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Stormwater Site Plan (Final-Accepted)
Stormwater Site Plan Transportation Center Site Improvements Yelm, WA May 2020 2 of 7 TABLE OF CONTENTS Stormwater Site Plan Cover Sheet ………………………………………………………………………………………………………………………………………..…1 Table of Contents ………….………………………………………………………………………………………………………………………2 Project Engineer’s Certification …..………………..………………………………………………………………………………………3 Section 1: Project Overview ……….…………………….………………………………………………………………………………….4 Section 2: Site Conditions ………………………….……………………………………………………………………………………….…5 Existing Site Conditions ………………….………………..………………………………………………………………………5 Soils Information …………..………………….………………………………………………………………………………………5 Section 3: Off-site Analysis Report …………………………………..……………………………………………………………………5 Section 4: Permanent Stormwater Control Plan …………………………..…………….…………………………………………5 Summary Section ……………………..……………………………………………………………………………………………5-6 Performance Standards and Goals ………………………………………..…………………………………………………6 Flow Control System …………………..………………………………………………………………………………………………6 Water Quality System …………………...……………….…………………………………………………………………………6 Section 5: Permits ……………………………..…………….……………………………………………………………..……………………7 Section 6: Construction Stormwater Pollution Prevention Plan ……………………….……………………………………7 Appendices Appendix 1: Design Calculations Appendix 2: TDA Exhibit Appendix 3: Geotechnical Memorandum Appendix 4: Mounding Analysis Report Appendix 5: Stormwater Pollution Prevention Plan Appendix 6: Operations & Maintenance Plan 3 of 7 PROJECT ENGINEER’S CERTIFICATION The technical material and data contained in these documents were prepared under the supervision and direction of the undersigned, whose seal, as a professional engineer to practice as such, is affixed below. 26 MAY 2020 Charlie Severs, PE Date Civil Engineering Manager 4 of 7 SECTION 1: PROJECT OVERVIEW This Stormwater Site Plan was prepared for the proposed bus parking expansion project that will be located at 202 Stevens Avenue NW, Yelm, WA 98597. The Stormwater Site Plan was prepared to comply with the minimum technical standards and requirements that are set forth in the 2012 Department of Ecology Stormwater Management Manual for Western Washington (SWMMWW) as amended in December 2014. The proposed parking lot expansion will be constructed Thurston Tax Parcel No. 22719310200. Specifically, the proposed site improvements / construction activities will include the following: Site preparation, grading, and erosion control activities Expansion of an impervious surface parking lot Construction of on-site stormwater facilities There are two Threshold Discharge Areas (TDAs); TDA 1 and TDA 2. The proposed project improvements for TDA 1 will result in more than 5,000 ft2 of new/replaced impervious surface area. According to the SWMMWW, Minimum Requirements 1-9 need to be addressed for TDA 1. The proposed project improvements for TDA 2 will result in less than 5,000 ft2 of new/replaced impervious surface area. According to the SWMMWW, Minimum Requirements 1-5 need to be addressed for TDA 2. MINIMUM REQUIREMENT COMPLIANCE WITH MINIMUM REQUIREMENT FOR TDA 1 #1 - Stormwater Site Plan The contents of this report and the enclosed plans are intended to satisfy this requirement. #2 - Construction SWPPP A Construction SWPPP has been prepared and is enclosed herein as an appendix. #3 - Source Control of Pollution If required, a Source Control Pollution Prevention Plan will be recorded against the property prior to certificate of occupancy. #4 - Drainage Path Preservation Preservation of the site’s previously established natural drainage paths will be maintained to the maximum extent practicable. #5 - Stormwater Management An on-site stormwater retention pond is proposed; the LID Performance Standard will be met. #6 - Runoff Treatment Basic treatment is required for this project. The expanded area of the proposed retention pond will be lined with compost amended soils. #7 - Flow Control The on-site stormwater retention pond will infiltrate 100% of on-site generated stormwater runoff. #8 - Wetlands Protection The proposed site improvements will not take place in previously established or delineated wetlands. #9 - Operation & Maintenance If required, an Agreement to Maintain Stormwater Facilities will be recorded against the property. An O&M Manual has been prepared. Table 1: Compliance with Minimum Technical Requirements for TDA 1 5 of 7 MINIMUM REQUIREMENT COMPLIANCE WITH MINIMUM REQUIREMENT FOR TDA 2 #1 - Stormwater Site Plan The contents of this report and the enclosed plans are intended to satisfy this requirement. #2 - Construction SWPPP A Construction SWPPP has been prepared and is enclosed herein as an appendix. #3 - Source Control of Pollution If required, a Source Control Pollution Prevention Plan will be recorded against the property prior to certificate of occupancy. #4 - Drainage Path Preservation Preservation of the site’s previously established natural drainage paths will be maintained to the maximum extent practicable. #5 - Stormwater Management Sheet flow dispersion is proposed. The increase for the 100-year storm peak flow event is less than 0.15 cfs. No additional requirements Table 2: Compliance with Minimum Technical Requirements for TDA 2 SECTION 2: SITE CONDITIONS Existing Site Conditions The existing parcel is occupied by the Yelm School District Transportation facility, which includes parking for school buses, and is approximately 7.76 acres in size. The proposed site improvements will disturb 10-15% of the lot area. The site, generally, slopes in a southwest-to-northeast direction. Yelm Creek runs adjacent to the north property line, which is delineated as a floodway in Thurston County’s GIS mapping. Proposed site improvements will not take place in the floodway area. The western portion of the site is vegetated with grass, and a small drainage swale extends from the existing pavement. The existing swale and below-grade infiltration gallery will remain after proposed site improvements are completed. Soils Information A geotechnical memorandum was finalized by Landau Associates on April 6, 2020. The field work was completed on March 19, 2020. Brown sand and gravel with cobbles were observed in the field test pits. The factor infiltration rate in the native recessional outwash was determined to be 1.6 to 3.8 inches/hour. 3 inches/hour was used to design the on-site stormwater facilities. The geotechnical memorandum is enclosed herein as an appendix. SECTION 3: OFF-SITE ANALYSIS AND REPORT On-site generated stormwater runoff from TDA 1 will be routed to an on-site stormwater retention pond; off-site discharge is not proposed. Stormwater runoff from TDA 2 will be dispersed in accordance with BMP T5.12 – Sheet Flow Dispersion. The net increase from the pre-developed to post-developed for the 100-year storm peak flow event will be less than 0.15 cfs. Historic off-site drainage courses will not be altered. Consequently, downstream impacts are not anticipated. SECTION 4: PERMANENT STORMWATER CONTROL PLAN Summary Section There is an existing on-site swale and below-grade retention gallery that treats and infiltrates on-site generated stormwater runoff from the existing bus transportation facility. Stormwater runoff from 6 of 7 proposed impervious surfaces will be routed to a separate infiltration facility (i.e., proposed infiltration pond). The following tables identify the different land-type designations for TDA 1 and TDA 2. LAND TYPE DESIGNATIONS FOR TDA 1 AREA (ACRES)% OF TOTAL AREA Threshold Discharge Area 0.63 100.0% Proposed Impervious Surface Area 0.63 100.0% Table 3: Land Type Designations Summary Table for TDA 1 LAND TYPE DESIGNATIONS FOR TDA 2 AREA (ACRES)% OF TOTAL AREA Threshold Discharge Area 0.10 100.0% Proposed Impervious Surface Area 0.10 100.0% Table 4: Land Type Designations Summary Table for TDA 2 Performance Standards and Goals The proposed site improvements will trigger Basic Treatment for TDA 1. In addition, the on-site stormwater retention pond will need to meet the LID performance standard and Ecology’s flow duration standard. TDA 2 will result in less than 5,000 ft2 of new/replaced impervious surfaces. The net increase from the pre-developed to post-developed for the 100-year storm peak flow event will be less than 0.15 cfs. BMP T5.12 – Sheet Flow Dispersion is proposed for the impervious surfaces that are associated with TDA 2. Treatment and flow control facilities are not required. Water Quality System According to Volume I, Section 2.5.6, of the SWMMWW, Basic Treatment is required for TDA 1. Infiltration through the vertical profile of a bioretention soil mix is an acceptable method to satisfy Minimum Requirement No. 6. The proposed infiltration pond will be lined with 18” of compost amended soils meeting the requirements of BMP T7.30. Flow Control System The proposed on-site stormwater infiltration pond has been designed in accordance with Volume III, Section 3.3, of the SWMMWW. Clear Creek’s 2012 Western Washington Hydrologic Modeling (WWHM) software was used for the design of the pond. An infiltration rate of 3 inches/hour was applied to the model. 1,300 ft2 is the minimum required bottom surface area that is needed in order to infiltrate 100% of the inflow runoff file; 1,320 ft2 will be provided. The effective pond depth is 3.5 feet. 0.5 feet of freeboard will be provided. Off-site discharge from TDA 1 is not proposed. The WWHM report is enclosed herein as an appendix. 7 of 7 SECTION 5: PERMITS Civil Plan Review approval will need to be provided by the City of Yelm prior to the release of project permits. SECTION 6: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN A Construction Stormwater Pollution Prevention Plan has been prepared in accordance with Volume II of the SWMMWW and is enclosed herein as an appendix. APPENDIX 1 DESIGN CALCULATIONS WWHM2012 PROJECT REPORT MAIN POND 4/8/2020 4:12:22 PM Page 2 General Model Information Project Name:MAIN POND Site Name: Site Address: City: Report Date:4/8/2020 Gage:Lake Lawrence Data Start:1955/10/01 Data End:2008/09/30 Timestep:15 Minute Precip Scale:0.857 Version Date:2018/10/10 Version:4.2.16 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year MAIN POND 4/8/2020 4:12:22 PM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre A B, Forest, Flat 0.63 Pervious Total 0.63 Impervious Land Use acre Impervious Total 0 Basin Total 0.63 Element Flows To: Surface Interflow Groundwater MAIN POND 4/8/2020 4:12:22 PM Page 4 Mitigated Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre PARKING FLAT 0.63 Impervious Total 0.63 Basin Total 0.63 Element Flows To: Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 MAIN POND 4/8/2020 4:12:22 PM Page 5 Routing Elements Predeveloped Routing MAIN POND 4/8/2020 4:12:22 PM Page 6 Mitigated Routing Trapezoidal Pond 1 Bottom Length:65.00 ft. Bottom Width:20.30 ft. Depth:4.5 ft. Volume at riser head:0.1592 acre-feet. Infiltration On Infiltration rate:3 Infiltration safety factor:1 Total Volume Infiltrated (ac-ft.):110.544 Total Volume Through Riser (ac-ft.):0 Total Volume Through Facility (ac-ft.):110.544 Percent Infiltrated:100 Total Precip Applied to Facility:0 Total Evap From Facility:0 Side slope 1:2 To 1 Side slope 2:2 To 1 Side slope 3:2 To 1 Side slope 4:2 To 1 Discharge Structure Riser Height:3.5 ft. Riser Diameter:12 in. Element Flows To: Outlet 1 Outlet 2 Pond Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.030 0.000 0.000 0.000 0.0500 0.030 0.001 0.000 0.091 0.1000 0.031 0.003 0.000 0.091 0.1500 0.031 0.004 0.000 0.091 0.2000 0.031 0.006 0.000 0.091 0.2500 0.032 0.007 0.000 0.091 0.3000 0.032 0.009 0.000 0.091 0.3500 0.033 0.011 0.000 0.091 0.4000 0.033 0.012 0.000 0.091 0.4500 0.033 0.014 0.000 0.091 0.5000 0.034 0.016 0.000 0.091 0.5500 0.034 0.017 0.000 0.091 0.6000 0.035 0.019 0.000 0.091 0.6500 0.035 0.021 0.000 0.091 0.7000 0.036 0.023 0.000 0.091 0.7500 0.036 0.025 0.000 0.091 0.8000 0.036 0.026 0.000 0.091 0.8500 0.037 0.028 0.000 0.091 0.9000 0.037 0.030 0.000 0.091 0.9500 0.038 0.032 0.000 0.091 1.0000 0.038 0.034 0.000 0.091 1.0500 0.038 0.036 0.000 0.091 1.1000 0.039 0.038 0.000 0.091 1.1500 0.039 0.040 0.000 0.091 1.2000 0.040 0.042 0.000 0.091 1.2500 0.040 0.044 0.000 0.091 1.3000 0.041 0.046 0.000 0.091 MAIN POND 4/8/2020 4:12:22 PM Page 7 1.3500 0.041 0.048 0.000 0.091 1.4000 0.042 0.050 0.000 0.091 1.4500 0.042 0.052 0.000 0.091 1.5000 0.042 0.054 0.000 0.091 1.5500 0.043 0.056 0.000 0.091 1.6000 0.043 0.059 0.000 0.091 1.6500 0.044 0.061 0.000 0.091 1.7000 0.044 0.063 0.000 0.091 1.7500 0.045 0.065 0.000 0.091 1.8000 0.045 0.067 0.000 0.091 1.8500 0.046 0.070 0.000 0.091 1.9000 0.046 0.072 0.000 0.091 1.9500 0.047 0.074 0.000 0.091 2.0000 0.047 0.077 0.000 0.091 2.0500 0.047 0.079 0.000 0.091 2.1000 0.048 0.082 0.000 0.091 2.1500 0.048 0.084 0.000 0.091 2.2000 0.049 0.086 0.000 0.091 2.2500 0.049 0.089 0.000 0.091 2.3000 0.050 0.091 0.000 0.091 2.3500 0.050 0.094 0.000 0.091 2.4000 0.051 0.097 0.000 0.091 2.4500 0.051 0.099 0.000 0.091 2.5000 0.052 0.102 0.000 0.091 2.5500 0.052 0.104 0.000 0.091 2.6000 0.053 0.107 0.000 0.091 2.6500 0.053 0.110 0.000 0.091 2.7000 0.054 0.112 0.000 0.091 2.7500 0.054 0.115 0.000 0.091 2.8000 0.055 0.118 0.000 0.091 2.8500 0.055 0.121 0.000 0.091 2.9000 0.056 0.123 0.000 0.091 2.9500 0.056 0.126 0.000 0.091 3.0000 0.057 0.129 0.000 0.091 3.0500 0.057 0.132 0.000 0.091 3.1000 0.058 0.135 0.000 0.091 3.1500 0.058 0.138 0.000 0.091 3.2000 0.059 0.141 0.000 0.091 3.2500 0.059 0.144 0.000 0.091 3.3000 0.060 0.147 0.000 0.091 3.3500 0.060 0.150 0.000 0.091 3.4000 0.061 0.153 0.000 0.091 3.4500 0.061 0.156 0.000 0.091 3.5000 0.062 0.159 0.000 0.091 3.5500 0.062 0.162 0.118 0.091 3.6000 0.063 0.165 0.333 0.091 3.6500 0.063 0.168 0.604 0.091 3.7000 0.064 0.171 0.907 0.091 3.7500 0.064 0.175 1.217 0.091 3.8000 0.065 0.178 1.509 0.091 3.8500 0.065 0.181 1.762 0.091 3.9000 0.066 0.185 1.960 0.091 3.9500 0.067 0.188 2.101 0.091 4.0000 0.067 0.191 2.203 0.091 4.0500 0.068 0.195 2.335 0.091 4.1000 0.068 0.198 2.439 0.091 4.1500 0.069 0.201 2.539 0.091 4.2000 0.069 0.205 2.635 0.091 MAIN POND 4/8/2020 4:12:23 PM Page 8 4.2500 0.070 0.208 2.727 0.091 4.3000 0.070 0.212 2.817 0.091 4.3500 0.071 0.216 2.903 0.091 4.4000 0.071 0.219 2.988 0.091 4.4500 0.072 0.223 3.069 0.091 4.5000 0.073 0.226 3.149 0.091 4.5500 0.073 0.230 3.227 0.091 MAIN POND 4/8/2020 4:12:23 PM Page 9 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.63 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.63 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000956 5 year 0.002652 10 year 0.004889 25 year 0.009984 50 year 0.016393 100 year 0.026222 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1956 0.003 0.000 1957 0.001 0.000 1958 0.001 0.000 1959 0.001 0.000 1960 0.001 0.000 1961 0.002 0.000 1962 0.000 0.000 1963 0.001 0.000 1964 0.001 0.000 1965 0.000 0.000 MAIN POND 4/8/2020 4:12:46 PM Page 10 1966 0.001 0.000 1967 0.001 0.000 1968 0.001 0.000 1969 0.001 0.000 1970 0.001 0.000 1971 0.004 0.000 1972 0.007 0.000 1973 0.000 0.000 1974 0.002 0.000 1975 0.001 0.000 1976 0.001 0.000 1977 0.000 0.000 1978 0.001 0.000 1979 0.000 0.000 1980 0.001 0.000 1981 0.001 0.000 1982 0.001 0.000 1983 0.001 0.000 1984 0.001 0.000 1985 0.000 0.000 1986 0.001 0.000 1987 0.001 0.000 1988 0.000 0.000 1989 0.000 0.000 1990 0.004 0.000 1991 0.005 0.000 1992 0.000 0.000 1993 0.000 0.000 1994 0.000 0.000 1995 0.003 0.000 1996 0.008 0.000 1997 0.005 0.000 1998 0.001 0.000 1999 0.000 0.000 2000 0.001 0.000 2001 0.000 0.000 2002 0.003 0.000 2003 0.000 0.000 2004 0.032 0.000 2005 0.005 0.000 2006 0.023 0.000 2007 0.010 0.000 2008 0.001 0.004 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0319 0.0045 2 0.0229 0.0000 3 0.0099 0.0000 4 0.0076 0.0000 5 0.0067 0.0000 6 0.0054 0.0000 7 0.0051 0.0000 8 0.0050 0.0000 9 0.0041 0.0000 10 0.0036 0.0000 11 0.0032 0.0000 MAIN POND 4/8/2020 4:12:46 PM Page 11 12 0.0031 0.0000 13 0.0031 0.0000 14 0.0023 0.0000 15 0.0017 0.0000 16 0.0013 0.0000 17 0.0012 0.0000 18 0.0012 0.0000 19 0.0012 0.0000 20 0.0011 0.0000 21 0.0008 0.0000 22 0.0007 0.0000 23 0.0007 0.0000 24 0.0007 0.0000 25 0.0005 0.0000 26 0.0005 0.0000 27 0.0005 0.0000 28 0.0005 0.0000 29 0.0005 0.0000 30 0.0005 0.0000 31 0.0005 0.0000 32 0.0005 0.0000 33 0.0005 0.0000 34 0.0005 0.0000 35 0.0005 0.0000 36 0.0005 0.0000 37 0.0005 0.0000 38 0.0005 0.0000 39 0.0005 0.0000 40 0.0005 0.0000 41 0.0005 0.0000 42 0.0005 0.0000 43 0.0005 0.0000 44 0.0005 0.0000 45 0.0005 0.0000 46 0.0005 0.0000 47 0.0005 0.0000 48 0.0005 0.0000 49 0.0005 0.0000 50 0.0005 0.0000 51 0.0005 0.0000 52 0.0005 0.0000 53 0.0004 0.0000 MAIN POND 4/8/2020 4:12:46 PM Page 12 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0005 685 3 0 Pass 0.0006 148 3 2 Pass 0.0008 120 3 2 Pass 0.0010 98 3 3 Pass 0.0011 80 3 3 Pass 0.0013 61 3 4 Pass 0.0014 51 3 5 Pass 0.0016 48 3 6 Pass 0.0018 44 2 4 Pass 0.0019 38 2 5 Pass 0.0021 37 2 5 Pass 0.0022 33 2 6 Pass 0.0024 32 2 6 Pass 0.0026 30 2 6 Pass 0.0027 29 2 6 Pass 0.0029 27 1 3 Pass 0.0031 26 1 3 Pass 0.0032 22 1 4 Pass 0.0034 19 1 5 Pass 0.0035 18 1 5 Pass 0.0037 16 1 6 Pass 0.0039 16 1 6 Pass 0.0040 14 1 7 Pass 0.0042 13 1 7 Pass 0.0043 11 1 9 Pass 0.0045 9 0 0 Pass 0.0047 9 0 0 Pass 0.0048 9 0 0 Pass 0.0050 9 0 0 Pass 0.0051 8 0 0 Pass 0.0053 6 0 0 Pass 0.0055 5 0 0 Pass 0.0056 5 0 0 Pass 0.0058 5 0 0 Pass 0.0059 5 0 0 Pass 0.0061 5 0 0 Pass 0.0063 5 0 0 Pass 0.0064 5 0 0 Pass 0.0066 5 0 0 Pass 0.0067 4 0 0 Pass 0.0069 4 0 0 Pass 0.0071 4 0 0 Pass 0.0072 4 0 0 Pass 0.0074 4 0 0 Pass 0.0076 4 0 0 Pass 0.0077 3 0 0 Pass 0.0079 3 0 0 Pass 0.0080 3 0 0 Pass 0.0082 3 0 0 Pass 0.0084 3 0 0 Pass 0.0085 3 0 0 Pass 0.0087 3 0 0 Pass 0.0088 3 0 0 Pass MAIN POND 4/8/2020 4:12:46 PM Page 13 0.0090 3 0 0 Pass 0.0092 3 0 0 Pass 0.0093 3 0 0 Pass 0.0095 3 0 0 Pass 0.0096 3 0 0 Pass 0.0098 3 0 0 Pass 0.0100 2 0 0 Pass 0.0101 2 0 0 Pass 0.0103 2 0 0 Pass 0.0104 2 0 0 Pass 0.0106 2 0 0 Pass 0.0108 2 0 0 Pass 0.0109 2 0 0 Pass 0.0111 2 0 0 Pass 0.0112 2 0 0 Pass 0.0114 2 0 0 Pass 0.0116 2 0 0 Pass 0.0117 2 0 0 Pass 0.0119 2 0 0 Pass 0.0121 2 0 0 Pass 0.0122 2 0 0 Pass 0.0124 2 0 0 Pass 0.0125 2 0 0 Pass 0.0127 2 0 0 Pass 0.0129 2 0 0 Pass 0.0130 2 0 0 Pass 0.0132 2 0 0 Pass 0.0133 2 0 0 Pass 0.0135 2 0 0 Pass 0.0137 2 0 0 Pass 0.0138 2 0 0 Pass 0.0140 2 0 0 Pass 0.0141 2 0 0 Pass 0.0143 2 0 0 Pass 0.0145 2 0 0 Pass 0.0146 2 0 0 Pass 0.0148 2 0 0 Pass 0.0149 2 0 0 Pass 0.0151 2 0 0 Pass 0.0153 2 0 0 Pass 0.0154 2 0 0 Pass 0.0156 2 0 0 Pass 0.0157 2 0 0 Pass 0.0159 2 0 0 Pass 0.0161 2 0 0 Pass 0.0162 2 0 0 Pass 0.0164 2 0 0 Pass MAIN POND 4/8/2020 4:12:46 PM Page 14 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. MAIN POND 4/8/2020 4:12:46 PM Page 15 LID Report MAIN POND 4/8/2020 4:12:52 PM Page 16 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. MAIN POND 4/8/2020 4:12:52 PM Page 17 Appendix Predeveloped Schematic MAIN POND 4/8/2020 4:12:53 PM Page 18 Mitigated Schematic MAIN POND 4/8/2020 4:12:53 PM Page 19 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2008 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 MAIN POND.wdm MESSU 25 PreMAIN POND.MES 27 PreMAIN POND.L61 28 PreMAIN POND.L62 30 POCMAIN POND1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 1 A/B, Forest, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 1 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 1 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO MAIN POND 4/8/2020 4:12:53 PM Page 20 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 1 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 1 0 5 2 400 0.05 0.3 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 1 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 1 0.2 0.5 0.35 0 0.7 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 1 0 0 0 0 3 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 MAIN POND 4/8/2020 4:12:53 PM Page 21 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 1 0.63 COPY 501 12 PERLND 1 0.63 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 0.857 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 0.857 IMPLND 1 999 EXTNL PREC MAIN POND 4/8/2020 4:12:53 PM Page 22 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN MAIN POND 4/8/2020 4:12:53 PM Page 23 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2008 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 MAIN POND.wdm MESSU 25 MitMAIN POND.MES 27 MitMAIN POND.L61 28 MitMAIN POND.L62 30 POCMAIN POND1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 IMPLND 11 RCHRES 1 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Trapezoidal Pond 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* END PRINT-INFO PWAT-PARM1 MAIN POND 4/8/2020 4:12:53 PM Page 24 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 MAIN POND 4/8/2020 4:12:53 PM Page 25 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** IMPLND 11 0.63 RCHRES 1 5 ******Routing****** IMPLND 11 0.63 COPY 1 15 RCHRES 1 1 COPY 501 17 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 Trapezoidal Pond-007 2 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 5 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS MAIN POND 4/8/2020 4:12:53 PM Page 26 FTABLES FTABLE 1 91 5 Depth Area Volume Outflow1 Outflow2 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.030292 0.000000 0.000000 0.000000 0.050000 0.030684 0.001524 0.000000 0.091632 0.100000 0.031079 0.003068 0.000000 0.091632 0.150000 0.031475 0.004632 0.000000 0.091632 0.200000 0.031873 0.006216 0.000000 0.091632 0.250000 0.032273 0.007820 0.000000 0.091632 0.300000 0.032674 0.009443 0.000000 0.091632 0.350000 0.033078 0.011087 0.000000 0.091632 0.400000 0.033483 0.012751 0.000000 0.091632 0.450000 0.033891 0.014436 0.000000 0.091632 0.500000 0.034300 0.016140 0.000000 0.091632 0.550000 0.034711 0.017866 0.000000 0.091632 0.600000 0.035124 0.019611 0.000000 0.091632 0.650000 0.035538 0.021378 0.000000 0.091632 0.700000 0.035955 0.023165 0.000000 0.091632 0.750000 0.036373 0.024973 0.000000 0.091632 0.800000 0.036793 0.026803 0.000000 0.091632 0.850000 0.037215 0.028653 0.000000 0.091632 0.900000 0.037639 0.030524 0.000000 0.091632 0.950000 0.038064 0.032417 0.000000 0.091632 1.000000 0.038492 0.034331 0.000000 0.091632 1.050000 0.038921 0.036266 0.000000 0.091632 1.100000 0.039352 0.038223 0.000000 0.091632 1.150000 0.039785 0.040201 0.000000 0.091632 1.200000 0.040220 0.042201 0.000000 0.091632 1.250000 0.040657 0.044223 0.000000 0.091632 1.300000 0.041095 0.046267 0.000000 0.091632 1.350000 0.041535 0.048333 0.000000 0.091632 1.400000 0.041978 0.050421 0.000000 0.091632 1.450000 0.042421 0.052531 0.000000 0.091632 1.500000 0.042867 0.054663 0.000000 0.091632 1.550000 0.043315 0.056817 0.000000 0.091632 1.600000 0.043764 0.058994 0.000000 0.091632 1.650000 0.044216 0.061194 0.000000 0.091632 1.700000 0.044669 0.063416 0.000000 0.091632 1.750000 0.045124 0.065661 0.000000 0.091632 1.800000 0.045581 0.067928 0.000000 0.091632 1.850000 0.046039 0.070219 0.000000 0.091632 1.900000 0.046500 0.072532 0.000000 0.091632 1.950000 0.046962 0.074869 0.000000 0.091632 2.000000 0.047427 0.077229 0.000000 0.091632 2.050000 0.047893 0.079612 0.000000 0.091632 2.100000 0.048360 0.082018 0.000000 0.091632 2.150000 0.048830 0.084448 0.000000 0.091632 2.200000 0.049302 0.086901 0.000000 0.091632 2.250000 0.049775 0.089378 0.000000 0.091632 2.300000 0.050250 0.091879 0.000000 0.091632 2.350000 0.050727 0.094403 0.000000 0.091632 2.400000 0.051206 0.096951 0.000000 0.091632 2.450000 0.051687 0.099524 0.000000 0.091632 2.500000 0.052169 0.102120 0.000000 0.091632 2.550000 0.052654 0.104741 0.000000 0.091632 2.600000 0.053140 0.107385 0.000000 0.091632 2.650000 0.053628 0.110055 0.000000 0.091632 2.700000 0.054118 0.112748 0.000000 0.091632 2.750000 0.054610 0.115467 0.000000 0.091632 2.800000 0.055103 0.118209 0.000000 0.091632 2.850000 0.055599 0.120977 0.000000 0.091632 2.900000 0.056096 0.123769 0.000000 0.091632 2.950000 0.056595 0.126587 0.000000 0.091632 3.000000 0.057096 0.129429 0.000000 0.091632 3.050000 0.057599 0.132296 0.000000 0.091632 3.100000 0.058103 0.135189 0.000000 0.091632 3.150000 0.058610 0.138107 0.000000 0.091632 3.200000 0.059118 0.141050 0.000000 0.091632 MAIN POND 4/8/2020 4:12:53 PM Page 27 3.250000 0.059628 0.144018 0.000000 0.091632 3.300000 0.060140 0.147013 0.000000 0.091632 3.350000 0.060654 0.150032 0.000000 0.091632 3.400000 0.061169 0.153078 0.000000 0.091632 3.450000 0.061687 0.156149 0.000000 0.091632 3.500000 0.062206 0.159247 0.000000 0.091632 3.550000 0.062727 0.162370 0.118483 0.091632 3.600000 0.063250 0.165520 0.333520 0.091632 3.650000 0.063775 0.168695 0.604786 0.091632 3.700000 0.064302 0.171897 0.907676 0.091632 3.750000 0.064830 0.175125 1.217555 0.091632 3.800000 0.065360 0.178380 1.509672 0.091632 3.850000 0.065893 0.181661 1.762076 0.091632 3.900000 0.066427 0.184969 1.960035 0.091632 3.950000 0.066962 0.188304 2.101488 0.091632 4.000000 0.067500 0.191666 2.203335 0.091632 4.050000 0.068039 0.195054 2.335828 0.091632 4.100000 0.068581 0.198470 2.439693 0.091632 4.150000 0.069124 0.201912 2.539313 0.091632 4.200000 0.069669 0.205382 2.635170 0.091632 4.250000 0.070216 0.208879 2.727660 0.091632 4.300000 0.070764 0.212404 2.817115 0.091632 4.350000 0.071315 0.215956 2.903815 0.091632 4.400000 0.071867 0.219535 2.988001 0.091632 4.450000 0.072421 0.223143 3.069880 0.091632 4.500000 0.072978 0.226778 3.149630 0.091632 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 0.857 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 0.857 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR O 1 1 1 WDM 1001 FLOW ENGL REPL RCHRES 1 HYDR O 2 1 1 WDM 1002 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1003 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 17 RCHRES OFLOW OVOL 1 COPY INPUT MEAN END MASS-LINK 17 END MASS-LINK END RUN MAIN POND 4/8/2020 4:12:53 PM Page 28 Predeveloped HSPF Message File MAIN POND 4/8/2020 4:12:53 PM Page 29 Mitigated HSPF Message File MAIN POND 4/8/2020 4:12:53 PM Page 30 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2020; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com WWHM2012 PROJECT REPORT default 4/9/2020 8:25:51 AM Page 2 General Model Information Project Name:default Site Name: Site Address: City: Report Date:4/9/2020 Gage:Lake Lawrence Data Start:1955/10/01 Data End:2008/09/30 Timestep:15 Minute Precip Scale:0.857 Version Date:2018/10/10 Version:4.2.16 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year default 4/9/2020 8:25:51 AM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre A B, Forest, Flat 0.1 Pervious Total 0.1 Impervious Land Use acre Impervious Total 0 Basin Total 0.1 Element Flows To: Surface Interflow Groundwater default 4/9/2020 8:25:51 AM Page 4 Mitigated Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre PARKING FLAT 0.1 Impervious Total 0.1 Basin Total 0.1 Element Flows To: Surface Interflow Groundwater default 4/9/2020 8:25:51 AM Page 5 Routing Elements Predeveloped Routing default 4/9/2020 8:25:51 AM Page 6 Mitigated Routing default 4/9/2020 8:25:51 AM Page 7 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.1 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.1 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000152 5 year 0.000421 10 year 0.000776 25 year 0.001585 50 year 0.002602 100 year 0.004162 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.041701 5 year 0.056654 10 year 0.067623 25 year 0.082749 50 year 0.094969 100 year 0.108033 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1956 0.000 0.032 1957 0.000 0.059 1958 0.000 0.042 1959 0.000 0.040 1960 0.000 0.057 1961 0.000 0.029 1962 0.000 0.032 1963 0.000 0.056 1964 0.000 0.040 1965 0.000 0.041 default 4/9/2020 8:26:14 AM Page 8 1966 0.000 0.035 1967 0.000 0.039 1968 0.000 0.026 1969 0.000 0.027 1970 0.000 0.032 1971 0.001 0.030 1972 0.001 0.037 1973 0.000 0.031 1974 0.000 0.063 1975 0.000 0.043 1976 0.000 0.036 1977 0.000 0.053 1978 0.000 0.042 1979 0.000 0.056 1980 0.000 0.032 1981 0.000 0.051 1982 0.000 0.043 1983 0.000 0.075 1984 0.000 0.040 1985 0.000 0.038 1986 0.000 0.052 1987 0.000 0.037 1988 0.000 0.022 1989 0.000 0.028 1990 0.001 0.101 1991 0.001 0.052 1992 0.000 0.041 1993 0.000 0.024 1994 0.000 0.036 1995 0.000 0.055 1996 0.001 0.049 1997 0.001 0.043 1998 0.000 0.064 1999 0.000 0.036 2000 0.000 0.042 2001 0.000 0.038 2002 0.001 0.043 2003 0.000 0.030 2004 0.005 0.095 2005 0.001 0.111 2006 0.004 0.058 2007 0.002 0.047 2008 0.000 0.058 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0051 0.1113 2 0.0036 0.1010 3 0.0016 0.0953 4 0.0012 0.0748 5 0.0011 0.0644 6 0.0009 0.0631 7 0.0008 0.0586 8 0.0008 0.0584 9 0.0007 0.0579 10 0.0006 0.0575 11 0.0005 0.0559 default 4/9/2020 8:26:14 AM Page 9 12 0.0005 0.0558 13 0.0005 0.0555 14 0.0004 0.0525 15 0.0003 0.0523 16 0.0002 0.0519 17 0.0002 0.0512 18 0.0002 0.0485 19 0.0002 0.0468 20 0.0002 0.0430 21 0.0001 0.0426 22 0.0001 0.0426 23 0.0001 0.0426 24 0.0001 0.0425 25 0.0001 0.0422 26 0.0001 0.0419 27 0.0001 0.0410 28 0.0001 0.0409 29 0.0001 0.0404 30 0.0001 0.0402 31 0.0001 0.0398 32 0.0001 0.0391 33 0.0001 0.0377 34 0.0001 0.0377 35 0.0001 0.0374 36 0.0001 0.0373 37 0.0001 0.0365 38 0.0001 0.0364 39 0.0001 0.0363 40 0.0001 0.0346 41 0.0001 0.0324 42 0.0001 0.0321 43 0.0001 0.0320 44 0.0001 0.0317 45 0.0001 0.0312 46 0.0001 0.0301 47 0.0001 0.0301 48 0.0001 0.0294 49 0.0001 0.0276 50 0.0001 0.0271 51 0.0001 0.0258 52 0.0001 0.0244 53 0.0001 0.0218 default 4/9/2020 8:26:14 AM Page 13 LID Report default 4/9/2020 8:26:21 AM Page 14 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. default 4/9/2020 8:26:21 AM Page 15 Appendix Predeveloped Schematic default 4/9/2020 8:26:21 AM Page 16 Mitigated Schematic default 4/9/2020 8:26:22 AM Page 17 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2008 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 default.wdm MESSU 25 Predefault.MES 27 Predefault.L61 28 Predefault.L62 30 POCdefault1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 1 A/B, Forest, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 1 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 1 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO default 4/9/2020 8:26:22 AM Page 18 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 1 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 1 0 5 2 400 0.05 0.3 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 1 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 1 0.2 0.5 0.35 0 0.7 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 1 0 0 0 0 3 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 default 4/9/2020 8:26:22 AM Page 19 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 1 0.1 COPY 501 12 PERLND 1 0.1 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 0.857 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 0.857 IMPLND 1 999 EXTNL PREC default 4/9/2020 8:26:22 AM Page 20 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN default 4/9/2020 8:26:22 AM Page 21 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2008 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 default.wdm MESSU 25 Mitdefault.MES 27 Mitdefault.L61 28 Mitdefault.L62 30 POCdefault1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 IMPLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** default 4/9/2020 8:26:22 AM Page 22 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND default 4/9/2020 8:26:22 AM Page 23 SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** IMPLND 11 0.1 COPY 501 15 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 0.857 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 0.857 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP default 4/9/2020 8:26:22 AM Page 24 END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 END MASS-LINK END RUN default 4/9/2020 8:26:22 AM Page 25 Predeveloped HSPF Message File default 4/9/2020 8:26:22 AM Page 26 Mitigated HSPF Message File default 4/9/2020 8:26:22 AM Page 27 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. 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Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com APPENDIX 2 TDA EXHIBIT STEVENS AVE NE1ST ST NESCALE IN FEET03060STREET ADDRESSPARCEL NUMBERJOB No.: 2218.05DRAWING FILE No.: _2018.05 TDA 1 & 2DATE: APRIL, 2020HORIZONTAL SCALE: 1" = 30'EXHIBIT No: EX-01SHEET No: 1 of 1212 N TOWER AVE, CENTRALIA, WA 98531P: 360.669.0700 F: 360.352.1509SCJALLIANCE.COMTHRESHOLD DISCHARGE AREA APPENDIX 3 GEOTECHNICAL MEMORANDUM Draft Technical Memorandum 955 Malin Lane SW, Suite B • Tumwater, Washington 98501 • (360) 791-3178 TO: Mr. Charlie Severs, PE, SCJ Alliance FROM: Lance Levine, PE, and Calvin McCaughan, PE DATE: April 6, 2020 RE: Summary of Geotechnical Engineering Services Yelm Community Schools Transportation Center Improvements Yelm, Washington Project No. 1773003.010.011 Introduction This memorandum summarizes the results of geotechnical engineering services provided by Landau Associates, Inc. (LAI) in support of the Yelm Community Schools Tr ansportation Center Improvements project. Yelm Community Schools (District; project owner) proposes to expand transportation facilities located at 202 Northwest Stevens Avenue in Yelm, Washington (site; Figure 1). Geotechnical services were provided in accordance with the scope outlined in LAI’s February 26, 2020 proposal. This memorandum was prepared with information provided by representatives of SCJ Alliance (project civil engineer) and with data collected during LAI’s geologic review, field investigatio n, and geotechnical laboratory testing. Project Understanding The District proposes to expand existing bus-parking facilities in the western portion of the site. LAI understands that approximately 30,000 square feet (sf) of pavement will be added to the west of existing pavement. The addition of impervious pavement will result in increased stormwater runoff, and an 850-sf stormwater pond will be installed to manage runoff. In 2010, LAI performed a groundwater mounding analysis to support installation of a stormwater pond in the western portion of the site. In 2020, the District proposed to expand the stormwater pond, and LAI completed a second groundwater mounding analysis. Results of the 2020 analysis indicate that less than 0.5 feet (ft) of groundwater mounding will occur along the boundaries of neighboring properties. This technical memorandum includes design infiltration rates for the proposed infiltration facility. Site C onditions and Geologic Setting The 8.78-acre site is developed with a transportation center ; only the western portion of the site can accommodate the proposed expansion. The site is mostly flat ; at its northern boundary, the site slopes gently toward Yelm Creek. The western portion of the site is vegetated with grass , and a small drainage swale extends from existing pavement. DRAFT Landau Associates Summary of Geotechnical Engineering Services YCS Transportation Center Improvements 2 April 6, 2020 Geologic information for the site was obtained from the Geologic Map of the Centralia Quadrangle, Washington (Schasse 1987). Subsurface deposits in the vicinity of the site are mapped as Vashon age recessional outwash gravel (Qdvg). This unit typically consists of medium dense to dense, proglacial and recessional, stratified sand, gravel, cobbles, and boulders deposited in meltwat er streams and deltas. The native soils and locally derived fill material observed during LAI’s March 2020 field investigation were consistent with outwash gravel. Subsurface Explorations Site subsurface conditions were explored on March 19, 2020 by excavating five test pits (TP -1 through TP-5) at the approximate locations shown on Figure 2. Test pits were excavated 4.0 to 10.0 ft below ground surface (bgs). The District provided the backhoe and operator. LAI personnel monitored the explorations, collected representative soil samples, and maintained a detailed record of the subsurface soil and groundwater conditions observed. Each representative soil type was described using the soil classification system shown on Figure 3. Summary logs of the test pit explorations are provided on Figures 4 through 6. Samples were transported to LAI’s soils laboratory for further examination and testing. To evaluate the composition of fine-grained site soils, select samples were analyzed in accordance with ASTM International (ASTM) standard test method s D2216 and D422. Test results are presented on Figures 7 and 8. Soil Conditions The soils observed underlying existing surface conditions (i.e., 6 to 8 inches of sod and topsoil) can be categorized into two units: Fill: Fill material was observed in test pits TP -2, TP-4, and TP-5, and extended from ground surface to approximately 5 ft bgs. The fill was in a medium dense condition, and appeared to consist of locally derived recessional outwash (brown to dark brown sand and gravel with variable silt and cobbles) with demolition debris (concrete, rebar, and wood pieces). Caving occurred in test pits TP -4 and TP-5. Recessional Outwash: Recessional outwash was observed beneath the sod/topsoil or fill material in test pits TP -1 through TP-3. The recessional outwash typically consisted of brown to dark brown sand and gravel with variable silt, cobble, and boulder content. Test pits TP-1 through TP-3 terminated in this unit. Cobbles and boulders were observed in the test pits. The contractor should be prepared to manage such oversized material. DRAFT Landau Associates Summary of Geotechnical Engineering Services YCS Transportation Center Improvements 3 April 6, 2020 Groundwater Conditions During LAI’s March 2020 field investigation, groundwater was observed at 9 ft bgs in test pit TP -2. The groundwater conditions reported herein are for the specific locations and date indicated, and may not be representative of other locations and/or times. Groundwater conditions will vary with local subsurface conditions, weat her conditions, and other factors. Furthermore, groundwater levels are expected to fluctuate seasonally, with maximum groundwater levels occurring during late winter and early spring. Conclusions and Recommendations Site subsurface conditions generally consist of sand and gravel with minor silt, cobble, and boulder content, and are considered suitable for stormwater infiltration and pavement support. Infiltration facilities should not be installed in fill soils or in soils with a high silt content. Pavemen t Design Pavement sections should be constructed on a uniformly firm, unyielding subgrade that consists of 1 ft of recompacted native soil or import structural fill. When preparing the pavement design recommendations in Table 1, LAI assumed a 20 -year design life and maximum equivalent single -axle load (ESAL) of 500,000 for the standard-duty pavement section . A 20-year design life and maximum ESAL of 5,000,000 were assumed for the heavy-duty pavement section. Table 1. Recommended Asphalt Pavement Design Sect ion Pavement Section Type Asphalt Pavement Thickness (inches) Crushed Surfacing Thickness (inches) Standard duty 2 6 Heavy duty 3 8 Base course material should be compacted to at least 95 percent of the maximum dry density (determined in accordance with ASTM standard test method D1557), and should meet the requirements for Crushed Surfacing Base Course in Section 9 -03.9(3) of the Washington State Department of Transportation’s 2020 Standard Specifications for Road, Bridge, an d Municipal Construction (2020 WSDOT Standard Specifications ). To facilitate fine grading of the surface, the upper 2 inches of crushed surfacing could consist of Crushed Surfacing Top Course. Prevention of road base saturation is essential for pavement du rability, and efforts should be made to limit the amount of water entering the base course. Asphalt concrete should be Class B aggregate material or hot -mix asphalt class ½ inch and PG58H -22 binder conforming to the requirements in Section 5 -04 of the 2020 WSDOT Standard Specifications. Asphalt should be compacted to at least 91 percent of the Rice density. DRAFT Landau Associates Summary of Geotechnical Engineering Services YCS Transportation Center Improvements 4 April 6, 2020 Stormwater Infiltration Site soils consist of sand and gravel with variable silt content and a low to moderate infiltration rate. Based on the subsurfac e conditions observed in LAI’s explorations, onsite stormwater infiltration is feasible. The long-term infiltration rates in Table 2 are based on the results of LAI’s geotechnical laboratory tests (Figures 7 and 8), and were calculated using the methods and recommended correction factors in Section V -5.4 of the Washington State Department of E cology’s 2019 Stormwater Management Manual for Western Washington. The correction factors were used to account for site variability (CFv=0.8), testing method (CFt=0.4), and buildup prevention (CFm=0.9). When calculating the infiltration rates, LAI assumed a ponded water depth of 1 ft and a depth to groundwater of 5 ft , measured from the base of the infiltration facility . These assumptions should be verified during final design. Table 2. Design Infiltration Rates Exploration Depth Interval (ft) Material Factored Infiltration Rate (in/hr) TP-1 0.5–8.5 Native Outwash 1.6 TP-2 0.5–5 Fill 1.6 TP-2 5–9 Native Outwash 0.07 TP-2 9–10 Native Outwash 0.05 TP-3 0.5–8 Native Outwash 3.8 TP-3 8–9.5 Native Outwash 2.7 TP-4 0.5–4 Fill 0.6 ft = feet in/hr = inches per hour TP = test pit Site Work The following key points should be reviewed during development of design specifications: Stripping: Sod and organic topsoil are present throughout the site, and extend approximately 8 inches bgs. LAI recommends s tripping the sod and topsoil from beneath all planned pavement areas. An average stripping depth of 10 inches should be assumed. Stripped material is not suitable for reuse as structural fill, but can be stockpiled and used in landscaped areas. DRAFT Landau Associates Summary of Geotechnical Engineering Services YCS Transportation Center Improvements 5 April 6, 2020 Pavement subgrade preparation: Before structural fill is placed, the subgrade should be evaluated by a geotechnical engineer. Accessible subgrades should be proof -rolled; areas of limited access can be evaluated using a steel T -probe. If probing or proof -rolling reveals loose and/or disturbed subgrades, the upper 1 ft of subgrade should be moisture conditioned and compacted to a firm, unyielding condition, or overexcavated and replaced with compacted structural fill. Site utilities: Site soils are expected to provide adequate foundation support for new stormwater utility lines. Unsuitable soil should be overexcavated and replaced with crushed, processed, or naturally occurring granular material. The material should meet the gradation requirements for Gravel Backfil l for Pipe Zone Bedding in Section 9 -03.12(3) of the 2020 WSDOT Standard Specifications. Structural fill should be placed in 6 -inch lifts, and mechanically compacted to provide a firm trench bottom. Site soils: Fine-grained, moisture-sensitive soil was obs erved in test pits TP -2, TP-4, and TP-5. If granular native soils are reused as structural fill, the soils should be moisture conditioned and screened for constituents greater than 6 inches in diameter. In LAI’s opinion, large -scale reuse of native soils is impractical, as preparation could delay the project schedule. Import structural fill: Gravel Borrow, as described in Section 9 -03.14(1) of the 2020 WSDOT Standard Specifications, is a suitable source of import structural fill. During periods of wet weather, the fines content should not exceed 5 percent, based on the minus ¾-inch fraction. Fill placement and compaction: Structural fill should be placed on an approved subgrade that consists of uniformly firm, unyielding, inorganic native soil, or on compa cted structural fill extending to such soils. Structural fill should be placed and compacted in accordance with Section 2-03.3(14)C, Method C of the 2020 WSDOT Standard Specifications. Method A is appropriate for non-structural areas, such as landscaping. Each layer of structural fill should be compacted to at least 95 percent of the maximum dry density, as determined using the compaction control tests in Section 2 -03.3(14)D of the 2020 WSDOT Standard Specifications. Alternatively, maximum density can be de termined using ASTM standard test method D1557. Construction dewatering: Perched groundwater zones could be encountered during the wet season, and construction dewatering may be required. LAI recommends dewatering temporary excavations to allow constructio n to be completed in the dry. Where groundwater seepage is encountered, use of conventional sumps and pumps should be sufficient. The contractor should be responsible for the design, monitoring, and maintenance of dewatering system(s). Temporary slopes: Temporary excavations should be completed in accordance with Section 2 - 09 of the 2020 WSDOT Standard Specifications. The contractor should be responsible for actual excavation configurations and the maintenance of safe working conditions, including temporary excavation stability. Temporary excavations in excess of 4 ft should be shored or sloped in accordance with the requirements outlined in Safety Standards for Construction Work, Part N (Washington Administrative Code Chapter 296 -155). The soil likely to be exposed in the excavations should be considered Type C with a maximum allowable excavation inclination of 1½ horizontal to 1 vertical (1½H:1V). All applicable local, state, and federal safety codes should be followed. DRAFT Landau Associates Summary of Geotechnical Engineering Services YCS Transportation Center Improvements 6 April 6, 2020 Permanent slopes: Permanent cut and fill slopes should be no steeper than 2H:1V. This design recommendation does not apply to stormwater pond slopes, which are typically 3H:1V or flatter. Stormwater pond slopes should be designed in accordance with local stormwater codes. Permanent and tempo rary slopes should be protected from erosion and reseeded or revegetated as soon as practical. Obstructions: Cobbles and boulders were observed in LAI’s subsurface explorations . The contractor should be prepared to encounter cobbles and boulders in the exc avations. Construction Support Services LAI should review the project plans and specifications to verify that geotechnical recommendations have been properly interpreted and implemented. Monitoring, testing, and consultation should be provided during const ruction to confirm that site conditions are consistent with those observed in LAI’s explorations, and to provide expedient recommendations should conditions differ from those anticipated. Construction monitoring activities would include compaction testing of structural fill and evaluation of subgrade preparation. LAI would be pleased to provide construction monitoring services. Use of This Technical Memorandum Landau Associates, Inc. (LAI) has prepared this technical memorandum for the exclusive use of Yelm Community Schools, SCJ Alliance, and the project design team for specific application to the Yelm Community Schools Transportation Center Improvements project in Yelm, Washington. No other party is entitled to rely on the information, conclusions, and rec ommendations included in this document without the express written consent of LAI. Reuse of the information, conclusions, and recommendations provided herein for extensions of the project or for any other project, without review and authorization by LAI, s hall be at the user’s sole risk. LAI warrants that, within the limitations of scope, schedule, and budget, its services have been provided in a manner consistent with that level of skill and care ordinarily exercised by members of the profession currently practicing in the same locality under similar conditions as this project. LAI makes no other warranty, either express or implied. DRAFT Landau Associates Summary of Geotechnical Engineering Services YCS Transportation Center Improvements 7 April 6, 2020 Closing We trust that this memorandum provides you with sufficient information to proceed with the project. If you have questions or comments, please contact the undersigned at (360) 791-3178. LANDAU ASSOCIATES, INC. Lance Levine, PE Senior Project Engineer Calvin McCaughan, PE Principal LGL/CAM/mcs [\\OLYMPIA1\PROJECTS\1773\003.010\R\YCS TRANSPORTATION CENTER IMPROVEMENTS DRAFT TECHNICAL MEMORANDUM.DOCX] Attachments: Figure 1. Vicinity Map Figure 2. Site and Exploration Location Plan Figure 3. Soil Classification System and Key Figures 4–6. Logs of Test Pits TP-1 through TP-5 Figures 7 and 8. Grain Size Distribution References ASTM. 2017. Annual Book of ASTM Standards. In: Soil and Rock (I). West Conshohocken, PA: ASTM International. Ecology. 2019. Stormwater Management Manual for Western Washington. Olympia, Washington: Washington State Department of Ecology. Schasse, H.W. 1987. Geologic Map of the Centralia Quadrangle, Washington. Washington State Department of Natural Resources. Washington State Department of Labor and Industries. 2016. Construction Work. Chapter 296-155 WAC; Part N. Excavation, Trenching, and Shoring. Washington State Department of Labor and Industries. May 20. WSDOT. 2019. M41-10: Standard Specifications for Road, Bridge, and Municipal Construction. 2020 Edition. Washington State Department of Transportation. September 1. ST510 ST507 1St St SBald Hill Rd SE E Yelm AveYelm Hwy SE3Rd St NEMill Rd SECoates Rd SE SE 103Rd Ave Clark Rd SEMorris Rd SEHarris Rd SERhoton Rd SEKillion Rd SE93 Rd Ave SE Canal Rd SECullens Rd SENorthern Pacific Rd SEYe l m H i g hSchool Fo r t L e w i s F i v e C o r n e rsFive C o r n e rs Fo u r C o r n e r sFour C o r n e r s N o r t h Ye l mNorth Ye l m Ye l mYelm Data Source: Esri 2012Yelm Community S choolsTransportation Center ImprovementsYelm, Washington Vicinity Map Figure1 0 0.5 1 Miles G:\Projects\1773\003\010\011\F01VicMap.mxd 4/1/2020 Project Location ! ! ! ! !! ! W a s h i n g t o nWashington Olympia Tacoma Spokane EverettSeattle ProjectLocation ")Ò ")Ò ")Ò ")Ò ")Ò Edwards St NWStevens St NW Transportation Center TP-1 TP-2 TP-4 TP-5 TP-3 Yelm Community SchoolsTransportation CenterImprovementsYelm, Washington Site and ExplorationLocation Plan Figure2 Note1. Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. Legend ")Ò Test Pit Location and Designation Approximate Limit of Fill Water Quality and Flow Control Facility Extent of Pavement G:\Projects\1773\003\010\011\F02_S&Eplan.mxd 4/3/2020 0 80 160 Scale in Feet 3 Yelm Community Schools Transportation Center Improvements Yelm, Washington 1 Approximate water level at time after drilling/excavation/well AC or PC CLEAN SAND FINE-GRAINED SOILPT OH CH Well-graded gravel; gravel/sand mixture(s); little or no fines MH OL CL ML SC Field and Lab Test Data Soil Classification System SM SP(Little or no fines)(More than 50% of material is smaller than No. 200 sieve size)Silty gravel; gravel/sand/silt mixture(s) Silty sand; sand/silt mixture(s) Clayey sand; sand/clay mixture(s) Inorganic silt and very fine sand; rock flour; silty or clayey finesand or clayey silt with slight plasticity Inorganic clay of low to medium plasticity; gravelly clay; sandyclay; silty clay; lean clay Organic silt; organic, silty clay of low plasticity Inorganic silt; micaceous or diatomaceous fine sand Inorganic clay of high plasticity; fat clay Organic clay of medium to high plasticity; organic silt MAJOR DIVISIONS Pocket Penetrometer, tsf Torvane, tsf Photoionization Detector VOC screening, ppm Moisture Content, % Dry Density, pcf Material smaller than No. 200 sieve, % Grain Size - See separate figure for data Atterberg Limits - See separate figure for data Other Geotechnical Testing Chemical Analysis PP = 1.0 TV = 0.5 PID = 100 W = 10 D = 120 -200 = 60 GS AL GT CA Groundwater Code SAMPLER TYPE Code Description SW GC Sample Depth Interval Recovery Depth Interval Sample Identification Number SAMPLE NUMBER & INTERVAL TYPICAL DESCRIPTIONS (2)(3) Asphalt concrete pavement or Portland cement pavement USCS LETTER SYMBOL(1) Approximate water level at time of drilling (ATD) a b c d e f g h i 1 2 3 4 5 Clayey gravel; gravel/sand/clay mixture(s) GRAPHIC SYMBOL Drilling and Sampling Key Description Portion of Sample Retained for Archive or Analysis GM GP GW Poorly graded gravel; gravel/sand mixture(s); little or no fines Well-graded sand; gravelly sand; little or no fines Poorly graded sand; gravelly sand; little or no fines Peat; humus; swamp soil with high organic content CLEAN GRAVELGRAVEL AND GRAVELLY SOIL (Appreciable amount of fines) GRAVEL WITH FINES (Little or no fines) (More than 50% of coarse fraction passed through No. 4 sieve) SAND AND SANDY SOIL COARSE-GRAINED SOIL(More than 50% of coarse fraction retained on No. 4 sieve) 3.25-inch O.D., 2.42-inch I.D. Split Spoon 2.00-inch O.D., 1.50-inch I.D. Split Spoon Shelby Tube Grab Sample Single-Tube Core Barrel Double-Tube Core Barrel 2.50-inch O.D., 2.00-inch I.D. WSDOT 3.00-inch O.D., 2.375-inch I.D. Mod. California Other - See text if applicable 300-lb Hammer, 30-inch Drop 140-lb Hammer, 30-inch Drop Pushed Vibrocore (Rotosonic/Geoprobe) Other - See text if applicable(More than 50% of material islarger than No. 200 sieve size)SAND WITH FINES (Appreciable amount of fines) HIGHLY ORGANIC SOIL (Liquid limit greater than 50) SILT AND CLAY RK DB Rock (See Rock Classification) (Liquid limit less than 50) SILT AND CLAY Wood, lumber, wood chips GRAPHIC SYMBOL Construction debris, garbage PAVEMENT ROCK WOOD DEBRIS OTHER MATERIALS TYPICAL DESCRIPTIONS LETTER SYMBOL WD > 30% and < > 15% and < > 5% and < < > _ _ _ _ Primary Constituent: Secondary Constituents: Additional Constituents: Notes: 1. USCS letter symbols correspond to symbols used by the Unified Soil Classification System and ASTM classification methods. Dual letter symbols (e.g., SP-SM for sand or gravel) indicate soil with an estimated 5-15% fines. Multiple letter symbols (e.g., ML/CL) indicate borderline or multiple soil classifications. 2. Soil descriptions are based on the general approach presented in the Standard Practice for Description and Identification of Soils (Visual-Manual Procedure), outlined in ASTM D 2488. Where laboratory index testing has been conducted, soil classifications are based on the Standard Test Method for Classification of Soils for Engineering Purposes, as outlined in ASTM D 2487. 3. Soil description terminology is based on visual estimates (in the absence of laboratory test data) of the percentages of each soil type and is defined as follows: 4. Soil density or consistency descriptions are based on judgement using a combination of sampler penetration blow counts, drilling or excavating conditions, field tests, and laboratory tests, as appropriate. 50% - "GRAVEL," "SAND," "SILT," "CLAY," etc. 50% - "very gravelly," "very sandy," "very silty," etc. 30% - "gravelly," "sandy," "silty," etc. 15% - "with gravel," "with sand," "with silt," etc. 5% - "with trace gravel," "with trace sand," "with trace silt," etc., or not noted. Soil Classification System and Key Figure DRAFTd d GP- GM GP W = 5 GS S-1 S-2 1 inch of moss over 5 inches of dark brown, sandy, fine to coarse GRAVEL with silt and organics (loose, moist) (TOPSOIL) Brown, sandy, fine to coarse GRAVEL with cobbles (dense, moist) (RECESSIONAL OUTWASH) Grades to include boulders 0 2 4 6 8 10 12 14 Groundwater not encountered.Elevation (ft)GROUNDWATER Depth (ft)TP-1 Test DataGround Elevation (ft):Not measured Excavated By:Yelm Community Schools Logged By:DAR Sample Number& IntervalSampler TypeSOIL PROFILE Rubber-tired BackhoeExcavation Method:USCS SymbolGraphic SymbolSAMPLE DATA Notes: 1. Stratigraphic contacts are based on field interpretations and are approximate. 2. Reference to the text of this report is necessary for a proper understanding of subsurface conditions. 3. Refer to "Soil Classification System and Key" figure for explanation of graphics and symbols. Figure1773003.01 4/2/20 \\OLYMPIA1\PROJECTS\1773\003.010\T\1773003.010.GPJ TEST PIT LOG W/ ELEVATIONYelm Community Schools Transportation Center Improvements Yelm, Washington Log of Test Pits 4 d d d GP- GM GP SM SM W = 6 GS W = 20 GS W = 26 GS S-1 S-2 S-3 9 feet ATD 3 inches of sod over 5 inches of dark brown, sandy, fine to coarse GRAVEL with silt and organics (loose, moist) (TOPSOIL) Dark brown, sandy, fine to coarse GRAVEL with cobbles (medium dense, moist) (FILL) Dark brown, silty, very gravelly, fine to coarse SAND (medium dense, moist) (RECESSIONAL OUTWASH) Brown, very silty, fine to coarse SAND (soft, wet) 0 2 4 6 8 10 12 14 Elevation (ft)GROUNDWATER Depth (ft)TP-2 Test DataGround Elevation (ft):Not measured Excavated By:Yelm Community Schools Logged By:DAR Sample Number& IntervalSampler TypeSOIL PROFILE Rubber-tired BackhoeExcavation Method:USCS SymbolGraphic SymbolSAMPLE DATA Test Pit Completed 03/19/20 Total Depth of Test Pit = 8.5 ft. Test Pit Completed 03/19/20 Total Depth of Test Pit = 10.0 ft. DRAFTd d d GP- GM GP GW W = 3 GS W = 4 GS S-1 S-2 S-3 1 inch of grass/moss over 7 inches of dark brown, sandy, fine to coarse GRAVEL with cobbles, silt, and organics (medium dense, moist) (TOPSOIL) Brown, sandy, fine to coarse GRAVEL with cobbles (dense, moist) (RECESSIONAL OUTWASH) Brown, sandy, fine to coarse GRAVEL with cobbles (dense, moist) 0 2 4 6 8 10 12 14 Groundwater not encountered.Elevation (ft)GROUNDWATER Depth (ft)TP-3 Test DataGround Elevation (ft):Not measured Excavated By:Yelm Community Schools Logged By:DAR Sample Number& IntervalSampler TypeSOIL PROFILE Rubber-tired BackhoeExcavation Method:USCS SymbolGraphic SymbolSAMPLE DATA Notes: 1. Stratigraphic contacts are based on field interpretations and are approximate. 2. Reference to the text of this report is necessary for a proper understanding of subsurface conditions. 3. Refer to "Soil Classification System and Key" figure for explanation of graphics and symbols. Figure1773003.01 4/2/20 \\OLYMPIA1\PROJECTS\1773\003.010\T\1773003.010.GPJ TEST PIT LOG W/ ELEVATIONYelm Community Schools Transportation Center Improvements Yelm, Washington Log of Test Pits 5 d GP- GM GP- GM W = 6 GSS-1 2 inches of sod over 6 inches of dark brown, sandy, fine to coarse GRAVEL with silt and organics (medium dense, moist) (TOPSOIL) Dark brown, very sandy, fine to coarse GRAVEL with silt, cobbles, and demolition debris. Debris generally consists of concrete pieces, rebar, and wood. (medium dense, moist) (FILL) Caving 0 2 4 6 8 10 12 14 Groundwater not encountered.Elevation (ft)GROUNDWATER Depth (ft)TP-4 Test DataGround Elevation (ft):Not measured Excavated By:Yelm Community Schools Logged By:DAR Sample Number& IntervalSampler TypeSOIL PROFILE Rubber-tired BackhoeExcavation Method:USCS SymbolGraphic SymbolSAMPLE DATA Test Pit Completed 03/19/20 Total Depth of Test Pit = 9.5 ft. Test Pit Completed 03/19/20 Total Depth of Test Pit = 4.0 ft. DRAFTGP- GM GP- GM 1.5 inches of sod over 5 inches of dark brown, sandy, fine to coarse GRAVEL with cobbles, silt, and organics (medium dense, moist) (TOPSOIL) Dark brown, very sandy, fine to coarse GRAVEL with silt, cobbles, and concrete pieces (medium dense, moist) (FILL) Caving 0 2 4 6 8 10 12 14 Groundwater not encountered.Elevation (ft)GROUNDWATER Depth (ft)TP-5 Test DataGround Elevation (ft):Not measured Excavated By:Yelm Community Schools Logged By:DAR Sample Number& IntervalSampler TypeSOIL PROFILE Rubber-tired BackhoeExcavation Method:USCS SymbolGraphic SymbolSAMPLE DATA Notes: 1. Stratigraphic contacts are based on field interpretations and are approximate. 2. Reference to the text of this report is necessary for a proper understanding of subsurface conditions. 3. Refer to "Soil Classification System and Key" figure for explanation of graphics and symbols. Figure1773003.01 4/2/20 \\OLYMPIA1\PROJECTS\1773\003.010\T\1773003.010.GPJ TEST PIT LOG W/ ELEVATIONYelm Community Schools Transportation Center Improvements Yelm, Washington Log of Test Pits 6 Test Pit Completed 03/19/20 Total Depth of Test Pit = 4.0 ft. DRAFT0 10 20 30 40 50 60 70 80 90 100 0.0010.010.1110100 60126 1001.5 163 Fine U.S. Sieve Numbers 3/8 140 200 Depth (ft) Natural Moisture (%)Symbol U.S. Sieve Opening in Inches 14 Silt or ClayGravel Unified Soil Classification Grain Size in MillimetersPercent Finer by Weight4 10 303/4 3 20 Sand Hydrometer MediumCoarseCobbles 4 Exploration Number 408 Sample Number Coarse 1/2 50 Fine 6 Soil Description GW GP SM SM GP S-2 S-1 S-2 S-3 S-2 Sandy, fine to coarse GRAVEL Sandy, fine to coarse GRAVEL Silty, very gravelly, fine to coarse SAND Very silty, fine to coarse SAND Sandy, fine to coarse GRAVEL 5 6 20 26 3 7.5 3.0 7.0 9.5 7.0 TP-1 TP-2 TP-2 TP-2 TP-3 Grain Size Distribution 7 Figure 1773003.01 3/30/20 C:\USERS\LLEVINE\DESKTOP\1773003.010.GPJ GRAIN SIZE FIGURE Yelm Community Schools Transportation Center Improvements Yelm, Washington DRAFT0 10 20 30 40 50 60 70 80 90 100 0.0010.010.1110100 60126 1001.5 163 Fine U.S. Sieve Numbers 3/8 140 200 Depth (ft) Natural Moisture (%)Symbol U.S. Sieve Opening in Inches 14 Silt or ClayGravel Unified Soil Classification Grain Size in MillimetersPercent Finer by Weight4 10 303/4 3 20 Sand Hydrometer MediumCoarseCobbles 4 Exploration Number 408 Sample Number Coarse 1/2 50 Fine 6 Soil Description GW GP-GM S-3 S-1 Sandy, fine to coarse GRAVEL Very sandy, fine to coarse GRAVEL with silt 4 6 9.0 3.0 TP-3 TP-4 Grain Size Distribution 8 Figure 1773003.01 3/30/20 C:\USERS\LLEVINE\DESKTOP\1773003.010.GPJ GRAIN SIZE FIGURE Yelm Community Schools Transportation Center Improvements Yelm, Washington APPENDIX 4 MOUNDING ANALYSIS REPORT Technical Memorandum 2107 S C St • Tacoma, Washington 98405 • (253)-284-4872 TO: Charlie Severs, PE FROM: Kelsey Mach, GIT and Ben Lee, PE DATE: February 19, 2020 RE: Groundwater Mounding Analysis Yelm Community Schools – 202 NW Stevens Avenue Yelm, Washington Project No. 1174040.010 Introduction This technical memorandum summarizes the results of a groundwater mounding analysis (mounding analysis) performed by Landau Associates, Inc. (LAI) in support of Yelm Community Schools (District) Transportation Center Improvements Project (project) located at 202 Northwest Stevens Avenue in Yelm, Washington (site). The project involves expanding bus parking facilities at the site; the site location is shown on Figure 1. As part of the project, the District proposes to construct approximately 30,000 square feet (SF; 0.69 acres) of additional impervious parking area on the western portion of the site and an associated 850 SF (bottom area) stormwater infiltration facility (facility) in the southwest corner of the site. The facility will be used to manage stormwater runoff generated by the proposed expanded impervious parking area. Background The facility and expanded parking area are being designed by SCJ Alliance (SCJ). The conceptual design for the facility and expanded parking area is shown on Figure 2. The expanded parking area is being designed so that all of its stormwater runoff will be routed to the facility; all stormwater runoff from previously constructed impervious parking areas at the site will continue to be routed to the previously constructed stormwater infiltration trench located along the western edge of the site. Some additional proposed parking areas along the northern portion of the site will be constructed with pervious pavement and will therefore not contribute stormwater flows to either facility. The City of Yelm (City) requires the facility to be designed in accordance with Yelm Municipal Code (YMC) Section 18.21.070G (Performance Standards – General Requirements in High Ground Water Hazard Areas) due to the following conditions of the project: proposed improvements include addition of impervious surface on the site, the site is located adjacent to a High Ground Water Hazard Area (HGWHA), and a portion of the site is within the High Groundwater Hazard Review Area boundary of Thurston County. Standard #4 of YMC 18.21.070G requires the bottom of any stormwater infiltration facility to be located at least 6 feet (ft) above the base flood elevation (i.e., the land elevation at the outer edge of the HGWHA, per YMC 18.21.070G[1]) but YMC 18.21.010C allows flexibility in stormwater facility design requirements with attention to site-specific characteristics. Based on elevations noted in the Google Earth website, the location of the bottom of the existing facility Landau Associates Groundwater Mounding Analysis Yelm Community Schools 2 February 19, 2020 (assumed to be similar to that of the proposed facility) appears to be at an elevation less than 6 ft above the nearby HGWHA. Accordingly, the City may allow a vertical separation between the facility bottom and nearby flood elevation of less than 6 ft if a groundwater mounding analysis indicates that impacts to groundwater from the proposed improvements are likely to be minimal (i.e., less than 0.5 ft) at the adjacent property boundaries (McCoy, D. 2019). This mounding analysis has been completed in accordance with the Washington State Department of Ecology (Ecology) Stormwater Management Manual of Western Washington (2019 manual; Ecology 2019), adopted by the City for stormwater infrastructure design criteria, as well as the City’s established criteria for mounding analyses (i.e., 0.5 ft simulated mound at the adjacent property boundaries). Hydrogeologic Conceptual Model This section summarizes the basic hydrogeologic setting of the site, based primarily on the following references: Yelm Groundwater Baseline Sampling (Erickson 1998), Water-Resources Investigations Report 99-4165 (USGS 1999), Yelm Hydrogeologic Investigation along Thompson and Yelm Creeks (Thurston County 2008), and surficial geology maps. Surface and Subsurface Soils The near-surface soil in the vicinity of the site has been characterized based on surficial geology mapping (USGS 1998) and proximal soil borings (Erickson 1998, USGS 1999) as unconsolidated Holocene-age alluvium and Vashon Recessional Outwash deposits (Qvr). The Qvr is a locally contiguous, coarse-grained formation with a general thickness of between 10 and 40 ft (USGS 1999), but has been recorded as being around 25 ft near the site (Erickson 1998). Beneath the Qvr is Vashon- age glacial till (Qvt), which is a regionally contiguous fine-grained, low permeability formation that generally acts as a regional aquitard. The Qvt has been identified beneath the Qvr in the vicinity of the site. Groundwater Levels The Qvr aquifer is unconfined and is recharged primarily by percolation of precipitation and seepage from streams and lakes. Where the Qvr aquifer is saturated, groundwater flow patterns are primarily influenced by local features. Local flow patterns near the site are generally north-northeast toward the Nisqually River (located approximately 2 miles away). Groundwater levels beneath the site are assumed to be similar, in terms of depth-to-water relative to ground surface, to that observed in two nearby off-site monitoring wells thought to be installed in Qvr material. For example, groundwater was measured at a nearby well, 20N03, located approximately 0.5 miles north of the site to be 7.48 ft below ground surface (bgs) in April 1996 (Erickson 1998). In addition, a Thurston County groundwater monitoring well referred to as Y07 Yelm Creek at Crystal Springs Road (or YB-5 in other references) with historical semi-continuous recorded groundwater Landau Associates Groundwater Mounding Analysis Yelm Community Schools 3 February 19, 2020 levels is located approximately 1 mile north (down-gradient) of the site and shows the shallow groundwater level having a seasonal fluctuation averaging 8 ft between 2008 and 2012, as shown on Figure 3. A map of the location of the Y07 well and the associated soil boring log (which indicates installation within material consistent with the Qvr) are included in Attachment 1. Hydraulic Conductivity Generally, the Qvr material is considered to be highly permeable. The hydraulic conductivity of the Qvr within Thurston County generally ranges between 14 and 2,100 ft per day based on tests from 43 wells (USGS 1999). A local groundwater study in the vicinity of the City documents the hydraulic conductivity of the Qvr as ranging between 4,800 and 66,000 ft per day near the site, based two pumping tests from a single well (Erickson 1998). A review of literature values indicates that the hydraulic conductivity for material similar to the Qvr unit may be within the range of 0.25 (fine sand) to 8,500 ft per day (coarse gravel) (Schwartz and Zhang 2003; Fetter 2001; Freeze and Cherry 1979). A previous mounding analysis performed for the District at the site assumed a hydraulic conductivity value of 4,800 ft per day, based on the low end of the range from Erickson (1998). A somewhat more conservative estimate of the hydraulic conductivity of the Qvr beneath the site was refined during calibration of the current mounding analysis model based on estimated precipitation recharge and observed seasonal groundwater fluctuations, as described below. The Qvt located beneath the Qvr aquifer generally exhibits low permeability and is typically considered an aquitard (i.e. barrier to flow). Hydraulic conductivity of the Qvt material in the general vicinity of the site has been documented as ranging between 5.2 and 89 ft per day (USGS 1999). Literature values for hydraulic conductivity of glacial till range between 2x10-3 to 0.3 ft per day (Fetter 2001). Infiltration Facility Design The preliminary proposed location and layout of the facility, as developed by SCJ, is shown on Figure 2. The bottom area of the facility is planned to be approximately 850 SF. The area contributing stormwater runoff to the facility 1 will be the proposed extended impervious parking area of approximately 30,000 SF, as shown on Figure 2. For the purposes of this mounding analysis, it was assumed that the design infiltration rate of the facility is high (i.e., at least 20 inches per hour) and is not a limiting factor for infiltrating flows to the facility (i.e., the facility is able to infiltrate all of the stormwater volume routed to it), consistent with similar projects constructed within the highly permeable Qvr material. It is assumed that the final facility design will be based on in-situ assessment 1 Runoff from the previously existing impervious area of the site will continue to be routed to the existing infiltration trench along the western margin of the site. Landau Associates Groundwater Mounding Analysis Yelm Community Schools 4 February 19, 2020 of the infiltration capacity of soils at the site and Western Washington Hydrologic Model (WWHM) modeling performed by SCJ. Groundwater Mounding Analysis Routing stormwater runoff from impervious surfaces toward an infiltration facility results in a concentration of groundwater recharge beneath the facility. The concentrated groundwater recharge may cause groundwater mounding conditions, the extent of which is dependent on the timing and magnitude of the flows routed to the facility, the design of the facility, and the hydraulic properties of the underlying soil. Groundwater mounding reduces vertical separation between the bottom of the infiltration facility and the underlying groundwater table and in extreme conditions may lead to flooding conditions, both beneath the facility and in surrounding areas including neighboring properties. Because the site is located adjacent to a HGWHA, and because a portion of the site is within the High Groundwater Hazard Review Area boundary of Thurston County, a mounding analysis is required to estimate the degree of groundwater mounding that may be present at the site boundary due to stormwater infiltration into the proposed facility from the proposed improvements. For this project, a mounding analysis was completed using a numerical groundwater flow model (model) solved with the USGS MODFLOW finite-difference groundwater flow modeling code accessed through Aquaveo’s™ GMS graphical user interface. Groundwater mounding was estimated by running two MODFLOW simulations with input data derived from WWHM simulations of stormwater flow to the facility from the proposed impervious expanded parking area. The first simulation represents background groundwater recharge and groundwater level (head) conditions due to precipitation over time assuming undeveloped (i.e., lawn) land surface cover (referred to herein as pre-developed background conditions). The second simulation represents groundwater recharge and head conditions under the proposed site improvements including the routing of stormwater flows to the proposed facility from the proposed expanded impervious area only (referred to herein as developed conditions). The estimated groundwater mound was calculated by subtracting the simulated pre-developed head conditions from the simulated developed head conditions. Thus, the estimated groundwater mound is a reflection of the proposed improvements only (i.e., other impervious areas within and around the site are neglected for simplicity). Representative WWHM simulations were performed based on the preliminary design parameters of the proposed improvements and output data were converted to MODFLOW model input data by LAI. The period of simulations for the WWHM modeling included water years 1959 through 2008 (the period of record available within WWHM). Monthly recharge outputs from the most recent 20 year period in the WWHM model (water years 1989 through 2008) were chosen for the model calibration Landau Associates Groundwater Mounding Analysis Yelm Community Schools 5 February 19, 2020 period. The 3-year period encompassing the greatest monthly and daily recharge volumes, based on output data from the WWHM model, was chosen for the mounding analysis period (water years 2006 through 2008). Water years 2006 through 2008 were chosen to provide one year of model “spin-up” time (water year 2006) before including the year with the largest volumetric monthly recharge (November 2006, within water year 2007) as well as the largest volumetric daily recharge (December 3, 2007, within water year 2008) from throughout the WWHM period of record to assess the effect of various peak recharge rates. Numerical Model Construction The following sections describe the construction of the numerical groundwater model and assignment of model boundary conditions and hydraulic parameters based on the hydrogeologic conceptual model described above. Model Domain and Grid Design The model domain was constructed to be approximately 12,000 ft by 12,000 ft (or approximately 20 times the dimensions of the site in all directions, in accordance with general groundwater modeling practices), centered on the proposed facility. Grid cells were constructed of varying sizes, from 5 ft square (i.e., 5 ft by 5 ft) near the proposed facility, to 500 ft square toward the model boundaries. The larger grid cells away from the site allowed for reduced computational efforts during model runs. The length of adjacent cells was varied by a maximum factor of 1.2 (to avoid extreme changes in grid cell dimensions, which can introduce numerical instabilities). The dimensions and layout of the model grid are shown on Figure 4. The model was constructed with a single 35-ft horizontal layer to represent the Qvr aquifer. The bottom of the model was assigned as a no-flow boundary at approximately 315 ft National Geodetic Vertical Datum of 1929 (NGVD29, approximately 25 ft bgs) to represent the fine-grained Qvt aquitard. Hydraulic Parameters Aquifer hydraulic parameters (hydraulic conductivity and specific yield) values were assigned uniformly across the model to be representative of the coarse-grained Qvr material. The model hydraulic conductivity value was calibrated (i.e., varied iteratively by modifying its value and assessing simulated head conditions to observed groundwater levels) by comparing simulated monthly groundwater levels at the center of the model under background recharge conditions (as determined from WWHM simulations of flat lawn), to observed seasonal groundwater level fluctuations recorded from the nearby off-site well Y07 from 2008 to 2012. A hydrograph of observed head from the nearby off-site well Y07 is shown on Figure 3. Simulated monthly groundwater levels under calibrated conditions are shown on Figure 5. The hydraulic conductivity value was decreased during the calibration process from an initial 2,100 ft per day down to 750 ft per day in order for the simulated seasonal fluctuations to approximately match those observed in nearby off-site well Y07. This Landau Associates Groundwater Mounding Analysis Yelm Community Schools 6 February 19, 2020 hydraulic conductivity value – relatively low compared to the range reported in the literature for similar material as well as to that used in previous modeling at the site for the existing impervious area – can be considered conservative for estimating groundwater mounding at the site (i.e., a lower hydraulic conductivity value would generally result in greater mounding). Specific yield was assigned a value of 0.15 based on typical literature values for sand and gravel (Schwartz and Zhang 2003; Fetter 2001; Freeze and Cherry 1979). Time Discretization The model was set up in transient mode to simulate varying recharge and resulting head conditions over time throughout the period of simulation. Monthly stress periods (i.e., time steps) were utilized for the calibration simulation, and daily time steps were used for the mounding analysis simulations in order to account for instances of peak daily recharge. The use of daily time steps for the mounding analysis simulations can be considered conservative, since short-duration heavy precipitation events could result in high mounding conditions (whereas using monthly time steps would likely even out the largest precipitation events). The recharge input parameters for each time step were derived from groundwater recharge values calculated from WWHM output data for the corresponding month or day, described in the next section. Boundary Conditions and Recharge A specified head boundary condition was assigned to all model perimeter cells to simulate background static water level (i.e. water level if no precipitation recharge occurred). The constant head boundary cells were assigned a head value of 332 ft NGVD29 (approximately 8 ft bgs) based on observed water level data from nearby off-site well 20N03 (Erickson 1998). Groundwater recharge was assigned to the model via the recharge package in MODFLOW. Monthly and daily recharge rates throughout the transient simulation duration (water years 1989 through 2008 for calibration and water years 2006 through 2008 for the mounding analysis) were calculated by dividing simulated monthly or daily flow volumes (in units of acre-ft per month) from the WWHM output data by the area to which they were applied in the MODFLOW model, converted to units of ft per day. Recharge rates for pre-developed conditions (i.e., prior to proposed improvements) and developed conditions (i.e., following proposed improvements) simulations were calculated using WWHM output data and applied to the model as described below: • Pre-developed conditions: daily and monthly groundwater recharge rates were based on WWHM-derived recharge volumes from an arbitrary 1-acre basin with lawn ground surface coverage. The transient background recharge rates (in units of ft per day) were applied uniformly to all model cells. • Developed conditions: daily groundwater recharge rates were calculated for the proposed facility based on WWHM-simulated recharge volumes from a contributing area of 30,000 SF of Landau Associates Groundwater Mounding Analysis Yelm Community Schools 7 February 19, 2020 impervious pavement ground surface and applied to the facility area of 850 SF. The facility recharge rates were applied to the grid cells representing the facility consisting of approximately 850 SF. A recharge rate of 0.0 ft per day was assigned for the proposed impervious area (i.e., no recharge to the proposed expanded parking area). Calculated daily recharge rates applied to the model for the background and infiltration facility areas are provided in Attachment 2. A mass balance of daily water entering (via precipitation) and leaving (via groundwater recharge or evaporation) the modelled system is provided in Attachment 3. Mounding Analysis Results The mounding analysis was performed by comparing the developed conditions simulation (i.e., including the facility and proposed impervious area) to the pre-developed conditions simulation (i.e., background recharge only). Model input parameters were consistent between the two simulations with the exception of recharge rates applied within the site (i.e., to the proposed facility and expanded parking area). The simulated mound was defined as the difference between the two resulting head solutions during each daily time step and is therefore an estimate of the relative impact of the proposed site improvements. The magnitude of estimated groundwater mounding over time was assessed by placing a simulated observation well in the center of the facility, as shown on Figure 4. The observation well recorded simulated head at each time step (i.e. each day) throughout the model duration (i.e. water years 2006 through 2008). The estimated groundwater mound height over time directly beneath the facility, which can be considered to represent the maximum magnitude of mounding at any given time (the mound declines in magnitude radially away from the facility), is shown on Figure 6. The maximum daily groundwater mound was simulated during the model time step representing December 4, 2007. Maximum mounding beneath the facility was estimated to be 0.32 ft on that day. The lateral extent of estimated maximum mounding was assessed by producing isometric mounding contour lines from that day, as shown on Figure 7. The maximum simulated mound height at the nearest property boundary was calculated to be 0.20 ft. Based on the use of generally conservative parameters during model development, this conclusion can be considered to be conservative. An estimated groundwater mound of less than 0.5 ft at the site property boundary indicates that the project meets the City’s mounding analysis criteria. LAI recommends verifying that in-situ infiltration rates at the site are indeed likely to be high and non-limiting for infiltration of stormwater flows. Groundwater Model Limitations The groundwater modeling described above is highly simplified relative to in-situ conditions and is not meant to represent actual groundwater conditions at the project site. Actual conditions not fully represented by the model include non-uniform hydraulic conductivity fields, highly complicated Landau Associates Groundwater Mounding Analysis Yelm Community Schools 8 February 19, 2020 groundwater recharge mechanisms, and peak storm events not represented in the WWHM historical precipitation record. While the model is calibrated to simulate observed seasonal groundwater fluctuations in the vicinity of the project site, there are likely to be discrepancies between simulated heads and actual groundwater levels experienced at the project site. Limitations This Technical Memorandum has been prepared for the exclusive use of SCJ and Yelm Community Schools for specific application to the Transportation Center Improvements project. No other party is entitled to rely on the information, conclusions, and recommendations included in this document without the express written consent of Landau Associates. Further, the reuse of information, conclusions, and recommendations provided herein for extensions of the project or for any other project, without review and authorization by Landau Associates, shall be at the user’s sole risk. Landau Associates warrants that within the limitations of scope, schedule, and budget, our services have been provided in a manner consistent with that level of care and skill ordinarily exercised by members of the profession currently practicing in the same locality under similar conditions as this project. We make no other warranty, either express or implied. This document has been prepared under the supervision and direction of the following key staff. LANDAU ASSOCIATES, INC. Kelsey Mach Project GIT Ben Lee, P.E. Associate Engineer KAM\BDL\kjg [\\TACOMA3\PROJECT\1174\040.010\R\MOUNDING ANALYSIS_TM.DOCX] Landau Associates Groundwater Mounding Analysis Yelm Community Schools 9 February 19, 2020 References Ecology. 2019. Stormwater Management Manual for Western Washington. Olympia, Washington: Washington State Department of Ecology. Erickson, D. 1998. Report: Yelm Groundwater Baseline Sampling. Publication No. 98-301. Denis Erickson, Washington State Department of Ecology. January. Fetter, C.W. 2001. Applied Hydrogeology, 4th ed. Englewood Cliffs, NJ: Prentice-Hall, Inc. Freeze, R.A., and J.A. Cherry. 1979. Groundwater. Englewood Cliffs, NJ: Prentice-Hall, Inc. McCoy, D. 2019. Email message from Derek McCoy, Civil Review Engineer, Community and Economic Development, City of Yelm, Washington, to Benjamin Lee, PE, CWRE, Associate, Landau Associates, Inc. Re: 202 NW Stevens Ave – Mounding Analysis. December 24. Schwartz, F.W., and H. Zhang. 2003. Fundamentals of Ground Water. New York: John Wiley & Sons, Inc. Thurston County. 2008. Report of Findings: Yelm Hydrogeologic Investigation Along Thompson and Yelm Creeks, Yelm, Washington, April 1 through April 4. Prepared for Water and Waste Management Thurston County by Nadine Romero, Hydrogeologist, LPG, LPHG, Environmental Health, Thurston County. May 8. USGS 1998. Water-Resources Investigations Report 92-4109: Hydrology and Quality of Ground Water in Northern Thurston County, Washington. By B.W. Drost, G.L. Turney, N.P. Dion, and M.A. Jones; U.S. Geological Survey (USGS), Tacoma, Washington. USGS 1999. Water-Resources Investigations Report 99-4165: Conceptual Model and Numerical Simulation of the Ground-Water-Flow System in the Unconsolidated Sediments of Thurston County, Washington. By B.W. Drost, D.M. Ely, and W.E. Lum, II; U.S. Geological Survey (USGS), in cooperation with Thurston County Health Department, Tacoma, Washington. Attachments: Figure 1: Vicinity Map Figure 2: Bus Transportation Facility Site Plan Figure 3: Y07 Historical Water Levels Figure 4: Model Setup Figure 5: Simulated Calibration Head Figure 6: Simulated Groundwater Mounding Time Series Figure 7: Maximum Simulated Mound Attachment 1: Y07 Well Log and Map of Location Attachment 2: Recharge Rate Calculations Attachment 3: Model Mass Balance ST507 J o i n t B a s e L e w i s -M c Ch o rd Ye l m H i g hSchool Yel mMiddleSchool ST510 ST507 1St St SYelm Hwy SEE Yelm Ave Bald Hill Rd SE YelmDitch N i s q uallyRiver YelmCreek T h o mp s o n Creek Centralia Canal F i v e C o r n e r sFive C o r n e r s Fo u r C o r n e r sFour C o r n e r s N o r t h Ye l mNorth Ye l m Ye l mYelm Data Source: Esri 2012 Groundwater Mounding Analysis Yel m C ommunity Schools Yelm, Washington Vicinity Map Figure1 0 0.5 1 Miles G:\Projects\1174\040\F01VicMap.mxd 2/7/2020 Project Location 202 NW Stevens Ave ! ! ! ! !! ! W a s h i n g t o nWashington Olympia Tacoma Spokane EverettSeattle ProjectLocation Figure 2 Bus Transportation Facility Site Plan 2/7/20 \\tacoma3\PROJECT\1174\040.010\R\Figs\F02_Bus Transportation Facility Site Plan.docx Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Figure 3 Y07 Yelm Creek at Crystal Springs Rd Historical Water Levels 2/19/20 \\tacoma3\PROJECT\1174\040.010\R\Figs\F03_Y07 Hydrograph.docx Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Data Source: Thurston County Community Planning and Economic Development Figure 4 Model Setup 2/19/20 \\tacoma3\PROJECT\1174\040.010\R\Figs\F04_Model Setup.docx Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Grid Cell Dimensions: •5 ft x 5 ft at project site •up to 500 ft x 500 ft outside project site Constant Head Boundary Condition •332 ft NGVD29 Infiltration Facility Property Boundary Conceptual Cross Section through Site 350 ft NGVD29 315 ft NGVD29 Recessional Outwash (Qvr aquifer) Till (aquitard) Water Table (332 ft NGVD29) Observation Well Figure 5 Simulated Calibration Head 2/19/20 \\tacoma3\PROJECT\1174\040.010\R\Figs\F05_Simulated Calibration Head.docx Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Notes 1) Simulated heads are from an observation well placed in the model near the center of the project site. 2) Markers show head simulated during the each monthly time step. Figure 6 Simulated Groundwater Mounding Time Series 2/19/20 \\tacoma3\PROJECT\1174\040.010\R\Figs\F06_Simulated Groundwater Mound Time Series.docx Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Notes 1) Simulated mound was calculated by subtracting simulated head at the center of the infiltration facility under pre-developed conditions from simulated head under developed conditions. 2) Markers show the groundwater mound simulated during each daily time step. Figure 7 Maximum Simulated Mound 2/19/20 \\tacoma3\PROJECT\1174\040.010\R\Figs\F07_Max Simulated Mound.docx Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Notes: 1) Simulated mound contours shown are from the simulated model time-step for December 4, 2007, and represent maximum estimated groundwater mounding conditions. 2) Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. ATTACHMENT 1 Y07 Well Log and Map of Location Disclaimer: Thurston County makes every effort to ensure that this map is a true and accurate representation of the work of County government. However, the County and all related personnel make no warranty, expressed or implied, regarding the accuracy, completeness or convenience of any information disclosed on this map. Nor does the County accept liability for any damage or injury caused by the use of this map. To the fullest extent permissible pursuant to applicable law, Thurston County disclaims all warranties, express or implied, including, but not limited to, implied warranties of merchant ability, data fitness for a particular purpose, and non-infringements of proprietary rights. Under no circumstances, including, but not limited to, negligence, shall Thurston County be liable for any direct, indirect, incidental, special or consequential damages that result from the use of, or the inability to use, Thurston County materials. © 2008 - Thurston County GeoData Center 2404 Heritage Court SW, 3rd Floor Olympia, WA 98502‐6031 4 Yelm And Thompson Creek Basin Groundwater Study 4 Proposed GW Well Locations ATTACHMENT 2 Recharge Rate Calculations ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 1 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) 10/1/2005 0.0012 0.0012 0.0012 0.0614 10/2/2005 0.0097 0.0097 0.0116 0.5924 10/3/2005 0.0048 0.0048 0.0064 0.3256 10/4/2005 0.0000 0.0000 0.0002 0.0112 10/5/2005 0.0000 0.0000 0.0000 0.0000 10/6/2005 0.0061 0.0061 0.0068 0.3507 10/7/2005 0.0207 0.0207 0.0255 1.3093 10/8/2005 0.0075 0.0075 0.0082 0.4201 10/9/2005 0.0003 0.0003 0.0010 0.0523 10/10/2005 0.0001 0.0001 0.0000 0.0000 10/11/2005 0.0000 0.0000 0.0000 0.0000 10/12/2005 0.0005 0.0005 0.0000 0.0024 10/13/2005 0.0065 0.0065 0.0078 0.3996 10/14/2005 0.0058 0.0058 0.0039 0.2021 10/15/2005 0.0194 0.0194 0.0236 1.2101 10/16/2005 0.0000 0.0000 0.0002 0.0101 10/17/2005 0.0000 0.0000 0.0000 0.0000 10/18/2005 0.0000 0.0000 0.0000 0.0000 10/19/2005 0.0087 0.0087 0.0091 0.4655 10/20/2005 0.0000 0.0000 0.0004 0.0187 10/21/2005 0.0000 0.0000 0.0000 0.0000 10/22/2005 0.0000 0.0000 0.0000 0.0000 10/23/2005 0.0050 0.0050 0.0051 0.2591 10/24/2005 0.0000 0.0000 0.0000 0.0015 10/25/2005 0.0061 0.0061 0.0048 0.2472 10/26/2005 0.0000 0.0000 0.0015 0.0751 10/27/2005 0.0031 0.0031 0.0021 0.1073 10/28/2005 0.0164 0.0164 0.0166 0.8503 10/29/2005 0.0069 0.0069 0.0086 0.4399 10/30/2005 0.0075 0.0075 0.0037 0.1884 10/31/2005 0.0902 0.0902 0.1097 5.6215 11/1/2005 0.0019 0.0019 0.0028 0.1452 11/2/2005 0.0105 0.0105 0.0092 0.4725 11/3/2005 0.0213 0.0213 0.0209 1.0724 11/4/2005 0.0539 0.0539 0.0557 2.8535 11/5/2005 0.0610 0.0610 0.0562 2.8792 11/6/2005 0.0183 0.0183 0.0161 0.8259 11/7/2005 0.0091 0.0091 0.0093 0.4761 11/8/2005 0.0015 0.0015 0.0010 0.0533 11/9/2005 0.0002 0.0002 0.0000 0.0000 11/10/2005 0.0005 0.0005 0.0001 0.0061 11/11/2005 0.0344 0.0344 0.0307 1.5734 11/12/2005 0.0132 0.0132 0.0100 0.5144 Pre-Developed Recharge Developed Facility Recharge ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 2 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 11/13/2005 0.0303 0.0303 0.0289 1.4832 11/14/2005 0.0007 0.0007 0.0000 0.0005 11/15/2005 0.0006 0.0006 0.0000 0.0000 11/16/2005 0.0004 0.0004 0.0000 0.0006 11/17/2005 0.0004 0.0004 0.0000 0.0000 11/18/2005 0.0003 0.0003 0.0000 0.0000 11/19/2005 0.0002 0.0002 0.0000 0.0000 11/20/2005 0.0001 0.0001 0.0000 0.0000 11/21/2005 0.0000 0.0000 0.0000 0.0000 11/22/2005 0.0000 0.0000 0.0000 0.0000 11/23/2005 0.0000 0.0000 0.0000 0.0000 11/24/2005 0.0000 0.0000 0.0000 0.0000 11/25/2005 0.0000 0.0000 0.0000 0.0000 11/26/2005 0.0000 0.0000 0.0000 0.0000 11/27/2005 0.0000 0.0000 0.0000 0.0000 11/28/2005 0.0000 0.0000 0.0000 0.0000 11/29/2005 0.0000 0.0000 0.0000 0.0000 11/30/2005 0.0000 0.0000 0.0000 0.0000 12/1/2005 0.0236 0.0236 0.0164 0.8390 12/2/2005 0.0194 0.0194 0.0219 1.1224 12/3/2005 0.0000 0.0000 0.0000 0.0000 12/4/2005 0.0000 0.0000 0.0000 0.0000 12/5/2005 0.0000 0.0000 0.0000 0.0006 12/6/2005 0.0000 0.0000 0.0000 0.0000 12/7/2005 0.0000 0.0000 0.0000 0.0000 12/8/2005 0.0000 0.0000 0.0000 0.0000 12/9/2005 0.0000 0.0000 0.0000 0.0000 12/10/2005 0.0000 0.0000 0.0000 0.0000 12/11/2005 0.0000 0.0000 0.0000 0.0000 12/12/2005 0.0000 0.0000 0.0000 0.0000 12/13/2005 0.0000 0.0000 0.0000 0.0000 12/14/2005 0.0000 0.0000 0.0000 0.0000 12/15/2005 0.0000 0.0000 0.0000 0.0000 12/16/2005 0.0000 0.0000 0.0000 0.0000 12/17/2005 0.0000 0.0000 0.0000 0.0000 12/18/2005 0.0000 0.0000 0.0000 0.0000 12/19/2005 0.0192 0.0192 0.0147 0.7541 12/20/2005 0.0233 0.0233 0.0209 1.0729 12/21/2005 0.0402 0.0402 0.0342 1.7529 12/22/2005 0.0428 0.0428 0.0373 1.9120 12/23/2005 0.0834 0.0834 0.0728 3.7322 12/24/2005 0.0298 0.0298 0.0300 1.5357 12/25/2005 0.0693 0.0693 0.0577 2.9563 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 3 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 12/26/2005 0.0395 0.0395 0.0322 1.6477 12/27/2005 0.0209 0.0209 0.0156 0.7995 12/28/2005 0.0562 0.0562 0.0432 2.2149 12/29/2005 0.0251 0.0251 0.0168 0.8595 12/30/2005 0.0662 0.0662 0.0548 2.8068 12/31/2005 0.0344 0.0344 0.0272 1.3950 1/1/2006 0.0143 0.0143 0.0105 0.5366 1/2/2006 0.0210 0.0210 0.0159 0.8131 1/3/2006 0.0204 0.0204 0.0141 0.7227 1/4/2006 0.0036 0.0036 0.0046 0.2344 1/5/2006 0.0607 0.0607 0.0466 2.3871 1/6/2006 0.0153 0.0153 0.0115 0.5871 1/7/2006 0.0370 0.0370 0.0274 1.4046 1/8/2006 0.0044 0.0044 0.0039 0.1979 1/9/2006 0.1052 0.1052 0.0776 3.9785 1/10/2006 0.1326 0.1326 0.1063 5.4471 1/11/2006 0.0415 0.0415 0.0331 1.6967 1/12/2006 0.0582 0.0582 0.0428 2.1909 1/13/2006 0.0417 0.0417 0.0297 1.5217 1/14/2006 0.0067 0.0067 0.0057 0.2904 1/15/2006 0.0047 0.0047 0.0026 0.1326 1/16/2006 0.0977 0.0977 0.0689 3.5308 1/17/2006 0.0182 0.0182 0.0187 0.9604 1/18/2006 0.0141 0.0141 0.0096 0.4936 1/19/2006 0.0059 0.0059 0.0011 0.0574 1/20/2006 0.0642 0.0642 0.0525 2.6924 1/21/2006 0.0024 0.0024 0.0009 0.0469 1/22/2006 0.0008 0.0008 0.0000 0.0000 1/23/2006 0.0006 0.0006 0.0000 0.0000 1/24/2006 0.0005 0.0005 0.0000 0.0005 1/25/2006 0.0007 0.0007 0.0000 0.0017 1/26/2006 0.0338 0.0338 0.0243 1.2453 1/27/2006 0.0278 0.0278 0.0207 1.0603 1/28/2006 0.0600 0.0600 0.0458 2.3479 1/29/2006 0.1261 0.1261 0.0983 5.0357 1/30/2006 0.1049 0.1049 0.0845 4.3289 1/31/2006 0.0475 0.0475 0.0323 1.6540 2/1/2006 0.0295 0.0295 0.0196 1.0019 2/2/2006 0.0679 0.0679 0.0521 2.6692 2/3/2006 0.0091 0.0091 0.0051 0.2605 2/4/2006 0.0681 0.0681 0.0509 2.6108 2/5/2006 0.0028 0.0028 0.0020 0.1030 2/6/2006 0.0007 0.0007 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 4 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 2/7/2006 0.0006 0.0006 0.0000 0.0000 2/8/2006 0.0005 0.0005 0.0000 0.0006 2/9/2006 0.0004 0.0004 0.0000 0.0000 2/10/2006 0.0003 0.0003 0.0000 0.0000 2/11/2006 0.0003 0.0003 0.0000 0.0000 2/12/2006 0.0002 0.0002 0.0000 0.0000 2/13/2006 0.0002 0.0002 0.0000 0.0000 2/14/2006 0.0002 0.0002 0.0000 0.0000 2/15/2006 0.0002 0.0002 0.0000 0.0000 2/16/2006 0.0001 0.0001 0.0000 0.0000 2/17/2006 0.0001 0.0001 0.0000 0.0000 2/18/2006 0.0000 0.0000 0.0000 0.0000 2/19/2006 0.0000 0.0000 0.0000 0.0000 2/20/2006 0.0000 0.0000 0.0000 0.0000 2/21/2006 0.0000 0.0000 0.0000 0.0000 2/22/2006 0.0000 0.0000 0.0000 0.0000 2/23/2006 0.0255 0.0255 0.0192 0.9845 2/24/2006 0.0000 0.0000 0.0000 0.0019 2/25/2006 0.0000 0.0000 0.0000 0.0000 2/26/2006 0.0060 0.0060 0.0030 0.1548 2/27/2006 0.0165 0.0165 0.0114 0.5859 2/28/2006 0.0273 0.0273 0.0227 1.1645 3/1/2006 0.0003 0.0003 0.0005 0.0280 3/2/2006 0.0001 0.0001 0.0000 0.0000 3/3/2006 0.0000 0.0000 0.0000 0.0000 3/4/2006 0.0000 0.0000 0.0000 0.0005 3/5/2006 0.0004 0.0004 0.0001 0.0050 3/6/2006 0.0006 0.0006 0.0000 0.0015 3/7/2006 0.0015 0.0015 0.0012 0.0608 3/8/2006 0.0461 0.0461 0.0365 1.8686 3/9/2006 0.0323 0.0323 0.0236 1.2118 3/10/2006 0.0124 0.0124 0.0082 0.4184 3/11/2006 0.0086 0.0086 0.0082 0.4207 3/12/2006 0.0001 0.0001 0.0000 0.0000 3/13/2006 0.0001 0.0001 0.0000 0.0000 3/14/2006 0.0028 0.0028 0.0014 0.0727 3/15/2006 0.0115 0.0115 0.0084 0.4299 3/16/2006 0.0118 0.0118 0.0090 0.4591 3/17/2006 0.0164 0.0164 0.0119 0.6094 3/18/2006 0.0000 0.0000 0.0002 0.0106 3/19/2006 0.0000 0.0000 0.0000 0.0000 3/20/2006 0.0000 0.0000 0.0000 0.0000 3/21/2006 0.0000 0.0000 0.0000 0.0005 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 5 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 3/22/2006 0.0000 0.0000 0.0000 0.0000 3/23/2006 0.0000 0.0000 0.0000 0.0000 3/24/2006 0.0132 0.0132 0.0098 0.5017 3/25/2006 0.0000 0.0000 0.0000 0.0000 3/26/2006 0.0027 0.0027 0.0019 0.0963 3/27/2006 0.0000 0.0000 0.0000 0.0000 3/28/2006 0.0000 0.0000 0.0000 0.0000 3/29/2006 0.0000 0.0000 0.0000 0.0005 3/30/2006 0.0000 0.0000 0.0000 0.0000 3/31/2006 0.0092 0.0092 0.0032 0.1635 4/1/2006 0.0077 0.0077 0.0110 0.5637 4/2/2006 0.0000 0.0000 0.0000 0.0000 4/3/2006 0.0000 0.0000 0.0000 0.0000 4/4/2006 0.0000 0.0000 0.0000 0.0005 4/5/2006 0.0000 0.0000 0.0000 0.0000 4/6/2006 0.0000 0.0000 0.0000 0.0000 4/7/2006 0.0000 0.0000 0.0000 0.0000 4/8/2006 0.0000 0.0000 0.0000 0.0000 4/9/2006 0.0000 0.0000 0.0000 0.0000 4/10/2006 0.0000 0.0000 0.0000 0.0000 4/11/2006 0.0000 0.0000 0.0000 0.0000 4/12/2006 0.0000 0.0000 0.0000 0.0000 4/13/2006 0.0000 0.0000 0.0000 0.0000 4/14/2006 0.0000 0.0000 0.0000 0.0000 4/15/2006 0.0000 0.0000 0.0000 0.0000 4/16/2006 0.0000 0.0000 0.0000 0.0000 4/17/2006 0.0000 0.0000 0.0000 0.0000 4/18/2006 0.0000 0.0000 0.0000 0.0000 4/19/2006 0.0000 0.0000 0.0000 0.0000 4/20/2006 0.0000 0.0000 0.0000 0.0000 4/21/2006 0.0000 0.0000 0.0000 0.0000 4/22/2006 0.0000 0.0000 0.0000 0.0000 4/23/2006 0.0000 0.0000 0.0000 0.0000 4/24/2006 0.0000 0.0000 0.0000 0.0000 4/25/2006 0.0000 0.0000 0.0000 0.0000 4/26/2006 0.0000 0.0000 0.0000 0.0000 4/27/2006 0.0000 0.0000 0.0000 0.0000 4/28/2006 0.0000 0.0000 0.0000 0.0000 4/29/2006 0.0000 0.0000 0.0000 0.0000 4/30/2006 0.0000 0.0000 0.0000 0.0000 5/1/2006 0.0000 0.0000 0.0000 0.0000 5/2/2006 0.0000 0.0000 0.0000 0.0000 5/3/2006 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 6 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 5/4/2006 0.0000 0.0000 0.0000 0.0000 5/5/2006 0.0000 0.0000 0.0000 0.0000 5/6/2006 0.0000 0.0000 0.0000 0.0000 5/7/2006 0.0127 0.0127 0.0095 0.4892 5/8/2006 0.0000 0.0000 0.0000 0.0001 5/9/2006 0.0000 0.0000 0.0000 0.0000 5/10/2006 0.0000 0.0000 0.0000 0.0005 5/11/2006 0.0000 0.0000 0.0000 0.0000 5/12/2006 0.0000 0.0000 0.0000 0.0000 5/13/2006 0.0000 0.0000 0.0000 0.0000 5/14/2006 0.0000 0.0000 0.0000 0.0000 5/15/2006 0.0000 0.0000 0.0000 0.0000 5/16/2006 0.0000 0.0000 0.0000 0.0000 5/17/2006 0.0000 0.0000 0.0000 0.0000 5/18/2006 0.0000 0.0000 0.0000 0.0000 5/19/2006 0.0000 0.0000 0.0000 0.0000 5/20/2006 0.0000 0.0000 0.0000 0.0000 5/21/2006 0.0000 0.0000 0.0000 0.0000 5/22/2006 0.0315 0.0315 0.0263 1.3467 5/23/2006 0.0274 0.0274 0.0235 1.2046 5/24/2006 0.0123 0.0123 0.0134 0.6893 5/25/2006 0.0020 0.0020 0.0016 0.0812 5/26/2006 0.0000 0.0000 0.0001 0.0053 5/27/2006 0.0044 0.0044 0.0032 0.1628 5/28/2006 0.0000 0.0000 0.0000 0.0000 5/29/2006 0.0000 0.0000 0.0000 0.0000 5/30/2006 0.0000 0.0000 0.0000 0.0005 5/31/2006 0.0000 0.0000 0.0000 0.0000 6/1/2006 0.0389 0.0389 0.0319 1.6329 6/2/2006 0.0024 0.0024 0.0046 0.2369 6/3/2006 0.0000 0.0000 0.0000 0.0000 6/4/2006 0.0214 0.0214 0.0225 1.1508 6/5/2006 0.0000 0.0000 0.0000 0.0000 6/6/2006 0.0000 0.0000 0.0000 0.0000 6/7/2006 0.0000 0.0000 0.0000 0.0004 6/8/2006 0.0000 0.0000 0.0000 0.0000 6/9/2006 0.0000 0.0000 0.0000 0.0000 6/10/2006 0.0000 0.0000 0.0000 0.0000 6/11/2006 0.0000 0.0000 0.0000 0.0000 6/12/2006 0.0000 0.0000 0.0000 0.0000 6/13/2006 0.0000 0.0000 0.0000 0.0000 6/14/2006 0.0000 0.0000 0.0000 0.0000 6/15/2006 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 7 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 6/16/2006 0.0000 0.0000 0.0000 0.0000 6/17/2006 0.0000 0.0000 0.0000 0.0000 6/18/2006 0.0000 0.0000 0.0000 0.0000 6/19/2006 0.0000 0.0000 0.0000 0.0000 6/20/2006 0.0000 0.0000 0.0000 0.0000 6/21/2006 0.0000 0.0000 0.0000 0.0000 6/22/2006 0.0000 0.0000 0.0000 0.0000 6/23/2006 0.0000 0.0000 0.0000 0.0000 6/24/2006 0.0000 0.0000 0.0000 0.0000 6/25/2006 0.0000 0.0000 0.0000 0.0000 6/26/2006 0.0000 0.0000 0.0000 0.0000 6/27/2006 0.0000 0.0000 0.0000 0.0000 6/28/2006 0.0000 0.0000 0.0000 0.0000 6/29/2006 0.0000 0.0000 0.0000 0.0000 6/30/2006 0.0000 0.0000 0.0000 0.0000 7/1/2006 0.0000 0.0000 0.0000 0.0000 7/2/2006 0.0000 0.0000 0.0000 0.0000 7/3/2006 0.0000 0.0000 0.0000 0.0000 7/4/2006 0.0000 0.0000 0.0000 0.0000 7/5/2006 0.0000 0.0000 0.0000 0.0000 7/6/2006 0.0000 0.0000 0.0000 0.0000 7/7/2006 0.0000 0.0000 0.0000 0.0000 7/8/2006 0.0000 0.0000 0.0000 0.0000 7/9/2006 0.0000 0.0000 0.0000 0.0000 7/10/2006 0.0000 0.0000 0.0000 0.0000 7/11/2006 0.0000 0.0000 0.0000 0.0000 7/12/2006 0.0000 0.0000 0.0000 0.0000 7/13/2006 0.0000 0.0000 0.0000 0.0000 7/14/2006 0.0000 0.0000 0.0000 0.0000 7/15/2006 0.0000 0.0000 0.0000 0.0000 7/16/2006 0.0000 0.0000 0.0000 0.0000 7/17/2006 0.0000 0.0000 0.0000 0.0000 7/18/2006 0.0000 0.0000 0.0000 0.0000 7/19/2006 0.0000 0.0000 0.0000 0.0000 7/20/2006 0.0000 0.0000 0.0000 0.0000 7/21/2006 0.0000 0.0000 0.0000 0.0000 7/22/2006 0.0000 0.0000 0.0000 0.0000 7/23/2006 0.0000 0.0000 0.0000 0.0000 7/24/2006 0.0000 0.0000 0.0000 0.0000 7/25/2006 0.0000 0.0000 0.0000 0.0000 7/26/2006 0.0000 0.0000 0.0000 0.0000 7/27/2006 0.0000 0.0000 0.0000 0.0000 7/28/2006 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 8 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 7/29/2006 0.0000 0.0000 0.0000 0.0000 7/30/2006 0.0000 0.0000 0.0000 0.0000 7/31/2006 0.0000 0.0000 0.0000 0.0000 8/1/2006 0.0000 0.0000 0.0000 0.0000 8/2/2006 0.0000 0.0000 0.0000 0.0000 8/3/2006 0.0000 0.0000 0.0000 0.0000 8/4/2006 0.0000 0.0000 0.0000 0.0000 8/5/2006 0.0000 0.0000 0.0000 0.0000 8/6/2006 0.0000 0.0000 0.0000 0.0000 8/7/2006 0.0000 0.0000 0.0000 0.0000 8/8/2006 0.0000 0.0000 0.0000 0.0000 8/9/2006 0.0000 0.0000 0.0000 0.0000 8/10/2006 0.0000 0.0000 0.0000 0.0000 8/11/2006 0.0000 0.0000 0.0000 0.0000 8/12/2006 0.0000 0.0000 0.0000 0.0000 8/13/2006 0.0000 0.0000 0.0000 0.0000 8/14/2006 0.0000 0.0000 0.0000 0.0000 8/15/2006 0.0000 0.0000 0.0000 0.0000 8/16/2006 0.0000 0.0000 0.0000 0.0000 8/17/2006 0.0000 0.0000 0.0000 0.0000 8/18/2006 0.0000 0.0000 0.0000 0.0000 8/19/2006 0.0000 0.0000 0.0000 0.0000 8/20/2006 0.0000 0.0000 0.0000 0.0000 8/21/2006 0.0000 0.0000 0.0000 0.0000 8/22/2006 0.0000 0.0000 0.0000 0.0000 8/23/2006 0.0000 0.0000 0.0000 0.0000 8/24/2006 0.0000 0.0000 0.0000 0.0000 8/25/2006 0.0000 0.0000 0.0000 0.0000 8/26/2006 0.0000 0.0000 0.0000 0.0000 8/27/2006 0.0000 0.0000 0.0000 0.0000 8/28/2006 0.0000 0.0000 0.0000 0.0000 8/29/2006 0.0000 0.0000 0.0000 0.0000 8/30/2006 0.0000 0.0000 0.0000 0.0000 8/31/2006 0.0000 0.0000 0.0000 0.0000 9/1/2006 0.0000 0.0000 0.0000 0.0000 9/2/2006 0.0000 0.0000 0.0000 0.0000 9/3/2006 0.0000 0.0000 0.0000 0.0000 9/4/2006 0.0000 0.0000 0.0000 0.0000 9/5/2006 0.0000 0.0000 0.0000 0.0000 9/6/2006 0.0000 0.0000 0.0000 0.0000 9/7/2006 0.0000 0.0000 0.0000 0.0000 9/8/2006 0.0000 0.0000 0.0000 0.0000 9/9/2006 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 9 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 9/10/2006 0.0000 0.0000 0.0000 0.0000 9/11/2006 0.0000 0.0000 0.0000 0.0000 9/12/2006 0.0000 0.0000 0.0000 0.0000 9/13/2006 0.0000 0.0000 0.0000 0.0000 9/14/2006 0.0000 0.0000 0.0000 0.0000 9/15/2006 0.0000 0.0000 0.0000 0.0000 9/16/2006 0.0000 0.0000 0.0000 0.0000 9/17/2006 0.0000 0.0000 0.0000 0.0000 9/18/2006 0.0049 0.0049 0.0132 0.6755 9/19/2006 0.0001 0.0001 0.0001 0.0048 9/20/2006 0.0016 0.0016 0.0029 0.1503 9/21/2006 0.0000 0.0000 0.0008 0.0414 9/22/2006 0.0000 0.0000 0.0000 0.0000 9/23/2006 0.0000 0.0000 0.0000 0.0000 9/24/2006 0.0000 0.0000 0.0000 0.0005 9/25/2006 0.0000 0.0000 0.0000 0.0000 9/26/2006 0.0000 0.0000 0.0000 0.0000 9/27/2006 0.0000 0.0000 0.0000 0.0000 9/28/2006 0.0000 0.0000 0.0000 0.0000 9/29/2006 0.0000 0.0000 0.0000 0.0000 9/30/2006 0.0000 0.0000 0.0000 0.0000 10/1/2006 0.0000 0.0000 0.0000 0.0000 10/2/2006 0.0000 0.0000 0.0000 0.0000 10/3/2006 0.0000 0.0000 0.0000 0.0000 10/4/2006 0.0000 0.0000 0.0000 0.0000 10/5/2006 0.0000 0.0000 0.0000 0.0000 10/6/2006 0.0000 0.0000 0.0000 0.0000 10/7/2006 0.0000 0.0000 0.0000 0.0000 10/8/2006 0.0000 0.0000 0.0000 0.0000 10/9/2006 0.0000 0.0000 0.0000 0.0000 10/10/2006 0.0000 0.0000 0.0000 0.0000 10/11/2006 0.0000 0.0000 0.0000 0.0000 10/12/2006 0.0000 0.0000 0.0000 0.0000 10/13/2006 0.0000 0.0000 0.0000 0.0000 10/14/2006 0.0000 0.0000 0.0000 0.0000 10/15/2006 0.0118 0.0118 0.0338 1.7305 10/16/2006 0.0029 0.0029 0.0071 0.3642 10/17/2006 0.0000 0.0000 0.0000 0.0000 10/18/2006 0.0015 0.0015 0.0027 0.1397 10/19/2006 0.0028 0.0028 0.0065 0.3315 10/20/2006 0.0000 0.0000 0.0000 0.0000 10/21/2006 0.0000 0.0000 0.0000 0.0000 10/22/2006 0.0000 0.0000 0.0000 0.0006 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 10 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 10/23/2006 0.0000 0.0000 0.0000 0.0000 10/24/2006 0.0000 0.0000 0.0000 0.0000 10/25/2006 0.0000 0.0000 0.0000 0.0000 10/26/2006 0.0000 0.0000 0.0000 0.0000 10/27/2006 0.0000 0.0000 0.0000 0.0000 10/28/2006 0.0000 0.0000 0.0000 0.0000 10/29/2006 0.0000 0.0000 0.0000 0.0000 10/30/2006 0.0000 0.0000 0.0000 0.0000 10/31/2006 0.0000 0.0000 0.0000 0.0000 11/1/2006 0.0000 0.0000 0.0000 0.0000 11/2/2006 0.0258 0.0258 0.0431 2.2064 11/3/2006 0.0414 0.0414 0.0646 3.3097 11/4/2006 0.0659 0.0659 0.0897 4.5959 11/5/2006 0.0669 0.0669 0.0743 3.8066 11/6/2006 0.2424 0.2424 0.2556 13.1005 11/7/2006 0.0869 0.0869 0.0740 3.7929 11/8/2006 0.0227 0.0227 0.0177 0.9051 11/9/2006 0.0182 0.0182 0.0150 0.7661 11/10/2006 0.0769 0.0769 0.0653 3.3449 11/11/2006 0.0244 0.0244 0.0182 0.9316 11/12/2006 0.0822 0.0822 0.0700 3.5883 11/13/2006 0.0202 0.0202 0.0157 0.8062 11/14/2006 0.0016 0.0016 0.0003 0.0155 11/15/2006 0.0359 0.0359 0.0291 1.4888 11/16/2006 0.0015 0.0015 0.0007 0.0356 11/17/2006 0.0010 0.0010 0.0000 0.0000 11/18/2006 0.0007 0.0007 0.0000 0.0000 11/19/2006 0.0241 0.0241 0.0193 0.9904 11/20/2006 0.0320 0.0320 0.0255 1.3062 11/21/2006 0.0613 0.0613 0.0500 2.5630 11/22/2006 0.0494 0.0494 0.0374 1.9162 11/23/2006 0.0739 0.0739 0.0593 3.0375 11/24/2006 0.0165 0.0165 0.0133 0.6838 11/25/2006 0.0013 0.0013 0.0004 0.0182 11/26/2006 0.0494 0.0494 0.0384 1.9669 11/27/2006 0.0091 0.0091 0.0066 0.3357 11/28/2006 0.0060 0.0060 0.0046 0.2357 11/29/2006 0.0089 0.0089 0.0022 0.1139 11/30/2006 0.0278 0.0278 0.0261 1.3394 12/1/2006 0.0007 0.0007 0.0002 0.0107 12/2/2006 0.0006 0.0006 0.0000 0.0000 12/3/2006 0.0005 0.0005 0.0000 0.0000 12/4/2006 0.0012 0.0012 0.0004 0.0189 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 11 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 12/5/2006 0.0016 0.0016 0.0010 0.0494 12/6/2006 0.0003 0.0003 0.0000 0.0000 12/7/2006 0.0002 0.0002 0.0000 0.0000 12/8/2006 0.0002 0.0002 0.0000 0.0006 12/9/2006 0.0113 0.0113 0.0086 0.4426 12/10/2006 0.0197 0.0197 0.0147 0.7542 12/11/2006 0.0592 0.0592 0.0428 2.1933 12/12/2006 0.0330 0.0330 0.0260 1.3341 12/13/2006 0.0844 0.0844 0.0694 3.5554 12/14/2006 0.1119 0.1119 0.0919 4.7101 12/15/2006 0.0042 0.0042 0.0016 0.0840 12/16/2006 0.0018 0.0018 0.0001 0.0031 12/17/2006 0.0012 0.0012 0.0000 0.0000 12/18/2006 0.0009 0.0009 0.0000 0.0006 12/19/2006 0.0007 0.0007 0.0000 0.0000 12/20/2006 0.0229 0.0229 0.0147 0.7542 12/21/2006 0.0584 0.0584 0.0466 2.3884 12/22/2006 0.0012 0.0012 0.0012 0.0624 12/23/2006 0.0576 0.0576 0.0447 2.2919 12/24/2006 0.0757 0.0757 0.0540 2.7691 12/25/2006 0.0056 0.0056 0.0073 0.3750 12/26/2006 0.0942 0.0942 0.0670 3.4326 12/27/2006 0.0429 0.0429 0.0386 1.9788 12/28/2006 0.0018 0.0018 0.0000 0.0000 12/29/2006 0.0012 0.0012 0.0000 0.0000 12/30/2006 0.0009 0.0009 0.0000 0.0006 12/31/2006 0.0007 0.0007 0.0000 0.0000 1/1/2007 0.0078 0.0078 0.0044 0.2272 1/2/2007 0.0801 0.0801 0.0624 3.1966 1/3/2007 0.0227 0.0227 0.0165 0.8431 1/4/2007 0.0068 0.0068 0.0046 0.2376 1/5/2007 0.0929 0.0929 0.0647 3.3166 1/6/2007 0.0230 0.0230 0.0226 1.1586 1/7/2007 0.1214 0.1214 0.1082 5.5441 1/8/2007 0.0056 0.0056 0.0008 0.0430 1/9/2007 0.0185 0.0185 0.0126 0.6448 1/10/2007 0.0156 0.0156 0.0107 0.5501 1/11/2007 0.0027 0.0027 0.0014 0.0700 1/12/2007 0.0007 0.0007 0.0000 0.0000 1/13/2007 0.0006 0.0006 0.0000 0.0000 1/14/2007 0.0005 0.0005 0.0000 0.0005 1/15/2007 0.0004 0.0004 0.0000 0.0000 1/16/2007 0.0072 0.0072 0.0050 0.2541 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 12 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 1/17/2007 0.0026 0.0026 0.0004 0.0209 1/18/2007 0.0073 0.0073 0.0064 0.3290 1/19/2007 0.0192 0.0192 0.0123 0.6305 1/20/2007 0.0002 0.0002 0.0016 0.0819 1/21/2007 0.0002 0.0002 0.0000 0.0000 1/22/2007 0.0018 0.0018 0.0010 0.0530 1/23/2007 0.0004 0.0004 0.0001 0.0058 1/24/2007 0.0001 0.0001 0.0000 0.0000 1/25/2007 0.0001 0.0001 0.0000 0.0000 1/26/2007 0.0001 0.0001 0.0000 0.0006 1/27/2007 0.0001 0.0001 0.0000 0.0000 1/28/2007 0.0001 0.0001 0.0000 0.0000 1/29/2007 0.0000 0.0000 0.0000 0.0000 1/30/2007 0.0000 0.0000 0.0000 0.0000 1/31/2007 0.0000 0.0000 0.0000 0.0000 2/1/2007 0.0000 0.0000 0.0000 0.0000 2/2/2007 0.0000 0.0000 0.0000 0.0000 2/3/2007 0.0089 0.0089 0.0046 0.2363 2/4/2007 0.0020 0.0020 0.0033 0.1686 2/5/2007 0.0000 0.0000 0.0000 0.0000 2/6/2007 0.0006 0.0006 0.0003 0.0135 2/7/2007 0.0090 0.0090 0.0044 0.2243 2/8/2007 0.0008 0.0008 0.0027 0.1361 2/9/2007 0.0100 0.0100 0.0075 0.3830 2/10/2007 0.0040 0.0040 0.0018 0.0916 2/11/2007 0.0044 0.0044 0.0040 0.2045 2/12/2007 0.0002 0.0002 0.0004 0.0214 2/13/2007 0.0000 0.0000 0.0000 0.0000 2/14/2007 0.0221 0.0221 0.0161 0.8274 2/15/2007 0.0322 0.0322 0.0258 1.3235 2/16/2007 0.0017 0.0017 0.0010 0.0501 2/17/2007 0.0075 0.0075 0.0042 0.2152 2/18/2007 0.0070 0.0070 0.0066 0.3393 2/19/2007 0.0842 0.0842 0.0610 3.1245 2/20/2007 0.0718 0.0718 0.0602 3.0864 2/21/2007 0.0043 0.0043 0.0034 0.1748 2/22/2007 0.0011 0.0011 0.0003 0.0138 2/23/2007 0.0087 0.0087 0.0057 0.2901 2/24/2007 0.0236 0.0236 0.0172 0.8838 2/25/2007 0.0209 0.0209 0.0136 0.6985 2/26/2007 0.0045 0.0045 0.0047 0.2421 2/27/2007 0.0279 0.0279 0.0195 1.0003 2/28/2007 0.0090 0.0090 0.0063 0.3239 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 13 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 3/1/2007 0.0003 0.0003 0.0008 0.0403 3/2/2007 0.0134 0.0134 0.0085 0.4344 3/3/2007 0.0007 0.0007 0.0013 0.0675 3/4/2007 0.0002 0.0002 0.0000 0.0000 3/5/2007 0.0002 0.0002 0.0000 0.0000 3/6/2007 0.0001 0.0001 0.0000 0.0005 3/7/2007 0.0137 0.0137 0.0099 0.5082 3/8/2007 0.0181 0.0181 0.0128 0.6541 3/9/2007 0.0000 0.0000 0.0006 0.0309 3/10/2007 0.0548 0.0548 0.0358 1.8350 3/11/2007 0.1112 0.1112 0.0858 4.3960 3/12/2007 0.0147 0.0147 0.0149 0.7644 3/13/2007 0.0006 0.0006 0.0000 0.0000 3/14/2007 0.0005 0.0005 0.0000 0.0000 3/15/2007 0.0004 0.0004 0.0000 0.0005 3/16/2007 0.0003 0.0003 0.0000 0.0000 3/17/2007 0.0087 0.0087 0.0052 0.2672 3/18/2007 0.0022 0.0022 0.0025 0.1272 3/19/2007 0.0108 0.0108 0.0058 0.2954 3/20/2007 0.0220 0.0220 0.0188 0.9617 3/21/2007 0.0000 0.0000 0.0000 0.0000 3/22/2007 0.0000 0.0000 0.0000 0.0000 3/23/2007 0.0466 0.0466 0.0300 1.5388 3/24/2007 0.0963 0.0963 0.0735 3.7658 3/25/2007 0.0009 0.0009 0.0029 0.1484 3/26/2007 0.0138 0.0138 0.0074 0.3802 3/27/2007 0.0138 0.0138 0.0121 0.6218 3/28/2007 0.0003 0.0003 0.0000 0.0000 3/29/2007 0.0002 0.0002 0.0000 0.0000 3/30/2007 0.0000 0.0000 0.0000 0.0005 3/31/2007 0.0037 0.0037 0.0025 0.1258 4/1/2007 0.0000 0.0000 0.0000 0.0000 4/2/2007 0.0000 0.0000 0.0000 0.0000 4/3/2007 0.0000 0.0000 0.0000 0.0005 4/4/2007 0.0000 0.0000 0.0000 0.0000 4/5/2007 0.0000 0.0000 0.0000 0.0000 4/6/2007 0.0000 0.0000 0.0000 0.0000 4/7/2007 0.0200 0.0200 0.0178 0.9130 4/8/2007 0.0140 0.0140 0.0102 0.5231 4/9/2007 0.0266 0.0266 0.0217 1.1144 4/10/2007 0.0024 0.0024 0.0022 0.1121 4/11/2007 0.0000 0.0000 0.0001 0.0039 4/12/2007 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 14 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 4/13/2007 0.0062 0.0062 0.0042 0.2144 4/14/2007 0.0021 0.0021 0.0017 0.0867 4/15/2007 0.0000 0.0000 0.0000 0.0000 4/16/2007 0.0000 0.0000 0.0000 0.0000 4/17/2007 0.0000 0.0000 0.0000 0.0005 4/18/2007 0.0000 0.0000 0.0000 0.0000 4/19/2007 0.0000 0.0000 0.0000 0.0000 4/20/2007 0.0000 0.0000 0.0000 0.0000 4/21/2007 0.0067 0.0067 0.0046 0.2372 4/22/2007 0.0026 0.0026 0.0025 0.1273 4/23/2007 0.0000 0.0000 0.0000 0.0000 4/24/2007 0.0000 0.0000 0.0000 0.0000 4/25/2007 0.0000 0.0000 0.0000 0.0005 4/26/2007 0.0000 0.0000 0.0000 0.0000 4/27/2007 0.0000 0.0000 0.0000 0.0000 4/28/2007 0.0000 0.0000 0.0000 0.0000 4/29/2007 0.0000 0.0000 0.0000 0.0000 4/30/2007 0.0012 0.0012 0.0001 0.0045 5/1/2007 0.0087 0.0087 0.0072 0.3676 5/2/2007 0.0079 0.0079 0.0060 0.3097 5/3/2007 0.0000 0.0000 0.0000 0.0002 5/4/2007 0.0000 0.0000 0.0000 0.0000 5/5/2007 0.0000 0.0000 0.0000 0.0005 5/6/2007 0.0000 0.0000 0.0000 0.0000 5/7/2007 0.0000 0.0000 0.0000 0.0000 5/8/2007 0.0000 0.0000 0.0000 0.0000 5/9/2007 0.0000 0.0000 0.0000 0.0000 5/10/2007 0.0000 0.0000 0.0000 0.0000 5/11/2007 0.0000 0.0000 0.0000 0.0000 5/12/2007 0.0000 0.0000 0.0000 0.0000 5/13/2007 0.0000 0.0000 0.0000 0.0000 5/14/2007 0.0000 0.0000 0.0000 0.0000 5/15/2007 0.0000 0.0000 0.0000 0.0000 5/16/2007 0.0000 0.0000 0.0000 0.0000 5/17/2007 0.0000 0.0000 0.0000 0.0000 5/18/2007 0.0000 0.0000 0.0000 0.0000 5/19/2007 0.0000 0.0000 0.0000 0.0000 5/20/2007 0.0170 0.0170 0.0163 0.8363 5/21/2007 0.0000 0.0000 0.0005 0.0264 5/22/2007 0.0000 0.0000 0.0000 0.0000 5/23/2007 0.0000 0.0000 0.0000 0.0000 5/24/2007 0.0000 0.0000 0.0000 0.0005 5/25/2007 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 15 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 5/26/2007 0.0000 0.0000 0.0000 0.0000 5/27/2007 0.0000 0.0000 0.0000 0.0000 5/28/2007 0.0000 0.0000 0.0000 0.0000 5/29/2007 0.0000 0.0000 0.0000 0.0000 5/30/2007 0.0000 0.0000 0.0000 0.0000 5/31/2007 0.0000 0.0000 0.0000 0.0000 6/1/2007 0.0000 0.0000 0.0000 0.0000 6/2/2007 0.0000 0.0000 0.0000 0.0000 6/3/2007 0.0000 0.0000 0.0000 0.0000 6/4/2007 0.0000 0.0000 0.0000 0.0000 6/5/2007 0.0000 0.0000 0.0000 0.0000 6/6/2007 0.0000 0.0000 0.0000 0.0000 6/7/2007 0.0000 0.0000 0.0000 0.0000 6/8/2007 0.0000 0.0000 0.0000 0.0000 6/9/2007 0.0083 0.0083 0.0064 0.3275 6/10/2007 0.0000 0.0000 0.0000 0.0008 6/11/2007 0.0000 0.0000 0.0000 0.0000 6/12/2007 0.0000 0.0000 0.0000 0.0005 6/13/2007 0.0000 0.0000 0.0000 0.0000 6/14/2007 0.0000 0.0000 0.0000 0.0000 6/15/2007 0.0000 0.0000 0.0000 0.0000 6/16/2007 0.0000 0.0000 0.0000 0.0000 6/17/2007 0.0000 0.0000 0.0000 0.0000 6/18/2007 0.0000 0.0000 0.0000 0.0000 6/19/2007 0.0000 0.0000 0.0000 0.0000 6/20/2007 0.0000 0.0000 0.0000 0.0000 6/21/2007 0.0000 0.0000 0.0000 0.0000 6/22/2007 0.0000 0.0000 0.0000 0.0000 6/23/2007 0.0000 0.0000 0.0000 0.0000 6/24/2007 0.0161 0.0161 0.0128 0.6583 6/25/2007 0.0000 0.0000 0.0000 0.0003 6/26/2007 0.0000 0.0000 0.0000 0.0000 6/27/2007 0.0000 0.0000 0.0000 0.0005 6/28/2007 0.0101 0.0101 0.0080 0.4114 6/29/2007 0.0015 0.0015 0.0019 0.0988 6/30/2007 0.0000 0.0000 0.0000 0.0000 7/1/2007 0.0000 0.0000 0.0000 0.0000 7/2/2007 0.0000 0.0000 0.0000 0.0005 7/3/2007 0.0000 0.0000 0.0000 0.0000 7/4/2007 0.0000 0.0000 0.0000 0.0000 7/5/2007 0.0000 0.0000 0.0000 0.0000 7/6/2007 0.0000 0.0000 0.0000 0.0000 7/7/2007 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 16 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 7/8/2007 0.0000 0.0000 0.0000 0.0000 7/9/2007 0.0000 0.0000 0.0000 0.0000 7/10/2007 0.0000 0.0000 0.0000 0.0000 7/11/2007 0.0000 0.0000 0.0000 0.0000 7/12/2007 0.0000 0.0000 0.0000 0.0000 7/13/2007 0.0000 0.0000 0.0000 0.0000 7/14/2007 0.0000 0.0000 0.0000 0.0000 7/15/2007 0.0000 0.0000 0.0000 0.0000 7/16/2007 0.0000 0.0000 0.0000 0.0000 7/17/2007 0.0378 0.0378 0.0352 1.8047 7/18/2007 0.0063 0.0063 0.0052 0.2686 7/19/2007 0.0055 0.0055 0.0042 0.2160 7/20/2007 0.0133 0.0133 0.0121 0.6184 7/21/2007 0.0098 0.0098 0.0053 0.2701 7/22/2007 0.0242 0.0242 0.0238 1.2205 7/23/2007 0.0000 0.0000 0.0010 0.0510 7/24/2007 0.0000 0.0000 0.0000 0.0000 7/25/2007 0.0000 0.0000 0.0000 0.0000 7/26/2007 0.0000 0.0000 0.0000 0.0005 7/27/2007 0.0000 0.0000 0.0000 0.0000 7/28/2007 0.0000 0.0000 0.0000 0.0000 7/29/2007 0.0000 0.0000 0.0000 0.0000 7/30/2007 0.0000 0.0000 0.0000 0.0000 7/31/2007 0.0000 0.0000 0.0000 0.0000 8/1/2007 0.0000 0.0000 0.0000 0.0000 8/2/2007 0.0000 0.0000 0.0000 0.0000 8/3/2007 0.0000 0.0000 0.0000 0.0000 8/4/2007 0.0000 0.0000 0.0000 0.0000 8/5/2007 0.0000 0.0000 0.0000 0.0000 8/6/2007 0.0000 0.0000 0.0000 0.0000 8/7/2007 0.0000 0.0000 0.0000 0.0000 8/8/2007 0.0000 0.0000 0.0000 0.0000 8/9/2007 0.0000 0.0000 0.0000 0.0000 8/10/2007 0.0000 0.0000 0.0000 0.0000 8/11/2007 0.0000 0.0000 0.0000 0.0000 8/12/2007 0.0000 0.0000 0.0000 0.0000 8/13/2007 0.0000 0.0000 0.0000 0.0000 8/14/2007 0.0000 0.0000 0.0000 0.0000 8/15/2007 0.0000 0.0000 0.0000 0.0000 8/16/2007 0.0000 0.0000 0.0000 0.0000 8/17/2007 0.0000 0.0000 0.0000 0.0000 8/18/2007 0.0000 0.0000 0.0000 0.0000 8/19/2007 0.0138 0.0138 0.0139 0.7146 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 17 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 8/20/2007 0.0000 0.0000 0.0000 0.0000 8/21/2007 0.0000 0.0000 0.0000 0.0000 8/22/2007 0.0000 0.0000 0.0000 0.0005 8/23/2007 0.0000 0.0000 0.0000 0.0000 8/24/2007 0.0000 0.0000 0.0000 0.0000 8/25/2007 0.0000 0.0000 0.0000 0.0000 8/26/2007 0.0000 0.0000 0.0000 0.0000 8/27/2007 0.0000 0.0000 0.0000 0.0000 8/28/2007 0.0000 0.0000 0.0000 0.0000 8/29/2007 0.0000 0.0000 0.0000 0.0000 8/30/2007 0.0000 0.0000 0.0000 0.0000 8/31/2007 0.0000 0.0000 0.0000 0.0000 9/1/2007 0.0000 0.0000 0.0000 0.0000 9/2/2007 0.0000 0.0000 0.0000 0.0000 9/3/2007 0.0000 0.0000 0.0000 0.0000 9/4/2007 0.0183 0.0183 0.0213 1.0919 9/5/2007 0.0001 0.0001 0.0001 0.0068 9/6/2007 0.0000 0.0000 0.0000 0.0000 9/7/2007 0.0000 0.0000 0.0000 0.0000 9/8/2007 0.0000 0.0000 0.0000 0.0005 9/9/2007 0.0000 0.0000 0.0000 0.0000 9/10/2007 0.0000 0.0000 0.0000 0.0000 9/11/2007 0.0000 0.0000 0.0000 0.0000 9/12/2007 0.0000 0.0000 0.0000 0.0000 9/13/2007 0.0000 0.0000 0.0000 0.0000 9/14/2007 0.0000 0.0000 0.0000 0.0000 9/15/2007 0.0000 0.0000 0.0000 0.0000 9/16/2007 0.0000 0.0000 0.0000 0.0000 9/17/2007 0.0000 0.0000 0.0000 0.0000 9/18/2007 0.0000 0.0000 0.0000 0.0000 9/19/2007 0.0000 0.0000 0.0000 0.0000 9/20/2007 0.0000 0.0000 0.0000 0.0000 9/21/2007 0.0000 0.0000 0.0000 0.0000 9/22/2007 0.0000 0.0000 0.0000 0.0000 9/23/2007 0.0000 0.0000 0.0000 0.0000 9/24/2007 0.0000 0.0000 0.0000 0.0000 9/25/2007 0.0000 0.0000 0.0000 0.0000 9/26/2007 0.0000 0.0000 0.0000 0.0000 9/27/2007 0.0000 0.0000 0.0000 0.0000 9/28/2007 0.0015 0.0015 0.0016 0.0823 9/29/2007 0.0000 0.0000 0.0000 0.0000 9/30/2007 0.0162 0.0162 0.0199 1.0190 10/1/2007 0.0126 0.0126 0.0153 0.7826 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 18 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 10/2/2007 0.0017 0.0017 0.0018 0.0922 10/3/2007 0.0085 0.0085 0.0104 0.5351 10/4/2007 0.0045 0.0045 0.0049 0.2490 10/5/2007 0.0000 0.0000 0.0005 0.0245 10/6/2007 0.0097 0.0097 0.0086 0.4415 10/7/2007 0.0188 0.0188 0.0234 1.1992 10/8/2007 0.0028 0.0028 0.0034 0.1733 10/9/2007 0.0000 0.0000 0.0000 0.0000 10/10/2007 0.0043 0.0043 0.0036 0.1852 10/11/2007 0.0001 0.0001 0.0009 0.0446 10/12/2007 0.0000 0.0000 0.0000 0.0000 10/13/2007 0.0000 0.0000 0.0000 0.0000 10/14/2007 0.0000 0.0000 0.0000 0.0006 10/15/2007 0.0000 0.0000 0.0000 0.0000 10/16/2007 0.0037 0.0037 0.0035 0.1815 10/17/2007 0.0199 0.0199 0.0218 1.1194 10/18/2007 0.0265 0.0265 0.0271 1.3886 10/19/2007 0.0148 0.0148 0.0120 0.6141 10/20/2007 0.0283 0.0283 0.0323 1.6571 10/21/2007 0.0054 0.0054 0.0046 0.2358 10/22/2007 0.0015 0.0015 0.0034 0.1727 10/23/2007 0.0000 0.0000 0.0000 0.0000 10/24/2007 0.0000 0.0000 0.0000 0.0000 10/25/2007 0.0000 0.0000 0.0000 0.0006 10/26/2007 0.0000 0.0000 0.0000 0.0000 10/27/2007 0.0000 0.0000 0.0000 0.0000 10/28/2007 0.0000 0.0000 0.0000 0.0000 10/29/2007 0.0000 0.0000 0.0000 0.0000 10/30/2007 0.0000 0.0000 0.0000 0.0000 10/31/2007 0.0000 0.0000 0.0000 0.0000 11/1/2007 0.0000 0.0000 0.0000 0.0000 11/2/2007 0.0000 0.0000 0.0000 0.0000 11/3/2007 0.0000 0.0000 0.0000 0.0000 11/4/2007 0.0000 0.0000 0.0000 0.0000 11/5/2007 0.0000 0.0000 0.0000 0.0000 11/6/2007 0.0000 0.0000 0.0000 0.0000 11/7/2007 0.0000 0.0000 0.0000 0.0000 11/8/2007 0.0000 0.0000 0.0000 0.0000 11/9/2007 0.0044 0.0044 0.0039 0.1975 11/10/2007 0.0193 0.0193 0.0197 1.0092 11/11/2007 0.0030 0.0030 0.0027 0.1392 11/12/2007 0.0678 0.0678 0.0740 3.7916 11/13/2007 0.0003 0.0003 0.0008 0.0400 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 19 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 11/14/2007 0.0037 0.0037 0.0017 0.0848 11/15/2007 0.0191 0.0191 0.0170 0.8710 11/16/2007 0.0498 0.0498 0.0541 2.7739 11/17/2007 0.0402 0.0402 0.0393 2.0132 11/18/2007 0.0000 0.0000 0.0005 0.0268 11/19/2007 0.0000 0.0000 0.0000 0.0000 11/20/2007 0.0000 0.0000 0.0000 0.0000 11/21/2007 0.0000 0.0000 0.0000 0.0006 11/22/2007 0.0000 0.0000 0.0000 0.0000 11/23/2007 0.0000 0.0000 0.0000 0.0000 11/24/2007 0.0000 0.0000 0.0000 0.0000 11/25/2007 0.0000 0.0000 0.0000 0.0000 11/26/2007 0.0078 0.0078 0.0050 0.2552 11/27/2007 0.0010 0.0010 0.0027 0.1395 11/28/2007 0.0133 0.0133 0.0101 0.5190 11/29/2007 0.0191 0.0191 0.0184 0.9420 11/30/2007 0.0000 0.0000 0.0000 0.0015 12/1/2007 0.0253 0.0253 0.0201 1.0305 12/2/2007 0.1621 0.1621 0.1539 7.8858 12/3/2007 0.3260 0.3260 0.3096 15.8667 12/4/2007 0.0309 0.0309 0.0212 1.0870 12/5/2007 0.0026 0.0026 0.0000 0.0023 12/6/2007 0.0015 0.0015 0.0000 0.0000 12/7/2007 0.0010 0.0010 0.0000 0.0006 12/8/2007 0.0008 0.0008 0.0000 0.0000 12/9/2007 0.0006 0.0006 0.0000 0.0000 12/10/2007 0.0005 0.0005 0.0000 0.0000 12/11/2007 0.0003 0.0003 0.0000 0.0000 12/12/2007 0.0001 0.0001 0.0000 0.0000 12/13/2007 0.0001 0.0001 0.0000 0.0000 12/14/2007 0.0000 0.0000 0.0000 0.0000 12/15/2007 0.0000 0.0000 0.0000 0.0000 12/16/2007 0.0000 0.0000 0.0000 0.0000 12/17/2007 0.0000 0.0000 0.0000 0.0000 12/18/2007 0.0000 0.0000 0.0000 0.0000 12/19/2007 0.0000 0.0000 0.0000 0.0000 12/20/2007 0.0000 0.0000 0.0000 0.0000 12/21/2007 0.0000 0.0000 0.0000 0.0000 12/22/2007 0.0000 0.0000 0.0000 0.0000 12/23/2007 0.0000 0.0000 0.0000 0.0000 12/24/2007 0.0000 0.0000 0.0000 0.0000 12/25/2007 0.0000 0.0000 0.0000 0.0000 12/26/2007 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 20 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 12/27/2007 0.0000 0.0000 0.0000 0.0000 12/28/2007 0.0000 0.0000 0.0000 0.0000 12/29/2007 0.0000 0.0000 0.0000 0.0000 12/30/2007 0.0000 0.0000 0.0000 0.0000 12/31/2007 0.0000 0.0000 0.0000 0.0000 1/1/2008 0.0000 0.0000 0.0000 0.0000 1/2/2008 0.0176 0.0176 0.0135 0.6913 1/3/2008 0.0259 0.0259 0.0213 1.0893 1/4/2008 0.0259 0.0259 0.0166 0.8497 1/5/2008 0.0618 0.0618 0.0554 2.8394 1/6/2008 0.0077 0.0077 0.0061 0.3145 1/7/2008 0.0003 0.0003 0.0002 0.0115 1/8/2008 0.0436 0.0436 0.0340 1.7417 1/9/2008 0.0227 0.0227 0.0144 0.7393 1/10/2008 0.0848 0.0848 0.0720 3.6912 1/11/2008 0.0120 0.0120 0.0120 0.6129 1/12/2008 0.0251 0.0251 0.0199 1.0189 1/13/2008 0.0000 0.0000 0.0000 0.0005 1/14/2008 0.0228 0.0228 0.0178 0.9108 1/15/2008 0.0000 0.0000 0.0001 0.0069 1/16/2008 0.0000 0.0000 0.0000 0.0000 1/17/2008 0.0000 0.0000 0.0000 0.0005 1/18/2008 0.0000 0.0000 0.0000 0.0000 1/19/2008 0.0008 0.0008 0.0004 0.0192 1/20/2008 0.0007 0.0007 0.0004 0.0181 1/21/2008 0.0000 0.0000 0.0000 0.0000 1/22/2008 0.0000 0.0000 0.0000 0.0000 1/23/2008 0.0000 0.0000 0.0000 0.0005 1/24/2008 0.0000 0.0000 0.0000 0.0000 1/25/2008 0.0000 0.0000 0.0000 0.0000 1/26/2008 0.0043 0.0043 0.0017 0.0877 1/27/2008 0.0019 0.0019 0.0028 0.1428 1/28/2008 0.0014 0.0014 0.0001 0.0047 1/29/2008 0.0352 0.0352 0.0274 1.4056 1/30/2008 0.0340 0.0340 0.0232 1.1891 1/31/2008 0.0471 0.0471 0.0378 1.9389 2/1/2008 0.0218 0.0218 0.0189 0.9702 2/2/2008 0.0081 0.0081 0.0064 0.3296 2/3/2008 0.0000 0.0000 0.0001 0.0028 2/4/2008 0.0000 0.0000 0.0000 0.0000 2/5/2008 0.0374 0.0374 0.0286 1.4637 2/6/2008 0.0553 0.0553 0.0399 2.0470 2/7/2008 0.0449 0.0449 0.0367 1.8792 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 21 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 2/8/2008 0.0596 0.0596 0.0446 2.2850 2/9/2008 0.0041 0.0041 0.0044 0.2232 2/10/2008 0.0126 0.0126 0.0087 0.4469 2/11/2008 0.0003 0.0003 0.0004 0.0205 2/12/2008 0.0009 0.0009 0.0003 0.0158 2/13/2008 0.0002 0.0002 0.0000 0.0000 2/14/2008 0.0002 0.0002 0.0000 0.0000 2/15/2008 0.0002 0.0002 0.0000 0.0005 2/16/2008 0.0002 0.0002 0.0000 0.0000 2/17/2008 0.0001 0.0001 0.0000 0.0000 2/18/2008 0.0000 0.0000 0.0000 0.0000 2/19/2008 0.0000 0.0000 0.0000 0.0000 2/20/2008 0.0000 0.0000 0.0000 0.0000 2/21/2008 0.0000 0.0000 0.0000 0.0000 2/22/2008 0.0000 0.0000 0.0000 0.0000 2/23/2008 0.0000 0.0000 0.0000 0.0000 2/24/2008 0.0000 0.0000 0.0000 0.0000 2/25/2008 0.0000 0.0000 0.0000 0.0000 2/26/2008 0.0000 0.0000 0.0000 0.0000 2/27/2008 0.0000 0.0000 0.0000 0.0000 2/28/2008 0.0000 0.0000 0.0000 0.0000 2/29/2008 0.0102 0.0102 0.0072 0.3700 3/1/2008 0.0172 0.0172 0.0140 0.7168 3/2/2008 0.0000 0.0000 0.0000 0.0000 3/3/2008 0.0088 0.0088 0.0065 0.3319 3/4/2008 0.0000 0.0000 0.0000 0.0019 3/5/2008 0.0000 0.0000 0.0000 0.0000 3/6/2008 0.0000 0.0000 0.0000 0.0005 3/7/2008 0.0000 0.0000 0.0000 0.0000 3/8/2008 0.0000 0.0000 0.0000 0.0000 3/9/2008 0.0000 0.0000 0.0000 0.0000 3/10/2008 0.0054 0.0054 0.0036 0.1870 3/11/2008 0.0151 0.0151 0.0120 0.6161 3/12/2008 0.0000 0.0000 0.0000 0.0000 3/13/2008 0.0476 0.0476 0.0347 1.7798 3/14/2008 0.0183 0.0183 0.0160 0.8217 3/15/2008 0.0025 0.0025 0.0021 0.1053 3/16/2008 0.0000 0.0000 0.0000 0.0000 3/17/2008 0.0035 0.0035 0.0024 0.1210 3/18/2008 0.0000 0.0000 0.0000 0.0011 3/19/2008 0.0000 0.0000 0.0000 0.0000 3/20/2008 0.0069 0.0069 0.0044 0.2253 3/21/2008 0.0113 0.0113 0.0093 0.4764 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 22 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 3/22/2008 0.0000 0.0000 0.0002 0.0078 3/23/2008 0.0542 0.0542 0.0434 2.2250 3/24/2008 0.0000 0.0000 0.0004 0.0202 3/25/2008 0.0164 0.0164 0.0071 0.3642 3/26/2008 0.0248 0.0248 0.0248 1.2697 3/27/2008 0.0013 0.0013 0.0013 0.0679 3/28/2008 0.0179 0.0179 0.0119 0.6106 3/29/2008 0.0000 0.0000 0.0013 0.0690 3/30/2008 0.0000 0.0000 0.0000 0.0000 3/31/2008 0.0000 0.0000 0.0000 0.0000 4/1/2008 0.0000 0.0000 0.0000 0.0005 4/2/2008 0.0000 0.0000 0.0000 0.0000 4/3/2008 0.0000 0.0000 0.0000 0.0000 4/4/2008 0.0000 0.0000 0.0000 0.0000 4/5/2008 0.0000 0.0000 0.0000 0.0000 4/6/2008 0.0081 0.0081 0.0058 0.2952 4/7/2008 0.0056 0.0056 0.0042 0.2143 4/8/2008 0.0013 0.0013 0.0008 0.0400 4/9/2008 0.0000 0.0000 0.0000 0.0000 4/10/2008 0.0000 0.0000 0.0000 0.0000 4/11/2008 0.0000 0.0000 0.0000 0.0005 4/12/2008 0.0000 0.0000 0.0000 0.0000 4/13/2008 0.0000 0.0000 0.0000 0.0000 4/14/2008 0.0000 0.0000 0.0000 0.0000 4/15/2008 0.0000 0.0000 0.0000 0.0000 4/16/2008 0.0000 0.0000 0.0000 0.0000 4/17/2008 0.0000 0.0000 0.0000 0.0000 4/18/2008 0.0000 0.0000 0.0000 0.0000 4/19/2008 0.0049 0.0049 0.0033 0.1711 4/20/2008 0.0000 0.0000 0.0001 0.0044 4/21/2008 0.0000 0.0000 0.0000 0.0000 4/22/2008 0.0000 0.0000 0.0000 0.0005 4/23/2008 0.0066 0.0066 0.0051 0.2592 4/24/2008 0.0000 0.0000 0.0000 0.0000 4/25/2008 0.0000 0.0000 0.0000 0.0000 4/26/2008 0.0000 0.0000 0.0000 0.0005 4/27/2008 0.0026 0.0026 0.0015 0.0757 4/28/2008 0.0100 0.0100 0.0079 0.4045 4/29/2008 0.0007 0.0007 0.0004 0.0180 4/30/2008 0.0000 0.0000 0.0000 0.0000 5/1/2008 0.0000 0.0000 0.0000 0.0000 5/2/2008 0.0000 0.0000 0.0000 0.0005 5/3/2008 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 23 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 5/4/2008 0.0000 0.0000 0.0000 0.0000 5/5/2008 0.0000 0.0000 0.0000 0.0000 5/6/2008 0.0000 0.0000 0.0000 0.0000 5/7/2008 0.0000 0.0000 0.0000 0.0000 5/8/2008 0.0000 0.0000 0.0000 0.0000 5/9/2008 0.0000 0.0000 0.0000 0.0000 5/10/2008 0.0000 0.0000 0.0000 0.0000 5/11/2008 0.0000 0.0000 0.0000 0.0000 5/12/2008 0.0000 0.0000 0.0000 0.0000 5/13/2008 0.0000 0.0000 0.0000 0.0000 5/14/2008 0.0000 0.0000 0.0000 0.0000 5/15/2008 0.0000 0.0000 0.0000 0.0000 5/16/2008 0.0000 0.0000 0.0000 0.0000 5/17/2008 0.0000 0.0000 0.0000 0.0000 5/18/2008 0.0000 0.0000 0.0000 0.0000 5/19/2008 0.0000 0.0000 0.0000 0.0000 5/20/2008 0.0063 0.0063 0.0047 0.2430 5/21/2008 0.0000 0.0000 0.0000 0.0000 5/22/2008 0.0000 0.0000 0.0000 0.0000 5/23/2008 0.0000 0.0000 0.0000 0.0005 5/24/2008 0.0000 0.0000 0.0000 0.0000 5/25/2008 0.0000 0.0000 0.0000 0.0000 5/26/2008 0.0000 0.0000 0.0000 0.0000 5/27/2008 0.0000 0.0000 0.0000 0.0000 5/28/2008 0.0000 0.0000 0.0000 0.0000 5/29/2008 0.0000 0.0000 0.0000 0.0000 5/30/2008 0.0000 0.0000 0.0000 0.0000 5/31/2008 0.0000 0.0000 0.0000 0.0000 6/1/2008 0.0000 0.0000 0.0000 0.0000 6/2/2008 0.0000 0.0000 0.0000 0.0000 6/3/2008 0.0314 0.0314 0.0257 1.3154 6/4/2008 0.0000 0.0000 0.0000 0.0000 6/5/2008 0.0000 0.0000 0.0000 0.0000 6/6/2008 0.0000 0.0000 0.0000 0.0004 6/7/2008 0.0000 0.0000 0.0000 0.0000 6/8/2008 0.0000 0.0000 0.0000 0.0000 6/9/2008 0.0000 0.0000 0.0000 0.0000 6/10/2008 0.0000 0.0000 0.0000 0.0000 6/11/2008 0.0000 0.0000 0.0000 0.0000 6/12/2008 0.0000 0.0000 0.0000 0.0000 6/13/2008 0.0000 0.0000 0.0000 0.0000 6/14/2008 0.0000 0.0000 0.0000 0.0000 6/15/2008 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 24 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 6/16/2008 0.0000 0.0000 0.0000 0.0000 6/17/2008 0.0000 0.0000 0.0000 0.0000 6/18/2008 0.0000 0.0000 0.0000 0.0000 6/19/2008 0.0000 0.0000 0.0000 0.0000 6/20/2008 0.0000 0.0000 0.0000 0.0000 6/21/2008 0.0000 0.0000 0.0000 0.0000 6/22/2008 0.0000 0.0000 0.0000 0.0000 6/23/2008 0.0000 0.0000 0.0000 0.0000 6/24/2008 0.0000 0.0000 0.0000 0.0000 6/25/2008 0.0000 0.0000 0.0000 0.0000 6/26/2008 0.0000 0.0000 0.0000 0.0000 6/27/2008 0.0000 0.0000 0.0000 0.0000 6/28/2008 0.0000 0.0000 0.0000 0.0000 6/29/2008 0.0000 0.0000 0.0000 0.0000 6/30/2008 0.0000 0.0000 0.0000 0.0000 7/1/2008 0.0000 0.0000 0.0000 0.0000 7/2/2008 0.0000 0.0000 0.0000 0.0000 7/3/2008 0.0000 0.0000 0.0000 0.0000 7/4/2008 0.0000 0.0000 0.0000 0.0000 7/5/2008 0.0000 0.0000 0.0000 0.0000 7/6/2008 0.0000 0.0000 0.0000 0.0000 7/7/2008 0.0000 0.0000 0.0000 0.0000 7/8/2008 0.0000 0.0000 0.0000 0.0000 7/9/2008 0.0000 0.0000 0.0000 0.0000 7/10/2008 0.0000 0.0000 0.0000 0.0000 7/11/2008 0.0000 0.0000 0.0000 0.0000 7/12/2008 0.0000 0.0000 0.0000 0.0000 7/13/2008 0.0000 0.0000 0.0000 0.0000 7/14/2008 0.0000 0.0000 0.0000 0.0000 7/15/2008 0.0000 0.0000 0.0000 0.0000 7/16/2008 0.0000 0.0000 0.0000 0.0000 7/17/2008 0.0000 0.0000 0.0000 0.0000 7/18/2008 0.0000 0.0000 0.0000 0.0000 7/19/2008 0.0000 0.0000 0.0000 0.0000 7/20/2008 0.0000 0.0000 0.0000 0.0000 7/21/2008 0.0000 0.0000 0.0000 0.0000 7/22/2008 0.0000 0.0000 0.0000 0.0000 7/23/2008 0.0000 0.0000 0.0000 0.0000 7/24/2008 0.0000 0.0000 0.0000 0.0000 7/25/2008 0.0000 0.0000 0.0000 0.0000 7/26/2008 0.0000 0.0000 0.0000 0.0000 7/27/2008 0.0000 0.0000 0.0000 0.0000 7/28/2008 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 25 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 7/29/2008 0.0000 0.0000 0.0000 0.0000 7/30/2008 0.0000 0.0000 0.0000 0.0000 7/31/2008 0.0000 0.0000 0.0000 0.0000 8/1/2008 0.0000 0.0000 0.0000 0.0000 8/2/2008 0.0000 0.0000 0.0000 0.0000 8/3/2008 0.0000 0.0000 0.0000 0.0000 8/4/2008 0.0000 0.0000 0.0000 0.0000 8/5/2008 0.0000 0.0000 0.0000 0.0000 8/6/2008 0.0000 0.0000 0.0000 0.0000 8/7/2008 0.0000 0.0000 0.0000 0.0000 8/8/2008 0.0000 0.0000 0.0000 0.0000 8/9/2008 0.0000 0.0000 0.0000 0.0000 8/10/2008 0.0000 0.0000 0.0000 0.0000 8/11/2008 0.0000 0.0000 0.0000 0.0000 8/12/2008 0.0000 0.0000 0.0000 0.0000 8/13/2008 0.0000 0.0000 0.0000 0.0000 8/14/2008 0.0000 0.0000 0.0000 0.0000 8/15/2008 0.0000 0.0000 0.0000 0.0000 8/16/2008 0.0000 0.0000 0.0000 0.0000 8/17/2008 0.0000 0.0000 0.0000 0.0000 8/18/2008 0.0000 0.0000 0.0000 0.0000 8/19/2008 0.0057 0.0057 0.0087 0.4454 8/20/2008 0.0116 0.0116 0.0227 1.1653 8/21/2008 0.0000 0.0000 0.0001 0.0037 8/22/2008 0.0000 0.0000 0.0000 0.0000 8/23/2008 0.0000 0.0000 0.0000 0.0005 8/24/2008 0.0077 0.0077 0.0126 0.6475 8/25/2008 0.0000 0.0000 0.0002 0.0082 8/26/2008 0.0000 0.0000 0.0000 0.0000 8/27/2008 0.0027 0.0027 0.0040 0.2059 8/28/2008 0.0000 0.0000 0.0000 0.0000 8/29/2008 0.0000 0.0000 0.0000 0.0000 8/30/2008 0.0006 0.0006 0.0006 0.0302 8/31/2008 0.0000 0.0000 0.0001 0.0028 9/1/2008 0.0000 0.0000 0.0000 0.0000 9/2/2008 0.0000 0.0000 0.0000 0.0005 9/3/2008 0.0000 0.0000 0.0000 0.0000 9/4/2008 0.0000 0.0000 0.0000 0.0000 9/5/2008 0.0000 0.0000 0.0000 0.0000 9/6/2008 0.0000 0.0000 0.0000 0.0000 9/7/2008 0.0000 0.0000 0.0000 0.0000 9/8/2008 0.0000 0.0000 0.0000 0.0000 9/9/2008 0.0000 0.0000 0.0000 0.0000 ATTACHMENT 2 Model Recharge Rates Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 26 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att2_Recharge Rate Calcs Landau Associates Date Volume (acre-ft) (a) Rate (ft/day) (b) Volume (acre-ft) (c) Rate (ft/day) (d) Pre-Developed Recharge Developed Facility Recharge 9/10/2008 0.0000 0.0000 0.0000 0.0000 9/11/2008 0.0000 0.0000 0.0000 0.0000 9/12/2008 0.0000 0.0000 0.0000 0.0000 9/13/2008 0.0000 0.0000 0.0000 0.0000 9/14/2008 0.0000 0.0000 0.0000 0.0000 9/15/2008 0.0000 0.0000 0.0000 0.0000 9/16/2008 0.0000 0.0000 0.0000 0.0000 9/17/2008 0.0000 0.0000 0.0000 0.0000 9/18/2008 0.0000 0.0000 0.0000 0.0000 9/19/2008 0.0000 0.0000 0.0000 0.0000 9/20/2008 0.0000 0.0000 0.0000 0.0000 9/21/2008 0.0000 0.0000 0.0000 0.0000 9/22/2008 0.0000 0.0000 0.0000 0.0000 9/23/2008 0.0000 0.0000 0.0000 0.0000 9/24/2008 0.0000 0.0000 0.0000 0.0000 9/25/2008 0.0000 0.0000 0.0000 0.0000 9/26/2008 0.0000 0.0000 0.0000 0.0000 9/27/2008 0.0000 0.0000 0.0000 0.0000 9/28/2008 0.0000 0.0000 0.0000 0.0000 9/29/2008 0.0000 0.0000 0.0000 0.0000 9/30/2008 0.0000 0.0000 0.0000 0.0000 Notes: Abbreviations and Acronyms: ft = foot/feet SF = square foot/feet WWHM = Western Washington Hydrology Model (d) Developed recharge rate is calculated from the developed recharge volume divided by an 850 SF infiltration facility area, assuming a high (i.e., non-limiting) design infiltration rate. (a) Pre-developed recharge volume is derived from WWHM calculated recharge for 1 acre of flat lawn ground cover. (b) Pre-developed recharge rate is calculated by dividing the pre-developed recharge volume by 1 acre (for units of ft per day) and applied uniformly across the model domain for the pre-developed condition simulation and everywhere except the facility and the proposed impervious area in the developed condition simulation. (c) Developed recharge volume is derived from WWHM calculated recharge for 30,000 SF of impervious land cover representing the proposed additional impervious area. ATTACHMENT 3 Model Mass Balance ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 1 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 10/1/2005 0.0780 4.60E-03 1.21E-03 1.20E-03 3.41E-03 10/2/2005 0.2425 1.43E-02 1.16E-02 1.16E-02 2.75E-03 10/3/2005 0.1363 8.04E-03 6.39E-03 6.35E-03 1.69E-03 10/4/2005 0.0000 0.00E+00 2.82E-04 2.18E-04 0.00E+00 10/5/2005 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 10/6/2005 0.2132 1.26E-02 6.67E-03 6.84E-03 5.74E-03 10/7/2005 0.4789 2.83E-02 2.55E-02 2.55E-02 2.72E-03 10/8/2005 0.1850 1.09E-02 8.24E-03 8.20E-03 2.72E-03 10/9/2005 0.0189 1.11E-03 1.08E-03 1.02E-03 9.19E-05 10/10/2005 0.0386 2.28E-03 3.46E-05 0.00E+00 2.28E-03 10/11/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/12/2005 0.0875 5.17E-03 0.00E+00 4.78E-05 5.12E-03 10/13/2005 0.1361 8.03E-03 7.73E-03 7.80E-03 2.36E-04 10/14/2005 0.1667 9.84E-03 3.88E-03 3.94E-03 5.90E-03 10/15/2005 0.4015 2.37E-02 2.36E-02 2.36E-02 8.15E-05 10/16/2005 0.0111 6.53E-04 2.62E-04 1.98E-04 4.56E-04 10/17/2005 0.0275 1.62E-03 0.00E+00 0.00E+00 1.62E-03 10/18/2005 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 10/19/2005 0.2468 1.46E-02 8.83E-03 9.08E-03 5.48E-03 10/20/2005 0.0000 0.00E+00 4.28E-04 3.64E-04 0.00E+00 10/21/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/22/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/23/2005 0.2048 1.21E-02 4.79E-03 5.06E-03 7.03E-03 10/24/2005 0.0000 0.00E+00 1.02E-04 2.90E-05 0.00E+00 10/25/2005 0.1860 1.10E-02 4.72E-03 4.82E-03 6.15E-03 10/26/2005 0.0000 0.00E+00 1.53E-03 1.47E-03 0.00E+00 10/27/2005 0.1174 6.93E-03 2.03E-03 2.09E-03 4.83E-03 10/28/2005 0.3359 1.98E-02 1.66E-02 1.66E-02 3.23E-03 10/29/2005 0.1423 8.40E-03 8.58E-03 8.58E-03 0.00E+00 10/30/2005 0.1773 1.05E-02 3.64E-03 3.68E-03 6.79E-03 10/31/2005 1.8970 1.12E-01 1.10E-01 1.10E-01 2.26E-03 11/1/2005 0.0484 2.86E-03 2.92E-03 2.83E-03 2.38E-05 11/2/2005 0.1945 1.15E-02 9.34E-03 9.22E-03 2.26E-03 11/3/2005 0.3711 2.19E-02 2.09E-02 2.09E-02 9.74E-04 11/4/2005 1.0177 6.01E-02 5.56E-02 5.57E-02 4.38E-03 11/5/2005 0.9888 5.84E-02 5.62E-02 5.62E-02 2.17E-03 11/6/2005 0.3034 1.79E-02 1.61E-02 1.61E-02 1.79E-03 11/7/2005 0.1465 8.65E-03 9.34E-03 9.29E-03 0.00E+00 11/8/2005 0.0386 2.28E-03 1.12E-03 1.04E-03 1.24E-03 11/9/2005 0.0000 0.00E+00 2.47E-05 0.00E+00 0.00E+00 11/10/2005 0.0480 2.83E-03 9.94E-05 1.20E-04 2.71E-03 11/11/2005 0.5690 3.36E-02 3.07E-02 3.07E-02 2.88E-03 11/12/2005 0.2143 1.26E-02 9.99E-03 1.00E-02 2.61E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 2 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 11/13/2005 0.4893 2.89E-02 2.89E-02 2.89E-02 0.00E+00 11/14/2005 0.0000 0.00E+00 1.05E-04 8.90E-06 0.00E+00 11/15/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/16/2005 0.0000 0.00E+00 0.00E+00 1.12E-05 0.00E+00 11/17/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/18/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/19/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/20/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/21/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/22/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/23/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/24/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/25/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/26/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/27/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/28/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/29/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/30/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/1/2005 0.4811 2.84E-02 1.53E-02 1.64E-02 1.20E-02 12/2/2005 0.3021 1.78E-02 2.20E-02 2.19E-02 0.00E+00 12/3/2005 0.0094 5.56E-04 1.65E-05 0.00E+00 5.56E-04 12/4/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/5/2005 0.0000 0.00E+00 0.00E+00 1.09E-05 0.00E+00 12/6/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/7/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/8/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/9/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/10/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/11/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/12/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/13/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/14/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/15/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/16/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/17/2005 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/18/2005 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 12/19/2005 0.4004 2.36E-02 1.39E-02 1.47E-02 8.91E-03 12/20/2005 0.3683 2.17E-02 2.09E-02 2.09E-02 7.99E-04 12/21/2005 0.6186 3.65E-02 3.42E-02 3.42E-02 2.30E-03 12/22/2005 0.6594 3.89E-02 3.73E-02 3.73E-02 1.61E-03 12/23/2005 1.3376 7.89E-02 7.27E-02 7.28E-02 6.11E-03 12/24/2005 0.4577 2.70E-02 3.01E-02 3.00E-02 0.00E+00 12/25/2005 1.0615 6.26E-02 5.77E-02 5.77E-02 4.96E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 3 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 12/26/2005 0.5458 3.22E-02 3.21E-02 3.22E-02 6.07E-05 12/27/2005 0.2814 1.66E-02 1.56E-02 1.56E-02 1.01E-03 12/28/2005 0.8159 4.82E-02 4.32E-02 4.32E-02 4.93E-03 12/29/2005 0.3517 2.08E-02 1.67E-02 1.68E-02 3.99E-03 12/30/2005 0.9209 5.44E-02 5.48E-02 5.48E-02 0.00E+00 12/31/2005 0.4686 2.77E-02 2.72E-02 2.72E-02 4.35E-04 1/1/2006 0.2020 1.19E-02 1.04E-02 1.05E-02 1.45E-03 1/2/2006 0.2917 1.72E-02 1.58E-02 1.59E-02 1.35E-03 1/3/2006 0.3222 1.90E-02 1.41E-02 1.41E-02 4.92E-03 1/4/2006 0.0376 2.22E-03 4.66E-03 4.57E-03 0.00E+00 1/5/2006 0.8729 5.15E-02 4.65E-02 4.66E-02 4.93E-03 1/6/2006 0.2124 1.25E-02 1.14E-02 1.15E-02 1.08E-03 1/7/2006 0.5163 3.05E-02 2.74E-02 2.74E-02 3.06E-03 1/8/2006 0.0664 3.92E-03 3.90E-03 3.86E-03 5.42E-05 1/9/2006 1.5451 9.12E-02 7.74E-02 7.76E-02 1.36E-02 1/10/2006 1.7854 1.05E-01 1.06E-01 1.06E-01 0.00E+00 1/11/2006 0.5268 3.11E-02 3.31E-02 3.31E-02 0.00E+00 1/12/2006 0.7720 4.56E-02 4.28E-02 4.28E-02 2.81E-03 1/13/2006 0.5540 3.27E-02 2.96E-02 2.97E-02 3.00E-03 1/14/2006 0.0873 5.15E-03 5.74E-03 5.67E-03 0.00E+00 1/15/2006 0.0771 4.55E-03 2.61E-03 2.59E-03 1.96E-03 1/16/2006 1.3253 7.82E-02 6.88E-02 6.89E-02 9.32E-03 1/17/2006 0.2362 1.39E-02 1.89E-02 1.87E-02 0.00E+00 1/18/2006 0.2031 1.20E-02 9.63E-03 9.63E-03 2.35E-03 1/19/2006 0.0971 5.73E-03 1.17E-03 1.12E-03 4.61E-03 1/20/2006 0.8833 5.21E-02 5.25E-02 5.25E-02 0.00E+00 1/21/2006 0.0377 2.23E-03 1.02E-03 9.16E-04 1.31E-03 1/22/2006 0.0000 0.00E+00 6.34E-05 0.00E+00 0.00E+00 1/23/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/24/2006 0.0000 0.00E+00 0.00E+00 1.07E-05 0.00E+00 1/25/2006 0.0975 5.75E-03 0.00E+00 3.36E-05 5.72E-03 1/26/2006 0.4759 2.81E-02 2.41E-02 2.43E-02 3.78E-03 1/27/2006 0.3798 2.24E-02 2.07E-02 2.07E-02 1.72E-03 1/28/2006 0.8176 4.83E-02 4.58E-02 4.58E-02 2.44E-03 1/29/2006 1.8277 1.08E-01 9.81E-02 9.83E-02 9.60E-03 1/30/2006 1.3769 8.13E-02 8.45E-02 8.45E-02 0.00E+00 1/31/2006 0.6156 3.63E-02 3.22E-02 3.23E-02 4.06E-03 2/1/2006 0.3833 2.26E-02 1.95E-02 1.96E-02 3.07E-03 2/2/2006 0.8979 5.30E-02 5.21E-02 5.21E-02 9.08E-04 2/3/2006 0.1256 7.41E-03 5.11E-03 5.08E-03 2.33E-03 2/4/2006 0.9002 5.31E-02 5.09E-02 5.09E-02 2.18E-03 2/5/2006 0.0283 1.67E-03 2.08E-03 2.01E-03 0.00E+00 2/6/2006 0.0000 0.00E+00 3.38E-06 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 4 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 2/7/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/8/2006 0.0471 2.78E-03 0.00E+00 1.10E-05 2.77E-03 2/9/2006 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 2/10/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/12/2006 0.0189 1.11E-03 0.00E+00 0.00E+00 1.11E-03 2/13/2006 0.0866 5.11E-03 0.00E+00 0.00E+00 5.11E-03 2/14/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/15/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/16/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/17/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/18/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/19/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/20/2006 0.0668 3.95E-03 0.00E+00 0.00E+00 3.95E-03 2/21/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/22/2006 0.0382 2.26E-03 0.00E+00 0.00E+00 2.26E-03 2/23/2006 0.4073 2.40E-02 1.79E-02 1.92E-02 4.83E-03 2/24/2006 0.0000 0.00E+00 1.24E-04 3.66E-05 0.00E+00 2/25/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/26/2006 0.1551 9.15E-03 2.88E-03 3.02E-03 6.13E-03 2/27/2006 0.2406 1.42E-02 1.14E-02 1.14E-02 2.76E-03 2/28/2006 0.3822 2.26E-02 2.27E-02 2.27E-02 0.00E+00 3/1/2006 0.0094 5.56E-04 5.82E-04 5.47E-04 9.24E-06 3/2/2006 0.0488 2.88E-03 0.00E+00 0.00E+00 2.88E-03 3/3/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/4/2006 0.0000 0.00E+00 0.00E+00 9.95E-06 0.00E+00 3/5/2006 0.1080 6.37E-03 0.00E+00 9.76E-05 6.28E-03 3/6/2006 0.0778 4.59E-03 0.00E+00 2.85E-05 4.56E-03 3/7/2006 0.0474 2.80E-03 9.61E-04 1.19E-03 1.61E-03 3/8/2006 0.7070 4.17E-02 3.64E-02 3.65E-02 5.26E-03 3/9/2006 0.4584 2.71E-02 2.36E-02 2.36E-02 3.41E-03 3/10/2006 0.2065 1.22E-02 8.18E-03 8.16E-03 4.02E-03 3/11/2006 0.1268 7.49E-03 8.22E-03 8.21E-03 0.00E+00 3/12/2006 0.0000 0.00E+00 8.28E-06 0.00E+00 0.00E+00 3/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/14/2006 0.1465 8.65E-03 1.09E-03 1.42E-03 7.23E-03 3/15/2006 0.1866 1.10E-02 8.39E-03 8.39E-03 2.62E-03 3/16/2006 0.1845 1.09E-02 8.88E-03 8.96E-03 1.93E-03 3/17/2006 0.2648 1.56E-02 1.19E-02 1.19E-02 3.74E-03 3/18/2006 0.0000 0.00E+00 2.54E-04 2.07E-04 0.00E+00 3/19/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/20/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/21/2006 0.0470 2.78E-03 0.00E+00 9.97E-06 2.77E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 5 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 3/22/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/23/2006 0.0189 1.11E-03 0.00E+00 0.00E+00 1.11E-03 3/24/2006 0.2940 1.73E-02 9.06E-03 9.79E-03 7.56E-03 3/25/2006 0.0000 0.00E+00 1.27E-05 0.00E+00 0.00E+00 3/26/2006 0.1268 7.49E-03 1.72E-03 1.88E-03 5.61E-03 3/27/2006 0.0000 0.00E+00 5.37E-05 0.00E+00 0.00E+00 3/28/2006 0.0471 2.78E-03 0.00E+00 0.00E+00 2.78E-03 3/29/2006 0.0000 0.00E+00 0.00E+00 9.95E-06 0.00E+00 3/30/2006 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 3/31/2006 0.2570 1.52E-02 2.54E-03 3.19E-03 1.20E-02 4/1/2006 0.1158 6.83E-03 1.10E-02 1.10E-02 0.00E+00 4/2/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/3/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/4/2006 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 4/5/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/6/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/7/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/8/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/9/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/10/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/12/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/14/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/15/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/16/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/17/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/18/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/19/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/20/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/21/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/22/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/23/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/24/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/25/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/26/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/27/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/28/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/29/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/30/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/1/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/2/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/3/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 6 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 5/4/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/5/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/6/2006 0.0106 6.26E-04 0.00E+00 0.00E+00 6.26E-04 5/7/2006 0.3202 1.89E-02 1.37E-03 9.55E-03 9.35E-03 5/8/2006 0.0000 0.00E+00 2.06E-05 2.86E-06 0.00E+00 5/9/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/10/2006 0.0000 0.00E+00 0.00E+00 9.02E-06 0.00E+00 5/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/12/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/14/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/15/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/16/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/17/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/18/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/19/2006 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 5/20/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/21/2006 0.0883 5.21E-03 0.00E+00 0.00E+00 5.21E-03 5/22/2006 0.5879 3.47E-02 2.17E-02 2.63E-02 8.42E-03 5/23/2006 0.5291 3.12E-02 2.34E-02 2.35E-02 7.72E-03 5/24/2006 0.3124 1.84E-02 1.33E-02 1.34E-02 4.99E-03 5/25/2006 0.1166 6.88E-03 1.48E-03 1.58E-03 5.29E-03 5/26/2006 0.0874 5.16E-03 1.08E-04 1.03E-04 5.06E-03 5/27/2006 0.1457 8.60E-03 2.86E-03 3.18E-03 5.42E-03 5/28/2006 0.0000 0.00E+00 2.20E-06 0.00E+00 0.00E+00 5/29/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/30/2006 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 5/31/2006 0.0208 1.23E-03 0.00E+00 0.00E+00 1.23E-03 6/1/2006 0.7863 4.64E-02 3.03E-02 3.19E-02 1.45E-02 6/2/2006 0.0960 5.67E-03 4.53E-03 4.62E-03 1.05E-03 6/3/2006 0.0006 3.56E-05 6.72E-09 0.00E+00 3.56E-05 6/4/2006 0.5417 3.20E-02 2.20E-02 2.25E-02 9.51E-03 6/5/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/6/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/7/2006 0.0000 0.00E+00 0.00E+00 8.72E-06 0.00E+00 6/8/2006 0.0110 6.52E-04 0.00E+00 0.00E+00 6.52E-04 6/9/2006 0.0172 1.02E-03 0.00E+00 0.00E+00 1.02E-03 6/10/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/12/2006 0.0085 5.01E-04 0.00E+00 0.00E+00 5.01E-04 6/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/14/2006 0.0295 1.74E-03 0.00E+00 0.00E+00 1.74E-03 6/15/2006 0.0279 1.64E-03 0.00E+00 0.00E+00 1.64E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 7 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 6/16/2006 0.1071 6.32E-03 0.00E+00 0.00E+00 6.32E-03 6/17/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/18/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/19/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/20/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/21/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/22/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/23/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/24/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/25/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/26/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/27/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/28/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/29/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/30/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/1/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/2/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/3/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/4/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/5/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/6/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/7/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/8/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/9/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/10/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/12/2006 0.0874 5.16E-03 0.00E+00 0.00E+00 5.16E-03 7/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/14/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/15/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/16/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/17/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/18/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/19/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/20/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/21/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/22/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/23/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/24/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/25/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/26/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/27/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/28/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 8 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 7/29/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/30/2006 0.0583 3.44E-03 0.00E+00 0.00E+00 3.44E-03 7/31/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/1/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/2/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/3/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/4/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/5/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/6/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/7/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/8/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/9/2006 0.1268 7.49E-03 0.00E+00 0.00E+00 7.49E-03 8/10/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/12/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/14/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/15/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/16/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/17/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/18/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/19/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/20/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/21/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/22/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/23/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/24/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/25/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/26/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/27/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/28/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/29/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/30/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/31/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/1/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/2/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/3/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/4/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/5/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/6/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/7/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/8/2006 0.0071 4.17E-04 0.00E+00 0.00E+00 4.17E-04 9/9/2006 0.0118 6.95E-04 0.00E+00 0.00E+00 6.95E-04 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 9 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 9/10/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/12/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/14/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/15/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/16/2006 0.0283 1.67E-03 0.00E+00 0.00E+00 1.67E-03 9/17/2006 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 9/18/2006 0.3634 2.14E-02 0.00E+00 1.32E-02 8.26E-03 9/19/2006 0.0574 3.39E-03 0.00E+00 9.44E-05 3.29E-03 9/20/2006 0.1945 1.15E-02 0.00E+00 2.93E-03 8.55E-03 9/21/2006 0.0000 0.00E+00 0.00E+00 8.08E-04 0.00E+00 9/22/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/23/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/24/2006 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 9/25/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/26/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/27/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/28/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/29/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/30/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/1/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/2/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/3/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/4/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/5/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/6/2006 0.0968 5.72E-03 0.00E+00 0.00E+00 5.72E-03 10/7/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/8/2006 0.0480 2.83E-03 0.00E+00 0.00E+00 2.83E-03 10/9/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/10/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/11/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/12/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/13/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/14/2006 0.0296 1.75E-03 0.00E+00 0.00E+00 1.75E-03 10/15/2006 0.6955 4.10E-02 1.20E-02 3.38E-02 7.28E-03 10/16/2006 0.1277 7.54E-03 7.15E-03 7.11E-03 4.29E-04 10/17/2006 0.0000 0.00E+00 4.87E-07 0.00E+00 0.00E+00 10/18/2006 0.1463 8.63E-03 2.59E-03 2.73E-03 5.91E-03 10/19/2006 0.1168 6.90E-03 6.49E-03 6.47E-03 4.28E-04 10/20/2006 0.0000 0.00E+00 8.73E-06 0.00E+00 0.00E+00 10/21/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/22/2006 0.0000 0.00E+00 0.00E+00 1.09E-05 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 10 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 10/23/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/24/2006 0.0488 2.88E-03 0.00E+00 0.00E+00 2.88E-03 10/25/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/26/2006 0.0002 8.90E-06 0.00E+00 0.00E+00 8.90E-06 10/27/2006 0.0281 1.66E-03 0.00E+00 0.00E+00 1.66E-03 10/28/2006 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 10/29/2006 0.0591 3.49E-03 0.00E+00 0.00E+00 3.49E-03 10/30/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/31/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/1/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/2/2006 1.0021 5.91E-02 4.16E-02 4.31E-02 1.61E-02 11/3/2006 1.0649 6.29E-02 6.46E-02 6.46E-02 0.00E+00 11/4/2006 1.5392 9.08E-02 8.97E-02 8.97E-02 1.16E-03 11/5/2006 1.4684 8.67E-02 7.41E-02 7.43E-02 1.24E-02 11/6/2006 4.3816 2.59E-01 2.56E-01 2.56E-01 2.96E-03 11/7/2006 1.2596 7.43E-02 7.40E-02 7.40E-02 3.30E-04 11/8/2006 0.3233 1.91E-02 1.77E-02 1.77E-02 1.42E-03 11/9/2006 0.2585 1.53E-02 1.49E-02 1.50E-02 3.04E-04 11/10/2006 1.1767 6.94E-02 6.52E-02 6.53E-02 4.17E-03 11/11/2006 0.3433 2.03E-02 1.82E-02 1.82E-02 2.08E-03 11/12/2006 1.2430 7.34E-02 7.00E-02 7.00E-02 3.34E-03 11/13/2006 0.2631 1.55E-02 1.57E-02 1.57E-02 0.00E+00 11/14/2006 0.0000 0.00E+00 3.98E-04 3.02E-04 0.00E+00 11/15/2006 0.5587 3.30E-02 2.90E-02 2.91E-02 3.92E-03 11/16/2006 0.0000 0.00E+00 7.84E-04 6.94E-04 0.00E+00 11/17/2006 0.0000 0.00E+00 2.10E-07 0.00E+00 0.00E+00 11/18/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/19/2006 0.4122 2.43E-02 1.92E-02 1.93E-02 5.00E-03 11/20/2006 0.4985 2.94E-02 2.55E-02 2.55E-02 3.94E-03 11/21/2006 0.8931 5.27E-02 5.00E-02 5.00E-02 2.70E-03 11/22/2006 0.6921 4.08E-02 3.73E-02 3.74E-02 3.46E-03 11/23/2006 1.0265 6.06E-02 5.93E-02 5.93E-02 1.31E-03 11/24/2006 0.2197 1.30E-02 1.33E-02 1.33E-02 0.00E+00 11/25/2006 0.0094 5.56E-04 4.43E-04 3.56E-04 2.00E-04 11/26/2006 0.7244 4.28E-02 3.83E-02 3.84E-02 4.37E-03 11/27/2006 0.1248 7.37E-03 6.54E-03 6.55E-03 8.16E-04 11/28/2006 0.0754 4.45E-03 4.68E-03 4.60E-03 0.00E+00 11/29/2006 0.1522 8.98E-03 2.15E-03 2.22E-03 6.76E-03 11/30/2006 0.3955 2.33E-02 2.62E-02 2.61E-02 0.00E+00 12/1/2006 0.0000 0.00E+00 3.04E-04 2.09E-04 0.00E+00 12/2/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/3/2006 0.0094 5.56E-04 0.00E+00 0.00E+00 5.56E-04 12/4/2006 0.0659 3.89E-03 2.52E-04 3.70E-04 3.52E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 11 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 12/5/2006 0.0291 1.72E-03 1.09E-03 9.63E-04 7.56E-04 12/6/2006 0.0000 0.00E+00 5.73E-05 0.00E+00 0.00E+00 12/7/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/8/2006 0.0283 1.67E-03 0.00E+00 1.12E-05 1.66E-03 12/9/2006 0.1937 1.14E-02 8.52E-03 8.64E-03 2.79E-03 12/10/2006 0.2873 1.70E-02 1.48E-02 1.47E-02 2.24E-03 12/11/2006 0.8502 5.02E-02 4.27E-02 4.28E-02 7.38E-03 12/12/2006 0.4682 2.76E-02 2.60E-02 2.60E-02 1.60E-03 12/13/2006 1.1504 6.79E-02 6.94E-02 6.94E-02 0.00E+00 12/14/2006 1.6189 9.55E-02 9.19E-02 9.19E-02 3.64E-03 12/15/2006 0.0268 1.58E-03 1.74E-03 1.64E-03 0.00E+00 12/16/2006 0.0000 0.00E+00 1.59E-04 6.02E-05 0.00E+00 12/17/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/18/2006 0.0000 0.00E+00 0.00E+00 1.09E-05 0.00E+00 12/19/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/20/2006 0.3822 2.26E-02 1.45E-02 1.47E-02 7.84E-03 12/21/2006 0.8009 4.73E-02 4.66E-02 4.66E-02 6.64E-04 12/22/2006 0.0094 5.56E-04 1.31E-03 1.22E-03 0.00E+00 12/23/2006 0.8047 4.75E-02 4.47E-02 4.47E-02 2.77E-03 12/24/2006 1.0428 6.15E-02 5.40E-02 5.40E-02 7.51E-03 12/25/2006 0.0576 3.40E-03 7.44E-03 7.32E-03 0.00E+00 12/26/2006 1.3783 8.13E-02 6.67E-02 6.70E-02 1.44E-02 12/27/2006 0.4952 2.92E-02 3.90E-02 3.86E-02 0.00E+00 12/28/2006 0.0000 0.00E+00 2.14E-05 0.00E+00 0.00E+00 12/29/2006 0.0368 2.17E-03 0.00E+00 0.00E+00 2.17E-03 12/30/2006 0.0000 0.00E+00 0.00E+00 1.09E-05 0.00E+00 12/31/2006 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/1/2007 0.1557 9.19E-03 4.22E-03 4.43E-03 4.75E-03 1/2/2007 1.1058 6.53E-02 6.23E-02 6.24E-02 2.89E-03 1/3/2007 0.3008 1.78E-02 1.64E-02 1.65E-02 1.30E-03 1/4/2007 0.0874 5.16E-03 4.68E-03 4.64E-03 5.23E-04 1/5/2007 1.3028 7.69E-02 6.46E-02 6.47E-02 1.22E-02 1/6/2007 0.3000 1.77E-02 2.28E-02 2.26E-02 0.00E+00 1/7/2007 1.8947 1.12E-01 1.08E-01 1.08E-01 3.64E-03 1/8/2007 0.0471 2.78E-03 9.18E-04 8.39E-04 1.94E-03 1/9/2007 0.2348 1.39E-02 1.26E-02 1.26E-02 1.28E-03 1/10/2007 0.2023 1.19E-02 1.07E-02 1.07E-02 1.20E-03 1/11/2007 0.0377 2.23E-03 1.45E-03 1.37E-03 8.59E-04 1/12/2007 0.0000 0.00E+00 2.51E-05 0.00E+00 0.00E+00 1/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/14/2007 0.0000 0.00E+00 0.00E+00 1.07E-05 0.00E+00 1/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/16/2007 0.1954 1.15E-02 4.75E-03 4.96E-03 6.57E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 12 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 1/17/2007 0.0652 3.85E-03 4.29E-04 4.08E-04 3.44E-03 1/18/2007 0.0994 5.86E-03 6.48E-03 6.42E-03 0.00E+00 1/19/2007 0.2811 1.66E-02 1.23E-02 1.23E-02 4.29E-03 1/20/2007 0.0000 0.00E+00 1.68E-03 1.60E-03 0.00E+00 1/21/2007 0.0283 1.67E-03 1.32E-07 0.00E+00 1.67E-03 1/22/2007 0.0478 2.82E-03 1.03E-03 1.03E-03 1.79E-03 1/23/2007 0.0172 1.02E-03 2.10E-04 1.14E-04 9.03E-04 1/24/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/25/2007 0.0283 1.67E-03 0.00E+00 0.00E+00 1.67E-03 1/26/2007 0.0000 0.00E+00 0.00E+00 1.11E-05 0.00E+00 1/27/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/28/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/30/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/31/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/1/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/2/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/3/2007 0.2259 1.33E-02 3.81E-03 4.61E-03 8.72E-03 2/4/2007 0.0278 1.64E-03 3.37E-03 3.29E-03 0.00E+00 2/5/2007 0.0000 0.00E+00 1.38E-06 0.00E+00 0.00E+00 2/6/2007 0.0677 4.00E-03 1.87E-04 2.64E-04 3.73E-03 2/7/2007 0.1456 8.59E-03 4.48E-03 4.38E-03 4.21E-03 2/8/2007 0.0173 1.02E-03 2.74E-03 2.66E-03 0.00E+00 2/9/2007 0.1568 9.26E-03 7.52E-03 7.47E-03 1.78E-03 2/10/2007 0.0883 5.21E-03 1.79E-03 1.79E-03 3.42E-03 2/11/2007 0.0771 4.55E-03 3.98E-03 3.99E-03 5.62E-04 2/12/2007 0.0094 5.56E-04 4.93E-04 4.17E-04 1.39E-04 2/13/2007 0.0085 5.01E-04 0.00E+00 0.00E+00 5.01E-04 2/14/2007 0.3531 2.08E-02 1.60E-02 1.61E-02 4.69E-03 2/15/2007 0.4582 2.70E-02 2.58E-02 2.58E-02 1.22E-03 2/16/2007 0.0480 2.83E-03 1.06E-03 9.78E-04 1.85E-03 2/17/2007 0.1276 7.53E-03 4.27E-03 4.20E-03 3.33E-03 2/18/2007 0.1163 6.86E-03 6.63E-03 6.62E-03 2.44E-04 2/19/2007 1.1754 6.94E-02 6.09E-02 6.10E-02 8.40E-03 2/20/2007 0.9887 5.84E-02 6.03E-02 6.02E-02 0.00E+00 2/21/2007 0.0533 3.15E-03 3.47E-03 3.41E-03 0.00E+00 2/22/2007 0.0294 1.73E-03 3.61E-04 2.69E-04 1.47E-03 2/23/2007 0.1446 8.53E-03 5.63E-03 5.66E-03 2.87E-03 2/24/2007 0.3214 1.90E-02 1.72E-02 1.72E-02 1.72E-03 2/25/2007 0.2910 1.72E-02 1.36E-02 1.36E-02 3.55E-03 2/26/2007 0.0630 3.72E-03 4.78E-03 4.72E-03 0.00E+00 2/27/2007 0.3916 2.31E-02 1.95E-02 1.95E-02 3.60E-03 2/28/2007 0.1354 7.99E-03 6.28E-03 6.32E-03 1.67E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 13 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 3/1/2007 0.0000 0.00E+00 8.36E-04 7.86E-04 0.00E+00 3/2/2007 0.2537 1.50E-02 8.38E-03 8.48E-03 6.49E-03 3/3/2007 0.0094 5.56E-04 1.36E-03 1.32E-03 0.00E+00 3/4/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/5/2007 0.0291 1.72E-03 0.00E+00 0.00E+00 1.72E-03 3/6/2007 0.0000 0.00E+00 0.00E+00 9.97E-06 0.00E+00 3/7/2007 0.2940 1.73E-02 9.45E-03 9.92E-03 7.43E-03 3/8/2007 0.2931 1.73E-02 1.28E-02 1.28E-02 4.53E-03 3/9/2007 0.0000 0.00E+00 6.41E-04 6.03E-04 0.00E+00 3/10/2007 0.8209 4.84E-02 3.56E-02 3.58E-02 1.26E-02 3/11/2007 1.5185 8.96E-02 8.57E-02 8.58E-02 3.84E-03 3/12/2007 0.1845 1.09E-02 1.50E-02 1.49E-02 0.00E+00 3/13/2007 0.0235 1.39E-03 0.00E+00 0.00E+00 1.39E-03 3/14/2007 0.0433 2.56E-03 0.00E+00 0.00E+00 2.56E-03 3/15/2007 0.0094 5.56E-04 0.00E+00 9.95E-06 5.46E-04 3/16/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/17/2007 0.2245 1.33E-02 4.58E-03 5.21E-03 8.04E-03 3/18/2007 0.0386 2.28E-03 2.51E-03 2.48E-03 0.00E+00 3/19/2007 0.2143 1.26E-02 5.66E-03 5.76E-03 6.88E-03 3/20/2007 0.3042 1.80E-02 1.88E-02 1.88E-02 0.00E+00 3/21/2007 0.0000 0.00E+00 9.60E-08 0.00E+00 0.00E+00 3/22/2007 0.0591 3.49E-03 0.00E+00 0.00E+00 3.49E-03 3/23/2007 0.6991 4.13E-02 2.96E-02 3.00E-02 1.12E-02 3/24/2007 1.2934 7.63E-02 7.34E-02 7.35E-02 2.85E-03 3/25/2007 0.0086 5.06E-04 2.94E-03 2.90E-03 0.00E+00 3/26/2007 0.2562 1.51E-02 7.29E-03 7.42E-03 7.70E-03 3/27/2007 0.1843 1.09E-02 1.22E-02 1.21E-02 0.00E+00 3/28/2007 0.0000 0.00E+00 6.81E-07 0.00E+00 0.00E+00 3/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/30/2007 0.0386 2.28E-03 0.00E+00 9.95E-06 2.27E-03 3/31/2007 0.1363 8.04E-03 2.06E-03 2.45E-03 5.59E-03 4/1/2007 0.0094 5.56E-04 5.11E-06 0.00E+00 5.56E-04 4/2/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/3/2007 0.0000 0.00E+00 0.00E+00 9.57E-06 0.00E+00 4/4/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/5/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/7/2007 0.4611 2.72E-02 1.65E-02 1.78E-02 9.39E-03 4/8/2007 0.2638 1.56E-02 1.02E-02 1.02E-02 5.36E-03 4/9/2007 0.4395 2.59E-02 2.16E-02 2.17E-02 4.19E-03 4/10/2007 0.0780 4.60E-03 2.16E-03 2.19E-03 2.42E-03 4/11/2007 0.0677 4.00E-03 1.09E-04 7.64E-05 3.92E-03 4/12/2007 0.0189 1.11E-03 0.00E+00 0.00E+00 1.11E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 14 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 4/13/2007 0.1851 1.09E-02 3.76E-03 4.18E-03 6.74E-03 4/14/2007 0.0583 3.44E-03 1.68E-03 1.69E-03 1.75E-03 4/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/16/2007 0.0883 5.21E-03 0.00E+00 0.00E+00 5.21E-03 4/17/2007 0.0394 2.33E-03 0.00E+00 9.56E-06 2.32E-03 4/18/2007 0.0394 2.33E-03 0.00E+00 0.00E+00 2.33E-03 4/19/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/20/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/21/2007 0.2156 1.27E-02 3.18E-03 4.63E-03 8.10E-03 4/22/2007 0.0569 3.36E-03 2.45E-03 2.48E-03 8.72E-04 4/23/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/24/2007 0.0583 3.44E-03 0.00E+00 0.00E+00 3.44E-03 4/25/2007 0.0197 1.16E-03 0.00E+00 9.57E-06 1.15E-03 4/26/2007 0.0423 2.50E-03 0.00E+00 0.00E+00 2.50E-03 4/27/2007 0.0151 8.90E-04 0.00E+00 0.00E+00 8.90E-04 4/28/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/30/2007 0.1286 7.59E-03 0.00E+00 8.75E-05 7.50E-03 5/1/2007 0.1448 8.54E-03 5.56E-03 7.17E-03 1.37E-03 5/2/2007 0.2708 1.60E-02 5.90E-03 6.04E-03 9.94E-03 5/3/2007 0.0111 6.58E-04 2.01E-05 3.41E-06 6.54E-04 5/4/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/5/2007 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 5/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/7/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/8/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/9/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/10/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/11/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/12/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/14/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/16/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/17/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/18/2007 0.0471 2.78E-03 0.00E+00 0.00E+00 2.78E-03 5/19/2007 0.0223 1.32E-03 0.00E+00 0.00E+00 1.32E-03 5/20/2007 0.4362 2.57E-02 1.07E-02 1.63E-02 9.43E-03 5/21/2007 0.0000 0.00E+00 5.00E-04 5.15E-04 0.00E+00 5/22/2007 0.0240 1.42E-03 0.00E+00 0.00E+00 1.42E-03 5/23/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/24/2007 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 5/25/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 15 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 5/26/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/27/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/28/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/30/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/31/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/1/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/2/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/3/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/4/2007 0.0711 4.20E-03 0.00E+00 0.00E+00 4.20E-03 6/5/2007 0.0703 4.15E-03 0.00E+00 0.00E+00 4.15E-03 6/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/7/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/8/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/9/2007 0.2481 1.46E-02 0.00E+00 6.39E-03 8.25E-03 6/10/2007 0.0218 1.29E-03 0.00E+00 1.64E-05 1.27E-03 6/11/2007 0.0463 2.73E-03 0.00E+00 0.00E+00 2.73E-03 6/12/2007 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 6/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/14/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/16/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/17/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/18/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/19/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/20/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/21/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/22/2007 0.0823 4.86E-03 0.00E+00 0.00E+00 4.86E-03 6/23/2007 0.0240 1.42E-03 0.00E+00 0.00E+00 1.42E-03 6/24/2007 0.4145 2.45E-02 7.06E-03 1.28E-02 1.16E-02 6/25/2007 0.0097 5.73E-04 2.04E-05 5.69E-06 5.67E-04 6/26/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/27/2007 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 6/28/2007 0.3188 1.88E-02 6.67E-03 8.03E-03 1.08E-02 6/29/2007 0.1063 6.27E-03 1.80E-03 1.93E-03 4.34E-03 6/30/2007 0.0000 0.00E+00 4.62E-06 0.00E+00 0.00E+00 7/1/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/2/2007 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 7/3/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/4/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/5/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/7/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 16 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 7/8/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/9/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/10/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/11/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/12/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/14/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/16/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/17/2007 0.7799 4.60E-02 2.73E-02 3.52E-02 1.08E-02 7/18/2007 0.2357 1.39E-02 5.03E-03 5.24E-03 8.67E-03 7/19/2007 0.2245 1.33E-02 3.97E-03 4.22E-03 9.04E-03 7/20/2007 0.3433 2.03E-02 1.19E-02 1.21E-02 8.19E-03 7/21/2007 0.3103 1.83E-02 4.97E-03 5.27E-03 1.30E-02 7/22/2007 0.5136 3.03E-02 2.36E-02 2.38E-02 6.49E-03 7/23/2007 0.0223 1.32E-03 9.35E-04 9.96E-04 3.19E-04 7/24/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/25/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/26/2007 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 7/27/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/28/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/30/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/31/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/1/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/2/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/3/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/4/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/5/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/7/2007 0.0451 2.66E-03 0.00E+00 0.00E+00 2.66E-03 8/8/2007 0.0343 2.02E-03 0.00E+00 0.00E+00 2.02E-03 8/9/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/10/2007 0.0111 6.58E-04 0.00E+00 0.00E+00 6.58E-04 8/11/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/12/2007 0.0463 2.73E-03 0.00E+00 0.00E+00 2.73E-03 8/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/14/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/16/2007 0.0351 2.07E-03 0.00E+00 0.00E+00 2.07E-03 8/17/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/18/2007 0.0125 7.39E-04 0.00E+00 0.00E+00 7.39E-04 8/19/2007 0.4211 2.49E-02 3.15E-03 1.39E-02 1.09E-02 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 17 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 8/20/2007 0.0583 3.44E-03 9.23E-06 0.00E+00 3.44E-03 8/21/2007 0.0661 3.90E-03 0.00E+00 0.00E+00 3.90E-03 8/22/2007 0.0024 1.43E-04 0.00E+00 1.06E-05 1.32E-04 8/23/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/24/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/25/2007 0.0111 6.58E-04 0.00E+00 0.00E+00 6.58E-04 8/26/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/27/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/28/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/30/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/31/2007 0.0351 2.07E-03 0.00E+00 0.00E+00 2.07E-03 9/1/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/2/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/3/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/4/2007 0.5176 3.05E-02 1.60E-02 2.13E-02 9.24E-03 9/5/2007 0.0351 2.07E-03 1.84E-04 1.33E-04 1.94E-03 9/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/7/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/8/2007 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 9/9/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/10/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/11/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/12/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/14/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/16/2007 0.0223 1.32E-03 0.00E+00 0.00E+00 1.32E-03 9/17/2007 0.1174 6.93E-03 0.00E+00 0.00E+00 6.93E-03 9/18/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/19/2007 0.0223 1.32E-03 0.00E+00 0.00E+00 1.32E-03 9/20/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/21/2007 0.0814 4.80E-03 0.00E+00 0.00E+00 4.80E-03 9/22/2007 0.0014 8.45E-05 0.00E+00 0.00E+00 8.45E-05 9/23/2007 0.0337 1.99E-03 0.00E+00 0.00E+00 1.99E-03 9/24/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/25/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/26/2007 0.0111 6.58E-04 0.00E+00 0.00E+00 6.58E-04 9/27/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/28/2007 0.1645 9.71E-03 0.00E+00 1.61E-03 8.10E-03 9/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/30/2007 0.5181 3.06E-02 1.58E-02 1.99E-02 1.07E-02 10/1/2007 0.3051 1.80E-02 1.52E-02 1.53E-02 2.73E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 18 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 10/2/2007 0.0661 3.90E-03 1.85E-03 1.80E-03 2.10E-03 10/3/2007 0.2021 1.19E-02 1.04E-02 1.04E-02 1.49E-03 10/4/2007 0.1277 7.54E-03 4.85E-03 4.86E-03 2.68E-03 10/5/2007 0.0000 0.00E+00 5.40E-04 4.79E-04 0.00E+00 10/6/2007 0.2567 1.51E-02 8.53E-03 8.61E-03 6.53E-03 10/7/2007 0.4032 2.38E-02 2.34E-02 2.34E-02 3.97E-04 10/8/2007 0.0703 4.15E-03 3.42E-03 3.38E-03 7.66E-04 10/9/2007 0.0081 4.80E-04 2.28E-05 0.00E+00 4.80E-04 10/10/2007 0.1521 8.97E-03 3.51E-03 3.61E-03 5.36E-03 10/11/2007 0.0024 1.41E-04 9.30E-04 8.69E-04 0.00E+00 10/12/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/14/2007 0.0000 0.00E+00 0.00E+00 1.09E-05 0.00E+00 10/15/2007 0.1155 6.82E-03 0.00E+00 0.00E+00 6.82E-03 10/16/2007 0.0953 5.62E-03 3.18E-03 3.54E-03 2.08E-03 10/17/2007 0.4131 2.44E-02 2.18E-02 2.18E-02 2.54E-03 10/18/2007 0.5302 3.13E-02 2.71E-02 2.71E-02 4.20E-03 10/19/2007 0.3034 1.79E-02 1.19E-02 1.20E-02 5.92E-03 10/20/2007 0.5333 3.15E-02 3.23E-02 3.23E-02 0.00E+00 10/21/2007 0.1245 7.35E-03 4.63E-03 4.60E-03 2.75E-03 10/22/2007 0.0306 1.80E-03 3.44E-03 3.37E-03 0.00E+00 10/23/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/24/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/25/2007 0.0000 0.00E+00 0.00E+00 1.09E-05 0.00E+00 10/26/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/27/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/28/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/29/2007 0.0583 3.44E-03 0.00E+00 0.00E+00 3.44E-03 10/30/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 10/31/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/1/2007 0.0591 3.49E-03 0.00E+00 0.00E+00 3.49E-03 11/2/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/3/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/4/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/5/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/7/2007 0.0703 4.15E-03 0.00E+00 0.00E+00 4.15E-03 11/8/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/9/2007 0.1538 9.08E-03 2.42E-03 3.85E-03 5.22E-03 11/10/2007 0.3527 2.08E-02 1.97E-02 1.97E-02 1.12E-03 11/11/2007 0.0703 4.15E-03 2.82E-03 2.72E-03 1.43E-03 11/12/2007 1.3244 7.82E-02 7.40E-02 7.40E-02 4.18E-03 11/13/2007 0.0111 6.58E-04 8.87E-04 7.81E-04 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 19 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 11/14/2007 0.0905 5.34E-03 1.63E-03 1.65E-03 3.69E-03 11/15/2007 0.3243 1.91E-02 1.70E-02 1.70E-02 2.14E-03 11/16/2007 0.9315 5.50E-02 5.41E-02 5.41E-02 8.50E-04 11/17/2007 0.7062 4.17E-02 3.93E-02 3.93E-02 2.39E-03 11/18/2007 0.0000 0.00E+00 6.10E-04 5.22E-04 0.00E+00 11/19/2007 0.0000 0.00E+00 4.53E-08 0.00E+00 0.00E+00 11/20/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/21/2007 0.0000 0.00E+00 0.00E+00 1.11E-05 0.00E+00 11/22/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/23/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/24/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/25/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 11/26/2007 0.2299 1.36E-02 4.52E-03 4.98E-03 8.59E-03 11/27/2007 0.0169 9.97E-04 2.81E-03 2.72E-03 0.00E+00 11/28/2007 0.2414 1.42E-02 1.01E-02 1.01E-02 4.12E-03 11/29/2007 0.3075 1.81E-02 1.84E-02 1.84E-02 0.00E+00 11/30/2007 0.0000 0.00E+00 1.29E-04 2.98E-05 0.00E+00 12/1/2007 0.4695 2.77E-02 2.00E-02 2.01E-02 7.60E-03 12/2/2007 2.7215 1.61E-01 1.54E-01 1.54E-01 6.74E-03 12/3/2007 5.3473 3.16E-01 3.10E-01 3.10E-01 5.98E-03 12/4/2007 0.3463 2.04E-02 2.12E-02 2.12E-02 0.00E+00 12/5/2007 0.0000 0.00E+00 1.47E-04 4.47E-05 0.00E+00 12/6/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/7/2007 0.0000 0.00E+00 0.00E+00 1.12E-05 0.00E+00 12/8/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/9/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/10/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/11/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/12/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/13/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/14/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/15/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/16/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/17/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/18/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/19/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/20/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/21/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/22/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/23/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/24/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/25/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/26/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 20 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 12/27/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/28/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/29/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/30/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 12/31/2007 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/1/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/2/2008 0.3615 2.13E-02 1.20E-02 1.35E-02 7.84E-03 1/3/2008 0.3908 2.31E-02 2.12E-02 2.13E-02 1.81E-03 1/4/2008 0.3908 2.31E-02 1.65E-02 1.66E-02 6.48E-03 1/5/2008 0.9086 5.36E-02 5.54E-02 5.54E-02 0.00E+00 1/6/2008 0.1270 7.50E-03 6.10E-03 6.14E-03 1.36E-03 1/7/2008 0.0293 1.73E-03 3.24E-04 2.25E-04 1.50E-03 1/8/2008 0.6350 3.75E-02 3.39E-02 3.40E-02 3.49E-03 1/9/2008 0.3517 2.08E-02 1.44E-02 1.44E-02 6.33E-03 1/10/2008 1.2310 7.27E-02 7.20E-02 7.20E-02 6.23E-04 1/11/2008 0.1759 1.04E-02 1.19E-02 1.20E-02 0.00E+00 1/12/2008 0.3713 2.19E-02 1.99E-02 1.99E-02 2.03E-03 1/13/2008 0.0000 0.00E+00 1.01E-04 9.05E-06 0.00E+00 1/14/2008 0.3615 2.13E-02 1.77E-02 1.78E-02 3.56E-03 1/15/2008 0.0000 0.00E+00 2.22E-04 1.35E-04 0.00E+00 1/16/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/17/2008 0.0000 0.00E+00 0.00E+00 1.07E-05 0.00E+00 1/18/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/19/2008 0.1172 6.92E-03 1.75E-04 3.75E-04 6.54E-03 1/20/2008 0.0293 1.73E-03 4.75E-04 3.53E-04 1.38E-03 1/21/2008 0.0000 0.00E+00 2.63E-05 0.00E+00 0.00E+00 1/22/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/23/2008 0.0000 0.00E+00 0.00E+00 1.07E-05 0.00E+00 1/24/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/25/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1/26/2008 0.1661 9.80E-03 1.37E-03 1.71E-03 8.09E-03 1/27/2008 0.0293 1.73E-03 2.86E-03 2.79E-03 0.00E+00 1/28/2008 0.0586 3.46E-03 6.41E-05 9.11E-05 3.37E-03 1/29/2008 0.4983 2.94E-02 2.74E-02 2.74E-02 1.98E-03 1/30/2008 0.4787 2.83E-02 2.31E-02 2.32E-02 5.05E-03 1/31/2008 0.6643 3.92E-02 3.78E-02 3.78E-02 1.37E-03 2/1/2008 0.3126 1.85E-02 1.89E-02 1.89E-02 0.00E+00 2/2/2008 0.1270 7.50E-03 6.39E-03 6.43E-03 1.06E-03 2/3/2008 0.0098 5.77E-04 1.45E-04 5.52E-05 5.21E-04 2/4/2008 0.0293 1.73E-03 0.00E+00 0.00E+00 1.73E-03 2/5/2008 0.5373 3.17E-02 2.85E-02 2.86E-02 3.15E-03 2/6/2008 0.7914 4.67E-02 3.99E-02 3.99E-02 6.76E-03 2/7/2008 0.6155 3.63E-02 3.67E-02 3.67E-02 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 21 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 2/8/2008 0.8011 4.73E-02 4.45E-02 4.46E-02 2.69E-03 2/9/2008 0.0684 4.04E-03 4.37E-03 4.36E-03 0.00E+00 2/10/2008 0.1856 1.10E-02 8.71E-03 8.72E-03 2.23E-03 2/11/2008 0.0195 1.15E-03 4.95E-04 3.99E-04 7.54E-04 2/12/2008 0.0293 1.73E-03 3.21E-04 3.08E-04 1.42E-03 2/13/2008 0.0000 0.00E+00 5.12E-05 0.00E+00 0.00E+00 2/14/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/15/2008 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 2/16/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 2/17/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/18/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/19/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/20/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/21/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/22/2008 0.0293 1.73E-03 0.00E+00 0.00E+00 1.73E-03 2/23/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/24/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/25/2008 0.0293 1.73E-03 0.00E+00 0.00E+00 1.73E-03 2/26/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/27/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2/28/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 2/29/2008 0.2442 1.44E-02 6.00E-03 7.22E-03 7.19E-03 3/1/2008 0.2540 1.50E-02 1.40E-02 1.40E-02 1.01E-03 3/2/2008 0.0000 0.00E+00 1.02E-05 0.00E+00 0.00E+00 3/3/2008 0.2149 1.27E-02 6.31E-03 6.48E-03 6.21E-03 3/4/2008 0.0000 0.00E+00 9.66E-05 3.78E-05 0.00E+00 3/5/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/6/2008 0.0098 5.77E-04 0.00E+00 9.98E-06 5.67E-04 3/7/2008 0.0488 2.88E-03 0.00E+00 0.00E+00 2.88E-03 3/8/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 3/9/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/10/2008 0.2052 1.21E-02 2.79E-03 3.65E-03 8.46E-03 3/11/2008 0.2345 1.38E-02 1.20E-02 1.20E-02 1.82E-03 3/12/2008 0.0000 0.00E+00 5.19E-05 0.00E+00 0.00E+00 3/13/2008 0.7523 4.44E-02 3.46E-02 3.47E-02 9.67E-03 3/14/2008 0.2833 1.67E-02 1.60E-02 1.60E-02 6.87E-04 3/15/2008 0.0488 2.88E-03 2.08E-03 2.05E-03 8.28E-04 3/16/2008 0.0195 1.15E-03 6.64E-07 0.00E+00 1.15E-03 3/17/2008 0.1270 7.50E-03 2.18E-03 2.36E-03 5.13E-03 3/18/2008 0.0000 0.00E+00 7.86E-05 2.17E-05 0.00E+00 3/19/2008 0.0293 1.73E-03 0.00E+00 0.00E+00 1.73E-03 3/20/2008 0.2052 1.21E-02 4.11E-03 4.40E-03 7.71E-03 3/21/2008 0.1856 1.10E-02 9.22E-03 9.30E-03 1.66E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 22 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 3/22/2008 0.0000 0.00E+00 2.01E-04 1.51E-04 0.00E+00 3/23/2008 0.8597 5.07E-02 4.33E-02 4.34E-02 7.32E-03 3/24/2008 0.0000 0.00E+00 4.36E-04 3.95E-04 0.00E+00 3/25/2008 0.3224 1.90E-02 6.88E-03 7.11E-03 1.19E-02 3/26/2008 0.3713 2.19E-02 2.48E-02 2.48E-02 0.00E+00 3/27/2008 0.0488 2.88E-03 1.36E-03 1.33E-03 1.56E-03 3/28/2008 0.2931 1.73E-02 1.18E-02 1.19E-02 5.38E-03 3/29/2008 0.0098 5.77E-04 1.39E-03 1.35E-03 0.00E+00 3/30/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3/31/2008 0.0488 2.88E-03 0.00E+00 0.00E+00 2.88E-03 4/1/2008 0.0000 0.00E+00 0.00E+00 9.55E-06 0.00E+00 4/2/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/3/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/4/2008 0.1172 6.92E-03 0.00E+00 0.00E+00 6.92E-03 4/5/2008 0.0879 5.19E-03 0.00E+00 0.00E+00 5.19E-03 4/6/2008 0.1563 9.23E-03 4.33E-03 5.76E-03 3.46E-03 4/7/2008 0.1270 7.50E-03 4.15E-03 4.18E-03 3.31E-03 4/8/2008 0.0977 5.77E-03 7.38E-04 7.80E-04 4.99E-03 4/9/2008 0.0098 5.77E-04 3.69E-05 0.00E+00 5.77E-04 4/10/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/11/2008 0.0000 0.00E+00 0.00E+00 9.56E-06 0.00E+00 4/12/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/13/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 4/14/2008 0.0293 1.73E-03 0.00E+00 0.00E+00 1.73E-03 4/15/2008 0.0195 1.15E-03 0.00E+00 0.00E+00 1.15E-03 4/16/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/17/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/18/2008 0.0391 2.31E-03 0.00E+00 0.00E+00 2.31E-03 4/19/2008 0.1954 1.15E-02 1.19E-03 3.34E-03 8.19E-03 4/20/2008 0.0195 1.15E-03 1.15E-04 8.49E-05 1.07E-03 4/21/2008 0.0977 5.77E-03 0.00E+00 0.00E+00 5.77E-03 4/22/2008 0.0586 3.46E-03 0.00E+00 9.56E-06 3.45E-03 4/23/2008 0.1368 8.07E-03 4.58E-03 5.06E-03 3.01E-03 4/24/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/25/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4/26/2008 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 4/27/2008 0.1465 8.65E-03 6.97E-04 1.48E-03 7.17E-03 4/28/2008 0.1661 9.80E-03 7.85E-03 7.89E-03 1.91E-03 4/29/2008 0.0782 4.61E-03 3.56E-04 3.51E-04 4.26E-03 4/30/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/1/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/2/2008 0.0000 0.00E+00 0.00E+00 9.06E-06 0.00E+00 5/3/2008 0.0879 5.19E-03 0.00E+00 0.00E+00 5.19E-03 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 23 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 5/4/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/5/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/6/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/7/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/8/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/9/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/10/2008 0.0195 1.15E-03 0.00E+00 0.00E+00 1.15E-03 5/11/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/12/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/13/2008 0.1075 6.34E-03 0.00E+00 0.00E+00 6.34E-03 5/14/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/15/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/16/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/17/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/18/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/19/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/20/2008 0.2149 1.27E-02 0.00E+00 4.74E-03 7.94E-03 5/21/2008 0.0782 4.61E-03 0.00E+00 0.00E+00 4.61E-03 5/22/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/23/2008 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 5/24/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/25/2008 0.0391 2.31E-03 0.00E+00 0.00E+00 2.31E-03 5/26/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/27/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/28/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/29/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/30/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5/31/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/1/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/2/2008 0.1172 6.92E-03 0.00E+00 0.00E+00 6.92E-03 6/3/2008 0.5276 3.11E-02 1.96E-02 2.57E-02 5.47E-03 6/4/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/5/2008 0.0586 3.46E-03 0.00E+00 0.00E+00 3.46E-03 6/6/2008 0.0098 5.77E-04 0.00E+00 8.71E-06 5.68E-04 6/7/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 6/8/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/9/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 6/10/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/11/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/12/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 6/13/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/14/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 6/15/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 24 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 6/16/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 6/17/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/18/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 6/19/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/20/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/21/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/22/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/23/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/24/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/25/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/26/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/27/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/28/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/29/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6/30/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/1/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/2/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/3/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/4/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/5/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/6/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/7/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/8/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/9/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/10/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/11/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/12/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/13/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/14/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/15/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/16/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/17/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/18/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/19/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/20/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/21/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/22/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/23/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/24/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/25/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/26/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 7/27/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7/28/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 25 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 7/29/2008 0.0684 4.04E-03 0.00E+00 0.00E+00 4.04E-03 7/30/2008 0.0098 5.77E-04 0.00E+00 0.00E+00 5.77E-04 7/31/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/1/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/2/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/3/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/4/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/5/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/6/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/7/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/8/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/9/2008 0.1077 6.36E-03 0.00E+00 0.00E+00 6.36E-03 8/10/2008 0.0083 4.89E-04 0.00E+00 0.00E+00 4.89E-04 8/11/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/12/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/13/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/14/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/15/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/16/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/17/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/18/2008 0.0497 2.93E-03 0.00E+00 0.00E+00 2.93E-03 8/19/2008 0.3231 1.91E-02 0.00E+00 8.69E-03 1.04E-02 8/20/2008 0.4557 2.69E-02 2.15E-03 2.27E-02 4.15E-03 8/21/2008 0.0249 1.47E-03 7.50E-05 7.17E-05 1.40E-03 8/22/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/23/2008 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 8/24/2008 0.3562 2.10E-02 1.14E-02 1.26E-02 8.39E-03 8/25/2008 0.0083 4.89E-04 1.50E-04 1.60E-04 3.29E-04 8/26/2008 0.0580 3.42E-03 0.00E+00 0.00E+00 3.42E-03 8/27/2008 0.1740 1.03E-02 3.33E-03 4.02E-03 6.25E-03 8/28/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/29/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8/30/2008 0.1243 7.33E-03 0.00E+00 5.89E-04 6.75E-03 8/31/2008 0.0000 0.00E+00 0.00E+00 5.47E-05 0.00E+00 9/1/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/2/2008 0.0000 0.00E+00 0.00E+00 1.06E-05 0.00E+00 9/3/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/4/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/5/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/6/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/7/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/8/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/9/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ATTACHMENT 3 Model Mass Balance Calculations Groundwater Mounding Analysis Yelm Community Schools Yelm, Washington Page 26 of 26 2/19/2020 \\tacoma3\PROJECT\1174\040.010\R\Atts\Att3_Model Mass Balance Landau Associates Date Precipitation (inches) Precipitation (AF) (a) Flow to Facility (AF) (b) Facility Recharge (AF) (b) Evaporation (AF) (c) 9/10/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/11/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/12/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/13/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/14/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/15/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/16/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/17/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/18/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/19/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/20/2008 0.0497 2.93E-03 0.00E+00 0.00E+00 2.93E-03 9/21/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/22/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/23/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/24/2008 0.0746 4.40E-03 0.00E+00 0.00E+00 4.40E-03 9/25/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/26/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/27/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/28/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/29/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9/30/2008 0.0000 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Notes (b) Flow to Facility and Facility Recharge were taken directly from WWHM output data. Abbreviations and Acronyms AF = acre-feet (a) precipitation volume was calculated by multiplying the precipitation by the total area (impermeable area and infiltration facility). (c) Evaporation is calculated from precipitation volume minus facility recharge. Evaporation may occur both in the contributing impermeable area and the facility. APPENDIX 5 CONSTRUCTION SWPPP Construction SWPPP 202 Stevens Avenue NW Bus Parking Expansion Yelm, WA June 2019 2 of 10 TABLE OF CONTENTS Construction Stormwater Pollution Prevention Plan Cover Sheet …………………………………………………………………………………………………………………………………………..1 Table of Contents ……………………………………………………………………………………………………………………………………2 Construction Stormwater Pollution Prevention Elements ……………………………………………………………………..3 Objective of the Stormwater Pollution Prevention Plan …………………………………………………………………..3 Summary of the Elements ……………………………………………………………………………………………………………….3 Element #1 – Mark Clearing Limits ………………………………………………………………………………………………3-4 Element #2 – Establish Construction Access …………………………………………………………………………………….4 Element #3 – Control Flow Rates …………………………………………………………………………………………………….4 Element #4 – Install Sediment Controls …………………………………………………………………………………………..4 Element #5 – Stabilize Soils …………………………………………………………………………………………………………….5 Element #6 – Protect Slopes ……………………………………………………………………………………………………………5 Element #7 – Protect Drain Inlets …………………………………………………………………………………………………….5 Element #8 – Stabilize Channels and Outlets ……..……………………………………………………………………………6 Element #9 – Control Pollutants ………………………………………………………………………………………………………6 Element #10 – Control Dewatering ………………………………………………………………………………………………….6 Element #11 – Maintain BMPs ………..………………………………………………………………………………………………7 Element #12 – Manage the Project …….………………………………………………………………………………………….7-8 Element #13 – Protection of Low Impact Development BMPs …………………………………………………………8 Project Description ……………………………………………………………………………………………………………………………….9 Location ………………………………………………………………………………………………………………………………………….9 Project Overview …………………………………………………………………………………………………………………………….9 Existing Site Conditions ………………………………………………………………………………………………………………………...9 Existing Drainage System ………………………………………………………………………………………………………………..9 Existing Topography and Vegetation ………………………………………………………………………………………………9 Adjacent Areas ………………………………………………………………………………………………………………………………………9 Critical Areas …………………………………………………………………………………………………………………………………………9 Soils ………………………………………………………………………………………………………………………………………………………9 Erosion Problem Areas …….………….….……………………………………………………………………………………………………10 Construction Phasing …………..………………………………………………………………………………………………………………10 Construction Schedule …………………..……………………………………………………………………………………………………10 Engineering Calculations ………………….………………………………………………………………………………………………….10 Site Plan ………………………………………………………………………………………………………………………………………………10 References ………………………………………………………………………………………………………………………………………….10 3 of 10 CONSTRUCTION STORMWATER POLLUTION PREVENTION ELEMENTS Objective of Stormwater Pollution Prevention Plan The purpose of a Construction Stormwater Pollution Prevention Plan (SWPPP) is to describe the potential for pollution problems during the duration of a construction project. The SWPPP also explains and illustrates the measures that may need to be taken on the construction site to control said problems. The SWPPP is a guideline for the Contractor to follow during the construction process to prevent erosion and migration of sediments. Erosion control measures are not limited to those that are identified in this SWPPP or on the temporary erosion and sediment control plans. Construction Best Management Practices (BMPs) shall be installed as necessary to meet the Department of Ecology’s guidelines for construction stormwater pollution prevention and the requirements that are set forth in the National Pollutant Discharge Elimination System (NPDES) Permit. This SWPPP was prepared in accordance to the established guidelines and BMPs that are set forth in Volume 2 of the 2014 Department of Ecology Stormwater Management Manual for Western Washington (SWMMWW). The SWMMWW describes the thirteen (13) elements of construction stormwater pollution prevention. The thirteen (13) elements include the following: Element 1 – Mark Clearing Limits Element 2 – Establish Construction Access Element 3 – Control Flow Rates Element 4 – Install Sediment Controls Element 5 – Stabilize Soils Element 6 – Protect Slopes Element 7 – Protect Drain Inlets Element 8 – Stabilize Channels and Outlets Element 9 – Control Pollutants Element 10 – Control Dewatering Element 11 – Maintain BMPs Element 12 – Manage the Project Element 13 – Protection of Low Impact Development BMPs Summary of Elements The BMPs listed in this report, or their equivalent, are required. Any revisions by the Contractor to the BMPs listed in the SWPPP shall be approved by the Engineer in writing. Thus, if the Contractor does not require a BMP or needs to modify a BMP, the Contractor shall document the reason(s) and present the documentation to the Engineer for approval. Element 1 - Mark Clearing Limits Prior to beginning land disturbing activities, which include site clearing and grading, the Contractor shall mark the clearing limits (including trees) that are to be preserved within the construction zone. High- visibility fences shall be installed/erected as shown on the temporary erosion and sediment control plan and in accordance with the landscaping plan. The following BMPs are applicable for this project. If the 4 of 10 following BMPs are not shown on the construction plan set, the Engineer reserves the right to direct the Contractor to install, construct, and/or implement said BMPs. BMP C101: Preserving Natural Vegetation BMP C103: High-Visibility Plastic or Metal Fence with Backup Support BMP C104: Stake and Wire Fence Element 2 - Establish Construction Access A stabilized construction entrance shall be constructed to minimize the tracking of sediment onto any public road. The stabilized construction entrance shall be constructed per the TESC plans and details and in accordance with the requirements of BMP C105. BMP C105: Stabilized Construction Entrance Element 3 - Control Flow Rates Properties and waterways downstream from the development site shall be protected from erosion due to increases in the volume, velocity, and/or peak flow rates of stormwater runoff from the project site. The following BMPs are applicable for this project. If the following BMPs are not shown on the construction plan set, the Engineer reserves the right to direct the Contractor to install, construct, and/or implement said BMPs. BMP C240: Sediment Trap BMP C241: Temporary Sediment Pond Element 4 - Install Sediment Controls Prior to leaving a construction site or prior to discharging into an infiltration facility, stormwater runoff must pass through a sediment pond or some other appropriate BMP for removal of sediments. Silt fencing and straw bale barriers shall be constructed as shown on the temporary and erosion sediment control plans. The following BMPs are applicable for this project. If the following BMPs are not shown on the construction plan set, the Engineer reserves the right to direct the Contractor to install, construct, and/or implement said BMPs. BMP C230: Straw Bale Barrier BMP C231: Brush Barrier BMP C232: Gravel Filter Berm BMP C233: Silt Fence BMP C234: Vegetated Filter Strip BMP C235: Straw Wattles BMP C240: Sediment Trap BMP C241: Temporary Sediment Pond BMP C251: Construction Stormwater Filtration 5 of 10 Element 5 - Stabilize Soils All exposed and unworked soils shall be stabilized by application of effective BMPs, which protect the soil from the erosive forces of raindrop impact, flowing water, and from wind erosion. From October 01 through April 30 of each calendar year, no soils shall remain exposed and unworked form more than two (2) days. From May 01 to September 30 of each calendar year, no soils shall remain exposed and unworked for more than seven (7) days. This condition applies to all on-site soils, whether at final grade or not. In areas where the on-site soils will remain unworked for more than the aforementioned time duration limits or have reached final grade, seeding and mulching shall be installed in accordance with BMP C120 and C121. Sod shall be installed in accordance with BMP C124 for disturbed areas that require immediate vegetative cover. Dust control shall be used as needed to prevent wind transport of dust from disturbed soil surfaces and in accordance with BMP C140. If the following BMPs are not shown on the construction plan set, the Engineer reserves the right to direct the Contractor to install, construct, and/or implement said BMPs. BMP C120: Temporary and Permanent Seeding BMP C121: Mulching BMP C123: Plastic Covering BMP C124: Sodding BMP C125: Topsoiling BMP C140: Dust Control Element 6 - Protecting Slopes Slopes shall be constructed in such a manner that will minimize erosion. This shall include, but is not limited to: placing excavated material on the uphill side of trenches, collecting drainage at the top of slopes, etc. If the following BMPs are not shown on the construction plan set, the Engineer reserves the right to direct the Contractor to install, construct, and/or implement said BMPs. BMP C200: Interceptor Dike and Swale BMP C205: Subsurface Drains BMP C206: Level Spreader BMP C207: Check Dams Element 7 - Protect Drain Inlets All storm drain catch basins/inlets that are in use during construction, as well as all existing structures within the project limits, shall be protected so that stormwater runoff shall not enter any conveyance system without first being filtered or treated to remove sediment from sediment laden runoff. Install storm drain inlet protection devices as shown on the erosion and sediment control plans and in accordance with BMP C220. BMP C220: Storm Drain Inlet Protection 6 of 10 Element 8 - Stabilize Channels and Outlets All temporary on-site conveyance channels shall be constructed and stabilized to prevent erosion. Stabilization that is adequate to prevent erosion of outlets and drainage channels shall be provided. If the following BMPs are not shown on the construction plan set, the Engineer reserves the right to direct the Contractor to install, construct, and/or implement said BMPs. BMP C202: Channel Lining BMP C209: Outlet Protection Element 9 - Control Pollutants All pollutants, including waste materials and demolition of debris, that are generated or brought on-site during construction activities shall be handled and disposed of in a manner that does not cause contamination of stormwater. Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic system drawdown, solvent and degreasing cleaning operations, fuel tank drawdown and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill prevention measures. Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Emergency repairs may be performed on-site using temporary plastic placed beneath and, if raining, over the vehicle. Application of agricultural chemicals, including fertilizers and pesticides, shall be conducted in a manner and at application rates that will not result in loss of chemical(s) to stormwater runoff. Manufacturers’ recommendations shall be followed for application rates and procedures. The following Source Control BMPs will be prepared/implemented by the Contractor for this project. A Spill Prevention Plan Maintenance of storm drainage facilities Street sweeping at an interval that’s prescribed by the Engineer and/or the City of Centralia Element 10 - Control Dewatering All foundation, vault, and trench dewatering activities shall be routed to a sediment pond for basic filtering/treatment. Clean, non-turbid dewatered water, as determined by the Certified Professional in Erosion and Sediment Control, can be discharged to systems tributary to state surface waters, provided the dewatering flow does not cause erosion or flooding to receiving waters. Highly turbid or otherwise contaminated dewatered water that’s from construction equipment operation, clamshell digging, concrete tremie pour, or work inside a cofferdam, shall be handled separately from stormwater at the site. Some disposal options, depending on site constraints, may include: Transport off-site in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that does not pollute State waters On-site treatment using chemical treatment or other suitable treatment technologies Sanitary sewer discharge with local sewer district’s approval if there is no other option 7 of 10 Element 11 - Maintain BMPs All temporary and permanent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function. All maintenance and repairs shall be completed in accordance with the practices, procedures, and materials for each respective BMP. Sediment Control BMPs shall be inspected weekly or after a runoff-producing storm event during the dry season and daily during the wet season. All temporary erosion and Sediment Control BMPs shall be removed within thirty (30) days after final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment shall be removed or stabilized on-site. Disturbed soil areas resulting from removal of BMPs or vegetation shall be permanently stabilized. Element 12 - Manage the Project Phasing of Construction - the project shall be phased where feasible in order to prevent, to the maximum extent practicable, the transport of sediment from the site during construction. Revegetation of exposed areas and maintenance of said vegetation shall be an integral part of the clearing activities for each phase. Seasonal Work Limitations - from October 01 through April 30, clearing, grading, and other soil disturbing activities shall only be permitted if shown to the satisfaction of the local permitting authority that silt-laden runoff will be prevented from leaving the construction site. The following activities are exempt for the seasonal clearing and grading limitations: 1. Routine maintenance and necessary repair of erosion and sediment control BMPs. 2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or result in the removal of the vegetative cover to the soil. 3. Activities where there is 100% infiltration of surface runoff within the site in approved and installed erosion and sediment control facilities. Inspection and Monitoring - all BMPs shall be inspected, maintained, and repaired as needed to assure continued performance of their intended function. The Certified Professional in Erosion and Sediment Control for this project is ______________________________. ______________________________ shall be on-site or on-call at all times during construction. The role of the Certified Professional in Erosion and Sediment Control is to identify problems or failures of erosion control measures in the field and to promptly initiate corrective measures. The Certified Professional in Erosion and Sediment Control shall be compensated by the Contractor. Sampling and analysis of discharged stormwater from the construction site may be necessary to ensure compliance with the standards. 8 of 10 Whenever inspection and/or monitoring reveals that the BMPs identified in the Construction SWPPP are inadequate, due to the actual discharge of or potential to discharge a significant amount of any pollutant, the Construction SWPPP shall be modified, as appropriate, in a timely manner. Maintenance of the Construction SWPPP - the Construction SWPPP shall be retained on-site or within reasonable access to the site. The Construction SWPPP shall be modified whenever there is a significant change in the design, construction, operation, and/or maintenance of any BMP. Element 13 – Protect Low Impact Development BMPs Protect all biofiltration swale and detention pond BMPs from sedimentation through installation and maintenance of erosion and sediment control BMPs on portions of the site that drain into the biofiltration swale and/or detention pond. Restore BMPs to their fully functioning condition if they accumulate sediment during construction. Restoring the BMP must include removal of sediment and any sediment-laden swale and/or pond soils, and replacing the removed soils with soils meeting the design specification. Prevent compacting the biofiltration soil and detention pond BMPs by excluding construction equipment and foot traffic. Protect completed lawn and landscaped areas from compaction due to construction equipment. Keep all heavy equipment off existing soils under LID facilities that have been excavated to final grade to retain the infiltration rate of the soils. BMP C102: Buffer Zone BMP C103: High Visibility Fence BMP C200: Interceptor Dike and Swale BMP C201: Grass-Lined Channels BMP C207: Check Dams BMP C208: Triangular Silt Dike BMP C231: Brush Barrier BMP C233: Silt Fence BMP C234: Vegetated Strip 9 of 10 PROJECT DESCRIPTION Location The proposed site development project is located at 202 Stevens Avenue NW, SE Yelm, WA 98597 Project Overview The proposed site improvements / construction activities include the following: Site preparation, grading, and erosion control activities Expansion of an impervious surface parking lot Construction of on-site stormwater facilities EXISTING SITE CONDITIONS Existing Drainage System The existing parcel is occupied by the Yelm School District Transportation facility, which includes parking for school buses, and is approximately 8.78 acres in size. The western portion of the site is vegetated with grass, and a small drainage swale extends from the existing pavement which feeds into a below- grade infiltration gallery. Existing Topography & Vegetation The site slopes in a southwest-to-northeast direction. The site is occupied by the Yelm School District Bus Transportation facility. ADJACENT AREAS The project site is located adjacent to residential and commercial users. CRITICAL AREAS According to best available information, the proposed work will not take place in critical areas. Yelm Creek is located to the north of the project area. SOILS Refer to the project’s geotechnical memorandum for the on-site soil type(s). 10 of 10 EROSION PROBLEM AREAS Potential on-site erosion control problems are not anticipated for this project. Refer to the project’s geotechnical engineer report. CONSTRUCTION PHASING This project will be completed in one (1) phase. CONSTRUCTION SCHEDULE Anticipated construction activities and sequences are shown in the following table. CONSTRUCTION ACTIVITY ANTICIPATED DATE OF COMPLETION Contractor Notice to Proceed Summer 2020 Install Erosion Control Facilities Summer 2020 Begin Site Rough Grading Summer 2020 Begin Installing Site Utilities Summer 2020 Stabilize Site Summer 2020 Project Substantial Completion Summer 2020 Table 1: Anticipated Construction Schedule ENGINEERING CALCULATIONS Refer to this project’s Stormwater Site Plan for stormwater design calculations. SITE PLAN See the project’s storm and temporary erosion control plans REFERENCES Volume II of the 2014 Department of Ecology Stormwater Management Manual for Western Washington. APPENDIX 6 OPERATIONS & MAINTENANCE PLAN Operations & Maintenance Manual 202 Stevens Avenue NW Bus Parking Expansion Yelm, WA June 2019 TABLE OF CONTENTS Stormwater Facility Maintenance Program Cover Sheet …………………………………………..………………………………………………………………………………………………1 Table of Contents ………………….………………………………………………………………………………………………………………2 Estimate of Annual Maintenance Costs ……………….………………………………………………….……………………………3 Maintenance Plan Schedule …………………..………..……………………………………………………………………………………4 Location of Operations and Maintenance Manual ………………..……………..………………………………………………5 Written Description of Facilities …………………….………………………………………………………………………………………6 Required Recordkeeping and Reports ……………….……………………………………………………………………………………7 Maintenance Activity Log ………………………………………………………………………………………………………………………8 Maintenance Program …………………………………………………………………………………..……………………………………9 ESTIMATE OF ANNUAL MAINTENANCE COSTS ITEM #DESCRIPTION QTY.UNIT COST / UNIT ANNUAL COST Stormwater Piping1. pipe jetting 200 LF $0.25 $50.00 Catch Basins2. Repairs and Vac Truck Services 1 EA $50.00 $50.00 Infiltration Pond 3. Maintenance 1 LS $250.00 $250.00 Subtotal $350.00 Contingency @ 10%$35.00 Total $385.001 1 2020 Net Present Value MAINTENANCE PLAN SCHEDULE On-site drainage facilities, which include stormwater piping and catch basins, will require routine maintenance. The following pages contain maintenance needs for most of the components that are a part of this project’s drainage system, as well as for some components that the project may not have. The checklist should be completed for all system components in accordance with the following schedule: M. Monthly from October through April A. Annually, once in late summer (preferably September) S. Storm-based, after any major storm event (use 1-inch in 24-hours as a guideline) Using copies of these pages, check off the problems investigated each time an inspection was performed. Add comments on problems found and actions taken. Some items do not need to be looked at every time an inspection is done. Use the suggested frequency as a guideline for the inspection. The following governing jurisdictions may be called for technical assistance. CONTACT PHONE NUMBER City of Yelm Public Works (360) 458-8410 Department of Ecology Stormwater Division (360) 407-6438 LOCATION OF OPERATIONS AND MAINTENANCE MANUAL This manual will be kept on-site at 202 Stevens Avenue NW, Yelm, WA 98597. The manual shall be made available to City of Yelm personnel upon request. WRITTEN DESCRIPTION OF FACILITIES The construction of water quality and flow control facilities were required for this project. The on-site stormwater facilities were designed from the technical guidance that is provided in the 2012 Department of Ecology Stormwater Management Manual for Western Washington as amended in December 2014. The on-site stormwater facilities were designed to reduce pollutant loads and concentrations in stormwater runoff as well as to mitigate, to the maximum extent practicable, the impacts of increased stormwater runoff volumes and flow rates to receiving waters. The project was graded in such a manner so as to maintain, to the maximum extent practicable, the existing landform. The on-site water quality facilities were designed to treat the minimum water quality flow rate and treatment volume from pollution generating impervious surface runoff. This project’s stormwater facilities include stormwater conveyance piping and catch basins. REQUIRED RECORDKEEPING AND REPORTS If required, the Owner shall submit an annual report to the authority having jurisdiction by August 31st of each calendar year which will include, at a minimum, the following: Name, address, and telephone number of the person(s) responsible for plan implementation and the person(s) completing the report. Time period covered by the report. A chronological summary of activities conducted to implement the program(s) required by the Operations & Maintenance Plan. This information shall be logged in the logbook with any additional comments/narrative. For any activities that are completed by paid parties, include a copy of the invoice for services. An outline of planned activities for the next year. MAINTENANCE ACTIVITY LOG Maintenance ActivityMaintenance Activity LogYelm School District Bus Transportation Facility ExpansionDate MAINTENANCE PROGRAM Inspection Period __________________________________________ Number of Sheets Attached __________________________________________ Date Inspected __________________________________________ Name of Inspector __________________________________________ Inspector’s Signature __________________________________________