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Storm report_combined Civil Engineers ● Structural Engineers ● Landscape Architects ● Community Planners ● Land Surveyors Preliminary Stormwater Report PREPARED FOR: Purvis/Evans c/o Matt Weber Tacoma, WA 98403 PROJECT: The Summit at Thompson Creek Yelm, Washington 2210919.10 PREPARED BY: J. Matthew Weber, PE Principal DATE: August 2022 Preliminary Stormwater Report PREPARED FOR: Purvis/Evans c/o Matt Weber Tacoma, WA 98403 PROJECT: The Summit at Thompson Creek Yelm, Washington 2210919.10 PREPARED BY: J. Matthew Weber, PE Principal DATE: August 2022 I hereby state that this Preliminary Stormwater Report for The Summit at Thompson Creek has been prepared by me or under my supervision and meets the standard of care and expertise that is usual and customary in this community for professional engineers. I understand that City of Yelm does not and will not assume liability for the sufficiency, suitability, or performance of drainage facilities prepared by me. 08/03/2022 Preliminary Stormwater Report The Summit at Thompson Creek 2210919.10 Table of Contents Section Page 1.0 Project Overview ............................................................................................................................ 1 2.0 Summary of Minimum Requirements .......................................................................................... 1 2.1 MR 1 – Preparation of Stormwater Site Plans .................................................................... 1 2.2 MR 2 - Construction Stormwater Pollution Prevention ....................................................... 1 2.3 MR 3 – Source Control of Pollution ..................................................................................... 1 2.4 MR 4 – Preservation of Natural Drainage Systems and Outfalls ........................................ 1 2.5 MR 5 – Onsite Stormwater Control ..................................................................................... 2 2.6 MR 6 – Runoff Treatment ................................................................................................... 2 2.7 MR 7 – Flow Control ........................................................................................................... 2 2.8 MR 8 – Wetlands Protection ............................................................................................... 2 2.9 MR 9 – Basin/Watershed Planning ..................................................................................... 2 2.10 MR 10 – Operation and Maintenance ................................................................................. 3 3.0 Existing Conditions ....................................................................................................................... 3 4.0 Soils Reports .................................................................................................................................. 3 5.0 Wells ................................................................................................................................................ 4 6.0 Fuel Tanks ...................................................................................................................................... 4 7.0 Sub-Basin Description................................................................................................................... 4 8.0 Analysis of the 100-Year Flood ..................................................................................................... 4 9.0 Aesthetic Considerations for Facilities ....................................................................................... 4 10.0 Facility Sizing and Downstream Analysis ................................................................................... 5 10.1 Conveyance ........................................................................................................................ 7 10.2 Treatment ............................................................................................................................ 7 10.3 Flow Control ...................................................................................................................... 10 10.4 Roof Runoff ....................................................................................................................... 11 10.5 Downstream Drainage ...................................................................................................... 11 11.0 Covenants Dedications, Easements .......................................................................................... 12 12.0 Property Owners Association Articles of Incorporation .......................................................... 12 13.0 Conclusion .................................................................................................................................... 12 Preliminary Stormwater Report The Summit at Thompson Creek 2210919.10 Appendices Appendix A Exhibits A-1 ............. Vicinity Map A-2 ............. Existing Conditions Map A-3 ............. Developed Conditions Map A-4 ............. NRCS Soil Map A-5 ............. FEMA Flood Map A-6 ............. Downstream Drainage Map Appendix B Facility Sizing B-1 ............. Existing Basin Map B-2 ............. Developed Basin Map B-3 ............. WWHM Report (West Basin) B-4 ............. WWHM Report (East Basin) B-5 ............. WWHM Report (South Basin) Appendix C Geotechnical Engineering Report South Sound Geotechnical Consulting, Inc. dated June 16, 2022 Preliminary Stormwater Report The Summit at Thompson Creek 1 2210919.10 1.0 Project Overview This Preliminary Stormwater Report summarizes the storm drainage analysis and design for a 101-lot residential development located at 14444 Berry Valley Road SE, in Yelm, Washington. The land is currently partially developed with a single-family residence and additional associated structures. The southern portion of the project site was historically used for dairy farming. The project includes dividing the parcels into 101 residential lots for single-family homes and eight tracts. Construction will include new roadways and sidewalks, sewer, water services, and stormwater facilities to treat and discharge/dispose of the project's stormwater. The proposed roadway features and utilities will be extended from both Berry Valley Road SE and Jackson Street SE. Where feasible, the individual homes will also have onsite infiltration trenches and/or drywells to infiltrate roof runoff. The project involves three Thurston County tax parcel numbers (21724230100, 21723140000, and 21723140102). A proposed boundary line adjustment will be recorded to transfer land area from Parcels 21723140102 & 21724230100 to Parcel 21723140000 with the remaining portion of Parcels 21723104102 & 21724230100 being removed from the overall project resulting in a total project area of 28.86 acres located in Section 24, Township 17 North, Range 1 East, W.M. The increased stormwater runoff resulting from the addition of impervious area will be treated and retained/detained in accordance with the most recent Washington State Department of Ecology (DOE) Stormwater Management Manual for Western Washington (SMMWW). 2.0 Summary of Minimum Requirements This project is subject to the SMMWW and is a new development that will add more than 10,000 square feet of impervious surfaces; therefore, all Minimum Requirements (MR) apply to this project. 2.1 MR 1 – Preparation of Stormwater Site Plans This preliminary report and the concept project plans represent the Preliminary Stormwater Site Plan for this project and satisfy MR 1. 2.2 MR 2 - Construction Stormwater Pollution Prevention A Construction Stormwater Pollution Prevention Plan will be prepared, under separate cover, for the site development permit application. 2.3 MR 3 – Source Control of Pollution Pollution source control Best Management Practices for a residential type project will be implemented including BMP’s such as street sweeping and landscape management . A Construction SWPPP will provide details on the control of pollution during construction. 2.4 MR 4 – Preservation of Natural Drainage Systems and Outfalls The project includes three primary discharge locations. The eastern portion of the site drains towards Thompson Creek and is characterized by soils conducive the infiltration. The project proposes to infiltrate all stormwater runoff generated within the East Basin. Runoff generated on the western and southern portion of the site enters a wetland complex along the western boundary where the runoff continues northerly through a broad drainage channel. The location of Preliminary Stormwater Report The Summit at Thompson Creek 2 2210919.10 the two proposed wetpond/detention pond facilities have been designed to mimic and preserve the existing flow patterns from the project site. 2.5 MR 5 – Onsite Stormwater Control Where feasible, primarily in the eastern basin, individual roof runoff infiltration systems will be provided. Along the western perimeter of the site, roof runoff will be dispersed towards the wetland buffer areas to maintain flows along the length of the wetland. Post construction soil quality and depth bmp’s will be implemented to enhance retention of precipit ation across the site. 2.6 MR 6 – Runoff Treatment Over 5,000 square feet of pollution generating impervious surface (PGIS) will be added as part of these improvements; therefore, runoff treatment is required for this site. Stormwater runoff from pollution generating surfaces in the eastern basin will be conveyed to a combination bio-retention swale and infiltration pond for treatment and disposal through infiltration. The bio-retention portion of the facility is sized to treat at least 91 percent of the total runoff volume as calculated using the Western Washington Hydrology Model (WWHM 2012) meeting the SMMWW treatment requirement. Wetponds will be utilized for treatment in the West and South basins. The wetponds consist of the lower stages of the combined wetpond/detention pond system with the minimum volume provided being based on the 24-hour runoff volume predicted by the WWHM model. Refer to Section 10.0 for facility sizing. 2.7 MR 7 – Flow Control The project exceeds the thresholds for new development projects and must provide flow control. Proposed flow control is achieved in the East Basin with the use of an infiltration pond that will infiltrate 100 percent of developed stormwater runoff. Flow control is provided in the West and South basins through the use of the combination wetpond/detention ponds. The pond detention volumes and discharge control structures are designed to match the discharge durations of the predeveloped site assuming forested conditions from 50-percent of the 2-year peak flow to the full 50-year peak flow. Refer to Section 10.0 for facility sizing. 2.8 MR 8 – Wetlands Protection A wetland delineation and stream assessment was performed by Land Services Northwest which identified three wetlands and a Type F stream on or adjacent to the project site. The identified wetlands, stream, and associated buffers will be preserved by protected tracts within the development. Runoff from portions of the project site will be dispersed towards the wetland buffers areas to preserve the existing flow patterns. The runoff from the southern wetpond/detention pond will be discharged to the larger on-site wetland matching the existing runoff discharge location. 2.9 MR 9 – Basin/Watershed Planning To our knowledge, there are no existing basin plans. Preliminary Stormwater Report The Summit at Thompson Creek 3 2210919.10 2.10 MR 10 – Operation and Maintenance The stormwater system for the roadway improvements will be publicly owned and maintained. The City of Yelm shall be responsible for the operation and maintenance of the public stormwater facilities. Operation and maintenance for drainage facilities constructed for each lot shall be the responsibility of the individual owners. 3.0 Existing Conditions The development portion of the site contains moderate to steep slopes with a ridge line running south to north. Runoff from the eastern portion of the site flows easterly towards Thompson Creek while the portion to the west of the ridge flows to the wetlands located at the western site boundary. The northwestern portion of the site is densely forested with mature trees and underbrush. The eastern portion of the site consists of grass with sparse trees and includes physical improvements associated with the existing residence including gravel driveways and outbuildings. The southern portion of the project site is primarily grass -covered with a few sporadic trees and shrubs with greater vegetation density along the southern boundary. 4.0 Soils Reports The soils identified by the NRCS Web Soil Survey (A-5) vary across the project site. The soil on the lower eastern portion of the site associated with Thompson Creek are identified as Nisqually loamy fine sand, 3 to 15 percent slopes (74). The soils mid-slope within the East Basin are Spanaway gravelly sandy loam, 3 to 15 percent slopes (111). This portion of the project site is conducive the infiltration. Lots within the Spanaway soil area will be provided within individual roof drain infiltration systems. The largest soil area in the central higher elevation portion of the site is identified as McChord- Everett complex, 3 to 15 percent slopes. This soil is classified as hydrologic soil group Type A, however, soil test holes dug by South Sound Geotechnical Consulting determined that the surface soils were underlain by glacial till/drift located approximately 1 to 5 feet below ground surface. Therefore, for stormwater modelling purposes, this soil is assumed to function as Type C. The soils located on the western perimeter of the site associated with the wetland areas are identified as Steilacoom-Yelm complex, 0 to 2 percent slopes (100) and Mckenna gravelly silt loam, 0 to 5 percent slopes (65). Soil test holes dug across the proposed project site generally match the soil types identified by the NRCS soil survey. Infiltration testing was performed in the location of the proposed eastern bio-infiltration/infiltration facility with an observed infiltration rate of 62 in/hr. A corrected infiltration rate of 28 in/hr is recommended by the Geotechnical Engineer. However, considering the potential presence of shallow groundwater, a conservative design rate of 4 in/hr was utilized for preliminary stormwater calculations. Preliminary Stormwater Report The Summit at Thompson Creek 4 2210919.10 Please see Appendix C for the complete South Sound Geotechnical Consulting report. 5.0 Wells There are two private wells located on the associated project properties. One well is located on the portion of Parcel 21723140102 that will be removed by BLA from the project. This well will remain in service with all proposed development being set back a minimum of 100-feet. The second existing well is located on Parcel 2172314000 and will be abandoned prior to final plat. Each lot will be served by the City of Yelm STEP collection system. The holding tank will be maintained by the City and pumped on a regular basis. Domestic water will be provided by the City of Yelm water distribution system. 6.0 Fuel Tanks No fuel tanks were observed at the project site. 7.0 Sub-Basin Description Review of available GIS topographic information indicates that the developed portion of the project site will receive runoff from the adjacent area of Parcel 21723140102. This area is accounted for in the pre-developed and developed basin areas utilized in sizing the proposed stormwater management facilities. The runoff from the project’s eastern basin area will be infiltrated onsite. Discharge from the western detention facility flows northerly through a broad drainage channel. While discharge from the southern pond enters the wetland complex where it eventually exits the project site at the northern boundary near Pond #1 and continues to flow north matching existing conditions. To our knowledge there are no critical infrastructure immediately downstream from the project site and potential anticipated impacts to the downstream basin area are mitigated by the proposed stormwater management facilities. 8.0 Analysis of the 100-Year Flood Federal Emergency Management Agency (FEMA) mapping indicates a Zone A associated with Thompson Creek. Base flood elevations have not been established, but observation indicates that the flood elevation should not exceed elevation 326. The lowest proposed lot pad elevation is 335.25. Please see the exhibit in Appendix A-4. 9.0 Aesthetic Considerations for Facilities The proposed bio-retention/infiltration facility is located within a proposed stormwater tract. The facility is designed with a maximum storage depth of 1.5 feet and side slopes will not exceed 3:1. This facility will be un-obtrusive due to shallow nature and moderate side slopes. The two wetpond/detention ponds are located within natural low areas and will be provided with 3:1 slopes. Fencing and landscape screening may be implemented to minimize the visual impact of these facilities. Preliminary Stormwater Report The Summit at Thompson Creek 5 2210919.10 10.0 Facility Sizing and Downstream Analysis The project site is modelled as three separate basins for stormwater facility sizing (East, West, and South). Impervious surfaces associated with proposed roads, sidewalks, and driveway approaches were calculated based on the site plan layout. An additional 500 square feet of impervious surfaces per lot was assumed for driveways (2,500 sf for flag lots). Assumed roof area is based on each lot’s building envelope and varies from 1,500 sf to a maximum of 2,500 square with the average being 2,200 sf. In the Eastern basin, except for 5 lots, the roof runoff will be infiltrated on each lot; therefore, this area is removed from the basin area tributary to the proposed bio-retention/infiltration facility. Each basin also includes bypass areas where , due to topographic constraints, the runoff is not directed to the stormwater facility. The bypass areas consist of non-pollution generating surfaces and the area is included in the downstream drainage compliance calculations. The stormwater system was sized and analyzed using WWHM. The following tables summarize the existing and developed areas within each basin area. East Basin Existing Areas Area (sf) Area (ac) Total Basin Area 392,773 9.017 Forest (moderate onsite) 183,021 4.202 Forest (steep onsite) 37,164 0.853 Forest (moderate offsite) 81,172 1.863 Forest (steep offsite) 14,987 0.344 Lawn (moderate offsite) 76,429 1.755 Developed Areas (to Infiltration) Area (sf) Area (ac) Total Basin Area 346,095 7.945 Roof Area Infiltrated on lots 30,100 0.691 Total Area to Facility (Total – roof) 315,995 7.254 Pavement 28,483 0.654 Sidewalk & Approaches 10,619 0.244 Driveway 12,500 0.287 Roof 10,250 0.235 Lawn/Landscape* 81,555 1.872 Forest (moderate offsite) 81,172 1.863 Forest (steep offsite) 14,987 0.344 Lawn (moderate offsite) 76,429 1.755 Developed Areas (Bypass) Area (sf) Area (ac) Total Basin Area 42,471 0.975 Roof Area Infiltrated on lots 12,600 0.289 Total Area to Facility (Total – roof) 29,871 0.686 Roof 1,000 0.023 Lawn/Landscape* 28,871 0.663 Preliminary Stormwater Report The Summit at Thompson Creek 6 2210919.10 West Basin Existing Areas Area (sf) Area (ac) Total Basin Area 284,228 6.525 Forest (moderate onsite) 247,999 5.693 Forest (steep onsite) 36,229 0.832 Developed Areas (to Pond #1) Area (sf) Area (ac) Total Basin Area 346,256 7.949 Pavement 52,180 1.198 Sidewalk & Approaches 16,348 0.375 Driveway 25,000 0.574 Roof 82,250 1.888 Lawn/Landscape* 170,478 3.914 Developed Areas (Bypass) Area (sf) Area (ac) Total Basin Area 42,850 0.984 Roof** 7,500 0.172 Lawn/Landscape* 35,350 0.812 South Basin Existing Areas Area (sf) Area (ac) Total Basin Area 543,740 12.483 Forest (moderate onsite) 416,230 9.555 Forest (moderate offsite) 20,875 0.479 Lawn (moderate offsite) 106,635 2.448 Developed Areas (to Pond #2) Area (sf) Area (ac) Total Basin Area 372,595 8.554 Pavement 38,649 0.887 Sidewalk & Approaches 10,713 0.246 Driveway 16,500 0.379 Roof 63,500 1.458 Lawn/Landscape* 115,723 2.657 Forest (moderate offsite) 20,875 0.479 Lawn (moderate offsite) 106,635 2.448 Developed Areas (Bypass) Area (sf) Area (ac) Total Basin Area 69,759 1.601 Roof** 16,000 0.367 Lawn/Landscape* 53,759 1.234 *Proposed landscape areas are modeled as pasture due to implementation of post-construction soil quality and depth bmps. **bypass roof areas in the West and South basins are modelled as grass to reflect the proposed dispersion bmps. Preliminary Stormwater Report The Summit at Thompson Creek 7 2210919.10 10.1 Conveyance The proposed conveyance system consists of a series of new catch basins, pipe reaches, and outfalls to the proposed stormwater management facilities. The conveyance system will be designed to convey a minimum of the 25-year, 24-hour design runoff event. Backwater calculations will be performed to for the 25-year and 100-year event to ensure that hydraulic head through the conveyance system did not cause surcharging of the proposed catch basin s. 10.2 Treatment East Basin Runoff quality control for the East Basin is provided by a bio-retention swale with a minimum of 18 inches of treatment soil mix that extends along the side slopes 1 foot above the bottom of the cell. The bottom width is 10 feet with a length of 130 feet, side slopes are 3:1, and the maximum design water depth is 6 inches. Runoff is introduced to the swale from the conveyance pipe s provided with rock pad protection. The standard bio-retention soil mix will be utilized, which has a soil infiltration rate of 12 inches per hour. Based on the size of the tributary area, a Ksat Safety Factor of 4 is applied to the treatment soil infiltration, resulting in a design rate of 3 inches per hour. As discussed in Section 4.0, a design infiltration rate of 4 inches per hour was used for the underlying soil. The bio-retention facility receives runoff from a basin with greater than 5,000 square feet of PGIS and is therefore designed so that the bottom of the treatment soil mix is a minimum of 3 feet above the seasonal high groundwater elevation. The bioretention area is provided with a maximum 6 inches of ponding prior to primary overflow. Given a design infiltration rate of 3 inches per hour, the design drawdown time is 2 hours, which is less than the maximum allowed 24-hour drawdown. The WWHM model shows that the propose bio-retention swale will infiltrate 96.48 percent of the total runoff through the treatment soil mix exceeded the minimum required of 91%. Preliminary Stormwater Report The Summit at Thompson Creek 8 2210919.10 Runoff volumes that exceed the bio-retention capacity overflows to the adjacent un-lined infiltration portion of the facility. Preliminary Stormwater Report The Summit at Thompson Creek 9 2210919.10 West Basin Quality control for runoff from the West Basin is provided by a proposed wetpond. The wetpond volume will be provided in the lower stages of the combined wetpond/detention Pond #1. The pond will be divided into two cells with 3:1 side slopes. The wetpond storage volume matches the 24-hour water quality volume calculated by WWHM. Preliminary Stormwater Report The Summit at Thompson Creek 10 2210919.10 South Basin Quality control for runoff from the West Basin is provided by a proposed wetpond. The wetpo nd volume will be provided in the lower stages of the combined wetpond/detention Pond #2. The pond will be divided into two cells with 3:1 side slopes. The wetpond storage volume matches the 24-hour water quality volume calculated by WWHM. 10.3 Flow Control East Basin Stormwater runoff enters the infiltration portion of the stormwater facility as overflow along the entire length of the bio-retention swale. The infiltration pond provides a 40 ft by 90 ft un-lined infiltration surface with a design infiltration rate of 4 in/hr. WWHM results show that the infiltration pond can infiltrate 100 percent of the tributary runoff with a maximum storage depth of 1.0 feet. Preliminary Stormwater Report The Summit at Thompson Creek 11 2210919.10 West & South Basins Detention volume is provided above the wetpond stage to temporarily store and discharge runoff from the site at a controlled rate. A combination orifice and notched weir control structure regulates the discharge from the pond matching the pre-developed conditions flow durations. A summary of the duration analysis for Detention Ponds #1 and #2 are provided in the WWHM reports included in Appendix B. 10.4 Roof Runoff Roof runoff in managed by the proposed stormwater facilities, dispersal into buffer areas, or infiltrated on-site where soils allow. Where feasible, stormwater runoff from the roof area of the homes will be infiltrated in individual drywells. The drywells will be sized in accordance with SMMWW Volume 3, Chapter 3, Section 3.1.1 - BMP T5.10A Downspout Full Infiltration System. 10.5 Downstream Drainage Runoff within the East Basin is proposed to be fully infiltrated with a small area of bypass. The runoff from the project site is not anticipated to have adverse effects on Thompson Creek. Runoff discharged from Ponds #1 and #2 will exit the project site at the northeast corner. The discharge from Pond #1 will be through a proposed level-spreader device. The runoff will continue in a northerly direction through a broad-flat drainage channel through mostly un- developed land to an intersection point with 93 rd Avenue East over ¼ mile downstream from the Preliminary Stormwater Report The Summit at Thompson Creek 12 2210919.10 project site. The pond discharge durations will match pre-developed conditions, therefore, impact to the downstream flow path is not anticipated. 11.0 Covenants Dedications, Easements Public right of way will be created by this proposal. In addition to the right of way, utility easements will be provided on each side of the proposed road and ingress/egress easements will be granted to the property to the south and west. 12.0 Property Owners Association Articles of Incorporation Not applicable. 13.0 Conclusion The proposed project involves site improvements associated with a 101-lot development. The project includes clearing, grading, erosion control, utility improvements, and stormwater management facilities. The site, as proposed, will meet the requirements of the most recent Department of Ecology Stormwater Management Manual for Western Washington (SMMWW). This report and associated plans have been prepared within the guidelines established by the City of Yelm for stormwater management. This analysis is based on data and records either supplied to or obtained by A HBL. These documents are referenced within the text of the analysis. The analysis has been prepared using procedures and practices within the standard accepted practices of the industry. AHBL, Inc. Matt Weber, PE Principal MW August 2022 Preliminary Stormwater Report The Summit at Thompson Creek 2210919.10 Appendix A Exhibits A-1 .................... Vicinity Map A-2 .................... Existing Conditions Map A-3 .................... Developed Conditions Map A-4 .................... NRCS Soil Map A-5 .................... FEMA Flood Map A-6 .................... Downstream Drainage Map 2215 North 30th Street, Suite 300, Tacoma, WA 98403 253.383.2422 TEL 253.383.2572 FAX THE SUMMIT AT THOMPSON CREEK 2210919.10 VICINITY MAP A-1 N VICINITY MAP NOT TO SCALE SITE NGRAPHIC SCALE080160 FEET1" = 80 FEET40BERRY VALLEY ROAD SE2215 North 30th Street,Suite 300,Tacoma, WA 98403253.383.2422 TEL253.383.2572 FAXJOB NO.DATE:THE SUMMIT AT THOMPSON CREEKEXISTING CONDITIONS MAPA-22210919.10JULY 2022 57645663556254615360595890929594913278848281808342 43 65411014039383736 667975747372686970716711019114125136147158179181646454410099989796343547484951525026252423222120938586878889777632313029282733350348352 354 35 6 3 5 8 35 8 356354 352 350 34 8 3 4 6 3 4 4 3423403383363343323 3 0 328 326382 382 380378376374372 370 368 366364362360358356354352366364362360358352 354356358364366368330332332338352 342 342348360354354348366346336344358362344350350 340346346336336340346346334334338340356360362356354352 350360352 344 356350356350350358358354354358358352364384394384 3 7 0 3 8 0 3 8 4 380372 370 380 376 364370358352360368372 NGRAPHIC SCALE080160 FEET1" = 80 FEET40BERRY VALLEY ROAD SE2215 North 30th Street,Suite 300,Tacoma, WA 98403253.383.2422 TEL253.383.2572 FAXJOB NO.DATE:THE SUMMIT AT THOMPSON CREEKDEVELOPED CONDITIONS MAPA-32210919.10JULY 2022 National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250 Feet Ü SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOOD HAZARD AREAS Without Base Flood Elevation (BFE) Zone A, V, A99 With BFE or DepthZone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mileZone X Future Conditions 1% Annual Chance Flood HazardZone X Area with Reduced Flood Risk due to Levee. See Notes.Zone X Area with Flood Risk due to LeveeZone D NO SCREEN Area of Minimal Flood Hazard Zone X Area of Undetermined Flood HazardZone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE) Effective LOMRs Limit of Study Jurisdiction Boundary Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 7/29/2022 at 1:16 PM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Legend OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES MAP PANELS 8 B 20.2 The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. 1:6,000 122°38'14"W 46°57'4"N 122°37'37"W 46°56'39"N Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020 A-4 Soil Map—Thurston County Area, Washington Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5/19/2022 Page 1 of 3519910051992005199300519940051995005199600519910051992005199300519940051995005199600527400527500527600527700527800527900528000528100528200528300528400 527400 527500 527600 527700 527800 527900 528000 528100 528200 528300 528400 46° 56' 59'' N 122° 38' 27'' W46° 56' 59'' N122° 37' 35'' W46° 56' 40'' N 122° 38' 27'' W46° 56' 40'' N 122° 37' 35'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 10N WGS84 0 100 200 400 600 Feet 0 40 80 160 240 Meters Map Scale: 1:2,920 if printed on B landscape (17" x 11") sheet. Soil Map may not be valid at this scale. A-5 350348352 354 35 6 3 5 8 35 8 356354 352 350 348 3 4 6 3 4 4 342340338336334362360358356354352366364362360358354356358364366330332332338352 342 342348360354354348366346336344358362 340346346336336340346346334334338340356360362356354352 350360352 344 356350N0100200 FEET1" = 100 FEETGRAPHIC SCALE50093RD AVE SE2215 North 30th Street,Suite 300,Tacoma, WA 98403253.383.2422 TEL253.383.2572 FAXJOB NO.DATE:THE SUMMIT AT THOMPSON CREEKDOWNSTREAM DRAINAGE MAPA-62210919.10JULY 2022DOWNSTREAMFLOW PATH1630± FEET DOWNSTREAMFROM PROJECT SITETHOMPSONCREEK Preliminary Stormwater Report The Summit at Thompson Creek 2210919.10 Appendix B Facility Sizing B-1 .................... Existing Basin Map B-2 .................... Developed Basin Map B-3 .................... WWHM Report (West Basin) B-4 .................... WWHM Report (East Basin) B-5 .................... WWHM Report (South Basin) NGRAPHIC SCALE080160 FEET1" = 80 FEET40BERRY VALLEY ROAD SE2215 North 30th Street,Suite 300,Tacoma, WA 98403253.383.2422 TEL253.383.2572 FAXJOB NO.DATE:THE SUMMIT AT THOMPSON CREEKEXISTING BASIN MAPB-12210919.10JULY 2022EAST BASINWEST BASINSOUTH BASIN 350348352 354 35 6 3 5 8 35 8 356354 352 350 34 8 3 4 6 3 4 4 3423403383363343323 3 0 328 326382 382 380378376374372 370 368 366364362360358356354352366364362360358352 354356358364366368330332332338352 342 342348360354354348366346336344358362344350350 340346346336336340346346334334338340356360362356354352 350360352 344 356350356350350358358354354358358352364384394384 3 7 0 3 8 0 3 8 4 380372 370 380 376 364370358352360368372 NGRAPHIC SCALE080160 FEET1" = 80 FEET40BERRY VALLEY ROAD SEBIO-INFILTRATION/INFILTRATION POND2215 North 30th Street,Suite 300,Tacoma, WA 98403253.383.2422 TEL253.383.2572 FAXJOB NO.DATE:THE SUMMIT AT THOMPSON CREEKDEVELOPED BASIN MAPB-22210919.10JULY 2022WETPOND/DETENTIONPOND #1WETPOND/DETENTIONPOND #2WEST BASINBYPASSEAST BASINBYPASSSOUTH BASINBYPASSEAST BASINWEST BASINSOUTH BASIN WWHM2012 PROJECT REPORT B-3 2210919-West Basin 7/29/2022 9:08:30 AM Page 2 General Model Information Project Name:2210919-West Basin Site Name:Summit at Thompson Site Address:Berry Valley City:Yelm Report Date:7/29/2022 Gage:Eaton Creek Data Start:1955/10/01 Data End:2011/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2019/09/13 Version:4.2.17 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Low Flow Threshold for POC2:50 Percent of the 2 Year High Flow Threshold for POC2:50 Year 2210919-West Basin 7/29/2022 9:08:30 AM Page 3 Landuse Basin Data Predeveloped Land Use Existing West Basin Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 5.693 C, Forest, Steep 0.832 Pervious Total 6.525 Impervious Land Use acre Impervious Total 0 Basin Total 6.525 Element Flows To: Surface Interflow Groundwater 2210919-West Basin 7/29/2022 9:08:30 AM Page 4 Mitigated Land Use Dev West Basin Bypass:No GroundWater:No Pervious Land Use acre C, Pasture, Flat 3.914 Pervious Total 3.914 Impervious Land Use acre ROADS MOD 1.198 ROOF TOPS FLAT 1.888 DRIVEWAYS MOD 0.574 SIDEWALKS MOD 0.375 Impervious Total 4.035 Basin Total 7.949 Element Flows To: Surface Interflow Groundwater West Pond West Pond 2210919-West Basin 7/29/2022 9:08:30 AM Page 5 West Bypass Bypass:Yes GroundWater:No Pervious Land Use acre C, Pasture, Flat 0.812 C, Lawn, Mod 0.172 Pervious Total 0.984 Impervious Land Use acre Impervious Total 0 Basin Total 0.984 Element Flows To: Surface Interflow Groundwater 2210919-West Basin 7/29/2022 9:08:30 AM Page 6 Routing Elements Predeveloped Routing 2210919-West Basin 7/29/2022 9:08:30 AM Page 7 Mitigated Routing West Pond Bottom Length:180.00 ft. Bottom Width:72.00 ft. Depth:8 ft. Volume at riser head:3.0405 acre-feet. Side slope 1:3 To 1 Side slope 2:3 To 1 Side slope 3:3 To 1 Side slope 4:3 To 1 Discharge Structure Riser Height:7 ft. Riser Diameter:18 in. Notch Type:Rectangular Notch Width:0.250 ft. Notch Height:0.750 ft. Orifice 1 Diameter:1.4375 in.Elevation:0 ft. Element Flows To: Outlet 1 Outlet 2 Pond Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.297 0.000 0.000 0.000 0.0889 0.300 0.026 0.016 0.000 0.1778 0.303 0.053 0.023 0.000 0.2667 0.306 0.080 0.029 0.000 0.3556 0.310 0.108 0.033 0.000 0.4444 0.313 0.135 0.037 0.000 0.5333 0.316 0.163 0.041 0.000 0.6222 0.319 0.191 0.044 0.000 0.7111 0.322 0.220 0.047 0.000 0.8000 0.325 0.249 0.050 0.000 0.8889 0.329 0.278 0.052 0.000 0.9778 0.332 0.307 0.055 0.000 1.0667 0.335 0.337 0.057 0.000 1.1556 0.338 0.367 0.060 0.000 1.2444 0.342 0.397 0.062 0.000 1.3333 0.345 0.428 0.064 0.000 1.4222 0.348 0.459 0.066 0.000 1.5111 0.351 0.490 0.068 0.000 1.6000 0.355 0.521 0.070 0.000 1.6889 0.358 0.553 0.072 0.000 1.7778 0.361 0.585 0.074 0.000 1.8667 0.365 0.617 0.076 0.000 1.9556 0.368 0.650 0.078 0.000 2.0444 0.371 0.683 0.080 0.000 2.1333 0.375 0.716 0.081 0.000 2.2222 0.378 0.749 0.083 0.000 2.3111 0.382 0.783 0.085 0.000 2.4000 0.385 0.817 0.086 0.000 2.4889 0.389 0.852 0.088 0.000 2.5778 0.392 0.887 0.090 0.000 2.6667 0.396 0.922 0.091 0.000 2.7556 0.399 0.957 0.093 0.000 2210919-West Basin 7/29/2022 9:08:30 AM Page 8 2.8444 0.402 0.993 0.094 0.000 2.9333 0.406 1.029 0.096 0.000 3.0222 0.410 1.065 0.097 0.000 3.1111 0.413 1.101 0.098 0.000 3.2000 0.417 1.138 0.100 0.000 3.2889 0.420 1.176 0.101 0.000 3.3778 0.424 1.213 0.103 0.000 3.4667 0.427 1.251 0.104 0.000 3.5556 0.431 1.289 0.105 0.000 3.6444 0.435 1.328 0.107 0.000 3.7333 0.438 1.367 0.108 0.000 3.8222 0.442 1.406 0.109 0.000 3.9111 0.445 1.445 0.110 0.000 4.0000 0.449 1.485 0.112 0.000 4.0889 0.453 1.525 0.113 0.000 4.1778 0.457 1.566 0.114 0.000 4.2667 0.460 1.606 0.115 0.000 4.3556 0.464 1.647 0.117 0.000 4.4444 0.468 1.689 0.118 0.000 4.5333 0.471 1.731 0.119 0.000 4.6222 0.475 1.773 0.120 0.000 4.7111 0.479 1.815 0.121 0.000 4.8000 0.483 1.858 0.122 0.000 4.8889 0.487 1.901 0.124 0.000 4.9778 0.490 1.945 0.125 0.000 5.0667 0.494 1.988 0.126 0.000 5.1556 0.498 2.032 0.127 0.000 5.2444 0.502 2.077 0.128 0.000 5.3333 0.506 2.122 0.129 0.000 5.4222 0.510 2.167 0.130 0.000 5.5111 0.513 2.212 0.131 0.000 5.6000 0.517 2.258 0.132 0.000 5.6889 0.521 2.305 0.133 0.000 5.7778 0.525 2.351 0.134 0.000 5.8667 0.529 2.398 0.135 0.000 5.9556 0.533 2.445 0.136 0.000 6.0444 0.537 2.493 0.137 0.000 6.1333 0.541 2.541 0.138 0.000 6.2222 0.545 2.589 0.139 0.000 6.3111 0.549 2.638 0.153 0.000 6.4000 0.553 2.687 0.188 0.000 6.4889 0.557 2.736 0.235 0.000 6.5778 0.561 2.786 0.289 0.000 6.6667 0.565 2.836 0.350 0.000 6.7556 0.569 2.886 0.414 0.000 6.8444 0.573 2.937 0.482 0.000 6.9333 0.577 2.988 0.553 0.000 7.0222 0.582 3.040 0.661 0.000 7.1111 0.586 3.092 1.197 0.000 7.2000 0.590 3.144 2.014 0.000 7.2889 0.594 3.197 2.985 0.000 7.3778 0.598 3.250 3.998 0.000 7.4667 0.602 3.303 4.938 0.000 7.5556 0.607 3.357 5.711 0.000 7.6444 0.611 3.411 6.264 0.000 7.7333 0.615 3.466 6.629 0.000 7.8222 0.619 3.521 7.042 0.000 7.9111 0.623 3.576 7.381 0.000 2210919-West Basin 7/29/2022 9:08:30 AM Page 9 8.0000 0.628 3.632 7.704 0.000 8.0889 0.632 3.688 8.014 0.000 2210919-West Basin 7/29/2022 9:08:30 AM Page 10 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:6.525 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:4.898 Total Impervious Area:4.035 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.299159 5 year 0.501527 10 year 0.675925 25 year 0.949976 50 year 1.198315 100 year 1.489188 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.1883 5 year 0.276834 10 year 0.347305 25 year 0.451199 50 year 0.540294 100 year 0.640217 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1956 0.338 0.195 1957 0.613 0.258 1958 0.276 0.133 1959 0.278 0.177 1960 0.384 0.422 1961 0.297 0.169 1962 0.111 0.114 1963 0.738 0.343 1964 0.293 0.176 1965 0.314 0.167 2210919-West Basin 7/29/2022 9:08:51 AM Page 11 1966 0.170 0.134 1967 0.403 0.173 1968 0.244 0.133 1969 0.152 0.127 1970 0.262 0.176 1971 0.336 0.189 1972 0.780 0.655 1973 0.283 0.250 1974 0.224 0.164 1975 0.207 0.136 1976 0.387 0.213 1977 0.088 0.091 1978 0.325 0.309 1979 0.263 0.130 1980 0.284 0.167 1981 0.914 0.345 1982 0.240 0.216 1983 0.468 0.208 1984 0.386 0.149 1985 0.126 0.125 1986 0.500 0.205 1987 0.449 0.294 1988 0.206 0.147 1989 0.517 0.247 1990 0.411 0.196 1991 2.876 0.510 1992 0.575 0.213 1993 0.190 0.198 1994 0.155 0.111 1995 0.414 0.199 1996 0.650 0.590 1997 0.295 0.350 1998 0.520 0.246 1999 0.392 0.411 2000 0.250 0.153 2001 0.254 0.167 2002 0.145 0.114 2003 0.248 0.172 2004 0.414 0.209 2005 0.221 0.129 2006 0.304 0.161 2007 0.302 0.282 2008 0.260 0.160 2009 0.513 0.216 2010 0.129 0.124 2011 0.203 0.139 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 2.8759 0.6549 2 0.9137 0.5900 3 0.7800 0.5096 4 0.7379 0.4217 5 0.6499 0.4113 6 0.6132 0.3502 7 0.5747 0.3454 8 0.5200 0.3428 2210919-West Basin 7/29/2022 9:08:51 AM Page 12 9 0.5169 0.3088 10 0.5131 0.2937 11 0.4998 0.2818 12 0.4681 0.2585 13 0.4487 0.2500 14 0.4141 0.2465 15 0.4137 0.2461 16 0.4110 0.2162 17 0.4027 0.2156 18 0.3922 0.2134 19 0.3873 0.2126 20 0.3860 0.2086 21 0.3840 0.2080 22 0.3383 0.2052 23 0.3362 0.1987 24 0.3248 0.1975 25 0.3143 0.1956 26 0.3043 0.1952 27 0.3018 0.1888 28 0.2974 0.1766 29 0.2949 0.1764 30 0.2933 0.1758 31 0.2837 0.1727 32 0.2829 0.1722 33 0.2782 0.1687 34 0.2755 0.1672 35 0.2627 0.1668 36 0.2617 0.1666 37 0.2598 0.1643 38 0.2537 0.1613 39 0.2501 0.1599 40 0.2476 0.1535 41 0.2437 0.1487 42 0.2399 0.1470 43 0.2235 0.1389 44 0.2211 0.1364 45 0.2071 0.1343 46 0.2062 0.1333 47 0.2027 0.1333 48 0.1897 0.1301 49 0.1696 0.1289 50 0.1554 0.1274 51 0.1516 0.1248 52 0.1447 0.1240 53 0.1287 0.1141 54 0.1262 0.1138 55 0.1113 0.1107 56 0.0881 0.0910 2210919-West Basin 7/29/2022 9:08:51 AM Page 13 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.1496 16549 14947 90 Pass 0.1602 13871 8604 62 Pass 0.1708 11780 5771 48 Pass 0.1814 9936 3957 39 Pass 0.1920 8571 2965 34 Pass 0.2025 7275 2272 31 Pass 0.2131 6195 1890 30 Pass 0.2237 5365 1631 30 Pass 0.2343 4636 1400 30 Pass 0.2449 4006 1181 29 Pass 0.2555 3424 989 28 Pass 0.2661 2945 847 28 Pass 0.2767 2551 760 29 Pass 0.2873 2172 660 30 Pass 0.2979 1888 567 30 Pass 0.3085 1629 486 29 Pass 0.3191 1387 444 32 Pass 0.3297 1232 407 33 Pass 0.3403 1052 366 34 Pass 0.3509 928 324 34 Pass 0.3614 794 287 36 Pass 0.3720 666 263 39 Pass 0.3826 582 241 41 Pass 0.3932 499 222 44 Pass 0.4038 422 206 48 Pass 0.4144 358 171 47 Pass 0.4250 321 149 46 Pass 0.4356 286 143 50 Pass 0.4462 246 131 53 Pass 0.4568 216 121 56 Pass 0.4674 179 111 62 Pass 0.4780 158 99 62 Pass 0.4886 138 93 67 Pass 0.4992 113 88 77 Pass 0.5098 96 82 85 Pass 0.5203 82 76 92 Pass 0.5309 72 70 97 Pass 0.5415 60 62 103 Pass 0.5521 55 55 100 Pass 0.5627 51 48 94 Pass 0.5733 47 40 85 Pass 0.5839 42 31 73 Pass 0.5945 39 16 41 Pass 0.6051 34 14 41 Pass 0.6157 29 11 37 Pass 0.6263 22 9 40 Pass 0.6369 15 7 46 Pass 0.6475 8 4 50 Pass 0.6581 5 0 0 Pass 0.6687 5 0 0 Pass 0.6792 5 0 0 Pass 0.6898 5 0 0 Pass 0.7004 5 0 0 Pass 2210919-West Basin 7/29/2022 9:08:51 AM Page 14 0.7110 5 0 0 Pass 0.7216 5 0 0 Pass 0.7322 5 0 0 Pass 0.7428 4 0 0 Pass 0.7534 4 0 0 Pass 0.7640 4 0 0 Pass 0.7746 4 0 0 Pass 0.7852 3 0 0 Pass 0.7958 3 0 0 Pass 0.8064 3 0 0 Pass 0.8170 3 0 0 Pass 0.8275 3 0 0 Pass 0.8381 3 0 0 Pass 0.8487 3 0 0 Pass 0.8593 3 0 0 Pass 0.8699 3 0 0 Pass 0.8805 3 0 0 Pass 0.8911 3 0 0 Pass 0.9017 3 0 0 Pass 0.9123 3 0 0 Pass 0.9229 2 0 0 Pass 0.9335 2 0 0 Pass 0.9441 2 0 0 Pass 0.9547 2 0 0 Pass 0.9653 2 0 0 Pass 0.9759 2 0 0 Pass 0.9864 2 0 0 Pass 0.9970 2 0 0 Pass 1.0076 2 0 0 Pass 1.0182 1 0 0 Pass 1.0288 1 0 0 Pass 1.0394 1 0 0 Pass 1.0500 1 0 0 Pass 1.0606 1 0 0 Pass 1.0712 1 0 0 Pass 1.0818 1 0 0 Pass 1.0924 1 0 0 Pass 1.1030 1 0 0 Pass 1.1136 1 0 0 Pass 1.1242 1 0 0 Pass 1.1348 1 0 0 Pass 1.1453 1 0 0 Pass 1.1559 1 0 0 Pass 1.1665 1 0 0 Pass 1.1771 1 0 0 Pass 1.1877 1 0 0 Pass 1.1983 1 0 0 Pass 2210919-West Basin 7/29/2022 9:08:51 AM Page 15 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. 2210919-West Basin 7/29/2022 9:08:51 AM Page 16 LID Report 2210919-West Basin 7/29/2022 9:08:58 AM Page 17 POC 2 POC #2 was not reported because POC must exist in both scenarios and both scenarios must have been run. 2210919-West Basin 7/29/2022 9:08:58 AM Page 18 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. 2210919-West Basin 7/29/2022 9:08:58 AM Page 19 Appendix Predeveloped Schematic 2210919-West Basin 7/29/2022 9:08:58 AM Page 20 Mitigated Schematic 2210919-West Basin 7/29/2022 9:08:59 AM Page 21 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2011 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 2210919-West Basin.wdm MESSU 25 Pre2210919-West Basin.MES 27 Pre2210919-West Basin.L61 28 Pre2210919-West Basin.L62 30 POC2210919-West Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 PERLND 12 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Existing West Basin 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 *** 11 C, Forest, Mod 1 1 1 1 27 0 12 C, Forest, Steep 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 *** 11 0 0 1 0 0 0 0 0 0 0 0 0 12 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 ********* 2210919-West Basin 7/29/2022 9:08:59 AM Page 22 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 12 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 12 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 11 0 4.5 0.08 400 0.1 0.5 0.996 12 0 4.5 0.08 400 0.15 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 12 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 12 0.2 0.3 0.35 6 0.3 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 11 0 0 0 0 2.5 1 0 12 0 0 0 0 2.5 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 2210919-West Basin 7/29/2022 9:08:59 AM Page 23 <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 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Existing West Basin*** PERLND 11 5.693 COPY 501 12 PERLND 11 5.693 COPY 501 13 PERLND 12 0.832 COPY 501 12 PERLND 12 0.832 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 2210919-West Basin 7/29/2022 9:08:59 AM Page 24 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 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 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*** 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 2210919-West Basin 7/29/2022 9:08:59 AM Page 25 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2011 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 2210919-West Basin.wdm MESSU 25 Mit2210919-West Basin.MES 27 Mit2210919-West Basin.L61 28 Mit2210919-West Basin.L62 31 POC2210919-West Basin2.dat 30 POC2210919-West Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 13 IMPLND 2 IMPLND 4 IMPLND 6 IMPLND 9 PERLND 17 RCHRES 1 COPY 502 COPY 1 COPY 501 COPY 601 DISPLY 2 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 2 Dev West Basin MAX 1 2 31 9 1 West Pond MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 502 1 1 501 1 1 601 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 *** 13 C, Pasture, Flat 1 1 1 1 27 0 17 C, Lawn, Mod 1 1 1 1 27 0 2210919-West Basin 7/29/2022 9:08:59 AM Page 26 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 13 0 0 1 0 0 0 0 0 0 0 0 0 17 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 ********* 13 0 0 4 0 0 0 0 0 0 0 0 0 1 9 17 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 13 0 0 0 0 0 0 0 0 0 0 0 17 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 13 0 4.5 0.06 400 0.05 0.5 0.996 17 0 4.5 0.03 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 13 0 0 2 2 0 0 0 17 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 13 0.15 0.4 0.3 6 0.5 0.4 17 0.1 0.25 0.25 6 0.5 0.25 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 13 0 0 0 0 2.5 1 0 17 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 2 ROADS/MOD 1 1 1 27 0 4 ROOF TOPS/FLAT 1 1 1 27 0 6 DRIVEWAYS/MOD 1 1 1 27 0 9 SIDEWALKS/MOD 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 2 0 0 1 0 0 0 2210919-West Basin 7/29/2022 9:08:59 AM Page 27 4 0 0 1 0 0 0 6 0 0 1 0 0 0 9 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 2 0 0 4 0 0 0 1 9 4 0 0 4 0 0 0 1 9 6 0 0 4 0 0 0 1 9 9 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 *** 2 0 0 0 0 0 4 0 0 0 0 0 6 0 0 0 0 0 9 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 2 400 0.05 0.1 0.08 4 400 0.01 0.1 0.1 6 400 0.05 0.1 0.08 9 400 0.05 0.1 0.08 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 2 0 0 4 0 0 6 0 0 9 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 2 0 0 4 0 0 6 0 0 9 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Dev West Basin*** PERLND 13 3.914 RCHRES 1 2 PERLND 13 3.914 RCHRES 1 3 IMPLND 2 1.198 RCHRES 1 5 IMPLND 4 1.888 RCHRES 1 5 IMPLND 6 0.574 RCHRES 1 5 IMPLND 9 0.375 RCHRES 1 5 Dev West Basin*** PERLND 13 3.914 COPY 502 12 PERLND 13 3.914 COPY 502 13 IMPLND 2 1.198 COPY 502 15 IMPLND 4 1.888 COPY 502 15 IMPLND 6 0.574 COPY 502 15 IMPLND 9 0.375 COPY 502 15 West Bypass*** 2210919-West Basin 7/29/2022 9:08:59 AM Page 28 PERLND 13 0.812 COPY 501 12 PERLND 13 0.812 COPY 601 12 PERLND 13 0.812 COPY 501 13 PERLND 13 0.812 COPY 601 13 PERLND 17 0.172 COPY 501 12 PERLND 17 0.172 COPY 601 12 PERLND 17 0.172 COPY 501 13 PERLND 17 0.172 COPY 601 13 ******Routing****** PERLND 13 3.914 COPY 1 12 IMPLND 2 1.198 COPY 1 15 IMPLND 4 1.888 COPY 1 15 IMPLND 6 0.574 COPY 1 15 IMPLND 9 0.375 COPY 1 15 PERLND 13 3.914 COPY 1 13 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 502 OUTPUT MEAN 1 1 48.4 DISPLY 2 INPUT TIMSER 1 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 West Pond 1 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 0 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 0.03 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 <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 2210919-West Basin 7/29/2022 9:08:59 AM Page 29 1 0 4.0 0.0 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 FTABLES FTABLE 1 91 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.297521 0.000000 0.000000 0.088889 0.300613 0.026584 0.016719 0.177778 0.303718 0.053443 0.023644 0.266667 0.306836 0.080579 0.028957 0.355556 0.309967 0.107992 0.033437 0.444444 0.313111 0.135684 0.037384 0.533333 0.316268 0.163657 0.040952 0.622222 0.319438 0.191910 0.044233 0.711111 0.322622 0.220446 0.047287 0.800000 0.325818 0.249266 0.050156 0.888889 0.329028 0.278370 0.052869 0.977778 0.332250 0.307760 0.055449 1.066667 0.335486 0.337437 0.057915 1.155556 0.338734 0.367403 0.060280 1.244444 0.341996 0.397657 0.062555 1.333333 0.345271 0.428203 0.064751 1.422222 0.348559 0.459040 0.066874 1.511111 0.351860 0.490169 0.068932 1.600000 0.355174 0.521593 0.070931 1.688889 0.358501 0.553312 0.072874 1.777778 0.361841 0.585327 0.074768 1.866667 0.365194 0.617640 0.076614 1.955556 0.368560 0.650251 0.078417 2.044444 0.371939 0.683162 0.080179 2.133333 0.375331 0.716374 0.081904 2.222222 0.378737 0.749888 0.083593 2.311111 0.382155 0.783706 0.085248 2.400000 0.385587 0.817827 0.086872 2.488889 0.389031 0.852255 0.088466 2.577778 0.392489 0.886989 0.090032 2.666667 0.395960 0.922031 0.091571 2.755556 0.399443 0.957383 0.093085 2.844444 0.402940 0.993044 0.094574 2.933333 0.406450 1.029017 0.096041 3.022222 0.409973 1.065302 0.097485 3.111111 0.413509 1.101902 0.098908 3.200000 0.417058 1.138816 0.100311 3.288889 0.420620 1.176046 0.101695 3.377778 0.424195 1.213593 0.103060 3.466667 0.427783 1.251459 0.104407 3.555556 0.431385 1.289644 0.105737 3.644444 0.434999 1.328150 0.107051 3.733333 0.438626 1.366978 0.108348 3.822222 0.442267 1.406129 0.109631 3.911111 0.445920 1.445603 0.110898 4.000000 0.449587 1.485404 0.112151 4.088889 0.453266 1.525531 0.113391 4.177778 0.456959 1.565985 0.114616 4.266667 0.460665 1.606768 0.115829 4.355556 0.464384 1.647882 0.117030 4.444444 0.468115 1.689326 0.118218 4.533333 0.471860 1.731103 0.119394 4.622222 0.475618 1.773213 0.120559 4.711111 0.479389 1.815658 0.121713 4.800000 0.483174 1.858438 0.122856 4.888889 0.486971 1.901556 0.123988 4.977778 0.490781 1.945011 0.125110 5.066667 0.494604 1.988806 0.126222 5.155556 0.498441 2.032942 0.127325 2210919-West Basin 7/29/2022 9:08:59 AM Page 30 5.244444 0.502290 2.077419 0.128417 5.333333 0.506152 2.122238 0.129501 5.422222 0.510028 2.167402 0.130576 5.511111 0.513917 2.212910 0.131642 5.600000 0.517818 2.258765 0.132699 5.688889 0.521733 2.304968 0.133748 5.777778 0.525661 2.351518 0.134789 5.866667 0.529601 2.398419 0.135822 5.955556 0.533555 2.445670 0.136847 6.044444 0.537522 2.493274 0.137865 6.133333 0.541502 2.541230 0.138875 6.222222 0.545495 2.589541 0.139877 6.311111 0.549501 2.638208 0.153296 6.400000 0.553521 2.687231 0.188774 6.488889 0.557553 2.736612 0.235402 6.577778 0.561598 2.786352 0.289803 6.666667 0.565657 2.836453 0.350035 6.755556 0.569728 2.886914 0.414743 6.844444 0.573812 2.937738 0.482892 6.933333 0.577910 2.988926 0.553641 7.022222 0.582021 3.040478 0.660950 7.111111 0.586144 3.092397 1.196956 7.200000 0.590281 3.144682 2.014547 7.288889 0.594431 3.197336 2.985733 7.377778 0.598594 3.250359 3.998212 7.466667 0.602770 3.303753 4.938870 7.555556 0.606958 3.357519 5.711107 7.644444 0.611160 3.411658 6.264077 7.733333 0.615376 3.466170 6.629545 7.822222 0.619604 3.521058 7.042390 7.911111 0.623845 3.576323 7.381714 8.000000 0.628099 3.631965 7.704889 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 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 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*** COPY 2 OUTPUT MEAN 1 1 48.4 WDM 702 FLOW ENGL REPL COPY 502 OUTPUT MEAN 1 1 48.4 WDM 802 FLOW ENGL REPL COPY 602 OUTPUT MEAN 1 1 48.4 WDM 902 FLOW ENGL REPL RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 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 COPY 601 OUTPUT MEAN 1 1 48.4 WDM 901 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 2210919-West Basin 7/29/2022 9:08:59 AM Page 31 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 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 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN 2210919-West Basin 7/29/2022 9:08:59 AM Page 32 Predeveloped HSPF Message File 2210919-West Basin 7/29/2022 9:08:59 AM Page 33 Mitigated HSPF Message File 2210919-West Basin 7/29/2022 9:08:59 AM Page 34 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. 2005-2022; 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 B-4 2210919-East Basin 7/29/2022 9:20:35 AM Page 2 General Model Information Project Name:2210919-East Basin Site Name:Summit at Thompson Site Address:Berry Valley City:Yelm Report Date:7/29/2022 Gage:Eaton Creek Data Start:1955/10/01 Data End:2011/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2019/09/13 Version:4.2.17 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Low Flow Threshold for POC2:50 Percent of the 2 Year High Flow Threshold for POC2:50 Year 2210919-East Basin 7/29/2022 9:20:35 AM Page 3 Landuse Basin Data Predeveloped Land Use Existing East Basin Bypass:No GroundWater:No Pervious Land Use acre A B, Forest, Mod 6.065 A B, Forest, Steep 1.197 A B, Lawn, Mod 1.755 Pervious Total 9.017 Impervious Land Use acre Impervious Total 0 Basin Total 9.017 Element Flows To: Surface Interflow Groundwater 2210919-East Basin 7/29/2022 9:20:35 AM Page 4 Mitigated Land Use Dev East Basin Bypass:No GroundWater:No Pervious Land Use acre A B, Pasture, Flat 1.872 A B, Forest, Mod 1.863 A B, Lawn, Mod 1.755 A B, Forest, Steep 0.344 Pervious Total 5.834 Impervious Land Use acre ROADS MOD 0.654 ROOF TOPS FLAT 0.235 DRIVEWAYS MOD 0.287 SIDEWALKS MOD 0.244 Impervious Total 1.42 Basin Total 7.254 Element Flows To: Surface Interflow Groundwater Surface Bioretention Surface Bioretention 2210919-East Basin 7/29/2022 9:20:35 AM Page 5 East Bypass Bypass:Yes GroundWater:No Pervious Land Use acre A B, Pasture, Flat 0.663 Pervious Total 0.663 Impervious Land Use acre ROOF TOPS FLAT 0.023 Impervious Total 0.023 Basin Total 0.686 Element Flows To: Surface Interflow Groundwater 2210919-East Basin 7/29/2022 9:20:35 AM Page 6 Routing Elements Predeveloped Routing 2210919-East Basin 7/29/2022 9:20:35 AM Page 7 Mitigated Routing West Pond Bottom Length:90.00 ft. Bottom Width:40.00 ft. Depth:3 ft. Volume at riser head:0.0919 acre-feet. Infiltration On Infiltration rate:4 Infiltration safety factor:1 Wetted surface area On Total Volume Infiltrated (ac-ft.):9.813 Total Volume Through Riser (ac-ft.):0 Total Volume Through Facility (ac-ft.):9.813 Percent Infiltrated:100 Total Precip Applied to Facility:0 Total Evap From Facility:0 Side slope 1:3 To 1 Side slope 2:3 To 1 Side slope 3:3 To 1 Side slope 4:3 To 1 Discharge Structure Riser Height:1 ft. Riser Diameter:18 in. Element Flows To: Outlet 1 Outlet 2 Pond Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.082 0.000 0.000 0.000 0.0333 0.083 0.002 0.000 0.335 0.0667 0.083 0.005 0.000 0.338 0.1000 0.084 0.008 0.000 0.340 0.1333 0.085 0.011 0.000 0.343 0.1667 0.085 0.014 0.000 0.345 0.2000 0.086 0.016 0.000 0.347 0.2333 0.086 0.019 0.000 0.350 0.2667 0.087 0.022 0.000 0.352 0.3000 0.088 0.025 0.000 0.355 0.3333 0.088 0.028 0.000 0.357 0.3667 0.089 0.031 0.000 0.360 0.4000 0.089 0.034 0.000 0.362 0.4333 0.090 0.037 0.000 0.365 0.4667 0.091 0.040 0.000 0.367 0.5000 0.091 0.043 0.000 0.370 0.5333 0.092 0.046 0.000 0.372 0.5667 0.093 0.049 0.000 0.375 0.6000 0.093 0.052 0.000 0.377 0.6333 0.094 0.056 0.000 0.380 0.6667 0.094 0.059 0.000 0.383 0.7000 0.095 0.062 0.000 0.385 0.7333 0.096 0.065 0.000 0.388 0.7667 0.096 0.068 0.000 0.390 0.8000 0.097 0.072 0.000 0.393 0.8333 0.098 0.075 0.000 0.395 2210919-East Basin 7/29/2022 9:20:35 AM Page 8 0.8667 0.098 0.078 0.000 0.398 0.9000 0.099 0.081 0.000 0.401 0.9333 0.100 0.085 0.000 0.403 0.9667 0.100 0.088 0.000 0.406 1.0000 0.101 0.091 0.000 0.408 1.0333 0.102 0.095 0.096 0.411 1.0667 0.102 0.098 0.273 0.414 1.1000 0.103 0.102 0.502 0.416 1.1333 0.104 0.105 0.771 0.419 1.1667 0.104 0.109 1.074 0.422 1.2000 0.105 0.112 1.404 0.424 1.2333 0.106 0.116 1.756 0.427 1.2667 0.106 0.119 2.123 0.430 1.3000 0.107 0.123 2.501 0.432 1.3333 0.108 0.126 2.882 0.435 1.3667 0.108 0.130 3.261 0.438 1.4000 0.109 0.134 3.632 0.441 1.4333 0.110 0.137 3.988 0.443 1.4667 0.110 0.141 4.326 0.446 1.5000 0.111 0.145 4.639 0.449 1.5333 0.112 0.148 4.924 0.451 1.5667 0.112 0.152 5.178 0.454 1.6000 0.113 0.156 5.401 0.457 1.6333 0.114 0.160 5.592 0.460 1.6667 0.114 0.163 5.754 0.463 1.7000 0.115 0.167 5.892 0.465 1.7333 0.116 0.171 6.014 0.468 1.7667 0.116 0.175 6.205 0.471 1.8000 0.117 0.179 6.338 0.474 1.8333 0.118 0.183 6.469 0.476 1.8667 0.118 0.187 6.597 0.479 1.9000 0.119 0.191 6.723 0.482 1.9333 0.120 0.195 6.846 0.485 1.9667 0.121 0.199 6.967 0.488 2.0000 0.121 0.203 7.086 0.491 2.0333 0.122 0.207 7.203 0.494 2.0667 0.123 0.211 7.319 0.496 2.1000 0.123 0.215 7.432 0.499 2.1333 0.124 0.219 7.544 0.502 2.1667 0.125 0.223 7.654 0.505 2.2000 0.126 0.228 7.763 0.508 2.2333 0.126 0.232 7.870 0.511 2.2667 0.127 0.236 7.975 0.514 2.3000 0.128 0.240 8.080 0.517 2.3333 0.128 0.245 8.183 0.520 2.3667 0.129 0.249 8.284 0.522 2.4000 0.130 0.253 8.385 0.525 2.4333 0.131 0.258 8.484 0.528 2.4667 0.131 0.262 8.582 0.531 2.5000 0.132 0.266 8.679 0.534 2.5333 0.133 0.271 8.775 0.537 2.5667 0.134 0.275 8.870 0.540 2.6000 0.134 0.280 8.964 0.543 2.6333 0.135 0.284 9.056 0.546 2.6667 0.136 0.289 9.148 0.549 2.7000 0.137 0.293 9.239 0.552 2.7333 0.137 0.298 9.330 0.555 2.7667 0.138 0.303 9.419 0.558 2210919-East Basin 7/29/2022 9:20:35 AM Page 9 2.8000 0.139 0.307 9.507 0.561 2.8333 0.140 0.312 9.595 0.564 2.8667 0.140 0.317 9.682 0.567 2.9000 0.141 0.321 9.768 0.570 2.9333 0.142 0.326 9.853 0.573 2.9667 0.143 0.331 9.938 0.576 3.0000 0.143 0.336 10.02 0.580 3.0333 0.144 0.340 10.10 0.583 2210919-East Basin 7/29/2022 9:20:35 AM Page 10 East Bioretention Bottom Length: 130.00 ft. Bottom Width: 10.00 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 0 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate:4 Infiltration safety factor:1 Wetted surface area On Total Volume Infiltrated (ac-ft.):268.662 Total Volume Through Riser (ac-ft.):9.813 Total Volume Through Facility (ac-ft.):278.475 Percent Infiltrated:96.48 Total Precip Applied to Facility:10.139 Total Evap From Facility:3.222 Underdrain not used Discharge Structure Riser Height:0.5 ft. Riser Diameter:18 in. Element Flows To: Outlet 1 Outlet 2 West Pond Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.0606 0.0000 0.0000 0.0000 0.0275 0.0603 0.0004 0.0000 0.0000 0.0549 0.0597 0.0008 0.0000 0.0000 0.0824 0.0591 0.0012 0.0000 0.0000 0.1099 0.0585 0.0016 0.0000 0.0000 0.1374 0.0579 0.0020 0.0000 0.0000 0.1648 0.0573 0.0024 0.0005 0.0005 0.1923 0.0567 0.0028 0.0007 0.0007 0.2198 0.0561 0.0032 0.0009 0.0009 0.2473 0.0555 0.0036 0.0013 0.0013 0.2747 0.0549 0.0041 0.0016 0.0016 0.3022 0.0544 0.0045 0.0021 0.0021 0.3297 0.0538 0.0050 0.0026 0.0026 0.3571 0.0532 0.0054 0.0032 0.0032 0.3846 0.0526 0.0059 0.0039 0.0039 0.4121 0.0520 0.0064 0.0047 0.0047 0.4396 0.0515 0.0069 0.0056 0.0056 0.4670 0.0509 0.0073 0.0066 0.0066 0.4945 0.0503 0.0078 0.0077 0.0077 0.5220 0.0497 0.0083 0.0089 0.0089 0.5495 0.0492 0.0089 0.0102 0.0102 0.5769 0.0486 0.0094 0.0117 0.0117 0.6044 0.0480 0.0099 0.0133 0.0133 0.6319 0.0474 0.0104 0.0150 0.0150 0.6593 0.0469 0.0110 0.0169 0.0169 0.6868 0.0463 0.0115 0.0189 0.0189 0.7143 0.0457 0.0120 0.0211 0.0211 2210919-East Basin 7/29/2022 9:20:35 AM Page 11 0.7418 0.0452 0.0126 0.0235 0.0235 0.7692 0.0446 0.0132 0.0260 0.0260 0.7967 0.0440 0.0137 0.0287 0.0287 0.8242 0.0435 0.0143 0.0316 0.0316 0.8516 0.0429 0.0149 0.0347 0.0347 0.8791 0.0424 0.0155 0.0380 0.0380 0.9066 0.0418 0.0161 0.0415 0.0415 0.9341 0.0412 0.0167 0.0452 0.0452 0.9615 0.0407 0.0173 0.0491 0.0491 0.9890 0.0401 0.0179 0.0533 0.0533 1.0165 0.0396 0.0186 0.0576 0.0576 1.0440 0.0390 0.0192 0.0623 0.0623 1.0714 0.0385 0.0198 0.0672 0.0672 1.0989 0.0379 0.0205 0.0723 0.0723 1.1264 0.0374 0.0211 0.0777 0.0777 1.1538 0.0368 0.0218 0.0834 0.0834 1.1813 0.0363 0.0225 0.0894 0.0894 1.2088 0.0357 0.0232 0.0956 0.0956 1.2363 0.0352 0.0238 0.1022 0.1022 1.2637 0.0347 0.0245 0.1091 0.1091 1.2912 0.0341 0.0252 0.1162 0.1162 1.3187 0.0336 0.0260 0.1237 0.1237 1.3462 0.0330 0.0267 0.1316 0.1316 1.3736 0.0325 0.0274 0.1397 0.1397 1.4011 0.0320 0.0281 0.1482 0.1482 1.4286 0.0314 0.0289 0.1570 0.1570 1.4560 0.0309 0.0296 0.1662 0.1662 1.4835 0.0304 0.0304 0.1756 0.1756 1.5000 0.0298 0.0308 0.2445 0.2445 Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)To Amended(cfs)Infilt(cfs) 1.5000 0.0606 0.0308 0.0000 0.0903 0.0024 1.5275 0.0612 0.0325 0.0000 0.0903 0.0048 1.5549 0.0618 0.0342 0.0000 0.0936 0.0073 1.5824 0.0624 0.0359 0.0000 0.0952 0.0097 1.6099 0.0630 0.0376 0.0000 0.0969 0.0121 1.6374 0.0636 0.0394 0.0000 0.0985 0.0146 1.6648 0.0642 0.0411 0.0000 0.1002 0.0170 1.6923 0.0648 0.0429 0.0000 0.1019 0.0195 1.7198 0.0655 0.0447 0.0000 0.1035 0.0219 1.7473 0.0661 0.0465 0.0000 0.1052 0.0244 1.7747 0.0667 0.0483 0.0000 0.1068 0.0268 1.8022 0.0673 0.0501 0.0000 0.1085 0.0293 1.8297 0.0679 0.0520 0.0000 0.1101 0.0318 1.8571 0.0685 0.0539 0.0000 0.1118 0.0343 1.8846 0.0691 0.0558 0.0000 0.1134 0.0367 1.9121 0.0697 0.0577 0.0000 0.1151 0.0392 1.9396 0.0704 0.0596 0.0000 0.1167 0.0417 1.9670 0.0710 0.0615 0.0000 0.1184 0.0442 1.9945 0.0716 0.0635 0.0000 0.1200 0.0467 2.0220 0.0722 0.0655 0.0000 0.1204 0.0492 2.0495 0.0728 0.0675 0.0000 0.1204 0.0518 2.0769 0.0735 0.0695 0.0000 0.1204 0.0543 2.1044 0.0741 0.0715 0.0000 0.1204 0.0568 2.1319 0.0747 0.0735 0.0000 0.1204 0.0593 2.1593 0.0753 0.0756 0.0000 0.1204 0.0619 2.1868 0.0760 0.0777 0.0000 0.1204 0.0644 2210919-East Basin 7/29/2022 9:20:35 AM Page 12 2.2143 0.0766 0.0798 0.0000 0.1204 0.0669 2.2418 0.0772 0.0819 0.0000 0.1204 0.0695 2.2692 0.0779 0.0840 0.0000 0.1204 0.0720 2.2967 0.0785 0.0862 0.0000 0.1204 0.0746 2.3242 0.0791 0.0883 0.0000 0.1204 0.0772 2.3516 0.0798 0.0905 0.0000 0.1204 0.0797 2.3791 0.0804 0.0927 0.0000 0.1204 0.0823 2.4066 0.0810 0.0949 0.0000 0.1204 0.0849 2.4341 0.0817 0.0972 0.0000 0.1204 0.0875 2.4615 0.0823 0.0994 0.0000 0.1204 0.0901 2.4890 0.0830 0.1017 0.0000 0.1204 0.0911 2.5000 0.0832 0.1026 0.0000 0.1204 0.0000 2210919-East Basin 7/29/2022 9:20:35 AM Page 13 Surface Bioretention Element Flows To: Outlet 1 Outlet 2 West Pond East Bioretention 2210919-East Basin 7/29/2022 9:20:35 AM Page 14 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:9.017 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:6.497 Total Impervious Area:1.443 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.067878 5 year 0.22687 10 year 0.414809 25 year 0.77357 50 year 1.144352 100 year 1.615649 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.011917 5 year 0.020201 10 year 0.027716 25 year 0.040093 50 year 0.051811 100 year 0.066056 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1956 0.261 0.023 1957 0.316 0.018 1958 0.093 0.008 1959 0.044 0.009 1960 0.110 0.013 1961 0.244 0.020 1962 0.007 0.012 1963 0.475 0.045 1964 0.066 0.010 1965 0.190 0.017 2210919-East Basin 7/29/2022 9:20:55 AM Page 15 1966 0.021 0.007 1967 0.241 0.019 1968 0.069 0.010 1969 0.031 0.007 1970 0.058 0.008 1971 0.346 0.025 1972 0.772 0.059 1973 0.019 0.008 1974 0.093 0.012 1975 0.053 0.009 1976 0.109 0.011 1977 0.006 0.013 1978 0.206 0.020 1979 0.019 0.013 1980 0.072 0.008 1981 0.594 0.025 1982 0.075 0.018 1983 0.117 0.018 1984 0.104 0.013 1985 0.009 0.008 1986 0.167 0.015 1987 0.237 0.020 1988 0.007 0.006 1989 0.372 0.019 1990 0.033 0.008 1991 1.211 0.113 1992 0.172 0.011 1993 0.022 0.022 1994 0.007 0.011 1995 0.061 0.014 1996 0.286 0.019 1997 0.112 0.009 1998 0.388 0.017 1999 0.146 0.012 2000 0.031 0.007 2001 0.007 0.007 2002 0.003 0.005 2003 0.006 0.010 2004 0.077 0.012 2005 0.003 0.008 2006 0.022 0.006 2007 0.255 0.020 2008 0.007 0.007 2009 0.061 0.008 2010 0.039 0.013 2011 0.042 0.007 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 1.2110 0.1134 2 0.7717 0.0594 3 0.5942 0.0450 4 0.4748 0.0251 5 0.3879 0.0249 6 0.3717 0.0228 7 0.3455 0.0215 8 0.3158 0.0201 2210919-East Basin 7/29/2022 9:20:55 AM Page 16 9 0.2857 0.0198 10 0.2608 0.0196 11 0.2550 0.0196 12 0.2439 0.0189 13 0.2408 0.0187 14 0.2366 0.0186 15 0.2063 0.0183 16 0.1897 0.0180 17 0.1719 0.0175 18 0.1667 0.0175 19 0.1457 0.0165 20 0.1171 0.0153 21 0.1121 0.0144 22 0.1101 0.0133 23 0.1091 0.0132 24 0.1040 0.0131 25 0.0928 0.0127 26 0.0927 0.0126 27 0.0775 0.0120 28 0.0751 0.0118 29 0.0724 0.0118 30 0.0688 0.0117 31 0.0664 0.0113 32 0.0610 0.0107 33 0.0605 0.0106 34 0.0578 0.0105 35 0.0527 0.0099 36 0.0441 0.0097 37 0.0420 0.0094 38 0.0387 0.0090 39 0.0327 0.0088 40 0.0310 0.0084 41 0.0306 0.0082 42 0.0222 0.0082 43 0.0217 0.0082 44 0.0208 0.0081 45 0.0188 0.0080 46 0.0185 0.0078 47 0.0089 0.0078 48 0.0075 0.0071 49 0.0071 0.0070 50 0.0070 0.0070 51 0.0069 0.0068 52 0.0067 0.0068 53 0.0064 0.0066 54 0.0059 0.0059 55 0.0033 0.0056 56 0.0030 0.0053 2210919-East Basin 7/29/2022 9:20:55 AM Page 17 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0339 424 4 0 Pass 0.0452 319 3 0 Pass 0.0564 241 2 0 Pass 0.0676 192 1 0 Pass 0.0788 160 1 0 Pass 0.0900 130 1 0 Pass 0.1012 106 1 0 Pass 0.1125 85 1 1 Pass 0.1237 72 0 0 Pass 0.1349 64 0 0 Pass 0.1461 56 0 0 Pass 0.1573 50 0 0 Pass 0.1685 43 0 0 Pass 0.1798 37 0 0 Pass 0.1910 34 0 0 Pass 0.2022 29 0 0 Pass 0.2134 25 0 0 Pass 0.2246 24 0 0 Pass 0.2358 23 0 0 Pass 0.2470 19 0 0 Pass 0.2583 17 0 0 Pass 0.2695 15 0 0 Pass 0.2807 15 0 0 Pass 0.2919 14 0 0 Pass 0.3031 14 0 0 Pass 0.3143 12 0 0 Pass 0.3256 10 0 0 Pass 0.3368 10 0 0 Pass 0.3480 8 0 0 Pass 0.3592 7 0 0 Pass 0.3704 6 0 0 Pass 0.3816 5 0 0 Pass 0.3929 4 0 0 Pass 0.4041 4 0 0 Pass 0.4153 4 0 0 Pass 0.4265 4 0 0 Pass 0.4377 4 0 0 Pass 0.4489 4 0 0 Pass 0.4602 4 0 0 Pass 0.4714 4 0 0 Pass 0.4826 3 0 0 Pass 0.4938 3 0 0 Pass 0.5050 3 0 0 Pass 0.5162 3 0 0 Pass 0.5275 3 0 0 Pass 0.5387 3 0 0 Pass 0.5499 3 0 0 Pass 0.5611 3 0 0 Pass 0.5723 3 0 0 Pass 0.5835 3 0 0 Pass 0.5948 3 0 0 Pass 0.6060 2 0 0 Pass 0.6172 2 0 0 Pass 2210919-East Basin 7/29/2022 9:20:55 AM Page 18 0.6284 2 0 0 Pass 0.6396 2 0 0 Pass 0.6508 2 0 0 Pass 0.6621 2 0 0 Pass 0.6733 2 0 0 Pass 0.6845 2 0 0 Pass 0.6957 2 0 0 Pass 0.7069 2 0 0 Pass 0.7181 2 0 0 Pass 0.7293 2 0 0 Pass 0.7406 2 0 0 Pass 0.7518 2 0 0 Pass 0.7630 2 0 0 Pass 0.7742 1 0 0 Pass 0.7854 1 0 0 Pass 0.7966 1 0 0 Pass 0.8079 1 0 0 Pass 0.8191 1 0 0 Pass 0.8303 1 0 0 Pass 0.8415 1 0 0 Pass 0.8527 1 0 0 Pass 0.8639 1 0 0 Pass 0.8752 1 0 0 Pass 0.8864 1 0 0 Pass 0.8976 1 0 0 Pass 0.9088 1 0 0 Pass 0.9200 1 0 0 Pass 0.9312 1 0 0 Pass 0.9425 1 0 0 Pass 0.9537 1 0 0 Pass 0.9649 1 0 0 Pass 0.9761 1 0 0 Pass 0.9873 1 0 0 Pass 0.9985 1 0 0 Pass 1.0098 1 0 0 Pass 1.0210 1 0 0 Pass 1.0322 1 0 0 Pass 1.0434 1 0 0 Pass 1.0546 1 0 0 Pass 1.0658 1 0 0 Pass 1.0771 1 0 0 Pass 1.0883 1 0 0 Pass 1.0995 1 0 0 Pass 1.1107 1 0 0 Pass 1.1219 1 0 0 Pass 1.1331 1 0 0 Pass 1.1444 1 0 0 Pass 2210919-East Basin 7/29/2022 9:20:55 AM Page 19 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. 2210919-East Basin 7/29/2022 9:20:55 AM Page 20 LID Report 2210919-East Basin 7/29/2022 9:21:01 AM Page 21 POC 2 POC #2 was not reported because POC must exist in both scenarios and both scenarios must have been run. 2210919-East Basin 7/29/2022 9:21:01 AM Page 22 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. 2210919-East Basin 7/29/2022 9:21:01 AM Page 23 Appendix Predeveloped Schematic 2210919-East Basin 7/29/2022 9:21:01 AM Page 24 Mitigated Schematic 2210919-East Basin 7/29/2022 9:21:01 AM Page 25 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2011 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 2210919-East Basin.wdm MESSU 25 Pre2210919-East Basin.MES 27 Pre2210919-East Basin.L61 28 Pre2210919-East Basin.L62 30 POC2210919-East Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 2 PERLND 3 PERLND 8 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Existing East Basin 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 *** 2 A/B, Forest, Mod 1 1 1 1 27 0 3 A/B, Forest, Steep 1 1 1 1 27 0 8 A/B, Lawn, Mod 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 *** 2 0 0 1 0 0 0 0 0 0 0 0 0 3 0 0 1 0 0 0 0 0 0 0 0 0 8 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY 2210919-East Basin 7/29/2022 9:21:01 AM Page 26 PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 2 0 0 4 0 0 0 0 0 0 0 0 0 1 9 3 0 0 4 0 0 0 0 0 0 0 0 0 1 9 8 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 2 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 8 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 2 0 5 2 400 0.1 0.3 0.996 3 0 5 2 400 0.15 0.3 0.996 8 0 5 0.8 400 0.1 0.3 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 2 0 0 2 2 0 0 0 3 0 0 2 2 0 0 0 8 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 2 0.2 0.5 0.35 0 0.7 0.7 3 0.2 0.5 0.35 0 0.7 0.7 8 0.1 0.5 0.25 0 0.7 0.25 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 2 0 0 0 0 3 1 0 3 0 0 0 0 3 1 0 8 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 *** 2210919-East Basin 7/29/2022 9:21:01 AM Page 27 # - # 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 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Existing East Basin*** PERLND 2 6.065 COPY 501 12 PERLND 2 6.065 COPY 501 13 PERLND 3 1.197 COPY 501 12 PERLND 3 1.197 COPY 501 13 PERLND 8 1.755 COPY 501 12 PERLND 8 1.755 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 2210919-East Basin 7/29/2022 9:21:01 AM Page 28 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 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 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*** 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 2210919-East Basin 7/29/2022 9:21:01 AM Page 29 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2011 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 2210919-East Basin.wdm MESSU 25 Mit2210919-East Basin.MES 27 Mit2210919-East Basin.L61 28 Mit2210919-East Basin.L62 31 POC2210919-East Basin2.dat 30 POC2210919-East Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 4 PERLND 2 PERLND 8 PERLND 3 IMPLND 2 IMPLND 4 IMPLND 6 IMPLND 9 GENER 2 RCHRES 1 RCHRES 2 RCHRES 3 COPY 502 COPY 1 COPY 501 COPY 601 DISPLY 2 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 2 Dev East Basin MAX 1 2 31 9 1 West Pond MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 502 1 1 501 1 1 601 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** 2 24 END OPCODE PARM # # K *** 2 0. END PARM END GENER 2210919-East Basin 7/29/2022 9:21:01 AM Page 30 PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 4 A/B, Pasture, Flat 1 1 1 1 27 0 2 A/B, Forest, Mod 1 1 1 1 27 0 8 A/B, Lawn, Mod 1 1 1 1 27 0 3 A/B, Forest, Steep 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 *** 4 0 0 1 0 0 0 0 0 0 0 0 0 2 0 0 1 0 0 0 0 0 0 0 0 0 8 0 0 1 0 0 0 0 0 0 0 0 0 3 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 ********* 4 0 0 4 0 0 0 0 0 0 0 0 0 1 9 2 0 0 4 0 0 0 0 0 0 0 0 0 1 9 8 0 0 4 0 0 0 0 0 0 0 0 0 1 9 3 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 4 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 8 0 0 0 0 0 0 0 0 0 0 0 3 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 4 0 5 1.5 400 0.05 0.3 0.996 2 0 5 2 400 0.1 0.3 0.996 8 0 5 0.8 400 0.1 0.3 0.996 3 0 5 2 400 0.15 0.3 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 4 0 0 2 2 0 0 0 2 0 0 2 2 0 0 0 8 0 0 2 2 0 0 0 3 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 4 0.15 0.5 0.3 0 0.7 0.4 2 0.2 0.5 0.35 0 0.7 0.7 8 0.1 0.5 0.25 0 0.7 0.25 3 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 4 0 0 0 0 3 1 0 2210919-East Basin 7/29/2022 9:21:01 AM Page 31 2 0 0 0 0 3 1 0 8 0 0 0 0 3 1 0 3 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 *** 2 ROADS/MOD 1 1 1 27 0 4 ROOF TOPS/FLAT 1 1 1 27 0 6 DRIVEWAYS/MOD 1 1 1 27 0 9 SIDEWALKS/MOD 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 2 0 0 1 0 0 0 4 0 0 1 0 0 0 6 0 0 1 0 0 0 9 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 2 0 0 4 0 0 0 1 9 4 0 0 4 0 0 0 1 9 6 0 0 4 0 0 0 1 9 9 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 *** 2 0 0 0 0 0 4 0 0 0 0 0 6 0 0 0 0 0 9 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 2 400 0.05 0.1 0.08 4 400 0.01 0.1 0.1 6 400 0.05 0.1 0.08 9 400 0.05 0.1 0.08 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 2 0 0 4 0 0 6 0 0 9 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 2 0 0 4 0 0 6 0 0 2210919-East Basin 7/29/2022 9:21:01 AM Page 32 9 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Dev East Basin*** PERLND 4 1.872 RCHRES 1 2 PERLND 4 1.872 RCHRES 1 3 PERLND 2 1.863 RCHRES 1 2 PERLND 2 1.863 RCHRES 1 3 PERLND 8 1.755 RCHRES 1 2 PERLND 8 1.755 RCHRES 1 3 PERLND 3 0.344 RCHRES 1 2 PERLND 3 0.344 RCHRES 1 3 IMPLND 2 0.654 RCHRES 1 5 IMPLND 4 0.235 RCHRES 1 5 IMPLND 6 0.287 RCHRES 1 5 IMPLND 9 0.244 RCHRES 1 5 East Bypass*** PERLND 4 0.663 COPY 501 12 PERLND 4 0.663 COPY 601 12 PERLND 4 0.663 COPY 501 13 PERLND 4 0.663 COPY 601 13 IMPLND 4 0.023 COPY 501 15 IMPLND 4 0.023 COPY 601 15 ******Routing****** RCHRES 2 1 RCHRES 3 7 RCHRES 2 COPY 1 17 RCHRES 1 1 RCHRES 3 7 RCHRES 1 COPY 1 17 RCHRES 1 1 RCHRES 2 8 RCHRES 3 1 COPY 501 17 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 502 OUTPUT MEAN 1 1 48.4 DISPLY 2 INPUT TIMSER 1 COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 GENER 2 OUTPUT TIMSER .0011111 RCHRES 1 EXTNL OUTDGT 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 Surface Bioreten-010 3 1 1 1 28 0 1 2 East Bioretentio-009 2 1 1 1 28 0 1 3 West Pond 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 2 1 0 0 0 0 0 0 0 0 0 3 1 0 0 0 0 0 0 0 0 0 END ACTIVITY 2210919-East Basin 7/29/2022 9:21:01 AM Page 33 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 2 4 0 0 0 0 0 0 0 0 0 1 9 3 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 6 0 0 0 1 0 0 0 2 1 2 2 2 2 0 1 0 0 4 5 0 0 0 0 0 0 0 0 2 2 2 2 2 3 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 0.0 0.0 2 2 0.02 0.0 0.0 0.0 0.0 3 3 0.02 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 6.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2 0 4.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3 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 *** User-Defined Variable Quantity Lines *** addr *** <------> *** kwd varnam optyp opn vari s1 s2 s3 tp multiply lc ls ac as agfn *** <****> <----> <----> <-> <----><-><-><-><-><--------> <><-> <><-> <--> *** UVQUAN vol2 RCHRES 2 VOL 4 UVQUAN v2m2 GLOBAL WORKSP 1 3 UVQUAN vpo2 GLOBAL WORKSP 2 3 UVQUAN v2d2 GENER 2 K 1 3 *** User-Defined Target Variable Names *** addr or addr or *** <------> <------> *** kwd varnam ct vari s1 s2 s3 frac oper vari s1 s2 s3 frac oper <****> <----><-> <----><-><-><-> <---> <--> <----><-><-><-> <---> <--> UVNAME v2m2 1 WORKSP 1 1.0 QUAN UVNAME vpo2 1 WORKSP 2 1.0 QUAN UVNAME v2d2 1 K 1 1.0 QUAN *** opt foplop dcdts yr mo dy hr mn d t vnam s1 s2 s3 ac quantity tc ts rp <****><-><--><><-><--> <> <> <> <><><> <----><-><-><-><-><--------> <> <-><-> GENER 2 v2m2 = 1562.49 *** Compute remaining available pore space GENER 2 vpo2 = v2m2 GENER 2 vpo2 -= vol2 *** Check to see if VPORA goes negative; if so set VPORA = 0.0 IF (vpo2 < 0.0) THEN GENER 2 vpo2 = 0.0 END IF *** Infiltration volume GENER 2 v2d2 = vpo2 END SPEC-ACTIONS FTABLES FTABLE 3 91 5 2210919-East Basin 7/29/2022 9:21:01 AM Page 34 Depth Area Volume Outflow1 Outflow2 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.082645 0.000000 0.000000 0.000000 0.033333 0.083242 0.002765 0.000000 0.335744 0.066667 0.083842 0.005550 0.000000 0.338163 0.100000 0.084444 0.008354 0.000000 0.340589 0.133333 0.085047 0.011179 0.000000 0.343022 0.166667 0.085652 0.014024 0.000000 0.345463 0.200000 0.086259 0.016889 0.000000 0.347911 0.233333 0.086868 0.019775 0.000000 0.350367 0.266667 0.087478 0.022681 0.000000 0.352830 0.300000 0.088091 0.025607 0.000000 0.355300 0.333333 0.088705 0.028553 0.000000 0.357778 0.366667 0.089321 0.031520 0.000000 0.360263 0.400000 0.089939 0.034508 0.000000 0.362756 0.433333 0.090559 0.037516 0.000000 0.365256 0.466667 0.091181 0.040545 0.000000 0.367763 0.500000 0.091804 0.043595 0.000000 0.370278 0.533333 0.092430 0.046666 0.000000 0.372800 0.566667 0.093057 0.049757 0.000000 0.375330 0.600000 0.093686 0.052870 0.000000 0.377867 0.633333 0.094317 0.056003 0.000000 0.380411 0.666667 0.094949 0.059157 0.000000 0.382963 0.700000 0.095584 0.062333 0.000000 0.385522 0.733333 0.096220 0.065530 0.000000 0.388089 0.766667 0.096859 0.068748 0.000000 0.390663 0.800000 0.097499 0.071987 0.000000 0.393244 0.833333 0.098140 0.075248 0.000000 0.395833 0.866667 0.098784 0.078530 0.000000 0.398430 0.900000 0.099430 0.081833 0.000000 0.401033 0.933333 0.100077 0.085158 0.000000 0.403644 0.966667 0.100726 0.088505 0.000000 0.406263 1.000000 0.101377 0.091873 0.000000 0.408889 1.033333 0.102030 0.095264 0.096853 0.411522 1.066667 0.102685 0.098675 0.273695 0.414163 1.100000 0.103342 0.102109 0.502178 0.416811 1.133333 0.104000 0.105565 0.771465 0.419467 1.166667 0.104660 0.109043 1.074270 0.422130 1.200000 0.105322 0.112542 1.404464 0.424800 1.233333 0.105986 0.116064 1.756250 0.427478 1.266667 0.106652 0.119608 2.123824 0.430163 1.300000 0.107320 0.123174 2.501261 0.432856 1.333333 0.107989 0.126763 2.882519 0.435556 1.366667 0.108660 0.130374 3.261505 0.438263 1.400000 0.109333 0.134007 3.632201 0.440978 1.433333 0.110008 0.137663 3.988826 0.443700 1.466667 0.110685 0.141341 4.326027 0.446430 1.500000 0.111364 0.145042 4.639092 0.449167 1.533333 0.112044 0.148765 4.924197 0.451911 1.566667 0.112726 0.152511 5.178660 0.454663 1.600000 0.113410 0.156280 5.401220 0.457422 1.633333 0.114096 0.160072 5.592337 0.460189 1.666667 0.114784 0.163887 5.754494 0.462963 1.700000 0.115474 0.167724 5.892534 0.465744 1.733333 0.116165 0.171585 6.013989 0.468533 1.766667 0.116859 0.175469 6.205051 0.471330 1.800000 0.117554 0.179375 6.338508 0.474133 1.833333 0.118251 0.183306 6.469213 0.476944 1.866667 0.118949 0.187259 6.597328 0.479763 1.900000 0.119650 0.191236 6.723003 0.482589 1.933333 0.120353 0.195236 6.846371 0.485422 1.966667 0.121057 0.199259 6.967555 0.488263 2.000000 0.121763 0.203306 7.086668 0.491111 2.033333 0.122471 0.207377 7.203811 0.493967 2.066667 0.123181 0.211471 7.319079 0.496830 2.100000 0.123893 0.215589 7.432560 0.499700 2.133333 0.124606 0.219730 7.544334 0.502578 2.166667 0.125321 0.223896 7.654476 0.505463 2.200000 0.126039 0.228085 7.763055 0.508356 2.233333 0.126758 0.232298 7.870137 0.511256 2210919-East Basin 7/29/2022 9:21:01 AM Page 35 2.266667 0.127478 0.236536 7.975781 0.514163 2.300000 0.128201 0.240797 8.080044 0.517078 2.333333 0.128926 0.245082 8.182979 0.520000 2.366667 0.129652 0.249392 8.284635 0.522930 2.400000 0.130380 0.253726 8.385058 0.525867 2.433333 0.131110 0.258084 8.484293 0.528811 2.466667 0.131842 0.262467 8.582381 0.531763 2.500000 0.132576 0.266874 8.679360 0.534722 2.533333 0.133311 0.271305 8.775267 0.537689 2.566667 0.134049 0.275761 8.870138 0.540663 2.600000 0.134788 0.280242 8.964004 0.543644 2.633333 0.135529 0.284747 9.056898 0.546633 2.666667 0.136272 0.289277 9.148849 0.549630 2.700000 0.137017 0.293832 9.239884 0.552633 2.733333 0.137763 0.298411 9.330031 0.555644 2.766667 0.138511 0.303016 9.419316 0.558663 2.800000 0.139262 0.307646 9.507762 0.561689 2.833333 0.140014 0.312300 9.595393 0.564722 2.866667 0.140768 0.316980 9.682231 0.567763 2.900000 0.141523 0.321685 9.768297 0.570811 2.933333 0.142281 0.326415 9.853611 0.573867 2.966667 0.143040 0.331170 9.938193 0.576930 3.000000 0.143802 0.335951 10.02206 0.580000 END FTABLE 3 FTABLE 2 56 5 Depth Area Volume Outflow1 Outflow2 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.060629 0.000000 0.000000 0.000000 0.027473 0.060271 0.000378 0.000000 0.000000 0.054945 0.059674 0.000763 0.000000 0.000000 0.082418 0.059079 0.001155 0.000000 0.000000 0.109890 0.058485 0.001553 0.000000 0.000000 0.137363 0.057892 0.001958 0.000000 0.000018 0.164835 0.057300 0.002370 0.000000 0.000453 0.192308 0.056710 0.002789 0.000000 0.000664 0.219780 0.056121 0.003214 0.000000 0.000930 0.247253 0.055533 0.003646 0.000000 0.001253 0.274725 0.054947 0.004085 0.000000 0.001641 0.302198 0.054362 0.004530 0.000000 0.002098 0.329670 0.053777 0.004983 0.000000 0.002629 0.357143 0.053195 0.005442 0.000000 0.003241 0.384615 0.052613 0.005909 0.000000 0.003938 0.412088 0.052033 0.006382 0.000000 0.004727 0.439560 0.051454 0.006862 0.000000 0.005613 0.467033 0.050876 0.007348 0.000000 0.006601 0.494505 0.050299 0.007842 0.000000 0.007699 0.521978 0.049724 0.008343 0.000000 0.008911 0.549451 0.049150 0.008851 0.000000 0.010244 0.576923 0.048577 0.009365 0.000000 0.011703 0.604396 0.048006 0.009887 0.000000 0.013296 0.631868 0.047435 0.010416 0.000000 0.015028 0.659341 0.046866 0.010951 0.000000 0.016906 0.686813 0.046298 0.011494 0.000000 0.018937 0.714286 0.045732 0.012044 0.000000 0.021126 0.741758 0.045167 0.012601 0.000000 0.023480 0.769231 0.044602 0.013165 0.000000 0.026007 0.796703 0.044040 0.013736 0.000000 0.028713 0.824176 0.043478 0.014314 0.000000 0.031604 0.851648 0.042918 0.014899 0.000000 0.034689 0.879121 0.042359 0.015491 0.000000 0.037973 0.906593 0.041801 0.016091 0.000000 0.041465 0.934066 0.041244 0.016697 0.000000 0.045170 0.961538 0.040689 0.017311 0.000000 0.049098 0.989011 0.040135 0.017932 0.000000 0.053254 1.016484 0.039582 0.018561 0.000000 0.057646 1.043956 0.039030 0.019196 0.000000 0.062283 1.071429 0.038480 0.019839 0.000000 0.067171 1.098901 0.037931 0.020489 0.000000 0.072318 1.126374 0.037383 0.021146 0.000000 0.077731 2210919-East Basin 7/29/2022 9:21:01 AM Page 36 1.153846 0.036836 0.021811 0.000000 0.083419 1.181319 0.036291 0.022483 0.000000 0.089389 1.208791 0.035747 0.023162 0.000000 0.095649 1.236264 0.035204 0.023849 0.000000 0.102206 1.263736 0.034662 0.024543 0.000000 0.109068 1.291209 0.034122 0.025244 0.000000 0.116242 1.318681 0.033583 0.025953 0.000000 0.123735 1.346154 0.033045 0.026669 0.000000 0.131554 1.373626 0.032508 0.027393 0.000000 0.139705 1.401099 0.031973 0.028124 0.000000 0.148190 1.428571 0.031439 0.028862 0.000000 0.157011 1.456044 0.030906 0.029608 0.000000 0.166156 1.483516 0.030374 0.030362 0.000000 0.175568 1.500000 0.029844 0.035870 0.000000 0.244537 END FTABLE 2 FTABLE 1 38 6 Depth Area Volume Outflow1 Outflow2 Outflow3 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.029844 0.000000 0.000000 0.000000 0.002414 0.027473 0.061228 0.001674 0.000000 0.090278 0.002414 0.054945 0.061827 0.003364 0.000000 0.093585 0.004833 0.082418 0.062428 0.005071 0.000000 0.095238 0.007257 0.109890 0.063031 0.006794 0.000000 0.096892 0.009686 0.137363 0.063634 0.008534 0.000000 0.098545 0.012120 0.164835 0.064239 0.010291 0.000000 0.100198 0.014559 0.192308 0.064845 0.012064 0.000000 0.101852 0.017004 0.219780 0.065452 0.013854 0.000000 0.103505 0.019453 0.247253 0.066061 0.015660 0.000000 0.105159 0.021907 0.274725 0.066670 0.017483 0.000000 0.106812 0.024366 0.302198 0.067281 0.019323 0.000000 0.108466 0.026831 0.329670 0.067893 0.021180 0.000000 0.110119 0.029300 0.357143 0.068507 0.023054 0.000000 0.111773 0.031774 0.384615 0.069122 0.024944 0.000000 0.113426 0.034254 0.412088 0.069738 0.026852 0.000000 0.115079 0.036738 0.439560 0.070355 0.028776 0.000000 0.116733 0.039228 0.467033 0.070973 0.030717 0.000000 0.118386 0.041722 0.494505 0.071593 0.032676 0.000000 0.120040 0.044222 0.521978 0.072214 0.034651 0.051870 0.120370 0.046726 0.549451 0.072836 0.036643 0.174930 0.120370 0.049236 0.576923 0.073460 0.038653 0.339117 0.120370 0.051750 0.604396 0.074084 0.040680 0.535530 0.120370 0.054270 0.631868 0.074710 0.042724 0.758877 0.120370 0.056795 0.659341 0.075338 0.044785 1.005166 0.120370 0.059325 0.686813 0.075966 0.046863 1.270936 0.120370 0.061859 0.714286 0.076596 0.048959 1.552922 0.120370 0.064399 0.741758 0.077227 0.051072 1.847893 0.120370 0.066944 0.769231 0.077859 0.053202 2.152583 0.120370 0.069494 0.796703 0.078492 0.055350 2.463663 0.120370 0.072049 0.824176 0.079127 0.057515 2.777747 0.120370 0.074609 0.851648 0.079763 0.059697 3.091423 0.120370 0.077173 0.879121 0.080400 0.061897 3.401294 0.120370 0.079743 0.906593 0.081039 0.064115 3.704036 0.120370 0.082318 0.934066 0.081678 0.066350 3.996465 0.120370 0.084898 0.961538 0.082319 0.068603 4.275612 0.120370 0.087484 0.989011 0.082961 0.070873 4.538807 0.120370 0.090074 1.000000 0.083219 0.071786 4.783770 0.120370 0.091111 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 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 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 WDM 2 PREC ENGL 1 RCHRES 1 EXTNL PREC 2210919-East Basin 7/29/2022 9:21:01 AM Page 37 WDM 1 EVAP ENGL 0.5 RCHRES 1 EXTNL POTEV WDM 1 EVAP ENGL 0.76 RCHRES 2 EXTNL POTEV 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 2 OUTPUT MEAN 1 1 48.4 WDM 702 FLOW ENGL REPL COPY 502 OUTPUT MEAN 1 1 48.4 WDM 802 FLOW ENGL REPL COPY 602 OUTPUT MEAN 1 1 48.4 WDM 902 FLOW ENGL REPL RCHRES 3 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 3 HYDR O 1 1 1 WDM 1002 FLOW ENGL REPL RCHRES 3 HYDR O 2 1 1 WDM 1003 FLOW ENGL REPL RCHRES 3 HYDR STAGE 1 1 1 WDM 1001 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 COPY 601 OUTPUT MEAN 1 1 48.4 WDM 901 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 7 RCHRES OFLOW OVOL 1 RCHRES INFLOW IVOL END MASS-LINK 7 MASS-LINK 8 RCHRES OFLOW OVOL 2 RCHRES INFLOW IVOL END MASS-LINK 8 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 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 2210919-East Basin 7/29/2022 9:21:01 AM Page 38 Predeveloped HSPF Message File 2210919-East Basin 7/29/2022 9:21:01 AM Page 39 Mitigated HSPF Message File 2210919-East Basin 7/29/2022 9:21:01 AM Page 40 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. 2005-2022; 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 B-5 2210919-South Basin 7/29/2022 8:50:31 AM Page 2 General Model Information Project Name:2210919-South Basin Site Name:Summit at Thompson Site Address:Berry Valley City:Yelm Report Date:7/29/2022 Gage:Eaton Creek Data Start:1955/10/01 Data End:2011/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2019/09/13 Version:4.2.17 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Low Flow Threshold for POC2:50 Percent of the 2 Year High Flow Threshold for POC2:50 Year 2210919-South Basin 7/29/2022 8:50:31 AM Page 3 Landuse Basin Data Predeveloped Land Use Existing South Basin Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 10.034 C, Lawn, Mod 2.449 Pervious Total 12.483 Impervious Land Use acre Impervious Total 0 Basin Total 12.483 Element Flows To: Surface Interflow Groundwater 2210919-South Basin 7/29/2022 8:50:31 AM Page 4 Mitigated Land Use Dev South Basin Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 0.479 C, Pasture, Flat 2.657 C, Lawn, Mod 2.448 Pervious Total 5.584 Impervious Land Use acre ROADS MOD 0.887 ROOF TOPS FLAT 1.458 DRIVEWAYS MOD 0.379 SIDEWALKS MOD 0.246 Impervious Total 2.97 Basin Total 8.554 Element Flows To: Surface Interflow Groundwater South Pond South Pond 2210919-South Basin 7/29/2022 8:50:31 AM Page 5 South Bypass Bypass:Yes GroundWater:No Pervious Land Use acre C, Pasture, Flat 1.234 C, Lawn, Mod 0.367 Pervious Total 1.601 Impervious Land Use acre Impervious Total 0 Basin Total 1.601 Element Flows To: Surface Interflow Groundwater 2210919-South Basin 7/29/2022 8:50:31 AM Page 6 Routing Elements Predeveloped Routing 2210919-South Basin 7/29/2022 8:50:31 AM Page 7 Mitigated Routing South Pond Bottom Length:175.00 ft. Bottom Width:80.00 ft. Depth:3.5 ft. Volume at riser head:1.1442 acre-feet. Side slope 1:3 To 1 Side slope 2:3 To 1 Side slope 3:3 To 1 Side slope 4:3 To 1 Discharge Structure Riser Height:3 ft. Riser Diameter:18 in. Notch Type:Rectangular Notch Width:0.250 ft. Notch Height:0.500 ft. Orifice 1 Diameter:3.25 in.Elevation:0 ft. Element Flows To: Outlet 1 Outlet 2 Pond Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.321 0.000 0.000 0.000 0.0389 0.322 0.012 0.056 0.000 0.0778 0.324 0.025 0.079 0.000 0.1167 0.325 0.037 0.097 0.000 0.1556 0.326 0.050 0.113 0.000 0.1944 0.328 0.063 0.126 0.000 0.2333 0.329 0.076 0.138 0.000 0.2722 0.331 0.088 0.149 0.000 0.3111 0.332 0.101 0.159 0.000 0.3500 0.333 0.114 0.169 0.000 0.3889 0.335 0.127 0.178 0.000 0.4278 0.336 0.140 0.187 0.000 0.4667 0.338 0.153 0.195 0.000 0.5056 0.339 0.167 0.203 0.000 0.5444 0.340 0.180 0.211 0.000 0.5833 0.342 0.193 0.218 0.000 0.6222 0.343 0.206 0.226 0.000 0.6611 0.345 0.220 0.233 0.000 0.7000 0.346 0.233 0.239 0.000 0.7389 0.347 0.247 0.246 0.000 0.7778 0.349 0.260 0.252 0.000 0.8167 0.350 0.274 0.259 0.000 0.8556 0.352 0.288 0.265 0.000 0.8944 0.353 0.301 0.271 0.000 0.9333 0.354 0.315 0.276 0.000 0.9722 0.356 0.329 0.282 0.000 1.0111 0.357 0.343 0.288 0.000 1.0500 0.359 0.357 0.293 0.000 1.0889 0.360 0.371 0.299 0.000 1.1278 0.362 0.385 0.304 0.000 1.1667 0.363 0.399 0.309 0.000 1.2056 0.364 0.413 0.314 0.000 2210919-South Basin 7/29/2022 8:50:31 AM Page 8 1.2444 0.366 0.427 0.319 0.000 1.2833 0.367 0.442 0.324 0.000 1.3222 0.369 0.456 0.329 0.000 1.3611 0.370 0.470 0.334 0.000 1.4000 0.372 0.485 0.339 0.000 1.4389 0.373 0.499 0.343 0.000 1.4778 0.375 0.514 0.348 0.000 1.5167 0.376 0.528 0.353 0.000 1.5556 0.378 0.543 0.357 0.000 1.5944 0.379 0.558 0.361 0.000 1.6333 0.381 0.573 0.366 0.000 1.6722 0.382 0.587 0.370 0.000 1.7111 0.383 0.602 0.374 0.000 1.7500 0.385 0.617 0.379 0.000 1.7889 0.386 0.632 0.383 0.000 1.8278 0.388 0.647 0.387 0.000 1.8667 0.389 0.662 0.391 0.000 1.9056 0.391 0.678 0.395 0.000 1.9444 0.392 0.693 0.399 0.000 1.9833 0.394 0.708 0.403 0.000 2.0222 0.395 0.724 0.407 0.000 2.0611 0.397 0.739 0.411 0.000 2.1000 0.398 0.754 0.415 0.000 2.1389 0.400 0.770 0.419 0.000 2.1778 0.401 0.786 0.423 0.000 2.2167 0.403 0.801 0.426 0.000 2.2556 0.404 0.817 0.430 0.000 2.2944 0.406 0.833 0.434 0.000 2.3333 0.407 0.849 0.437 0.000 2.3722 0.409 0.864 0.441 0.000 2.4111 0.410 0.880 0.445 0.000 2.4500 0.412 0.896 0.448 0.000 2.4889 0.413 0.913 0.452 0.000 2.5278 0.415 0.929 0.459 0.000 2.5667 0.417 0.945 0.473 0.000 2.6056 0.418 0.961 0.491 0.000 2.6444 0.420 0.977 0.511 0.000 2.6833 0.421 0.994 0.534 0.000 2.7222 0.423 1.010 0.560 0.000 2.7611 0.424 1.027 0.587 0.000 2.8000 0.426 1.043 0.616 0.000 2.8389 0.427 1.060 0.647 0.000 2.8778 0.429 1.076 0.679 0.000 2.9167 0.430 1.093 0.713 0.000 2.9556 0.432 1.110 0.748 0.000 2.9944 0.434 1.127 0.785 0.000 3.0333 0.435 1.144 0.890 0.000 3.0722 0.437 1.161 1.105 0.000 3.1111 0.438 1.178 1.387 0.000 3.1500 0.440 1.195 1.722 0.000 3.1889 0.441 1.212 2.097 0.000 3.2278 0.443 1.229 2.505 0.000 3.2667 0.445 1.246 2.936 0.000 3.3056 0.446 1.264 3.380 0.000 3.3444 0.448 1.281 3.827 0.000 3.3833 0.449 1.299 4.269 0.000 3.4222 0.451 1.316 4.696 0.000 3.4611 0.452 1.334 5.099 0.000 2210919-South Basin 7/29/2022 8:50:31 AM Page 9 3.5000 0.454 1.351 5.469 0.000 3.5389 0.456 1.369 5.802 0.000 2210919-South Basin 7/29/2022 8:50:31 AM Page 10 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:12.483 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:7.185 Total Impervious Area:2.97 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.75514 5 year 1.282374 10 year 1.741205 25 year 2.46802 50 year 3.131278 100 year 3.912487 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.462081 5 year 0.627197 10 year 0.745754 25 year 0.906376 50 year 1.034089 100 year 1.168875 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1956 0.774 0.464 1957 1.725 0.684 1958 0.779 0.282 1959 0.750 0.428 1960 0.910 0.603 1961 0.740 0.427 1962 0.497 0.262 1963 2.141 0.645 1964 0.560 0.438 1965 0.888 0.410 2210919-South Basin 7/29/2022 8:50:52 AM Page 11 1966 0.381 0.300 1967 0.917 0.460 1968 0.533 0.370 1969 0.332 0.306 1970 0.510 0.403 1971 0.816 0.492 1972 1.928 0.654 1973 0.599 0.436 1974 0.845 0.339 1975 0.659 0.320 1976 0.974 0.538 1977 0.524 0.251 1978 0.984 0.425 1979 0.520 0.394 1980 0.704 0.449 1981 2.650 0.728 1982 1.144 0.559 1983 1.200 0.575 1984 1.143 0.430 1985 0.327 0.284 1986 1.140 0.620 1987 1.061 0.639 1988 0.419 0.386 1989 1.818 0.604 1990 0.837 0.536 1991 6.240 0.923 1992 1.550 0.545 1993 1.314 0.569 1994 0.340 0.291 1995 0.876 0.556 1996 1.243 1.489 1997 0.563 0.431 1998 1.710 0.606 1999 0.873 0.507 2000 0.480 0.397 2001 0.511 0.472 2002 0.288 0.287 2003 0.536 0.570 2004 1.089 0.822 2005 0.431 0.386 2006 0.579 0.431 2007 1.018 0.718 2008 0.529 0.483 2009 0.976 0.853 2010 0.316 0.384 2011 0.391 0.340 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 6.2399 1.4892 2 2.6501 0.9228 3 2.1415 0.8534 4 1.9281 0.8224 5 1.8178 0.7282 6 1.7254 0.7185 7 1.7105 0.6839 8 1.5500 0.6543 2210919-South Basin 7/29/2022 8:50:52 AM Page 12 9 1.3144 0.6454 10 1.2435 0.6391 11 1.1999 0.6200 12 1.1439 0.6060 13 1.1431 0.6039 14 1.1398 0.6028 15 1.0893 0.5751 16 1.0610 0.5703 17 1.0179 0.5686 18 0.9843 0.5589 19 0.9762 0.5560 20 0.9743 0.5452 21 0.9171 0.5383 22 0.9103 0.5356 23 0.8877 0.5073 24 0.8761 0.4918 25 0.8728 0.4832 26 0.8446 0.4717 27 0.8371 0.4641 28 0.8157 0.4600 29 0.7790 0.4494 30 0.7739 0.4383 31 0.7496 0.4362 32 0.7405 0.4313 33 0.7037 0.4309 34 0.6587 0.4305 35 0.5993 0.4280 36 0.5787 0.4267 37 0.5626 0.4246 38 0.5603 0.4102 39 0.5362 0.4025 40 0.5326 0.3968 41 0.5288 0.3935 42 0.5239 0.3856 43 0.5203 0.3855 44 0.5108 0.3838 45 0.5098 0.3700 46 0.4967 0.3400 47 0.4799 0.3393 48 0.4309 0.3205 49 0.4192 0.3061 50 0.3914 0.2998 51 0.3809 0.2909 52 0.3398 0.2865 53 0.3316 0.2836 54 0.3274 0.2823 55 0.3155 0.2617 56 0.2883 0.2514 2210919-South Basin 7/29/2022 8:50:52 AM Page 13 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.3776 8809 8726 99 Pass 0.4054 7047 6289 89 Pass 0.4332 5763 4179 72 Pass 0.4610 4687 2924 62 Pass 0.4888 3843 1997 51 Pass 0.5166 3177 1305 41 Pass 0.5445 2529 800 31 Pass 0.5723 2032 527 25 Pass 0.6001 1702 391 22 Pass 0.6279 1410 314 22 Pass 0.6557 1150 267 23 Pass 0.6835 962 228 23 Pass 0.7114 774 185 23 Pass 0.7392 642 153 23 Pass 0.7670 524 132 25 Pass 0.7948 437 112 25 Pass 0.8226 367 87 23 Pass 0.8504 311 69 22 Pass 0.8782 264 55 20 Pass 0.9061 208 43 20 Pass 0.9339 178 32 17 Pass 0.9617 154 29 18 Pass 0.9895 127 27 21 Pass 1.0173 112 25 22 Pass 1.0451 98 23 23 Pass 1.0730 87 22 25 Pass 1.1008 71 21 29 Pass 1.1286 61 20 32 Pass 1.1564 50 19 38 Pass 1.1842 40 19 47 Pass 1.2120 22 18 81 Pass 1.2398 18 16 88 Pass 1.2677 16 15 93 Pass 1.2955 15 14 93 Pass 1.3233 14 11 78 Pass 1.3511 14 9 64 Pass 1.3789 14 8 57 Pass 1.4067 14 6 42 Pass 1.4345 14 5 35 Pass 1.4624 13 3 23 Pass 1.4902 13 0 0 Pass 1.5180 13 0 0 Pass 1.5458 13 0 0 Pass 1.5736 12 0 0 Pass 1.6014 10 0 0 Pass 1.6293 10 0 0 Pass 1.6571 10 0 0 Pass 1.6849 9 0 0 Pass 1.7127 8 0 0 Pass 1.7405 7 0 0 Pass 1.7683 6 0 0 Pass 1.7961 6 0 0 Pass 1.8240 5 0 0 Pass 2210919-South Basin 7/29/2022 8:50:52 AM Page 14 1.8518 5 0 0 Pass 1.8796 5 0 0 Pass 1.9074 5 0 0 Pass 1.9352 4 0 0 Pass 1.9630 4 0 0 Pass 1.9909 4 0 0 Pass 2.0187 4 0 0 Pass 2.0465 4 0 0 Pass 2.0743 4 0 0 Pass 2.1021 4 0 0 Pass 2.1299 4 0 0 Pass 2.1577 3 0 0 Pass 2.1856 3 0 0 Pass 2.2134 3 0 0 Pass 2.2412 3 0 0 Pass 2.2690 3 0 0 Pass 2.2968 3 0 0 Pass 2.3246 3 0 0 Pass 2.3525 3 0 0 Pass 2.3803 3 0 0 Pass 2.4081 3 0 0 Pass 2.4359 3 0 0 Pass 2.4637 3 0 0 Pass 2.4915 2 0 0 Pass 2.5193 2 0 0 Pass 2.5472 2 0 0 Pass 2.5750 2 0 0 Pass 2.6028 2 0 0 Pass 2.6306 2 0 0 Pass 2.6584 1 0 0 Pass 2.6862 1 0 0 Pass 2.7140 1 0 0 Pass 2.7419 1 0 0 Pass 2.7697 1 0 0 Pass 2.7975 1 0 0 Pass 2.8253 1 0 0 Pass 2.8531 1 0 0 Pass 2.8809 1 0 0 Pass 2.9088 1 0 0 Pass 2.9366 1 0 0 Pass 2.9644 1 0 0 Pass 2.9922 1 0 0 Pass 3.0200 1 0 0 Pass 3.0478 1 0 0 Pass 3.0756 1 0 0 Pass 3.1035 1 0 0 Pass 3.1313 1 0 0 Pass 2210919-South Basin 7/29/2022 8:50:52 AM Page 15 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. 2210919-South Basin 7/29/2022 8:50:52 AM Page 16 LID Report 2210919-South Basin 7/29/2022 8:50:58 AM Page 17 POC 2 POC #2 was not reported because POC must exist in both scenarios and both scenarios must have been run. 2210919-South Basin 7/29/2022 8:50:58 AM Page 18 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. 2210919-South Basin 7/29/2022 8:50:58 AM Page 19 Appendix Predeveloped Schematic 2210919-South Basin 7/29/2022 8:50:59 AM Page 20 Mitigated Schematic 2210919-South Basin 7/29/2022 8:50:59 AM Page 21 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2011 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 2210919-South Basin.wdm MESSU 25 Pre2210919-South Basin.MES 27 Pre2210919-South Basin.L61 28 Pre2210919-South Basin.L62 30 POC2210919-South Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 PERLND 17 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Existing South Basin 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 *** 11 C, Forest, Mod 1 1 1 1 27 0 17 C, Lawn, Mod 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 *** 11 0 0 1 0 0 0 0 0 0 0 0 0 17 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 ********* 2210919-South Basin 7/29/2022 8:50:59 AM Page 22 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 17 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 17 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 11 0 4.5 0.08 400 0.1 0.5 0.996 17 0 4.5 0.03 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 17 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 17 0.1 0.25 0.25 6 0.5 0.25 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 11 0 0 0 0 2.5 1 0 17 0 0 0 0 2.5 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 2210919-South Basin 7/29/2022 8:50:59 AM Page 23 <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 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Existing South Basin*** PERLND 11 10.034 COPY 501 12 PERLND 11 10.034 COPY 501 13 PERLND 17 2.449 COPY 501 12 PERLND 17 2.449 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 2210919-South Basin 7/29/2022 8:50:59 AM Page 24 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 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 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*** 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 2210919-South Basin 7/29/2022 8:50:59 AM Page 25 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1955 10 01 END 2011 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 2210919-South Basin.wdm MESSU 25 Mit2210919-South Basin.MES 27 Mit2210919-South Basin.L61 28 Mit2210919-South Basin.L62 31 POC2210919-South Basin2.dat 30 POC2210919-South Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 PERLND 13 PERLND 17 IMPLND 2 IMPLND 4 IMPLND 6 IMPLND 9 RCHRES 1 COPY 502 COPY 1 COPY 501 COPY 601 DISPLY 2 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 2 Dev South Basin MAX 1 2 31 9 1 South Pond MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 502 1 1 501 1 1 601 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 *** 11 C, Forest, Mod 1 1 1 1 27 0 2210919-South Basin 7/29/2022 8:50:59 AM Page 26 13 C, Pasture, Flat 1 1 1 1 27 0 17 C, Lawn, Mod 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 *** 11 0 0 1 0 0 0 0 0 0 0 0 0 13 0 0 1 0 0 0 0 0 0 0 0 0 17 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 ********* 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 13 0 0 4 0 0 0 0 0 0 0 0 0 1 9 17 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 13 0 0 0 0 0 0 0 0 0 0 0 17 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 11 0 4.5 0.08 400 0.1 0.5 0.996 13 0 4.5 0.06 400 0.05 0.5 0.996 17 0 4.5 0.03 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 13 0 0 2 2 0 0 0 17 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 13 0.15 0.4 0.3 6 0.5 0.4 17 0.1 0.25 0.25 6 0.5 0.25 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 11 0 0 0 0 2.5 1 0 13 0 0 0 0 2.5 1 0 17 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 2 ROADS/MOD 1 1 1 27 0 4 ROOF TOPS/FLAT 1 1 1 27 0 2210919-South Basin 7/29/2022 8:50:59 AM Page 27 6 DRIVEWAYS/MOD 1 1 1 27 0 9 SIDEWALKS/MOD 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 2 0 0 1 0 0 0 4 0 0 1 0 0 0 6 0 0 1 0 0 0 9 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 2 0 0 4 0 0 0 1 9 4 0 0 4 0 0 0 1 9 6 0 0 4 0 0 0 1 9 9 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 *** 2 0 0 0 0 0 4 0 0 0 0 0 6 0 0 0 0 0 9 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 2 400 0.05 0.1 0.08 4 400 0.01 0.1 0.1 6 400 0.05 0.1 0.08 9 400 0.05 0.1 0.08 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 2 0 0 4 0 0 6 0 0 9 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 2 0 0 4 0 0 6 0 0 9 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Dev South Basin*** PERLND 11 0.479 RCHRES 1 2 PERLND 11 0.479 RCHRES 1 3 PERLND 13 2.657 RCHRES 1 2 PERLND 13 2.657 RCHRES 1 3 PERLND 17 2.448 RCHRES 1 2 2210919-South Basin 7/29/2022 8:50:59 AM Page 28 PERLND 17 2.448 RCHRES 1 3 IMPLND 2 0.887 RCHRES 1 5 IMPLND 4 1.458 RCHRES 1 5 IMPLND 6 0.379 RCHRES 1 5 IMPLND 9 0.246 RCHRES 1 5 Dev South Basin*** PERLND 11 0.479 COPY 502 12 PERLND 11 0.479 COPY 502 13 PERLND 13 2.657 COPY 502 12 PERLND 13 2.657 COPY 502 13 PERLND 17 2.448 COPY 502 12 PERLND 17 2.448 COPY 502 13 IMPLND 2 0.887 COPY 502 15 IMPLND 4 1.458 COPY 502 15 IMPLND 6 0.379 COPY 502 15 IMPLND 9 0.246 COPY 502 15 South Bypass*** PERLND 13 1.234 COPY 501 12 PERLND 13 1.234 COPY 601 12 PERLND 13 1.234 COPY 501 13 PERLND 13 1.234 COPY 601 13 PERLND 17 0.367 COPY 501 12 PERLND 17 0.367 COPY 601 12 PERLND 17 0.367 COPY 501 13 PERLND 17 0.367 COPY 601 13 ******Routing****** PERLND 11 0.479 COPY 1 12 PERLND 13 2.657 COPY 1 12 PERLND 17 2.448 COPY 1 12 IMPLND 2 0.887 COPY 1 15 IMPLND 4 1.458 COPY 1 15 IMPLND 6 0.379 COPY 1 15 IMPLND 9 0.246 COPY 1 15 PERLND 11 0.479 COPY 1 13 PERLND 13 2.657 COPY 1 13 PERLND 17 2.448 COPY 1 13 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 502 OUTPUT MEAN 1 1 48.4 DISPLY 2 INPUT TIMSER 1 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 South Pond 1 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 ********* 2210919-South Basin 7/29/2022 8:50:59 AM Page 29 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 0 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 0.03 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 0.0 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 FTABLES FTABLE 1 91 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.321396 0.000000 0.000000 0.038889 0.322763 0.012525 0.056525 0.077778 0.324133 0.025104 0.079938 0.116667 0.325505 0.037736 0.097904 0.155556 0.326880 0.050421 0.113049 0.194444 0.328257 0.063160 0.126393 0.233333 0.329636 0.075952 0.138457 0.272222 0.331019 0.088798 0.149550 0.311111 0.332403 0.101698 0.159876 0.350000 0.333790 0.114652 0.169574 0.388889 0.335180 0.127660 0.178747 0.427778 0.336572 0.140721 0.187471 0.466667 0.337967 0.153837 0.195807 0.505556 0.339364 0.167008 0.203803 0.544444 0.340764 0.180232 0.211496 0.583333 0.342166 0.193512 0.218919 0.622222 0.343571 0.206845 0.226099 0.661111 0.344978 0.220234 0.233057 0.700000 0.346388 0.233677 0.239814 0.738889 0.347800 0.247175 0.246385 0.777778 0.349214 0.260728 0.252786 0.816667 0.350632 0.274336 0.259029 0.855556 0.352051 0.288000 0.265124 0.894444 0.353473 0.301718 0.271083 0.933333 0.354898 0.315492 0.276913 0.972222 0.356325 0.329321 0.282623 1.011111 0.357755 0.343206 0.288221 1.050000 0.359187 0.357147 0.293711 1.088889 0.360622 0.371143 0.299101 1.127778 0.362059 0.385195 0.304395 1.166667 0.363499 0.399303 0.309598 1.205556 0.364941 0.413467 0.314716 1.244444 0.366385 0.427688 0.319752 1.283333 0.367833 0.441964 0.324710 1.322222 0.369282 0.456297 0.329593 1.361111 0.370734 0.470686 0.334405 1.400000 0.372189 0.485132 0.339148 1.438889 0.373646 0.499634 0.343826 2210919-South Basin 7/29/2022 8:50:59 AM Page 30 1.477778 0.375106 0.514193 0.348442 1.516667 0.376568 0.528809 0.352997 1.555556 0.378033 0.543482 0.357494 1.594444 0.379500 0.558212 0.361935 1.633333 0.380970 0.572999 0.366322 1.672222 0.382442 0.587843 0.370657 1.711111 0.383917 0.602744 0.374942 1.750000 0.385394 0.617703 0.379179 1.788889 0.386873 0.632719 0.383369 1.827778 0.388356 0.647793 0.387514 1.866667 0.389840 0.662925 0.391615 1.905556 0.391327 0.678114 0.395673 1.944444 0.392817 0.693361 0.399690 1.983333 0.394309 0.708667 0.403667 2.022222 0.395804 0.724030 0.407605 2.061111 0.397301 0.739451 0.411506 2.100000 0.398801 0.754931 0.415370 2.138889 0.400303 0.770469 0.419198 2.177778 0.401808 0.786066 0.422992 2.216667 0.403315 0.801721 0.426752 2.255556 0.404824 0.817435 0.430479 2.294444 0.406337 0.833207 0.434174 2.333333 0.407851 0.849039 0.437838 2.372222 0.409368 0.864929 0.441472 2.411111 0.410888 0.880879 0.445076 2.450000 0.412410 0.896887 0.448651 2.488889 0.413935 0.912955 0.452198 2.527778 0.415462 0.929082 0.459571 2.566667 0.416992 0.945269 0.473539 2.605556 0.418524 0.961515 0.491225 2.644444 0.420059 0.977821 0.511817 2.683333 0.421596 0.994186 0.534879 2.722222 0.423135 1.010612 0.560129 2.761111 0.424678 1.027097 0.587362 2.800000 0.426222 1.043642 0.616422 2.838889 0.427769 1.060247 0.647184 2.877778 0.429319 1.076913 0.679547 2.916667 0.430871 1.093639 0.713425 2.955556 0.432426 1.110425 0.748745 2.994444 0.433983 1.127272 0.785443 3.033333 0.435543 1.144180 0.890398 3.072222 0.437105 1.161148 1.105294 3.111111 0.438670 1.178177 1.387711 3.150000 0.440237 1.195267 1.722130 3.188889 0.441806 1.212417 2.097902 3.227778 0.443379 1.229629 2.505662 3.266667 0.444953 1.246902 2.936214 3.305556 0.446530 1.264237 3.380169 3.344444 0.448110 1.281633 3.827922 3.383333 0.449692 1.299090 4.269819 3.422222 0.451277 1.316609 4.696438 3.461111 0.452864 1.334189 5.098971 3.500000 0.454454 1.351832 5.469665 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 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 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*** COPY 2 OUTPUT MEAN 1 1 48.4 WDM 702 FLOW ENGL REPL 2210919-South Basin 7/29/2022 8:50:59 AM Page 31 COPY 502 OUTPUT MEAN 1 1 48.4 WDM 802 FLOW ENGL REPL COPY 602 OUTPUT MEAN 1 1 48.4 WDM 902 FLOW ENGL REPL RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 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 COPY 601 OUTPUT MEAN 1 1 48.4 WDM 901 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 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 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN 2210919-South Basin 7/29/2022 8:50:59 AM Page 32 Predeveloped HSPF Message File 2210919-South Basin 7/29/2022 8:50:59 AM Page 33 Mitigated HSPF Message File 2210919-South Basin 7/29/2022 8:50:59 AM Page 34 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 Preliminary Stormwater Report The Summit at Thompson Creek 2210919.10 Appendix C Geotechnical Engineering Report South Sound Geotechnical Consulting, Inc. dated June 16, 2022 South Sound Geotechnical Consulting P.O. Box 39500, Lakewood, WA 98496 (253) 973-0515 June 16, 2022 Mr. Matt Weber c/o AHBL 2215 North 30th Street, Suite 200 Tacoma, Washington 98403-3350 Subject: Geotechnical Engineering Report The Summit at Thompson Creek 14444 Berry Valley Road Yelm, Washington SSGC Project No. 22029 Mr. Weber, South Sound Geotechnical Consulting (SSGC) has completed a geotechnical assessment for the planned development at the above addressed property in Yelm, Washington. Our services have been completed in general conformance with our proposal P21150 (dated March 31, 2022) and authorized per signature of our agreement for services. Our scope of services included completion of twenty test pits and one infiltration test on the site, laboratory testing, engineering analyses, and preparation of this report. PROJECT INFORMATION The site is composed of several individual parcels totaling about 30 acres, west of the current terminus of Berry Valley Road. Development plans include dividing the properties into 93 individual single-family lots. SITE CONDITIONS The eastern portion of the site is lower in elevation and generally level. This area is grass field. The western portion is characterized by a southwest-northeast trending knoll. An existing residence and several outbuildings are in the eastern side of the western portion. The remainder of the western portion is undeveloped and partially forested. Overall elevation change across the site is on the order of 70 (+/-) feet from the highest point on the knoll in the western portion to the lower eastern portion of the site. Elevation change in the western portion is on the order of 50 feet (+/-). SUBSURFACE CONDITIONS Subsurface conditions were characterized by completing twenty test pits and one infiltration test on April 14, 2022. Explorations were advanced to final depths between 2.5 and 11 feet below existing ground surface. Approximate locations of the explorations are shown on Figure 1, Exploration Plan. A summary description of observed subgrade conditions is provided below. Logs of the test holes are provided in Appendix A. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 2 Soil Conditions Topsoil and isolated fill was at the surface of the test pits and extended to depths between 6 inches and 2.5 feet. Native soils below the topsoil/fill varied across the site. In general, the lower eastern portion contains loose sandy gravel with cobbles, occasional boulders and minor fines. These soils are considered to be outwash deposits and extended to the termination depth of the test holes in this area. Native soils in the western portion consisted of upper layers of soft to stiff clayey silt (interpreted as glacial lake deposits) or outwash over glacial till/drift consisting of silty sand with gravel and variable cobbles. Upper soils extended to depths from less than 1 foot to about 5 feet. Till/drift was in a medium dense grading to very dense condition and extended to the termination depth of the test pits, where encountered. Groundwater Conditions Groundwater was observed in test pit TP-17 (adjacent infiltration test PIT-1 in the lower eastern portion) near Thompson Creek at an elevation of about 7 feet at the time of excavation. Seepage was observed in several of the test pits in the western portion above the glacial till/drift. Groundwater levels and seepage will vary throughout the year due to seasonal precipitation and on- and off-site drainage patterns. Geologic Setting Soil types mapped on the site per the USDA Soil Conservation Service map of Thurston County consist of both glacial outwash and glacial drift. Outwash soils are generally mapped in the lower eastern portion of the site, with drift in the higher western portion. Native soils appear to generally conform to the mapped soil types. GEOTECHNICAL DESIGN CONSIDERATIONS The planned development is considered feasible based on observed soil conditions in the test pits. Properly prepared native soils are considered suitable for support of conventional spread footing foundations, slab- on-grade floors, and conventional pavements. Native (outwash) soils are suitable for infiltration, where encountered. Soils with higher fines content and drift/till are predominant in the higher elevated western portion. These soils will limit infiltration facilities to shallow dispersion or detention systems. Infiltration is not feasible in the silty (lake deposits) or dense drift/till soils. Depth to seasonally high groundwater levels should be considered in the design of infiltration facilities in the lower eastern portion. We anticipate grading (cuts and fills) will be used to modify existing topography for final design grades of the development, particularly in the western portion. Final grades should be considered relative to the feasibility of infiltration systems. Recommendations presented in the following sections should be considered general and may require modifications when earthwork and grading occur. They are based upon the subsurface conditions observed Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 3 in the test pits and the assumption that finish site grades will be similar to existing grades. It should be noted that subsurface conditions across the site may vary from those depicted on the exploration logs and can change with time. Therefore, proper site preparation will depend upon the weather and soil conditions encountered at the time of construction. We recommend SSGC review final plans and assess subgrade conditions at the time of construction. General Site Preparation Site grading and earthwork should include procedures to control surface water runoff. Grading the site without adequate drainage control measures may negatively impact site soils, resulting in increased export of impacted soil and import of fill materials, thereby potentially increasing the cost of the earthwork and subgrade preparation phases of the project. Site grading should include removal of all fill and any organic materials in future building and pavement areas. Subgrades should consist of firm native soils following stripping. Final stripping depths can only be determined at the time of earthwork. General Subgrade Preparation Subgrades in building and pavement areas should consist of firm native soil or compacted structural fill. We recommend exposed subgrades in building and conventional pavement areas are proofrolled using a large roller, loaded dump truck, or other mechanical equipment to assess subgrade conditions following stripping. Proofrolling efforts should result in the upper 1 foot of subgrade soils achievin g a firm and unyielding condition and a compaction level of at least 92 percent of the maximum dry density (MDD) per the ASTM D1557 test method. Wet, loose, or soft subgrades that cannot achieve this compaction level should be removed (over-excavated) and replaced with structural fill. The depth of over-excavation should be based on soil conditions at the time of construction. A representative of SSGC should be present to assess subgrade conditions during proofrolling. Grading and Drainage Positive drainage should be provided during construction and maintained throughout the life of the development. Surface water should not be allowed into cut/fill areas, utility trenches, building footprints, or pavement areas. Structural Fill Materials The suitability of soil for use as structural fill will depend on the gradation and moisture content of the soil when it is placed. Soils with higher fines content (soil fraction passing the U.S. No. 200 sieve) will become sensitive with higher moisture content. It is often difficult to achieve adequate compaction if soil moisture is outside of optimum ranges for soils that contain more than about 5 percent fines. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 4 Site Soils: Topsoil is not considered suitable for structural fill and should be wasted from the site or used in landscape areas. The clayey silt and glacial till/drift will be difficult to use due to higher fines content of these soils. Native outwash soil is generally considered suitable for use as structural. Soils with higher fines content could be used provided they can be moisture conditioned to within optimal ranges. Silt content will vary in the native soils and can make them moisture sensitive, requiring conditioning (drying or wetting) to obtain optimum moisture content. Optimum moisture is considered within about +/- 2 percent of the moisture content required to achieve the maximum density per the ASTM D-1557 test method. Import Fill Materials: We recommend imported structural fill placed during dry weather consist of material which meets the specifications for Gravel Borrow as described in Section 9-03.14(1) of the Washington State Department of Transportation (WSDOT) Specifications for Road, Bridge, and Municipal Construction manual (Publication M41-10). Gravel Borrow should be protected from disturbance if exposed to wet conditions after placement. During wet weather, or for backfill on wet subgrades, import soil suitable for compaction in wetter conditions should be provided. Imported fill for use in wet conditions should conform to specifications for Select Borrow as described in Section 9-03.14(2), or Crushed Surfacing per Section 9-03.9(3) of the WSDOT M41-10 manual, with the modification that a maximum of 5 percent by weight shall pass the U.S. No. 200 sieve for these soil types. Structural fill placement and compaction is weather-dependent. Delays due to inclement weather are common, even when using select granular fill. We recommend site grading and earthwork be scheduled for the drier months of the year. Structural fill should not consist of frozen material. Structural Fill Placement We recommend structural fill is placed in lifts not exceeding about 10 inches in loose measure. It may be necessary to adjust lift thickness based on site and fill conditions, and type of compaction equipment used during placement and compaction. Finer grained soil used as structural fill and/or lighter weight compaction equipment may require significantly thinner lifts to attain required compaction levels. Coarser granular soil with lower fines contents could potentially be placed in thicker lifts (1 foot maximum) if they can be adequately compacted. Structural fill should be compacted to attain the recommended levels presented in Table 1, Compaction Criteria. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 5 Table 1. Compaction Criteria Fill Application Compaction Criteria* Footing areas (below structures and retaining walls) 95 % Upper 2 feet in pavement areas, slabs and sidewalks, and utility trenches 95 % Below 2 feet in pavement areas, slabs and sidewalks, and utility trenches 92 % Utility trenches or general fill in non-paved or -building areas 90 % *Per the ASTM D 1557 test method. Trench backfill within about 2 feet of utility lines should not be over-compacted to reduce the risk of damage to the line. In some instances the top of the utility line may be within 2 feet of the surface. Backfill in these circumstances should be compacted to a firm and unyielding condition. We recommend fill procedures include maintaining grades that promote drainage and do not allow ponding of water within the fill area. The contractor should protect compacted fill subgrades from disturbance during wet weather. In the event of rain during structural fill placement, the exposed fill surface should be allowed to dry prior to placement of additional fill. Alternatively, the we t soil can be removed. We recommend consideration be given to protecting haul routes and other high traffic areas with free-draining granular fill material (i.e. sand and gravel containing less than 5 percent fines) or quarry spalls to reduce the potential for disturbance to the subgrade during inclement weather. Structural fill placed on sloping ground should be constructed using a benched (stairstep) methodology. Benches should be cut level or with a slight downward incline into the slope in firm native soil. Benches should be at least 3 feet wide and wide enough to accommodate compaction equipment, and be a maximum of two feet high. Earthwork Procedures Conventional earthmoving equipment should be suitable for earthwork at this site. Earthwork may be difficult during periods of wet weather or if elevated soil moisture is present. Excavated site soils may not be suitable as structural fill depending on the soil moisture content and weather condit ions at the time of earthwork. If soils are stockpiled and wet weather is anticipated, the stockpile should be protected with securely anchored plastic sheeting. If stockpiled soils become unusable, it may become necessary to import clean, granular soils to complete wet weather site work. Wet or disturbed subgrade soils should be over-excavated to expose firm, non-yielding, non-organic soils and backfilled with compacted structural fill. We recommend the earthwork portion of this project be completed during extended periods of dry weather. If earthwork is completed during the wet season (typically late October through May) it may be necessary to take extra measures to protect subgrade soils. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 6 If earthwork takes place during freezing conditions, we recommend the exposed subgrade be allowed to thaw and be re-compacted prior to placing subsequent lifts of structural fill. Alternatively, the frozen soil can be removed to unfrozen soil and replaced with structural fill. The contractor is responsible for designing and constructing stable, temporary excavations (such as utility trenches) to maintain stability of excavation sides and bottoms. Excavations should be sloped or shored in the interest of safety following local and federal regulations, including current OSHA excavation and trench safety standards. Temporary excavation cuts should be sloped at inclinations of 1.5H:1V (Horizontal:Vertical) or flatter, unless the contractor can demonstrate the safety of steeper inclinations. Deeper excavations may require shoring. Permanent cut and fill slopes should be graded at inclinations of 2H:1V, or flatter. A geotechnical engineer and accredited testing material laboratory should be retained during the construction phase of the project to observe earthwork operations and to perform necessary tests and observations during subgrade preparation, placement and compaction of structural fill, and backfilling of excavations. Foundations Foundations can be placed on native soils or on structural fill above prepared native subgrades as described in this report. The following recommendations are for conventional spread footing foundations: Bearing Capacity (net allowable): 2,000 pounds per square foot (psf) for footings supported firm native soils or structural fill over native subgrades prepared as described in this report. Footing Width (Minimum): 18 inches (Strip) 24 inches (Column) Embedment Depth (Minimum): 18 inches (Exterior) 12 inches (Interior) Settlement: Total: < 1 inch Differential: < 1/2 inch (over 30 feet) Allowable Lateral Passive Resistance: 300 psf/ft* (below 18 inches) Allowable Coefficient of Friction: 0.35* *These values include a factor of safety of approximately 1.5. The net allowable bearing pressures presented above may be increased by one-third to resist transient, dynamic loads such as wind or seismic forces. Lateral resistance to footings should be ignored in the upper 12-inches from exterior finish grade. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 7 Foundation Construction Considerations All foundation subgrades should be free of water and loose soil prior to placing concrete, and should be prepared as recommended in this report. Concrete should be placed soon after excavating and compaction to reduce disturbance to bearing soils. Should soils at foundation level become excessively dry, disturbed, saturated, or frozen, the affected soil should be removed prior to placing concrete. We recommend SSGC observe all foundation subgrades prior to placement of concrete. Foundation Drainage Ground surface adjacent foundations should be sloped away from buildings. We recommend footing drains are installed around perimeter footings. Footing drains should include a minimum 4-inch diameter perforated rigid plastic or metal drain line installed at the base of the footing. The perforated drain lines should be connected to a tight line pipe that discharges to an approved storm drain receptor. The drain line should be surrounded by a zone of clean, free-draining granular material having less than 5 percent passing the No. 200 sieve or meeting the requirements of section 9-03.12(2) “Gravel Backfill for Walls” in the WSDOT M41-10 manual. The free-draining aggregate zone should be at least 12 inches wide and wrapped in filter fabric. The granular fill should extend to within 6 inches of final grade where it should be capped with compacted fill containing sufficient fines to reduce infiltration of surface water into the footing drains. Alternately, the ground surface can be paved with asphalt or concrete. Cleanouts are recommended for maintenance of the drain system. On-Grade Floor Slabs On-grade floor slabs should be placed on native soils or structural fill prepared as described in this report. We recommend a modulus subgrade reaction of 150 pounds per square inch per inch (psi/in) for native soil or compacted granular structural fill over native soil. We recommend a capillary break is provided between the prepared subgrade and bottom of slab. Capillary break material should be a minimum of 4 inches thick and consist of compacted clean, free-draining, well graded course sand and gravel. The capillary break material should contain less than 5 percent fines, based on that soil fraction passing the U.S. No. 4 sieve. Alternatively, a clean angular gravel such as No. 7 aggregate per Section 9-03.1(4) C of the WSDOT (M41-10) manual could be used for this purpose. We recommend positive separations and/or isolation joints are provided between slabs and foundations, and columns or utility lines to allow independent movement where needed. Backfill in interior trenches beneath slabs should be compacted in accordance with recommendations presented in this report. A vapor retarder should be considered beneath concrete slabs that will be covered with moisture sensitive or impervious coverings (such as tile, wood, etc.), or when the slab will support equipment or stored materials sensitive to moisture. We recommend the slab designer refer to ACI 302 and/or ACI 360 for procedures and limitations regarding the use and placement of vapor retarders. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 8 Seismic Considerations Seismic parameters and values in Table 2 are recommended based on the 2015 International Building Code (IBC). Table 2. Seismic Parameters PARAMETER VALUE 2018 International Building Code (IBC) Site Classification1 D Ss Spectral Acceleration for a Short Period 1.39 S1 Spectral Acceleration for a 1-Second Period 0.521g 1 Note: In general accordance with the 2018 International Building Code for risk categories I,II,III. IBC Site Class is based on the estimated characteristics of the upper 100 feet of the subsurface profile. Ss, and S1 values based on the OSHPD Seismic Design Maps website. Liquefaction Soil liquefaction is a condition where loose, typically granular soils located below the groundwater surface lose strength during ground shaking, and is often associated with earthquakes. The risk of liquefaction at this site is low for the design level earthquake based on the Thurston County Liquefaction Hazard Map, dated April 2011. A site-specific liquefaction analyses was not part of our scope and would be required to fully assess liquefaction potential and impacts. Infiltration Characteristics Infiltration facilities will be used to assist in control of stormwater, where feasible. An assessment of infiltration potential of the outwash in the lower eastern portion of the site was completed by performing one Pilot Infiltration Test per procedures in the Thurston County Drainage Design and Erosion Control Manual. Results of the test is presented in Table 3. Table 3. Infiltration Rates Sample ID and Depth (ft) Soil Type Measured Infiltration Rate (in/hr) Corrected Infiltration Rate (in/hr) Correction Factors* (Fg/Ft/Fp) PIT-1, 3 ft Outwash 62 28 (1.0/0.5/0.9) *Correction Factors from the Thurston County Drainage Design and Erosion Control Manual. The measured infiltration rate is considered appropriate for the soil tested and are similar to infiltration tests completed at other sites with similar soil throughout Thurston County. We recommend a design infiltration rate of 28 inches per hour (in/hr) for native outwash soils. However, groundwater was encountered at about Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 9 7 feet below the surface in this area and should be considered in the design of infiltration facilities. Infiltration in the clayey silt and till soils is not considered feasible. Additional infiltration assessment may be necessary in other portions of the site to assess infiltration potential once final grades have been established. Cation Exchange Capacity (CEC) and organic content tests were completed on samples of the outwash soil. Test results are summarized in the table below. Table 4. CEC and Organic Content Results Test Site, Sample Number, Depth CEC Results (milliequivalents) CEC Required* (milliequivalents) Organic Content Results (%) Organic Content Required* (%) TP-1, S-1, 3 ft 13.3 ≥ 5 5.30 ≥1.0 PIT-1, S-1, 3 ft 13.5 5.45 * Values from the Thurston County Drainage Design and Erosion Control Manual. Organic content and CEC results of the tested samples satisfy County requirements. Conventional Pavement Sections Subgrades for conventional pavements should be prepared as described in the “Subgrade Preparation” and “Structural Fill” sections of this report. Subgrades below pavement sections should be graded or crowned to promote drainage and not allow for ponding of water beneath the section. If drainage is not provided and ponding occurs, subgrade soils could become saturated, lose strength, and result in premature distress or failure of the section. In addition, the pavement surfacing should also be graded to promote drainage and reduce the potential for ponding of water on the pavement surface. We recommend a separation fabric (such as Mirafi N180, or other) is placed on roads underlain by clayey silt subgrades prior to placement of pavement section materials. The purpose of the fabric is to maintain segregation of the coarser fill and the lower finer grained native soil. Coarser fill will have the tendency to migrate into the looser native soil over time which can compromise the structural integrity of the pavement section fill and result in premature distress in the pavement without the separation fabric. Separation fabric is not considered necessary in roadways underlain by till or outwash. Minimum recommended pavement sections for conventional asphalt or concrete pavements are presented in Table 5. Pavement sections in public right-of-ways should be designed per City of Yelm (or Thurston County) standards. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 10 Table 5. Preliminary Pavement Sections Traffic Area Minimum Recommended Pavement Section Thickness (inches) Asphalt Concrete Surface1 Portland Cement Concrete2 Aggregate Base Course3,4 Subbase Aggregate5 Driveways 2 4 4 12 Access Roads 3 6 6 12 1 1/2 –inch nominal aggregate hot-mix asphalt (HMA) per WSDOT 9-03.8(1) 2 A 28 day minimum compressive strength of 4,000 psi and an allowable flexural strength of at least 250 psi 3 Crushed Surfacing Base Course per WSDOT 9-03.9(3) 4Although not required for structural support under concrete pavements, a minimum four-inch thick base course layer is recommended to help reduce potentials for slab curl, shrinkage cracking, and subgrade “pumping” through joints 5 Gravel Borrow per WSDOT 9-03.14(1) or Permeable Ballast WSDOT 9-03.9(1) or native soil compacted to 95% of ASTM D-1557 Conventional Pavement Maintenance The performance and lifespan of pavements can be significantly impacted by future maintenance. The above pavement sections represent minimum recommended thicknesses and, as such, periodic maintenance should be completed. Proper maintenance will slow the rate of pavement deterioration, and will improve pavement performance and life. Preventive maintenance consists of both localized maintenance (crack and joint sealing and patching) and global maintenance (surface sealing). Added maintenance measures and reduced pavement life should be anticipated over the lifetime of pavements if any existing fill or topsoil is left in-place beneath pavement sections. REPORT CONDITIONS This report has been prepared for the exclusive use of Mr. Matt Weber for specific application to the project discussed, and has been prepared in accordance with generally accepted geotechnical engineering practices in the area. No warranties, either express or implied, are intended or made. The analysis and recommendations presented in this report are based on observed soil conditions and test results at the indicated locations, and from other geologic information discussed. This report does not reflect variations that may occur across the site, or due to the modifying effects of construction, or weather. The nature and extent of such variations may not become evident until during or after construction. If variations appear, we should be immediately notified so that further evaluation and supplemental recommendations can be provided. This report was prepared for the planned type of development of the site as discussed herein. It is not valid for third party entities or alternate types of development on the site without the express written consent of Geotechnical Engineering Report The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 SSGC SSGC. If development plans change we should be notified to review those changes and modify our recommendations as necessary. The scope of services for this project does not include any environmental or biological assessment of the site including identification or prevention of pollutants, hazardous materials, or conditions. Other studies should be completed if the owner is concerned about the potential for contamination or pollution. We appreciate the opportunity to work with you on this project. Please contact us if additional information is required or we can be of further assistance. Respectfully, South Sound GeoteMchnical Consulting RO Timothy H. Roberts, P.E. Member/Geotechnical Engineer Attachments: Figure 1 — Exploration Plan Appendix A — Field Exploration Procedures and Test Pit Logs Appendix B — Laboratory Testing and Results Unified Soil Classification System TP-1 South Sound Geotechnical Consulting P.O. Box 39500 Lakewood, WA 98496 (253) 973-0515 Figure 1 – Exploration Plan The Summit at Thompson Creek Yelm, WA SSGC Project #22029 Base map from sheet drawing titled “Preliminary Site Plan - The Summit at Thompson Creek ”, by Informed AHBL, dated 3-16-22. N Legend Approximate Test Pit Location No Scale PIT - 1 PIT - 1 Approximate Infiltration Test Location TP-10 TP-4 TP-1 TP-5 TP-6 TP-3 TP-2 TP-9 TP-8 TP-11 TP-12 TP-13 TP-14 TP-15 TP-16 TP-17 TP-18 TP-19 TP-20 TP-7 Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 Appendix A Field Exploration Procedures and Test Pit Logs Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 A-1 Field Exploration Procedures Our field exploration for this project included twenty test pits and one Pilot Infiltration Test completed on April 14, 2022. The approximate locations of the explorations are shown on Figure 1, Exploration Plan. Test pit locations were determined by pacing from site features. Ground surface elevations referenced on the logs were inferred from topographic data from Google Earth satellite imagery and the Thurston County GIS. Test pit locations and elevations should be considered accurate only to the degree implied by the means and methods used. A private excavation company dug the test pits. Soil samples were collected and stored in moisture tight containers for further assessment and laboratory testing. Explorations were backfilled with excavated soils and tamped when completed. Please note that backfill in the explorations may settle with time. Backfill material located in roads or building areas should be re-excavated and recompacted, or replaced with structural fill. The following logs indicate the observed lithology of soils and other materials observed in the explorations at the time of excavation. Where a soil contact was observed to be gradational, our log indicates the average contact depth. Our logs also indicate the approximate depth to groundwater (where observed at the time of excavation), along with sample numbers and approximate sample depths. Soil descriptions on the logs are based on the Unified Soil Classification System. Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 1 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-1 Depth (feet) Material Description 0 – 1 1 – 4.5 4.5 – 5 Topsoil Fine to coarse sandy GRAVEL with some cobbles: Loose, moist, brown. (GP)(Glacial Outwash)(Sample S-1 @ 3 feet) Silty SAND with some gravel and a few cobbles: Medium dense, moist, gray. (SM) (Glacial Till). Test pit completed at approximately 5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 380 feet Test Pit TP-2 Depth (feet) Material Description 0 – 1 1 – 4.5 4.5 – 5.5 Topsoil Clayey SILT/Silty CLAY with some fine gravel: Soft to stiff, moist, mottled reddish brown to gray. (ML/CL) (Glacial Lake Deposits). Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 5.5 feet on 4/14/22. Slight seepage at 4 feet at time of excavation. Approximate surface elevation: 360 feet. Test Pit TP-3 Depth (feet) Material Description 0 – 1.0 1.0 – 4.5 4.5 – 5.5 Topsoil Sandy GRAVEL with trace to some silt and occasional cobble: Loose, moist, brown grading gray. (GP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, gray. (SM) (Glacial Till). Test pit completed at approximately 5.5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 360 feet Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 2 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-4 Depth (feet) Material Description 0 – 1 1 – 3 3 – 4 Topsoil Sandy GRAVEL with trace to some silt and occasional cobble: Loose, moist, brown grading gray. (GP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, gray. (SM) (Glacial Till). Test pit completed at approximately 4 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 365 feet Test Pit TP-5 Depth (feet) Material Description 0 – 1 1 – 4 4 – 5.5 Topsoil Sandy GRAVEL with trace to some silt and occasional cobble: Loose, moist, reddish brown. (GP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, gray. (SM) (Glacial Till). Test pit completed at approximately 5.5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 380 feet Test Pit TP-6 Depth (feet) Material Description 0 – 0.5 0.5 – 1.5 1.5 – 2.5 Topsoil Sandy GRAVEL with trace to some silt and occasional cobble: Loose, moist, reddish brown. (GP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 2.5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 395 feet Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 3 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-7 Depth (feet) Material Description 0 – 2.5 2.5 – 4 4 – 4.5 Topsoil/fill Organic silt, sand, gravel: Loose, moist dark brown. Silty SAND with gravel and some cobbles: Medium dense to dense, moist, mottled brown to gray. (SM) (Weathered Glacial Till). Silty SAND with gravel and cobbles: Dense to very dense, moist, gray, massive. (SM) (Glacial Till) Test pit completed at approximately 4.5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 380 feet Test Pit TP-8 Depth (feet) Material Description 0 – 0.5 0.5 – 4 Topsoil Silty SAND with gravel and a few cobbles: Medium dense to dense, moist, brown grading gray. (SM) (Glacial Till). Test pit completed at approximately 4 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 360 feet. Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 4 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-9 Depth (feet) Material Description 0 – 0.5 0.5 – 4 4 – 5 Topsoil Sandy GRAVEL with trace to some silt and occasional cobble: Loose, dry to moist, light brown grading gray. (GP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 360 feet Test Pit TP-10 Depth (feet) Material Description 0 – 0.5 0.5 – 5 5 – 5.5 Topsoil Sandy GRAVEL with trace to some silt and occasional cobble: Loose, dry to moist, light brown grading gray. (GP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 5.5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 360 feet Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 5 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-11 Depth (feet) Material Description 0 – 0.5 0.5 – 3 3 – 5 5 – 6 Topsoil Fine to coarse sandy GRAVEL and a few cobbles grades medium to coarse gravelly fine to medium sand at 2.0-3.0 feet: Loose, moist, brown. (SP/GP). (Outwash) Fine to medium SAND with a trace of gravel: Loose, moist, gray. (SP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 6 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 358 feet Test Pit TP-12 Depth (feet) Material Description 0 – 0.5 0.5 – 3.5 3.5 – 4 Topsoil Clayey SILT/Silty CLAY with some fine gravel: Soft to stiff, moist, reddish brown grading to gray at 4.0 feet (ML/CL) (Glacial Lake Deposits). Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 4 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 350 feet Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 6 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-13 Depth (feet) Material Description 0 – 0.5 0.5 – 2 2 – 5.5 Topsoil SILT with variable clay and fine gravel: Soft to stiff, moist, reddish brown grading to gray at 4.0 feet (ML) (Glacial Lake Deposits). Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 5.5 feet on 4/14/22. Moderate seepage at 2 feet observed at time of excavation. Approximate surface elevation: 350 feet Test Pit TP-14 Depth (feet) Material Description 0 – 0.5 0.5 – 5 5 – 6 Topsoil SILT with variable clay and fine gravel: Soft to stiff, moist, reddish brown grading to gray at 4.0 feet (ML) (Glacial Lake Deposits). Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 6 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 355 feet. Test Pit TP-15 Depth (feet) Material Description 0 – 0.5 0.5 – 4 4 – 5 Topsoil Sandy GRAVEL with some cobbles and a few boulders: Loose, dry to moist, light brown grading to gray at 3.0 feet. (GP) (Outwash) Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 5 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 355 feet Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 7 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-16 Depth (feet) Material Description 0 – 0.5 0.5 – 6 6 – 7 Topsoil SILT with variable clay and fine gravel: Soft to stiff, moist, reddish brown grading to gray at 4.0 feet (ML) (Glacial Lake Deposits). Silty SAND with gravel and a few cobbles: Dense, moist, brownish gray. (SM) (Glacial Till). Test pit completed at approximately 7 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 380 feet. Test Pit TP-17 Depth (feet) Material Description 0 – 0.5 0.5 – 11 Topsoil Cobbly fine to coarse GRAVEL with sand: Loose to medium dense, moist to wet, black grading to light brown below 3.0 feet. (GP) (Outwash) Test pit completed at approximately 11 feet on 4/14/22. Groundwater and sloughing observed at 7 feet at time of excavation. Approximate surface elevation: 335 feet. Test Pit TP-18 Depth (feet) Material Description 0 – 0.5 0.5 – 10 Topsoil Medium to coarse sandy GRAVEL with cobbles and boulders: Loose to medium dense, moist to wet at 9 feet, black grading to light brown below 3.0 feet. (GP) (Outwash). Test pit completed at approximately 10 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 335 feet. Project: Summit at Thompson Creek SSGC Job # 22029 EXPLORATION LOGS PAGE 8 OF 8 Location: 14444 Berry Valley Rd, Yelm, WA EXPLORATION LOGS FIGURE A-1 South Sound Geotechnical Consulting TP-1 to TP-20, PIT-1 Logged by: THR Test Pit TP-19 Depth (feet) Material Description 0 – 0.5 0.5 – 8 Topsoil Medium to coarse sandy GRAVEL with cobbles and boulders: Loose, moist, black grading to light brown below 3.0 feet. (GP) (Outwash). Test pit completed at approximately 8 feet on 4/14/22. Groundwater not observed at time of excavation. Approximate surface elevation: 340 feet. Test Pit TP-20 Depth (feet) Material Description 0 – 0.5 0.5 – 5.0 Topsoil Medium to coarse sandy GRAVEL with cobbles and boulders: Loose, moist, black grading to light brown below 3.0 feet. (GP) (Outwash). Test pit completed at approximately 5 feet on 4/14/22 due to caving. Groundwater not observed at time of the excavation. Approximate surface elevation: 340 feet. Infiltration Test PIT-1 Depth (feet) Material Description 0 – 0.5 0.5 – 5 Topsoil Cobbly fine to coarse GRAVEL with boulders with some sand: Loose, moist, black grading to light brown below 3.0 feet. (GP) (Glacial Outwash) (Sample S-1 @ 3 feet). Test hole completed at approximately 5 feet on 4/14/22. Groundwater not observed at time of excavation. Infiltration test completed at 3 feet. Approximate surface elevation: 335 feet. Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 Appendix B Laboratory Testing and Results Geotechnical Engineering Report SSGC The Summit at Thompson Creek Yelm, Washington SSGC Project No. 22029 June 16, 2022 B-1 Laboratory Testing Select soil samples were tested for organic content and cation exchange capacity (CEC) by Northwest Agricultural Consultants of Kennewick, Washington. Results of the laboratory testing are included in this appendix. 2545 W Falls Avenue Kennewick, WA 99336 509.783.7450 www.nwag.com lab@nwag.com Sample ID Organic Matter Cation Exchange Capacity Pit-1, S-1 5.45% 13.5 meq/100g TP-1, S-1 5.30% 13.3 meq/100g Method ASTM D2974 EPA 9081 South Sound Geotechnical Consulting PO Box 39500 Lakewood, WA 98496 Report: 59040-1-1 Date: April 25, 2022 Project No: 22029 Project Name: Berry Valley UNIFIED SOIL CLASSIFICATION SYSTEM Criteria for Assigning Group Symbols and Group Names Using Laboratory TestsA Soil Classification Group Symbol Group NameB Coarse Grained Soils More than 50% retained on No. 200 sieve Gravels More than 50% of coarse fraction retained on No. 4 sieve Clean Gravels Less than 5% finesC Cu  4 and 1  Cc  3E GW Well-graded gravelF Cu  4 and/or 1  Cc  3E GP Poorly graded gravelF Gravels with Fines More than 12% finesC Fines classify as ML or MH GM Silty gravelF,G, H Fines classify as CL or CH GC Clayey gravelF,G,H Sands 50% or more of coarse fraction passes No. 4 sieve Clean Sands Less than 5% finesD Cu  6 and 1  Cc  3E SW Well-graded sandI Cu  6 and/or 1  Cc  3E SP Poorly graded sandI Sands with Fines More than 12% finesD Fines classify as ML or MH SM Silty sandG,H,I Fines Classify as CL or CH SC Clayey sandG,H,I Fine-Grained Soils 50% or more passes the No. 200 sieve Silts and Clays Liquid limit less than 50 inorganic PI  7 and plots on or above “A” lineJ CL Lean clayK,L,M PI  4 or plots below “A” lineJ ML SiltK,L,M organic Liquid limit - oven dried  0.75 OL Organic clayK,L,M,N Liquid limit - not dried Organic siltK,L,M,O Silts and Clays Liquid limit 50 or more inorganic PI plots on or above “A” line CH Fat clayK,L,M PI plots below “A” line MH Elastic SiltK,L,M organic Liquid limit - oven dried  0.75 OH Organic clayK,L,M,P Liquid limit - not dried Organic siltK,L,M,Q Highly organic soils Primarily organic matter, dark in color, and organic odor PT Peat A Based on the material passing the 3-in. (75-mm) sieve B If field sample contained cobbles or boulders, or both, add “with cobbles or boulders, or both” to group name. C Gravels with 5 to 12% fines require dual symbols: GW -GM well-graded gravel with silt, GW -GC well-graded gravel with clay, GP-GM poorly graded gravel with silt, GP-GC poorly graded gravel with clay. D Sands with 5 to 12% fines require dual symbols: SW -SM well-graded sand with silt, SW -SC well-graded sand with clay, SP-SM poorly graded sand with silt, SP-SC poorly graded sand with clay E Cu = D60/D10 Cc = 6010 2 30 DxD )(D F If soil contains  15% sand, add “with sand” to group name. G If fines classify as CL-ML, use dual symbol GC-GM, or SC-SM. HIf fines are organic, add “with organic fines” to group name. I If soil contains  15% gravel, add “with gravel” to group name. J If Atterberg limits plot in shaded area, soil is a CL-ML, silty clay. K If soil contains 15 to 29% plus No. 200, add “with sand” or “with gravel,” whichever is predominant. L If soil contains  30% plus No. 200 predominantly sand, add “sandy” to group name. M If soil contains  30% plus No. 200, predominantly gravel, add “gravelly” to group name. N PI  4 and plots on or above “A” line. O PI  4 or plots below “A” line. P PI plots on or above “A” line. Q PI plots below “A” line.