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Drainage Report
Five Corners Commercial Building Preliminary Drainage Report March 2005 Received LIAR 3 0 2005 DESIGN/BUILD .CIVIL AND TRANSPORTATION ENGINEERING. PLANNING .SURVEYING Consulting Group Preliminary Drainage Report Project Information Project: Prepared for: Contact: Five Corners Commercial Building Yelm, Washington March 2005 Five Corners Commercial Building R.E. Paigen Construction Randy Paigen PO Box 625 Yelm, WA 98597 (360) 458-5633 Reviewing Agency Jurisdiction: City of Yelm, Washington Project Number: Project Contact: Project Engineer Prepared by: SCA Consulting Group 4200 6th. Ave. SE, Lacey, WA 98509 (360) 493-6002 FAX (360) 493-2476 Contact Robert E. Holcomb SCA Project: 04106 File Number: g:\text\pf\04106\Reports\04106_pdr.rtf PROJECT ENGINEERS CERTIFICATION: I hereby certify that this Preliminary Drainage Report for the Five Corners Commercial Building in Yelm Washington has been prepared by me or under my supervision and meets the intent of the City of Yelm Development Guidelines and Washington State Department of Ecology (WSDGE) Stormwater Management Manual for the Puget Sound Basin unless noted otherwise, and normal standards of engineering practice. I understand that the jurisdiction does not and will not assume liability for the sufficiency, suitability, or performance of drainage facilities designed for this development. n ~ ~.~` ag ~ ~~ ~ ~' =~*. si ,y ~~ ~ 2,z '-': '~ M ...;+p-" ;5,, .f~tr ~t Ap , Ste! 7 ~!F'~4:.. ~! W ~..~~.'Sj •'~ ~~.~YT.w.~~ M~ ~ ~ j ~ ~ li' J'..:. t TABLE OF CONTENTS PART I STORM DRAINAGE REPORT.......» ............................»»»......»....»»..........»......»......... 1 SECTION 1 - PROPOSED PROJECT DESCRIPTION .................................. ...1 SECTION 2 -EXISTING CONDITIONS .......................................................... ..3 SECTION 3 -INFILTRATION RATES ............................................................ ..3 SECTION 4 -WELLS AND SEPTIC SYSTEMS .............................................. ..3 SECTION 5 - FUEL TANKS ........................................................................... ..3 SECTION 6 - SUB-BASIN DESCRIPTION ......................................................3 SECTION 7 - ANALYSIS OF 100-YEAR FLOOD ........................................ ..4 SECTION 8 - AESTHETIC CONSIDERATIONS FOR FACILITIES ........... ..4 SECTION 9 - DOWNSTREAM ANALYSIS AND FACILITY SIZING~....... ..4 SECTION 10 -COVENANTS, DEDICATIONS, EASEMENTS ..................... ..4 PART II -EROSION CONTROL REPORT .....»» ....................»..»............»........................»...... 5 SECTION 1 - CONSTRUCTION SEQUENCE AND PROCEDURE ............. ..5 SECTION 2 - TRAPPING SEDIMENT ........................................................... ..5 SECTION 3 - PERMANENT EROSION CONTROL & SITE RESTORATION ........................................................................ ..6 SECTION 4 - GEOTECHNICAL ANALYSIS AND REPORT ...................... ..6 SECTION 5 - INSPECTION SEQUENCE ...................................................... ..6 SECTION 6 - CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS 6 PART III -MAINTENANCE PLAN .»........»..»......»....»....»..»»......»..»......» ......................»»..». 7 SECTION 1 - REQUIRED MAINTENANCE ................................................. ..9 SECTION 2 - RESPONSIBLE ORGANIZATION .......................................... 16 SECTION 3 - VEGETATION MANAGEMENT PLAN ................................. 16 SECTION 4 - SOURCE CONTROL ................................................................ 16 APPENDICES Appendix 1-Preliminary Drainage Calculations Appendix II -Preliminary Drainage and TESC Plan Appendix Q[ - FEMA FIRM Map Appendix IV Soils map Appendix V -Facility Summary Forms Appendix VI -Vicinity Map ii Part I Storm Drainage Report Five Comers Commercial Building Preliminary Drainage Report PART I STORM DRAINAGE REPORT SECTION 1 - PROPOSED PROJECT DESCRIPTION Project Proponent Parcel Numbers: Total Site Area: Zoned: Site Address: 98597 Required Permits: Section, Township, Range: Site Location: R.E. Paigen Construction Randy Paigen PO Box 625 Yelm, WA 98597 (360) 458-5633 64303300100 0.71 Acres C-2 Intersection of Morris Road and Bald Hills Road, Yelm, WA Grading, Utility, Building, Plumbing, Electrical, Mechanical etc. Section 29, Township 17 North, Range 2 East, W.M., Thurston County, WA The site is located in Yelm, Washington at the intersection of Morris Road and Bald Hills Road. Project Overview: The proposal is to construct a 6955 square foot commercial building on the existing vacant parcel. The development of the proposed site will include appropriate erosion control measures as needed, grading, storm drainage improvements, frontage improvements and extension of underground utilities including water and sanitary sewer. Storm Drainage Improvements: The completed project will create 0.16 acres of new roof, 0.26 acres of pervious parking, 0.02 areas of impervious sidewalks, and 0.27 acres of disturbed pervious area. All project areas (roads, walks, roofs) are accounted for below SCA Consulting Group Page 1 March 2005 Five Comers Commercial Building Preliminary Drainage Report Table 1 Post-Development Basin Summary Basin "A" Im ervious Roof 6 955 sf/0.16 ac Impervious Sidewalk 683 sf/0.02ac Disturbed 11,761sf/0.27 ac Pervious Pervious 11,589 sf/0.26 ac Parking, Sidewalk and Drivewa s Total Develo ed Area 0.71 aC Stormwater Treatment: Stormwater treatment requirements are based on the 1992 edition of the WSDOE Stormwater Management Manual. Preliminary treatment calculations are provided in Appendix I. Basin `A': Basin `A' includes the parking lot and the sidewalks. Runoff from the parking lot and sidewalks will be directed toward a catch basin, which will flow into a storm filter, which has been sized to exceed the minimum treatment requirements of the DOE Stormwater Manual. Stormwater Storage/Infiltration: Stormwater storage and infiltration requirements are based on the 1992 edition of the WSDOE Stormwater Management Manual using a design infiltration rate of 20- inches/hour. Preliminary storage and infiltration calculations are provided in Appendix I. StormShed software was used to size the infiltration facilities. Roof runoff will be tightlined and discharged directly into the infiltration facilities. Basin `A': Treated stormwater runoff conveyed through the storm filter, as well as roof runoff from the building, will discharge into an underground rock gallery for storage and infiltration to groundwater. The proposed gallery volume of 8,369 cf exceeds the minimum-modeling requirement of 8,101 cf. Stora a Ca acit Summar Basin ID Impervious Area Includin Roo Disturbed Pervious Area Storage ~l> Re uired Storage Provided Basin A 0.45 ac 0.29 ac 8,101 cf 8,369 cf (1) Based on design infiltration rate of 20-inches/hour using StormShed modeling software for the 100-year storm event SCA Consulting Group Page 2 March 2005 Five Comers Commercial Building Preliminary Drainage Report Roof Runoff All roof runoff from the proposed commercial development will be tightlined to the onsite galleries for storage and infiltration to groundwater. See basin descriptions above. SECTION 2 -EXISTING CONDITIONS The site is 0.71 acre triangular in shape with 150 feet fronting Bald Hills Road, 300 feet fronting on realigned Morris Road .and 360 feet on the Morris Road Cal-de-sac. The site is fairly flat with gentle slopes to the south. 352. The site is currently vacant land. The site is covered with a small locust grove and with indigenous field grasses. There are no creeks, lakes, ponds, springs, wetlands, ravines, gullies, steep slopes or other environmentally sensitive areas identified onsite or down gradient of the subject property. The site is located in an aquifer sensitive area, according to the 1986 Thurston County Comprehensive Plan M-8. The site is not located in a wellhead protection area. SECTION 3 -INFILTRATION RATES The Soil Conservation Service (SCS) Soil Survey of Thurston County classifies onsite soils as Spanaway (110) series. The design infiltration rate of 20 in/hr was assumed for the purposes of this study. It is reasonable infiltration rate for this soil group in Yelm Area. SECTION 4 -WELLS AND SEPTIC SYSTEMS No onsite wells were found during our site investigation of the proposed site. No onsite well logs were found at the Department of Ecology. No abandoned or existing septic systems were identified during SCA's site investigation or at the Thurston County Development Services office. Any septic system found will be removed in accordance with Thurston County Department of Health standards. SECTION 5 - FUEL TANKS No fuel tanks were located during SCA's site inspection or during soils work. Additionally, a review of the DOE's Leaking Underground Storage Tank (LUST) list did not indicate any existing or abandoned fuel tanks on the project site. SECTION 6 - SUB-BASIN DESCRIPTION The project site is located in the Yelm Creek Drainage Sub-Basin, Nisqually River Drainage Basin per Thurston County Comprehensive Map M-4. During SCA's site investigation and soils analysis, it appeared that all onsite stormwater runoff is contained onsite and infiltrated back into the groundwater, which is typical of the site's soil classification. All onsite stormwater runoff will be contained and infiltrated onsite. SCA Consulting Group Page 3 March 2005 Five Comers Commercial Building Preliminary Drainage Report There does not appear to be any significant existing offsite drainage to the property. As discussed previously, the proposed development has been divided into three drainage sub- basins. No hazardous materials handling is anticipated in the area tributary to the storm drainage facilities. SECTION 7 - ANALYSIS OF 100-YEAR FLOOD This project does not lie adjacent to or contain a stream onsite and has not been identified as a 100-year flood hazard area. A FEMA FIRM Map is included in Appendix III. SECTION 8 - AESTHETIC CONSIDERATIONS FOR FACILITIES The storm drainage facilities are located underground. All disturbed pervious areas will be vegetated and landscaped. SECTION 9 - DOWNSTREAM ANALYSIS AND FACILITY SIZING Sizing calculations for the project's stormwater treatment, storage, and infiltration facilities are provided in Appendix I of this report. All calculations correspond to the Preliminary Grading, Drainage and TESC Plan, which can be found in Appendix II of this report. Since all stormwater will be infiltrated onsite, a downstream analysis was deemed unnecessary. SECTION 10 - COVENANTS, DEDICATIONS, EASEMENTS Onsite drainage facilities including pipes, wet vaults, and infiltration galleries will require routine maintenance. The maintenance manual prepared for the project will list the maintenance requirements. A copy of the completed Maintenance Manual can be supplied to the City upon completion of the project. SCA Consulting Group Page 4 March 2005 Part II Erosion Control Report Five Comers Commercial Building Preliminary Drainage Report PART II -EROSION CONTROL REPORT SECTION 1 - CONSTRUCTION SEQUENCE AND PROCEDURE The proposed commercial development will include site grading and erosion control measures designed to contain silt and soil within the project boundaries during construction until permanent vegetation and site improvements are in place. Erosion/sedimentation control shall be achieved by a combination of structuraUvegetative cover measures and construction practices tailored to fit the site. Best Management Practices (BMP's) will be employed to properly clear and grade the site and to schedule construction activities. Before any construction begins onsite, erosion control facilities shall first be installed. The planned construction sequence is as follows: 1. Schedule preconstruction conference with the city, contractor, project engineer, and construction-staking surveyor. 2. Install rock construction entrance. Use 4" to 8" diameter spalls with 12" minimum depth. 3. Install filter fabric fencing in the locations shown on the plans. 4. Clear site (grubbing and rough grading). 5. Maintain equipment and water supply for dust control. 6. Designate an area for washing concrete trucks to control the runoff and eliminate entry into the storm drainage system. ?. Install underground utilities (water, sewer, storm). 8. Provide inlet protection around all new catch basins. 9. Construct roadway and parking and install landscaping, sod and/or seed, and mulch all disturbed areas. 10. Maintain all erosion control facilities until the entire site is stabilized and silt runoff ceases. SECTION 2 - TRAPPING SEDIMENT Filter fabric fencing will be installed to trap sediment before runoff exits the site. In addition, inlet protection will be installed around all existing and new catch basins to filter out sediment before runoff enters the storm system. A stabilized construction entrance will be installed to prevent construction vehicles from tracking soil onto roadways. If sediment is tracked offsite, it shall be swept or shoveled from paved surfaces on a daily basis, so that it is not washed into existing catch basins or other storm drainage facilities. During the rainy season from November 1 through March 31, the contractor must cover any disturbed areas greater that 5,000 SF in size if they will be unworked for more than 12 hours. Mulch, sodding, or plastic covering shall be used to prevent erosion in these areas. SCA Consulting Group Page 5 March 2005 Five Comers Commercial Building Preliminary Drainage Report SECTION 3 - PERMANENT EROSION CONTROL 8~ SITE RESTORATION All disturbed areas will be paved with asphalt, covered by buildings, or landscaped with grass, shrubbery, or trees per the landscaping plans. SECTION 4 - GEOTECHNICAL ANALYSIS AND REPORT None of the storm drainage facilities are located near the top of a steep slope. Therefore, a geotechnical analysis for slope or soil stability was deemed unnecessary. See Appendix V for a complete soils description. SECTION 5 - INSPECTION SEQUENCE In addition to required City inspections, the Project Engineer will inspect facilities related to stormwater treatment, erosion control, storage, and conveyance during construction. At a minimum, the following items shall be inspected at the time specified: 1. The erosion control facilities shall be inspected before the start of clearing and grading to ensure the following structures are in place: a. Construction Entrance b. Filter Fabric Fences c. Inlet protection of new catch basins 2. The conveyance systems will be inspected after construction of the facilities, but before project completion to ensure the following items are in working order: a. Pavement Drainage b. Catch Basins c. Conveyance Piping d. Roof Drain Piping 3. The infiltration galleries shall be inspected during construction to ensure that the facility is constructed to design specifications. 4. The permanent site restoration measures shall be inspected after landscaping is completed. A final inspection shall be performed to verify final grades, settings of structures and all necessary information to complete the Engineer's Construction Inspection Report Form. This form must be completed prior to final public works construction approval. SECTION 6 - CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS The contractor will be required to designate a wash down area for concrete trucks as well as a temporary stockpile area for construction debris. Catch basin inlet protection and filter fabric fencing shall remain in place until construction on the site is complete. SCA Consulting Group Page 6 March 2005 Part III Maintenance Plan Five Comers Commercial Building Preliminary Drainage Report PART III -MAINTENANCE PLAN INSTRUCTIONS FOR MAINTENANCE OF STORM DRAINAGE FACILITIES The following pages contain maintenance needs for most components that are part of the drainage system. A checklist should be completed for all system components according to the following schedule: 1. Monthly from November through April 2. Once in late summer (preferably September) 3. After any major storm (use 1" in 24-hours as a guideline) items marked "S" only. Using photocopies of these pages, check off the problems identified with each inspection. Add comments on problems found and actions taken. Keep these "checked" sheets in a file, as they will be used to write the annual report (due in May of each year). Some items do not need to be checked with every inspection. Use the suggested frequency at the left of each item as a guideline for the inspections. The City of Yelm is available for technical assistance. Do not hesitate to call, especially if it appears that a problem may exist. SCA Consulting Group Page 7 March 2005 Five Comers Commercial Building Preliminary Drainage Report ATTACHMENT "A": MAINTENANCE PROGRAM COVER SHEET Inspection Period: Number of Sheets Attached: Date Inspected: Name of Inspector: Inspector's Signature: SCA Consulting Group March 2005 Page 8 Five Comers Commercial Building Preliminary Drainage Report SECTION 1 - REQUIRED MAINTENANCE The drainage facilities will require occasional maintenance. The checklists below are the minimum maintenance requirements and inspection frequencies. Maintenance Checklist for Conveyance Systems (Pipes and Swales) Frequency Drainage Problem Conditions to Check For Conditions That Should System Req'd Exist Feature M.S. Pipes Sediment & Accumulated sediment that Pipe cleaned of all debris exceeds 20% of the diameter of sediment and debris. the pipe. M Vegetation Vegetation that reduces free All vegetation removed movement of water through pipes. so water flows freely. A Damaged Protective coating is damaged, Pipe repaired or replaced. (rusted, rust is causing more than 50% bent or deterioration to any part of pipe. crushed) M Any dent that significantly Pipe repaired or replaced. impedes flow (i.e., decreases the cross section area of pipe by more then 20%). M Pipe has major cracks or tears Pipe repaired or replaced. allowing groundwater leakage. M.S. Swales Trash & Dumping of yard wastes such as Remove trash and debris debris grass clippings and branches into and dispose as prescribed Swale. Accumulation of non- by City Waste degradable materials such as Management Section. glass, plastic, metal, foam and coated paper. M Sediment Accumulated sediment that Swale cleaned of all buildup exceeds 20% of the design depth. sediment and debris so that it matches design. M Vegetation Grass cover is sparse and weedy Aerate soils and reseed not or areas are overgrown with and mulch bare areas. growing or woody vegetation. Maintain grass height at a overgrown minimum of 6" for best stormwater treatment. Remove woody growth, recontour and reseed as necessary. M Conversion Swale has been filled in or If possible, speak with by owner to blocked by shed, woodpile, owner and request that incompatibl shrubbery, etc. Swale area be restored. e use Contact City to report problem if not rectified voluntarily. A Swale does Water stands in Swale or flow A survey may be needed not drain velocity is very slow. Stagnation to check grades. Grades occurs. need to be in 1% range if wa~~wc. a giauc is ~c~s SCA Consulting Group Page 9 March 2005 Five Comers Commercial Building Preliminary Drainage Report Frequency Drainage Problem Conditions to Check For Conditions That Should System Req'd Exist Feature possible. If grade is less than 1%, underdrains may need to be installed. If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Comments: Key: A =Annual (March or April preferred) M =Monthly (see schedule) S =After major storms SCA Consulting Group Page 10 March 2005 Five Comers Commercial Building Preliminary Drainage Report ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Catch Basins and Inlets Frequency Drainage Problem Conditions to Check For Conditions That System Should Exist Feature M.S. General Trash, debris and Trash or debris in front of No trash or debris sediment in or on the catch basin opening is located basin blocking capacity by more immediately in than 10%. front of catch basin opening. Grate is kept clean and allows water to enter. M Sediment or debris (in the No sediment or basin) that exceeds 1/3 the debris in the catch depth from the bottom of basin. Catch basin basin to invert of the is dug out and lowest pipe into or out of clean. the basin. M.S. Trash or debris in any inlet Inlet and outlet or pipe blocking more than pipes free of trash 1/3 of its height. or debris. M Structural Corner of frame extends Frame is even with damage to frame more than 3/4" past curb curb. and/or top slab face into the street (if applicable). M Top slab has holes larger Top slab is free of than 2 square inches or holes and cracks. cracks wider than 1/4" (intent is to make sure all material is running into the basin). M Frame not sitting flush on Frame is sitting top slab, i.e., separation of flush on top slab. more than 3/4" of the frame from the top slabs. A Cracks in basin Cracks wider than 1/2" and Basin replaced or walls bottom longer than 3', any repaired to design evidence of soil particles standards. Contact entering catch basin a professional through cracks or engineer for maintenance person judges evaluation. that structure is unsound. A Cracks wider than 1/2" and No cracks more longer than 1' at the joint than I/4" wide at of any inlet/outlet pipe or the joint of any evidence of soil inlet/outlet pipe. particles entering catch basin through cracks. SCA Consulting Group Page 11 March 2005 Five Comers Commercial Building Preliminary Drainage Report Frequency Drainage Problem Conditions to Check For Conditions That System Should Exist Feature A Settlement/mis- Basin has settled more than Basin replaced or alignment 1" or has rotated more than repaired to design 2" out of alignment. standards. Contact a professional engineer for evaluation. M.S. Fire hazard or Presence of chemicals such No color, odor or other pollution as natural gas, oil and sludge. Basin is gasoline. Obnoxious dug out and clean. color, odor or sludge noted. M.S. Outlet pipe is Vegetation or roots No vegetation or clogged with growing in inlet/outlet pipe root growth vegetation joints that is more than 6" present. tall and less than 6" apart. If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Comments: Key: A =Annual (March or April preferred) M =Monthly (see schedule) S =After major storms SCA Consulting Group Page 12 March 2005 Five Comers Commercial Building Preliminary Drainage Report ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Infiltration Systems Frequency Drainage ~ Problem Conditions to Check For Conditions That Should System Exist Feature M,S General Trash & See Maintenance See Maintenance debris Checklist for Ponds. Checklist for Ponds. buildup in pond M Poisonous See Maintenance See Maintenance vegetation Checklist for Ponds. Checklist for Ponds. M,S Fire hazard See Maintenance See Maintenance or pollution Checklist for Ponds. Checklist for Ponds. M Vegetation See Maintenance See Maintenance not growing Checklist for Ponds. Checklist for Ponds. or is overgrown M Rodent See Maintenance See Maintenance holes Checklist for Ponds. Checklist for Ponds. M Insects See Maintenance See Maintenance Checklist for Ponds. Checklist for Ponds. A Storage `~ Sediment A soil texture test Sediment is removed area buildup in indicates facility is not and/or facility is cleaned system working at its designed so that infiltration capabilities or was system works according incorrectly designed. to design. A sediment trapping area is installed to reduce sediment transport into infiltration area. A ~ Storage A soil texture test Additional volume is area drains indicates facility is not added through slowly working at its designed excavation to provide (more than capabilities or was needed storage. Soil is 48 hours) incorrectly designed. aerated and rototilled to or improve drainage. overflows Contact the City for information on its requirements regarding excavation. SCA Consulting Group Page 13 March 2005 Five Comers Commercial Building Preliminary Drainage Report M Sediment Any sediment and debris Clean out sump to design trapping filling area to 10% of depth. area depth from sump bottom-to-bottom of outlet pipe or obstructing flow into the connector pipe. One Time Sediment Stormwater enters Add a trapping area by trapping infiltration area directly constructing a sump for area not without treatment. settling of solids. present Segregate settling area from rest of facility. Contact City for guidance. M Rock ~ Sediment By visual inspection Replace gravel in rock filters and debris little or no water flows filter. through filter during heavy rainstorms. S Infiltratio Infiltration Standing Water in Excavate bottom of n Failure Inspection Well After trench as necessary but Trenches 48 hours after storm or at least 3 feet. Replace Overflow during Storms with crushed rock. Check pretreatment systems for effectiveness. Check tributary area for sediment sources. If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Comments: e A =Annual (March or Aprfl preferred) M =Monthly (see schedule) S =After major storms SCA Consulting Group Page 14 March 2005 Five Comers Commercial Building Preliminary Drainage Report ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Grounds (Landscaping) Frequen Drainage ~ Problem Conditions to Check Conditions That Should cy System For Exist Feature M General ~ Weeds Weeds growing in Weeds present in less (nonpoisono more than 20% of the than 5% of the landscaped us) landscaped area (trees area. and shrubs only). M ~ Safety Any presence of poison No poisonous vegetation hazard ivy or other poisonous or insect nests present in vegetation or insect landscaped area. nests. M,S ~ Trash or See Ponds Checklist. See Ponds Checklist. litter M,S ~ Erosion of Noticeable rills are Causes of erosion are Ground seen in landscaped identified and steps taken Surface areas. to slow down/spread out the water. Eroded areas are filled, contoured, and seeded. A Trees and `~ Damage Limbs or parts of trees Trim trees/shrubs to shrubs or shrubs that are split restore shape. Replace or broken which affect trees/shrubs with severe more than 25% of the damage. total foliage of the tree or shrub. M '~ Trees or shrubs that Replant tree, inspecting have been blown down for injury to stem or roots. or knocked over. Replace if severely damaged. A ~ Trees or shrubs, which Place stakes and rubber- are not adequately coated ties around young supported or are trees/shrubs for support. leaning over, causing exposure of the roots. If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Comments: Kev A =Annual (March or April preferred) M =Monthly (see schedule) S =After major storms SCA Consulting Group Page 15 March 2005 Five Comers Commercial Building Preliminary Drainage Report SECTION 2 - RESPONSIBLE ORGANIZATION The project owner shall be responsible for the operations and maintenance of all onsite storm drainage facilities. SECTION 3 - VEGETATION MANAGEMENT PLAN All disturbed pervious areas on the site will be landscaped to provide an aesthetically pleasing environment. SECTION 4 - SOURCE CONTROL Warning signs (e.g., "Dump No Waste -Drains to Groundwater") will be embossed or painted on or adjacent to all storm drain inlets and will be repainted periodically as necessary. SCA Consulting Group Page 16 March 2005 Appendix I Preliminary Drainage Calculations PRELIMINARY DRAINAGE CALCULATIONS The following calculations are based on the requirements contained in the 1992 Washington State Department of Ecology (WSDOE) Stormwater Management Manual for the Puget Sound Basin. DESIGN AND BASIN INFORMATION SUMMARY: Soil Classification (Soil Survey of Thurston County, WA): SCS Soil Classification: Hydrologic Group: Design Infiltration Rate: Spanaway, Nisqually B 20 inches hour SCS Runoff Curve Number: (Table III-1.3 WSDOE Storm Manual) Post-developed (Lawns, 75% + grass cover): CN = 80 Post-development (impervious) CN = 98 Pre-development CN = 64 Rainfall Design Storms: (WSDOE Isopluvial Maps -App. AIII-1.1 of WSDOE Storm Manual) 6 month storm (64% of 2 yr. storm) = 1.28" 2 yr./24 hour storm = 2.0" 10 yr./24 hour storm = 3.0" 100 yr./24 hour storm = 4.0" The detailed calculations will be provided with final drainage report. Post-Development Basin Summary Stormwater Treatment: Basin "A": Treatment Event Summary: Basin "A" Im ervious Roof 6,955 sf/0.16 ac Impervious Sidewalk 683 sf/0.02ac Disturbed 11,761sf/0.27 ac Pervious Pervious 11,589 sf/0.26 ac Parking, Sidewalk and Drivewa s Total Develo ed Area 0.71 aC BasinlD Peak Q Peak T Peak Vol Area ------ (cfs) (hrs) (ac-ft) ac Treatment 0.08 8.00 0.0296 0.56 reatment 0.38 .00 .1361 Method Raintype Event /Loss SCS/SCS TYPEIA 6 mo 0.56 SCS/SCS TYPEIA 100 yr Drainage Area: Treatment Hyd Method: SCS Unit Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Into: 10.00 min Area CN TC Pervious 0.2700 ac 80.00 0.29 hrs Impervious 0.2900 ac 98.00 0.05 hrs Total 0.5600 ac Supporting Data: Pervious CN Data: Landscaping 80.00 0.2700 ac Impervious CN Data: Impervious 98.00 0.2900 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet accross Landscaping 98.00 ft 1.00% 0.1500 16.09 min Sheet accross paking lot 75.00 ft 1.00% 0.0110 1.61 min Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet accross parking lot 150.00 ft 1.00% 0.0110 2.80 min MOVEHYD [Treatment] TO [Treatment - 6 mo] AS [6 mo] Peak Flow: 0.0782 cfs Peak Time: 8.00 hrs Hyd Vol: 1289.20 cf - 0.0296 acft MOVEHYD [Treatment] TO [Treatment -100 yr] AS [100 yr] Peak Flow: 0.3781 cfs Peak Time: 8.00 hrs Hyd Vol: 5927.49 cf - 0.1361 acft Size Compost Filter StormSHED was used to model this basin based on a 6 month design storm event, SCS methodology, Type 1A rainfall, 10 minute time interval, and an abstract coefficient of 0.2. StormSHED resulted in a design (6 month) storm water flow rate of u.08 cfs = 35'.0 gpm StormSHED resulted in a peak (100 year) storm water flow rate of 0.38 cfs = 189.5gpm Starmwafer tilaragement Reference: catalog Radial flow cartridges required 2.3 Therefore, use 3 15gpm/cartridge F~ecas stormfilter size 6'x8' r~i;i,- Nominal exterior dimensions "x9' r~r:ie Maximum capacity of stomtfilter = 4S.Ogpm > 55.0 gpm, therefore is adequate Stormwater Storage and Infiltration: Basin "A": Infltration Event Summary: BasinlD Peak Q Peak T Peak Vol Area ------- (cfs) (hrs) (ac-ft) ac Infltration 0.12 8.00 0.0435 0.71 Infltration 0.22 8.00 0.0782 0.71 Infltration 0.37 8.00 0.1302 0.71 Infltration 0.52 8.00 0.1843 0.71 Drainage Area: Infltration Hyd Method: SCS Unit Hyd Peak Factor: 484.00 Storm Dur: 24.00 hrs Area Pervious 0.2600 ac Impervious 0.4500 ac Total 0.7100 ac Supporting Data: Pervious CN Data: Landscaping Impervious CN Data: Parking lot and Sidewalks Roof Pervious TC Data: Flow type: Description: Sheet accross landscapin Impervious TC Data: Flow type: Description: Sheet accross parking lot Method Raintype Event /Loss SCS/SCS TYPEIA 6 mo SCS/SCS TYPE1A 2 yr SCS/SCS TYPEIA 10 yr SCS/SCS TYPEIA 100 yr Loss Method: SCS CN Number SCS Abs: 0.20 Inty: 10.00 min CN TC 80.00 0.27 hrs 98.00 0.05 hrs 80.00 0.2600 ac 98.00 0.2900 ac 98.00 0.1600 ac Length: Slope: Coeff: 98.00 ft 1.00% 0.1500 Length: Slope: Coeff: 150.00 ft 1.00% g 0.0110 Travel Time 16.09 min Travel Time 2.80 min MOVEHYD [Infltration] TO [Infltration - 6 mo] AS [6 mo] Peak Flow: 0.1213 cfs Peak Time: 8.00 hrs Hyd Vol: 1894.70 cf - 0.0435 acft MOVEHYD [Infltration] TO [Infltration - 2 yr] AS [2 yr] Peak Flow: 0.2180 cfs Peak Time: 8.00 hrs Hyd Vol: 3407.27 cf - 0.0782 acft MOVEHYD [Infltration] TO [Infltration -10 yr] AS [10 yr] Peak Flow: 0.3664 cfs Peak Time: 8.00 hrs Hyd Vol: 5669.41 cf - 0.1302 acft MOVEHYD [Infltration] TO [Infltration -100 yr] AS [100 yr] Peak Flow: 0.5227 cfs Peak Time: 8.00 hrs Hyd Vol: 8030.17 cf - 0.1843 acft Vmin= 8,]01'cf 2) Stormwater Storage Volume Provided: The required volume of 8,101` cf will be stored and infiltrated using 6 under round infiltration drainrock allery(ies) 150 ft. long x 6 ft. wide x 5 ft. deep with ~ft. diameter perforated pipes. Total gallery storage capacity using 3:1 void ratio: V = N[(L'(W'H-Apipe))'0.3+(Apipe`L)] = 8, 369 cf Storage Volume = 8,389 cf > Required Volume = 8,101 cf Therefore is Adequate. 3) 48-Hour Drawdown: Volume infiltrated = 288,000 cf / 48hrs > 8,10t cf Therefore is Adequate. Appendix II Preliminary Drainage and TESC Plan :: i ,,I y I _ __ _.. _. . _.._.._..._. _..._.._ _ -t - - - --- -. .,,... _ -.._.. _ _.._ __._ :~;. ._ _.. ~ __- - -__.__..__._ _...- •- - MORRIS RD. CULDESAC - ~. - ~'~ } ~« T :_ . ..a_ . . : 31.'~ _. ?t~; 4 - ...... --s*^^aa-^.^.r - :5=: --:-i- ~•-~•`-t T _.. ..... ~ ~`_ f,.~n. ~ ~. ~>i~~~J% E: ,T r'~?~J ~•w%' ~°~' .?E \ v~ ~ ~ ~~i' L~ 1 `y~+L ~'S~T~r~ r~-r ~ ~ ti.. \ ~~~ ;~ :`~ ~ ~. •~. ~ \ .\`` ,~ ,,,~ ~\ ~\ Y ~ `\ k~~. Y ~~ ~~~ ~~~ '.~ ~\ ~' `~ ~ ~ i ~ ~\ \\ ~ , k ,~: ~~ ~~ ,/ \ , 0 a N sir O II ~ -~~ N O m 1 X Z i r: I ~ z ~ ~ O ' I ~ ~ 8 `~~' :~w ~ I I I ~ s ~ ~, ~ ~ ~ ~ C ~ i ~ CZi A ~ o ~ m A ° _ Z Z ~ rn Z C +~ ~ s z "' z '^ s rn z ° I A Z n O m E C ~ N A = ; m m < fZ~l ~ s rn Q 0 ~ 2 Z m z m ~~ ~ ~ /,- ,~ ; . r .~' ,, s, 14-T ~ i : ~~ ~~ .<~r. ~ /. n ~ ~ ~~t~ t~ 1.3 % ~/~5~ s _~ ~ ~,~~ , ' p;,, ~ /. ~ ~ ~ P ~ (T / / 4 / ~~ .~ ~. A/ a s '~} s,y` ~~ ~,_ ....: ,' /% , /, ~~ vm oO~marcr"y1ZQ~~ry~ ~~~~'gq a~ ,~iirA144=pQiix~litlpQ~oAO~nO ~D 002 X~ ~N ZSn'ND~;~ym m6~_~ZAy 40 ~N A(^~m ON fD Vj QjFD DS ~mI ArwAc >~ ~$nG'1QiOD W Z ODON°VI A2 ~[~. t"~~t~i~~ u A A°Kr~ ~ O~ > C n~~~ N W ~ N O~ v A ~RI O°7C A N~NN~A 4 A ° k g~~~~-zi o Z ~,i „ y ~ ~~~zo 70C N N +' mm A D O m g N r a w 0 A D r N ~ ~ ~~ b Y C i Z -1 4l Z D r~ m _1 Z 1V ~D N m 3 ~ ND. DATE RENSIDN = po ~~ ~ C~ ~ DESIGNED BY: FIVE CORNERS ~~ ~ Nu 7 ~ ~ ~~ C - to ~ s g , • , CHECKED BY: ` ~s ' ~ COM PRELIMINARY SITE ~; m y a ;~s fO A~ MERCIAL iN >m s ! ~ ^•.._ 6 PLAN Z ~ DATE: ,~,~~ ~~ ~g BUILDING SCALE: 1~ = 20~ YELM WASHINGTON ~~~ ~~. D c Z O m 0 c z 0 r O C1 D D 1 I O A N P Ur y y N m m m O 0 0 0 O 0 0 -yl ~ ~ yyyZ yvy $~~-yl ~y-Zy.~~-yi A-y/ '-' A ~ ~~~~ ~ Qp~~ ~ ?y ~ .. 4~ yy~ ~A ~n Z ZNmC O Z ~ > n QZ ADO nl /lm ~~,y 0 m=~ m ~ G m S D " ~ y AS~=A C n O 2~'~ p ~ 2 ~y i i Q1~ZZ ~Zi ~''~ m r°,i g wh=o 4m~ Q g ~ pg~ °gp ~ ~ w ~~_ ~~g r~. ~<u~ ~'~ v-iz ~wo W m D-m~1y o i Zm~ to yL Z ~3 ~ m Qi ~ga ~ ; ~` ~ m ~ ~ 'T1 `.\ `• \ \ / - ~ ~ O z ~ m \ ~( / ~ / ` ~ / 1 "I / ~ ~ ~ ~ ~ z ~ O r'70 ~ :: , ~ ; .: ~ ~ ~ oo Z X ~ / ~ ' ~ a ~ ~ /~ ~ 3 o ~ . Z ~ m \ G ~'~~ ~,~~ Y/ n Z \ i C O N N F ~ ,. ~' f I`` 1 Y j ~ T , .. ~ '- ~~. ~ I o ~ ~,A~, ; ~ I ~~ ~~ ~ D A A -y-1 S O ~ N ~ n y; ~ ~ ~ irl .Z~-1 < O~ RI ~ 4~ fib f7 ~ f7 g A A ~ $ ~ ~~ p~ '~y ~ A A rr~ ~ Z r~1 = m~ m m Z D m C ~ "' y p~ ~ m v a z y ~ ~ > Z m 4 m ~' < m -~ i n m ~i~c ~~D~~C y m ~ ° A n ~ bm~~~ Z ~7~ 3~~~= NF~l~g Ro~moii m S ~ ~ K y~~Zg o $,Z ~ `1~ ~ ~~~ Q m~= '~Xs= N~2L(~y 11. ~'T F~m„ N mrNi,~= Y° ~~~~ C ~ T,y m ^~mo o~ o a 0 ~~ S z ~n ~n° ~ y~ nu. uA~E REN90N w ~ }p p ~ ~ 5 0 DE4DNE0 BY: ~ ~; o ~w°a`~; ~~~ Via. ~ DRANNRY: Nu i FIVE CORNERS PRELIMINARY ~^' ~ ~~ R= ~~r ~~amr~ CNECNEDDY: COMMERCIAL i~ N am sp a ~ ~~6 ~:l1~' ~ ~ ~1~ o GRADING/DRAINAGE ~~ zy ~~~~~- oAiE: 1/14105 ~, ; BUILDING ~$~SCALE: 1~ = 20~ Erb 8~ T.E.S.C. PLAN YELM WASHINGTON pN ~ L v; ~~ ,i*e ~ m~ ~~~~~~ SA ~ ~ 8 ~ o ~ VARIES ~ , ~ ~ g ~ ~; ~ > i Q ~ ' ~ ~ : ~ ~ ~ ~ m Z ~ ., }n m ~ ~ p ~~ J` ~ ~ D ~ i t;*i f/1 v i --1 > ~ E fn ~" I `d, I z m m •" I .I ~ v4" ~`a ~ ~`~ ~ o m ~~ ~ L~ I D ' _~~~ SIR>~ K ~ N 0 .~ ` ~ DO~~ 2Z~~ ~ ~ + ~ ~ ~ ~ ~~~ ~ I m ~ o n ~o=~ p{fir golr~i _ I i. r O ~~~ •o. hx=fig mho ` ,~ \/ s~< ~ ~ ~ :~ C s < ~ ~ ~ 1 o ~ m ~ ~ ~', VARIES ~ ~~ ~ (1' MIN. ~ ~~ /. \ ~~ \/ ~ / i ,,, o^ "A , ~ I rngN y \ ~ /. N ~` '~ 4i~ Z Z ~ }`R yyyg A _ _ _ ,. \ ~ ~~~~ I \ ~ ~ ~ ~ , ~/ / 0 (~ ~ n " ~ ~ ~ " m / O~ ~ II ~ \. o U ~ ~ 6 ~~ ; ~ ~ ~' ~ ~~ ~ "a ~ 171 C m m ~" ~- { O n ~ ` • m ~ .. ~~ q ° ~_~ ~ ~ ~_ ~ ~ 4.5' ~l~mn^ ~/ ~ ~ of ~ p~ ~ ~ ~ cam -~ <z o ~" Fi >/ D :' y O _ ~ ~ ~ ~~ 'A g~~ ~~ ~ ~ ~ ~~~ ~~ ~ Z ~s ~ 16 MIN. 2' MB~ 7~ ~~ z; z o~ N ~ ~ L ~ ~ Sd z y Z m ~ ~ ~ ~ 58 ~~* ~~ ~ s ~ ~ ~~ ~Z~ ~ ~P~ ~$ ~~ ~~ ~~ ~ a~~ ~~ ~8 ~ q~ p ~ g s ~~ ~ ~. All o; ~ ~~ 4 ~~ P~g pR~ ~ ~' ~~~ ~~ ~~ ~ ~ 4 4I4 4 a ~ ~ y ~R~~g~ ~~~~~~~ ~, ~ s^~r ~ ~ ' o g =~ ~u ~~~ ~~ ~ ~~ "~~ ~~~ ~° e~ ~~ ~~ ~~~ ~ ~ ~~ ~ ~ ~~~~ ~ ~~ ~~ ~ ~ ~~ ~ ~ age ~ ~~ ~~ ~~~ gI~~ U ~ ~ ~ ~~ ~p ~~ ~~ ~~ g~ s~ ~ ~~ NO. DALE RENSION ~ Q C7 DESIGNED BY: 9N oA ~~~ =5 ~ FIVE CORNERS >, o _ ~ ~ ~ ~ DRANNBY: Nu '' TSEC,GRADING io -o o ~ R = ~ ~. ~ ~ ~ ~ ~~ CNECKED BY; ~ ~ COMMERCIAL iN w ~; $m ~ s ~, ~~6 ~,~_ _ ~ ~~ ho AND DRAINAGE ~~ ~g ~ DATE: N/ts~oa ~ erg' BUILDING DETAILS scA~e. YELM WASHINGTON ~~ ~ ~ ~ ~ ~ D ~ Ff `~~ d ~ 2 z d ~ ~ ~ ~ ~o y ~ C7 Z ~ ~ n z -, ~ ~ z ~ ~3 nu ~ S • v ~~ Z ~ ~1Q /~ ~ ~l Z l~ ~ ~ ~ r-rl ~ ~~ ~ _ _~ ~ $ ~~1 °z _ ~~- a-~ ~ r d ~a ~M ~I~ Y'~ ~• ~ 9f ~ ~ ~~ $m~ ~ ~~ ~ ~ $a ~~ ~ ~, .:.~e.:. ~ C7 ~ ~aA G7 Z ~ ~~ -~ ~ A6@ ~ " a1o' ~ry (T~ ~' ~ ~ ~~ TI D ~ ~ r m N _ ~=~_ ,: _ _.. .. - --- ,. ---- `. ,_ , -- ..-:. .:..;i__ ~~ - ------ Y . ., ~, h. .l ~.\ { \ /\~/ ~\ ~~~ \ ~ a ~ : 's~ \ _. _.. y~ O ~ .,~ ~~~ ~ ~. ~ ~ ~~ a can A ~~ f i ~~ ~~ ~''. ,~ / A Ca1~ N (d ~ j~ ~~ ~ I,' r ~ ,- / ~ ~ n ~ ii r _ / /, 1 O ,~ ;' ~ O 1 ~O ml p I ~RNp l io~ o=o-~ 7omcz ' + RI Z a 'N'1 ~-Ni y aa C~1D2 ~yD~i<~ D . y t i, ~ F ~F F ~~?"_' ~ N+~Ax s ~ ~ ~ _ I ~'~z N~~ ~u+,~~3~ 0 .~ -~ . ~1 _ ~ ~ ~ ~n~ '~ ~ ~7 y pr 7C -N-1 L O = 2 yy ~~ In ~ g ~ ~~~ ~x~1~np A .: I I I I 5 m ~ o ~m~ NZC ~^~~~ I I 1 I I ~ m ~ j6 a~i~z ,~ ~~_ ~ < ~ I ~ D ~ ~ ~ N =CA5'A Z~~~ s'~ i I m ~ s ~'~ m p m N.i_ f ~ a~ I ~ m ~ ADO p; O~ Z D D N < GJ A O N D cB~ ~ A f) ~ CAS 'OD f r N N~ N O A = C c ~ ~ A A om ~ ~ ~ o?o 's y m ~ '~ D ~ ~I m mm~ ~ j m ~ ~ C ~ C ~ Z C ~ m = v m Z C A A p ~ 1 ~ Z~ ~~'~T 2 Z~ O ~ m ~ m m ~ D i O Z; C ~ Z = m = m ~ < m m = `°A ~ nNy ~>g= g ~6~~ ~ gF~~ ~ ~ uo~Qc I^ N~ZA ~pN1 Z A 0 ~ O A o o ' d 0 m A r ~n~ 0 ~~ ~m ~~ ~ ~O Z r ~o z m C 171 v ~' 3 Z N0. DALE REVISION _ ~~ ~ ~ 5 o DESIGNED BY: ~ FIVE CORNERS > p a' ~ ~ q ~ ~ DRAWN RY: NU iA ~ ~_ ~_ ~~~~ ~~~ ~~~ CMECKEDBY: i PRELIMINARY o ~, ~_ $m ~~~~ ~~~my ~~ ~ COMMERCIAL UTILITY PLAN iN 7m p ~ ~~ j$6 ~~ DALE: ,n4i~ ~~ flro,~° BUILDING SCALE: 1~ - 20 ~~ WASHINGTON MORRIS RD.CULDESAC ---- ------- ----_-_- _ -_- '~~ w ~ ~ ;_ r.;~j7iT ~- ~ ' ~ y~y , j' ? My~,'[~ 1~rr ~,ty ~~': a .i~' ~ ' .; ~~ y >~ l ~ f ~~ ~` -;' ~ .. ~ . ~:-~~ Y,?°+!~ s`y~K. ~'' fT,~CT RSA 1 ~ '~t ;1+ ~i, ("`fi't ~WS^ i' ,~7f ~7 T 'S~ ' ' ~ ~ ~~ FL ~ ~ -t'4~ Waw;y ~ ~ ~~ , ~ .i~~. * ~ ,, ~ j Y/ ~ V.' - t Y T \ S ~ ia~owc zaxc r \ ~ CF ~ / • \ ~( ~ Z t7 ~• / • \ ~ ` / / ~ • • \ ~~ •A • \ ` ` ~ i J~!C I.-Yrs .,,G'i ' ~ a~ Z \ \ ~ ~ ~ '~ \ .o-a Z ~ \ - ` rl .~ ~~ y'i~~Je~ ~ r' ~~ / • ~ D ! ~ o ' ~ o \ ` c` ~r ~ ~'i ? • ~ N O ~ N A • \ ~ \ • \ ~ •~ ~ Z rn < m m '~ N nrn ~ m \ ~ ..i DO o - Z r~ ` ' z C rn ~ ~ v ~' 3 Z ~Z~~~ ° ~~~~~~ a ~ rnm~ x ~~c ~ ~ ~~ -~ a g ~ N ~ -~ 4 ~ ~ z g ~om $ m ~ m n ~~ Y~ °c ~ ~~~~Q N ~j Z # ti m K Z 4 4 N + Y.~ C[~ QV~ N ` ~ Z ~~ y S - T U) ' g < O r ~ ym„ m "~~ N en ~ a r .Yo ~~~~ ~ ~~~~ mmm o ~ o se ~ p ,$, g S (~, DE9GNED 8Y: 8H REN90N o > o ~ ~ ~ ~ ~- ~ DanxN er: NU tlpp S °~ _ FIVE CORNERS PRELIMINARY iT N z~ $~ ~~~ ~§~ ~~ CHECNEDBY: ~ -- COMMERCIAL N °; $` s ~ A~~ ~:! - ~1~ ox LANSCAPING m ~ ~ ~ ~ ~ 5 ~ ~~.._ DATE: 1/74/05 y ~ ~` p ~ ~g ~ ~ 810 BUILDING PLAN SCALE: - ~~ = Z~' YELM WASHINGTON Appendix III FEMA FIRMMap w m -~ z J W Z U Q ~ a ~ Q o ~ ~ w w ~ o ~ o n w U X W ~~ \ 4 i~ ,~ • ~~' •~ ~• ^ p i ~` © • a ~a~ sia~ow ~.~, "~-~ rt. Ls ~~~ao • • ~°~~~.~ 'kf 3 H lfl C?S • Q `' ~., .~~ ~~:~, >~/!~ ~~ • ~ 4~ ['~ _ ~ ~ `~~ • 0 -- . U ~ IW- ~ ~ ~.~./~ ~ "~ ~ ~. ,' W ~ ~ O o r ~. a Q J Q W Z O W ~ LL ~ a _.~~ ~ o ~i°' ~ ,~ ~U Appendix IV Soils Map I- Q U Z m I- (/7 _J (n J Q U ~ O m p~~ } S J_ m W ~' W a ~ o Q r Q J W 3 O~ z H a a ~. ~ v 1~ ~~ .. ~ v. o~~ 0P r--i .r .~~ .-~ .c;° r--1 e-~ ~ W W '"'4 W ~ ~ O 'v ~' s a a N J O N w z 0 U a _.~. ~ o ~~ ~ ~~ 0 U Appendix V Facility Summary Forms THURSTON REGION FACILITY SUMMARY FORM Complete one (1) for each facility (detention/retention, coalescing plate filter, etc.) on the project site. Attach 8 1/2 x 11 sketch showing location of facility. Proponent's Facility Name or Identifier (e.g., Pond A): See Part h Name of Road or Street to Access Facility: Morns Road. Hearings Examiner Case Number.• Development Rev. Project No./Bldg Permit No.: Parcel Number: 64303300100 To be completed by Utility Staff: Utility Facility Number Project Number (num) Parcel Number Status: (num, Ich) 0, Known; i, Public; 2 Unknown; 3, Unassigned Basin and Subbasin: (num, 6ch) (Zch for basin, 2ch for subbasin, 2ch future Responsible jurisdiction: (alpha, lch) Part ~ - p*n7eCt NTlrie aildprppnnPnt Project Name: Five Corners Commercial Building Project Owner: R.E. Pai~en Construction Project Contact: Randy Pai~en Address: PO Box 625. Yelm. WA 98597 Phone: (360) 458-5633 Project Proponent.• (if different) Same Address: ,Same Phone: - -~m~ Project Engineer: ~e~ert ~ Nel~ei~~€~P ~' Firm: SE.,4 ~~+asarJtaMSCCr~arp Phone: r36,' ~~~ ~9G1,~ Section ~Q Township 17N Range 2F. Part 3 - T~Te ~fPe~it .e,n~~n Type of permit (e.g., Commercial Bldg: Commercial Building Other Permits (circle) ^DOF/W HPA ^COE 404 ^COE Wetlands ^DOE Dam Safety ^FEMA ^Floodplain ^Shoreline Mgmt ^Rockery/Retaining Wall ^Encroachment ®Grading ^NPDES ^Other Plumbing, Electrical, Utility Other Agencies (Federal, State, Local, etc.) that have had or will review this Drainage Erosion Control Plan: N/A PaLt 4 -Prn,~nncPrl Prn,~iPrt i~PCr.rint~ inn What stream basin is this project in (e.g., Percival, Woodland): Nisqually River Project Size, acres 0.71 Zoning: C-2 Onsite: Residential Subdivision: N/A Number of Lots: Lot size (average), acres: Building Permit/Commercial Plat : 0.71 Building(s) Footprint, acres : 0.16 Concrete Paving, acres: 0.29 Gravel Surface, acres: 0 Lattice Block Paving, acres: 0 Public Roads (including gravel shoulder), acres: 0 Private Roads (including sidewalks), acres Onsite Impervious Surface Total, acres: 0.45 P?ct 5=pre-Qeve~oi ed Proecr_Siie rictirc Stream through site, y/n: No Name: DNR Type: Type of feature this facility discharges to (i.e., lake, stream, intermittent stream, pothole, roadside ditch, sheetflow to adjacent private property, etc.): Swales, Ravines, y/n: Steep slopes, (steeper than 1 S%) y/n: Erosion hazard, y/n: 100 yr. Floodplain, y/n: Lakes or Wetlands, y/n: Seeps/Springs, y/n: High Groundwater Table, y/n: Wellhead Protection or Aquifer Sensitive Area, y/n: No No No No No No No No PRLt 6 - F8C1~113LQ?~.rntinn - PQrviOllS~nver Pprkina 1 n1 Total Area Tributary to Facility Including Offsite (acres): 0.71 Total Onsite Area Tributary to Facility (acres): 0.71 Design Impervious Area Tributary to Facility (acres): 0.45 Design Landscaped Area Tributary to Facility (acres): 0.26 Design Total Tributary Area to Facility (acres): 0.71 Enter a one (1) for the type of facility: Wet pond detention Wet pond water surface area, acres Dry pond detention Underground detention 1 Infiltration pond Dry well infiltration Coalescing plate separator Centr j~ge separator Other: (Strom Filter) 1 Outlet type (Enter a one (1) for each type present) Filter Oil water separator Single orifice Multiple orifices Weir Spillway Pump(s) Other (infiltration to groundwater) 1 art 7 - RPIPacP to C}rnnnr~watPr Design Percolation Rate to Groundwater (if applicable) 20 in/hr Appendix VI Vicinity Map '~/ W ~ ~ o o r o a a Z V w Z 0 U Q J ~~~~ . O ~~ ,~ C U