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Drainage and Erosion Control Report 3-16-07 DEL'S FARM SUPPLY Drainage and Erosion Control Report Prepared for: Linda Michaelis DFS Properties, LLC 10N Fairway Drive East Hoodsport, WA 98548 (253) 312- 4467 March 13, 2007 Prepared by: David W. Spitler, PE Reviewed by: Steven D. Hatton, PE HATTON GODAT PANTIER 1840 Barnes Blvd SW Tumwater, WA 98512 (360) 943-1599 Project No: 05-055 Project Name: DEL'S FARM SUPPLY E:lofficelJOBS12005105-055-Del's Farm Supply - YeIm1RPT- Drainage-03.13.07.doc -rF; ,.~ ;~ TABLE OF CONTENTS I. YELM REGION FACILITY SUMMARY FORM .......................................................................3 II. DRAINAGE REPORT ...............................................................................................................7 Section 1 -Project Description .............................................................:.....---------.:...... ..7 Section 2 -Existing Conditions .......:.................................:.......................................... ..7 Section 3 -Soils Report ...............................................................:......................---:..... ..7 Section 4 -Wells and Septic Systems ..:.......:.............................................................. ..7 Section 5 -Fuel Tanks .........:..........:.........................................:................................. ..8 Section 6 -Analysis of 100-Year Flood ..................................:.................................... ..8 Section 7 -Aesthetic Considerations .......................................................:.................: ..8 Section 8 -Facility Sizing and Downstream Analysis ................................................. ..9 Section 9 -Covenants, Dedications, and Easements ................................................. 13 Section 10 -Articles of Incorporation ..............................................................:........... 13 III. EROSION CONTROL PLAN ...........................:..............:...................................................... 14 . Section 1 -Construction Sequence .....................:....................................................... 14 Section 2 -Trapping Sediment ..............................:................:.........:.......................... 14 Section 3 -Site Restoration ......................................................:.................................. 15 Section 4 - Geotechnical Analysis ........................................................................:...... 15 Section 5 -Inspection Sequence ..:..............:............................................................... 15 Section 6 -Control of Pollutants other than Sediments ..:........................................... 15 N. STORMWATER MAINTENANCE PLAN :...........................................................:................. 16 Appendix A -Site Plan Appendix B -Calculations I. YELM REGION FACILITY SUMMARY FORM Complete one for each facility (detention/retention, coalescing plate filter, etc.) on the project site. Attach 8'/z" by 11° sketch showing location of facility. Proponent's facility name or identifier (e.g., Pond A): Infiltration Pond Name of road or street to access facility: Bald Hills Road Hearings Examiner case number. Development Review Project No./Bldg. Permit No.: Parcel Number(s): 64303200700 To Be Complefed By Utility Staff: Utility facility number :......................................................... Parcel number status, (num, 1ch) ..................................... 0-Known; 1-Public; 2-Unknown; 3-Unassigned Basin and sub-basin, (num, 6ch) ....................................... (2ch-Basin; 2ch-Sub-basin; 2ch-Future Responsible jurisdiction, (alpha, 1ch) ................................ O-Olympia; C-County; T-Tumwater, L-Lacey Part 1 - Proiect Name and Prooonent Project name: Del's Farm Supply Project owner. DFS Properties, LLC Project contact: Linda Michealis Address: 10N Fairway Drive East, Hoodsport, WA 98548 Phone: (360) 877- 5420 Project proponent (if different): DFS Properties, LLC Address: 10N Fairway Drive East, Hoodsport, WA 98548 Phone: Project engineer: Firm: Phone number. DEL'S FARM SUPPLY Steven D. Hatton, PE HATTON GODAT PANTIER (360) 943-1599 03.13.07 PAGE 3 Part 2 - Project Location Section ............................. 24 Township ......................... 17N Range ------------------------------ 1 E Names and addresses of adjacent property owners: Part 3 - Tvae of Permit Aaalication Type of permit (e.g., commercial building): Other permits (~): ^ DOF NV HPA ^ COE Wetlands ^ FEMA ^ Shoreline Management ^ Encroachment ® Other Building Site Plan ^ COE 404 ^ DOE Dam Safety ^ Floodplain ^ Rockery/Retaining Wall ® Grading Other agencies (Federal, State, Local, etc.} that have or will review this Drainage and Erosion Control Plan: NONE DEL'S FARM SUPPLY 03.13.07 PAGE 4 Part 4 - Proaosed Project Descriation What stream basin is the project in (e.g., Percival, Woodland, etc.)? Yelm Zoning :......................... Commercial C-1 On-site: Residential Subdivision: Number of lots .......................................................... Lot size (average, acres) .......................................... Building Permit/Commercial Plat: Building(s) (footprint, acres) ..................................... 0.29 Concrete paving (acres) ........................................... Gravel surface (acres) .............................................. Lattice block paving (acres) ...................................... Public roads-including gravel shoulder (acres) ........ Private roads-including gravel shoulder (acres) ....... On-site impervious surface total (acres) .................... Part 5 -Pre-develoaed Proiect Site Characteristics: Stream through site (y/n) ......................................NO Name ............................................ N/A DNR Type ..................................... NIA Type of feature this facility discharges to (i.e., lake, stream, intermittent stream, pothole, roadside~ditch, sheetflow to adjacent property, etc.): TYPE OF DISCHARGE -Infiltration Steep slopes-steeper than 10% (y/n) ...................... N Erosion hazard (y/n) ................................................ N 100-yearfloodplain (y/n) .......................................... Y Wetlands (y/n) .......................................................... N Seeps/springs (y/n) .................................................. N High groundwater table (y/n) ................................... Y Other ...................................................................... DEL'S FARM SUPPLY 03.13.07 PAGE 5 i Part 6 -Facility Descriation Total area~tributary to facility including off-site (acres) ................... Total on-site area tributary to facility (acres) .................................. Design impervious area tributary to facility (acres) ......................... • Design landscaped area tributary to facility (acres) ................:....... Design total tributary area to facility (acres) ................................... Enter "1"for type of facility: Wet pond detention ................................................. Wet pond water surface area (acres) ..................... Dry pond detention ..........:...........................:.......... Underground detention :.......................................... Infiltration pond ....................................................... 1 Drywell infiltration .................................................... Coalescing plate separator ..................................... Centrifuge separator ............................................... Other ...:.........................•--•--................................... Outlet type (enter "1"for each type present): Filter ........................................................................ 1 OiUwater separator ................................................. Single orifice ........................................................... Multiple orifices ....................................................... Weir ...................................•-----...................---.......... Spillway ................................................................... Pump(s) ................................:................................. Other ...................................................................... Part 7 -Release to Groundwater Design percolation rate to groundwater (if applicable) .........................10 inches aer hour Part 8 -Release to Surface Water (if applicable) Thurston County MSL Percent Design Discharge To Surface Elevation ft. Full Volume cu. ft. Water cfs 0 0.00 0.00 25 50 100 DEL'S FARM SUPRLY 03.13.07 PAGE 6 II. DRAINAGE REPORT ,' Section 1 -Project Description ® This project proposal seeks approval to improve the existing Del's Farm site. The project will include frontage improvements along Bald Hills Road, replacement of fencing, adding new pavement, and increasing the number or parking spaces. The site currently has two buildings consisting of an 8,205 sf ® retail building and a 4,320. sf storage bam on 6.75 acres. The site is located east of the intersection of Yelm Avenue (SR 507) and Bald Hills Road. The parcel number for this project is 64303200700. The site is zoned Commercial (C-1 ), which allows the use. Stormwater improvements will be provided onsite for the project. City water and sewer service is available at the site and is proposed to service the site. This project will require site plan approval, grading and right-0f--way permits: Stormwater Best Management Practices will be provided for the project including water quality treatment. Treatment will consist of a bio-filtration Swale for Bald Hills Road improvements, and a wet pond for the on-site impervious areas. These facilities are designed to treat the 6-month event. Stormwater quantity runoff impacts are mitigated by an on-site infiltration pond. Appendix A contains a reduced copy of the ^ site plan. Approximately 4.9 acres of the site will remain in an undeveloped condition. In addition, i portions of the undeveloped area are being dedicated to the City for Yelm Avenue and Bald Hills Road. Descri tion /m envious Area (ac Total Area (ac) Area draining to infiltration pond Bald Hills Road (off-site) 0.26 0.34 Parking lot and roof area 1.55 1.55 Area draining to existing dry well 0.50 0.50 Area draining to landscaping 0.11 0.11 Area to remain in natural 4.70 condition (not drainin to pond Site total 2.42 6.75 Section 2 -Existing Conditions ® There is no significant offsite drainage tributary to the storm facilities. The Yelm Avenue right-of-way is located north of the site, and is lower than both the site and the parcel. The crown of Bald Hills Road ® prevents water from entering the drainage system from the southwest. The site generally drains to the east, at a maximum grade of 3%. The site is located within an aquifer recharge area. A small stream is located near the east property line. There are no other known wetlands, gullies, steep slopes, springs, or other environmentally sensitive areas on site or immediately down grade of the property. Section 3 -Soils Report The Thurston County Soils map list the soils on the site as Spanaway gravelly sandy loam. Infiltration rates for Spanaway soils are generally considered rapid. Based on site investigation, the design infiltration rate is 10 in/hr. DEL'S FARM SUPPLY 03.13.07 PAGE 7 r r i Section 4 -Wells and Septic Systems Records at Thurston County and, the Department of Ecology were searched in order to locate wells and septic systems that may be located within the setback distances from the stormwater pond or ponds. In addition, the Project Engineer, or someone under his direct supervision, has visited the site to verify the presence or absence of wells and septic systems as best can be done visually without trespassing onto other properties. All wells and septic systems found to be located within the setback distances from the stormwater pond, or ponds, have been shown on the plans. Section 5 -Fuel Tanks Records at Thurston County and the Department of Ecology were searched in order to locate the presence of above and below ground fuel storage tanks that may be located within the setback distances from the stormwater pond or ponds. In addition, the Project Engineer, or someone under his direct supervision, has visited the site to verify the presence or absence of fuel tanks as best can be done visually without trespassing onto other properties. All fuel tanks found to be located within the setback distances from the stormwater pond or ponds have been shown on the plans. Section 6 -Analysis of 100-Year Flood The Federal Emergency Management Agency prepares maps for all areas within Thurston County,' including the incorporated cities therein. Panel #50310-0001 A depicts the areas, if any, subjected to flooding in the vicinity of this proposal. By inspection of this map, this development area of this proposal appears to be located in Zone X, an area determined to be outside the 100-year flood plain. Section 7 -Aesthetic Considerations All stormwater facilities will be hydroseeded upon completion. Additional landscaping shall also be provided throughout the project in conformance with the approved landscaping and tree restoration plan, as applicable, and as otherwise required by the approving authority. DEL'S FARM SUPPLY 03.13.07 PAGE 8 J 1 Section 8 -Facility Sizing and Downstream Analysis This project has been designed per the requirements of the Stormwater Management Manual for the Puget Sound Basin published in 1992, that has been developed by the Washington State Department of Ecology. The stormwater conveyance system and drainage control features have been analyzed using the HYDRA computer modeling software that utilizes the SCS SBUH method. A copy of the HYDRA model is located in Appendix C. ~. J r Retention Pond Sizing The retention pond has been sized to infiltrate the volume of a 100-year, 24-hour storm event. The pond infiltration rate is as follows: Design infiltration rate = 10 inches per hour. The pond bottom area = 3,750 square feet. Qo,~ = 10 in x 1 ft x 1 hr x 2,532 sq. ft. 1 hr 12 in 3,600 sec Qo,~ = 0.59, cfs Stage/discharge relation of the retention pond can be found in Appendix C. The HYDRA model indicates that the peak storage volume required is 1,467 cubic feet fora 100-year, 24- hourstorm event. This volume is achieved at a Design Water Level {DWL). The total available storage volume in the pond is 8,488 cubic feet at a DWL of 349. Wet Pond Sizing: The wet pond was sized to meet the 1992 Washington State Department of Ecology's standards for the Puget Sound Basin (DOE). The pond will treat the on-site parking and roof area. The DOE standard is a pond with a permanent pool depth of 3~ feet deep, with the volume of the 6-month, 24-hour rainfall event. Step 1) Calculate the volume of the 6-month, 24-hour event. Volume = 6,227 cf Step 2) Confirm the wet pond volume is provided by the proposed pond. The plan is fora 4-foot deep wet pond with the following dimensions: An Excel spread sheet was used to estimate the volume of a 24 x 30 foot pond with 3 tot side slopes to be 6,237 cf at 4 feet deep. Use a 24 x 30 foot pond bottom with 3 to 1 side slopes for the wet pond. DEL'S FARM SUPPLY 03.13.07 PAGE 9 Bio-Filtration Swale Sizing Design based on Appendix AIII-6.1 of the DOE - Stormwater Management Manual for the Puget Sound Basin. Preliminary Steps (P) Step # P-1) Estimate the runoff flow rate (Q) for the 6-month frequency, 24-hour duration storm, according to methods outlined in Chapter III-1. The Hydra analysis estimated the 6-month and 100-year, 24-hour flow rate to be 0.09 ® and 0.32 cfs. P-2) ~ Bio-filtration Swales should be designed to have slopes between 2 and 4%. Refer to Manual if steeper or flatter slopes are required. Select a slope based on preliminary layout. The swales will be designed to have 1% slopes. i P-3) Select a vegetation cover suitable for the site. Refer to Table III-6.1 to select grass. The swales will be a tall fescue mixture. Design Steps (D) Step # D-1) Establish the height of vegetation during. the winter and the design depth of flow. The design ® depth should be at least 2-inches less than the winter vegetation height. The area will likely be mowed on a regular basis. Therefore, set the winter grass height at a minimum of 6-inches and the flow depth to 4-inches. D-2) Select a value of Manning's n from Table III-2.8 of the Manual. e Use n = 0.07 for d nse grass up to 6-inches high. D-3) Select the swale shape. Use a trapezoidal shape. D-4) Use Manning's equation and first approximations relating hydraulic radius and dimensions for the selected shape to obtain a working value of a bio-filter width dimension: For a trapezoidal section. b = Qn/(1.486 * y^1.667 * s^0.5) -zy Note that due to the small flows, the -zy has been deleted to give positive widths. y = 4 inches, s = 0.02, n = 0.07, and z = 3. b= 0.29 ft D-5) Calculate the area of the cross section. ' DEL S FARM SUPPLY 03.13.07 PAGE 10 ® .Area = by +zy^2 = 0.29*0.33 +3"0.33^2 = 0.43 sf D-6) Compute the flow velocity at design flow. This velocity should be less than 1.5 ft/sec. V = Q/A = 0.09 cfs/0.43 sf = 0.21 ft/s Velocity is less than 1.5 ft/s; design meets criteria Stability Check Steps (SC) SC-1) Unless runoff from events larger than the 6-month, 24-hour storm will bypass the bio-filter, pertorm the stability check for the 100-year, 24 hour storm. Estimate Q for the 100-year event. Qioo = 0.32 cfs SC-2) Estimate the vegetation coverage ("good° or "fair') and height on the first occasion that the bio- filterwill receive flow, or whenever the coverage and height will be least. Assume good coverage. S SC-3) Estimate the degree of retardance from Table III-6.2 of the Manual. D-Low. SCE) Establish the maximum permissible velocity for erosion prevention (Vmax) from Table III-6.3. 4 ft/sec for western wheatgrass. SC-5) Select a trail Manning's n. r n = 0.037 SC-6) Refer to Figure III-6.6 to obtain a first approximation. for VR. VR = 4.0 ® SC-7) Compute hydraulic radius, using the Vmax from step SC-4. R = VRNmax = 4.0/4 = 1 ' SC-8) Use Manning s equation to solve for the actual VR: VR = 1.486/' R 1~6s~ s o.s _ (1.486/0.037) 1.0 ~.ss~ 0.01 o.s = 4.01 SC-9) Compare the actual VR from step SC-8 and the first approximation from step SC-6. If they do not agree within 5 percent, repeat steps SC-5 to SC-9 until acceptable agreement is reached. 4.0 = 4.01, proceed to stem SC-10 . DEL'S FARM SUPPLY 03.13.07 PAGE 11 SC-10) Compute the actual V for the final design conditions; Check to be sure V < Vmax from step SC-4: V=VR/R=4.0/1.0=4.0 SC-11) Compute the required A for Stability. A = Q/V = 0.32 cfs/4.0 f/s = 0.08 sf SC-12) Compare the area computed in step SC-11 of the stability analysis with the area from the bio- filtration capacity analysis (step D-5). If less area is required for stability than is provided for capacity, the capacity design is acceptable. If not, use A from step SC-11 of Figure III-6.5 and recalculate channel dimensions. Use y from step D-1. Step D-5 Required an area of 0.42 sf, which is larger than the areas calculated in Step SC-11. Use the dimensions developed in the design steps. z=3 y=0.33ft b = 0.29 ft area = 0.43 sf T=b+2yz=2.27 SC-13) Calculate the depth of flow at the stability; y = (T-b)/2z for trapezoids. y = (2.27-0.29)/(2*3) = 0.33 SC-14) Compare the depth form step SC-13 to the depth used in the bio-filtration capacity design (step D-1 ). Use the larger and add 1-foot freeboard to obtain total required depth (yt). The depth is the same. Remember the base was increased to 0.5 for all swales in step D-4. The actual flow depths will not be the same for the treatment and 100-year events. Set yt equal to 1 + 0.33 = 1.33 ft SC-15) Recalculate the hydraulic radius; R = (byt + zyt^2)/(b + 2y(z^2 + 1)^0.5 R =[(0.29*1.33) + (3*1.33^2)]/ [0.29+ (2*1.33*(3^2 + 1) ^0.5) = 5.69/8.70 i = 0.65 SC-16) Make a final check for capacity based on the stability check design storm and maximum vegetation height and cover, using the Manning's Equation. Use a Manning's n = 0.1, A = byt + zyt^2 using b from step D-4a or D-15 or SC-12, as appropriate. Q = (1.486/0.1) (5.69) (0.65)^0.667 (0.01)^0.5 = 0.63 cfs ^ This is greater than the 100-year flow rate. DEL'S FARM SUPPLY 03.13.07 PAGE 12 Completion Steps (CO) CO-1) If the bio-filter is a swale, lay out the swale to obtain the maximum possible length. If a shorter than 200-foot swale must be used, increase A by an amount proportional to the reduction in the length below 200 feet. Due to limited area, the length must be reduced to 100-feet. Revise the area = (200/100)' 0.29 = 0.58 ft For construction reasons, the swales will be constructed with a 2-foot wide base. CO-2) If the swale longitudinal slope is greater than 4 percent, design log or rock check dams should be placed approximately every 50 feet. The slopes are all less than 4 percent. Section 9 -Covenants, Dedications, and Easements . All stormwater facilities located on private property shall be owned, operated, and maintained by the property owners, their heirs, successors, and assigns. The property owners shall enter into an agreement with the goveming body, a copy of which is included in Part V of this report. The agreement requires maintenance of the stormwater facilities in accordance with the maintenance plan provided and shall grant easement for access to the goveming body to inspect the stormwater facilities. The agreement also makes provisions for the goveming body to make repairs, after due notice is given to the ~; owners, if repairs are necessary to ensure proper performance of the stormwater system and if the . owners fail to make the necessary repairs. The cost of said repairs shall be borne by the property owners, their heirs, successors, and assigns. Section 10 -Articles of Incorporation Not applicable. ^ DEL'S FARM SUPPLY 03.13.07 PAGE 13 LJ III. EROSION CONTROL PLAN Section 1 -Construction Sequence Prior to commencing any grading or filling upon the site, all erosion control measures, including installation of a stabilized construction entrance, shall be installed in accordance with this plan and the details shown on the drawings. More specifically, the following construction sequence shall be observed: 1. Construction on this site shall be conducted substantially in accordance with the construction sequence described on the plans and in this erosion control plan. Deviations from this ^ sequence shall be submitted to the project engineer and permitting jurisdiction..Deviations must be approved prior to any site disturbing activity not contained within these plans. 2. For each phase of the development of this site, the following general sequence shall be observed: a. Install perimeter filter fabric fence as shown. b. Install inlet protection for existing inlets in the vicinity of areas to be disturbed. c. Call.for inspection by the project engineer. d. Construct temporary sedimentation trap(s) and outlet(s). e. Perform grading direc#ing site runoff Towards the sediment trap prior to discharge from the site.. f. Install temporary piping, as required, to direct runoff towards the sediment trap. 3. Once the site is disturbed, continue operations diligently toward completion. 4. Monitor all erosion control facilities, and repair, modify, or enhance as directed or as required. !. Section 2 -Trapping Sediment Protection of off-site properties against sedimentation is an absolute necessity. Additional measures may ^ be required to provide full protection of downstream areas. Additional measures may include, but are not limited to, use of sediment bags in existing catch basins, increased filters within sediment ponds such as hay bales, introduction of coagulants to the sediment ponds, and other such measures. Continuous . monitoring of the erosion control systems, depending upon site and weather conditions, shall be ongoing throughout project development. Vehicle tracking of mud off-site shall be avoided. Installation of a stabilized construction entrance shall be installed at the start of construction at the exit point to be used by the equipment. This entrance is a minimum requirement and may be supplemented if tracking of mud onto public rights-of-way becomes excessive. Washing down roads daily to remove excessive mud may be required.. Wash water shall be directed to the temporary sediment traps installed on-site and shall not be allowed to discharge downstream without treatment. DEL'S FARM SUPPLY 03.13.07 PAGE 14 Section 3 -Site Restoration Disturbed areas on and off-site shall be hydroseeded or otherwise landscaped or stabilized upon project completion to provide permanent erosion control where required. Erosion control measures shall remain in place until final site stabilization is imminent (e.g., paving scheduled with a favorable weather forecast). Section 4 - Geotechnical Analysis Existing slopes in the area of the stormwater ponds are at a maximum of 3%. The temporary sediment ponds will be excavated into the native soil. No embankment is required. Section 5 -Inspection Sequence The Project Engineer, or someone under his direct supervision, and the permit authority shall inspect the temporary erosion control facilities (construction entrance, sediment traps, and erosion control barriers) prior to commencement of construction. During and following construction, the Engineer shall inspect the construction of the permanent stormwater facilities and report to the permit authority his findings as to performance and operability of the completed system. Section 6 -Control of Pollutants other than Sediments A centralized equipment marshalling area and containment area is to be provided on-site for equipment maintenance and storage of.any equipment service materials. An area on-site will be selected as a temporary debris and stockpile area for materials that will be removed from the site. Erosion control containment and berming of this area will be provided for pollutant containment and sheeting provided for coverage or lining if applicable. ,~ ~~ DEL'S FARM SUPPLY 03.13.07 PAGE 15 ~' ~' .~ IV. STORMWATER MAINTENANCE PLAN DEL'S FARM SUPPLY REVISED MARCH 13, 2007 DEL'S FARM SUPPLY 03.13.07 PAGE 16 TABLE OF CONTENTS 1, STORMWATER FACILITY MAINTENANCE GUIDE ...............................................................:........ 18 INTRODUCTION ....................:....................................................................................................... 18 What is Stormwater Runoff? ...............................................................................:..................... 18 What is a Storm Drain System and how does it Work? ............................................:............... 18 What does Stormwater Runoff have to do with Water Quality? ................................................ 18 Your Stormwater Facility ........................................................................................................... 18 Who is Responsible for Maintaining Stormwater Facilities? ..................................................... How to Use the Stormwater Facility Maintenance Guide ......:................................................... 18 19 Included in This Guide .............................................................................................................. 19 A Regional Approach to Stormwater Management ................:.................................................. 19 YOUR STORMWATER FACILITIES ..........................................:................................................... 19 FACILITY KEY ...............................................................................................................:................ 19 SITE PLAN ..................................................................................................................................... 20. QUICK LIST .................................................................................................................................... 21 MAINTENANCE CHECKLISTS ...................................................................................................... 22 Ponds .........: ................................................................................:............................................. 23 Catch Basins, Manholes, and Inlets .......................................................................................... 24 Conveyance Pipes, Ditches, and Swales ................................................................................. 25 Grounds and Landscaping .............................:.......................................................................... 26 RESOURCE LISTING .................................................................................................................... 27 II. POLLUTION SOURCE CONTROL PROGRAM ................................................................................ 29 What Are Pollution Source Controls And Why Are They Needed? .......................................... 29 Materials Used And Wastes Generated .................................................................................... 29 Required Actions ....................................................................................................................... 29 DEL'S FARM SUPPLY 03.13.07 PAGE 17 a II. STORMWATER FACILITY MAINTENANCE GUIDE INTRODUCTION What is stormwater Runoff? 1~ When urban and suburban development covers the land with buildings, streets and parking lots, much of 1~ the native topsoil, duff, trees, shrubs and grass are replaced by asphalt and concrete. Rainfall that would have soaked directly into the ground instead stays on the surface as stormwaterrunoff making its way into storm drains (including man-made pipes, ditches, or Swale networks), stormwater ponds, surface and groundwater, and eventually to Puget Sound. What is a Storm Drain System and how does it Work? The storm drain system for most developments includes measures to carry, store, cleanse, and release the stormwater. Components work together to reduce the impacts of development on the environment. Impacts can include flooding which results in property damage and blocked emergency routes, erosion which can cause damage to salmon spawning habitat, and pollution which harms fish and/or drinking water supplies. The storm drain system provides a safe method to carry stormwater to the treatment and storage area. Swales and ponds filter pollutants from the stormwater by physically settling out particles, chemically binding pollutants to pond sediments, and biologically converting pollutants to less harmful compounds. Ponds also store treated water, releasing it gradually to a nearby stream or to groundwater. What does stormwater Runoff have to do with Water Quality? stormwater runoff must be treated because it carries litter, oil, gasoline, fertilizers, pesticides, pet wastes, sediments, and anything else that can float, dissolve or be swept along by moving water. Left untreated, polluted stormwater can reach nearby waterways where it can harm and even kill aquatic life. It can also pollute groundwater to the extent that it requires treatment before it is suitable for drinking. Nationally, stormwater is recognized as a major threat to water quality. Remember to keep everything out of stormwater systems except the rainwater they are designed to collect. Your stormwater Facility Different types of ponds are designed for different purposes. For example, wet ponds primarily provide treatment of stormwater. Dry ponds or infiltration ponds are designed to provide storage for stormwater and allow for its gradual release downstream or into the ground. Who is Responsible for Maintaining stormwater Facilities? All stormwater facilities require maintenance. Regular maintenance ensures proper functioning and preserves visual appeal. This stormwater Facility Maintenance Guide was designed to explain how stormwater facilities work and provide user-friendly, straightforward guidance on facility maintenance. You are responsible for regularly maintaining privately owned ponds, catch basins, pipes and other drainage facilities on your property. stormwater facilities located in public rights-0f-way are maintained by local governments. DEL'S FARM SUPPLY 03.13.07 PAGE 18 ~'I How to Use the Stormwater Facility Maintenance Guide This Maintenance Guide includes a Site Plan specific to your development and a Facility Key that identifies the private stormwater facilities you are responsible for maintaining. A "Quick List' of maintenance activities has also been included to help you identify the more routine needs of your facility. Included in This Guide ® ^ Comprehensive Maintenance Checklists that provide specific details on required maintenance. ^ Pollution Prevention Tips that list ways to protect water quality and keep storm drain systems functioning smoothly. ^ Resources to provide more information and technical assistance. A Regional Approach to Stormwater Management ® The Cities of Lacey, Olympia and Tumwater together with Thurston County are taking steps to educate and involve area residents in water quality issues and stormwater management. Stormwater runoff is a widespread cause of water quality impairment and stream degradation. The jurisdictions are working together with residents, businesses, community groups and schools to address this problem. This guide focuses on providing information on ways that you can reduce stormwater impacts through pollution prevention and proper facility maintenance. YOUR STORMWATER FACILITIES This section consists of two parts that are to be used together: the Facility Key and the Site Plan. Review the site plan and identify the numbers denoting a feature of the system. Then check the facility key for the feature type and checklist name. ^ FACILITY KEY The stormwater facility in your neighborhood is comprised of the following elements: Type of Feature .i~ Checklist Name Location on Site .Plan Ponds 1 Catch Basins, Manholes, and Inlets 2 Conveyance Pipes, Ditches, and Swales 3 Grounds and Landscaping 4 DEL'S FARM SUPPLY 03.13.07 PAGE 19 »LIS FARM SUPPLY 06 i 6 BALD HILL RD SE YELM, WA. 98597 SW i I4, OF THE NEW i /4, OF SECTION 29, TOWNSHIP i 7 N., RANGE 2 E., W.M. 30 15 0 30 fi0 1 SCALE: 1" a 30' INAI _ _ r YELM A ~~~• ~`~~ ~ ~ 5 ~ ~ VERTICAL DATUM ~_ _ _ _ NB931TJ E _ _ _ _ _ - _ _ _ _ _ - - __ _ IeeR + "•~Sy '~. ~Jxresr30'E THURBTONCOUNTY I I ~• BENCHMARK N0.7B8 AS C 114 . _ _ _ __ __.__ ~ __ ___ ___ _ __ _ ... V + __ ____ UT -, .. -... ~ ~ ... ..,,. _ _ _ _ -._ „__ _ ., '. ECTION 29, T77N, R] _ _-..., -___ _ ..,, -. ., .......... ........ S E r - ~ s.eest3v wBV G "-~ ,.~.~wae.. ;s„ : Suw ELEV=350.91 Y-X--%-X Y .. ~1g ^tr- --' - _ -- EXISTING ORY WELL ~ ~ ~/~ w.r ~ ~ ~ /~ I x. .,d^ ! '- ° -' / ~ I 1 E%LSTWG PROPANE TANK ~. ~, ~~,a~ ~ ~ :j I' 33 • °p~l ~I I APPROXIMATE LOCATION hj ~ a n L j I„ 8 Y OF EXISTING ADJACENT y~~~ I~ / 8' m Q f G' "a SEPTIC TANK P ~ '~, ~ I 2 ~ '~' +I '. ~ FL000 PL41N 30.7.0 PROPERTY CORNER NEW VINYL + EXISTING ~'. PER CRY STAFFS I 3t]8.31, 35.00' lT COATED FENCE F ;~ - EDGE OF PAVEMENT I~ y, INTERPRETATION ~ ql fJ ~ ~ / OF CITY FEMA MAPS I '~ ~~ ~I_ \ C IA R '~1 ~ ~P ~,/ I I i pil VV ' `> Os Co I I' '~ ~~' \ \ ' \ s~~` l fi. DEL'S FARM SUPPLY dB3P7p'M [, 8,7055E ~ :~ ~'. - FF 353.70 ~ - S m N uspo '~' I 1 wm - _ _. . ~~- _.-. - Jr PLANTERS W/ ~ :. .: __ ~` _____ __ ______________________1 _~ -_ \; ~ / -~-- -,.- - - -------- T\ ~ , ,~\\ \ S.T EP. TANK (r TREES (TYP) ,~ :~. ~ a m n m a a >t- a a w ~ _ \ } ~ s ~.. ~ I I ' ..z '. ~ A-9 ~' 'rN STM 1//'. / \~ \~\ \•. d\ az ~~. n SCREENED I • \ s. w : . s wnm• M \ + e~ s APPRDXMATE LOCATION OUMPSTER - r~ \ \ \y4 \ I '' ~ AREA 13'X1S i \• tlf E%ISTMO SEPTIC TANK ",{HAIN LINK / I ' a LDADINGME/i„....Fp,E XYDRANT SUMP PUMP ~~, \ ,. d" :.\ \\ \ ` ~ ~ _ WI BOLLARDS. - - ... ~,/ ~ - \ \ \, \~ .. T1.. T e e p iu n +i u ~ .. ONO TM 3/8 I~ y - \. • l,/ f~ .4TI?PR'IN. 7'rtTy.,:RL2d.EA. T?r'. 'T52!'Tr.112!@- ^ / I \ \ \ ~ + 1B N n +a +q / / i EXSTING DOOR ~ -I I II 6TOAAGE \~Q•~ \~5 y 5 7 17 4,3205E jD I Q• ~~~ '. \ \_\ ~ ~ COATED FENCE a ! ~ 4Y.~'d N$ / - ~P \ - \ ~ / , ~ ~ : ~~ I CENTERLINE OF CREEK `' / ~ •~ 4,~\ 4,/' -.; SETBACK FROM / _ \ ` \ 'q ~ /~. /~ ~~ FLOOD PLAIN ~~-\ \ir \,~~ A' ao ~EXLSTING WELL I ~s.,~ ~c ~\ ~ n. 70 BE REMOVED ELEVATION 717.0 I ,~ w /'. I ~S \ ~ ~~ / / SERVICE LINE / EINTERSECTI \\ ~ \ ~' \ ~'\ / ~ S EXISTING PROPANE TANK / I I E%ISTWG 3+67.]0 ":~. b \ N ' \ \-\. ~\ / A"PAINTED ' I I FORCE,MIN \. ~ \\ ~ /. WHRE STRIPE ~~~~_ _ _ _ _ _ _ _ / ., ~ \~ ~~\'~ \ ~ ' • ~'~, 50 F00T '~ THICKENED 1 I p \ ~ \ / PROPOSED/' \ ~, '~,S(1~'~ }SLIDE GATE - P ~ w`'fB~ ASPHALTCURS ~~ I FORCEMAIN \\ y, `x \ \ 1 HIGH WATER LWE / ~~~?~(y`+``~ V ~A\V MEASURED O3A2A8 SITE DATA \ ~ \ v ~ ~, ~ 1 I ADDRESS 10616 BALD HILL RD SE ~ WATER ' / ° / PARCEL NO. 64303200100 r \ \~•\ ',\;\\ METERS ' ZONING COMMERCIAL (C 1), \ \ ~ ~ \ \ _ a' TYae II - / I CHAPTER 17.26 YMC EXLSn^G TREE ~~~, \ +~\~ \ \ LANDSCAPE rD,'. 1 TO BE REMOVED ~T"\ \`4, .\ / I w SETBACKS ~,'\ \,.d ~' `.~ 1\ ~~~ - REAR YARD ~~.' \' ~ ~ ` \ ~ I / I e'TYPE IIIANDSCAPE \ \• - ~ PARKING CALCULATIONS \ `• \ `~ '\\\ / / I ~ 1 STALL FOR EVERY 2506E OF RETAIL ~ ~~ `~V v • Av ~ v 879.70, 13' e~ \ y ~ \ 'r~ ~ ORDINARY HIGH 4320 SF1250 SF=33 REQUIRED STALLS New SD FOOT \ \ \ ~ \ ~ \ ,d \ / WJ~TER MARK : DRIVEWAY \ \5'., \ \ \ '. '. . RETAIL 8205 SF \ \ y ~\ END FRONTAGE IMPROVEMENTS I / I I STORAGE 4320 SF ~ ~\~\ - "\ AT STA 7?3D I NEW VIN ~~ ~\ \ \ / / Y , _w TOTAL SITE ARE4 6.15 ACRE6 coA7ED FENCEv v ;- ~ ~ ~ ~ ~ ~` v ' -~ ~ ~ I ~, I / ~ V ~ ~ ~.. EASEMENT \ • ~~~~. / \~ \~ ~''~ BPA TRANSMISSIONTOWER \ ~\ \\ MONUMENT LINE REFERENCE \ \ ~ ~ `~ '~~\~ \ \\ EARTH QUANTITY I RIONTOF WAT PLAN BALD XIUS gpA0,5cORNERSro TACCRM R,VL uxES, NOTES; iQ EXISTING ACCESS TO BE MAINTAINED \ \ ~ 'Xr / I I ixUR6TON CDUNTr DEPARMENT aF ROAD6 AND iMNSpGTATION UNTIL NEW ACCESS IS COMPLETED \ \~~\ '~\ \ \ \\: '~ I (for P6Fnlt Onry) I APPft0VE08EP1EMBE0.16, 1003. \ •, AND ACCEPTED BY CITY OFYEIM \ '. .\ ,~ .\\ \t\, ~ I ' EXISTING UTILITY NOTE: p EXISTING FENCE SHALL NOT BE REMOVED \ h \ \ \~ „" r CUT 50O OY I I \.. .\ EXISTING UTILITY LOCATIONS SHOWN ARE FROM VARIOUS UNTIL NEW FENCE OR OTHER SECURRY \ "~P\\\ ^ CONNECT TO /-' PILL 7S0 Cy I RECORDS. CONTRACTOR TO FIELD VERIFY ALL UTILITIES PRIOR MEASURES ARE PROVIDED. \ ~.~ \ \ -"~ \EXISTING FENCE ''. TO CONSTRUCTION.'CALL BEFORE YOU DIG tA00<245555, 4B 70 REMOVE EXISTING STRIPING PRIOR \ '. ~ \\ ~ ~,^\\ \ : I HOURS W ADVANCE. \ \ \ \ '~ TO PAINTING AND PARKING. COORDINATE `--__ ___ ~ / TIMING WITH OWNER \ ~ ~~~ ~__ \ _ ___ __, ~ _ ___________________ I - THISDRAWINGDOESNOTREPRESENTARECOR~D000MENT, CAII RANGY 380-701-7033 \~ ~~~ \ \ \ - UNLESS CERTIFIED BY HATTON GODAT PANTIER. \ \ - \ ~ ' \ \ \ /~a ~ ANV ALTERATIONSTOTHE DESIGN SHOWN HEREONMUSTBE \\ .\ \\ y~ 1 ~) REVIEWEDAND APPROVED BV HATTON GODAT PANTIER. \ ~\ ~ \ ~~~ ~ '~ _~ \~~~~ ~ '~ ~~ I I~. I' ^ CONCflETE MOXUMENi x-3 NEW 9IREETL1GNf EX FlRE HYDRANT ®JB ELECTRICAL JUNCDON BOX EX WATER METER OBO EIECi.BEAVX:E pISCONNECf EX WATER VALVE ® ELECTRIGLTRARSFORMEft _ EX SANITARY SEWED MANHOLE EX SANITARY 9EWER CLEAN OUT G NEW 9EWFRMM'HI%E EXSroRM DRAIN MANXOLE ' NEW CLFANgR Ex GiCx vs3J ~ NEweroRM MWxCLE EX POLEANCXOR C7 NEW GTCNBA5IN EXCUY POLE ^ NEW WATERMFLER EXPOWER POLE M NEW BLOVAFFASMBLY E%fiERYICEPOLE ^ NEW NYORAHi ;. Ex POWFft VWLT E%G6MEIER •' NEW VALVE E%G6VALVE ••+ NEWVAIVEWI REDUCER EX TELECOMNUNICTION UiILIiIES NEw WATERAWN EX TELEPHONE PEOESiAI >o-NEW FGCEMVN EXNNC110N BOx -1->-NEINORAyRY SSVrp F%SIGN -i -s NEW 810RM DRAINAGE Ex TRAFFIC 6IGNAL POLE w~.~ NEW ft(LK WALL EX 5111EETt1GNi i® EXISTING CONTW0.9, MINOR E%POWER METER _~®-EIIISTING CONTOVftS,AWCiI ;- EX MAILBOx EX POST ~®-FINISXED CONf0UR8, MINgI & EX GRfiDNI1E POST ~°-FlNBHED CONTOURS, MAJOR EX CXAINLINN FENCE PAINT TINE E%UNDERGROUND POVfcR - EX UNpERGPOUNO iELEPONE ^NEW ASPHALT - EX UNDERGROUND GAS BONNENLLE POWER ~ AONINISTMTION EX ASPHALT PONER EA6EMENT SHEET INDEX 1) COVER 1 SITE PLAN 2) EROSION CONTROL 3) DEMO PLAN 4) GRADING 8 DRAINAGE PLAN 5) BALD HILLS ROAD FRONTAGE 6) STREET DETAILS 7) ON.SITE DETAILS 8) OVERALL UTILITY PLAN 9) SEWER PLAN 8 PROFILE 10) S.T.E.P. DETAILS 11) WATER PLAN 8 PROFILE 12) WATER DETAILS 13) STREET LIGHTING PLAN • DETAILS ;" A ~@y xmrp sGlE x.,6 e~,xe~ a a ~~~ ~~ „~ ~~ ~~ VICINITY MAP NTS 0 0 0 O a ^ k 01 fJ b ~~~~~~ 1~~~~~1 tiNDyq ~4,~ d wnsh~ TT q~1A 5 ~~ Z `"F ~``~inE~'0 ~`~ ~+aa ~ W m Z°3 ~ ~Qp~ ~ LL W 1Y00 >~m E ~ W :~ ~3~ of ~; D a'~LL "g a mW~ n WQa o z3~ QQmtt ~ ~ c Z W Q~'0 ~1 m l,lzm° ~ 2 * W Q W I' I v I H 2 O N W D: J Y. N ~ ~~ ~ =gig Q Q o3 W LL m ~ N ~W ~} Wo Q AGENCY N0.5PROSOBTWL SHEET: ? OFL E IdgN05-0OONS-055 INDEX'. OS-0SSc3Ydwg • JOB: A5-055 1 1 J QUICK LIST The following is an abbreviated checklist of the most common types of maintenance required. Please go over this checklist after heavy rains. The list represents minimum maintenance to be performed and should be completed in conjunction with the other checklists for an effective maintenance program. ^ Inspect catch basin grates to see that they are not clogged or broken. Remove twigs, leaves, or other blockages. Contact the local jurisdiction to replace the grate if it is broken. ^ Inspect inlet and outlet pipes for blockages. Clear all blockages. ^ Inspect filter strip, swale and pond walls for erosion or caved in areas. ^ Inspect riprap (rocks) at the inlets and outlets of culverts and other pipes. If they are silted in or eroded away, replace them. DEL'S FARM SUPPLY 03.13.07 PAGE 21 MAINTENANCE CHECKLISTS The Maintenance Checklists in this packet are for your use when inspecting the stormwater facilities on your property. This packet has been customized so that only the checklists for your facilities are .included. If.you feel you are missing a checklist, or you have additional facilities not identified or addressed in this packet, please contact your local jurisdiction. The checklists are in tabular format for ease of use. Each describes the area to inspect, inspection frequency, what to look for, and what action to take. A log sheet is included toward the end of the chapter to help you track maintenance of your storm drainage system. Although it is not intended for the maintenance survey to involve anything too difficult or strenuous, there are a few tools that will make the job easier and safer including: ^ A flashlight. ^ Along pole or broom handle. ^ Some kind of pry bar or lifting tool for pulling manhole and grate covers. ^ Gloves. A resource list is included in the next chapter. Here you will find the phone numbers of the agencies referred to in the tables, as well as the contractors and consultants who designed and constructed your facilities. SAFETY WARNING: In keeping with OSHA regulations, you should never stick your head or any part of your body into a manhole or other type of confined space. When looking into a manhole or catch basin, stand above it and use the flashlight to help you see. Use a long pole or broom handle to check sediment depths in confined spaces. NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF THE OPEN HOLE. DEL'S FARM SUPPLY 03.13.07 PAGE 22 1 1 1 1 Ponds There are essentially three kinds of ponds: treatment ponds, infiltration ponds, and detention ponds. Although each pond has unique maintenance requirements, there are also many things they have in common. Your facility has both infiltration and wet ponds. INSPECTION FREQUENCY. LOOK FOR ACTION AREA Entire Pond Quarterly Yard waste such as grass clippings Remove trash and debris and dispose of properly. and branches in basin; presence of glass, plastic, metal, foam, or coated paper. Entire Pond Quarterly Vegetation that may constitute a Remove invasive or noxious vegetation. Do not public hazard, e.g., tansy ragwort, spray chemicals on vegetation without obtaining poison oak, stinging nettles, guidance from WSU Cooperative Extension and devilsclub. a royal from C~ or Coun Entire Pond Quarterly Presence of chemicals such as First, attempt to locate source of pollution; then call natural gas, oil, and gasoline, Moderate Risk Waste program at Thurston County noxious odor, or sludge. Environmental Heath to report the hazard. Entire Pond Quarterly Sparse, weedy, or overgrown grass Grassy ponds: selectively thatch, aerate, and re- in grassy (dry~nfitration) ponds; seed ponds. Grass should be kept less than 8 presence of invasive species or inches high. Wet ponds: hand-plant nursery- sparse growth of plants in wet grown wetland plants in bare areas. Contact WSU ponds. Cooperative Extension for guidance on invasive species. Pond bottoms should have un'rform dense coverage of desired plant species. Entin; Pond Quarterly Evidence of rodent holes ff facility Destroy rodents and repair dam or berm. Contact is a dam or berm. Water should Thurston County Health Department for guidance. not flow through rodent holes. Entire Pond Quarterly Nuisance insects such as wasps, Destroy or remove insects. Contact WSU hornets or mosquitoes that may Cooperative Extension for guidance. interfere with maintenance. Entire Pond Annually Confirmation that trees are not Prune tree limbs to allow for maintenance. Some interfering with maintenance (i.e., trees may be cut mowing, sift removal, or access.) Inlet Annually Confirmation that the riprap under Replace rocks and/or remove sediment. the inlet pipe is intact and that no native soil is exposed. Also, look for accumulations of sediment greater than half the height of the rocks. Outlet Quarterly Afree-flowing overflow that is dear Replace riprap ff missing. Remove trash or debris of debris. and dispose of proper) . Side Slopes Annually Signs of erosion around inlets and Attempt to determine the cause of erosion and outlets. Inspect berms for signs of repair it. Stabilize slopes by reinforcing with rods, sliding or settling. Take action "rf planting grass, or compacting soil. Contact WSU eroded damage is over 2 inches Cooperative Extension for guidance on slope deep and where there is potential reinforcement. for continued erosion. Storage Area Annually Sediment build-up on pond bottom. Remove the sediment and re-seed the pond if A buried or partially buried outlet necessary to improve infiltration and control structure or very slow infiltration erosion. rate may indicate significant sediment deposits. Dikes Annually Significant settling of any part of Build dike bads to the original elevation. dike. Emergency Annually Intact riprap protective area. Repair Replace rocks so all native soil is coven:d. Overflow/Spillwa 'rf any native soil is exposed. Trench Drain Quarterly Confirmation that the grate is clear Remove debris from grate, clean drain. of debris and that the drain is not plugged. DEL'S FARM SUPPLY 03.13.07 PAGE 23 1 ' Catch Basins, Manholes, and Inlets These structures are typically located in the streets and public rights-of-way. Local jurisdictions are responsible for routine maintenance of the pipes and catch basins in rights-of-way, while you are responsible for keeping the grates clear of debris in all areas as well as pipes and catch basins in private areas. INSPECTION FREQUENCY LOOK FOR ACTION AREA Catch basin During and after Accumulation of trash or debris in front of Remove blocking trash or debris with a opening major storms catch basin opening that prevents water rake and clean off the grate. from flowing in. Catch basin Quarterly Sediment or debris in the basin. No more Remove debris from catch basin. than hall the depth from the bottom of the pipe to the bottom of the basin should be allowed to accumulate. Use a long stidk or broom handle to poke into sediment and determine depth. Inlet and outlet Quarterly Trash or debris in the pipes that has Remove trash or debris from inlet and pipes exceeded 1/5 of their height Ensure there outlet pipes. are not tree roots or other vegetation growing in the pipes. Inlet and outlet Annually Cracks wider than '/: inch and longer than Repair cracks or replace the joints. pipe joints 12-inches at the joint of any inlet or outlet pipe. Also check for evidence of sediment entering the catch basin through cracks. Grate Quarterly Cracks longer than 2 inches or multiple Replace grate 'rf necessary. cracks. Frame Quarterly Confirmation that the frame is sitting flush on Repair or replace the frame so it is flush top of the concrete structure (slab). A with the slab. separation of more than'/. inch between the frame and the slab should be corrected. Catch basin Annually Cracks wider than % inch and longer than 3 Replace or repair the basin. Contact a feet. Also check for any evidence of professional engineer for evaluation. sediment entering the catch basin through cracks. Determine whether or not the structure is sound. Catch basin Quarterly Chemicals such as natural gas, oil, and Clean out catch basin. Contact your gasoline have may have entered the catch local jurisdiction or Thurston County basin. Check for noxious odor or oily Environmental Health if you detect a sludge. color, odor, or oil sludge. Oil/water Quarterly Significant sludge, oil, grease, or scum layer Remove the catch basin lid and skim off separator covering all or most of the water surface. oil layer. Pour oil into a disposable (downtumed container, seal container, wrap securely elbow or °T° in in newspaper, and place in trash. Water catch basin) surface should be Gear of oil layer. Pipe elbow Quarterly Damage to top or bottom of pipe; determine If pipe is broken, replace pipe in whether pipe is plumb. accordance with approved plans on file with your local jurisdiction. DEL'S FARM SUPPLY 03.13.07 PAGE 24 Conveyance Pipes, Ditches, and Swales 1NSPECTION FREQUENCY LOOK FOR ACTION '' AREA Pipes Annually Confirmation that accumulated sediment has Clean pipes of all sediment and not exceeded 20% of the diameter of the pipe debris. Remove all vegetation so and that vegetation has not reduced free that water flows freely through movement of water through pipes. Ensure that pipes. Repair or replace pipe as the protedive coating is not damaged and necessary. rusted. Dents should not sign~cantly impede flow. Pipe should not have major cracks or tears allowin water to leak out. Open ditches Quarterly Yard waste or litter in the ditch. Remove trash and debris and dispose of proper) . Open ditches Annually Confirmation that accumulated sediment has Clean ditch of all sediment and not exceeded 20% of the depth of the ditch. debris. Open ditches & Annually Vegetation (e.g., weedy shrubs or saplings) Clear blocking vegetation so that Swales that reduces the free movement of water water flows freely through ditches. through ditches or swales. Grassy vegetation should be left alone. Open ditches ~ Quarterly Signs of erosion. Insped slopes for signs of Eliminate causes of erosion. Swales sloughing or settling. Adion is needed where Stabilize slopes by using eroded damage is over 2 inches deep and appropriate erosion control where potential for continued erosion exists. measures (e.g., reinforce with rock, plant grass, compad soil.) Open ditches ~ Annually Adequate rock placement in splash pad, chedk Replace rocks to design standard. Swales dam or lining. Native soil should not be visible. Swales Quarterly Adequate grass coverage. Take adion 'rf Aerate soils, reseed and mulch coverage is sparse and weedy, or areas are bare areas. Keep grass less than 8 overgrown with woody vegetation. inches high. Remove woody growth,regrade, and reseed as necessa . Swales Quarterly Confirmation that Swale has not been filled in If possible, speak with homeowner or blocked by strudures, shrubbery, etc. and request that the swale area be restored. Swales Annually Standing water in swale or very slow flow A survey may be needed to verify velocity. Stagnation. grades. Grades should be between 1-5%. DEL'S FARM SUPPLY 03.13.07 PAGE 25 Grounds and Landscaping INSPECTION. , FREQUENCY LOOK FOR ACTION AREA Landscaped Quarterly Uncontrolled weed growth in landscaped If possible, pull weeds by hand to avoid Areas areas. usin chemical weed controls. Landscaped Quarterly Presence of poison ivy or other poisonous Remove poisonous vegetation or Areas vegetation or insect nests. insect nests. Landscaped Quarterly Yard waste or litter. Remove and dispose of properly. Areas Landscaped Quarterly Noticeably visible rills in landscaped areas. Identify the causes of erosion and take Areas steps to slow down or disperse the water. Fill in contour, seed area. Trees and Annually Split, broken or otherwise damaged tree Trim trees and shrubs to restore shrubs parts and shrubs. shape. Replace severely damaged trees and shrubs. Trees and Annually Blown down or knocked over trees or shrubs. Replant trees or shrubs, inspecting for shrubs injury to stem or roots. Replace if severe) damaged. Trees and Annually Exposed roots, inadequate support, severe Place stakes and rubber-coated ties Shrubs leaning. around young trees/shrubs for support. DEL'S FARM SUPPLY 03.13.07 PAGE 26 1 1 1 1 1 J RESOURCE LISTING If you suspect a problem exists, please contact your local jurisdiction at one of the numbers below and ask for Technical Assistance. Contact Numbers: Yelm Public Works (360) 458-3244 WSU Cooperative Extension (360) 786-5445 Engineer's Information: HATTON GODAT PANTIER 1840 Barnes Blvd SW Tumwater, WA 98512 (360) 943 -1599 DEL'S FARM SUPPLY 03.13.07 PAGE 27 LOG SHEET Use log sheets to track maintenance checks and what items, if any, are repaired or altered. The completed sheets will serve as a record of maintenance activity and will provide valuable information about how your facilities are operating. Log sheets should be kept in a dry, readily accessible place. INSPECTION DATE: PERFORMED BY: PHONE NUMBER: ADDRESS: POSITION ON HOA: CITY, ST, ZIP: •: • s• • ~ ~ • ~ • • DEL'S FARM SUPPLY 03.13.07 PAGE 28 ^ III. POLLUTION SOURCE CONTROL PROGRAM What Are Pollution Source Controls and Why Are They Needed? Pollution source controls are actions taken by a person or business to reduce the amount of pollution reaching surface and ground waters. Controls, also called "best management practices° (BMPs) include: ^ Altering the activity (e.g., substitute non-toxic products, recycle used oil, route floor drains to sanitary sewer rather than storm sewer). ^ Enclosing or covering the activity (e.g., building a roof). ^ Segregating the activity (e.g., diverting runoff away from an area that is contaminated). ^ Routing runoff from the activity to a treatment alternative (e.g., a wastewater treatment facility, sanitary sewer, or stormwater treatment area). Pollution source controls are needed because of the contamination found in runoff from commercial areas and the effect of this contamination on aquatic life and human health. Research on urban runoff in the Puget Sound area and elsewhere has found oil and grease, nutrients, organic substances, toxic metals, bacteria, viruses, and sediments at unacceptable levels. Effects of contaminated runoff include closure of shellfish harvesting areas and swimming areas, mortality of young fish and other aquatic organisms, tumors on fish, and impairment of fish reproduction. Materials Used and Wastes Generated Of particular concern are drives and parking areas. Because of heavy vehicle usage, the concentration of oil and grease in stormwater may exceed the Ecology guidelines of 10 mg/1. Although there are no local data to confirm this view, limited research in the San Francisco Bay area found the mean concentration of oil and grease in stormwater to exceed 10 mg/1. Required Actions The following actions shall be taken to ensure that pollution generated on site shall be minimized: 1. Warning signs (e.g., "Dump No Waste -Drains to Stream") shall be painted or embossed on or adjacent to all storm drain inlets. They shall be repainted as needed. Materials needed to undertake this task can be purchased or may be available from the Public Involvement Coordinator for the Department of Public Works. 2. Sediment removed from basins, ponds, and swales shall be disposed of in a proper manner. Contact the local governing jurisdiction for inspection prior to completing this task. 3. No activities shall be conducted on site that are likely to result in short-term, highly concentrated discharge of pollution to the stormwater system. Such activities may include, but are not limited to, heavy vehicle maintenance, and cleaning of equipment used in the periodic maintenance of buildings and paved surfaces. 4. Use of pesticides and fertilizers shall be minimized. 5. Do not dump paint, solvents, oils, or other such substances, including landscape waste, into storm drains or ponds. DEL'S FARM SUPPLY 03.13.07 PAGE 29 APPENDIX A -Site Plan and Soil Logs DEL'S FARM SUPPLY 03.13.07 PAGE 30 ~~LIS FARM SUPPLY PROPERTY CORNERI ncW Vlrvn N3831, 15.00' LT COATED FENCE ~' ~\ ~.~~''~\ \ -- - - " ~ A ?' ~ ~ 6.T,EP.TANK ~\ } ~\ \\~~ D o \ \ \ \ ~ a \ . +A u ~ t~° A \. ~ .~ ;~ \ / ~ \ ~ \ . , ~ ~ \ \ I k o ? ~ ~' II \ ' I ~ \ ~ \ \ 5 e0 ,~` II` L1'Ilc9 M'IT'"JN~ r 353 "'~ ' a 7 D a O ~~'~ ~~ _ i a a sw i/4, ~F THE NEW i /tL, OF SECTION 29, TOWNSHo IP i 7 N., RANGE 2 E., W.M. 30 15 0 30 50 1 SCALE. 1"=3P /~/ I ' Jas "~,,.3rs ..., .346.,. VERTICAL DATUM I emA NVGD 19 w+ THURSTON COUNtt ., „... .~' .. .. .. n n I I wj ~ BENCHMARK N0.7B8 __ __ __ 1 ___ _ ~ __ __.___ _ ___________ _I S APW , - ~_._ ..,...... - 1M Cli ~.; '~ .... ...... .. .... -- ~ ""'~~ ~4$ ECTION 29, T17N, R2E '~. _, ..T.. .. ~ '. ..~.. ,_.~wm.. .~, 111M ... ~ ° ... ELEY:350.81 ~Y-XT-X-X k-X PING ORY WELL / vlu 7 ' r.~ ~ x ,N5 ~ ~ ~' ~ '" J ~ i ~ l l EXISTING PROPANE TANK / / 7 APPROXIMATE LOCATION rII~ ~ I OF EXISTING ADJACENT ~ 1~ / I I SEPTIC TANK ~~' DEL'S FARM SUPPLY ~I 8,205 SF ~- FF 353,70 ~ 0 ". PLANTERS W! TRF NOTro bGIE P - / I '~ ~ FLOOD PLAIN 9U.0 I I EXISTING'. I ' PERCITY 9TAFF5 I EDGE DF PAVEMENT ~ INTERPRETATION I II ~~ / + I OF CRY FEMA MAPS I I I I / I w s ~ ~ ~ Is.GN _ - --- D ---- m _ _ 0 _ - =-- - -i --- / I I -----------------~--I -- --- - -~ E9 RYPi ~ a m r m~ a m m- v ~S 1 ~ s<uILLN.v11. NNJ: ~JtWuSLWeNIPt%N~ sGa:n,pR~uu l 8! /` ``~ .! '8 ~ M I ~l ~~ ~ ~. WET POND Jy v' BTM 3K ~ !~ > z n GCREENED - ( 'wn A ~ , '. SR95Ta0'M - ~' APPROXIMATE LOCATION ,f~ DUMPSTER '~ 4 ~ s AREA 12`x15' ," I - OF EXLSTING SEPTIC TANK ;QHAIN LWK LDAD930 AREA;. YliSLAT9 SUMP PUMP 3 "' y FOTF, HYDRANT WIBOL3AR09 ~~' °~,. .-T~... T A N Q n rJ a t1 ~ /' I .. FILT TM JIB, / OND ~ 4 r ~-~~~~.~,>m-~~.~-~r'x~~raAA o .~ / I '1 Q N v. u rt ~,. ~ n / EXL3TNGDOOR +) fl STORAGE t $ N55 / ~ P. \ \ ti F .r.. 4,3205E .. r Q- / ~ \ ~~ NEWYINYL. / e I .p5 ~/ \ -~ h `~ ~ COATED FENCE y f ~ f / )s:R I L` •~ m / yJ' \ ~ ~ / `4i / \\ K.,• y h # .~ i /•. ~ExlsnNa wsiL ~ . \~ ~ m ~. TO BE REMOVED • '~* ~~ ~ ' ~\~\\ ~,e~ y ~,n~\'~ f / SERVILE LINE / \ \\ \ \ EXISTING PROPANE TANK ' QINTERSECTI \n y \ \ / E%ISTINO N4T.3D ~~~ ~ ~ \ ~, \ / 1"PAINTED / FORCE}WIN .~ \\~ `aAt~~, \ \~ /WHRE STRIPE r, ~.~_ \ `4 / \, ~ ~A•JQ ~~ \ \~ .- 50 FOOT '" THICKENED ' / PROPOSED 4" ~i ~'E9n~'~ \ } ~~940E DATE e; ~" "`A ~fi~ ASPHALT CURB FORCEMAIN ~ ~~ \\ ..\\ ' //// SITE DATA \ ~ ~~ ~." \. \' N ADDRESS 10616 BALD HILL RD SE ~,` WATT ~ ' ~ ° PARCEL N0. 64303200700 ZONING COMMERCIAL (Gi), CHAPTER 17.26 YMC SETBACKS REAR YARD PARKING CALCULATfONS 1 STALL FOR EVERY 2505E OF RETAIL 4320 SF! 250 SF = 33 REDUIRED STALLS RETAIL 6205 SF STORAGE 4320 SF TOTAL SITE AREA 6.75 ACRES \ \ `,~ \ \ \J.. ~P~ ~ ` ~ ~ . ~. \ -- \' ~ METERS ~ 5ttPE 11 l EXSTING TREE \ ~ ~ TO BE RENOVEO \ \ ~ ,~'B\ ~ ~ s 6 7 \ ~\ •\ - \ \ \\~ LANDSCAPE ~0. .`s \r ' ~ S TYPE IILANDSCAPE \\'.\ \ ~\~ ~ \ ~ ~\ -\, .\ sw3 7o :zL ~, ~ 6~ ~\~ \.\~. * \ ' . , NEW 50 FOOT DRNEWAY ~ y \ \ \ ~ . \ ~ a~ \ . \ A \ - \~ \~ VICINITY MAP NTS ~ L 8 t= S2N Gnar.~~ q~ `/ ,. I ~ `' I ;~ I D- )Zu ~~K ~~~a'~ I I ~Zli ..,~~ (,rwwl I. CENTERLINE OF CREEK I SETBACK FROM ' FL00p PLAIN ''~ ELEVATION 343.0 .i ~ (OJ f~ I ~D1 S ~ VW, ~ I I I I II I I ///~~~'''HIGHWATER LWE I~ '. / MEASURED 03-02-0B ~1Y/ I 111// I 1 i~l~~~ I / I aW I ~ I ~ i j. ORDINARY HIGH MATER MARK ~ ~ ~ END FRpNTAOE IMPROY6MENTS I ~\ ~ ~~~,~ `_ ~~\ \ AT STA 7!00 I NEW VINYL- ~ V A ~ - V A COATED FENCE\ ~ \~~,~,". \ ' -h I MONUMENT LINE REFERENCE RICNTOP VMrPUN&V.O HILIb ROA-,SWRNER6roiACOM1 RNl LINES, TNURSTON COUNttDEPARiMENTOF ROADS AND IIUNSPORTAnON APPROYEp SEPTEMBER 18,1031. EXISTING UTILITY NOTE: E%ISTING UTILffY LOCATIONS SHOWN ARE FROM VARIOUS RECORDS. CONTRACTOR TO FIELD VERIFY ALL UTIDTIES PRIOR TO CONSTRUCTION. "CALL BEFORE YOU DIG 1A0D424S555, 4B HOURS IN ADVANCE. THIS DRAWING DOES NOT REPRESENT A RECORD DOCUMENT, JNLESS CERTIFIED BV HATTON GLOAT PANTIER. 0.NY ALTERATIONS TO THE DESIGN SHOWN HEREON MUST BE REVIEWED ANO APPROVED BY HATTON GLOAT PANTIER. \ ~ ~\, ~ ~` ~~ EASEMENT ~ \ ;'. 7.m.ee, a m' LT ~ \ ' y ~ \ \ \ ` ~': ~~~~ NOTES: 1Q EX6TWOACCE53 TD BE MAINTAINED ~ UNTIL NEW ACCESS LS COMPIETEp \ ~~ AND ACCEPTED BY CITY OF YELM \ ~~, , h~'\\ © EXISTING FENLESHALLNOT BE REMOVED \ \ \,\ UNTIL NEW FENCE OR OTHER SECURffY ~~ MEASURES ARE PROVIDED. \ ~ ~ \\ 3Q REMOVE EXISTING STRIPING PRI00. V ~. ~ TO PAINTING ANOPARKLNG, COORDINATE TIMING WITH OWNER CALL RANGY 3 8 0.701-73 3 9 " `. I i 1 1 \ 'i'~~~ . ~~BPA TRANSMI59IONTOWER '~. ~I / I II I \~ ' EARTH QUANTITY I \, ~' I (for permit Dory) I. I I. v,t, . ~~ 1 , \ ~ y \ ~_- \~- i. CUT BOD Cy I I I \ / FILL 750 cry ~~. \ CONNECT TO .~ \\XISTINO FENCE '., \ ~ I \ \ ,~ v \ \ r °`~ \ ~ ~> ; \ \ \ ~ \ \ y~ A ) `) ~~ ~ Ll I - I 0 0 s °a 0 m • F B OWJCRETE MONUMENT ~'^ NEW STREET DGXf EX FlRE XiT1PNR ®JB ELECTNIGLJUXCnON EO% v E%WAiER NE1ER ^S9 EIECf.SERVX:E OISCONHECT E%WAIER VALVE ® EfECIRICLLTRANSFOAMEA . E%SAXITARr SEWERMANHOLE EX bANITARY bEWER CIFALJ OIIT D NEWSEN,EA AIANHIXE EI bTORM DRAJN MANHOLE ~ NEWCLEANgR .. EX CASCX BASIH • NFNSTOAM MANHOLE EX POLE ANOXpR ~ NFN GTCX9491N EX GUY POLE ^ NEWWATFAMETER EX POwENPoU «. xEw elrnwPFAS~MeLr ~ EX SERNCE POLE ^ NEW HYDRANT E%POVlERVAAT E%GA6 METER ~ NEWVALYE EX GAS VALVE r NEW VALVE WI REWCEA EXTELECOMMUNICSIWl UTIIIIEb NEW WATERMAW EX IELEPXONE PEpESTAL -se- NEW PGLCEMVN -. Ez.uxcnox eoX -~~xEWGpAyITY35<yp EXSIGN -~~ NEWSTORM DRAINAGE 0 EX IRAPFIC SIGNAL POLE o.=.o NEW ROCK WALL a3 E%51XEET DGM ,m~ E%ISTING CONTWRS, MINOR E%POVJER MEIEfl ,o EXISTING WNIWRS, MAJOR ExxAILSOX E%POSf ~m~~'MXEp CONTOURS, MINOA EXC/,RSONLIE POST ~m~FlNRHEp CONTOURS, MAJOR E%CNNNLINKFENCE PAINTLINE ' E%UNpERCR0UN0 POV.'-R E%UNDERCROUNp TEIEPONE ^NEW ASPHALT -' E%UNDERGROUNO CAb ~ ~BONNEVILLE PoWER Aoxlxisnunox EXASPHLLr ~ POVJER EASEMENT s~~l ~ SHEET INDEX 1) COVER I SITE PLAN 2) EROSION CONTROL 3) DEMO PLAN 4) GRADING 8 DRAINAGE PLAN 5) BALD HILLS ROAD FRONTAGE 6) STREET DETAILS 7) ONSITE DETAILS 8) OVERALL UTILITY PLAN 9) SEWER PLAN 8 PROFILE 70) S.T.E.P. DETAILS 11) WATER PLAN 8 PROFILE 12) WATER DETAILS 13) STREET LIGHTING PLAN -DETAILS N E F 0 r m O > W Z m o 0 ]4193 `C I`Si IOWL Ee W z m m Z°3 m Q>m ~ a N loo ~W~ E ~' WQ.. $ ]~~ a Z ~ ~ D ,"! <mWm 4 23a x Q~m t Z ~ miDo~' 0 m ~zm m ~W F z 2 0 N W C J a aN ~ ~m IQ ~ '~ g Q °3w LL m W m (n ~ } W~ 0 AGENCY NO.SPRdScen-'n. SHEET' ~ OF 1] E:I3SN05-000J05455 INDEX: D5-055CGVMJ9 • JOB: 05-056 SOIL SURVEY OF THURSTON COUNTY, WASHINGTON -SHEET NUMBER 25 ~~.__,__ - .I ~ ., ('!hr'- '. ~ L ~ Jo[ns insM, shret JU) _ '. c ~~ ~ I _I \~ .~ 111 ~ ~~`,~ ~V ~~j 110 ' -~ 75 y ~~ ~',~ ~ ~ ~ ~ ~~~~~ ~ ~~ ~`n ~b~ ~ ` rig ~~'i ~, ~ `l ~ ~ o- t ~~J s t ~ ~, ~ Its, ~'\~ ~ ~ u3 t~ 1 1 ~~ 1.3' , ~ a ~ ~ ~ \ \ , ~ ~ ~ \ 1 ~~~ , .~ r ~, i f _a uo 'jai t~v ~ \~~ ~ ~ ~ ~ ~ ~ 1 ~. ~~ ~% ~~ r,,~. ~~--v ~`~-. '~~ A :~ >>3 ,I~ ~ Cat ~,a , _ ~, ._~ ~ ~ 'z~2~'~ ~' ~, ~'~~_~'~ r.- - _ 1 ~, ~4~ ~~ ~ p ~"~; .: _ : ~ ~, ~ 7a c\~' ~ ~~ ~ ~~~' ~ ~ c `~ _ .___ _ . a ~~ ~ VVV~~~ -` _ .~E ,~Ft A \ Umti sheet 3?l. >?., ~ ~ c .: tia ~ I - t ~, ` i:o ~. ~~ ~A 1 ~ ~ ~. - ,_ ~ _~ - ~~_~ _ ~ ~_ j 3 ~1p. A~~ ~. ~~ ~~ 65~ ~~l li0 ' ~ {J, .~ C ~;al ~ 1 ~ ~ ~,~. ,_, ~ A~~ ,. a~a ~ ~.a ~ ~ ~~ - ~ ~ ~~ ~ ~~~ j. 1 1 ~ 1t0 1T2 ~ ~, ~ Aid, 1 1 .~~;~ 11G ~~~ >~~ ~3 ~~ R9 it f~ ~ ~ ~ ~ w ~~'`~ _ f 3' '~' ~ 1, it tii ~ :11~~ ~ l , ` i~'~... ~'4..,- ~ ~~\_ I`. ~~> ~'~. .... ~ _ a~ A\\ '~ y ~~ ~~; r ~ t ~ ~ 1 ~~ ~ , ? ~ C~ , i _r t~. ~~ , i~ 2 _ A.'r `312 ~ ~ ~ ~ 1 ~ ' ~I~f _ ~.~ ~. ~, r ~' `~c P 11 ~ ~ ` `4\ 1~{ ~~• 1k~ I i , . ~,-.-.~- r ~ i ;.at ~ "~ ~ ~' ~Flll ~~\~ t z~;' ~~ ~ ~ ~~ ~~~J 89 ,~ 1,, ~' ~ ~ t , ~- c _ . 2 ~ r~. _~c'~ ~ 113 '~ ~ 1y ~ `,~„~~ ~{ -~,..._. 3g ~ ~ ?~_ A ~t Z ~ I .'170 ~~. ~ ~.. ~ ~S ~ ~ ~ ~-~__ ~~ 1 ~ , ,t ~~ ...~: ~; ~ .~ ~ z ~.~`~~~~~~~ 2 ~, 5] ~+~{ ~`' \' 112 \~~ ~~~. ~~~-% - "" ~ ~,~\. _~..~`~~. ~ 33 ; ' ~`~ jam. ~~~.' 1 ~, ~ . 1h ~ ~ ~ ~ f ~r~U6 ~£~..2 ~ 35 ~jl \\' - 33 a , _~ ~~ ~--- i -- _ i ~ b = / i'!~~ ~'~- ` 1 ~` , ,~ pg ~, - \\\ ~~ ~, 50 i ~ ~ 1!( c 5 `~:, _ 1:2 t"5 ~ 7 6 `'w._ ~~r~ ~ ~ 5 ~ \~--' ~ _ c-- , '~,`d t ~ ~~ ~ ~+-- x. Sj ~ ~ ,. ~, _ _. _ lloins'a~~et~ ~"~"'it I' 3: 4 l~`2 ;i C 2 t~ttCE5 ~:~ : -iS1lOSii TLN$ 4iAt£ 1 z4p;itJ Thurston County, Washington summer, irrigation is needed for lawn grasses, shrubs, vines, shade trees, and ornamental trees. Mulch, fertilizer, and irrigation are needed to establish lawn grasses and other small-seeded plants. Topsoil can be stockpiled and used to reclaim areas disturbed during construction. The main limitation affecting septic tank absorption fields is a poor filtering capacity in the substratum. If the density of housing is moderate or high, community sewage systems are needed to prevent the contamination of water supplies caused by seepage from onsite sewage disposal systems. The slope hinders the installation of the absorption fields. Absorption lines should be installed on the contour. Douglas-fir is the main woodland species on this unit. Among the trees of limited extent are Oregon white oak, lodgepole pine, and red alder. Douglas-fir and Scotch pine are grown on Christmas tree plantations. On the basis of a 100-year site curve, the mean site index for Douglas-fir is 140. On the basis of a 50-year site curve, it is 108. The highest average growth rate of an unmanaged, even-aged stand of Douglas-fir is 145 cubic feet per acre. per year at 65 years of age. This soil is suited to year-round logging. Unsurfaced roads and skid trails are slippery when wet. Logging roads require suitable surfacing material for year-round use. Rounded pebbles and cobbles for road construction are readily available on this unit. Disturbance of the protective layer of duff can be minimized by the careful use of wheeled and tracked equipment. Seedling establishment and seedling mortality are the main concerns in the production of timber. Reforestation can be accomplished by planting Douglas-fir seedlings. If the stand includes seed trees, natural reforestation of cutover areas by Oregon white oak and lodgepole pine occurs infrequently. Droughtiness in the surface layer reduces the seedling survival rate. When openings are made in the canopy, invading brushy plants can delay the establishment of planted Douglas-fir seedlings. Common forest understory plants are cascade Oregon-grape, salal, western brackenfern, western swordfern, Indian plum, and Scotch-broom. This map unit is in capability subclass IVs. 112-Spanaway stony sandy loam, 0 to 3 percent slopes. This very deep, somewhat excessively drained soil is on terraces. It formed in glacial outwash and volcanic ash. The native vegetation is mainly grasses, ferns, and a few conifers. Elevation is 200 to 400 feet. The average annual precipitation is 40 to 50 inches, the average annual air temperature is about 51 degrees F, 91 and the average frost=free period is 150 to 200 days. Typically, the surface layer is black stony sandy loam about 16 inches thick. The subsoil is very dark brown gravelly sandy loam about 6 inches thick. The substratum to a depth of 60 inches or more is grayish brown extremely gravelly sand. Included in this unit are small areas of Alderwood soils on till plains, Baldhill soils on terminal moraines, and Everett, Indianola, and, Nisqually soils on terraces. Also included are small areas of Spanaway soils that have a gravelly sandy loam surface layer and small areas of Spanaway stony sandy loam that have slopes of 3 to 15 percent. Included areas make up about 15 percent of the total acreage. Permeability is moderately rapid in the subsoil of the Spanaway soil and very rapid in the substratum. Available water capacity is low. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is slight. This unit is used mainly for hayland, pasture, or homesites. The main limitations affecting hay and pasture are the low available water capacity and the stones on the surface. Proper grazing practices, weed control, and fertilizer are needed to ensure maximum quality of forage. Rotation grazing helps to maintain the quality of the forage. Because of the surface stones, spreading animal manure, mowing, and seeding are difficult. In summer, irrigation is needed for maximum production of most forage crops. Sprinkler irrigation is the best method of applying water. The amount of water applied should be sufficient to wet the root zone but small enough to minimize the leaching of plant nutrients. This unit is well suited to homesites. Pebbles, cobbles, and stones should be removed, particularly in areas used for lawns. In summer, irrigation is needed for.lawn grasses, shrubs, vines, shade trees, and ornamental trees. Mulch, fertilizer, and irrigation are needed to establish lawn grasses and other small- seeded plants. Cutbanks are not stable and are subject to sloughing. The main limitation affecting septic tank absorption fields is a poor filtering capacity in the substratum. If the density of housing is moderate or high, community sewage systems are needed to prevent the contamination of water supplies caused by seepage from onsite sewage disposal systems. This map unit is in capability subclass IVs. 113-Spanaway stony sandy loam, 3 to 15 percent slopes. This very deep, somewhat excessively drained soil is on terraces. It formed in glacial outwash and ~ .1 APPENDIX B -Calculations 1 1 DEL'S FARM SUPPLY 03.13.07 PAGE 31 C ~ t atus of DEFAULTS at start of run. ( * May be reset by SET) ® Command file C.:\HYDRA\CMD\05-055T.CMD Input units are read as USA * Output sent to display Detailed * Output sent to printer Brief * Output sent to file Detailed Paper width in inches 8.000 String to reset printer- 27 51 36 18 String to set printer to compressed 17 15 String to set printer to 8 lines/inch 8 27 51 27 Name of printer di f P i h t Epson, FX series F l ng at page r nt ea op o se a Number of steps in hydrograph 144 Step length in minutes 10 Significant flow in hydrograph 0.010 * Maximum plot value T f h hi d l Selected by HYDRA t C ype o y rograp c p ot ompac Sanitary flow by Diurnal Curve ® Delay to start of actual storm 0.00 Rational Method computations Off ® SCS computations i i l i C ti Santa Barbara Off ont nuous s mu on computat ons a * Maximum d/D for pipe design/analysis 0.900 * Match point position on pipe O.OO or Invert * Number of allowable diam drops 999 * Mimimum drop thru manhole R h i ti t 0.000 ick n que ou ng ec Qu * Calculate sanitary flows True * Calculate infiltration flows True * Calculate storm flows True * Calculate misc flows True ® l: JOB Delis Farm Supplyn 100-Year 2: REM Size the swale for stormwater treatment 4 ~ ~i 2yhr~sr ~~~ 5: TOT 1..33 sets the total rainfail (p /~v~ 6: REM 6-month 1.33 in 7: REM 100-year 4.00 in 8: 9: FIL doe.inc "calls the doe unit hydrograph ~------START OF SUB-FILE------ l: HYE 10 0.00.0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.0 40+ 2: 0.050 0.050 0.050 0.050 0.050 0.050. 0.060 0.060 0.060 0.060 0.060 0.060+ 3: 0.070 0.070 0.070 0.070 0,.070 0.070 0.082 0.082 0.082 0.082 0.082 0.082+ 4: 0.095 0.095 0.095 0.095 0.095 0.095 0.134 0.134 0.134 0.180 0.180 0.340+ 5: x,0.540 0.270 0.180 0.134 0.134 0.134 0.088 0.088 0.088 0.088 0.088 0.088+ 6: 0.088 0.088 0.088 0.088 0.088 0.088 0.072 0.072 0.072 0.072 0.072 0.072+ 7: 0.072 0.0.72 0.072 0.072 0.072 0.072 0.057 0.057 0.057 0.057 0.057 0.057+ 8: 0.057 0.057 0.057 0.057 0.057 0.057 0.050 0.050 0.050 0.0500.050 0.050+ ' 9: 0.050 0.050,0.050 0.050 0.050 0.050 0.040 0.040 0.040 0.040 0.040 0.040+ 10: 0.040 0.040 0.040.0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 ® 0.040+ 11: 0.040 0,.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040.0.040 0.040 0.040+ ® 12: 0.040 0.040 0.040.0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040+ 13: 0.040 0.040 END OF SUB-FILE ------ r-lo-- 11: PDA 0.012.8 1 2 2 0.005 ~ sets default pipe values 12: NEW Bald Hi11s Road 13: SCS 0.34 0.76 98 80 5 14: PIP 30 347 347 NOTE: No flow to inlet. 15: CHA 60 346.20 345.00 0.041 3 4 3~- ~1~ 5c;•e•~~ 16: HOL bald 17: 18: NEW Parking lot, roof, and landscaping area 19: SCS 1.55 1.0 98 80 2 20: RES -1 0/0 10000000/0 "dummy pond to print volume. NOTE : No f low to inlet . l~~u~-- 21: REM REC bald ~ ~r' ~~ ~"~'b°~ 22: REM RES -1 0/0.59 99999999999/0..59 ~ ~~ 23: 24: - 25: END ----- S U M M A R Y O F A N A L Y S I S------ Run number on command file 47 Number of links 3 Number of hydrographs 37 Total sanitary population 0 ® Total sanitary .area .0.00 Acres Total storm area 1.89 Acres Number of pumps 0 Number of reservoirs 1 Number of diversion structures 0 Number of inlets 0 Length of new pipe : 30.00 Feet Length of existing pipe 0.00 Feet Length of channel 60.00 Feet Length of gutter 0.00 Feet Length of transport units 0.00 Feet Length of pressure pipe 0.00 Feet HGA, Consulting Engineers HYDRA Version 4.59 Olympia, Washington Page. 1 C:\HYDRA\CMD\05-055T.CMD______________________________________10:29 9-Mar-107 Del's Farm Supplyn 100-Year *** Bald Hills Road Invert Depth Min Link Long Diam Up/Dn Slope Up/Dn Cover ® 1 30 8 344.28 0.0050 2.72 2.00 344.13 2.87 Pipe Design San Sto Vel Design Estimated Inf Mis d/D CFS Cost 0.0 0.1 1.40 0.08 0 0.0 0.0 0.24 *** Bald Hills Road Ditch Shape Invert Surface Width San Sto ® Link Long Lft/Ctr/Rht Slope Up/Dn Up/Dn Depth Inf Mis ® 2 60 3.00 3.00 0.0200 346.20 346.24 4.2 0.0 0.1 4.00 345.00 345.04 0.04 0.0 0.0 ---------------------------------------------------- Lateral length= 90 Upstream length= 90 Channel Flow Cost Vel 0.08 0 0.56 *** Parking lot, roof, and landscape ~ Reservoir Invert ------------- - Maximum Flow Values ------- =---- ----- Link Up/Dn San Inf Sto Mis Design Cost 3 Unknown Discharge 0.00 0.00 0.00 0.00 0 0 ® Unknown Stored i 0 0 6227 57 00 0 0 0 0 00 622 57 Incom ng 0.00 . . . . --- --------------- Lateral length= ---------- 0 ------------------- Upstream length= ----- 0 pp /1P~vir~ ~e~ P~ Uv(~~- i r DOE Wet Pond Calculator Length 24 ft Width 30 ft side slope 1 3 side slope I 3 side slope 2 3 side slope 2 3 Base elevatic 344.00 ft Elevation Volume 344.00 0 344.50 402 345.00 894 345.50 1485 346.00 2184 346.50 2999 347.00 3941 347.10 4145 347.20 4355 347.30 4570 347.40 4791 347.50 5017 347.60 5249 347.70 5488 347.80 5732 347.90 5981 348.00 6237 348.10 6500 348.20 6768 348.30 7042 ~tatus of DEFAULTS at start of run..( * May be reset by SET) Command file C:\HYDRA\CMD\05-055T.CMD Input units are read as USA * Output sent to display Detailed * Output sent to .printer Brief * Output sent to file Detailed Paper width in inches 8.000 String to reset printer 27 51 36 18 . String to set printer to compressed 17 15 String to set printer to 8 lines/inch 8 27 5i 27 Name of printer Epson, FX series Print heading at top of page False Number of steps in hydrograph 144 Step length in minutes 10 Significant flow in hydrograph 0.010 . * Maximum plot value i Selected by HYDRA t C c plot Type of hydrograph ompac ® Sanitary flow by Diurnal Curve Delay to start of actual storm 0.00 Rational Method computations Off SCS computations i i l i i Santa Barbara Off ons on computat Cont nuous s mu at * Maximum d/D for pipe design/analysis : 0.900 * Match point position on pipe 0.00 or Invert * Number of allowable diam drops 999 * Mimimum drop thru manhole i i 0.000 k i ng techn que Rout c Qu * Calculate sanitary flows True * Calculate infiltration flows True * Calculate storm flows ~ True * Calculate misc flows True 1: JOB Del's Farm Supplyn 100-Year 2: REM Size the Swale for stormwater treatment 4 . 5 : TOT 4.00 sets the total rainfail ~ /v~ ~ac~ 2yGiv~r 6: REM 6-month 1.33' in 7: REM 100-year 4.00 in 8: 9: FIL doe.inc "'calls the doe unit hydrograph - --- -START OF SUB-FILE------ 1: HYE 10 0.00 0.040 0.040 0.040 0.04 0 0.040 0.040 0.040 0.040 0.040 0.0 ® 40+ - 2: 050 0.050 0.050 0.050 0.050 0. 0.050 0.060 0.060 0.060 0.060 0.060 0.060+ ' 3: 0.070 0.070 0.070.0.070 0.070 0.070 0.082 0.082 -0.082 0.082 0.082 0.082+ 4: .0.095 0.095 0.095 0.095 0.095 0.095 0.134 .0.134 0.134 0.180 0.180 ® 0.340+ 5: 0.540 0.270 0.180 0.1340.134 0.134 0.088 0.088 0.088 0.088 0.088 0.088+ 6: 0.088 0.088 0.088 0.088 0.088 0.088 0.072 0.072 0.072 0.072 0.072. ./o~- ~~ - z~hr ~ . 0.02+ 7: 0.072 0.072 0.072 0.072 0.072 0.072 0.057 0.057 0.057 0.057 0.057 0.057+ 8: 0.057 0.057 0.057 0.057 0.057 0.057 0.050 0.050 0.050 0.050 0.050 0.050+ 9: 0.050 0.050 0.050 0.050 0.050 0.050 0.040 0.040 0.040 0.040 0.040 0.040+ 10: 0.040 0.040 0.040.0.040 0.040 0.040 0.040 0.040. 0.040 0.040 0.040 0 ..040+ 0 0 11: 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 .04 0.040 0.040 0.040+ 12: 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.04.0+ 13: 0.040 0.040 END OF SUB-FILE ------ 10. 11: PDA 0.012 8 1 2 2 0.005 s ets default pipe values 12: NEW Bald Hills Road 13: SCS 0.34 0.76 98 80 5 14: PIP 30 347 347 NOTE: No flow to inlet. 15: CHA 60 346.20 345.00 0.041 3 4 3 16: HOL bald 17: 18: NEW Parking lot, roof, and landscaping area 19: SCS 1.55 1.0 98 80 2 20: 21 REM REC RES -1 0/0 10000000/0 "' ld b dummy pond to print volume - : a ~ ~~~~ Str~ ~no~ 22: RES -1 0/0.59 99999999999/0 .59 ~ ~ ~ ~~''"' ~~ NOTE : No f low to inlet . ~'~- " ~ ~ 23: 24: 25: END ----- S U M M A R Y O F A N A.L Y S I S------ Run number on command file 48 Number of links 3 Number of hydrographs 38 Total sanitary population 0 Total sanitary area 0.00 Acres Total storm area 1.89 Acres Number of pumps 0 Number of reservoirs 1 Number of diversion structures 0 Number of inlets 0 Length of new pipe 30.00 Feet Length of existing pipe 0.00 Feet Length of channel 60.00 Feet Length of gutter 0.00 Feet Length of transport units 0.00 Feet Length of pressure pipe 0.00 Feet HGA, Consulting Engineers HYDRA Version 4.59 Olympia, Washington Page 1 C \HYDRA\CMD\05-055T CMD______________________________________1032==9-Mar-107 Del's Farm Supplyn 100-Year *** Bald Hills Road Invert Depth Min Link Long Diam Up/Dn Slope Up/Dn Cover 1 30 8 344.28 0.0050 2.72 2.00 344.13 2.87 Pipe Design San Sto Vel Design Estimated Inf Mis. d/D CFS Cost 0.0 0.3 2.01 0.31 0 0.0 0.0 0.45 *** Bald Hills Road Ditch Shape Invert Surface Width San Sto Link Long Lft/Ctr/Rht Slope Up/Dn Up/Dn Depth Inf Mis 2 60 3.00 3.00 0.0200 346.20 346.28 4.5 0.0 0.3 4.00 345.00 345.08 0.08- 0.0 0.0 Lateral length= 90 Upstream length= 90 Channel Flow Cost Vel 0.31 0 0.92 *** Parking lot, roof, and landscapi Reservoir Invert ------------- - Maximum Flow Values ------- ---------- Link Up/Dn San Inf Sto Mis Design Cost 3 345.00 Discharge 0.0.0 0.00 0.59 0.00 0.59 0 ^ 344.00 Stored i 0 0 0 0 2356 16 00 2 0 0 35 16 0 00 ng Incom . 0 . . . . --------------- Lateral length= ---------- 0 ------------------- Upstream length= -------- 90 ~~Y~ ~~~~ ~~ ~f ~ ~~d K ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ® ~ r ~ ~ Pond Volume Calculator based on area Difference in Average Area Incremental Total Volume Elevation (ft) elevation ft Area (sf) SF Volume CF CF Infiltration .Pond 346.5 2, 532 0 0 0.5 2,696 347 2,859 ~ 1,348 1,348 1 ~ 3,208 348 3,556 ~ 3,208 4,555 1 3, 933 . 349 4,310 3,933 8,488 i t ^ Pond Volume Calculator based on area Infiltration Base Area 3,076 Base elevation 317.00 ft Infiltration Rate 10.00 inThr Flow out of base 0.59 Elevation (ft) Volume of infiltration pond 346.50 0 CF 346.60 270 CF 346.70 539 CF 346.80 809 CF 346.90 1,078 CF 347.00 1,348 CF 347.20 1,348 CF . 347.40 1,617 CF Greater than 100-yr 24-hr event 347.60 1,887 CF 347.80 2,156 CF 348.00 4,555 CF 348.20 4,555 CF 348.40 4,555 CF 348.60 4,555 CF 348.80 4,555 CF 349.00 8,488 CF