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Drainage and Ersosion Control Report 09-11-07
DEL'S FARM SUPPLY Drainage and Erosion Control Report. Reccived Prepared for: Linda Michaelis DFS Properties, LLC 10N Fairway Drive East Hoodsport, WA 98548 SEP 1 I NW (253) 312-4467 March 13,2007 Revised September 7, 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:loffice1J0B512005105-055-Del's Farm Supply - YeIm1RPT- Drainage-09.07.07.doc TABLE OF CONTENTS YELM REGION FACILfTY SUMMARY II. DRAINAGE REPORT ..................................................................................... ..........................7 Section i -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 ......._......._......._ ............. _. _......8 Section 9 -Covenants, Dedications, and Easements .......................... .......................11 Section 10 -Articles of Incorporation ................................................... .......................11 III. EROSION CONTROL PLAN ......................................................................... ........................12 Section 1 - Constmction Sequence ...................................................... .......................12 Section 2 -Trapping Sediment ............................................................. .......................12 Section3-Site Restoration ._......_.. .......... ............... ... _......._.13 Section 4 - Geotechnical Analysis ........................................................ .......................13 Section 5 -Inspection Sequence .......................................................... .......................13 Section 6 -Control of Pollutants other than Sediments ....................... .......................13 IV. STORMWATER MAINTENANCE PLAN ...................................................... ........................14 Appendix A -Site Plan Appendix B -Calculations I. YELM REGION FACILITY SUMMARY FORM Complete one for each facility (detention/retention, coalescing plate flter, etc.) on the project site. Attach 8 %" by 11" sketch showing location of facility. Proponent's facility name or identifer (e.g., Pond A): Name of road or street to access facility: Hearings Examiner rase number. Development Review Project No-/Bldg. Permit No.: Parcel Number(s): Storm Pond Bald Hills Road 64303200700,64303200704 To Be Completed 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 Proponent Project name: Del's Farm Supply Project owner: DFS Properties, LLC Project contact Linda Michealis Address: 10N Fairway Drive East, Hoodsport, WA 96548 Phone: Project proponent (if different): DFS Properties, LLC Atldress: 10N Fairway Drive East, Hoodsport, WA 98548 Phone: Project engineer: Steven D. Hatton, PE Firm: HATTON GODAT PANTIER Phone number: (360) 943-1599 09.07.0] PAGE 3 Part 2 - Project Location Section ................... .......... 24 Township ........_...._ ......... 77N Range ............. _.... _ ......... 7 E Names and addresses of adjacent property owners: Part 3 - Tvoe of Permit Aoolication Type of permit (e.g., commercial building): Other permits (®): ^ DOFIW 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, Loral, etc.) that have or will review this Drainage and Erosion Control Plan: NONE DEL'S FARM SDPPLV 09.OZp] PAGE 4 Part 4-Proposed Project Description What stream basin is the project in (e.g., Percival, Woodland, etc.)? Yelm Zoning:..... _.. _._.. _....... Commercial C-0 Onsite: Residential Subdivision: Number of lots .......................................................... Lot size (average, acres) .......................................... Building PennitlCommercial Plat: Building(s) (footprint, acres) ............._...................... 0.29 Concrete paving (acros) ........................................... Gravel surtace (acres) ......................... _..._......._..... Lattice block paving (acres) ............. _...._................. Public roads-including gravel shoulder (acres) ........ Private roads-including gravel shoulder (acres)....... Onsite impervious surtace total (acres) ..................... Part 5 - Predeveloped Proiect Site Characteristics: Stream through site (y/n)..._._ .................._..........NO Name ............................................ NIA DNR Type ..................................... NIA Type of feature this facility discharges [o (i.e., lake, stream, intermittent stream, pothole, roadside tlitch, sheettlow to adjacent property, etc.): TYPE OP DISCHARGE -Infiltration Steep slopes-steeper than 10% (y/n) .............. ........ N Erosion hazard (y/n) _......._.... _...._._...._ ........ ........ N 100-yearfloodplain(y/n).._ ..................__.._.... _._.._ Y Wetlands (yln)._...._..._._..__ ........................... ......_ N Seeps/springs(y/n)_ ........................................ ........ N High groundwater table(y/n) ........................... ........ Y Other DEL'S FARM SUPPLY Part 6 -Facility Description Total area tributary to facility including offsite (acres) .................... 2.59 Total onsite area tributary to facility (acres) .................................... 2.18 Design impervious area tributary to facility (acres) ......................... 1.97 Design landscaped area tributary to facility (acres) ........................ 0.50 Design total tributary area to facility (acres) .........................._.._... 2.59 Enter "1"for type of facility: Wet pond detention ................................................. 1 Wet pond water Surtace area (acres) ..................... Dry pond detention ................................................. Underground detention ........................................... Infiltration pond..._....._....._...__.........._.._ .............. - Drywell infltration.._ ...................... _............... _....... Ccalescing plate separator ..................................... Centrifuge separator ..................._.._.._.................. Other ...................................................................... Outlet type (enter "1" for each type present): Filter ........................................................................ Oil/water separator ................................................. Single orifce ........................................................... Multiple orifices ....................................................... 1 Weir ..............._................ _..........__.... _.._____...... Spi Ilway ................................................................... Pump(s) .....................__......_.._......._._................. Other ...................................................................... PaR 7 -Release to Groundwater Design percolation rate to groundwater (if applicable) .........................inches per hour Part 8 -Release to Surtace Water fit aoolicablel Thurston County MSL Percent Design Discharge To Surtace Elevation Ift.l Full Volume Icu. ft.l Water lefsl 346.00 6 g.o9 0.00 347.00 25 12,110 0.027 348.00 50 25,003 0.046 350.00 100 55,670 14.79 DEL'S FARM SUPPLY 09.0].0] 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 storoge barn on 7.47 acres. The site is located east of the intersection of Yelm Avenue (SR 507) and Bald Hills Road. The Tax Parcel numbers for this project are 64303200700 antl 64303200704. The site is zoned Commemial (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-of-way permits. Stormwater Best Management Practices will be provided for the project including water quality treatment. Treatment will consist of a bio-tiltration Swale for Bald Hills Road improvements, and a wet pond for the onsite impervious areas. These facilities are designed to treat the 6-month event. Stormwater quantity runoff impacts are mitigated by an onsite infltration 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, portions of the undeveloped area are being dedicated to the City for Yelm Avenue and Bald Hills Road. Descnotion I Impervious An=a /ac) Total An:a (ac) Bald Hills Road (offsite) 0.32 0.41 Parking lot and roof area 1.65 2.06 Pond area 0.12 0.12 Sub Total 2.59 Area draining to existing dry well 0.50 0.50 Area dmining to landscaping 0.11 0.11 Area to remain in natural 3.55 condition (not draining to oond) Section 2 -Existing Conditions There is no significant offsite drainage tributary to the storm facilities. The Yelm Avenue right-of-way is located nodh of the site, and is lower than both the site and [he parcel. The crown of Bald Hills Road prevents water from entering the drainage system from the southwest. The site generally drains to the east, a[ 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 sails are generally considered rapid. However insufficient separation between ground water and fnished grades prevents the use of infltration on this site. DEL'S FARM SUPPLY 09.0] 01 PAGE Section 4-Wells and Septic Systems Recerds 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 [he Department of Ecology were searohed 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 untler 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 Flootl The Federal Emergency Management Agency prepares maps for all areas within Thurston County, including the inwrporated cities therein. Panel #530188 0365 D depicts the areas, if any, subjected to flooding in the vicinity of this proposal. By inspection of [his 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. The east portion of the site is located in a Zone A7 with elevations between 344 and 345. 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. Section B -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 2003, that has been developed by the Washington State Department of Ecology. The stormwater conveyance system antl drainage control features have been analyzed using the W WHM computer modeling software. A copy of the W WHM model is locatetl in Appendix C. Pond Sizing Pre-Developed Site Hvdrolo The pre-developed conditions for stormwater modeling purposes was set to forested conditions per the requirements of the drainage manual. The soils are tills. The site was divided into two basins, Basin 1 is the parking lot and pole barn, Basin 2 consists of the frontage improvements. Basin 1: Acreage: 2.18 ac Soil Group: Till Modeled as: Forested DEL'S FARM SUPPLY 09.07.0] PAGE 6 Basin 2: Acreage: 0.41 ac Soil Group: Till Modeled as: Forested Pre-Developed Condition Event Output: W WHM version 2.0 Retum Period Total Flow Rate 2-Year 0.07 5-Year 0.11 10-Year 0.14 25-Year 0.16 50-Year 0.18 100-Year 0.21 Developed Site Hydrology: The parking lot consists of landscaping, roof area, and paved parking areas. The soils are tills Basin 1: Land use and Cover Condition: Parking lot Paved and building Modeletl as: Streets/sidewalks/parking Acreage: 1.65 ac Modeled as: Pasture Acreage: 0.41 ac Modeled as: Pond Acreage: 0.12 ac Soil Group: Oulwash Basin 2: Land use and Cover Condition: Street Improvements Modeled as: Streets/sidewalks/parking Acreage: D.32 ac Modeled as: Lantlscaping Acreage: D.09 ac Soil Group: Outwash Developed Unmitigated Condition Event Output: W WHM version 2.0 Return Period Total Flow Rate (cfs) 2-Year 0.52 5-Year 0.63 10-Year 0.69 25-Year 0.77 50-Year 0.83 100-Year 0.89 OEL'S FARM SUPPLV 09.0].0] PAGE 9 Discharge SWCture Riser Height Riser Diameter Orihce 1 Diameter Notch Type Notch Height Notch Width 3 feet 18-inch 1.00 inch Elevation 0 feet Rectangular 1.17 0.04 NOTE: Elevation is measured from the pond bottom. Pond Dimensions Depth 4 feet Bottom Length 105.75 feet (plans 224 feet) Bottom Width 105.75 feet (plans 50 feet) Side Slopes 3:1 Volume at Riser Head 0.909 acre-feet Developed Condition Event Output: W WHM version 2.0 Return Period Pre-Developed Developed with Developed w/ Flow Rate (cfs) no pond Pond Flow Rate 2-Year 0.07 0.52 0.054 5-Year 0.11 0.63 0.085 10-Year 0.14 0.69 0.11 25-Year 0.16 0.77 0.14 50-Year 0.18 0.63 0.17 100-Year 0.21 0.69 020 Wet Pond Sizing: The wet pond was sized to meet the 1995 Washington State Department of Ecology's standards for the Puget Sound Basin (DOE). The pond will treat the onsite parking, frontage improvements, and roof area. The DOE standard is a pond with a permanent pool depth of 3-fi feet deep, and a minimum volume equal to 6-month rainfall event. Step 1) Calculate the volume of the 6-month event. W WHM estimates the volume of the 6-month event to be 0.1165 ac`ft (5,075 cf). Step 2) Confnn the wet pond volume is provided by the proposed pond. The plan is for a 3-foot deep wet pond with a bottom area of 15 by 65 feet. The wet pond will be located in the bottom of the detention pond, and additional treatment will be provided by the detention pond bottom. An Excel spread sheet was used to estimate the volume of a 15 x 65 foot pond with 3 tot side slopes to be 5348 cf (0.1228 ac`ft) at 3 feet deep. Use a 15 x 65 foot pond bottom with 3 to 1 side slopes for the wet pond. OEL'S FARM SUPPLY 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 governing 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 Brent easement for access to the governing body to inspect the stormwater facilities. The agreement also makes provisions for the governing 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 fhe property owners, their heirs, successors, and assigns. Section 10 -Articles of Incorporation Not applicable. UEL'S FARM SUPPLY n9 n].0] PAGE 11 III. EROSION CONTROL PLAN Section 7 -Construction Sequence Prior to cemmencing any grading or filling upon the site, all erosion control measures, including installation of a stabilized construction entrance, shall be installetl in accordance with this plan and the details shown on the drawings. More specifcally, the following construction sequence shall be observed: 1. Construction on this site shall be conducted substantially in accordance with the censtrudion 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 centainetl within these plans. 2. For each phase of the development of this site, the following general sequence shall be observed: a. Install perimeter hlter fabric fence as shown. b. Install inlet protection for existing inlets in the vicinity of areas [0 6e disturbed. c. Call for inspection by the project engineer. d. Construct tempomry sedimentation turp(s) and outlet(s). e. Perform grading directing 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 centrol facilities, and repair, modify, or enhance as directed or as required. Section 2-Trapping Sediment Protection of ofisite properties against sedimentation is an absolute necessity. Additional measures may 6e 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 offsite shall 6e 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 tmcking of mud onto public rights-0f-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 onsite and shall not 6e allowed to discharge downstream without treatment. DEL'S FARM SUPPLY 09.0].0] Section 3 -Site Restoration Disturbed areas on and offsite shall be hydroseeded or otherwise landscaped or stabilized upon project cempletion to provide permanent erosion control where required. Erosion control measures shall remain in place until foal 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 tempomry sediment ponds will be excavated into the native soil. No emhankment 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 (censtmction entrance, sediment turps, and erosion control barriers) pdor to commencement of construction. During and following constmction, the Engineer shall inspect the constmction of the permanent stormwater facilities and report to the permit authority his fndings as to performance and operability of the cempleted system. Section 6-Control of Pollutants other than Sediments A centralized equipment marshalling area and containment area is to be provided onsite for equipment maintenance and storage of any equipment service materials. An area onsite 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. nEL'S FARM SUPPLY 09.0].0] PAGE 13 IV. STORMWATER MAINTENANCE PLAN DEL'S FARM SUPPLY REVISED SEPTEMBER 7, 2007 DEL'S FARM SDPPLY 09 0] 0] PAGE 14 TABLE OF CONTENTS STORMWATER FACILITY MAINTENANCE GUIDE ........................................................................ 16 INTRODUCTION......._...._......._. ___._ ....................._................_.... What is Stormwater Runoff?......._ ......................._...................... What is a Storm Drain System and how does it Work?........._..., What does Stormwater Runoff have to do with Water Quality?... Your Stormwater Facility....._..........____............__ ..................... Who is Responsible for Maintaining Stormwater Facilities? _.._.. How to Use the Stormwater Facility Maintenance Guide ............. Included in This Guide ................................................................. A Regional Approach to Stormwater Management ...................... VOUR STORMWAYER FACILITIES ................................................. FACILITY KEY ................................................................................... SITE PLAN ........................................................................................ QUICK LIST ....................................................................................... MAINTENANCE CHECKLISTS ......................................................... Ponds ........................................................................................... Catch Basins, Manholes, and Inlets ............................................. Conveyance Pipes, Ditches, and Swales .................................... Grounds and Landscaping __ ..............._.....__.... _.._._...._...___. RESOURCE LISTING ....................................................................... II. POLLUTION SOURCE CONTROL PROGRAM .......................................................... ......................27 What Are Pollution Source Controls And Why Are They Needed? ..................... .....................27 Matedals Usetl And Wastes Generated ............................................................... .....................27 Required Actions ..................................._........................_....._............................ ._._.........__..27 mEL'S FARM SUPPLY 09 ml 07 11. STORMWATER FACILITY MAINTENANCE GUIDE INTRODUCTION What is stormwafer Runoff? When urban and suburban development rovers the land with buildings, streets and parking lots, much of the native topsoil, duff, trees, shmbs and gress are replaced by asphalt and concrete. Rainfall that would have soaked directly into the ground instead stays on the surtace as stormwafer runoff making its way into stone drains (including man-made pipes, ditches, or Swale networks), stormwafer ponds, surtace and groundwater, and eventually to Puget Sound. What is a Storm Drain System and how does it Work? The stone drain system for most developments includes measures to carry, store, cleanse, and release the stonnwater. 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 stormwafer to the treatment and storage area. Swales and ponds filter pollutants from the stonnwater by physically settling out particles, chemically binding pollutants to pond sediments, and biologically converting pollutants to less harmful wmpounds. Ponds also store treated water, releasing it gradually to a nearby stream or to groundwater. What does stormwafer Runoff have to do with Water Quality? stormwafer 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 untreatetl, pollutetl stormwafer can reach nearby waterways where it can harm and even kill aquatic life. It can also pollute groundwater to the extent [hat it requires treatment before it is suitable for drinking. Nationally, stormwafer is rewgnized as a major threat to water quality. Remember to keep everything out of stormwafer systems except the rainwater they are designed to collect. Vour stormwafer Facility Different types of ponds are designed for different purposes. For example, wet ponds primarily provide treatment of stonnvrater. Dry ponds or infiltrafion ponds are designetl to provide storage for stormwafer and allow for i[s gradual release tlownstream or into the ground. Who is Responsible for Maintaining stormwafer Facilities? All stormwafer facilities require maintenance. Regular maintenance ensures proper functioning and preserves visual appeal. This stormwafer Facility Maintenance Guide was designed to explain how s[ortnwater 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. stormwafer facilities located in public rights-0f-way are maintained by local governments. os ozm How to Use the stormwater Facility Maintenance Guide This Maintenance Guide includes a Site Plan specifc to your development and a Facility Key that identifies the private stormwater facilities you are responsible for maintaining. A "Quick Lisp 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 stone drain systems functioning smoothly. ^ Resources to provide more information and technical assistance. A RegionalApproach to stormwater Management The Gities of Lacey, Olympia and Tumwater together with Thurston County are taking steps to educate and involve area residents in wafer quality issues and stormwater management. stormwater runoff is a widespread cause of water quality impairment and stream degradation. Thejurisdictions 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 [he feature type and checklist name. FACILITY KEY The stormwater facility in your neighborhood is comprised of the following elements: Typebf Fea[ure S CFieckhst Name~~ ~ r" NLoration on Site Plan Ponds 1 Catch Basins, Manholes, and Inlets 2 Conveyance Pipes, Ditches, and Swales 3 Grounds and Landscaping 4 PAGE 1] ~-~*+>B ~ boa 1~oN ~ o~ I ~ eeza~~vc~o ~ivy~~vena coe-onc ~~ai za dm aaivmwni msaa ~ y^31n 09 S3NaV6 8 _ NY1d 3115 L65BB'tlM'Wl3A 3S atl T11H 4'ltl9 9 49O t c 8 o°~ vN " -~S a ~ ~bJ~~ el 33 0N3 en ow3nn ne 2J311NVd J_HC70.J 6N OJIVH ~ e ~b __ AlddflS W2iV.j S~'l3^ " ~W~ ~ l i s ~ ~ ~?p~ Qom''\~< _ ~: x"r ~ V a ~ ~~"~s"> ~:C~wgw "~!XRIe" s ~ .~ m n J" O1 Q W } M )W I~ V• ii', J 1.1n 2 4 ...~ m W `° 0 0~ 3 6~ ~ii~ g : € d5~~d~d3EdEdE~Lb~3 `tlo€~ ~" I w gg£YYg~~7$ e~~`x leg ~~~gg ~~~ii ~23 ~~. $oe:~ce:~eee€auee::.E a.Ee~E Q ,.,r. >i' r~,~a - r I., z S: g€g k Epp Ed @ ~ ~5 ask H~:~~ ~ s 69~~e~ ~p~; gg 3°~ A € ~W €° 4 e~n~~ o~ °~~9 ; gad ~~~i¢~ ~~~e~e ~~~ ~~ ~:~ ,y~ ~, ~ ~ ~~~a; ~ e ~~ i°3 'E8g` g§ a°3~ ey ~'~k e~~ @~ ~ie° $ ~i§ p' € ~ ~€~§~g~g ° i ~~e oad '~~~~~ ~? ~~~~ Ey s,~~;!' 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J~ / i I ~' v .. ~ - ~" ~ ~~~ ~ ~ \ I I /~ ~ A i / /~ ,, ~ ~ ~ ~ _ `= // i~ i ~ j /Y/l g~ / A € ~8 5 / ' E ~ / Y ~ /~ " ~ ~ ;5~ 5 ~. ~ '~ ` ~ o o I S4 ~ ~ y ~ gZ' 4G ~: ~ ~ z ° ° ~ Fo ~07 5 i ~i ~So~ um p9 i ; ~~ ~ =~C§ ~~ ~a ? ~ ~~ z y~j F m $° ~~ ~ Y ° ~ K W ~¢o~ ~~ ~1¢ £ [ g £! i UU =F 083^ rc~ mS w~ ~ N N w o 8 UV p ~. ~w $ U m. m U p ~ ~ Z a w~ a ~ < 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 wnjundion 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 grete 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) al the inlets and outlets of culverts and other pipes. If they are silted in or eroded away, replace them. UEL'S FARM SUPPLV 04 W.O] PAGE 19 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 idenfifed 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 diffcult or strenuous, there are a few tools that will make the job easier and safer including: ^ Aflashlight. ^ 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 wnsultants who designed and wnstrocted your facilities. SAFETY WARNING: In keeping with OSHA regulations, you should never stick your head or any part of your hotly 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 confned spaces. NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF THE OPEN HOLE. 09.Oa. W PAGE 2D 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 infitration and wet ponds. INSPECTION AREA FREQUENCY LOOK FOR ACTION Entire Pontl puartedy Vartl waste such as grass clippings Remove bash and tlebris and tlispose of properly. antl branrties in basin; presence of glass, plastic, metal, foam, or coated paper. Entire Pontl Quarterly Vegetation that may constitute a Remove invasive ar noxious vegetation. Do not public hazaN, e.g., tansy ragwort, spray chemicok on vegetation wdhoul obtaining poison oak, stinging nettles, guitlance from WSU Cooperative Eztension and tlevikdub. a rovalfrom C' or COUn . Entire Pontl Quarterly Presence of chemicals such as First, attempt to locate source of pollution; then call natural gas, oil, and gasoline, Motlerole Risk Waste program at Thurston County noxious odor, or stud e. Environmental Health to report [he hazartl. Entire Pond Quadetly Sparse, weedy, or overyrown grass Grassy ponds selectively thatch, aerate, antl re- in grassy (dry/infiltration) ponds; seed ponds. Grass should be kept less than e presence of invasive species or inches hgh. Wet ponds: hantl-plant nursery- sparse growth of plants in wet grown wetland plants in bare areas. Contact WSU ponds. Cooperative Extension for guitlance on invasive spades. Pond bottoms shoultl have ungcim tlense coverage of tlesired plant species. Entire Pontl Quarterly Evitlence of rotlent holes Rfadlily Destroy rodents antl repair tlam or berm. Contact isatlam or bens. Water should Thurston County Health DeparMent for guitlance. not flow throw hrotlent holes. Entire Pond Quarterly Nuisance insects such as wasps, Destroy or remove insects. GOntad WSU homeLS Or mosquttoes that may Cooperative Extension for guidance. intertere with maintenance. Entire Pond Annually Confirmation that trees are not Prune tree limbs to allow for maintenance. Same interfering with maintenance (i.e., trees maybewL mowing, sift removal, or access.) Inlet Annually Confirmation that [he tlprap under Replace rocks antl/or remove setlimenl. the inlet pipe is intact antl that no native soil is exposed. Also, look for aaumulations of sediment greater than hag the height of the corks. Outlet Quarterly Afree-flowing overflow that is dear Replace Rp2pgmissing. Remove fresh or debris of debris. antl tlispose of propert. Sitle Slopes Annually Signs of erosion around inlets antl Attempt to tletertnine the rouse oferosion antl outlets. Inspect berths for signs of repair it Stabilize slopes by reinforcing wtth rock, sliding or settling. Take action if planting grass, or compacting soil. Contact WSU erotletl tlamage is over 2 inches Cooperative Extension for guitlance on slope tleep antl where there is potential reinforwment. for continued erosion. Storage Area Annually Sediment builtl-up on pond bottom. Remove the sediment antl re-seed the pond if A buried or partially buried outlet necessary 1g improve infiltration and control sWcture or very slow infttraticn erosion. rate may intlirate signRwnt setlimenl deposits. Dikes Annually Signifinnt settling of any pad of Builtl dike bark to the original elevalioa tlike. Emergency Annually Intact riprep protective area. Repair Replace rocks sc all native soil is covered. Overtlow/Spillway if an native soil is ex osetl. Trench Drain Qaartedy Confirmation that the grate is dear Remove tlebris from grate, clean tlrain. o(tlebris antl that the drain is not plugged. OEL'S FARM 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 FREpUENCV LOOK FOR ACTION AREA Catch basin During and after Accumulation of Vash or debris in front of Remove blocking trash or debris wiN a opening major slonns catch basin opening that prevents water rake and clean ofl [he grate. from flpwin in. ' Catch basin Ouartedy Setliment or debris in the basin. No more Remove debhs from vetch basin. than half the depth from the bottom of the pipe to the bottom of [he basin should be allowed to a¢umulate. Use a long stick or broom handle to poke into sediment antl determine tlep[h. Inlet and outlet Quartery Trash or tlebris in the pipes lha[has Remove trash ordebds from inlet and pipes exceetletl 1/5 of their height. Ensure [here outlet pipes. are not tree roots or other vegetation rowin in the pipes. Inlet antl ouget Annually Cracks widerthan Xinch and longer than Repair uncles or replace thejoinfs. pipe joints 12-inches at the joint of any inlet or outlet pipe. Ako check for evidence of sediment enledn the catch basin [hreu h sacks. Grate Quartets Cracks longerthan 2 inches or multiple Replace grate rf necessary. cracks. Frame QuaMM Confirmation that [he name is sNing 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 antl the slab should be corredetl. Catch basin Annually Cracks widerthan X inch and longer than 3 Replace or repair the basin. QOntacf a feet. Also check for any evdence of pmfessipnal engineer kr evaluation. sediment entering the catch basin through cracks. Determine whether or not the sWCture is sountl. Catch basin QuaMtly Chemicals such as natural gas, oil, antl Clean out catch basin. ContaG your gasoline have may have en[eretl [he catch local judstlictipn gr Thurston County basin Ched for noxious odor or oily Environmental Reagh Ryou tleteda stud e. wlor, otlor, or oil slutl e. OiVwater Quartery Significant sludge, oil, grease, or scum layer Remove the catch basin litl antl skim oft separator covering all or most W the water sudarc. oil layer. Pour oil into a disposable (dpwntumed conainer, seal container, vaap securely elbow or'T in n newspaper, and place in trash. Water catch basin) surface should be clear of oil layer. Pipe elbow Quarterly Damage to top or bottom of pipe; determine I! pipe is broken, replace pipe in whether pipe is plumb. accortlance with approved plans on file with your local jurstliction. DEL'S FARM SUPPLY Conveyance Pipes, Ditches, and Swales INSPECTION FREQUENCY LOOK FOR ACTION ARFl~ Pipes Annualy Confirmaton that accumulated setliment has Clean pipes of all setlimenl and not ezceetletl 20% of the tliameter of the pipe debds. Remove all vegetation so antl that vegetation has nd retluretl free that water flows freely through movement of water through pipes. Ensure That pipes. Repair or replace pipe as the protective coating is not tlamagetl antl necessary. rusted. Dents should not signifipntly impetle flow. Pipe should not have major cracks or tears allowin water to leak out. Open ddtlres OuarteM Yartl waste or Idler in the dRCh. Remove trash and tlebds antl dispose of propert . Open tlflches Annually Confirmation [hat accumulatetl setlvnent has Clean ddch of all sediment antl not exceetletl 20% d [he depth of the tlflch. debds. Open tlflches 8 Annually Vegetation (e.g., weedy shrubs or saplings) Clear blotlcing vegetation sm that Swales that retlucesthe free movement of water water flows Neely through tlilches. through ditches or Swales Grassy vegetation should be left alone. Open tlilches8 Quartedy Signs of erosion. Inspect slopes for signs of Eliminate poses oferosion. Swales sloughing or settling. Action is needetl where Stabilize slopes by using erotletl tlamage is over 2 inches tleep antl appropda[e erosion mntrol where potential for centinuetl erosion exists measures (e.g., reinforce wflh rorx, plan) rass,wmpad soil.) Open tlflches 8 Annually Adequate rode placenrenl in splash pad, check Replace rocks to design standard. Swales tlam ar linin .Native soil shouts not be visible. Swales Quartedy Adequate grass mvemge. Take action fl Aerate soils, reuetl and mulch wverage is sparse antl weetly, or areas are bare areas. Keep grass less than 8 overgrown wflh woody vegetation. inches high. Remove woody growth, regmde, and reseed as necessa Swales Quartedy Confirmation that Swale has not been filletl in If passible, speak with homeowner or blocked by structures, shmbbery, etc. antl 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. Gentles shoultl be between 1-5%. OEL'S FARM SUPPLY 09.0].0] PAGE 23 Grounds and Landscaping INSPECTION FREQUENCY LOOK FOR ACTION AREA Landscaped Quartedy Uncontrolletl weetl growth in lantlsppetl If possible, pull vreetls by hantl [o avoid Areas areas. usin chemical weed centrols. Landspped Quartetly Presence of poison iry or other poisonous Remove poisonous vegetation or Areas v etafion or insect nests. insect nests. Landsppetl Quartets Yard waste or liner. Remove and dispose of pmpetly. Areas Landsppetl Ouarterty Noticeably vkible rills in lantlsppetl areas. Identify the poses or erosion and take Areas steps to slow tlovm or disperse the water. Fill in mntour, seetl area. Trees antl Annually Spld, broken or oNerwise damaged tree Trim trees antl shrubs to restore shrubs parts antl shrubs. shape. Replace severely tlamaged tees antl shrubs. Trees antl Annually Blown down or knocked over trees or shrubs. Replanltrees or shrubs, inspecting for shmbs injury to stem or mots. Replace rf severe dama etl. Trees antl Annualy F~osetl roots, inatlequale support, severe Place stakes and robber-coatetl ties Shmbs leaning. around oun trees/shmbs for su ort. UEL'S FARM SUPPLY 09 0].0] PAGE 24 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 Engineers Information: HATTON GODAT PANTIER 1840 Barnes Blvd SW Tumwater, WA 98512 (360) 943 -1599 DEL'S FARM SUPPLY D9 e].n] PAGE 25 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. INSPEOTION GATE: PERFORMED aV: PHONE NUMBER: ADDRESS: POSITION ON HOA: CITY, ST, LP: ~_ ~ ~• ___ _ _ _-.__ __ i ___ i i ____.. _ ' ~ __ __ I 09.OZ0] 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 predices° (BMPs) include: ^ Altering the activity (e.g., substitute non-tonic 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 mnoff away from an area that is centaminated) ^ Routing mnoff from the activity to a treatment al[emative (e.g., a wastewater treatment facility, sanitary sewer, or stonnwater treatment area)- Pollution source controls are needed because of the contamination found in mnoff from wmmercial areas and the effect of this contamination on aquatic life and human health. Research on urban mnoff in the Puget Sound area and elsewhere has found oil and grease, nutrients, organic substances, tonic metals, bacteria, viruses, and sediments at unacceptable levels. Effects of contaminated runoff include closure of shellfish harvesting areas and swimming areas, mortality of young fsh 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 stonnwater may exceed the Ecology guidelines of 10 mg/1. Although there are no local data to confrm this view, limited researoh in the San Francisco Bay area found the mean concentration of ail antl grease in stonnwater 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 - Dmins 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 cencentrated 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. 0EL'S FARM SUPPLY 09 0] n] PAGE 2] APPENDIX A -Site Plan DEL'S FARM SUPPLY ~N ^i,~ Ntl~d 3115 ~ 0,9~ S ~3A][ x~~Q~at ~ aez~~az s~~v~in~u3lvm .u ae .jai G6996'VM'Wl3A - 9 LEI -mod ~ eoa nannoe s3u ve Deer 3u5 .nowannne a~.v naaniona -- 39 ON TIH Oltl99teOt T-"'~"'N° k" TJd11NHd tl 1V40Ja eN011VH Anaans wav~.~ s.'734 " ~ o ° s~~.aaariro~s~a ~ u ~sma _ . i a 3 ~ €aY~ 2 n n ' g e .-e ~~~^ A ~~~ rt A p~yn J N IL ..l I I ~~ I i i w w S: ° 62 2J j 2 ~p gp O S 20 io ~a a ~ ii ~p~r''.e i.r~F o z@zaz o i9"S~~"o°a5gogo~ ~NOD~W~KW Wd.WY W W OKW ~6V:27WF6Qp W OWOOONOOMUj ~j ~vN y 'Fna nr;n m"~-- ` ~ > ~ o v oo ° ~ a y n ' LL D ~. i ' _ _ ...~ i- i~ ~€ '3 0' 11 _ ././' .i . f ~ / / t ~ ~ s ji / ~ ~ ' _/ /~ , ~ / i / ~ ~ / ~~ ~ j3e ~ s`g ~ / ~ joLL . a / ~ W ¢ ~ ' ' ~ ~~i ~ ~u~ ~W~ m b ~ ~'~/ FEg ~'s sx~ i Obi ©z~ Oo•a ~ , e o~S ~ ` w ~ ~P £a ~a i § ~ ~ g" ~~ ~d w : ~ ~ ~ee ~ ~~o~ ~ :9 z ~, i _ 5nn4 ~~ a' ~ g ~ od a ° .~ 3 s 9 S ~' ~9 ~ oS S~ o rco w $Bw ' i ` e u ~ o , < ~„ p i ~ < ~ a _ ~ a . - S W >: ay ~ a~~~aataaataa~aa11}avpaa3e9€ ~~: i lk:o.o.•o.l.tllirP`~I~ w w ~ ~ ~e3 . 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T L...~. i I \ I I ~ \ ~ I I p I ~~ II z'° \ \ u I po ~ w \ y \ $C I o _ L I V I ~ 1 _ ~ \ I V ~ ~ „ r ... ~ ~ 1 N \ ..,,. ___ r-x ~ ~ ' ~ tau' ~ r ~ 0 1p~! T{ i ~ I ~ ~ i 1 ~ ~% ~~~ uTi~ r aps ~ it ~ I i~~~~~t 3~ ag tlp ~, ~ m~~~~ ~ iii@@@@ i9 ~ E (p~ B { e u i 9 iiC ~B tre 7 Pa ~ ~~~ (~~i ~~ x E~~Ri i o daF,gy~ €S It nS FWi ~". x I~,SE~"7~~~,rf , atl ~ r kt c ' a I ~yq~y3t~ ~a``@ ~ ~~~§rp ~r/ I~~R4 t !~` f ~I9- {I~ 4 e ~ / f .~ 1F~ ~~... I F:~~t~~--~ 1 S ~tyy Ip ~s~ E~ x?Yteya " .. Ae`Rir RL x~ ~~~ ~ ~/, ~ ~~~ \~~\ ..------~------ ------ ~--- ------a r i.4 x " 2 $ ~ ~ - i-6'~ ¢ Z 6 m a W m ~ Yf-~s U e £ j m (P~$& Z ~ U ~ F F `d S.i a'9°9 e ~ 2 ' ' .1 `~ F Z o i c 3 'ej-. z W~ F B° a 4ei`= ~ _. .s~- ! '~ 8 s V O p ~ oa ~ 'n o ~ ~ {_ •..~ + u ~ i /. rv ~ d 3,1 j: u ~ / Ot 4r / N . . `/ N p M / : o~ . ¢ .om ~ m ~ j u. e w o , w s I a~ ~: ° Gz r u o a W ~ ''s ~ . / .: ~ o e. o . N o i w p E f~/ w o u ° J 2 O ° _ u J ur ~ fa yaa~ ~ ~ a c ,,. 2 E° -3 ~ O / ~ ~ ` aerer~.o a v xi..o „ y ~a E~~ I ~ . a C / ~ „= ~ . I ~ g ! , ` J y Eg a v a ~ • N m $ O .o d to - Mo e~ ~ ~ 0 s~ 'v5 a = ~ ii s ~ ¢ u g a i ~__ _- -- __. a 6 e i~~ ~~= e Q • _ _ ~ _ C W = A ~ _ W ~" APPENDIX B -Calculations UEL'S FARM SUPPLY 03.13.0] PAGE 29 ;a[ FLO6tIHS1 100 1052 50 .10% 25 .1665 f0 .1310 5 1118 i 2 Ai13 11.0 1A d .~ p Predeve ed 16 ve-1 Mil t x%k O rLb~~si~Hr`°%%%w~X1~" 1rE-2 t 70 20 3p AOSOfiO 70--80 90 99 tern nlMk~ 700 b~2 ~ R o Pretlevelppetl 5g gjlg x Uevelvped with Facilfty 25 Pao p 0.75 -..-_ ~1a sgrl II qq I ,~ att ~5 6261 ~~ I ~~ I;'~ ~~ ~ ~ A V ,i R i. I!i , i I ~ ~ I J ~ ao~ i sn< ,r d I ' ~ty ~ '~ ~ 10 aoa ~a ~~ _~ ~ 70E-5~ 10E-4 70E3 t0E-2 teE-1 t 10 Percent Exceedtn Yearlv Peaks for developed W/O Pond Duration Graph WESTERN WASHINGTON HYDROLOGY I+IDDEL V2 PROJECT REPORT Project Name: OS-055 dels final Site Address: Oity Yelm Report Date 09/06/2007 Gage Olympia Data Start 1955 Data End 1999 (adjusted) Precip Scale: 0.80 PREDEVELOPED LAND USE Basin Basin 1 Flows To Point of Compliance Groundwater: Nn WESTERN WASHINGTON HYDROLOGY MODEL V2 PROJECT REPORT Project Name: OS-055 dell final Site Address: City Yelm Report Date 09/06/2007 Gage Olympia Data Start 1955 Data End 1999 (adjusted) Precip Scale: 0.80 PREDEVELOPED LAND USE Basin Basin 1 Flows To Point of Compliance Groundwater: No Land Vse Acres TILL FOREST: 2.18 Basin Basin 2 Flows To Point of Compliance Groundwater: No Land Use Acres TILL FOREST: 0.91 DEVELOPED LAND USE Hasin Basin 1 Flows To Pond 1 Grovndwater: No Land Uae Acres Oi1TWASH PASTURE: 0.91 'INdPERVIOUS: 1.77 Basin Basin 2 Side slope 2: 3 To 1 Side slope 3: 3 To 1 aide slope d: 3 To 1 /olvma at Riser Head: 0.909 acre-£t. Discharge Structure Riser Height: 3 £t. iiaer Diameter: 18 in. NotchType Rectangular Notch Width 0.090 ft. Votch Height: 1.169 ft. Orifice 1 Diameter: 1.001 in. Elevation: 0 ft. Pond Hydraulic Table S tage (ft) AiBa lacc) VoLme(aci-fU DB 1~rglefe) Infilt lCSe) o. ooo o. zs7 0. 000 o. ooa a. ooo 0. 094 o. zse o. ou o. oa6 0. 000 3. 089 0. 259 0. 023 0. 008 0. 000 0. 133 0. 261 0. 039 0. 010 0. 000 0. 178 0. 262 0. 046 0. 011 0. 000 0. 222 0. 263 0. 056 0. 012 0. 000 0. 267 0. 265 0. 070 0. 019 0. 000 0. 311 0. 266 0. 081 0. 015 0. 000 0. 356 0. 267 0. 093 0. 016 0. 000 0. 900 0. 269 0. 105 0. 017 0. 000 0. 949 0. 270 0. 117 0. 018 0. 000 0. 989 0. 271 0. 129 0. 018 0. 000 0. 533 0. 273 0. 141 0. 019 0. 000 0. 578 0. 274 0. 153 0. 020 0. 000 0. 622 0. 275 0. 165 0. 021 0. 000 0. 667 0. 277 0. 178 0. 021 0. 000 0. 711 0. 278 0. 190 0. 022 0. 000 0. 756 0. 279 0. 202 0. 023 0. 000 0. 800 0 .281 0. 215 0. 029 0. 000 0. 649 0 .262 0. 227 0 .024 0. 000 0. 889 0 .263 0. 290 0. 025 0. 000 0. 933 0 .285 0. 253 0 .025 0. 000 0. 978 0 .286 0. 265 0 .026 0. 000 l. ozz o .ze7 o. z78 o .oz7 0. 000 1. 067 0 .289 0. 291 0 .027 0. 000 1. 111 0 .290 0. 309 0 .028 0. 000 1. 156 0 .291 0. 317 0 .028 0. 000 1. 200 0 .293 0. 330 0 .029 0. 000 1. 299 0 .299 0. 393 0 .029 0. 000 1. 289 0 .296 0. 356 0 .030 0. 000 1. 333 0 .297 0. 369 0 .030 0. 000 1. 378 0 .298 0. 382 0 .031 0. 000 1. 922 0 .300 0. 395 0 .031 0. 000 1. 967 0 .301 0. 909 0 .032 0. 000 1. 511 0 .303 0. 922 0 .032 0. 000 1. 556 0 .309 0. 436 0 .033 0 .000 1. 600 0 .305 0. 999 0 .033 0. 000 1. 699 0 .307 0. 963 0 .034 0. 000 1. 689 0 .308 0. 976 0 .039 0 .000 1. 733 0 .310 0. 990 0 .035 0 .000 1. 779 0 .311 0. 509 0 .035 0 .000 1. 822 0 .313 O. s18 0 .036 0 .000 1. 867 0 .319 0 .532 0 .037 0 .000 1. 911 0 .315 0 .596 0 .039 0 .000 1. 956 0 .317 0. 560 0 .092 0 .000 2. 000 0 .318 0 .574 0 .096 0 .000 2. 094 0 .320 0 .588 0 .050 0 .000 2. 089 0 .321 0 .602 0 .059 0 .000 2. 133 0 .323 0 .617 0 .059 0 .000 2. 178 0 .329 0 .631 0 .069 0 .000 2. 222 0 .326 0 .695 0 .069 0 .000 2. 267 0 .327 0 .660 0 .079 0 .000 2. 311 0 .328 0 .675 0 .060 0 .000 2. 356 0 .330 0 .689 0 .065 0 .000 2. 400 0 .331 0 .709 0 .091 O .OO0 2. 999 0 .333 0 .719 0 .097 0 .000 2. 989 0 .339 0 .733 0 .103 0 .000 2. 533 0 .336 0 .798 0 .109 0 .000 v svA n azv n 79"3 n n s n nnn 2. 622 0. 339 0. 778 0.121 0. 000 2. 66'7 0. 390 0. 793 0.127 0. 000 2. 711 0. 392 0. 809 0.133 0. 000 2. 756 0. 393 0. 829 0.139 0. 000 2. 800 0. 395 0. 839 0.195 0. 000 2. 849 0. 396 0. 859 0.152 0. 000 2. 689 0. 398 0. 870 0.159 0. 000 2. 933 0. 399 0. 885 0.167 0. 000 2. 978 0. 351 0. 901 0.175 0. 000 3. 022 0. 352 0. 917 0.227 0. 000 3. 067 0. 354 0. 932 0.431 0. 000 3. 111 0. 355 0. 998 0.721 0. 000 3. 156 0. 357 0. 964 1.076 0. 000 3. 200 0. 358 0. 980 1.987 0. 000 3. 294 0. 360 0. 996 1.996 0. 000 3. 289 0. 361 1. 012 2.499 0. 000 3. 333 0 .363 1. 028 2.993 0. 000 3. 378 0 .365 1. 099 3.579 0. 000 3. 922 0 .366 1. 060 9.190 0. 000 3. 967 0 .368 1. 077 9.639 0. 000 3. 511 0 .369 1. 093 5.520 0. 000 3. 556 0 .371 1. 109 6.232 0. 000 3. 600 0 .372 1. 126 6.973 0. 000 3. 694 0 .379 1. 192 7.791 0. 000 3 .689 0 .375 1. 159 6.536 0. 000 3 .733 0 .377 1. 176 9.358 0. 000 3 .778 0 .379 1. 193 10.20 0. 000 3 .822 0 .380 1. 209 11.08 0. 000 3 .667 0 .382 1. 226 11.97 0 .000 3 .911 0 .383 1. 243 12.89 0 .000 3 .956 0 .385 1. 260 13.83 0 .000 4 .000 0 .386 1. 276 19.79 0 .000 ANALYSIS RESULTS Flow Frequency Return Periods for Predeveloped Return Period Flow (cfa) 2 yeaz 0. 071268 5 year 0. 111756 10 year 0. 137005 25 yeaz 0. 166962 50 year 0. 186565 100 year 0. 205152 Flow Frequency Return Periods fox Developed Unmitigated Return Period Flow (c£s) 2 yeaz 0. 517409 5 year 0. 626196 10 year 0. 693269 25 yeaz 0. 774042 50 year 0. 831898 100 year 0. 888158 Flow Frequency Return Periods for Developed Mitigated Return Period Flow (efs) 2 year 0. 053526 5 year 0. 084953 10 year 0. 109269 25 year 0. 194025 50 year 0. 172909 100 year 0. 209405 Yearly Peaks for Predeveloped and Developed-Mitigated Year Predeveloped Developed 1956 0.099 0.069 1957 0.197 0.096 1958 0.091 0.029 1959 0.098 0.058 1960 0. 109 0. 136 1961 0. 077 0. 068 L96J 0. 029 0. 029 1963 0. 129 0. 089 1969 0. 081 0. 059 1965 0. 078 0. 03s L966 0. 037 0. 033 1967 0. 086 0. 059 1968 0. 069 0. 031 L969 0. 029 0. 031 1970 0. 069 0. 077 1971 0. 091 0. 085 1972 0. 192 0. 1.31 1973 0. 069 0. 105 1979 0. 051 0. 059 ]975 0. 039 0. 031 1976 0. 100 0. 089 1977 0. 011 o. DZ6 1978 0. 070 o. o7s 1979 0. 069 0. 029 1980 0. 067 0. 065 1981 0. 092 0. 051 1982 0. 063 0. 057 1983 0. 119 0. 036 1984 0. 083 0. 032 1985 0. 029 0. 031 1986 0. 190 0. 075 1987 0. 110 0. 126 1988 0. 091 0. 053 1989 0. 051 0. 030 1990 0. 192 0. 079 1991 0. 187 0. 186 1992 0. 041 0. 035 1993 0. 029 0. 027 1999 0. 029 0. 026 1995 0. 089 0. 062 1996 0. 147 0. 083 1997 0. 079 0. 080 1996 0. 058 0. 032 1999 0. 101 0. 122 Rax+ked Yearly Peaks for Pradaveloped and Developed-Mitigated tank Predeveloped Developed 1 0. 1866 0. 1865 2 0. 1972 0. 1355 3 0. 1969 0. 1310 3 0. 1923 0. 1265 5 0. 1919 0. 1222 6 0. 1397 0. 1046 7 0. 1241 0. 0893 8 0. 1136 0. 0891 9 0. 1102 0. 0850 10 0. 1094 0 .0826 11 0. 1005 0 .0799 12 0. 1003 0 .0790 13 0. 0995 0 .0767 L9 0. 0918 0 .0751 15 0. 0906 0 .0797 16 0. 0887 0 .0690 l7 0. 0878 0 .0680 18 0. 0830 0 .0697 19 0. 0808 0 .0622 20 0. 0789 0 .0595 ?1 0. 0780 0 .0590 22 0. 0770 0 .0569 23 0. 0709 0 .0578 ?9 0. 0695 0 .0568 25 0. 0691 0 .0526 26 D. 0670 0 .0513 27 0. 0695 0 .0955 ?8 0. 0639 0 .0361 29 0. 0633 0 .0359 0. 0585 0. 0352 0. 0507 0. 0326 0. 0506 0. 0329 0. 0979 0. 0321 0 .0419 0. 0319 0 .0909 0. 0312 0 .0407 0. 0312 0 .0390 0. 0307 0 .0379 0. 0298 0 .0293 0. 0299 o .oze9 o. oz99 0 .0287 0. 0266 0 .0291 0. 0270 0 .0239 0 .0264 0 .0111 0 .0261 1/2 2 year to 50 year Flow (CFS) Pradev Final Percentage Pasa/Fail ]. 0356 9227 3570 89. 0 Pass J. 0372 3892 2979 76. 0 Pass 0. 0387 3589 2697 73. 0 Pass 0. 0902 3309 2398 72. 0 Pass 7. 0917 3034 2193 72. 0 Pass 0. 0933 2760 1996 71. 0 Pass 0. 0948 2573 1810 70. 0 Pass 0. 0963 2373 1623 68. 0 Pass 0. 0978 2173 1986 66. 0 Pass 0. 0994 1999 1356 68. 0 Pass 0. 0509 1897 1231 66. 0 Pass 0. 0529 1709 1115 65. 0 Pass 0. 0539 1587 1007 63. 0 Pass 0. 0555 1985 909 61. 0 Pass 0. 0570 1368 814 59. 0 Pass 0. 0585 12.59 725 57. 0 Pass 0. 0600 1155 660 57. 0 Pass 0. 0616 1063 615 57. 0 Pass 0. 0631 987 547 55. 0 Pass 0. 0696 913 502 59. 0 Pass 0. 0661 847 960 59. 0 Pass 0. 0676 787 926 59. 0 Pass 0. 0692 722 388 53. 0 Pass 0 .0707 669 360 53. 0 Pass 0. 0722 621 326 52. 0 Pass 0 .0737 581 296 50. 0 Pass 0 .0753 536 269 99. 0 Pass 0 .0768 505 296 98. 0 Pass 0 .0783 969 233 99. 0 Pass 0 .0798 929 229 52. 0 Pass 0 .0814 387 211 59. 0 Pass 0 .0829 360 201 55. 0 Pass 0 .0899 339 185 59. 0 Pass 0 .0859 317 170 53. 0 Pass 0 .0675 296 160 59. 0 Pass 0 .0890 270 146 59 .0 Pass 0 .0905 255 139 59 .0 Pass 0 .0920 238 132 55 .0 Pass 0 .0936 229 130 58 .0 Pass 0 .0951 217 123 56 .0 Pass 0 .0966 200 115 57 .0 Pass 0 .0981 192 111 57 .0 Pass 0 .0997 180 106 58 .0 Pass 0 .1012 169 100 59 .0 Pass 0 .1027 163 99 60 .0 Pass 0 .1092 155 92 59 .0 Pass 0 .1058 196 89 60 .0 Pass 0 .1073 134 85 63 .0 Pass 0 .1066 125 81 69 .0 Pass 0 .1103 119 77 67 .0 Pass 0 .1119 108 75 69 .0 Pass 0 .1134 103 68 66 .0 Pass 0 .1199 94 69 68 .0 Pass 0 .1164 91 59 69 .0 Pass 0 .1180 84 52 61. 0 Pass 0 .1195 78 98 61. 0 Pass 7 .1210 72 92 58. 0 Pass ) .12.25 67 35 52. 0 Pass 0 .1291 65 33 50. 0 Pass 0 .1256 58 31 53. 0 Pass ) .1271 56 25 99. 0 Pass 0 .1286 51 25 99. 0 Pass 0 .1302 97 23 46. 0 Pass ) .1317 92 18 92. 0 Pass J .1332 37 18 98. 0 Pass 0 .1397 36 16 99. 0 Pass 0 .1363 32 19 43. 0 Pass ) .1378 29 13 49. 0 Pass 0. ].393 26 12 96. 0 Pass 0. 1908 29 12 50. 0 Pass 7 .1924 20 11 55. 0 Pass J .1439 19 11 57. 0 Pass 0. 1954 17 11 64. 0 Pass 9. 1969 19 10 71. 0 Pass 7. 1985 12 10 83. 0 Pass 0. 1500 12 10 83. 0 Pass 0. 1515 11 6 72. 0 Pass 7. 1530 10 6 80. 0 Pass 0. 1595 10 B 80. 0 Pass 0. 1561 10 7 70. 0 Pass 9. 1576 9 7 77. 0 Pass 8. 1591 8 7 87. 0 Pass 0. 1606 8 7 87. 0 Pass 0. 1622 7 6 85. 0 Pass 7. 1637 7 6 Bi 0 Pass 0. 1652 6 6 100 .0 Pass 0. 1667 5 5 100 .0 Pass 0. 1683 5 9 80. 0 Pass 0. 1696 5 9 60. 0 Pass 0. 1713 9 3 75. 0 Pass 0. 1728 9 3 75. 0 Pass 7. 1749 9 3 75. 0 Pass 0. 1759 3 3 100 .0 Pass 0. 1779 3 2 66. 0 Pass 0. 1769 3 2 66. 0 Pass 0. 1805 2 2 100 .0 Pass 0. 1820 2 2 100 .0 Pass 0. 1835 1 1 100 .0 Pass 0. 1850 1 1 100 .0 Pass 0. 1866 1 0 .0 Pass Aatez Quality ffifP Flor and Volume. On-line facility wlume: 0.1165 a e-feet On-13na facility Taxgat Flor: 0.0639 cfe. Pdjvated fox 15 mvn 0.0634 ete. Jff-line Facility tazget flox: 0.035> cfe. xdjvated Fox 15 mm. 0.03P cfe. This program antl a ompanying documentation is prpvitletl - without warranty of any kivd. The entire risk regarding the performance andcr salts of this program i umed by Theeuser. Clear Creek Solutions and the Washington State Department of Ecology disclaims all v uavties, neither expressed o implietl, including but not limited to implied anties of program antl a ompanying documentation. In n ent shall Clear Creek Solutions antl/or the Washington State Department of Ecologytbe liable for any tlamages vha[soever (including without limitation [o damages £or loss of s pmfi CS, loss of business information, business interruption, antl the like) a ing out of the u e of, o nabil ity to use this program a if Clear Creek Solutions or the Washington State Department of Ecologyshas been atlvisetl of the possibi l.ity of such tlamages. Trapezoidal Balei:l Length 65 ft Width IS ft side slope 1 ~ side slope 1 ~ side slope 2 3 side slope 2 0 Base elevatic 290.00 ft Req Volume O.I 165 ac ft 5074.74 cf Vol i>ine Elevation cf ac*ft 290.00 0 0.0000 290.50 549 0.0126 291.00 1224 0.0281 291.50 2033 0.0467 292.00 2985 0.0685 292.50 4087 0.0938 293.00 5348 0.1228 293.10 5620 0.1290 293.20 5899 0.1354 293.30 6185 0.1420 293.40 6477 0.1487 293.50 6776 0.1556