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Preliminary Drainage & Erosion Control Report Longmire Meadows Preliminary Drainage and Erosion Control Report Prepared for: TEBO Venture III 157 Lemieux Lane Tenino, WA 98589 (360) 264-6355 '~ Date: November 10, 2000 Prepared by: Kevin O'Neil, Project Engineer Reviewed by: Steven D. Hatton, P.E. HATTON GODAT PANTIER 2708 Westmoor Court SW Olympia, WA 98502 (360) 943-1599 HGP Project # 00-219 E \office\kro\OO-OOO\OO-219\OO-219 DRAINAGE REPORT doc TABLE OF CONTENTS I PROJECT ENGINEER'S CERTIFICATE 1 II THURSTON REGION FACILITY SUMMARY FORM 2 III DRAINAGE REPORT 8 Section 1 - Project Description 8 Section 2 - Existing Conditions 8 Section 3 - Soils Report 9 Section 4 - Wells & Septic Systems 9 Section 5 - Fuel Tanks 9 Section 6 - Sub-basin Description 9 Section 7 - Analysis of 100-Year Flood 10 Section 8 - Aesthetic Considerations 10 Section 9 - Facility Sizing and Downstream Analysis 10 Section 10 - Covenants, Dedications, & Easements 12 ,Section 11 - Articles of Incorporation 13 IV EROSION CONTROL PLAN 14 A Construction Sequence 14 B Trapping Sediment 15 C Site Restoration 15 D Geotechnical Analysis 15 E Inspection Sequence 15 V STORM DRAINAGE SYSTEM OPERATION & MAINTENANCE PLAN 16 Appendix A - Soils Analysis Appendix B - Tributary Sub-Area Map Appendix C - HYDRA Analysis, 100-Year, 24 Hour Storm I. PROJECT ENGINEER'S CERTIFICATE "I hereby certify that this Drainage and Erosion Control Plan for LONGMIRE MEADOWS, VAN TRUMP STREET, CITY OF YELM, WASHINGTON, has been prepared by me or under my supervision and meets minimum standards of CITY OF YELM and normal standards of engineering practice I understand that the Jurisdiction does not and will not assume liability for the sufficiency, suitability, or performance of drainage facilities designed by me " .,'1. HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 1 II. THURSTON REGION FACILITY SUMMARY FORM Complete one for each facility (detention/retention, coalescing plate filter, etc.) on the project site. Attached 8 1/2 x 11 sketch showing location of facility. Proponent's Facility Name or Identifier (e.g. Pond A): Infiltration pond Van Trump Street NIA N/A 22719231600 22719230900 Name of Road or Street to Access Facility: Hearings Examiner Case Number: Development Rev. Project No/Bldg. Permit No.: Parcel Number: P9rcel Number Status, (num, 1 ch) 0, Known, 1, Public, 2, Unknown, 3, Unassigned Basin and Sub-basin (num, 6 ch) (2ch for basin, 2ch for sub-basin, 2ch future) Responsible jurisdiction (alpha, 1ch) (O)lympia, (C)ounty, (T)umwater, (L)acey To be completed by Utility Staff Utility Facility Number Part 1 - Proiect Name and Prooonent: Project Name: Project Owner: Project Contact: Address: Phone: Project Proponent: (if different) Address: Phone: Project Engineer: Firm: Hatton Godat Pantier Longmire Meadows TEBO Ventures III Mr. Robert Bussey 157 Lemieux Lane; Tenino, WA (360) 264-6356 Steven D. Hatton, P.E. Phone: (360) 943-1599 HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 2 Part 2 - Project Location: Section 19 17 N 02W Township Range Name and Addresses of Adjacent Property Owners: Rossa, Edward J. 404 Longmire Street; Yelm, WA 985.97 P.O. Box 727; Yelm, WA 98597 Baker, Virgil R. Part 3 - Type of Permit Aoplication: Type of Permit (e.g., Commercial Bldg.): Preliminary Plat Approval Other Permits (circle): DOFfW HPA COE Wetlands FEMA Shoreline Management Encroachment COE 404 DOE Dam Safety Floodplain RockeryfRetaining Wall Gradin9 Other Other Agencies (Federal, State, Local, etc.) that have had or will review this Drainage and Erosion Control Plan: None HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 3 Part 4 - Prooosed Project Descriotion: What stream basin is the project in (e.g., Percival, Woodland): Yelm Creek Zoning ............... Moderate Density Residential, R-6 On-Site: Residential Subdivision: Number of Lots 23 0.11 Lot Size (average, acres) Building Permit/Commercial Plat: Building(s) Footprint, acres Concrete Paving, acres Gravel Surface, acres Lattice Block Paving, acres Public Roads (including gravel shoulder), acres: 1.18 Private Roads (including gravel shoulder), acres: 0 On-Site Impervious Surface Total, acres: 2.65 HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 4 Part 5 - Pre-Develooed Project Site Characteristics: Stream through site y /n ....................... No Name: .................. N/ A DNR Type: ............ N/A Type of feature this facility discharges to (i.e., lake, stream, intermittent stream, pothole, roadside ditch, sheetflow to adjacent private property, etc. : No Discharge Swales, Ravines y/n N Steep Slopes, (steeper than 10%) y/n N Erosion Hazard, y/n y 100-Year Floodplain, y/n N ,'"'- Wetlands, y/n N Seeps/Springs, y/n N High Groundwater Table, y/n N Other HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 5 Part 6 - Facilitv Descriotion: Total Area Tributary to Facility Including Off-Site (acres) ............. 3.80 Total On-Site Area Tributary to Facility (acres).............................. 2.80 Design Impervious Area Tributary to Facility (acres)..................... 2.65 Design Landscaped Area Tributary to Facility (acres) .................... 1.15 Design Total Tributary Area to Facility (acres)............................... 3.80 Enter 1 for the Type of Facility: Wet Pond Detention 1 Wet Pond Water Surface Area, Acres Dry Pond Detention Underground Detention '3, Infiltration Pond Dry Well Infiltration Coalescing Plate Separator Centrifuge Separator Other 1 Outlet Type (Enter 1 for Each Type Present): Filter Oil/Water Separator Single Orifice Multiple Orifice Weir Spillway Pump(s) Other 1 HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 6 Part 7 - Release to Groundwater: Design Percolation Rate to Groundwater (if applicable): 15 inch/hour Part 8 - Release to Surface Water (if aoolicable): N/A Thurston County MSL Elevation (ft.) Percent Design Full Volume (cu. ft.) Discharge To Surface Water (ds) Empty: o 25 50 100 HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 7 III. DRAINAGE REPORT Section 1 - Project Description The project proponent is applying for preliminary plat approval for the proposed plat of Longmire Meadows The project site address is 506 Van Trump Avenue The tax parcel numbers for the project site are 22719231600 and 22719230900 The site is zoned Moderate Density Residential (R-6) This project will create 23 single-family residential lots on 3 79 acres of land In addition to the lots, an open space tract will be established for the wetpond and infiltration pond The storm drainage system will consist of catch basins to collect the surface water runoff from the streets, conveyance piping, treatment wet ponds and an infiltration pond The sizing calculations for these facilities are in Section 9 Below is a summary of the tributary areas to the proposed drainage facilities Project Areas Total Tributary Area Total Rooftop Area Total Driveway Area Total Street Area 3 80 Ac 1 05 Ac o 42 Ac 1 18 Ac Total Impervious Area Total Pervious Area 2 65 Ac 1 15 Ac This project will use Best Management Practices (BMP's) throughout the project to control erosion during and after construction along with construction of treatment facilities to enhance the water quality of the surface water runoff from the completed project Some of the erosion control measures that will be used include the installation of a filter fabric fences, construction entrances and other such methods as deemed necessary to control erosion All disturbed soils will be seeded upon completion of the grading actives with a grass seed mixture Section 2 - Existing Conditions The site is currently developed with one single-family home and scattered trees of various size and species The property is bordered by existing City streets The HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 8 property slopes from all sides to a low area in the center of the property This is a localized low area rather than a regional low area There are no creeks, lakes, ponds, streams, ravines, steep slopes or other environmentally sensitive areas on or adjacent to the site This project site is located in a Category I Aquifer Recharge area as mapped by Thurston County There are no drains, channels, swales or other drainage facilities that drain onto or across the site Section 3 - Soils Report Pacific Rim Soil and Water performed the soils analysis for this project They dug 3- test pits in the open space tract where the ponds will be located A Spanaway gravelly sandy loam was encountered Pacific Rim's report is in Appendix A Section 4 - Wells & 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(s) 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(s) 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(s) 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(s) have been shown on the plans Section 6 - Sub-basin Description The project site is located in the Yelm Creek sub-basin of the Nisqually drainage basin as mapped by Thurston County. HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 9 The drainage system between the project site and the Yelm Creek is overland sheetflow There is a mixture of developed single-family lots and undeveloped properties along this flow path There no emergency services located along the flow path There are no known hazardous materials that are or will be handled in the tributary area of the drainage facilities Section 7 - Analysis of 100-Year Flood The Federal Emergency Management Agency prepares maps for all areas within Thurston County, including the incorporated cities therein Panel # 355 depicts the areas, if any, subjected to flooding in the vicinity of this proposal By inspection of this map, this proposal appears to be located in Zone C, an area of minimal flooding This area, therefore, is not located within the 100-year flood plain Section 8 - Aesthetic Considerations All aoove ground stormwater facilities will be hydroseeded upon completion In addition, the water quality wet pond will be planted with a variety of wetland species both in the permanent pool and along the fringes of the permanent water surface 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 9 - Facility Sizing and Downstream Analysis The stormwater facility for the project will function by the storm water sheet flowing from the yards and paved areas to the catch basins and conveyed to the retention pond where it will infiltrate into the soil Prior to the runoff entering the retention pond it will flow through a wet pond for removal of the Total Suspended Solids and oil/water separation This project has been designed per the requirements of the Stormwater Management Manual for the Puget Sound Basin 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 Following is a list of criteria and constraints used in the overall design HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 10 DESIGN STORM RAINFALL AMOUNTS 6-month, 24-hr 2-year, 24-hr 25-year, 24-hr 100-year, 24-hr 1 79 inches 2 80 inches 5 10 inches 6 15 inches Below is a summary of the tributary area to the proposed drainage facilities Proiect Areas Total Tributary Area Total Rooftop Area Total Driveway Area Total Street Area 3 80 Ac 1 05 Ac o 42 Ac 1 18 Ac Total Impervious Area Total Pervious Area 2 65 Ac 1 15 Ac Treatment Facilitv Treatment of the surface water runoff will be provided with two wet ponds The volume of runoff from a 6-month, 24-hour storm event as modeled with HYDRA is a total of 16,099 c f for the entire project The total volume of the wet ponds is 16,129 c f The Northerly wet pond that receives runoff from Coates Street will have a baffle place in the pond to maximize the distance between the pond inlet and outlet to avoid short-circuiting of the runoff. 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 = 15 inches per hour The pond bottom area is 6,100 square feet HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 11 Qp= 15 in x 1 ft x 1 hr x 6,100 sq ft 1 hr 12 in 3,600 sec Qp= 2 11 cfs Stage/discharge relation of the retention pond is as follows STORAGE VOLUME WATER WATER PER CUMULATIVE SURFACE SURFACE UNIT STORAGE ELEVATION AREA AREA VOLUME Q-OUT 338 00 6,100 sf 0 cf 2 11 cfs 3,210 cf 338 50 6,744 sf 3,210 cf 2 11 cfs 3,532 cf 339 00 7,389 sf 6,742 cf 2 11 cfs 3,856 cf 339 50 8,041 sf 10,598 cf 2 11 cfs ,\ 4,182 cf 340 00 8,693 sf 14,780 cf 2 11 cfs The HYDRA model indicates that the Peak storage volume required is 8,017 cubic feet for a 100-year, 24-hour storm event This volume is achieved at a high water elevation of 339 16 The total available storage volume in the pond is 14,780 cubic feet at elevation 340 00 Section 10 - Covenants, Dedications, & 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 grant 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 the property owners, their heirs, successors, and assigns HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 12 Section 11 - Articles of Incorporation All residential subdivisions shall form a Homeowner's Association for the purpose of assigning responsibility and liability for the operation and maintenance of stormwater facilities jointly serving lots within the subdivision The association is not required for facilities that serve a single property owner Articles of Incorporation shall be developed for the association and submitted to the governing body prior to final project approval HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 13 IV. EROSION CONTROL PLAN A. 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 Perform grading directing site runoff towards the sediment trap prior to discharge from the site 3 Once the site is disturbed, continue operations diligently towards completion 4 Monitor all erosion control facilities, and repair, modify, or enhance as directed or as required HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 14 B. Trapping Sediment Filter fabric fencing shall be installed at the beginning of each phase of construction to perform as temporary sediment traps Protection of offsite 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, mulching disturbed soils, 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 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 C. Site Restoration ,,f. 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) D. Geotechnical Analysis Existing slopes in the area of the stormwater ponds are at a maximum of 6% No embankment is required E. 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 HATTON GODAT PANTIER DRAINAGE REPORT - Longmire Meadows Page 15 V. STORM DRAINAGE SYSTEM OPERATION & MAINTENANCE PLAN STORMWATER MAINTENANCE AGREEMENT WITH ACCOMPANYING STORMWATER FACILITY MAINTENANCE GUIDE " & RESIDENTIAL BEST MANAGEMENT PRACTICES LongmIre Meadows November 10, 2000 APPENDIX K & ATTACHMENTS A & B \ \SERVER\DGN\office\forms\HGA \A TT ACH-A&B-RES-drainreport.doc HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 12 TABLE OF CONTENTS APPENDIX~'~--'STORlViWA::r~:R'MMNtj{N~~F:~A$MJ!;~~{f A;TT AcfiME.'NT"A" :':':ST9RMW ~TJfRfAcI~iTY:MMN:tJt~AN(E~ Gij:ip,E INTRODUCTION YOUR STORMW ATER FACILITIES FACILITY KEY SITE PLAN ................14 19 .............................19 ............................................................. 22 22 23 QUICK LIST ................................................................................................................ 24 MAINTENANCE CHECKLISTS ... ............................................................................................................... ... 25 PONDS CATCH BASINS AND INLETS CONVEYANCE PIPES, DITCHES, AND SWALES GROUNDS AND LANDSCAPING ACCESS ROADS AND EASEMENTS DRYWELLS, FRENCH DRAINS, OR DOWNSPOUTS RESOURCE LISTING LOG SHEET 26 27 28 29 30 31 .....................................32 ............................................................................................................................................ 33 .34 ATTACHMENT "B;" ~,,; RESIDEN'FlAlrBESt'7MANAGEmN'T\FRA€TIC'ES ,.,.... ;w;.".",.C;....,:,,,,^,, ..':._.". ;' - ",';' ';"""'-~,.."'"'-'':-_''' __..;.'.~'_'i.~""'~,.'._k.~._,,_.,.;..;:,,;:..,..,.,( .,."..,;;_,-.....".. c,,' :.,.""',_.,"'..>Ow,:.".."'"...,,(,.,,._..,,<~.'.'A''''''':_.,._":' ,.:,- "'_'_'''. 0':'" \ .. .:.~.,="':"",:".,'::,::.:;::.:.;."_;.~","~.,,.:;,,.,_;_'"'_;',,",_.,,,_,.,.,,_ .. '" POLLUTION PREVENTION FOR HOMEOWNERS PURPOSE RECOMMENDED POLLUTION CONTROL PRACTICES FOR HOMEOWNERS HOUSEHOLD HAZARDOUS WASTES HOUSEHOLD PRODUCT MANAGEMENT AUTOMOTIVE USAGE, CARE AND MAINTENANCE PESTICIDES AND FERTILIZERS HOME REMODELING SEPTIC SYSTEM CARE AND MANAGEMENT REFERENCES GLOSSARY ............................34 34 34 34 35 36 40 43 44 44 45 HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 13 APP,~Nbl'" I(..~ .STC::)"RMvvA1:E rt,!"1A:~J~:JI~ ~:AI}rC E:..A.~RE ~)~'1E'~T Return to. City ofYelm Public Works PO. Box 479 Yelm, W A 98597 RESIDENTIAL AGREEMENT TO MAINTAIN STORMW ATER FACILITIES AND TO IMPLEMENT A POLLUTION SOURCE CONTROL PLAN BY AND BETWEEN CITY OF YELM (HEREINAFTER "JURISDICTION") " AND TEBO Ventures III THEIR HEIRS, SUCCESSORS, OR ASSIGNS (HEREINAFTER "OWNER") GRANTOR: Ventures, TEBO, III GRANTEE: YELM, CITY OF LEGAL DESCRIPTION: NW~, Sec.19, T17N, R2W, W.M. ASSESSOR'S TAX PARCEL NO.. 22719231600 & 22719230900 The upkeep and mamtenance of stormwater facIlIties and the ImplementatIOn of pollutIOn source control best management practices (BMPs) IS essential to the protectIOn of water resources m the CIty ofYelm. All property Owners are expected to conduct busmess m a manner that promotes envIronmental protectIOn. ThIS Agreement contams specIfic proVIsIOns WIth respect to mamtenance of stormwater faCIlItIes and use of pollutIOn source control BMPs. The authonty to reqUIre mamtenance and pollutIOn source control IS provIded m CIty Ordmance 561 and m Development GUldelmes, Chapter 7, Samtary Sewer- "Mamtenance ReqUIred for Pnvate Stormwater Dramage Systems" HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 14 LEGAL DESCRIPTION Block 15 of unrecorded Solberg's Second AddItIon to Yelm, described as follows Begmnmg at mtersectIOn of Westerly lme of Solberg Street wIth the Northerly Lme of Van Trump Street, said pomt bemg North 520 04' West, 50-feet from Southwest comer of Block 1, Solberg's FIrst AddItIon to Yelm, thence North 520 04' West at nght angles to Van Trump Street, 250-feet; Northwesterly and parallel wIth said street 400-feet; Southerly at nght angles to Van Trump Street 250-feet to Northerly hne of said street extended, Southeasterly along extensIOn of Said 400-feet to begmmng. Lymg m SectIOn 19, TownshIp 17 North, Range 2 East, W.M. That part of the Southwest quarter of the Northwest quarter of SectIOn 19, TownshIp 17 North, Range 2 East, W.M. described as follows Begmnmg at a pomt North 37056' East, 170-feet from the most Northerly comer of Solberg's FIrst Add1tlon to Yelm, accordmg to plat recorded m Volume 9 of Plats, page 31, runnmg thence North 520 04' West, 200-feet; thence North 370 56' East, 250-feet to the Southwesterly lme of Coates Street; thence South 52004' East along Southwesterly hne of Coates Street, 200-feet; thence South 37056' West, 250-feet to the pomt ofbegInnmg Whereas, the OWNER has constructed Improvements, mcludmg but not hmIted to, bUll~mgs, pavement, and stormwater facIhtIes on the property described above In order to further the goals of the JunsdIctIOn to ensure the protectIOn and enhancement of Y elm's water resources, the JunsdIctIOn and the OWNER hereby enter mto thIS Agreement. The responsibIhtles of each party to thIS Agreement are IdentIfied below OWNER SHALL (1) Implement the stormwater facIhty mamtenance program mcluded herem as Attachment "A" (2) Implement the pollutIOn source control program mcluded herem as Attachment "B" (3) Mamtam a record (m the form of a log book) of steps taken to Implement the programs referenced m (1) and (2) above The log book shall be aVailable for mspectIOn by appomtment at 157 Lemieux Lane; Tenino, W A 98589 The log book shall catalog the actIOn taken, who took 1t, when 1t was done, how It was done, and any problems encountered or follow-on actIOns recommended. Mamtenance Items ("problems") hsted m Attachment "A" shall be mspected as speCIfied m the attached mstructIOns or more often If necessary The OWNER IS encouraged to photocopy the mdIvIdual checkhsts m Attachment "A" and use them to complete ItS mspectIOns These completed checkhsts would then, m combmatIOn, compnse the log book. (4) SubmIt an annual report to the JunsdIctIOn regardmg ImplementatIOn of the programs referenced m (1) and (2) above The report must be subm1tted on or before May 15 of each calendar year and shall contam, at a m1mmum, the followmg HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 15 (a) Name, address, and telephone number of the busmesses, the persons, or the firms responsible for plan ImplementatlOn, and the person completmg the report. (b) TIme penod covered by the report. (c) A chronologIcal summary of actiVIties conducted to Implement the programs referenced m (1) and (2) above A photocopy of the apphcable sectlOns ofthe log book, wIth any addltlOnal explanatlOn needed, shall normally suffice For any actlvItles conducted by paid partIes, mclude a copy ofthe mVOlce for serv1ces (d) An outhne of planned actIvltles for the next year THE JURISDICTION SHALL (1) PrOVIde techmcal aSSIstance to the OWNER m support of ItS operatlon and mamtenance actlv1tIes conducted pursuant to ItS mamtenance and source control programs. Said aSSIstance shall be proVIded upon request and as JunsdlctlOn time and resources permIt. (2) ReVIew the annual report and conduct a mmlmum of one (1) SIte VISIt per year to dISCUSS performance and problems WIth the OWNER. (3) ReVIew thIS agreement w1th the OWNER and mod1fy 1t as necessary at least once every three (3) years REMEDIES (1) If the Junsd1ctlOn determmes that mamtenance or repair work IS reqmred to be done to the stormwater faclhtles eXlstmg on the property, the JunsdlctlOn shall glVe the owner of the property wlthm whIch the dramage faclhtles are located, and the person m control of Said property, notlce of the speCIfic mamtenance and/or repair reqmred. The DIrector shall set a reasonable time (m most mstances not less than 10 days) m whIch such work 1S to be completed by the persons who were gIven notlce If the above reqmred mamtenance and/or repair IS not completed wlthm the tlme set by the DIrector, wntten notice WIll be sent to the Owner of the property m whIch the dramage faclhtles are located and the person m control of Said property statmg the JunsdlctlOn's mtentlOn to perform such mamtenance and bIll the Owner for all mcurred expenses The JunsdlctlOn may also revoke stormwater utlhty rate credIts for the quahty component or mvoke surcharges to the quantlty component of the Owner bIll If reqmred mamtenance IS not performed. (2) If at any tlme the JunsdIctlon determmes that the eXIstmg system creates any mmnnent threat to pubhc health or welfare, the JunsdlctlOn may take nnmedlate HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 16 measures to remedy sa1d threat. No notIce to the persons lIsted m RemedIes (1), above, shall be reqUIred under such CIrcumstances (3) The OWNER grants unrestncted authonty to the JunsdlctlOn for access to any and all stormwater system features for the purpose of performmg mamtenance or repaIr as may become necessary under RemedIes (1) and/or (2) (4) The persons lIsted m (1), above, shall assume all responsibIlIty for the cost of any mamtenance and for repaIrs to the stormwater facIlIty Such responsibIlIty shall mclude re1mbursement to the JunsdlctlOn wlthm 30 days of the receIpt of the mVOIce for any such work performed. Overdue payments WIll reqUIre payment of mterest at the current legal rate for lIqUIdated Judgements If legal actIOn ensues, any costs or fees mcurred by the JunsdlctlOn WIll be borne by the partIes responsible for SaId reImbursements (5) The owner hereby grants to the JunsdlctlOn a lIen agamst the above described property m an amount equal to the cost mcurred by the Junsd1ctlOn to perform the mamtenance or repaIr work described herem. ThIS Agreement IS mtended to protect the value and des1rabIlIty of the real property described aboye and to benefit all the CItIzens of the JunsdlctlOn. It shall run wIth the land and be bmdmg on all partIes havmg or acqumng from OWNER or ItS successors, any nght, tItle, or mterest m the property, or any part thereof, as well as theIr tItle, or mterest m the property or any part thereof, as well as theIr heIrs, successors, and assIgns. They shall mure to the benefit of each present or future successor m mterest of SaId property or any part thereof, or mterest therem, and to the benefit of all CItIzens of the JunsdlctIon. Owner Owner E. \agency\yelm\forms\APP END IXK - RESstormmaintagr.doc HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 17 STATE OF WASHINGTON ) ) 55 COUNTY OF THURSTON) On th1S day and year above personally appeared before me, known to be the mdIvIdual(s) described, and who executed the foregomg mstrument and acknowledge that he sIgned the same as hIS free and voluntary act and deed for the uses and purposes therem mentlOned. GIven under my hand and offic1al seal thIS day of , 200_ Notary Pubhc m and for the State of Washmgton, resIdmg m My commISSlOn expIres Dated at , Washmgton, th1S day of ,200_ Pubhc Works D1rector STATE OF WASHINGTON ) ) 55 COUNTY OF THURSTON) On th1S day and year above personally appeared before me, known to be the DIrector ofPubhc Works for the CIty ofYelm, a MUnIcIpal CorporatlOn, who executed the foregomg mstrument and acknowledge the sald mstrument to be the free and voluntary act and deed of sald MUnICIpal CorporatlOn for the uses and purposes therem mentlOned and on oath states he IS authonzed to execute the sald mstrument. GIven under my hand and officIal seal thIS day of ,200_ Notary Pubhc m and for the State of Washmgton, resIdmg m My commISSlOn expIres APPROVED AS TO FORM HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 18 ATTACH'MENl' ~'A" ":'", S'TORMWATERFACltIT<Y:MAINTENANCE"Gl:JIOE ~.t:, ',: .. .. .. .. .,,> :.",."(-::' ""':""'" ':.:::',.;~;',',.:..': ,-:,,:. ::;:.:::':.,:::~> ....,.., -... : ,,:~....':_' '.;,;Li.<~..:' :....,,: ':,,;";!-'.').,:,->. :x ',. ,J~,":: - :, :",j,)., ;:_,~'.;,:;;::,.,.,,:;.:__._;:;': ,;, ';;', "::': ."........,:,: ~:.;::.:,.: ;":':.:,.,i':::"';;';';:";'wC;,;.';j;;:,..:::'.:,':;J.'i;,:h;.,;;",;::':""::,"~';:':,~^'~,:".,' .""..C,...""" INTRODUCTION What is SJ;ormw~ter Runoff? When urban and suburban development covers the land with buildings, houses, streets and parking lots, much of 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 stormwater runoff making its way into storm drains (including man-made pipes, ditches, or swale networks), storm water ponds, surface and groundwater, and eventually to Puget Sound What is a Stann Drain System ~nd how does it wQrk? The storm drain system for most developments includes components that carry, store, cleanse, and release the stormwater These components work together to reduce the impacts of development on the environment These 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 ':'1', 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 The ponds also store the treated water, releasing it gradually to a nearby stream or to groundwater The various components of storm drain systems are described in the glossary What does Stormwater Runoff have to dQ with W~ter Quality? Stormwater runoff needs to 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 must be treated before it can be used 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 NeighbQrhood Stonnw~ter Facility Stormwater facilities can be attractive as well as functional They can provide both active and passive-use recreation areas and open space for wildlife Perhaps you've noticed a wet pond or dry pond in your neighborhood These different types of ponds are designed for different purposes For example, wet ponds primarily provide treatment of stormwater They also provide good cover and habitat for birds and small mammals, making them fine "wildlife preserves" HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 19 Dry ponds or infiltration ponds are designed to provide storage for stormwater and gradually release it downstream or allow it to filter into the ground These types of ponds can be maintained as grassy play areas, and may even house formal play equipment Who is RespOnsible for M~in@ining Stonnwater Facilities? All stormwater facilities need to be maintained Regular maintenance ensures proper functioning and keeps the facility visually appealing This Stormwater Facility Maintenance Guide was designed to help explain how stormwater facilities work and provide user-friendly, straightforward guidance on how to maintain them As a homeowner or homeowner's association, you are responsible for regularly maintaining privately owned ponds, catch basins, pipes and other drainage facilities within your subdivision Stormwater facilities located in public right-of- ways are maintained by local governments How to Use the Stormw~ter Facility Mainten~nce 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 n'elp you identify the more routine needs for your facility ThiS Guide In(;llJdes: A Glossary that defines terms and explains functions of the various components of stormwater drainage systems, A comprehensive Maintenance Checklist that provides specific details on required maintenance, A section on Pollution Prevention Tips that lists ways to protect water quality and keep storm drain systems functioning smoothly, And a section on Resources that directs you to sources of more information and technical assistance A Region~1 Approach to stQn11water M~nagement 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 HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 20 This Guide focuses on providing information on ways that residents and businesses can reduce stormwater impacts through pollution prevention and proper facility maintenance Everyone needs to help keep waterways and groundwater clean With proper management and common sense, we can continue to enjoy clean, safe streams and drinking water HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 21 YOUR STORMWATER FACILITIES This section consists of two parts that are to be used together the Facility Key and the Site Plan Look on the site plan and identify the numbers denoting a feature of the system Then look on the facility key to see what that feature is called and which checklist applies FACILITY KEY The stormwater facility in your neighborhood is comprised of the following elements " Type of Feature & Checklist Name Location on, Site Plan Infiltration Trench Pond 1 Catch Basins, Manholes, and Inlets 2 Filter Strip Grounds and Landscaping Conveyance Pipes, Ditches, and Swales 3 Drywells, French Drains, or Downspouts See individual lot site plan Access Roads and Easements HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 22 SITE PLAN " " HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 23 QUICK LIST The following list is an abbreviated checklist of the most common types of maintenance you should have to do Please try and go over this checklist after heavy rains This is a bare minimum and should be done in conjunction with the other checklists in order to make your maintenance program effective o Check 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 o Check inlet and outlet pipes for blockages Clear all blockages o Check filter strip, swale and pond walls for erosion or caved in areas o Check riprap (rocks) at the inlets and outlets of culverts and other pipes If they are silted in or eroded away, replace them HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 24 MAINTENANCE CHECKLISTS The Maintenance Checklists in this packet are for you to use when checking the stormwater facilities in your neighborhood 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 developer or local jurisdiction The checklists are in tabular format for ease of use and brevity Each checklist tells you what part of the feature to check, how often to check it, what to check for, and what to do about it Log sheets are included toward the end of the chapter to help you keep track of when you last surveyed the 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 These tools include 03 A flashlight 03 A long pole or broom handle 03 Some kind of pry bar or lifting tool for pulling manhole and grate >, covers 03 Gloves A listing of resources 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 contractor and consultants that designed and constructed your facilities SAFETY WARNING Due to 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 pole or broom handle that is long enough when you are checking sediment depths in confined spaces NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF THE OPEN HOLE HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 25 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 is an infiltration pond Part of When Pond to to What to Check For What to Do Check Check it Entire Pond Quarterly Dumping of yard wastes such as grass clippings Remove trash and debris and dispose of and branches into basin. Presence of glass, properly plastic, metal, foam, and coated paper Entire Pond Quarterly Any vegetation that may constitute a hazard to the Remove invasive or noxious vegetation Do public, such as tansy ragwort, poison oak, not spray chemicals on vegetation without stinging nettles, devilsclub obtaining guidance from WSU Cooperative Extension and approval from the City or County Entire Pond Quarterly Presence of chemicals such as natural gas, oil, First, try and locate the source of the and gasoline obnoxious color, odor, or sludge. pollution. Then call the Moderate Risk Waste program at Thurston County Environmental Health to report the hazard Entire Pond Quarterly Sparse weedy, or overgrown grass in grassy For grassy ponds, selectively thatch, aerate, (dry/infiltration) ponds. Presence of invasive and re-seed ponds. Grass should be kept species or sparse growth of plants in wet ponds. less than 8 inches high For wet ponds, hand-plant nursery-grown wetland plants in bare areas. Contact WSU Cooperative Extension for guidance on invasive species. Pond bottoms should have uniform dense coverage of desired plant species. Entire Pond Quarterly Any evidence of rodent holes if your facility is Destroy rodents and repair the dam or berm. acting as a dam or berm, Water should not be Contact the Thurston County Health able to flow throuah rodent holes, Department for auidance. Entire Pond Quarterly Insects such as wasps and hornets interfering Destroy or remove insects. Contact WSU with rnaintenance activities, or rnosquitoes Cooperative Extension for guidance. becomina a nuisance. Entire Pond Annually Ensure that trees are not interfering with Prune tree limbs to allow for maintenance. maintenance (i.e" mowing, silt removal, or Sorne trees rnay be cut for firewood access, ) Inlet Annually Make sure that the nwap under the Inlet pipe IS Replace rocks or clean out sediment. intact and that no na ive soil is exposed. Also check for accumulations of sediment more than Y, the height of the rocks. Outlet Quarterly The rip rap overflow should be intact and clear of Reprace np rap It missing. Kemove any trasff debris. Water should be able to flow freely of debris and dispose of properly throuah overflow Side Slopes Annually Check around inlets and outlets for signs of Try and determine what has caused the erosion Check berms for signs of sliding or erosion and fix it. Stabilize slopes by settling. Action is needed where eroded damage reinforcing the slope with rock, planting is over 2 inches deep and where there is potential grass, or compacting the soil. Contact WSU for continued erosion Cooperative Extension for guidance on slope reinforcement. Storage Area Annually Check to see if sediment is building up on the Clean out the sediment and re-seed the pond bottom. A buried or partially buried outlet pond if deemed necessary to improve structure or very slow infiltration rate probably infiltration and control erosion indicates sianificant sediment deposits, Dikes Annuallv Anv part of the dike that has settled sianificantlv Build the dike back to the oriainal elevation. Emergency Annually Check to see that the rip rap protective area is Replace rocks so that all native soil is Ove rfl ow/ intact. If any exposed native soil is present you covered. Spillwav should repair it. Trench Drain Quarterly Check to see that the grate is clear of debris, and Remove debris from grate, clean drain. that the drain is not pluaaed. HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 26 CATCH BASINS 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 the homeowners association is responsible for keeping the grates clear of debris in all areas as well as pipes and catch basins in private areas Part of Catch When to Basin to Check it What to Check For What to Do Check Catch basin During and after Trash or debris accumulating in front of the Remove blocking trash or debris opening major storms catch basin opening and not allowing water to with a rake and clean off the flow in. Qrate. Catch basin Quarterly Sediment or debris in the basin should be kept Clean out the catch basin of under 50% of the depth from the bottom of the sediment and debris. pipe to the bottom of the basin. Use a long stick or broom handle to poke into sediment and determine depth. Inlet and outlet Quarterly Trash or debris in the pipes should not be more Clean out inlet and outlet pipes pipes than 1/5 of its height. Also, there should not be of trash or debris. any tree roots or other vegetation growing in the oioes. Inlet and outlet pipe Annually There should be no cracks wider than Y, inch Repair cracks or replace the joints and longer than 1 foot at the joint of any inlet or joints. outlet pipe. Also check for evidence of ..' sediment entering the catch basin through cracks. Grate Quarterly The grate should not have cracks longer than 2 Replace the grate. inches. There should not be multiple cracks. Frame Quarterly Ensure that the frame is sitting flush on top of Repair or replace the frame so it the concrete structure (slab). A separation of is flush with the slab more than :y.. inch between the frame and the slab should be corrected Catch basin Annually Inspect the walls of the basin for cracks wider Replace or repair the basin. than Y, inch and longer than 3 feet. Also check Contact a professional engineer for any evidence of sediment entering the for evaluation. catch basin through cracks. Determine whether or not the structure is sound. Catch basin Quarterly There should be no chemicals such as natural Clean out catch basin. Contact gas, oil, and gasoline in the catch basin. your local jurisdiction or Check for obnoxious color odor or oily sludge. Thurston County Environmental Health if you detect a color, odor, or oily sludge. Oil/Water separator Quarterly Water surface in catch basin has significant Remove the catch basin lid and \dOwnturned sludge, oil, grease or scurn layer covering all skim off oil layer Pour oil into a e bow or "T" in or most of the water surface. disposable container seal catch basin) container, wrap securely in newspaper, and place in trash Water surface should be clear of oily layer Pipe Elbow Quarterly Top or bottom of pipe appears to have broken Remove the catch basin lid and off Check for any aftparent damage and examine the pipe for damage. If check to see if it is p umbo broken, hire a contractor to replace pipe in accordance with approved Jjlans on file with your local juris iction. HATTON GODAT, PANTIER &. ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 27 CONVEYANCE PIPES, DITCHES, AND SWALES Part of When to What to Check For What to Do System to Check it Check Pipes Annually Accumulated sediment should not exceed 20% Clean out pipes of all of the diameter of the pipe. Vegetation should sediment and debris. not reduce free movement of water through Remove all vegetation so pipes. Ensure that the 8rotective coating is not that water flows freely damaged and rusted ents should not through pipes. Repair or Significantl~ impede flow Pipe should not have replace pipe. major crac s or tears allowing water to leak out. Open ditches Quarterly There should not be any yard waste or litter in Remove trash and debris the ditch. and dispose of them properly Open ditches Annually Accumulated sediment should not exceed 20% Clean out ditch of all of the depth of the ditch sediment and debris. Open ditches & Annually Check for ve~etation (e.g., weedy shrubs or Clear blocking vegetation so Swales saplin~s) tha reduces the free movement of that water flows freely water hrough ditches or swales. through ditches. GrassI; vegetation should be Ie alone Open ditches & Quarterly Check around inlets and outlets for signs of Eliminate causes of erosion. Swales erosion Check slopes for signs of SIOu~hing Stabilize slopes by using or settling. Action is needed where ero ed appropriate erosion control damage IS over 2 inches deep and where there measures (e.g , reinforce .. is potential for continued erosion. with rock, plant grass, compact soiL) Open ditches & Annually Native soil beneath the rock splash pad, check Replace rocks to design Swales dam, or lining should not be Visible. standard. Swales Quarterly Grass cover is sparse and weedy, or areas are Aerate soils and reseed and overgrown with woody vegetation. mulch bare areas. Keep grass less than 8 inches high Remove woody growth, regrade, and reseed as necessary Swales Quarterly Swale has been filled in or blocked by shed, If possible, speak with woodpile, shrubbery etc. homeowner and request that the swale area be restored. Swales Annually Water stands in swale or flow velocity is very A survey may be needed to slow Stagnation occurs. check grades. Grades need to be in 1-5% range if ftossible. If grade is less han 1 %, underdrains may need to be installed HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 28 GROUNDS AND LANDSCAPING Part of When to Grounds to Check it What to Check For What to Do Check Landscaped Quarterly Weeds growing out of control in landscaped Pull weeds by hand, if Areas area. possible, to avoid using chemical weed controls. Landscaped Quarterly Check for any presence of poison ivy or other Remove poisonous vegetation Areas poisonous vegetation or insect nests. or insect nests that are present in landscaped area. Landscaped Quarterly There should not be any yard waste or litter in Remove and dispose of litter Areas landscaped areas. properly Landscaped Quarterly Noticeable rills are seen in landscaped areas. Identi~ the causes of erosion Areas and ta e ste~s to slow down or disperse t e water Fill in contour, and seed area. Trees and Annually Limbs or parts of trees or shrubs that are split Trim trees and shrubs to shrubs or broken. restore shape. Replace severely damaged trees and shrubs. Trees and Annually Trees or shrubs that have been blown down or Replant trees or shrubs, shrubs knocked over inspecting for injury to stem or roots. Replace If severely damaged. Trees and Annually Trees or shrubs that are not adequately Place stakes and rubber- Shrubs supported or are leaning over, causing coated ties around young exposure of the roots. trees/shrubs for support. HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 29 ACCESS ROADS AND EASEMENTS Area to When to What to Check For What to Do Check Check it General One Time Check to determine if there is enough If there is not enough access to your stormwater facilities for access, check with your maintenance vehicles local jurisdiction to determine whether an easement exists. If so, a maintenance road may need to be constructed there Access road Quarterly Debris that could damage vehicle tires Clear all potentially (glass or metal) damaging debris Access road Annually Any obstructions that reduce clearance Clear along and over above and along the road to less than 14 roadway so there is feet. enough clearance Road surface Annually Check for potholesr ruts, mush'b spots, or Add Jravel or remove woody debris that imit access y woo as necessary maintenance vehicles. Shoulders and Annually Check for erosion along the roadway Repair erosion with ditches additional soil or gravel HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 30 DRYWELLS, FRENCH DRAINS, OR DOWNSPOUTS Each lot is required to have an onsite drywell for onsite improvements Part of When to System to Check it What to Check For What to Do Check Downspout Annually Water overflows from the downspout over the First try cleaning out the ground. Rutters and downspouts. f this doesn't solve the problem you may need to Install a bigger drywell. Roof Annually Moss and algae are taking over the shadier Disconnect the flexible parts of the shingles. Feart of the downspout that eads to the drywell Perform moss removal as desired. Pressure wash or use fatty acid solutions instead of highly toxic ~esticides or chlorine leach. Install a zinc strip as a preventative. HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 31 RESOURCE LISTING If you are unsure whether a problem exists, please contact your local jurisdiction at one of the numbers below and ask for Technical Assistance Contact Numbers Lacey Water Resources Olympia Sewer & Stormwater Engineering Tumwater Public Works (Engineering) Yelm Public Works Thurston County (Storm & Surface Water) WSU Cooperative Extension 491-5600 753-8768 754-4140 458-3244 754-4681 786-5445 Developer Information TEBO Ventures III 157 Lemieux Lane Tenino, WA 98589 (360) 264-6355 ,', Engineer's Information Hatton Godat, Pantier & Associates 2708 Westmoor Court, S W Olympia, WA 98502 (360) 943-1599 HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 32 LOG SHEET Use log sheets to keep track of when maintenance checks occur and what items, if any, are repaired or altered The completed sheets will serve as a record of past maintenance activities and will provide valuable information on how your facilities are operating This information will be useful for future requirements regarding the types of facilities that are installed It helps to keep all log sheets in a designated area so others can easily access them Date Checked~~_ Checked By Name: Position in HOA Address: City, State: Zip Phone Number' Part of Observations '. " '" Date '.~, Facility (List things, that FoHow...tip Ac:tions Action' Checked should be done)' Taken I Taken HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 33 At-r!\~H'MENT'.~~B" ~:1.RJ;,~~'i?I;:~1i~E~'~~,S:r:;~1\.N4:GEMJ~Nt;~M~f;r~q~$ POLLUTION PREVENTION FOR HOMEOWNERS PURPOSE Many products and practices commonly used in and around our houses are hazardous to both the environment and us Many of these products can end up in our stormwater systems and groundwater This document gives alternatives, where possible, for those types of products and practices The Best Management Practices (BMPs) described here, include "good housekeeping" practices that everyone can use RECOMMENDED POLLUTION CONTROL PRACTICES FOR HOMEOWNERS It has been said that the average home today contains more chemicals than the average chemical lab of 100 years ago When many of these chemicals are used industrially, they can be subject to various health and safety standards, yet these same substances are used freely and often carelessly in our homes The BMPs in this section are divided into four categories Household Hazardous Wastes, Pesticides, Remodeling, and Septic Maintenance Each section includes information on available alternatives HOUSEHOLD HAZARDOUS WASTES Many of the cleaning agents, solvents, polishes, etc used commonly in the home are considered hazardous These products may be toxic, corrosive, reactive, flammable, and/or carcinogenic It is critical that these products are handled with care and are properly disposed A list of common household hazardous materials is presented in Table 1 In addition, many hazardous household chemicals persist for long periods of time in the environment Manufacturers may truthfully state that a product is "biodegradable", most products are biodegradable, but what is important is the rate at which they are broken down and the products they are broken down into The term "biodegradable" on its own is misleading at best, unless the product is rapidly degraded into harmless substances It is important to note here that the term "biodegradable" currently has no legal definition in this state This means that any product can use this term according to the manufacturer's own definition This definition may not be at all similar to the consumer's perception The following ideas will help you reduce the risks of stormwater and ground water contamination from many household products HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 34 HOUSEHOLD PRODUCT MANAGEMENT 1 Read the label of products before you buy them Toxic product labels will carry many warnings Either bypass such products or buy them in small quantities If you cannot use the entire product, try to give it away instead of disposing of it Thurston County periodically facilitates product exchanges for leftover paints and other hazardous wastes Call the Thurston County Health Department at 754-4111 for more information 2 Buy only those detergents that contain little or no phosphorus Phosphorus can cause algae blooms if it is washed into lakes or streams Most detergents that are low or phosphate free are labeled as such 3 Use no more than the manufacturer's suggested amount of any cleanser More is not necessarily better. ~1. 4 Products such as oven cleanser, floor wax, furniture polish, drain cleaners, and spot removers often contain chemicals that are toxic Buy the least toxic product available, and use a non-toxic substitute if one can be found Ovens, for example, can be cleaned by applying table salt to spills, then scrubbing with a solution of washing soda and water Table 2 lists substitutes for many commonly used household products If it is necessary to use a product that contains toxic chemicals, use the product only as directed Do not combine products, as they may become more dangerous when mixed (example mixing chlorine bleach and ammonia produces dangerous gases) Use eye wear and rubber gloves as appropriate Contact the Hazardous Substance Hotline at 1-800-633-7585 if you have any questions regarding disposal of a product or empty container. The County has both hazardous waste collection days and permanent facilities where residents can bring hazardous wastes Call the Thurston County Health Department at 754-4111 for more information 5 Chemicals left over from some activities, such as photography and auto repair, are hazardous and should not be flushed down the sink This is especially important if your home is hooked up to a septic system Toxic chemicals can kill the bacteria in the tank that treat sewage and pollute water supply wells 6 Be sure that all containers are clearly marked 7 Common (not automobile) batteries are one of the largest sources of heavy metals (such as lead, nickel, cadmium, and mercury) found in HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 3S landfills Instead of throwing them away, dispose of them at a hazardous waste collection site AUTOMOTIVE USAGE, CARE AND MAINTENANCE From a waste management standpoint, automobile maintenance is best done by professionals at facilities designed to handle, store, and dispose of the waste products properly Many of these facilities do an excellent job of dealing with waste oils, antifreezes, other fluids, batteries and tires They often charge a small fee to cover the added expenses, but it's worth it However if you repair your car at home, please consider these helpful tips 1 Cars should be serviced regularly Any leaky lines or valves should be replaced 2 Dumping oil, degreasers, antifreeze, and other automotive liquids into a stream or a storm drain violates city, county and state laws or ordinances Do not dump them onto the ground because they will end up in stormwater runoff or in groundwater Do not use oil to reduce dust levels on unpaved areas Instead, recycle used oil and antifreeze Keep them in separate containers Call the Recycling Hotline at 1-800-RECYCLE or call the Thurston County Health Department for the location of the nearest recycling center, or call your local automotive service centers to see if they take oil for recycling Some may also take used oil filters 3 Wrap empty oil or antifreeze containers in several layers of newspaper, tie securely and place in a covered trashcan Antifreeze is sweet tasting, but poisonous to people, fish, pets and wildlife. 4 Sweep your driveway instead of hosing it down Fluids and heavy metals associated with automobiles can build up on driveway surfaces and be washed into local surface or groundwater when driveways are hosed down 5 When washing vehicles, do so over your lawn or where you can direct soapsuds onto the lawn or another vegetated area to keep the soaps from washing into the storm drain system or local surface water Your stormwater pond cannot cleanse soapy water from washed cars 6 Small spills of oil and other fluids can be absorbed by using materials such as kitty litter or sawdust Wrap the used kitty litter and any contaminated soil in a plastic bag and then place it in the garbage If a spill reaches surface water, you must notify the nearest regional office of the Department of Ecology Immediately! The Southwest Regional Office number is 407-6300 or call 911 There are fines for failure to notify the appropriate agency when a spill occurs HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 36 7 De-icing chemicals (various types of salt) can harm concrete less than three years in age, burn vegetation, and be corrosive to cars and other metal objects De-icing chemicals and their additives can be toxic (Cyanide is formed from the breakdown of a common anti-caking agent used in de-icing chemicals) Urea salts are an alternative to other types of salt de-icers, but great care must be used in applying them These salts contain large quantities of nitrogen, which can severely burn plants and encourage algae growth in lakes and/or puget Sound, if over-applied 8 The use of these chemicals should be minimized or avoided Instead, shovel walks clear and apply a dusting of sand to improve footing HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 37 Table 1 Hazardous Household Substances List 1 Batteries 1 Adhesives, glues, 1 Oven cleaners cements 2 Waxes and cleansers 2 Roof coatings, 2 Degreasers and sealants spot removers 3 Paints, solvents and 3 Caulking and 3 Toilet, drain and thinners sealants septic tank cleaners 4 Additives 4 Epoxy resins 4 Polishes, waxes and strippers 5 Gasoline 5 Solvent-based paints 5 Deck, patio and chimney cleaners 6 Flushes 6 Solvents and thinners 6 Solvent cleaning fluids 7 Auto repair materials 7 Paint removers and strippers 8 Motor oil 9 Diesel oil 10 Antifreeze 1 Insecticides 1 Paints, thinners and 1 Ammunition solvents 2 Fungicides 2 Chemicals (photo and 2 Asbestos pool) 3 Rodenticides 3 Glues and cements 3 Fireworks 4 Molluscicides 4 Inks and dyes 5 Wood preservatives 5 Glazes 6 Moss retardants 6 Chemistry sets 7 Herbicides 7 Bottled gas 8 Fertilizers 8 White gas 9. Charcoal starter fluid Source: Guidelines for Local Hazardous Waste Planning, Ecology, No. 87-18 1987. HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 38 Table 2 Non-Toxic or Less Toxic Alternatives to Toxic Products Hazardous Product Alternativefsl Air fresheners Set out a dish of vinegar or simmer cinnamon and cloves or set out herbal bouquets or potpourri in open dishes or burn scented candles Bleach Borax or oxygen bleaches or reduce bleach by V2 and add V4 - 112 C baking soda, or let clothes dry in the sun Brass polish Worcestershire sauce Chrome polish Apple cider vinegar or a paste of bakinq soda and water or a lemon Coffee pot cleaner Vineqar Coffee stains Moist salt paste Copper cleaner Mix lemon juice and salt or use tomato catsup Drain cleaner Use a plunger followed by V2 C baking soda mixed in V2 C vinegar Let sit 15 minutes, pour down 2 qt boiling , water Furniture polish Linseed, olive or almond oils or a mixture of 3 parts olive oil to 1 part white vinegar or a mixture of 1 Tbs lemon oil and 1 pint mineral oil Garbaqe disposal deodorizer Used lemon rind or bakinq soda Glass cleaner Mix 2 Tbs vineqar with 1 quart water Grease remover Make a paste of borax on a damp cloth Ink stain remover Spray with leftover non-aerosol hair spray before washinq Laundry soap Borax, bakinq soda or washinq soda Linoleum floor cleaner 1 C white vinegar in 2 gals water Mildew remover Equal parts vineqar and salt Mothballs Cedar chips or blocks, or use dried tansy, lavender or peppercorns in drawers and closets Oil spills Kitty litter, sawdust Oil stain removal White chalk rubbed into the stain prior to washinq Oven cleaner Pour lots of salt on fresh spills and scrape off after the oven cools A soda water solution will cut grease Paint ammonia on spills with a paintbrush, then rinse off Paint brush softener Hot vineqar HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 39 Table 2 Non-Toxic or Less Toxic Alternatives to Toxic Products (Cont.) I Hazardous Product I Alternative(s) I Paint stripper Use mechanical sanding instead of chemical strippers Paint/qrease remover Wear qloves or use baby oil Pet odor removal Cider vineqar Pitch or sap remover Butter, margarine or vegetable shorteninq Porcelain stain remover Bakinq soda Refriqerator deodorizer Open box of bakinq soda Rug/carpet cleaner (General) Use a soap-based non- aerosol rug shampoo, vacuum when dry (Spots) Pour on club soda or sprinkle cornmeal or cornstarch on the rug, let sit for at least 30 minutes, then vacuum Rust removal Lemon iuice plus salt plus sunliqht Rusty bolt remover Carbonated beveraqe Scorch mark remover Grated onion Scouring powder Baking soda or a non-chlorine scouring powder Silver polish Soak silver in warm water with 1 Tbs soda, 1 Tbs salt and a piece of aluminum foil Stainless steel polish Mineral oil Toilet bowl cleaner Paste of borax and lemon juice Tub and tile cleaner % C soda and V2 C white vinegar mixed with warm water Upholstery spot remover Club soda Water mark remover Toothpaste Water softener % C vineqar PESTICIDES1 AND FERTILIZERS Pesticides (such as insecticides and herbicides) and fertilizers are commonly used by homeowners in their quest for bigger, healthier plants and greener, lusher lawns These chemicals are often overused Homeowners often apply too much chemical at the wrong time, such as before heavy rains or any time the plants will not be able to absorb all the chemicals These chemicals are easily I As used here, the word pesticIde can mean any herbIcIde, Insecticide, rodentIcide, miticIde, or other types of chemicals used in the same manner HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 40 introduced into stormwater runoff and can cause algae blooms (fertilizers) or kill off aquatic organisms (pesticides) Fertilizer management Fertilizing a lawn can be done in an environmentally sensitive manner Here are some ideas 1 Before fertilizing, test your soil's pH This can be easily done by using kits that are available, or through tests provided by WSU Cooperative Extension Use only the recommended amount of fertilizer, and add any soil amendments, such as lime, that are recommended in your test results 2 Use fertilizers that are appropriate for your area, and for the type of plants you are growing Work the fertilizer into the soil directly around the plant's drip line By incorporating the fertilizer in the soil, there will be less likelihood of contaminated runoff Contact the Thurston Conservation District to find out this information 3 Water before fertilizing Water enough to dampen the ground thoroughly, but not enough to cause surface runoff Dampening the soil prevents fertilizer from being washed from the surface of dry soil in the first rain or watering after application 4 Many soils can benefit from the use of organic fertilizers such as compost or peat Not only do these substances add nutrients to soil, they also increase the porosity of the soil and increase its ability to hold water 5 Slow release fertilizers (which are generally resin-coated) can be used in addition to organic fertilizers They are not mobile in the soil, and are only applied once Integrated pest management Rather than bringing out the sprayer whenever a pest infestation occurs in the garden, consider using Integrated Pest Management (also known as IPM). IPM emphasizes the evaluation of all factors including environmental effects before chemicals are applied Pesticides should only be used as a last resort Some of the tactics that can be used to decrease or eliminate the use of pesticides include Use of Natural Predators, Pathogens: Because chemical sprays generally kill many beneficial insects instead of just the target pest, it may be necessary to introduce natural predators back into the garden Ladybugs, lacewings, predatory wasps, and nematodes are all commercially available Garter snakes and toads are also predators and should not be eliminated from the garden There are some bacteria, viruses, and insect parasites that are specific to pests and will not harm other insects or animals A commonly used bacterium in the Puget Sound area is Bacillus thuringiensis (Bt), which is HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 41 intended to control infestations of tent caterpillars Products containing Bt are available at your nursery Habitat Changes: Many times a change of habitat can control pest infestations Removal of old tires can cut down on the mosquito population by removing a convenient water-filled location for them to breed in Crop rotation, even in a small garden, can reduce the number of pest infestations Removing last year's leaves from under rose bushes can cut down on the incidence of mildew and blackspot, as these fungi overwinter in dead leaves Timing: Crops that can overwinter (such as leeks or carrots) should be planted in the fall This gives them time to become established before pests arrive in the spring Mechanical: Many eggs, larvae, cocoons, and adult insects can be removed by hand Be sure that the insect is properly identified prior to removing it so those beneficial insects are not destroyed in error Drowning insects in plain water or spraying them with soapy water are alternatives to squashing them Resistant Plants: Plants that are native to this area are often more resistant to pests and climate, etc than are introduced plants Many plant cultivars have been developed which are resistant to such diseases as verticilium wilt and peach leaf curl Grass seed mixes are also available for lawns that need much less watering, mowing, and chemical use Growing Conditions: Plants, such as hostas, that require some shade are more susceptible to pests when they are growing in the sun Plants that are not properly fertilized or watered are less vigorous in growth and tend to attract pests Plants that prefer an acid soil, such as azaleas, will perform better and be less susceptible to pests when they are grown in soil with the proper pH. Chemicals: Chemicals are a small part of the IPM plan and should be applied only as needed after reviewing all other alternatives Pesticide management When use of a chemical is the best or only option, follow these simple guidelines 1 Know what pest you are spraying for Use the pesticide according to the manufacturer's instructions and buy only the quantity needed Many pesticides have a limited shelf life and may be useless or degrade into even more toxic compounds if kept on the shelf 2 Do not apply more than the specified amount Overuse can be dangerous to your health as well as the health of wildlife and the environment If more than one chemical can be used to control the pest, choose the least toxic The word "caution" on the label means that the chemical is less toxic than one that is labeled "warning" 3 Do not spray on windy days, in the morning of what will be a very hot day, or when rain is likely to occur Herbicides can drift and injure valuable HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 42 ornamental plants in either yours or your neighbor's back yard Do not water heavily after application Plants should be lightly watered BEFORE application to prevent burning of the foliage, and to help evenly spread the chemical 4 Never apply pesticides near streams, ponds, or wetlands (exception approved applications for aquatic weeds) Do not apply them to bare eroded ground (exception use of low toxicity herbicides such as Round-up to allow growth of desired planting in small areas) Many pesticides bind to soil particles and can be easily carried into a stream or storm drain 5 Pesticides should be stored well away from living areas Ideally, the storage area should have a cement floor and be insulated from temperature extremes Always keep pesticides in their original containers with labels in tact Labels often corrode and become illegible in this climate and may have to be taped onto the container 6 Federal law now requires that all pesticides be labeled with the appropriate disposal method Leftovers should never be dumped anywhere, including a landfill Take unwanted pesticides to the County's hazardous waste collection days or Hazo House at the landfill 7 Empty containers should be triple-rinsed and the rinse water used as . spray Once containers are triple-rinsed, they are not considered hazardous waste and may be disposed of in most landfills However, call your local landfill before putting the container in the garbage 8 If a pesticide is spilled onto pavement, it can be absorbed using kitty litter or sawdust The contaminated absorbent should be bagged and labeled and taken to Hazo House 9 If the pesticide is spilled onto dirt, dig up the dirt, place it in a plastic bag and take it to Hazo House 10 Many pest control companies and licensed applicators have access to pesticides that are more toxic than those available to the consumer Check with the company before they spray indoors or outdoors to find out what spray they will be using and what precautions, if any, are necessary after the operator leaves HOME REMODELING Remodeling uses some of the most toxic substances found in the home Paints, preservatives, strippers, brush cleaners, and solvents all contain a wide range of chemicals, some of which are suspected to be carcinogens (cancer causing) These products should never be dumped in a landfill or put down a sewer or septic system. 1 When building a deck consider using wood instead of concrete Wood decking allows rainwater to drip onto the ground below, keeping it from becoming surface runoff. HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 43 2 Decks and sidewalks can also be built out of brick interlocking pavers or modular concrete If these surfaces are placed on a bed of well-drained soil gravel or sand, rainwater can infiltrate into the around through them 3 To reduce disposal problems, buy only the amount you need Used turpentine or brush cleaner can be filtered and reused Paint cans should be allowed to dry and then be disposed of during a hazardous waste collection day or at Hazo House 4 Leftover paint can be given away, for example to a theater group Contact the Thurston County Health Department at 754-4111 for other options 5 Roof downspouts can be adjusted to infiltrate runoff where the soil is well drained The runoff from them can enter a gravel bed where it can infiltrate into the ground For design criteria, see your jurisdiction's drainage manual 6 When gardening on slopes, reduce the potential for surface runoff by using terraces across the face of the hill These can be as simple as little soil "bumps" or can be elaborate using such products as pressure-treated wood 4x4's or rock walls SEPTIC SYSTEM CARE AND MANAGEMENT While septic systems do not seem to have a direct relationship with stormwater runoff, they can in some instances be related 1 Roof drains and stormwater runoff should be diverted away from drainfields Excess water reduces the capacity of the drainfield to absorb effluent from the septic tank 2 Water from hot tubs should not be drained into a septic system all at once They are not designed to handle large volumes of chlorinated water Either use the water on plants in the yard, or drain the hot tub slowly over a period of days 3 Septic tanks should be pumped regularly Ponded water, damp places in the yard, foul odors and/or a dark gray or black soil color may indicate septic drain field failure Effluent from a malfunctioning septic can cause disease and nitrate problems in groundwater For septic system assistance, contact the Thurston County Health Department at 786-5490 REFERENCES Puget Sound Water Quality Authority, Managing Nonpoint Pollution - an Action Plan for puget Sound Watersheds, 88-31, June 1989 Washington State Dept of Ecology, Water Quality Guide - Recommended Pollution Control practices for Homeowners and Small Farm Operators 87-30, revised June 1991 Washington State Dept of Ecology, Hazardous Waste Pesticides, 89-41, August 1989 HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 44 GLOSSARY BEST MANAGEMENT PRACTICE (BMP) - Structures, conservation practices, or regulations that improve quality of runoff or reduce the impact of development on the quantity of runoff BIOFIL TER (SWALE) - A wider and flatter vegetated version of a ditch over which runoff flows at uniform depth and velocity Biofilters perform best when vegetation has a thick mat of roots, leaves, and stems at the soil interface (such as grass) BIOFILTRATION - The process through which pollutant concentrations in runoff are reduced by filtering runoff through vegetation BUFFER - The zone that protects aquatic resources by providing protection of slope stability, attenuation of runoff, and reduction of landslide hazards An integral part of a stream or wetland ecosystem, it provides shading, input of organic debris, and coarse sediments to streams It also allows room for variation in stream or wetland boundaries, habitat for wildlife, and protection fror;n harmful intrusion CATCH BASIN - An inlet for stormwater set into the ground, usually rectangular and made of concrete, and capped with a grate that allows stormwater to enter CHECK DAM - A dam (e g , rock, earthen, log) used in channels to reduce water velocities, promote sediment deposition, and/or enhance infiltration COMPOST STORMWATER FILTER - A treatment facility that removes sediment and pollutants from stormwater by percolating water through a layer of specially prepared big leaf maple compost Clean water exits the bottom of the facility through a pipe, while stormwater flows in excess of the facility design overflow the compost bed and bypass the facility CONSTRUCTED WETLAND - A wet pond with dead storage at varied depths and planted with wetland plants to enhance its treatment capabilities CONTROL STRUCTURE OR FLOW RESTRICTOR - A manhole and/or pipe structure with a flow-regulating or metering device such as a weir or plates with small holes known as orifices This structure controls the rate at which water leaves the pond CONVEYANCE - A mechanism or device for transporting water including pipes, channels (natural and man-made), culverts, gutters, manholes, etc HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 45 CRITICAL AREA - Areas such as wetlands, streams, steep slopes, etc as defined by ordinance or resolution by the jurisdiction Also known as environmentally sensitive areas CULVERT - A conveyance device (e g , concrete box, pipe) which conveys water from a ditch, swale, or stream under (usually across) a roadway or embankment DEAD STORAGE - The volume of storage in a pond below the outlet which does not drain after a storm event This storage area provides treatment of the stormwater by allowing sediments to settle out DETENTION FACILITY - A facility (e g , pond, vault, pipe) in which surface and storm water is temporarily stored DETENTION POND - A detention facility in the form of an open pond DISPERSION TRENCH - An open-top trench filled with riprap or gravel that takes the discharge from a pond, spreads it out, and spills (bubbles) the flow out along its entire length Dispersion trenches are used to simulate "sheet flow" of stormwater from an area, and are often used to protect sensitive adjacent areas, such as wetlands DRAINAGE SYSTEM - The combination of Best Management Practices (BMPs), conveyances, treatment, retention, detention, and outfall features or structures on a project DROP STRUCTURE - A structure for dropping water to a lower elevation and/or dissipating energy A drop may be vertical or inclined DRY POND - A detention facility that drains completely after a storm This type of pond has a pipe outlet at the bottom EASEMENT - A right afforded a person to make limited use of another's real property Typical easements are for pipes or access to ponds, and may be 15 to 20 feet wide EMERGENCY OVERFLOW OR SPILLWAY - An area on the top edge of the pond that is slightly lower in elevation than areas around it This area is normally lined with riprap The emergency overflow is used only if the primary and secondary outlets of the pond fail, in the event of extreme storms, or if the infiltration capability of the pond becomes significantly diminished If the emergency overflow ever comes into play, it may indicate the pond needs to be upgraded ENERGY DISSIPATER - A rock pad at an outlet designed to slow the velocity, spread out the water leaving the pipe or channel, and reduce the potential for erosion HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 46 FREEBOARD - The vertical distance between the design high water mark and the elevation of the top of the pond Most ponds have one to two feet of freeboard to prevent them from overflowing INFILTRATION - The soaking of water through the soil surface into the ground (percolation is essentially the same thing) Many ponds are designed to infiltrate or retain stormwater, and thus do not have a regularly used discharge pipe INFILTRATION FACILITY (OR STRUCTURE) - A facility (pond or trench) which retains and percolates stormwater into the ground, having no discharge (to any surface water) under normal operating conditions JUNCTION - Point where two or more drainage pipes or channels converge (e g , a manhole) JURISDICTION - Olympia, Lacey, Tumwater, Yelm, or Thurston County (as applicable) LINED POND OR CONVEYANCE - A facility, the bottom and sides of which have been made impervious (using, for example, a plastic liner or clay/silt soil layer) to the transmission of liquids LIVE STORAGE - The volume of storage in a pond above the outlet which drains after a storm event This storage area provides flood control and habitat protection for nearby streams MANHOLE - A larger version of a catch basin, often round, with a solid lid Manholes allow access to underground stormwater pipes for maintenance NATURAL CHANNEL - Stream, creek, river, lake, wetland, estuary, gully, swale, ravine, or any open conduit where water will concentrate and flow intermittently or continuously OIL-WATER SEPARATOR - A structure or device used to remove oil and greasy solids from water They operate by using gravity separation of liquids that have different densities Many catch basins have a downturned elbow that provides some oil-water separation OUTFALL - The point where water flows from a man-made conduit, channel, or drain into a water body or other natural drainage feature RETENTION FACILITY - An infiltration facility RETENTION POND - A retention facility that is an open pond HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 47 REVETMENTS - Materials such as rock or keystones used to sustain an embankment, such as in a retaining wall RIP RAP - Broken rock, cobbles, or boulders placed on earth surfaces, such as on top of a berm for the emergency overflow, along steep slopes, or at the outlet of a pipe, for protection against the action of water Also used for entrances to construction sites RUNOFF - Stormwater SAND FILTER - A treatment facility that removes sediment and pollutants from stormwater by percolating water through a layer of sand Clean water exits the bottom of the facility through a pipe, while stormwater flows in excess of the facility design overflow the sand bed and bypass the facility STORMWATER - That portion of precipitation that falls on property and that does not naturally percolate into the ground or evaporate, but flows via overland flow, channels or pipes into a defined surface water channel, or a constructed infiltration facility Stormwater includes washdown water and other wastewater that enters the drainage system ., SWALE - A shallow drainage conveyance with relatively gentle side slopes, generally with flow depths less than one foot This term is used interchangeably with "BIOFILTER" TRASH RACK OR BAR SCREEN - A device (usually a screen or bars) that fits over a pipe opening to prevent large debris such as rocks or branches from entering and partially blocking the pipe WET POND - A stormwater treatment pond designed with a dead storage area to maintain a continuous or seasonal static water level below the pond outlet elevation HATTON GODAT, PANTIER & ASSOCIATES DRAINAGE REPORT - Longmire Meadows Page 48 ".ppeod\)( ". - 50\15 ".oalVstS LISA PALAZZI 203 FOURTH AVENUE EAST, SUITE 521 OLYMPIA, WASHINGTON 98501 VOICE (360) 534-0346 FAX. (360) 534-9027 Bob Bussey 157 Lermeux Lane Teruno, WA 98589 (360)264-6355 September 21, 2000 Report File Number Report Subject Location. GOO-0075 Soils mvestIgatIon for stormwater system desIgn. The TeItge study sIte IS a CIty block located between Longmrre, Solberg, Coats and Van Trump streets m the CIty ofYelm, It IS m the NW 1/4 of Section 19, Townslup 17N, Range 2E ., An onsIte soils mvestIgatIon was performed on September 6, 2000 by Lisa PalazzI. The mtent of the work was to IdentIfy and characterIZe on-sIte soil condItions and how they would affect storm water facility desIgn. The purpose oftlus document IS to report the results of those mvestIgatIons. MAPPED SOIL SERIES DESCRIPTIONS: Accordmg to the Thurston County Soil Survey, the followmg soil senes are mapped on the sIte' Spanaway gravelly sandy loam, 0-3% slopes and Spanaway stony sandy loam, 3-15% slopes (both classIfied as a sandy-skeletal, mIXed, meSIC AndIC Xerumbreptl) For your mformatIon, standard charactenstIcs ofthe mapped soil senes are described m AppendlX II Please note that the SCS soil senes maps and descnptIons characterIZe expected charactenstIcs m only the top 60 mches of soil. Furthermore, the map uruts can have extensIve mclusIons of other soil types, and m some rare cases, can be entrrely m error Please refer to the mdIvIdual pIt descnptIOns m Appendix I and to the dIScussIon m the text below for specIfics on observed SIte soil condItions. I Sandy-skeletal, mixed, mesic Andic Xerumbrept, generally meaning the soil has minimal horizon development (ept), has a dark-colored, low base saturation surface horizon (umbr), has developed under conditions of winter precipitatIon and surruner drought (xer), has characteristics attributed to volcanic deposits (andic), has a mesic temperature regime (mean annual temperature ranges from go to 15" C (470 - 590 F), has no specific mineralogic source (mixed), has 15-50% sand by weight and greater than 35% coarse fragments by volume (sandy-skeletal). Page 1 SITE GEOMORPHOLOGY AND SOILS DESCRIPTION The study site (approxnnately 4.3 acres) IS bordered by Coates Street on the north, Van Trump Street on the South, Longmrre Street on the West, and Solberg Street on the East. Accordmg to the topographIc map provIded by Thurston County, sIte relIef IS approxnnately 8 feet. There are two low areas onsIte The first IS a depressIOn located about m the rmddle of the southern half wIth a low of340 feet. The second low area IS a swale-like feature lymg dIagonally from southeast to north west across the northern half of the sIte WIth a low of342 feet. There IS a hIgh of 348 feet m the northeast comer; 346 feet rmdsIte between the two lows, and 344 along the southern slte boundary The nearest natural body of water, accordmg to the USGS McKenna quad IS Yelm Creek, located about 1000 feet to the north east ofthe sIte. It has a surface elevatIon of approxImately 324 feet. Solberg Lake and nearby wetlands are located about 4000 feet south of the SIte WIth surface elevatIons ofapproxnnately 340-344 feet. The Nisqually RIver IS located about 1 6 miles from the northern border of the SIte WIth a surface elevatIon of apprmomately 230 feet. Yelm Creek IS the closest water body, and most likely to be hydrologIcally related to thIs SIte The creek drams to the northwest, so IS hydrolog1cally downslope from thIs SIte So we rmght expect water tables m thIs are to be slIghtly hIgher Even so, the water surface elevatIon at Yelm ., Creek IS 16 feet lower than the lowest elevatIon at the study slte Three soil pItS (SP-I through SP-3) were excavated and described onsIte The soil pIts are located on the SIte map m AppendIX IV All three soil pIts had charactenstIcs WIthIn the range allowed for the Spanaway senes. Surface soils were only moderately permeable to 24 mches, havmg a dense, gravelly fine sandy loam texture. But below that, the subsoils had extremely gravelly sand textures with very rapId permeability A water table and evidence oflong-duration saturatIon was encountered at 10 feet m PIt 2 (water table at approxnnately 331 feet elevatIon), but not m the other two PItS. We assume that PIt 2 was lowest m elevatIon of the three. Although the dIfference between PIt 1 and 2 was slIght. It is possible the observed water table was locally perched, but the fact that there was water at this tIme of year still suggests a perSIstent condItIon. We take thIs to be groundwater, probably m connectIon WIth waters feedmg Yelm Creek. PercolatIon rates m the gravelly subsoils above the water table and below the moderately permeable surface soils are expected to be qUIte rapId -- well m excess of20 mches per hour PreVIOUS testmg m these soils types on nearby SItes have mdIcated effectIve mfiltratIon rates of between 50 and 150 mches per hour However, we seldom recommend desIgmng to those rates. If the mfiltratIon pond base IS left m gravel (no topsoil or grasses), deSIgn rates of20 mches per hour can be attamed as long as sedIment loads are nnrurmzed through effectIve, long-term eroSIOn and sedIment control. However, lithe base IS grassed, a topsoil must be Imported, and rates of no greater than 4 mches per hour are recommended. Even so, the Imported topsoil must not be compacted m order to attam that mfiltratIon rate Page 2 These soils have only a very hrmted water filtermg capacIty because they dram too rapIdly For that reason, It 1S vItal that stormwater treatment (prIor to mfiltratIon) features be desIgned and mamtamed properly to protect local groundwater qualIty I hope tills report proVIdes enough mformatIon to proceed WIth project planrung. Please call If you have any questIons or reqUITe addItIOnal detail or clarIficatIon on any of these Issues. Thank You, ~~~e:'[nc LIsa PalazzI ARCP ACS certIfied soil specIalIst CertIficatIon #3313 ,~ Page 3 APPENDIX I Pit 1 Horiz !2illh Col CF Txt Strilc Perc ~ Mott Roots OM %C A 0-24 IOYR 2/2 50 SL MMO 2-64 0 MF 8 12 Bw 24-38 " 5/4 60 LMS SO 20+ 0 FFIFM 3 <10 C 38-132 " 5/4 70Co LMS SO 20+ 0 0 <3 <10 Spanaway series. Percent cobbles increase with depth. No sign of a water table within 11 feet of the surface. Pit 2 No detailed pit description. Very similar to Pit I, but encountered evidence of water table at 10 feet Pit 3 No detailed pit description. Very similar to Pit 1 Page 4 APPENDIX II SP ANA WAY SERIES Gravelly sandy loam The Spanaway gravelly sandy loams are very deep, somewhat excessIvely dramed soil on terraces formed m glacial outwash and volcaruc ash. The top 20 mches are expected to be very dark- colored gravelly to very gravelly loams and sandy loams. Subsoils are expected to be extremely gravelly sands. In some areas, these soils can also be very stony (rocks larger than 10 mches m diameter) Soil percolation rates are expected to be moderately rapId (2-6 illches per hour) near the surface and very rapId ( greater than 20 mches per hour) m the extremely gravelly sand substratum. These soils are used mamly as hayland, pasture, or cropland, as homesltes, or as a gravel source. The prnnary hrrutation for any vegetation-related use IS the very low water holdmg capac1ty m the subsoils. The volcaruc ash mfluence in these soils may be eVIdenced by fine-textured soils m mterstIces between coarse fragments. Furthermore, these soils may show an mcreased tendency to cement or compact firmly ill surface horIZOns when dIsturbed. The volcaruc ash partIcles tend to break: down mto amorphous clays -- a silica gel. The mam hrmtatIon for septic system (or stormwater pond) desIgn IS the gravelly subsoil's poor :filtermg capaCIty -- a result of rapId percolation rates and relatively low silt and clay content. Commuruty sewer systems or alternative septIC systems (usually sand :filter and/or pressure dIstribution) are encouraged to aVOId contammation of groundwater or nearby wells. Grass-lined swales or sand lIned ponds may be encouraged for pretreatment of stormwater pnor to mfiltration. Stony sandy loam The Spanaway stony sandy loams are very deep, somewhat excessIvely dramed soil on terraces formed m glaCial outwash and volcaruc ash. The top 16 illches are expected to be black stony sandy loams underlam by 6 mches of very dark brown gravelly sandy loam. Subsoils to 60 mches or greater are expected to be graYIsh brown extremely gravelly sands. Soil percolation rates are expected to be moderately rapId (2-6 mches per hour) near the surface and very rapId (greater than 20 mches per hour) ill the extremely gravelly sand substratum These soils are used mamly as hayland, pasture, or cropland, but are greatly hrmted by the stony surfaces. They are well-SUited to homesItes, but landscaped areas will reqUITe surface stone removal. The prnnary linntation for any vegetation-related use IS the very low water holding capaCIty m the subsoils. Page 5 The volcaruc ash rnfluence m these soils may be eVIdenced by fine-textured soils m mterstIces between coarse fragments. Furthermore, these soils may show an mcreased tendency to cement or compact firmly m surface honzons when dIsturbed. The volcamc ash partIcles tend to break down mto amorphous clays -- a silica gel. The rnam lnmtatIon for septIc system or stormwater pond desIgn IS the gravelly subsoil's poor filtermg capacIty -- a result of rapId percolatIon rates and relatIvely low silt and clay content. Cornmumty sewer systems or alternatIve septIc systems (usually sand filter and/or pressure dIstributIon) are encouraged to aVOId contahnnatIon of groundwater or nearby wells. Grass-lmed swales or sand lmed ponds may be encouraged for pretreatment of stormwater pnor to mfiltratIon. ,,4, Page 6 , ",J\ ' ','." i<:l ---:::-- ..,.- 1 \ L._~) CJ,:r:::::--_ L__, ,-~.......-, ';} -- \ \:"- '::"1 iI' a _', ,___ _ '\ l' ~--:: -----" . . ~--- ita. \. ,~ ~I 0 -' , \, //:" ~--c, '\ ',. - Ie, 4'f;f \~ '\ \ , ~'{" ' ,,;r" '. , ",. F \ , ',! "I' , '. ~ >! \. '",I \\~' S'te /l' \1 " \~' , '~~, 'i.pr9j~ \ l' . ' l?'~~~ "~~:':-~y,,\\ ~J~~"\ ' :ft' L-c ___ " ~'Z~, /. j'~ ~ ;;~/~-" JA '.., " . "', (""" -~.....~. 1,,' '- ~.... ....""". ' I "~.,~ ",' A""" \ _ " "'. , , '4/.Jl) \ , };\~("-:';,f 1/ "'~//;' '.i1Y '. ;~ I;' ',' '>. ...... I." "/ , I . " , / ',.17" / · ", f :',/":--."." ' 1"",,< y~ ", ,/, ,/ _>, ' ----. ':::'~'" .; "'ii);. /; '., . ' W /,i, \ ~ ' ~-""", t'~' ,', II .:.,...(/0//, ',.-;/ I"~<!.__\ \ ~ .~./ ',. '-." / " . , " . ':r..........~~.. ,., ''''I<" c'" , 1'<;,)"./( A'<'<.. '/-..~, /, _.;, "<:::, \" 'I',," ' 1/. "'7 ,1-,. ""'/e' "<it . ' " l~~' ;' /'1~ ~ I /. ~.. t' . '( t"- l' <<,~_ /" ~cZ ) c ~,/. ". " " . 4{ "(ijQ1"\.r I Ii . ~.. J", ;;- _~'" ..~;..,~ / /.-.q~~h.i ". Ii"~....~ """"ij~ '. \... -c:< 1~~ ' I ..." " , ,'< , .. . .' " "" .,'. -:..::'IQ..~", '~"jf' ''';' '" ;' . 1...;,/:,., ' , 'r,"" '. I. "0 :: ,00:/ "-. ;'~'" (,' "-.AI' ' "~ ""i" ,J, ~,,' if ,-~ =-""''' '." " r',~,' P , "';" --~ /' /'.."". f,," J 11 ~y "" / 'L..~~~~> \ \ "" "r J~ 'r" '~ /fJ/'.j1 "," ~.~ \,. ('~ " /.,( ;" 'tp~,. .~~ \ ":. \ I '\ " ~'" ~$.:\t ....~-~-'!-"'----"" '\ \, " ., .....,.... .;. ./' ."f ,~-;>," Map VicuuW ct Slte 1m proJe . tge-Ye Tle 000-0075 Number Reference .~~, -l .....~\'"":;'\.~~. ~ii:-"'~..,~:;; ,.. ',-'.,.'<-'-Prn-i'pct-Sire-''---'. \ ':-' -c.-.t.::-.:.-.:-~ ,-,~ '.X .~~,,~ :;:--:"112_>\ ,(;iJ \ , ,.f' ,liff' ,. '! '''-},'\'.'' <:./" ~'~'~:::li -";':~ ..-?' \ \ ~kd" .J(I'f: j ,\ r.-~. ,,;,J.P' ", /-~,:~ 19 "tt~~~i ::~~ \ ; --'/ ~ ,\ 1>:;.. ~, ',l"?";' ;.J' f ''\ .~~11'., ,111 ~"'..., \. ",;~~; ,:J ",';:;~~ ~;" 't, -: 'I" ~~",I!:( .. ~~~~:::~~-~ };';'>/.:.;, \ i:1 ') \ '.\ ,-~i "5',\ \~\ t~ 'f~ ~~,.~~~' '~jA~~ .~. \~,,--' ~i ~:~ .,,~ ~~~~' \ ::1" '\,: '.r.., . .,>T.! \;:. \\ ~l1l' ~'" t \~~ ~~~nt '2"~~ ':, ~ ~ '. , f.' I ' 1 ~,if: "'" ,'--., J1 11:1 \>.2' 'ft -' 35 ",t.:'t ~-~-~~"W;;;, - .2G' ,.,~,.,,;., r~' '~~:,\~j\-'\, '. , '1-f;3F<)(~ ., " ~/ry,.IlM> .,;lft;J .:> _~'~~e,";,~ft~:?_~~2. .---- 11 \1 ~ l)f '*i~4}~' .~ j ~;di ",~""\c,<;_ Thurston County Soil Survey Tietge- Y elm Project SIte Map Umt 110 113 Soil Senes Spanaway gravelly sandy loam, 0-3% slopes Spanaway stony sandy loam, 3-15% slopes Reference Number GOO-0075 Map Produced By: Thurston GEODA T A Center's Internet Map Server Scale Approx. 1 Inch = 161 Feet 9/22/00400 10 PM TeItge Stormwater Project Geodata system topography Soil PIt LocatIOn l.!. File Reference #. GOO-0075 " '.1 . \ I, I q . .. ,~ 343 i.:--.., . . -- ~..... ) --~;"-,..-......,.,.--.,,:>.... I _! . :-.~~, .~ i (. r .. :.. _ ~,---..-,. ~33-7---' -..:;...,..;;;;.....~"'."--:f-- . . ~.._-.~~ J . .- -' -' 11 - -' ~II I ~, t/ \ :::) . " , il \ ' ......9'0 ..}. V QI~' , 'IJ~l\' \ . · I.L~. ~ \1\ ", . II . : ; I . . ~I II .i ..I!!.. ...---, tl '" ,I. '. jl ~l\_~_. r'~---f' . 'Parl< . I '\ \ t \ . ~ I) ,~ ~ "'l;d . ! . .J-\ ~~ , A~ l.~ , \ .. _._J . · Mobile - . . HOI11e Pork "" ..~~... .~- -..-, --,~~~..::~-_.....,~,..~..~,-=-~~ '-, '\ . ~"--'r~ ~.q B.'A~CH ~~: '" .. .. ,.' ., : l ..... I < -.,. · I .1 "::;' ~ . \. " ":i1: ", .~~ ,t<;:\ '~:'" · '. '>'.'> , 330 I .", .\~\..{ " ....~,..\.: --- . ........ _oJ -- '.1.." . ~ -t ::.::1>, ......;1;" ~l . l ~ ...""""''* · · t ~...---.., '1..- I+- ~51?) \ -, (..) . ~ I, '0 ,\ I \ \~ .\\ ''i '~ \ -.. l "- ..... " '\ .....1 \ . . \ \ . , ~ ,/# ~ -, / I . I · 'r .< l I 24 .. , iA. J ~'~I · '.. . .\ " " I I ~ .. 1 --......."" l'~' )( s;r2 .. . ---'.. ..~~ ' .."'......,"..........- · !. ,. . -.".' """"..,.--.- .. i. '\ I · ,\ . . -.:.::.. - . · tunc N AD27 00 Detoili U.O D. 350 ft Sc.Ie: 1 12,8 r---\ I I I I I --------+---- I I I I I I E-i ~ ~ Uj ~ ~ ~ ~ o ~ .1\.--1 COATES _::____~___,== __ _ ~ STREET M__ r _ ==--=-~~::: o"'='~~~ ~- " -~--~~ - /' r':"~",,:= ~- III 1-1- · I I IJ Ii Pv' ( ! _ il i I' : II :\~A--2 I \~~ , \ I i I I I , , ,;I E-i ' i fl 1 'l"ilo4 !~ i~ iUj I , \~ \~ \~ l~ i~ 10 ilJJ I i I t , , I I I i I I .AI It I' ,j Ii / : ! i I ~ I' ' " ! /_.,) \'{>.ll II :1 I III tI I II ~~""7-. ~~-- ;/.:::.:=::;.~---:- ~~=--~ ;f~..._ -... I 1 I I I I I I I I I I I I I j I I I \ j I I I I I I I j I I I I I I I I I I I I I I I I / 1'"----------.1. I ,/ I __________JL_____{ ; I ----' I I I I I I I I I I I 'ill I ~I I ! I I -""" \ } ~' .._--------------J I ",-/ If) /--~ /' / , -d"" " ""------ ~r "n I !( \:, I iii I' 1'< lr n l. il ;1 i " I i 11/ Iv I I [\ 22 -'(' ~ ~ /J '" 19 .....~ --/ / ".- lDJ : 16 r---- I I ,,' QSDIOIT I~~ i -l-- I I I I f" // roO> / ./ ,/ 'i3./ /' ( ,/ I ;~--{""" \ I I I I I _/~ -//j 7 : , 1'8--- .=: , "I // ./ , , '. -==- ,,:;,.---- ~ -J",,___ \ \ '1/- i ! I I I ST I I I I I VAN TRUMP LONGMIRE ME.1\.PO-WS TRIBt.1T .1\.RY .1\.RE.1\.S .1\.--4 ;:.. 01'il'G~~~ ~S~~~~S ..... ,.R\SU" p.RY P.REAS AA A-5 A-6 A-2 A-3 ~ A-'\ ~ 0.'\8 AC 2.80 p.C 0.30 AC 0.08 AC 0.30 At 0.,\4 AC ,.0" A\. AREA 0.00 AC 0.00 p.C '\ .05 AC 0.00 AC 0.00 At 0.00 p.C ROOf"OP p.REA 0.00 AC 0.00 AC 0.42 AC 0.00 AC 0.00 At 0.00 AC ORNE\HAY AREP. 0.30 AC 0.'\8 AC 0.00 AC 0.08 p.C 0.30 At 0.,\4 AC S,.REE" AREA 0.30 p.C 0.'\8 AC ,\.47 AC 0.08 AC 0.30 At 0.'\4 p.C ,.0" A\. \N\PER"\OUS p.REP. '\00.000/0 '\ 00.00 0/0 52.50 % '\00.00 % '\ 00.00 % PE"CEtl"f Of 'N\PE""'OUS 1''''''' '\ 00.00 % 0.00 AC 0.00 AC '\ .33 AC 0.00 AC 0.00 At 0.00 AC ,.O,.A\' PER"\OUS AREA 0.00% 0.00 % 47.50 % 0.00 % 0.00 % PERCEN" PER"\OUS P.REA 0.00 % ,.0" p.\. ,.R\SU" p.RY AREP. ,.0" p.\. ROOf"OP AREP. ,.O"p.\. OR,"E\HP.Y AREP. ,.0" p.\. S,.REE" AREA 3.80 AC '\.05 AC 0.42 p.C '\ '\8 p.C 2.65 AC 69.74 % ,.0" A\. \N\PER"\OUS AREA '\ '\ 5 AC 30.26 % __A' PER"\OUS AREA Appendix C - HYDRA Analysis, 2-Year, 24 Hour Storm & 100-Year, 24 Hour Storm Howard Godat & Associates, Inc Olympia, WA HYDRA Version 4 65 Page 1 C \HYDRA\CMD\00-219 CMD ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ 8 30 8-Nov-100 2-Year, 24-Hour Storm Event Status of DEFAULTS at start of run Command file C \HYDRA\CMD\00-219 CMD Input units are read as Warnings are turned Output sent to display Output sent to printer Output sent to file Paper width in inches String to reset printer String to set printer to compressed String to set printer to 8 lines/inch Name of printer Print heading at top of page Number of steps in hydrograph Step length in minutes Significant flow in hydrograph Infi~tration Diurnalization Factor Maximum plot value Type of hydrographic plot Sanitary flow by Delay to start of actual storm Rational Method computations SCS computations Continuous simulation computations Maximum diD for pipe design/analysis Match point position on pipe Number of allowable diam drops Mimimum drop thru manhole Manning's n Routing technique Calculate sanitary flows Calculate infiltration flows Calculate misc flows USA OFF Brief Off Brief 8 000 NOT SET NOT SET not set NOT SET ON 96 15 o 010 o 980 Selected by HYDRA Compact Peaking Factor o 00 OFF Santa Barbara OFF o 900 o 00 or Invert o o 000 Variable Quick ON ON ON +-------------------------------------------------------------------- 1 JOB LONGMIRE MEADOWS 2 3 TOT 1 79 4 FIL 6moZONE1 INC ------START OF SUB-FILE------ Howard Godat & Associates, Inc Olympia, WA HYDRA Version 4 65 Page 2 ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ C \HYDRA\CMD\00-219 CMD S 30 S-Nov-100 LONGMIRE MEADOWS 1 HYE 15 0 01 0 01 0 01 0 01 0 01 0 01 0 01 0 01 0 02 0 02+ 2 0 02 0 03 0 04 0 04 0 04 0 05 0 05 o 05 0 06 0 06+ 3 0 06 0 06 0 06 0 OS 0 OS 0 OS 0 15 o OS 0 20 o 29+ 4 0 76 0 06 0 lS 0 lS 0 13 0 13 0 19 0 15 0 11 o 09+ 5 0 15 0 11 0 12 0 09 0 09 0 09 0 09 0 OS 0 OS o OS+ 6 0 OS 0 10 0 10 0 10 0 10 0 10 0 09 0 OS 0 OS o OS+ 7 0 06 0 06 0 06 0 06 0 06 0 06 0 06 0 05 0 05 0 04+ S 0 04 0 04 0 04 0 04 0 04 0 04 0 04 0 04 0 04 0 04+ 9 0 04 0 04 0 04 0 04 0 04 0 04 0 04 o 04 0 04 0 04+ 10 0 04 0 04 0 04 0 04 0 04 0 04 11 RET ------ END OF SUB-FILE ------ 5 FIL DESIGN INC ------START OF SUB-FILE------ 1 CHD 100 01 15 3 2 3 01 0 o 0 0 2 DPD 010 S 01 01 01 001 90 36 3 EPD 013 2 90 4 REM n= 010 FOR PVC & HDPE PIPE 5 RET ------ END OF SUB-FILE ------ 6 7 NEW LONGMIRE MEADOWS S SCS 0 OS 1 00 9S SO 5 AREA A-1 9 SCS o 30 1 00 9S SO 5 AREA A-2 10 SCS 0 14 1 00 9S SO 5 AREA A-3 11 SCS o 30 1 00 9S SO 5 AREA A-4 12 SCS 0 lS 1 00 9S SO 5 AREA A-5 13 SCS 2 SO 0 525 9S SO 10 AREA A-6 14 15 RED (0/0 100/0 1000/0 100000000/0) 16 RES 335 335 335 OVER 17 END Howard Godat & Associates, Inc Olympia, WA HYDRA Version 4 65 Page 3 ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ C \HYDRA\CMD\00-219 CMD 8 30 8-Nov-100 LONGMIRE MEADOWS ------ SUM MAR Y o F A N A L Y S I S ------ Run number on command file Number of links Number of hydrographs Total sanitary population Total sanitary area Total storm area Number of pumps Number of reservoirs Number of diversion structures Number of inlets Length of new pipe Length of existing pipe Length of channel Length of gutter Length of transport units Length of pressure pipe 1 2 38 o o 00 Acres 3 80 Acres o 1 o o o 00 Feet o 00 Feet o 00 Feet o 00 Feet o 00 Feet o 00 Feet ,,4, Howard Godat & Associates, Inc Olympia, WA HYDRA Version 4 65 Page 1 ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- C \HYDRA\CMD\00-219 CMD 8 30 8-Nov-100 CFS LONGMIRE MEADOWS Lateral length= o Upstream length= o *** LONGMIRE MEADOWS Reservoir Invert -------------- Maximum Flow Values ----------------- Link Up/Dn/Ovr San Inf Sto Mis Design 2 335 00 Incoming 0 00 0 00 1 17 0 00 1 17 335 00 Discharge 0 00 0 00 0 00 0 00 0 00 335 00 Overflow 0 00 0 00 0 00 0 00 0 00 Stored 0 0 16099 0 16099 Cost Exfil o o Lateral length= o Upstream length= o Howard Godat & Associates, Inc Olympia, WA HYDRA Version 4 65 Page 1 ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ C \HYDRA\CMD\00-219 CMD 9 00 8-Nov-100 lOO-Year, 24-Hour Storm Event at start of run Command file C \HYDRA\CMD\00-219 CMD Input units are read as Warnings are turned Output sent to display Output sent to printer Output sent to file Paper width in inches String to reset printer String to set printer to compressed String to set printer to 8 lines/inch Name of printer Print heading at top of page Number of steps in hydrograph Step length in minutes Significant flow in hydrograph Infiltration Diurnalization Factor Maximum plot value Type of hydrographic plot Sanitary flow by Delay to start of actual storm Rational Method computations SCS computations Continuous simulation computations Maximum diD for pipe design/analysis Match point position on pipe Number of allowable diam drops Mimimum drop thru manhole Manning's n Routing technique Calculate sanitary flows Calculate infiltration flows Calculate misc flows USA OFF Brief Off Brief 8 000 NOT SET NOT SET not set NOT SET ON 96 15 o 010 o 980 Selected by HYDRA Compact Peaking Factor o 00 OFF Santa Barbara OFF o 900 o 00 or Invert o o 000 Variable Quick ON ON ON +-------------------------------------------------------------------- Status of DEFAULTS I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 JOB LONGMIRE MEADOWS 2 3 TOT 6 15 4 FIL 100Z0NE1 INC ------START OF SUB-FILE------ Howard Godat & Associates, Inc HYDRA Version 4 65 Olympia, WA Page 2 ============================================================================== C \HYDRA\CMD\00-219 CMD 9 00 8-Nov-100 LONGMIRE MEADOWS 1 HYE 15 0 091 0 091 0 091 0 091 0 091 0 091 0 106 0 123 0 12 3 0 123+ 2 0 159 0 159 0 159 0 159 0 176 0 202 0 212 0 212 0 236 0 236+ 3 0 248 0 279 0 308 0 308 0 323 0 323 0 412 0 412 0 373 0 373+ 4 0 971 2 514 0 553 0 367 0 508 0 391 0 389 0 539 0 579 0 333+ 5 0 449 0 466 0 292 0 292 0 272 0 272 0 272 0 272 0 272 0 272+ 6 0 234 0 234 0 215 0 237 0 241 0 259 0 259 0 259 0 237 0 237+ 7 0 227 0 227 0 208 0 189 0 189 0 189 0 164 0 164 0 151 0 151+ 8 0 151 0 151 0 151 0 151 0 151 0 151 0 151 0 151 0 151 0 151+ 9 0 151 0 151 0 151 0 151 0 151 0 151 0 151 0 151 0 151 0 136+ 10 0 136 0 136 0 121 0 121 0 121 0 121 11 RET ------ END OF SUB-FILE ------ 5 FIL DESIGN INC -- -- -- START OF SUB-FILE------ 1 CHD 100 01 15 3 2 3 01 0 0 0 0 2 DPD 010 8 01 01 01 001 90 36 3 EPD 013 2 90 4 REM n= 010 FOR PVC & HDPE PIPE 5 RET ------ END OF SUB-FILE ------ 6 7 NEW LONGMIRE MEADOWS 8 SCS 0 08 1 00 98 80 5 AREA A-1 9 SCS 0 30 1 00 98 80 5 AREA A-2 10 SCS 0 14 1 00 98 80 5 AREA A-3 11 SCS 0 30 1 00 98 80 5 AREA A-4 12 SCS 0 18 1 00 98 80 5 AREA A-5 13 SCS 2 80 0 525 98 80 10 AREA A-6 14 15 RED (0/0 3210/2 11 6742/2 11 10598/2 11 14780/2 11) 16 RES 335 335 335 OVER 17 END Howard Godat & Associates, Inc Olympia, WA HYDRA Version 4 65 Page 3 C \HYDRA\CMD\00-219 CMD ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ 9 00 8-Nov-100 ------ SUM MAR Y o F LONGMIRE MEADOWS A N A L Y S I S ------ Run number on command file 1 Number of links 2 Number of hydrographs 39 Total sanitary population 0 Total sanitary area 0 00 Acres Total storm area 3 80 Acres Number of pumps 0 Number of reservoirs 1 Number of diversion structures 0 Number of inlets 0 Length of new pipe 0 00 Feet Length of existing pipe 0 00 Feet Length of channel 0 00 Feet Length of gutter 0 00 Feet Length of transport units 0 00 Feet Length of pressure pipe 0 00 Feet ., Howard Godat & Associates, Inc Olympia, WA HYDRA Version 4 65 Page 1 ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- C \HYDRA\CMD\00-219 CMD 9 00 8-Nov-l00 CFS LONGMIRE MEADOWS Lateral length= o Upstream length= o *** LONGMIRE MEADOWS Reservoir Invert -------------- Maximum Flow Values ----------------- Link Up/Dn/Ovr San Inf Sto Mis Design 2 335 00 Incoming 0 00 0 00 5 55 0 00 5 55 335 00 Discharge 0 00 0 00 2 11 0 00 2 11 335 00 Overflow 0 00 0 00 0 00 0 00 0 00 Stored 0 0 8017 0 8017 Cost Exfil o o Lateral length= o Upstream length= o