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HomeMy WebLinkAboutBLD2006-00679 Stormwater Management Plan • Memo '0 � : �- 1 N G I N E E R I N G 2020 ENGINEERING, Inc. �_-- 700 Dupont Street-Post Office Box 1621 Bellingham, WA 98227 USA ..�..� (360)671-2020 Fax: (360)671-0322 APPROVEDww .2020engineerinq.com To: Public Works DepartmEnt STORMWA I'ER PLAN D. e: September 14, 2006 Jefferson County CQ James Westall JAN 0 0 ra • s- BU wasy If From: Mark Buehrer, PE ` ' /Ark I Jenifer Ramsey, EIT JEFFERSO 2020 ENGINEERING DEPT.OF Mt T v ME I wSIGtiATURE 25353 Re: Westall Property —Grading Permit 4'sTER9 c • Stormwater Management Technical Memorandum SIONAL EXPIRES FEBRUARY 16, 2007 The purpose of this memo is to provide a summary of the stormwater management provided for the Westall property site for building a house and its associated parking. The proposed scope of work is to build a house consisting of five separate buildings, and two small parking areas to serve 8 cars. The total area for the buildings and parking areas is approximately 15,000 square feet. Based on this scope of work, the project is determined to be "large" in size, and is required to conform with Minimum Requirements #1 through #10. The following is a summary of the project, scope of work, and how the minimum requirements will be met. Project Summary The site is located near Port Discovery off of Highway 20, as shown on Figure 1. The total area for the property is approximately 6 acres, with slopes onsite varying from approximately 10 to 70% (35 degrees). The total area proposed for new grading work is approximately 1.4 ac., as shown on the site plan in Figure 2. In general, the overall slope of the property is approximately 23% (13 degrees). The total elevation change is approximately 200 feet from Highway 20 down to the shoreline of Port Discovery. The soil survey for the site describes the soils as gravelly sandy loam. As seen form the attached soil map, the area has Type "C"soils mapped. See attachment for soil maps and data. Rainfall rates for the area are 1.5"for the 2-year 24-hour storm event, 2.25" for the 10-year, 24-hour storm event, and 3.4" for the 100-year, 24-hour storm event, as seen in Figure 3 from the NOAA isopluvial maps. There are no lakes or ponds on the site. There is a natural Type 4 stream on the property, which requires a 100-ft setback. The property also includes part of the shoreline for Port Discovery. Westall Property—Gradinarmit110!. ' : Stormwater Management Technical Memorandum Page2of4 I I Scope of Grading Work ='vl.DP .'rNT The scope of work is to grade areas of the property for building pads for each of the five buildings, and the associated walkways and parking areas. The building site is already served by an existing driveway to Highway 20. As much native vegetation as possible will be maintained in order to limit stormwater runoff and infiltrate any runoff that is produced. Figure 2 shows the general site plan. Landscaped areas will use amended soil to increase the infiltration and retention of water in the existing soils. Amended soils are existing soils with 4 inches of Grade A composted tilled into them to a depth of 8 to 12 inches. In areas where topsoil has been removed during earthwork activities, a compost soil blend consisting of 2/3 sand and 1/3 compost shall be applied on the ground surface at a depth of 12 inches to provide topsoil for lawn and landscape areas. Compost amended soils have an increased moisture holding capacity. They are able to delay and often reduce the peak stormwater run-off flow rates. These soils hold more moisture in winter, when precipitation in the Northwest is most abundant. Studies by University of Washington (Hielema, 1996) and the City of Richmond, WA (Harrison and Grey, 1997) have found that amended soil plots retain 50 to 70 percent of the runoff volume produced by unamended plots under unsaturated conditions. This essentially turns the amended soil area into"pre-existing forested conditions." Based on StormShed' runoff volumes for a 0.2623 ac area, the pre-existing forested 100 yr. runoff volume for Type C soils is approximately 901 cf, whereas for a typical landscaping area, it is approximately 1912 cf. This is a volume ratio of approximately 47%. Since amended soils have shown they are able to retain 50 to 70 percent of the runoff form unamended plots, ameneded soils essentially allow the existing soil conditions to approach"pre-existing forested"conditions. Minimum Requirements Based on the size and scope of work for the grading project, the project is considered to be "large" in size, and is required to comply with Minimum Requirements#1 through#10. Minimum Requirement #1: Preparation of Stormwater Site Plans. Stormwater site plans have been prepared by 2020 Engineering, Inc. showing the grading areas and erosion control details. Minimum Requirement #2: Construction Stormwater Pollution Prevention. Construction stormwater quality problems are not anticipated since the area will be as minimally disturbed as possible. Newly graded areas will drain into the existing native vegetation following existing drainage patterns onsite. Stormwater pollution prevention measures shall be put in place by the owner/contractor during any site clearing, grading or construction of site improvements. BMPs and methodologies during construction shall follow the guidelines of the SWPPP attached. As appropriate, the SWPPP measures will be located and identified on the civil plans and/or specifications prepared by 2020 Engineering, Inc. The owner/contractor will be required to monitor and maintain the facilities throughout the duration of these site improvements, and will maintain buffers of existing vegetation where possible. Figures 4 and 5 show the TESC site plan and details. 1 Note that for this small of an area,WWHM2 could not be used as it returned an error message"too many zeros"for the flow rates onsite. ("l ' Westall Property—Gradinc, rmit • Stormwater Management Technical Memorandum Page 3 of 4 ; .....: I 1 Minimum Requirement #3: Source Control of Pollution. As a residential area, minimal source controls are expected to be necessary. The following recommendations shall be implemented to minimize the likelihood of discharging pollutants into offsite drainage systems. • Fertilizers, Herbicides and Pesticides. Owner and contractors shall be encouraged to store these items indoors or under roofs, to apply them only during dry (non-precipitation) periods and at doses not exceeding the manufacture's recommendations, and to dispose of them at properly approved disposal sites. Any spillage of chemicals or other hazardous materials shall be immediately reported to Jefferson County and the Washington State Department of Ecology. Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls. The existing site consists of undulating sloping terrain with a bluff sloping down to the shoreline. Most of the property is covered with trees with a brush understory. This native vegetation and current natural drainage to the bay will be maintained as much as possible onsite. A vegetative buffer will be maintained between the steep bluff and the shoreline high water mark, which will be composed of native vegetation. A native vegetation buffer will also be maintained in the area of the Type 4 stream. Minimum Requirement#5: Onsite Stormwater Management. All stream corridors and shoreline areas will be protected from disturbance (BMP T5.20). Roadway grading will be integrated into natural topography as much as possible to minimize the grading volumes and utilize existing drainage systems (BMP T5.21). All stormwater onsite will be infiltrated or utilized onsite. This will include runoff from roofs directed to a raingarden and dispersion trench for infiltration. In addition, runoff may be collected in cisterns or an onsite re-circulating ornamental waterfall and stream feature. Minimum Requirement#6: Runoff Treatment. The new pollution-generating impervious surfaces (parking areas) will exceed the 5,000 square foot threshold requiring treatment. Thus, treatment facilities are required for runoff from these paved areas. Runoff from these paved areas will be directed to a raingarden, a bioinfiltration swale or compost amended soil areas for treatment and infiltration. Figure 6 shows a typical raingarden section. Minimum Requirement #7: Flow Control. Flow control facilities are required if the stormwater discharges directly into freshwater. This site is located along the shoreline, and therefore would discharge directly into salt water. However, to prevent seawater intrusion all stormwater must be infiltrated onsite to the maximum extent possible. Due to these issues, flow control is not required onsite. The site will utilize compost amended soils, a raingarden and dispersion trench, and a bioinfiltration swale to reduce flowrates and infiltrate as much stormwater onsite as possible. A raingarden with an overflow dispersion trench will be used to collect roof runoff. Runoff that cannot be infiltrated in the raingarden section will overflow into a dispersion trench. The trench will slowly release the stormwater runoff via "weep" holes into existing vegetation in order to maintain the natural drainage onsite. Figures 6 and 7 show a typical raingarden detail and dispersion trench detail. Minimum Requirement #8: Wetlands Protection. This requirement only applies to stormwater being discharged directly into a wetland, either directly or indirectly. There are no wetlands onsite. Westall Property-Gradingirmit • Stormwater Management Technical Memorandum Page 4 of 4 i Minimum Requirement #9: Watershed Planning. This site is located next to a shoreline and- therefore must meet any shoreline requirements. To prevent seawater intrusion, all stormwater must be infiltrated or utilized onsite. There are no other known specific basin or watershed concerns. The LID design standards that will be used for impervious surfaces will limit the impact of stormwater flows, both in quantity and quality. These include compost amended soils, a raingarden, and a bioinfiltration swale. Minimum Requirement #10: Operation and Maintenance. The project stormwater facilities requiring special maintenance are the raingardens. Specific operation and maintenance guidelines for these are in the attachment of this memorandum. References Hielema, Eric,1996. Hydrologic Simulation of the Klahanie Catchment, King county, Washington, With and Without a Landscape Consisting of Soil Amended with Compost. Masters Thesis submitted to the College of Engineering, University of Washington. Seattle, Washington. Harrison, R.B., M.A. Grey, C.L., 1997: Field Test of compost Amendment to Reduce Nutrient Runoff. Prepared for the City of Richmond, College of Forestry Resources, University of Washington, Seattle, Washington. DEC 1 - 2006 Jr:VC!_OPMENT 1. `VICINITY MAf�-- NTH . } . -.. . _ .-1 0., SEND _ ' Q DECEC 1 2n1 PORT TOWNSE►. ro EVEL►•MENT Cfr PO' �{ /Iallau1IIIIIIIIIIIIIIINlk HADLI E K� I 4 ,H 4 Jefferson � PROJ li f � f ) i 71 SIT K,ACUM 1 ' LOCATION MAP -- NTS 901063001 90/d61ar 9010E:G018 9010190401 901083001 901063001 '� �.^, RSON CAKE RD l 901064018 9010344i I I} 90108001 401 17 J 90„1,OC6 tir - - _941r111002 991111002 �°°„1,008 ANDERSbN 1 1"� LAKE RaAD 901113002 gq,.;+0, o�9olrlra ! ., ) I A z,. , 1,/,\ ..... �ffTf L 901171004.," �''' 90116200, 90„7100t ,/,,. SUNSE I ,7 : KEROi D `/; , 90<i73(%)2 I ,; j' 1 901171007 • 931172001 'V0 90117 "2 a 90i,11W9 — 3 Y 0 a0103006 I s 901171014 rI Jli ' 901173002 I 1 67 90i173002 90,11a072 1 90171[04 j ) \ /� 96117�011 I ,X•I+E y_Ci^ DESIGNED. M. BUEHRERHRER WESTALL RESIDENCE �"� DESIGNED BY:M. BUEHRER DATE 8-10-06 l DRAWN BY: R. KOPKA DATE: 8-10-08 im �� 2020 ENGINEERING,Inc CHECKED BY: M. BUEHRER DATE: 8-10-06 FIGURE 1 PROL MNGR: PROD. 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N.�N.�..�!, ..•' 're/- ittlih •Valk,he!t:44:Ns wo!iAi:N s..�! Nsii�itttN..4•iN�:e% IL AG A�.aA'4\ . -v z •• •. .--� TO DISPERSION TRENCH \ (SEE DETAIL 1) 14"WASHED ROCK PROFILE (3/4"-1-1/2") AND/OR EXISTING TYPICAL RAINGARDEN DETAIL SANDY GRAVEL SOIL NTS ENGINEER: M. BUEHRER SHEET: DESIGNED BY:W. BUEHRER DATE: 9-14-06 WESTALL RESIDENCE DRAWN BY: R. KOPKA DATE: 9-14-06 1 r �� 2020 ENGINEERING,Inc. 1 CHECKED BY: M. BUEHRER DATE 9-14-06 FIGURE 6 PRE, MNGN: 4 Ru r AMENDED SOILS AND GF PRE NO: Drainage ,..,,....................•.......--,-.,.. RAINGARDEN DETAILS 1 FILE NAME Drolnoye Dsto,7e.dr9 c N c ry ••'^^" SCALE: NTS • 12"x12"CB 4'x8'CONCRETE 12"x12"CB 2'x8'PLASTIC LUMBER LEVEL SPREADER 24" 2p°I0 M /`'\`,\`/ LEVEL SPREADER 24" 20°I°M, �//`//\��/\�� 2p ° i`�i`:� ',1 1,, iiii ��O. • 0•,141, i�\`000 Z`�/\\�/\�\\�/\\�/\\�A'.. .;1 4/./.\\/�,e. 1 ,\\/\`//`\//\// /`//\.-1+ �di/i/i/i ,\\\\oo\\oo\\o\\.!.• O IIIIIIIIIIIIIIIIIII1 . , ///,/,/,/,/,/,,1• IIIIIIIIIIIIIIIIIII, iiiii. i1``G`�/`` = \\\\\\/i\\/i\\/i\\/i\\/i\\/i\\/i\\'i %ii.,7\//� cfl ♦\\////,/////////\•�1 ,•0\ `\ `\\\\\ ;'rd g'` //\///\ idr r.ii..?"...r ��\ CO \`//\,/\\,/\\//\\//\�W V �L£•�7 rs�✓`\/ \//` ;�\`r.�rE�Yri1r•�Z��r bi' // // v,, . • ,..,�\ \\\ 4 r r r• r r \ •s�r'�S Nye) N;� \, REBA' .rite setrc .1. / O rsfrw•,r'*11411e.,1.� SUPPORT @l:� .11. •/</-`� >�\��\� %.// WASHED ROCK WASHED ROCK SECTION A-A(WITH CONCRETE) SECTION A-A(WITH PLASTIC LUMBER) NTS NTS NOTES: ` 1.THIS DISPERSION TRENCH '',,,.`3":; SHALL BE CONSTRUCTED SO ?rcr�" 1 I`'" AS TO PREVENT POINT DISCHARGE AND/OR EROSION. _ 2.TRENCH AND LEVEL SPREADER REBAR SUPPORT I :EVE.IIOPME, MUST BE LEVEL. ALIGN TO (PLASTIC LUMBER 24" --- FOLLOW CONTOURS OF SITE. OPTION,TYP.) 3. PERFORATED PIPE SHALL HAVE I I END CAP OR PLUG(TYP.) (2)1/2"0 HOLES AT 12"C/C(MIN.) AjM 4.WASHED ROCK SHALL BE CLEAN ,'.��.��} � CLEAN OUT WYE FROM PIPE 3/4"-1-1/2"PJ .►�ayf•:�1f:5 (TYP.) 5. MINIMUM LENGTH OF DISPERSION %,ail,•r. TRENCH SHALL BE 30' 4, 'sre•''';! 4"PERFORATED PIPE LAID FLAT 6. 18"(MIN.)#4 REBAR TO BE PLACED AT +!d tii! CENTER OF LEVEL SPREADER AND @ . '!' -VI 12"x12"CATCH BASIN 6.5'O.C. • ,ry =f4%�!�7 (PLASTIC OR CONCRETE BOX) G F\ IAA.w "PIIL +� i A � � _1II 2'X8'PLASTIC LUMBER « �6' • 1 2„ I WITH 1"NOTCHES 'i k0 NOTCHED LEVEL t.J4 +�WII SPREADER ift r�?;r;�,,�4 4"INFLUENT PIPE • I. TOP OF (SEE DETAIL) •IIP ar; .,Lp,I r.�� s�"is �'is:s1�,1� REBAR WASHED ROCK ' ,, j;A �i1 SUPPORTS . 0 r" r LEVEL SPREADER NTS PLAN NTS DISPERSION TRENCH DETAIL NTS Q1gNEER: M. BUERER WESTALL RESIDENCE SHEET: DESIGNED BY:M. BUENRER DATE 9-11-06 — DM BY: R. KOPKA DATE 9-11—OB C. 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Soil Survey of Jefferson County Areaaashington V 1estfall Property-----1 Map Unit Legend Summary DEC 1 — PT I Jefferson County Area, Washington ,FVELoPr,MEI Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI a• A1derw.00d gravelly sandy 4.1 0.9 tgatn, 13 to 30 percent slopes BaD Beausite gravelly sandy loam, 155.7 33.5 15 to 30 percent slopes , n4 u4txe Rock outcrop 56.0 12.0 , t 0� plea,0 to 50 percent slopes CmC Clallam gravelly sandy loam,0 7.2 1.6 to 15 percen,,t slopes 6.0 ',-:'‘,4,:'..'`1,6.ii.i.,4,"P„,,!i"•;14.--'4,,,:,s_1i$/,V 2"., ,,.'1'6,..r;,,r:*1:,, N na 5 y k tph'1 i x- ,," ten 27.8 f rT``i'Jt ' u s rk 7� W Water 0.1 0.0 USDA Natural Resource Web Soil Survey 1.1 7/23/2006 aillil Conservation Service National Cooperative Soil Survey Page 3 of 3 it N C 4) 4) a) N N 4) 4) 4) a) a) 4) N a) 4) -,-, C c C C C C C C C C c C C C - �ilVi a) O O o O O o 0 o O o o O o o O iL O Z Z Z Z Z Z Z Z Z Z ZZZZ D a) L r C LL O a) O) — 'p a __°o c4'r'l.013F,1E LL _ E O '' 12, S i l I I l i 1 1 I 1 0 o O_ a) >-. 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CO C —, LL 2 Q 2 0 LL 2 Q 2 0 -co O C 7 I I i O co o s t. o O 0 0 13 I =• m z • 6) ir 6 O CA O G �y O R d co 6 y H o IQ O ca. z Cid co 2° Q N co N W • • _ MAINTENANCE REQUIREMENTS WESTALL RESIDENCE DRAINAGE FACILITIES RAINGARDENS(BIORETENTION) • The flow entrances to the raingarden shall be inspected periodically and after large storm events. Soil, plant material and/or mulch shall be replaced if any erosion has occurred. Mulch in the raingardens serving parking lots shall be replaced annually due to the heavier pollutant loading. • The catch basins within the raingardens shall be inspected annually, or after any extreme storm event (2-inches or greater within 24 hours). If sediment or debris accumulates more than 12 inches in the bottom of the catch basin,it shall be removed to an approved disposal location. Any debris blocking catch basin grates shall be immediately cleared. • Ongoing weeding, watering as necessary, erosion and sediment control, and replacement of dead plant material shall be provided for a minimum of three years after installation to achieve an 80 percent survival rate of all plantings. The site vegetation shall be trimmed only as necessary to maintain the aesthetic appearance of the sites and to keep the raingarden free of leaves and other accumulated dead vegetation. Poisonous or nuisance vegetation within the raingarden shall be removed. Slope areas that are bare shall be revegetated and any eroded areas or holes shall be filled and regraded prior to revegetation. • If vegetation falls below the 80 percent level, new vegetation shall be planted to bring the total percentage back up to that level or higher. Added vegetation types shall be changed as necessary if it is determined that the original planting scheme is unable to survive at the 80 percent level over an extended period. • Any accumulated sediment shall be removed immediately,in order to maintain functional capacity and adequate freeboard,and disposed of at an approved location. • No nutrients or pesticides shall be applied to the raingardens. STORMWATER POLLUTION PREVENTION PLAN for Westall Property Prepared for James Westall c/o Skookum 385 Benedict St. Port Townsend, WA 98368 September 2006 Prepared by E N G I NJ E E P I N G 2020 ENGINEERING, Inc. 700 Dupont Street PO Box 1621,Bellingham,WA 98227 (360) 671-2020 Fax(360) 671-0322 Westall Property-SWPPP 1 September,2006 • PROJECT DESCRIPTION This project involves the construction of a residential area consisting of five buildings and associated walkways, parking areas and driveways. The purpose of this SWPPP is to provide guidance to the owner/contractor and the owner/contractor's dedicated erosion control lead in minimizing erosion and sedimentation problems due to this project. The owner/contractor is responsible to implementing all appropriate measures to meet County, State and Federal guidelines regarding water quality. This SWPPP, in conjunction with the civil plans by 2020 Engineering, Inc., describes the minimum starting measures to implement. However, additional measures may be needed based on the actual onsite performance of BMPs and the schedule and techniques used by the contractor. Contact information is provided below, and should be amended as appropriate. Project Owner: Civil Engineer: 2020 Engineering, Inc. _ P.O. Box 1621 `^I _..} a1 Bellingham, WA 98227 Phone: (360) 671-2020 Contractor: . D L C 1• ,;:`•i ,.OP ENT Erosion Control Lead Person: Phone: Email: Fax: A copy of this SWPPP, a list of the appropriate contact persons, and copies of completed inspection forms shall be maintained onsite at all times during the project. Westall Property-SWPPP 2 September,2006 • EXISTING CONDITIONS Location. The project is located in on the Quimper Peninsula, south of Port Townsend in Section 17, Township 29 North, Range 1 West, W.M. Jefferson County, Washington. Topography. The entire area encompasses approximately 6 acres, with the project site covering approximately 1.4 ac. The site slopes generally from west to east, with slopes from approximately 10 to 30%. Land Cover and Soils. The land is currently undeveloped. The underlying soils are characterized in general as a sandy loam or silt loam. The site has mostly hydrologic group "Type C" soils, as described by the SCS Soils Manual for Jefferson County Area, Washington. The property lies along the Port Discovery shoreline. Structures and Utilities. It is the contractor's responsibility to locate any onsite and adjacent utilities. The one-call utility locate number is 1-800-424-5555. There is a former railroad grade through the west end of the property. Onsite Drainage Description. The majority of current surface runoff sheetflows down the ridge to the shoreline over native vegetation areas and is either infiltrated or flows offsite into Port Discovery. Contributing Offsite Areas. Due to the slopes and the location of Highway 20, no stormwater runoff will flow onto the site from offsite areas. Downstream Conveyance. Any stormwater runoff that is not detained onsite travels southeast off of the site to Port Discovery. Westall Property-SWPPP 3 September,2006 --- • • PROPOSED CONDITIONS The scope of work is to grade building pads for each of the five buildings, and the associated walkways, parking areas, and driveway access to Highway 20. As much native vegetation as possible will be maintained in order to limit stormwater runoff and infiltrate any runoff that is produced. Landscaped areas will use amended soil to increase the infiltration and retention of water in the existing soils. Amended soils are existing soils with 41 inches of Grade A composted tilled into them to a depth of 8 to 12 inches. In areas where topsoil has been removed during earthwork activities, a compost soil blend consisting of 2/3 sand and 1/3 compost shall be applied on the ground surface at a depth of 12 inches to provide topsoil for lawn and landscape areas. • Westall Property-SWPPP 4 September,2006 • EROSION AND SEDIMENTATION CONTROL Temporary erosion and sedimentation controls (TESC) and Best Management Practices (BMPs) will be used to mitigate potential erosion and sedimentation due to constru '.._-- activities. A detailed summary of the suggested minimum s or7 aiid-sed Sri ptation `! control elements follows below: ! Element #1 1 Mark Clear Limits Prior to beginning land-disturbing activities, including clearing and grading, all work limits shall be marked. Areas to be marked include the roadway areas and their associated drainage facilities (infiltration trenches). Either wood lath stakes or painted ground surfaces may be used to mark the limits. Element#2 Establish Construction Access Any new construction access points required off of Highway 20 shall have stabilized quarry spall construction entrances (BMP C105) meeting Jefferson County standards. In addition, the adjacent roadway areas shall be cleaned at the end of each day, with swept up materials deposited in a controlled onsite sediment disposal area, or an approved offsite disposal location. Element #3 Control Flow Rates Temporary sediment traps or ponds (BMP C240 or BMP C241) shall be built if necessary to collect any surface runoff during construction to prevent sediment laden runoff from reaching offsite areas, streams or other water bodies. Siting of the traps or ponds shall be at locations where overflow can discharge into existing vegetated areas. Element #4 Install Sediment Controls The owner/contractor shall endeavor to maintain any natural vegetation in as undisturbed condition as possible. Where work is performed, the following BMPs may be used to control runoff: • Straw Bale Barrier (BMP C230). Use as a temporary emergency measure, as straw bales do not last long under heavy flow conditions. • Silt Fence (BMP C233). Place silt fence parallel to contours between work areas Westall Property-SWPPP 5 September,2006 and protected areas, and around exposed infiltration surfaces under construction. • Straw Wattles (BMP C235). Place where surface flow begins to channelize, to slow runoff and allow sedimentation. • Sediment Trap (BMP C240). Construct as needed to prevent dirty runoff from reaching the wetland or offsite areas. Element#5 Stabilize Soils Any exposed soils unworked for a significant period shall be stabilized using effective cover BMPs. Between October 1 and April 30, no exposed and unworked soils shall remain unstabilized for more than two days. Between May 1 and September 30, no exposed and unworked soils shall remain unstabilized for more than seven days. Soils planning to be exposed and unworked for greater than one month shall be temporarily seeded (BMP C120) or sodded (BMP C124), with adequate protection provided to stabilize the soil until the vegetation is established. Stockpiles and areas exposed for shorter periods may be stabilized using appropriate measures from the following BMPs. • Nets and Blankets (BMP C122) • Plastic Covering (BMP C123) ------ • Surface Roughening (BMP C130) • Gradient Terraces (BMP C131) • Dust Control (BMP C140) Element#6 Protect Slopes `s ssor win Steep slopes or landslide hazard areas shall have a undisturbed vegetated buffer to protect them. The buffer shall follow requirements set forth in the land use permit. On stockpiles and ditches or temporary embankments, appropriate measures from Element #5 shall be used to minimize erosion. Element#7 Protect Drain Inlets Any drain inlets (catch basins) shall be protected by placing storm drain inlet protection (BMP C220) at each catch basin. Each basin shall be inspected weekly, and daily during significant storm events. Inlet protection shall be cleaned or replaced prior to the accumulation of six inches of sediment. Westall Property-SWPPP 6 September,2006 9 r. Element#8 + - E Stabilize Channel and Outlets Any outlets from temporary or permanent stormwater pipes or facilities!shall be armored _:.EvE'°'"::t±t with rocks or quarry spalls to prevent scour and erosion (BMP C209). Element#9 Control Pollutants All potential pollutants, including but not limited to wash water, human wastes, chemicals, oils, fuels, vehicular lubrication and cooling fluids, miscellaneous trash and waste materials, demolition debris, pesticides, herbicides, and fertilizers shall be handled in such a manner to prevent contamination of stormwater. Stored hazardous materials shall be protected from vandalism, covered, and have spill containment in place, including plastic or other ground cover to minimize the opportunity for any spilled materials to infiltrate into the porous soils. Any spillage of hazardous materials into surface waters or into the ground shall be immediately reported to Jefferson County, the Washington State Department of Ecology, and other appropriate state or federal authorities, and immediately contained. Pesticides, herbicides or fertilizers shall not be applied during or immediately prior to expected precipitation events, and application shall follow the manufacturer's recommendations. Element#10 Control De-Watering De-watering water from trenches or other excavations shall be discharged across undisturbed vegetation areas, to allow dispersal and infiltration, or into previously constructed temporary sediment traps (BMP C240). De-watering water shall not be allowed to discharge directly onto offsite areas, except as approved by the offsite owners. Element#11 Maintain BMPs All temporary and permanent erosion and sediment control BMPs shall be maintained repaired and enhanced as necessary to assure continued performance of their intended functions. Except as previously noted, all BMPs shall be inspected at a minimum on a weekly basis, and during or immediately following a significant storm event (any storm exceeding 0.5 inches rainfall within 24 hours, or 2.0 inches of rainfall within 7 days). Within 30 days of final site stabilization or when no longer applicable, temporary BMPs shall be removed from the site. Any accumulated debris and sediments shall be disposed of at an approved onsite or offsite location, and each BMP site itself shall be permanently stabilized. Westall Property-SWPPP 7 September,2006 • • Element#12 Manage the Project The grading work shall begin only after any needed temporary sedimentation and erosion control BMPs have been put in place. Soil disturbance shall be avoided during precipitation events, and priority shall be placed on maintaining existing vegetation in work areas as long as possible. The owner/contractor's erosion control lead shall follow the previous elements of this SWPPP, the erosion control requirements from the plans, and any requirements of County, State and Federal agencies. If circumstances require additional BMPs beyond those recommended in this SWPPP to prevent construction caused contaminated runoff from leaving the project site or contaminating the onsite infiltration facilities, it is the owner/contractor's responsibility to implement those additional BMPs. Note that the proposed raingarden and dispersion trench areas are infiltration facilities. Thus, a priority of the contractor shall be to prevent silt, sediment or debris laden water from reaching the infiltration surfaces of these facilities throughout construction of the facilities and the rest of the site, so that the permanent functionality of the infiltration facilities are not impaired. The erosion control lead shall also keep a weekly log of BMP inspections, noting any problems, repairs performed, or additional BMPs used. A sample weekly inspection form is attached on the following page. Copies of this SWPPP and completed inspection forms shall be maintained onsite at all times during the project. The owner/contractor shall be aware that the Washington State Department of Ecology has the authority to levy significant fines against the project owner if runoff exceeding allowed contaminant levels due to any onsite or project activity is found to be discharging from the project site. SWPPP DRAWINGS • Approved Civil Drawings with TESC Information (by 2020 Engineering, Inc., to be attached upon approval by Jefferson County) r. � — I �, Westall Property-SWPPP 8 September,2006 • SAMPLE SWPPP INSPECTION FORM WEEK STARTING: Name of Erosion Control Lead: Weather Comments: Condition of Site and BMPs: Exposed Soils: Silt & Construction Limit Fencing: Quarry Spall Entrances: Adjacent Roadways and Properties Catch Basin Protection: Sediment Traps and Ponds: Stockpiled Materials: Other BMPs: Repairs Made: New BMPs Installed: Other Comments: J ` Westall Property-SWPPP 9 September,2006 I )cklf NTJ • SECTION II—EROSION AND SEDIMENT CONTROL PLAN Sediment and erosion control measures may be depicted on the master land use application plot plan,a stormwater site plan,and/or a separate Construction SWPPP site plan. This is a checklist to ensure that the following are depicted on a site plan: 1. General. a. Vicinity Map b. Jefferson County Approval Block c. Erosion and Sediment Control Notes 2. Site Plan. a. Legal description of subject property. b. North arrow. c. Indicate boundaries of existing vegetation (e.g.,tree lines,pasture areas,etc.). d. Identify and label areas of potential erosion problems. e. Identify FEMA base flood boundaries and Shoreline Management boundaries(if applicable). f. Show existing and proposed contours. g. Indicate drainage basins and direction of flow for individual drainage areas. h. Label final grade contours and identify developed condition drainage basins. i. Delineate areas that are to be cleared and graded. j. Show all cut and fill slopes indicating top and bottom of slope catch lines. 3. Conveyance Systems. a. Designate locations for swales, interceptor trenches,or ditches. b. Show all temporary and permanent drainage pipes,ditches,or cut-off trenches required for erosion&sediment control. c. Provide minimum slope and cover for all temporary pipes or call out pipe inverts. d. Shows grades,dimensions,and direction of flow in all ditches,swales,culverts and pipes. e. Provide details for bypassing off-site runoff around disturbed areas. f. Indicate locations and outlets of any dewatering systems. 4. Location of Detention Best Management Practices(BMPs). Identify location of detention BMPs. 5. Erosion and Sediment Control Facilities. a. Show the locations of sediment trap(s),pond(s), pipes and structures. b. Dimension pond berm widths and inside and outside pond slopes. c. Indicate the trap/pond storage required and the depth,length,and width dimensions. d. Provide typical section views through pond and outlet structure. e. Provide typical details of gravel cone and standpipe,and/or other filtering devices. ,! ( �` t f. Detail stabilization techniques for outlet/inlet. g. Detail controVrestrictor device location and details. II h. Specify mulch and/or recommended cover of berms and slopes. "' i. Provide rock specifications and detail for rock check dam(s),if applicable. j. Specify spacing for rock check dams as required. _+ k. Provide front and side sections of typical rock check dams. iI I. Indicate the locations and provide details and specifications for silt fabric. m. Locate the construction entrance and provide a detail. 6. Detailed Drawings. Any structural practices used that are not referenced in the Ecology Manual should be explained and illustrated with detailed drawings. 7. Other Pollutant BMPs. Indicate on the site plan the locations of BMPs to be used for the control of pollutants other than sediment(e.g.,concrete wash water). 8. Monitoring Locations. Indicate on the site plan the water qual ty sampling locations to be used for monitoring water quality on the construction site. Sampling stations should be located upstream and downstream of the project site. stormwater site plan template—rev.10/1/2003 11 IIP, • • STRATUM GROUP 1451 Grant Street, Bellingham, WA 98225 Phone(360)714-9409 January 3, 2007 Bill Irvine 1980 Cape George Road Port Townsend, WA 98368 Re: Geology Review of Stormwater Plan MLAI: MLA06-00651, Case #: BLD06-00678 Jefferson County, Washington Dear Mr. Irvine: I received a memo from Michele Farfan of Jefferson County Department of Community Development regarding the stormwater plan for the proposed development at Warren Westfall's property. Jefferson County requested that I review the stormwater plan for consistency with my geology evaluation of the property that was completed in November 2003. I have reviewed the stormwater plans for the site prepared by 2020 Engineering and spoke with the Jennifer Ramsey the project manager at 2020 Engineering regarding the stormwater plan. The stormwater plan will disperse stormwater runoff on the site in a manner consistent with the recommendations I made in my November 2003 report. Buildings 1, 2 and 5 and driveway areas will discharge stormwater in a dispersed manner into areas of amended soil and into existing natural swales with existing natural infiltration. Building 4 will discharge stormwater into a raingarden with and subsequently into a dispersion trench and onto an existing gravel road drainage route that will convey water to the base of the slope where it will infiltrate behind into the ground behind the old railroad grade on the west side of the property. The stormwater plan drawing indicates that Building 3 will direct its storm water into the raingarden planned between Buildings 3 and 4. The only change I recommend is that half the stormwater from Building 3 be directed towards a dispersion trench located south of Building 3 towards the existing natural infiltration area. Stratum Group appreciates the opportunity to be of service to you. Should you have any questions regarding our reconnaissance please contact our office at(360) 714-9409. Sincerely yours, : , Stratum Group �p'i Wasf!% �� I,co fir.. +\\.,. ` p r�.. t , Dan McShane, M.Sc., L.E.G.01---- , tirf . JAN - 8 2007 LL_-_, Licensed Engineering Geologist ` , , " , , .� . . 7 w� p �-_ • gill i z I m LL -#-.8 ! 2 i Ce m m L7Fgvs Y J J l O �Qg�� a 3 v�i 5z� ., 4Fo40 CZg ta 8 Luj z a :I Q o L.L. �� �� 8o$$ �z�,3 o g zP Q F x ¢ n ? Ow w `�' 2 o f �0 w q z a n >6 \ W ° w vop2FigOgZI o>ty%S.o.. E �/ $ � — g� ri Z�Cr l-i O55 D�aW_LUaO 00040IX003 — • .� a ...• s$`� � t� I 1 ° G ' I • i 4* -J I q • .%-• s'r• - i ..s> 40 .-\" - \.\ z t �. 6�j ';� ` . JAN 8 2007 ILL. 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