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Home My WebLink AboutSEP2005-00003 Loudin Grading Project - SEP Letters / Memos - 1/25/2005 STATE �889 RECEIVED M STATE OF WASHINGTON DEPARTMENT OF ECOLOGY PO Box 47775 • Olympia, Washington 98504-7775 • (360)407-6300 January 25,2005 TO BE KEPT IN THE ncn 0 PARCEL FILE Mr. Rick Mraz Your address Mason County is in the Department of Community Development Kitsap Planning Division watershed PO Box 279 Shelton,WA 98584 Dear Mr. .Mraz: Thank you for the opportunity to comment on the mitigated determination of nonsignificance for the Loudin Grading Project(SEP2005-00003)located two miles down Old Belfair Highway on the right as proposed by Chet Loudin. We reviewed the environmental checklist and have the following comments: TOXICS CLEANUP: Chuck Cline(360)407-6267 If contamination is currently known or observed during construction,sampling of the potentially contaminated media must be conducted. If contamination of soil or groundwater is readily visible,or is revealed by sampling,the Department of Ecology must be notified. If operation of the system results in a release of petroleum hydrocarbons considered to have concentrations greater than Model Toxics Control Act cleanup levels,please contact the Environmental Report Tracking System Coordinator at the Southwest Regional Office at(360)407-6300. For assistance and information about subsequent cleanup and to identify the type of testing that will be required contact Mr. Chuck Cline at(360)407-6267. WATER QUALITY: Betsy Dickes(360)407-6294 Any discharge of sediment-laden runoff or other pollutants to waters of the state is in violation of Chapter 90.48, Water Pollution Control,and WAC 173-201A,Water Quality Standards for Surface Waters of the State of Washington,and is subject to enforcement action. Waters of the state include but are not limited to waters in roadside ditches and storm drains. Erosion control measures must be in place prior to any clearing,grading,or construction. These control measures must be effective to prevent stormwater runoff from carrying soil and other pollutants into surface water or storm drains that lead to waters of the state. Sand, silt,clay particles, and soil will damage aquatic habitat and are considered to be pollutants. Soil in stockpiles should be stabilized or protected with sediment-trapping measures to prevent soil loss. All exposed areas of final grade or areas that are not scheduled for work,whether at final grade or otherwise, shall not remain exposed and un-worked for more than two days,between October 1 and April 30. Between May 1 and September 30,no soils shall remain exposed and un-worked for more than 7 days. Source control best management practices such as plastic covering,mulch,temporary seeding, and phased clearing(for example)should be used to control erosion during construction. More examples of effective source control Best Management Practices can be found in Washington Department of Ecology's two January 25, 2005 Page 2 stormwater management manuals,Stormwater Management Manual for Puget Sound(1992) and Stormwater Management Manual for Western Washington (2001). Cut and/or fill slopes should be designed to minimize erosion. Methods such as slope roughening, terraces, or pipe slope drains may be used. During construction,all releases of oils,hydraulic fluids, fuels,other petroleum products,paints, solvents, and other deleterious materials must be contained and removed in a manner that will prevent their discharge to waters and soils of the state. The cleanup of spills should take precedence over other work on the site. It is not clear from the SEPA review if the total area to be graded and worked will amount to 1-acre or more. So,the following information is being included for your review and assessment: As of March 10 2003, federal law requires all sites where soil disturbance will be one acre and larger to obtain an NPDES stormwater permit if the site has the potential to discharge to surface water. However, Ecology has been using enforcement discretion with un-permitted sites that are 1-5 acres in size, since we have not revised our general permit yet to address 1-5 acre sites. We expect to revise the permit later this year and it will probably go into effect by September 2005. In the mean time,operators of 1-5 acres sites that want to get a permit now to meet federal requirements and minimize Clean Water Act liability may do so by using our current NPDES construction permit for sites 5 acres or greater. An application form can be downloaded from http•//www ecy.wa goy/programs/wcL/stormwater/construction/#Application or you can contact Linda Matlock directly at(360)407-6437 If you have any questions or would like to respond to these comments please contact the appropriate reviewing staff listed above. Department of Ecology Southwest Regional Office (AW: 05-0224) cc: Chuck Cline,TCP Betsy Dickes,WQ Linda Matlock,WQ/HQ Chet and Deborah Loudin(Applicants) IN 1b �F P ECG -k -GU 0'6 3 1980 NE Old -- - - -- b. Description of Existing Vegetation,aoM'd: Douglas firs,Cedars, � Belfair F E Mason County Clearing and Approval Block and ground cover most of the east third of the o as shown in the _ ---- --------- engineering drawing. This will be left all natural theproperty owners , El.at 18"invert. - ----- Reviewced by: c. Description of Existing Drainage: A/2'diameter culvert under the S / Old Belfair Highway located just outside the northwest corner of the / Existing 18"dia. Approved by: property and then connects to the countys 24'culvert which then goes coo culvert Drainage ditch(swale) ctY into a drainage ditch on the north side of the property and then the to handle overflow conditions Date: surface water runoff flows into an 18"diameter culvert which runs down from the 24"culvert during the middle of the property from the north to south as shown in the drawing. heavy,continuous rainfall �I�r .\` Note: Clearing and grading limits are shown in light blue Finally,the surface water runoff flows into an existing 50'x 100' r d�fJ � in the drawing below. sedimentation pond before flowing into a naturally vegetated drainage VICINITY MAP T 17 dia.culvert ditch(swale) ______________ -_ __._ __ ditch leading to the Union River. .� 4 Paved neigborhood with several paved ar parked vehicles on this side of the - ga. Adjacent Areas `J - ------- ----------- FParcel#12317-41-00050 roadway.(Contributes to surface �Q�? / '' - B L,' C _ 1. Description of adjacent areas which may be affected by water runoff.) �' i p,. 12' a - ' 'F X 118'E1. Proposed drainfield Pmposed dralnlield _ the site disturbance: ,p �. _ oraebklgJG location --,_,_y___-_.JocaEioR , i - a. Streams: The Union River is located at the southeast r (1 --_ corner of the property and an unnamed creek is located v - - outside the west end of the property that flows under the C' 9B E1.. ' ' " X 105'El. - --- - - -- Old Belfair Highway. X 97.1 EL' L\ ;r )(� ) ,-X87.8'El. b. Lakes: There are no lakes in the vicinity of theproperty. This creek has overflowed " 700 84• y X 87.8'El. ey X 104'Ell. c. Wetlands: VVetlarxis are located on the south side of toward the 12'culvert C 17 d _ 1 ed�rea i ; ; '� This area to be left all natural the o al the drainage ditch swale as shown in aF; --el ` property �9 a9 duringthe winter and s �' ' ' consisting of trees and meadow the drawl Appropriate setbacks have been provided Ping -XT � I. X 9ti 61. X 93:7� . Pr` . n9 APPr pr months. for the location of the expanded sedimentation pond. �� -r,4 ,,X g� _ 87- d. Residential Areas: The main residential is located on ----`- -----_ �� -; -- / _ _ an elevated plateau and is not affected by the asphalted ' Peninsula X 6 E�50 x 100' i `v ii X 91. F�e.-- ;, ---- X 86.5'B. -XST�L"-- surfacing project. A24'x 36'house is located at the Trues '; ' /,' northwest corner of the property but will be removed In 50 x 1 � X 891, 9�,;; 1� during the paving operations. A 12'x 57 trailer will remain Y,Qq - -- rnfi ,' '-�--------------- --- ------------------- '" ` ' ,�� located at the west end of the property and is also not / X�i4-7 Ft-3ar 3f�Pg ----- -LL--� --------------- =- --,-u------- 1 - affected by the paving work L=1/----- --------i----f ------ --- __ -- ----X 90' - ______ --------- ---------------- ----- =------- - e. Roads: The Old Belfair Highway runs from the southwest - ----X X er se or - Drainage Bch(�) X 86.6 El. 'X 85.3'EI. to the northeast direction at the outside NW comer of the 95' - - X 86.2 El. \ property as shown. A 12'diameter culvert under the ! fAV _- +-- for 6 month storm Install 2'dia.pipe ---I( _ 7 = X 6��i`EI. -This area to be left all natural highway helps to drain water off the highway and from the to proposed drainfield consisting of trees and meadow unnamed creek located outside the west end of the at NE comer of property 91' / tom'x 308'x 7 settling pond 18"dia.culvert property. 13,�OA eq 1t ,�''--? - Parcel#12317�1 00070 rig �y with 3:1(V H)side slope ;' from 6 high x 18"dia. f. Other: A 50'x 100' truss manufacturing facility will be Existing 12'dia./ pavefut area (refer to attached VVVUHf+A2J -__----ter in settling pond. expanded to 50'x 200'with new asphalt surfacing culvert to be X X 88.4'El.simulation results) � �,f around the building as shown, A 40 x 80 storage removed ,, �`. --'X building is located on the north side of the property with 308'length the 18"culvert running underneath it. 60'setback U"ON RIVER 89 ;, f m wetland - --- IL Description of the downstream drainage path leading from the site Install 12'dia. _____X� %i to the receiving body of water. (Minimum distance of 400 yards.) storm _ - - -- --`-'�Ei' X �` '� 'EI _ Durirg heavy rainfall the surface water runoff flows into a 100'x 200'x 7' REVISED ___ ---- -- _ - J� -- - --------- sedimentation pond and then into a 6'high standpipe which leads to - - -- natural vegetated drainage ditch where the surface water runoff is ---DATE 12--Z o � 2. Project Description further filtered before it flows into the Union River. The vegetated 8T 12 Required Elements for the Construction Stormwater Pollution Prevention Plan a. Total Project Area: 5.75 acres drainage ditch acts as a biofiltration fad lity that runs nearly 300'before 86, b. Total proposed impervious area:4.67 acres flowing to the river. 1. Mark Clearing L.g ftts: Response: Clearing limits are identified in the above drawing c. Total area to be disturbed: 4 48 acres 6. Critical Areas DESIGN GUIDELINES and will be marked by survey stak�rior to construction. a. Description of critical areas that are on or adjacent to the site: 2. Establish Construction Access: Response: Main construction access is already in Existing Site Conditions A relativlely steep embankment is located on the east side of the August 2001 Stormwater Management Manual for Western Washington,August 2001 place and is located on the south side of the existing Peninsula Truss building. g g 9t g proposed paving area that will need to be protected from slides and 3. Control Flow Rates: Response: Refer to the attached Western Washington Hydrological a. Description of the existing topography:The POND SIZING soil erosion during heavy extended rainfall periods. An unnamed Model I I computer simulation results for this basin which automatically sizes the retention general area of the expansion of the paving is located at the outside west end of the property which flows under pond using actual rainfall data starting in 1955 to 1999. It is recommended that construction is relatively level ground with a difference in Computer simulation: Western Washington Hydrological Model version 2(VVWNM2) the Old Belfair Highway but is not affected by the proposed paving takes place during the drier months of elevation fb the year from June through October to minimize eevaon o about 13'with an elevation of 96. with continuous simulation hydrology(HSPF). Predeveloped input(Mason County at 3 project. 1980 Old Belfair :Till forest=5.75 acres,impervious surface=0,71 acres(from surface water runoff during construction. on the north side of the property to 83.5 on the Hwy) pe Hwy), b. Description of special requirements for working in or near critical Post developed input:Till forest=0.79 acres,till grass=1 acre,impervious area(roof) 4. Install Sediment Controls: Response: All bare soil areas will be covered with visqueen south side of the property. The residence lies pe p g pe ( f}= areas: The recommended BMPs for stabilizing the 60 to 70% at the end of each days work during periods of rainfall greater than 1"in a 24 hour periods. on a plateau at an elevation of 104'as shown and/or the use of biodegradable 0.32 acres,streets,sidewalk,parking=3.85 aces,pond=0.5 acres.(Refer to drawing embankment is hydroseeding,mulching, above for details on impervious areas.) Also,bare soils will be immediately protected if this rainfall occurs during the day and soil in the drawing. An embankment at 118'elev. hemp netting to help hold the mulch inplace and to prevent slides and disturbing work will need to stop during this time. lies in the upper mid-section of the property. soil erosion from taking place during heavy rainfall which can be as much Auto pond sizing: Bottom length x bottom width=134.12 x 134.12=17,990 sq.ft. 5. Stabilize Soils: Response: All exposed soils especially on sloped embankments shall b. Description of existing vegetation: A 300' as 8 inches in a 24 hr period for the 100 year rainfall. Actual pond sizing:98'x 198'=19,400 sq.ft.>17,990 sq.ft.(req'd) OK be protected by hydroseeding and/or mulching to prevent soil erosion and slides on the long x 20'wide greenbelt consisting of deciduous steep embankments. trees will be preserved running from east to west 6. Protect slopes: Response: Apply hydroseeding,mulching,and/or visqueen held inplace as shown in the drawing. with sandbags to help protect the slopes along the embankments especially during periods CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN CHECKLIST A- of continuous rainfall,i.e.,1"or greater of rainfall in a 24 hour period. a P. Af EROSION AND SEDIMENT CONTROL PLAN (Reference: August 2001 Stormwater Management Manual for Western Washington} g #,- J G• O 7. Protect Drain Inlets Response: Currently there are no drain inlets or catchbasins on the 4 � F WASy Q� ( �� for Peninsula Truss Company,1980 Old Belfair Iiwy 1. Construction Stormwater Pollution Prevention Elements site to protect. Gj �O I,y q Belfair,WA(Parcel#12317-41-00060) 8. Stabilize Channels and Outlets: Response: An existing sedimentation pond and drainage a. Describe how each of the Construction SWPPP elements has been addressed Prepared for. Chet and Debbie Loudin ditch swales prevent surface water runoff from flowing directly into the Union River. f. ti G � through the Construction SWPPP Answer: Refer to the following 12 elements.. r.� y b, Identify the type and location of Best Management Practices used to satisfy the 9. Control Pollutants: Response: Construction equipment shall be inspected for any oil or P.O.Box 2326 hydraulic leaks and be properly maintained prior to arrival on site Belfair,WA 98528 required element. Answer: Refer to the detailed diagram above the type and locations of the applicable BMPs. 10. Control De-Watenng: p° � groundwater table Response: De-watering is not required since the l� 360 275-7422 C is located below the bottom of the catchbasins. Prepared Morta Engineering and Testing c. Written justification identifying the reason an element is not appicable to the proposal. 30758 � by: � n9 n9 11. Maintain BMPs: Response: Hydroseeding and mulching will be maintained especially PO.Box 250,Ocean Shores,WA 98569 Answer:Refer to the following 12 elements. O FC;ISIFR� during periods of heavy extended rainfall periods. --Sept. t 12. Manage the Project: Response: The owner will be responsible for managing this project S! _______ __ and ensuringthat the Construction Stormwater Pollution Prevention Plan is r thoroughly i tented this construction SWPPP. properly and S G Rev. Dec. 16'2004�) ( )289-9682 fax ONAL� r - I2004 I Designed SPM Sheet 1 of 2