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HomeMy WebLinkAboutBLD2003-00636 • BUILDING PERMIT APPLI MLA03-00564 TION Review Type: I Jefferson County Department of Community Development 621 Sheridan Street Port Townsend, WA 98368 PERMIT #: BLD03-00636 Received Date: 10/1/2003 SITE ADDRESS: l 3'l"C OLD FORT TOWNSEND RD PORT TOWNSEND, 98368 OWNER: STATE OF WASHINGTON PARKS AND R PHONE: 425-453-5005 EX DEREK GUSTAFSON 220 N WALNUT ST BURLINGTON WA 98233-1138 SUBDIVISION: Block: Lot: PARCEL NUMBER: 001223002 Section: 22 Township: 30 N Range: 01 W CONTRACTOR: LARRY BROWN CONSTRUCTION INC PHONE: 360-734-8872 1825 MT BAKER HWY BELLINGHAM WA 98226 Contractor's License LARRYBC099BP Expires 12/05/2003 REPRESENTATIVE: BURT MILLER PHONE: 426462_6066 CH2M HILL PO BOX 91500 PROJECT DESCRIPTION DEMOLITION - RESIDENCE TYPE OF WORK MOB SQUARE FOOTAGE: TYPE OF IMP DEM VALUATION MAIN: CODE EDITION: 1997 ADD'L: HEAT TYPE: OCCUPANCY: HEAT BASE: HEAT TYPE: OCCUPANCY: UNHEATED: #OF STORIES: CONST TYPE: OTHER: SHORELINE: CONST TYPE: GARAGE: SETBACK: DECK: BANK HEIGHT: SEWAGE DISPOSAL: WATER SYSTEM: PARCEL TAGS: YES NO BEDROOMS: BATHROOMS: STORMWATER: YES NO AREA Exist: Exist: Wetland Erosion Prop: Prop: Seismic Streams Total: Total: Flood Way Floodplain Routing Date: D J F&W Landslide 1 ?56-QShoreline Aquifer Forest: Commercial Rural Type Amount Paid By: Date: Receipt: A pved/Date Permit $0.00 ZAN 10/08/03 ®� State Building Code $0.00 ZAN 10/08/03 Total: $0.00 DEC 1 7 2003 Jefferson County Planning & Building Department 7tJiUO1'5C CC • • DEMOLITION PERMIT Jefferson County Department of Community Development 621 Sheridan Street, Port Townsend, WA 98368 (360)379-4450 FAX (360)379-4451 PERMIT #: BLD03-00636 Received Date 10/1/2003 SITE ADDRESS: 1370 OLD FORT TOWNSEND RD Issue Date 12/17/2003 PORT TOWNSEND, 98368 APPLICANT: STATE OF WASHINGTON PARKS AND REC PHONE: 425-453-5005 EX DEREK GUSTAFSON 220 N WALNUT ST BURLINGTON WA 98233-1138 SUBDIVISION: Block: Lot: PARCEL NUMBER: 001223002 Section: 22 Township: 30N Range: 01W CONTRACTOR: LARRY BROWN CONSTRUCTION INC PHONE: 360-734-8872 1825 MT BAKER HWY BELLINGHAM WA 98226 Contractor's License LARRYBC099BP Expires 12/05/2005 OWNER, STATE OF WASHINGTON PARKS AND REC PHONE: 425-453-5005 EXT f if different: DEREK GUSTAFSON 220 N WALNUT ST BURLINGTON WA 98233-1138 PROJECT DESCRIPTION: DEMOLITION - RESIDENCE THIS PERMIT IS VALID FOR ONE YEAR AND IS NOT RENEWABLE. THE FINAL INSPECTION MUST BE SCHEDULED AND PASSED WITHIN THAT YEAR. THE EXPIRATION DATE IS 12/17/2004. REQUIRED INSPECTION: ['}/ FinalApproval: , _ tG ""i 7 e7,..c BUILDING INSPECTION HOT-LINE 379-4455. CALL 24 HOURS IN ADVANCE TO SCHEDULE INSPECTIONS. Office Hours 9:00 a.m. -4:30 p.m. SPECIAL CONDITIONS APPLY - SEE REVERSE HOT LINE AVAILABLE 24 HOURS A DAY • JEFFERSON COUNTY COMMUNITY DEVELOPMENT, 621 SHERIDAN ST, PORT TOWNSEND WA 98368 PH: 1360) 379-4450 DEMOLITION PERMIT APPLICATION SITE ADDRESS:911#/ROAD NAME 2-0CD 3AT7 ./- V tc.O,,CE`7'1 ?'R7 7©WA/5CA/ / LA/A ZIP / gi3 .-56t3 9 DIGIT PARCEL ID NUMBER ,CC�/22 3 pe)2. Legal Description: Subdivision Name Block Lot(s) Section 2 2- Township 3O North, Range 1 WM E.�EK /- o F50/4� •� G,/, /1i TON 57;47— � APPLICANT PA K6 i'{it/A jam' C./e-e-st7/ ',A�/ PHONE .360 - 7J`1 5 �0 MAILING ADDRESS 42 Q A/, I,C/A LAlLJ7' 5772,c r 7- //.2L./Ai 7-0A1"J lAii4 ZIP 99 3 PROPERTY OWNER .574 ffe A 6 AAoi/f PHONE MAILING ADDRESS ZIP CONTRACTOR LA/e/e`/ 8&oix,,, C 57 4,crez,ii PHONE 3Cod - 7 3 4 - oe 72 MAILING ADDRESS /8z'rj /v/T. 23s}KE/GL-/'`,l-/w y rG/Z.-I /tl/&1,444 14 ZIP 9 2 24' STATE LICENSE# I_ARR.'-/ Z�,, 6(3c' 13P EXP. DATE 7/3//04 FEDERAL I.D. # By signing the application form, the applicant/owner attests that the information provided herein is true and correct toa the best of their knowledge. Any material falsehood or any omission of a material fact made by the applicant/owner with respect to this application packet may result in this permit being null and void. I further agree to save, indemnify and hold harmless Jefferson County against all liabilities, judgments, court costs, reasonable attorney's fees and expenses which may in any way accrue against Jefferson County as a result of or in consequence of the granting of this permit. I further agree to provide access and right of entry to Jefferson County and it's employees, representatives or agents for the purpose of application review and any required later inspections. Access and right of entry to the applicant's property or structure shall be requested and shall occur during regular business hours. APPLICANT SIGNATURE �r 4/e-- f DATE 1 / L. / ,999,99944994944,999999'..94 499,79911P'9949949#6.49-49*97,1,99,-W 9,499,9949.9-94W..'444-99" . -499 ii� i � ' . 2'9,11 - ,y p� � O FCE EON' z ' / '' ? nth1- r y * ,B. SE :49.:9'9)a,%,:,';,f,,,....:9v::(,..-',?,';9':,9--;r,,,'9#e'k-.'o,,4,A.,.91 3,A,*-,-,:.:'.:.':, I TATE SURC ARG 4 5t3 - y e ' y CASH/GK# v % :TOT L 'r a H:\HOME\PLNCNTR\FORMS\DEM010/99 • • SPECIAL CONDITIONS FOR CASE#BLD03-00636: 1.) The application was reviewed by the Jefferson County Department of Community Development staff on (date)for the potential presence of Environmentally Sensitive Areas (ESAs) under the provisions of the Unified Development Code (UDC). After an initial Geographic Information Systems mapping review and an investigative site inspection, the following ESAs were confirmed to be present on the subject property: Conservancy Shoreline Designation, Fish &Wildlife Habitat(Eagle), Level 1 and 3 Landslide Hazard Area, Erosion Hazard, Susceptible and Special Aquifer Recharge Area Protection Area. 2.) The proposed manufactured home and detached garage are located approximately 500 feet from the top of the bank and more than 350 feet from the mapped landslide hazard area. Based on the location of the proposed development relative to the landslide hazard area, a geotechnical report is not required for this proposal. 3.) Washington State Department of Fish &Wildlife commented on the application November 18, 2003 and determined the proposal is not in conflict with eagle habitat as it is located greater than 800 feet from a nest and not within shoreline jurisdiction. 4.) Aquifer Recharge Areas in Jefferson County are characterized by porous geological formations that allow percolation of the surface water into the soils and the underlying zone of saturation. Aquifers are geologic formations that contain sufficient saturated permeable material to yield significant quantities of water to wells and springs. Aquifers serve as the source of drinking water within most of the rural portions of Jefferson County. 5.) Susceptible Aquifer Recharge Areas are those with geologic and hydrologic conditions that promote rapid infiltration of recharge waters to groundwater aquifers. 6.) Critical Aquifer Recharge Areas are defined as Seawater Intrusion Areas, and Special Aquifer Recharge Protection Areas and the following land uses located within Susceptible Aquifer Recharge Areas (1)All Industrial Land Uses (2)All Commercial Uses (3)All Rural Residential Land Uses requiring a Discretionary Use or Conditional Use Permit (4)All Rural Residential Land Uses with nonconforming uses that would otherwise require a Discretionary Use or Conditional Use Permit (5) Unsewered Planned Rural Residential Developments (6) Unsewered residential development with gross densities greater than one unit per acre. All of the above listed uses shall be subject to the applicable requirements and standards of the Jefferson County Unified Development Code. 7.) Buffers are areas that shall be maintained in their natural condition, however, minor pruning or alteration of vegetation may be permitted as long as the function and character of the buffer are not diminished. 8.) Among the native conifer species which may be used in buffers or for re-vegetation include, but are not limited to: Grand Fir(Aibes grandis), Sitka Spruce (Picea Sitchensis), Shore Pine (Pinus Contorta), Douglas Fir(Pseudotsuga Menziesii), Western Red Cedar (Thuja Plicata), and Western Hemlock (Tsuga Heterophylla). Among native tree species which may be used includes: Vine Maple (Acer Circinatum), Big-Leaf Maple (Acer Macrophyllum), Red Alder(Alnus Rubra), Pacific Madrone (Arbutus Menziesii), Quaking Aspen (Populus Tremula), Black Cottonwood (Populus Trichocarpa), Bitter Cherry(Prunus Emarginata), Oregon White Oak (Quercus Garryana), Cascara (Rhamnus Purshiana), Pacific Willow(Saliz Lasiandra), and Scouler's Willow(Saliz Scouleriana). Among the native shrub species which may be used are: Sevice-Berry(Amalanchier Alnifolia), Red Osier Dogwood (Cornus Stolonifera) Salal (Gaultheria Shallon), Ocean Spray(Holodiscus Discolor), Indian Plum (Oemlaria Cerasiformis), Pacific Ninebark (Physocarpus Capitus), Red Flowering Currant (Ribes Sanguineum), Wild Rose (Rosa Nutkana), Swamp Rose (Rosa Pisocarpa), Willows (Salix ssp.), Red Elderberry (Sambucus Racemosa), Snowberry(Symphoricarpos Albus), Evergreen Huckleberry (Vaccinium Ovatum), Red Huckleberry(Vaccinium Parvifolium). • • 9.) Marine shorelines and islands are susceptible to a condition that is known as seawater intrusion. Seawater intrusion is a condition in which the saltwater/freshwater interface in an aquifer moves inland so that wells drilled on upland areas cannot obtain freshwater suitable for public consumption without significant additional treatment and cost. Maintaining a stable balance in the saltwater/freshwater interface is primarily a function of the rate of aquifer recharge (primarily through rainfall)and the rate of groundwater withdrawals (primarily through wells). The Washington Department of Ecology is the agency with statutory authority to regulate groundwater withdrawal for individual wells in Jefferson County. New development, redevelopment, and land use activities on islands and in close proximity to marine shorelines in particular should be developed in such a manner to maximize aquifer recharge and maintain the saltwater/freshwater balance to the maximum extent possible by infiltrating stormwater runoff so that it recharges the aquifer. 10.) The parcel is located within a coastal SIPZ (seawater intrusion protection zone) according to the County GIS map. There are voluntary and mandatory measures identified in the Jefferson County Seawater Intrusion Policy(Resolution 44-22, effective September 23, 2002) that apply to well drilling proposals and building permit applications on existing lots of record. A Coastal SIPZ is defined as: all islands and area within one-quarter mile of marine shoreline, but no history of chloride concentration above 100 mg/L in groundwater sources within 1000 feet. 11.) A vegetative buffer of 30-feet shall be permanently maintained from the top or edge of the Landslide Hazard Area. All buffers shall be measured perpendicularly from the top of the Landslide Hazard Area. 12.) Landslide Hazard Areas and their associated buffers shall remain naturally vegetated. Should buffer disturbance occur during construction, the Unified Development Code (UDC)Administrator shall require replanting with native vegetation. No alterations shall be made to the Landslide Hazard Area or its associated buffer without prior authorization by the UDC Administrator. 13.) Prior to and during approved construction activities, the perimeter of the landslide hazard area buffer shall be marked with a temporary sign. The sign shall be placed in such a manner that it can be directly observed from the construction area. The sign shall contain the following statement: "Landslide Hazard Area and Buffer- Do not Remove or Alter Existing Vegetation." 14.) All construction activities shall not encroach upon the buffer. This includes the storage or preparation of materials. 15.) The applicant shall permanently separate the boundary of the Landslide Hazard Area Buffer from the remainder of the subject property through installing logs, trees, a hedge row, or any other prominent physical marking approved by the UDC Administrator. 16.) Critical Aquifer Recharge Areas may require special protection measures to mitigate water quality degradation. The submitted proposal does not require additional aquifer protection measures. However, during construction the project shall follow the Best Management Practices (BMPs) and facility design standards as identified and defined in the Stormwater Management Manual for the Puget Sound Basin. 17.) To help prevent seawater from intruding landward into underground aquifers, all new development activity on Marrowstone Island, Indian Island and within 1/4 mile of any marine shoreline shall be required to infiltrate all stormwater runoff onsite. 18.) MANDATORY MEASURES FOR COASTAL SIPZ: 1. For proof of potable water on a building permit application, applicant must utilize DOH-approved public water system if available. 2. If public water is unavailable, a qualifying alternative system may be used as proof of potable water or an individual well may be used as proof of potable water subject to the following requirement: a. Chloride concentration of a laboratory-certified well water sample submitted with building permit application. 3. If public water is unavailable, a qualifying alternative system may be used as proof of potable water. • • 19.) Residential developers and individual builders shall be required to preserve shoreline vegetation and reduce the associated risk of erosion during construction and any future activity which may impact the stability of the shoreline. 20.) The standard setback for residential structures, including common appurtenant structures such as garages and workshops, shall be thirty(30)feet or one (1)foot for each foot of bank height, whichever is greater. This setback shall be measured from the bank's edge when the bank's height exceeds 10 feet. When the bank's height is less than 10 feet, the setback shall be measured from the ordinary high water mark. The setback shall not exceed 100 feet. 21.) The applicant is proposing to create or add 4,477 square feet of impervious surface and 2,578 square feet of land disturbing activities. Sections 6.6 and 6.7 of the Jefferson County Unified Development Code requires that your proposal submit a stormwater plan meeting minimum requirements#1 through#5 of the Department of Ecology Stormwater Management Manual for Western Washington. 22.) A Stormwater Plan has been submitted and approved by the Department of Community Development. Once the subject permit has been issued the applicant shall fully implement the provisions of the submitted plan and contact the Jefferson County Department of Community Development to arrange a schedule to inspect the property for plan compliance. A Certificate of Occupancy will not be issued until the Department verifies plan compliance. No clearing for roadways or utilities shall occur on the project site until clearing necessary for the installation of temporary sedimentation and erosion control measures have been completed. 23.) Jefferson County determined that this proposal is categorically exempt from review under the State Environmental Policy Act(SEPA) pursuant to WAC 197-11-800(1)(b)(i). 24.) Outdoor residential storage shall be maintained in an orderly manner and shall create no fire, safety, health or sanitary hazard. 25.) Not more than two (2) unlicensed or inoperable vehicles shall be stored on any lot less than one-half acre unless totally screened from view of neighboring dwellings and rights-of-way. Such screening shall meet all applicable performance and development standards specific to the district in which the storage is kept, and shall be in keeping with the character of the area. Screening shall meet the requirements of Unified Development Code (UDC) Section 6. Outdoor storage of thirteen (13)or more unlicensed or inoperable vehicles is prohibited except in those districts where specified as an automobile wrecking yard or junk (or salvage)yard and allowed as a Permitted Use in Table 3-1 of the UDC, and such storage shall meet the requirements of UDC Section 4.10. In no case, shall any such unlicensed or inoperable vehiclesbe stored in an Environmentally Sensitive Area (ESA). 26.) Maximum lot coverage is not to exceed 10%. Lot coverage is defined as amount of impervious surface which includes roof tops, driveways, concrete, etc. 27.) The building height is not to exceed 35 feet. 28.) Minimum setback from the Northern parcel boundary and the ingress/egress easement is 20 feet. Minimum side and rear setbacks are 20 feet. Minimum shoreline setback is 100 feet from the top of the shoreline bank. 29.) A minimum of two (2)onsite parking spaces are required for the manufactured home. 30.) This parcel is a legal conforming parcel designated as Parks, Preserve and Recreation under the Jefferson County Comprehensive Plan Land Use Map effective August 28, 1998. 31.) Old Fort Townsend Rd is a county local access road. The road approach is existing, and an address of 1370 Old Fort Townsend has been assigned to the parcel. 32.) An evaluation of the existing septic system was conducted under SEP03-00243 and completed October 17, 2003. 33.) A septic permit(SEP01-00073)was approved October 1, 2001 for a Camp Ground Station with capacity of 3,078 gallons per day. A septic permit(SEP01-00074)was approved July 2, 2002 for a Day Use Station with capacity of 3,400 gallons per day. A shoreline exemption (SDP01-00033)was approved December 13, 2001 to repair and renovate the existing water, sewer and electrical systems located within shoreline jurisdiction. • 34.) Caretaker residences are identified as Conditional Administrative uses in UDC Table 3-1. This application proposes demolition of an existing residence and installation of a manufactured home in the same location. Per UDC Section 8.1.3.a, the Administrator has determined this is the replacement of an existing use to be reviewed as an allowed "Yes" use. 35.) Potable water is provided by Kala Point Water System. 36.) The site plan as submitted with the building application on October 1, 2003 has been reviewed for consistency under the UDC, and has been approved by Jefferson County Department of Community Development. Any modifications, changes, and/or additions to the stamped, approved site plan dated November 19, 2003 shall be resubmitted for review and approval by Jefferson County Department of Community Development. 37.) The caretaker residence shall be occupied only by a caretaker, and his/her immediate family, or guard employed on the premises. 38.) This approval is for a caretaker residence (manufactured home), a detached garage and demolition of a residence only. Any future permits on this site are subject to review for consistency with applicable codes and ordinances and does not preclude review and conditions which may be placed on future permits. I:\F_BLD_Permit_Propane.rpt 10/29/19 • - N N m,� 2649,45 (SE 1/4 21-30N-1W) �' (NE 1/4 21-30N— J N) N j�000 • IZD N CN XOOOO r (I --I m`iz r"NO \—I4, 'sW0 U1 yI 'D ZIs;c mz p oO ON W ~ (D O GnI �/ N —{Z N 1 o No ON O�� j / '< N �� r- r ��� JN P N O vo CT) z \ I m 4 G Fs) O � V w\v\ 1 z z I D rM gVii 1 15) f' 2 N PERMIT # BLD . o 0 o0 4 3 41- �; 6 .g JEFFERSON c •-q• COUNTy DCD w ' (SW 1/4 23-30N-1W) (NW 1/4 23-30N-1W) • n rya O \ .Z1 H N 2 � f it y n N N N 0 0 om 8 2 ; 2 Z 2 O. p p, p p p 0 • oV1� OVII DER PLAN Storm water Site Plan ST0R � Nov 5 2OO . in support of a r Rsor4 co""�Y p`" Building Permit lEFF� vista for the • -WA State Parks Residence Project at Old Fort Townsend;State Park Prepared for Jefferson: County, Washington Department of .Community. Development • September 2003 Prepared By: I 71-11-T---7ram , I _ CH2M HILL ` 777108th Avenue NE ' 1 1003 LI I 1 - Bellevue,WA 98009-2050 _��dITY OEVELC IP4T JEFFERSON COUNTY,WASHINGTON SECTION 1 Project Overview This Stormwater Site Plan presents information and analysis necessary to support the Jefferson County Stormwater Management Information and Permit Application for a new ranger residence located in Old Fort Townsend State Park. In accordance to the Jefferson County Stormwater Management Standards for a redevelopment project,this report includes all documentation to meet Minimum Requirements#1 through#5 as set forth in the Western Washington Stormwater Management Manual(Ecology,August 2001). 1.1 Project Description This project proposes to replace an existing ranger residence located just south of the main access road inside Old Fort Townsend State Park(Parcel Number 001223002). The State Park is located in Jefferson County,about five miles south of Port Townsend,and to the east of SR 20. The address of the Old Fort Townsend State Park is 200 Battery Way,Port Townsend,WA 98368 and it is located in Township 30N,Range 1W,and Section 22. Vicinity map is shown in Figure 1. The existing residence will be replaced by a manufactured home. Adjacent to the manufactured home,a new stick built garage and new 500-gallon propane tank will be installed. The existing garage on site will remain in place. Proposed construction items are shown in Figure 2,the Residence Site Plan and Figure 3, the Site Demolition Plan. Proposed new and replaced impervious areas are summarized in Table 1. Table 1 New and Replaced Impervious Areas Description Area(square feet) New Impervious 4,477 Replaced Impervious 2,335 Total Net New Impervious 2,142 SWSP.JEFFERSON000NTY.DOC WA STATE PARKS RESIDENCE PROJECT OLD FORT TOWNSEND STATE PARK STORMWATER SITE PLAN 0 JEFFERSON COUNTY,WASHINGTON 010 0 0 1.2 Existing Conditions • There are no concentrated stormwater conveyance facilities in the vicinity of this project. Runoff from the existing house and adjacent access road sheet flows down to the camp site • to the north east and discharges into Puget Sound(see Figure 4,Topography). • Average total precipitation between historic years 1948 to 2003 is 19.23 inches. Average OD maximum and minimum temperatures for the same years are 58.3°F and 43.8°F, respectively(Western Regional Climate Center,2003). Soils in the proximity of the proposed resident housing site is Clallam Series—CmC,a • gravelly,sandy loam with 0 to 15 percent slopes(USDA Soil Conservation Service,1975). • This soil is considered well-drained and has a slow to medium runoff rate. There is a slowly permeable cemented layer at a depth of 20 to 40 inches. Soils can be saturated for part of the-rainy season,with water moving laterally above this cement layer. Hazard of • water erosion is slight to moderate(see Figure 5,Soils). • The proposed site is not within 200 feet of wetlands. The National Wetland Inventory • shows pocket wetlands outside the boundaries of the state park(see Figure 6,Existing Wetlands). • FEMA Flood Insurance Rate Map for Jefferson County,Washington(Panel Number 530069 • 0160B)shows this area to be above both the 100-year and 500-year flood zone boundaries (see Figure 7,FEMA Floodplain Map). Old Fort Townsend State Park is located in an area • designated as Zone C,an area of minimal flooding. 0 • 1.3 Analysis of Site Limitations There are no apparent environmental limitations at this site to impede the design and • construction of the proposed new residence housing. Maintaining the existing natural • drainage pattern,drainage will continue to sheet flow to Puget Sound.There are no existing Ok erosion problems in the area. Other sensitive areas such as wetlands,streams;and steep slopes are not within the project site limits. • A A 0 A A A S S A S SWSPJEFFERSONCOUNTY.DOC 5 WA STATE PARKS RESIDENCE PROJECT OLD FORT TOWNSEND STATE PARK STORMWATER SITE PLAN JEFFERSON COUNTY,WASHINGTON SECTION 2 Preliminary Development Layout A residence site plan and demolition plan have been completed for the proposed resident housing project and are shown in Figure 3 and Figure 4. The project proposes to dear brush within a 30-foot buffer in back of and to the west of the existing home. A State Park Arborist will determine tree removal based on potential hazards to the home. Trees removed within the project limits will be stockpiled on site. The maximum slope on site will be 9.5%. The site layout takes advantage of the existing home footprint. The existing 25'x 75'home, associated sidewalks,and driveway will be demolished. In its place,a new 27'x 56' manufactured home,28'x 28'stick built garage,500-gallon propane tank,and associated sidewalks and driveway will be installed. Table 2 below summarizes the Jefferson County Stormwater Calculation Sheet. Table 2 Summary of Stormwater Calculation Sheet Impervious Area Description New Impervious Area Existing Impervious Area—To Be (square feet) Replaced (square feet) Structures(home and garage) 2,524 1,875 Driveway 1,433 391 Sidewalks 305 45 Patios 80 0 Propane Tank 95 0 Porch 40 24 Total 4,477 2,335 Total NET NEW Impervious 2,142 SWSP-JEFFERSONCOUNTY.DOC 10 WA STATE PARKS RESIDENCE PROJECT OW FORT TOWNSEND STATE PARK STORMWATER SITE PLAN S 110 JEFFERSON COUNTY,WASHINGTON • Op SECTION 3 Off-Site Analysis • A • An off-site analysis was not required since the project creates less than 5,000 square of net new impervious surface. The project adds 2,142 square feet of net new impervious surfaces and replaces 2,335 square feet of existing impervious surface. • • • A • • • • • S S A • • • • S S 0 • • • a a a a 110 SWSPJEFFERSONCOUNTY.DOC 11 WA STATE PARKS RESIDENCE PROJECT OLD FORT TOWNSEND STATE PARK STORMWATER SITE PLAN JEFFERSON COUNTY,WASHINGTON SECTION 4 Minimum Requirements In accordance to the stormwater management guidelines of Jefferson County,all new development and redevelopment must meet the standards and minimum requirements set by the Washington Department of Ecology Stormwater Management Manual for Western Washington(Ecology Manual). Since 35%of the site(legal parcel of Old Fort Townsend State Park)is not developed,the site is considered a new development and*vill follow the requirements as determined by the Ecology Manual's flow chart(Figure 2.2 in the Ecology Manual)for determining requirements for a new development. This flow chart is shown in Figure 8. The new residence home siting project at Old Fort Townsend State Park will create 2,142 square feet of new impervious area. The project will replace the existing home with a new manufactured home and stick built garage. The project will not convert 3/acres or more of native vegetative to lawn or landscaped areas. It will not convert 2.5 acres or more of native vegetation to pasture. The total net new and replaced impervious surface area is 4,477 square feet. Therefore,in accordance to the Ecology Manual,all new and replaced impervious surfaces will meet Minimum Requirements#1 through#5. A description of these requirements and an explanation of how this project will comply with such regulations is presented below: 4.1 Minimum Requirements #1 Preparation of a Stormwater Site Plan This report documents the Stormwater Site Plan and its required elements as documented in the Ecology Manual. 4.2 Minimum Requirements #2 Construction Stormwater Pollution Prevention (SWPP) The project will strictly follow the 12 elements of the construction stormwater pollution prevention as documented in the Ecology Manual. Section 6 of this report describes how the project will implement the Construction SWPP requirements. 4.3 Minimum Requirements #3 Source Control of Pollution Landscaping and Lawn/Vegetation Management—Pervious surfaces on-site will be hydro- seeded. Structure Painting—Painting will be completed with adherence to the pollutant control approach for BMPs for Painting/Finishing/Coating of Vehicles/Boats/Building/Equipment as SWSP-JEFFERSONCOUNTY.DOC 12 WA STATE PARKS RESIDENCE PROJECT OW FORT TOWNSEND STATE PARK STORMWATER SITE PLAN 110 JEFFERSON COUNTY,WASHINGTON POO required in the Ecology Manual including proper disposal and cleaning of paint and paint products. Gas Tank-A Spill Prevention and Control Plan is not required for the 500-gallon propane 014) tank since it is less than 660 gallons. The tank will be placed on an impervious concrete pad surface with a surrounding fence,a minimum of 10 feet from the new residence home and rib garage. 4.4 Minimum Requirements #4 Preservation of Natural Drainage Systems and Outfalls Old Fort Townsend State Park lies adjacent to Puget Sound so no drainage easements will be required for downstream discharge. Runoff from the existing house and adjacent access road currently sheet flows down to the camp site to the northeast and discharges into Puget Sound. This natural drainage from the project site will be maintained. Since the net new impervious surface area is 2,142 square feet,the increase in runoff discharge is not expected to cause a significant adverse impact to Puget Sound. A single outfall is not proposed as rOD part of this project. sal 4.5 Minimum Requirements #5 On-Site Stormwater Management dlb Stormwater will be retained and dispersed on-site to the maximum extent possible. Roof 01. drain runoff will be directed to a drain rock splash pad located about 50-feet north of the # proposed garage and dispersed away from the home. Runoff will maintain existing sheet # flow dispersion. I. I. I a . a a a I. a a a II a SWSPJEFFERSONCOUNTY.DOC 14 WA STATE PARKS RESIDENCE PROJECT OW FORT TOWNSEND STATE PARK STORMWATER SITE PLAN a JEFFERSON COUNTY,WASHINGTON SECTION 5 Permanent Stormwater Control Plan Since the project proposes to add less than 5000 square feet of net new impervious area, water quality(Minimum Requirement#6)and flow control(Minimum Requirement#7) systems are not discussed. • SWSPJEFFERSONCOUNTY.DOC 15 WA STATE PARKS RESIDENCE PROJECT OLD FORT TOWNSEND STATE PARK STORMWATER SITE PLAN w 0 JEFFERSON COUNTY,WASHINGTON SECTION 6 _ `"' f. Construction Stormwater PollutionPrevention ,.�► Preventi Plan (SWPPP) 0046 foes Fob The 12 elements of the construction stormwater pollution prevention plan are adhered to as documented below: Element 1:Mark Clearing Limit 1041 Existing vegetation(tree),bushes,shrubs)will be preserved when its removal is not 00. necessary for the project. Clearing limits have been marked to include the area from the existing access road to 30 feet beyond the footprint of the existing home(see Figures 2 and 3).Temporary silt fence will delineate the majority of the Bearing limits. 000 Element 2:Establish Construction Access Construction access from SR 20 will be on the main camp road to the proposed residence home site. Element 3:Control Flow Rates Pah Since the project creates less than 5,000 square feet of net new impervious surface and the natural drainage system will not be altered,a downstream analysis is not necessary. 0101 006 Detention is not required for this site since the project is not required to meet Minimum Requirement#7. Due to the small area of converted surfaces,peak flows and velocities are not expected to significantly increase to cause erosion downstream. Existing soils at the site 1016 are not erosional. Proposed slopes are minimal(10.5 : 1 maximum slope). Element 4:Install Sediment Controls Natural vegetation shall be retained in an undisturbed state to the maximum extent practical during and after construction. Silt fences will be placed at the project clearing limits to prevent disturbed sediment from leaving the project site. The Contractor will be 110 required to install the temporary silt fences before any clearing and/or grubbing occurs. Element 5:Stabilize Soils 10 Maximum slope at the project site is 9.5%. The existing soils are classified as having slight to moderate hazard of erosion(Clallam Series—CmC) and all disturbed permeable surfaces will be hydro-seeded for permanent grass vegetation. oftli For construction from October 1 through April 30,no soils will remain exposed and unworked for more than 2 days. For construction from May 1 to September 30,no soils will remain exposed and unworked for more than 7 days. This condition will apply to all soils 414 on site,whether at final grade or not. SWSP,IEFFERSONCOUNTY.DOC 16 0111 WA STATE PARKS RESIDENCE PROJECT OLD FORT TOWNSEND STATE PARK 04 STORMWATER SITE PLAN JEFFERSON COUNTY,WASHINGTON Element 6:Protect Slopes - Cut and fill slopes are to be constructed in a manner that will minimize erosion. Maximum slope at the project site is 9.5%and no significant erosion hazards are expected from the project. _ For construction from October 1 through April 30,no soils will remain exposed and unworked for more than 2 days. For construction from May 1 to September 30,no soils will remain exposed and unworked for more than 7 days. This condition will apply to all soils on site,whether at final grade or not. Finished slopes will be seeded,fertilized,and mulched or covered with erosion control blanket during the next available seeding period. Temporary cover will be placed over completed slopes until the slope is seeded. Element 7:Protect Drain Inlets The project does not propose to provide dosed conduit drainage with drain inlets. Wherever construction vehicle access routes intersect paved roads,provisions will be made to minimize the transport of sediment and mud unto the paved roads. If sediment is transported onto a paved road,then the road will be deaned thoroughly at the end of each day. Sediment will be removed by shoveling or sweeping. Washing the street with water will not be allowed. The removed sediment will be transported to a controlled sediment disposal area. Element 8:Stabilize Channels and Outlets No conveyance channels or concentrated outlets for stormwater runoff are proposed for the project. Element 9:Control Pollutants Pollutants on-site will be handled and disposed of in a manner that will not cause contamination and harm to stormwater. Any maintenance and repair of heavy equipment and vehicles involving oil changes,hydraulic system drain down,solvent and de-greasing cleaning operations,fuel tank drain down and removal,and other activities that may result in contamination to the ground or stormwater runoff will use spill prevention measures. Element 10:Control De-Watering If dewatering is necessary,dewatering devices will discharge into a sediment trap. No de- watering is expected for this project. Element 11:Maintain BMPs All temporary and permanent erosion and sediment control BMPs will be maintained and repaired as needed to assure they continue to perform in accordance to their intended use. Silt fences will be inspected weekly or after a runoff-producing storm event during construction in the dry season and daily during construction in the wet season. Weekly inspections will occur at the end of the workweek and any needed repairs will be completed before the job is shut down for the weekend. SWSPJEFFERSONCOUNTY.DOC 17 WA STATE PARKS RESIDENCE PROJECT OLD FORT TOWNSEND STATE PARK STORMWATER SITE PLAN • JEFFERSON COUNTY,WASHINGTON • All temporary erosion sediment control BMPs will be removed within 30 days after final site stabilization is achieved or after the temporary BMP is no longer needed. Each of the temporary BMPs will be removed after uphill areas are stabilized. The area previously occupied by the BMP and any disturbed adjacent area will then be leaned,restored,and permanently stabilized. Trapped sediment will be removed or stabilized on site. 1 1 Element 12:Manage The Project The project will be managed to control erosion and prevent sediment and other.pollutants from leaving the site during the construction phase of the project. A certified professional in erosion and sediment control is not required for this medium sized project in Jefferson County(Jefferson County Community Development,Sept 2003). SWSP-JEFFERSONCOUNTY.DOC 18 WA STATE PARKS RESIDENCE PROJECT OW FORT TOWNSEND STATE PARK STORMWATER SITE PLAN JEFFERSON COUNTY,WASHINGTON • SECTION 7 Special Reports and Studies No other special reports and studies were conducted to prepare this Stormwater Site Plan. SECTION 8 Other Reports No additional permits are required whose conditions will affect the drainage plan for the new residence housing project at Old Fort Townsend State Park. SECTION 9 Operations and Maintenance Manual No flow control or water quality facilities are needed,so an operations and maintenance manual is not required. SECTION 10 Bond Quantities Worksheet The primary source of funding is the 2001-2002 governor's economic stimulus monies,so a bond is not required. SWSPJEFFERSONCOUNTY.DOC 19 WA STATE PARKS RESIDENCE PROJECT OW FORT TOWNSEND STATE PARK STORMWATER SITE PLAN 1 - �\ DD DD P V p. yy., p W N --` Z n p~ N og>.mrlozmo cm'I om-<z —mo O mOZD ° -aim CNrr9 DO =Z Zcn'm Z �— �,ZVAP. 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