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HomeMy WebLinkAboutBLD2009-00055 •UILDING PERMIT APPLICAS N MLA09-00037 Review Type: I Jefferson County Department of Community Development 621 Sheridan Street Port Townsend, WA 98368 PERMIT#: BLD09-00055 Received Date: 2/18/2009 SITE ADDRESS: 1,b S BEACH DR PORT LUDLOW, 98365 OWNER: PAULA I FRIAL TRUSTEE PHONE: 206-325-6095 OSCAR A FRIAL TRUSTEE 2312 DELMAR DR E SEATTLE WA 98102-4026 TRAIL'S END 1ST ADD SUBDIVISION: Block: 7 Lot: 9N PARCEL NUMBER: 950100710 Section: 16 Township: 27 N Range: 01 E CONTRACTOR: TBD PHONE: 205-807-2541 REPRESENTATIVE: HENRY M SOUZA PHONE: (360)379-8338 DESIGNS BY SOUZA INC (360) 379-9136 164 SWANSON PROJECT DESCRIPTIOI NEW DETACHED GARAGE - UNHTD, NO PLMB TYPE OF WORK GAR SQUARE FOOTAGE: TYPE OF IMP NEW MAIN: VALUATION 23,760.00 ADD'L: HEAT TYPE: UH CODE EDITION: 2006 HEAT BASE: HEAT TYPE: OCCUPANCY: UNHEATED: #OF STORIES: OCCUPANCY: OTHER: CONST TYPE: GARAGE: 528 SHORELINE: CONST TYPE: DECK: SETBACK: BANK HEIGHT: SEWAGE DISPOSAL: CMY WATER SYSTEM: BEDROOMS: BATHROOMS: Exist: 0 Exist: 0 Prop: 0 Prop: 0 Total: 0 Total: 0 Routing Date: Type Amount Paid By: Date: Receipt: /\ / Permit $377.25 LYK 02/18/09 105426 j� Plan Check $245.21 LYK 02/18/09 105426 JUL ?2L2 State Building Code $4.50 LYK 02/18/09 105426 Total: $626.96 Jefferson County Plannin,t &Building Cepa im ent CERTIFICATE OF OCCUPANCY Jefferson County Department of Community Development 621 Sheridan Street Port Townsend, WA 98368 (360)379-4450 FAX (360)379-4451 Carl Smith, Director/Building Official PERMIT#: BLD09-00055 APPLICANT: PAULA I FRIAL TRUSTEE PHONE: 206-325-6095 OSCAR A FRIAL TRUSTEE 2312 DELMAR DR E SEATTLE WA 98102-4026 SITE ADDRESS: 70 S BEACH DR Issue Date: 07/22/2009 PORT LUDLOW, 98365 Final Date: 6/20/2014 SUBDIVISION: TRAIL'S END 1ST ADD Block: 7 Lot: 9N PARCEL NUMBER: 950100710 Section: 16 Township: 27 N Range: 01 E PROJECT DESCRIPTION: NEW DETACHED GARAGE - UNHTD, NO PLMB and shoreline exemption permit (SDP09-00015) THE PROJECT LISTED ABOVE COMPLIES WITH THE REQUIREMENT OF THE BUILDING CODE 2006 EDITION. OCCUPANCY GROUP: R-1 TYPE OF CONSTRUCTION: SPRINKLER SYSTEM yes & THE PROJECT PASSED ITS FINAL INSPECTION AND RECEIVED FINAL SIGN OFF ON 6/20/2014 \\tidemark\data\forms\F_BLD_Occupancy.rpt 6/25/2014 Jefferson County Building F; sion Permit Nu - BLD09-00055 Applicant: FRIAL TRUSTEE BUILDING PERMIT INSPECTION APPROVALS applicable Code: 2006 International Building Codes To schedule inspections, call (360)379-4455 no later than 7:00 AM the day of the inspection. Requests received after 7:00 AM will not be scheduled for that day's inspections. ELECTRICAL PERMITS are issued by the Washington State Department of Labor& Industries. The electrical permit must be signed off by the State Inspector prior to the County's Framing Inspection Inspection Item Date Approval Signature Notes Setbacks V,tN` • Minimum setback from South Beach Drive right-of-way shall be 20 feet. Minimum side and rear yard setbacks shall be 5 feet. Minimum yt 4., shoreline setback shall be 30 feet from Ordinary High Water Mark ` (OHWM). Erosion Control kZ� rOc l 07 SEE CONDITION 1: ENGINEERING Post Holes IJ Foundation Footing Footing Drains Foundation Stem Wall Underground Plumbing 1J Straps(hold downs) (.��- ,to Ext. Shear Wall Nailing `v `�^Y Rough-in Plumbing itY4 �C W Framing Q 2%5-10 Wallboard Nailing Drywell/Alt Drainage SEE CONDITION 1;ENGINEERING Address Posted Ato Via 2-2:3 _( effi 1n -ort & tA Cp: 3- — 10 f 7 Cond 4 3 `�-tor o FINAL INSPECTION z// f FINAL INSPECTION MUST BE APPROVED PRIOR TO BUILDING BEING OCCUPIED THIS PERMIT IS VALID FOR ONE YEAR • • CONDITIONS for Building Permit# :BLD09-00055 1.) PRIOR TO FINAL BUILDING OCCUPANCY, PROPONENT SHALL SUBMIT A WRITTEN LETTER FROM MICHAEL ANDERSON STATING THAT THE STORMWATER FACILITY HAS BEEN CONSTRUCTED IN ACCORDANCE WITH THE REQUIREMENTS OF THE "STORMWATER REPORT" RECEIVED ON FEBRUARY 18, 2009 AS SIGNED BY MICHAEL J. ANDERSON, PE& PLS. 2.) Prior to beginning any ground disturbing activities, the applciant shall stake the footprint of the proposed structures and install orange barrier fencing along the 30-foot shoreline setback. 3.) THE PROJECT PROPONENT SHALL CONTACT THE JEFFERSON COUNTY DEVELOPMENT REVIEW DIVISION BIOLOGIST(379-4450)AT LEAST 72 HOURS BEFORE BEGINNING ANY GROUND DISTURBING ACTIVITIES TO ARRANGE AN ON-SITE MEETING WITH THE CONSTRUCTION LEAD AND THE COUNTY BIOLOGIST. PRIOR TO INITIATING ANY GROUND DISTURBING ACTIVITIES, THE COUNTY BIOLOGIST SHALL MEET WITH THE CONSTRUCTION LEAD TO REVIEW THE LOCATION OF THE ORANGE BARRIER FENCING AND THE SILT FENCING (OR HAY BALES) RELATIVE TO THE STAKED BUILDING FOOTPRINTS. 4.) Water line must be a minimum of 10'from any portion of the septic tanks and sewer lines. 5.) 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. 6.) The property owner shall comply with Water Conservation Measures (per list maintained by the UDC Administrator). 7.) 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. 8.) An Engineered Storwmater 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. 9.) Outdoor residential storage shall be maintained in an orderly manner and shall create no fire, safety, health or sanitary hazard. 10.) Not more than 2 unlicensed vehicles shall be stored on any lot 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 Chapter 18.30 JCC. Outdoor storage of 3 or more junk motor 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 or Chapter 18.18 JCC, and such storage shall meet the requirements of JCC 18.20.100, Automobile wrecking yards and junk (or salvage)yards. In no case, shall any such junk motor vehicles be stored in a critical area. 11.) Maximum lot coverage is not to Oed 25%. Lot coverage is defined as amc of impervious surface which includes roof tops, driveways, concrete, etc. 12.) The building height is not to exceed 35 feet. 13.) Minimum setback from South Beach Drive right-of-way shall be 20 feet. Minimum side and rear yard setbacks shall be 5 feet. Minimum shoreline setback shall be 30 feet from Ordinary High Water Mark (OHWM). 14.) Exterior lighting for residential uses shall not exceed twenty feet(20') in height from the finished grade, excepting when such lighting is an integral part of a building or structure. Ground level lighting is encouraged. 15.) Lighting fixtures shall be designed and hooded to prevent the light source from being directly visible from outside the boundaries of the property. The intensity or brightness of all lighting, during construction and after project completion shall not adversely affect the use of surrounding properties or adjoining rights-of-way. 16.) 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. 17.) Approval of this development proposal does not ensure future approval of other appurtenant structures. • I _ -___ obk. JEFFERSON COUNTY :t j �% 1_. �� k4or 4 ,..., DEPARTMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street• Port Townsend •Washington 98368 ° 360/379-4450 • 360/379-4451 Fax 00 ',{ www.co.jefferson.wa.us/commdevelopment .' i 1� , •of J Master Permit Application MLA: �_ � 0:,,, 'Y , Project Description(include separate sheets as necessary): Construct Wood Framed Structure Attached Garage Tax Parcel 950 100 711 Property 11188.69 �., Number. Size: (acres�square feet)J \— Site Address and/or Directions to Property: 80 South Beach Drive, Port Ludlow, WA 98365 i Property-Owner(s)of Record: Paula Frial Telephone:206.226.4049 Fax: email: pfrial @msn.com Mailing Address: 2312 Delmar Drive east,Seattle,WA 981024026. Applicant/Agent(if different from owner): Henry M.Souza(DBA)Designs by Souza,Inc. Telephone: 360.379.8338 Fax: email: henry @designsbysouza.com Mailing Address: 164 Swanson Ave,Port Townsend,WA 98368 What kind of Permit?(Check each box that applies ❑Building ❑Variance(Minor,Major or Reasonable Economic Use) ❑ Demolition Permit ❑Conditional Use[C(a),C(d),or C]** ❑Single Family la Garage Attached/Detached ❑Discretionary"D"or Unnamed Use Classification ❑ Manufactured Home ❑ Modular ❑Special Use(Essential Public Facilities)** ❑ Commercial* ❑•Boundary Line Adjustment ❑ Change of Use ❑Short Plat** ❑ Address El Road Approach ❑Binding Site Plan** ❑ Home Business ❑Cottagelndustry ❑Long Plat** ❑Propane ❑Planned Rural Residential Development(PRRD)/Amendments** ❑Sign ❑Plat Vacation/Alteration** ❑Allowed"Yes"Use Consistency Analysis ❑Shoreline Master Program Exemption/Permit Revisions** ❑Stormwater Management ❑Shoreline Management Substantial Development** ❑Site Plan Approval Advance Determination(SPAAD)* ❑Shoreline Management Variance ❑Temporary Use ❑Comprehensive Plan/UDC/Land Use District Map Amendment ❑Wireless Telecommunication* ❑Jefferson County Shoreline Master Program Amendment ❑ Forest Practices Act/Release of Six-Year Moratorium ❑Tree Vegetaion Request *May require a Pre—Application Conference **Requires a Pre-Application Conference Please identify any other local,state or federal permits required for this proposal, if known: DESIGNATION OF AGENT I hereby designate Henry M.Souza to act as my agent in matters relating to this application for permit(s). OWNER SIGNATURE 4 /,vl Date: (IF 1 09 By signing this application form,the owner/agent attests that the information provided herein,and in any attachments,is true and correct to the best of his,her or it's knowledge. Any material falsehood or any omission of a material fact made by the owner/agent 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 its employees,representatives or agents for the sole purpose of application review and any required later inspections. Staff's access and right of entry will be assumed unless the applicant informs the County in writing at the time of the application . at he or she wants prior notice. ,. Signature: c' / ♦ • Date: ( O i 0 9 ltl 4 The action or actions Applicant will undertake as a result of the issuance of this permit may negatively impact upon one or more threatened or endangered species and could lead to a potential"take"of an endangered species as those terms are defined in the federal law known as the "Endangered Species Act"or"ESA."Jefferson County makes no assurances to the applicant that the actions that will be undertaken because this permit has been issued will not violate the ESA. Any individual,group or agency can file a lawsuit on behalf of an endangered species regarding your action(s)even if you are in compliance with the Jefferson County development code.The Applicant acknowledges that he,she or it holds individual and non-transferable responsibility for ering to and complying with the ESA. The Applicant has read this disciai �r an sig and dates it below. Signature: 0 _ `�,.------ Date: d- ZS Ci C:\Documents and Settings\caral\Local Settings\Temporary Internet Files\OLK86\Master Permit Application 12-19-2006.doc BUILDER STATEMENT .i.h: , : : ' - - - ' ' • - it" \ 1-- ' The signer of this statement does hereby certify that they are the Owners of the parcel referenced herein,that they are not licensed contracts artid th at they will be assuming the responsibility of the General Contractor for the proposed project. Signature: Date: GENERAL CONTRACTOR OR MANUFACTURED HOME INSTALLER: PHONE: FAX: Woodside Construction,Inc. ( 360)340-2233 ( ) MAILING ADDRESS: P.O.Box 1523,Kingston,WA 98346 EMAIL: P.O.Box 1523,Kingston,WA 98346 CONTRACTOR'S LICENSE WAINS NUMBER: BAREFD947MK NUMBER ARCHITECT/ENGINEER: Phil King Designs PHONE (425 )745-9233 FAx:( ) MAILING ADDRESS: 1527 150th St.S.W.,Lynnwood,WA EMAIL Project Type: Frame Type: Bathrooms: Shoreline: Type of Sewage Disposal: New ® Wood Existing: 0 ❑ Sewer ❑ Addition ❑ Steel Proposed: 0 Bank 0 Community System ❑ Alteration/Remodel ❑ Concrete Totai: 0 Height: 0 Individual System ❑ Repair ❑ Masonry SEP Permit# ❑ Demolition ❑ Other: Bedrooms: 0 Water Supply: ,- Existing: Setback: ❑ Private well ❑ Two Party Type of Heat: Proposed: �— 30, e' Public Total: �_ Name of System: Bridgehaven If this is a Commercial Proiect you must answer the following: Number of Parking Spaces: Current: Proposed: Number of ADA Parking Spaces: Number of occupants(includes owners,tenants,employees,etc) Current Proposed IBC Occupancy: IBC Type of construction: Will you have Food Service? Yes / No If this is a Propane Tank and/or Appliance Installation permit.mark all items below that apply: ❑Underground Tank 0 Above ground Tank Size of Propane Tank: ❑Heat Stove ❑Cook Stove ❑Wo.odstove ❑ Fireplace Insert 0 Hot Water Tank 0 Pellet Stove ❑Other ' Is this appliance being installed in a Manufactured/Mobile Home? Yes / NE When applying for a permit to install a propane tank you must also submit a site plan showing all of the buildings,all property lines,tank location and size,distances from the propane tank to all property lines,buildings and septic system components, including the reserve area. Square Footage Current Proposed For L# Use-Only,y `� - y x Main Floor Heated . EH Bid App Review: 2na Floor Heated Consistency Review {6Sl Other Heated _, , Base fee: 2.S— Mezzanine �-r , Additional Section: Heated Basement 4 Plan Check fee: _ z 41572 Unheated Basement ' State Surcharge fee: All-W Other Unheated Pot Water Review fee: Garage/Carport f' SUBTOTAL 528 �� � } Decks 911/Rd Approach fee: j/ A/ Other s TOTAL: $/() a„. 9& Receipt Number: IU y2 6 Cash/Check Number: ! }z9 ESTIMATED COST(REQCIIRED) Date: _ _ .Fair market value of all labor and material foundation to finish (� U Initials: 17 $23, 760 . 00 C:\Documents and Settings\car cal Settings\Temporary Internet Files\OLK86\Master Pemut Application 12-19-2006.doc V, !_ _ _ _ _ _ _ _ ,t I . -,,, k 1 t___.._.;._.cs_p__, j__ _ _ ____[ 1 iT1.� iff1 Ios 1 , 1 li -mot . :4' I I cp; , - 1.1 ,:{ I Ct:I. F:- 115 '4 tV7.,_.co..;„_______3-- ,9j _.,. _... � CCC I G r Ian! , I -t R I o� j _z_ i5, ,. 1 i() I �+' .�� I.. J I t �k •• I 4 --.- -\ Tom-/gist, , J 1 , 1 t _ _ 1 I s 1 Cg 24.1k, 1%. 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STORMWATER SITE PLAN SUBMITTAL TEMPLATE MLA# O 1-t5l PROJECT/APPLICANT NAME: Frial Garage t. . .,_ • 1, !i Please answer all of the following questions to the best of your ability. Where the questibn calls for clepi 1bn a site map, the applicant may choose to either incorporate the elements into the general plot plan for the Master Land Use Application or to submit a separate stormwater site plan map. Project Overview f.''` ls rt 1 ,a 1. Describe the proposed developed conditions of the site. Indicate position and relative size of proposed improvements on the site map. Construction of garage 675 sq/ft. and 1213 sq/ft of driveway Existing Conditions Summary 2. Describe the existing topography. Indicate contours on the site map. The lot is level and has no vegetation or trees that have to be cleared. 3. Describe the existing vegetation. Indicate native vegetation areas on the site map. A single wetland dominated by saltgrass, pickleweed and cattail with a few shrubs and trees growing along the west side of the wetland. 4. Describe the existing soils. Indicate soil type on the site map. The on-site soL.ls are mapped as Lu Lummi Silt Loam on the west half and rn CnaRt-al RParhPR nn t-hP Pact- half 5. Describe the existing site hydrology(i.e., drainage; behavior of water on the site—above, below, and on the ground). Indicate existing stormwater drainage to and from the site on the site map. Depict separate drainage basins on the site map, if applicable,and indicate acreage of each. Lot 9 South, Lot 10 are flat along the perimeter at top of bank. ThPrP is no standing water nn TO 9 nr Lnt 10 exreptthP waterway See attached site plan. 6. Describe any excess levels of noise generated by the proposed use or activity: APPROVED Only normal noise occurring during construction. STORMWATER PLAN — JUL 2 2 2009 iik Stormwate B `i k_ ...■ �. "� JEFFERSO l t:!' s stormwater site plan template.doc—rev.10/12/2003 Require , DEPT.OF ,® SIGNATUR=, I EI'1 r, � 'C'` • 7. Describe significant geographic features and critical areas (i.e., environmentally sensitive areas such as wetlands, streams, steep slopes,etc.)on the site. Indicate location on the site map. A single wetland was identified and delineated on this property. Wetland A is an estuarine wetland that lies on the north, south and west sides of these properties. It is connected to Hood Canal via the small tidal channel inlet to the north under North Beach Drive. 8. Describe the general vicinity of the site, including adjacent land uses and structures, utilities, roads,and sensitive/critical areas (streams,wetlands, lakes,steep slopes,etc.).The prolect site consists of 5 separate lots. Lot 8 is the northernmost lot & a single residence(east end) . Lot 9 north is undeveloped with the exception of a small shed on the NW corner.Lot 9 S has a larger shed near the center of the S line & is shared with Lot 10 . Lot 10 undeveloped and Lot 11 is almost entirely estuary & undeveloped. Permanent Stormwater Control Plan This portion of the Stormwater Site Plan consists of the selection and installation of the appropriate stormwater control BMPs and facilities to remain in place after construction of the project is completed. "Medium" size projects are required to have the totals calculated of all impervious surfaces, pollution-generating impervious surfaces, and pollution-generating pervious surfaces to verify that the thresholds for treatment facilities and flow control facilities are not exceeded. 9. Describe the developed site hydrology, as proposed. Indicate whether stormwater will be fully dispersed (i.e., per BMP T5.30 in the Manual)or, if not,what types of stormwater flow control will be utilized for the site or specific threshold discharge areas within the site. Locate these facilities on the site plan and differentiate proposed facilities from existing facilities. All stormwater will be diverted into rain garden as per engineer stormwater plan. 10. If the project requires the use of stormwater treatment facilities, describe the types of stormwater treatment facilities proposed for use on the site. Locate these facilities on the site plan and differentiate proposed facilities from existing facilities. [This is normally for"large"projects or projects that involve the potential for dispersion of contaminants.] Treatment of stormwater will be done bioswale and rain garden. See engineer stormwater plan. '' 11. Describe the performance goals and standards applicable to the project. , The builder intends to impact the site as little as possible arldisit is level with no vegetation removal . 12. Describe the flow control system. The builder does not intend on affecting any existing flows, the site is dry and level . stormwater site plan template.doc—rev.10/12/2003 6 • • 13. Describe the water quality system. The water quality system will be a bioswale, see attached engineer stormwater plan. 14. Describe the conveyance system analysis and design. See engineer stormwater plan. 15. Describe the source of fill material,physical characteristics of fill material, and deposition of excess material. We do not need any fill material, site is level and natural . 16. Proposed methods of placement and compaction consistent with the applicable standards on Appendix Chapter 33 of the Uniform Building Code. Any compaction done will comply to IRC 2006 minimum requirements, i.e. garage, driveways and slabs. 17. Describe the proposed surfacing material. Gravel driveway. 18. Describe methods for restoration of the site. Maintain the buffer zone. 19. An Operation and Maintenance Manual is required for each flow control and treatment facility. [This is normally required for "large"projects only and only those for which facilities are required to control flow or treat runoff.] If included, list the Manuals here. N/A 20. List here and include any special reports or studies conducted to prepare the Stormwater Site Plan. The enclosed "Wetland Analysis Report was referenced for the stormwater site plan. 21. List other necessary permits and approvals as required by other regulatory agencies. If those permits or approvals include conditions that affect the drainage plan or contain more restrictive drainage-related requirements,describe those conditions or restrictions here. .. Shoreline permit - there are no condition or restrictionsa; stormwater site plan template.doc—rev.10/12/2003 • CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN(SWPPP) The Construction SWPPP addresses sediment and erosion control during construction. The BMPs indicated by the applicant in the template that follows must be installed on the ground during all construction phases of the project. The proponent is responsible for preventing sediment and erosion impacts to environmentally sensitive areas and off-site areas. Consult the Construction Stormwater Pollution Prevention (SWPP) Best Management Practices (BMPs) Packet for guidance, particularly with rural residential development. SECTION I—CONSTRUCTION SWPPP NARRATIVE 1. Construction Stormwater Pollution Plan Elements. Describe how each of the Construction SWPPP elements has been or will be addressed. Identify the type and location of BMPs used to satisfy the required element. If an element is not applicable to the proposal,justify in writing. Descriptions of the 12 Elements are found at section 2.5.2 of the Manual(beginning on page 2-15). 12 Required Elements—Construction SWPPP 1. Mark Clearing Limits. The site plan has the clearing limits. 2. Establish Construction Access. The site plan has the construction access 3. Control Flow Rates. N/A 4. Install Sediment Controls. A silt fence will be installed. 5. Stabilize Soils. N/A 6. Protect Slopes. The site is level . 7. Protect Drain Inlets. N/A stonnwater site plan template.doc—rev.10/12/2003 • • 12 Required Elements—Construction SWPPP(continued) 8. Stabilize Channels and Outlets. N/A 9. Control Pollutants. The use of the bioswale. 10. Control De-Watering(the act of pumping groundwater or stormwater away from an active construction site). N/A 11. Maintain Best Management Practices(BMPs). See BMP attached. 12. Manage the Project. The general contractor will be at lob site at all times. 2. Adjacent Areas. a. Description of the adjacent areas that may be affected by site disturbance (e.g., streams, lakes, wetlands, residential areas, roads). Waterway (see attached site plan) and will be protected by a silt fence and a 30 ' setback. b. Description of the downstream drainage path leading from the site to the receiving body of water(minimum distance of 400 yards). Purified downstream drainage will be dissipated through the 30 ' setback. 3. Environmentally Sensitive Areas. a. Description of environmentally sensitive areas that are on or adjacent to the site. To the east is Hood Canal, the west is waterway (estuarine wetland category 2) . stonnwater site plan template.doc—rev.10/12/2003 • • b. Description of special requirements for working in or near environmentally sensitive areas. No special requirements needed other than silt fence, see engineer stormwater plan. 4. Erosion Problem Areas. Description of potential erosion problems on site in the context of the characteristics of the on-site soils(e.g.,erodibility,settleability,permeability,depth,texture,soil structure). N/A 5. Construction Phasing. a. Construction sequence Site plan, foundation, framing, roofing, interior finishing & landscaping. b. Construction phasing(if proposed) 6. Construction Schedule. Wet season is October 1 through April 30(page 2-21 of the Manual). Provide a proposed construction schedule. Site prep/foundation (July 09) Framing & roofing (Aug 09) Elec & Plumbing (Sep 09) Landscaping (Oct 09) II. Wet Season Construction Activities. a. Proposed wet season construction activities. None b. Proposed wet season construction activities for environmentally sensitive areas. None 7. Financial/Ownership Responsibilities. a. Identify the property owner responsible for the initiation of bonds and/or other financial securities. Paula Frial b. Describe bonds and/or other evidence of financial responsibility for liability associated with erosion and sedimentation impacts. Personal responsibility 8. Engineering Calculations. Provide Design Calculations on a separate sheet for the following, if applicable. a. Sediment Ponds/Traps. b. Diversions. c. Waterways. d. Runoff/Storrnwater Detention Calculations stormwater site plan template.doc—rev.10/12/2003 10 • • Stormwater Site Plan Changes If the designer wishes to make changes or revisions to the originally approved Stormwater Site Plan, the proposed revisions shall be submitted to DCD prior to construction. The submittal shall include substitute pages that include all proposed changes, revised drawings showing any structural changes,and any other supporting information that explains and supports the reason for the change. Final Corrected Plan Submittal If the project included construction of conveyance systems, treatment facilities,flow control facilities, or structural source control BMPs (not standard on-site stormwater management BMPs),the applicant shall submit a final corrected plan ("as-builts")when the project is completed. These should be engineering drawings (stamped by a licensed civil engineer) that accurately represent the project as constructed. APPLICANT SIGNATURE By signing the Construction SWPPP worksheet, I as the applicant/owner attest that the information provided herein is true and correct to the best of my knowledge. I also certify that this application is being made with the full knowledge and consent of all owners of the affected property.1.4---- (Si 01 (LANDOW 4 '.AUTHORIZED REP ENTATIVE SIGNATURE) (DAT THIS SPACE MAY BE USED FOR ADDITIONAL NOTES, IF NEEDED: 12 stormwater site plan template.doc—rev.10/12/2003 - •ID u t. STORMWATER REPORT FRIAL RESIDENCE LOTS 7-11, BLOCK 7, TRAILS END ADDITION 60 SOUTH BEACH DRIVE PORT LUDLOW, WA 98365 FEB 18 2009 J. kV aE wASO�� Z7//` °- EXP. DATE: 05 / 05 / 10 Prepared by APPROVED Michael J. Anderson STORMWATER PLAN PE&PLS No. 27665 330 Cleveland Street JUL 2 2 2009 Port Townsend, WA 908368 StormWeter BM"* ` JEFFERSO .tUN ►►��� Required DEPT.OF CO F,Vf•.L� ENT r SIGNATUR .11 • • • STORMWATER REPORT TRIAL RESIDENCE LOTS 7-11, BLOCK 7, TRAILS END ADDITION 60 SOUTH BEACH DRIVE PORT LUDLOW, WA 98365 PROJECT LOCATION The project is located on shores of the Hood Canal at South Point, south of Bridgehaven. The parcels are located in plat of Trails End First Addition and are known as Lots 7-11, Block 7. The site is also known as APN 950 100 709 - 711 in a portion of Section 16, T27N, R1E, W.M. The site is characterized as a waterfront residential development with a few single family residences. The project consists of a new single family residence on a separate parcel and the addition of garage for the existing residence. The driveway is be shared and covenants established for the joint use and maintenance of the two parcels. This stormwater management plan will examine the hydrology and changes to the stormwater runoff due to the proposed construction of the residence, the garage and the driveway construction. All proposed drainage improvements shall be consistent with the design standards of Jefferson County and the "Stormwater Management Manual for Western Washington" 2005 (DOE SMM). PRE-DEVELOPMENT SITE CONDITIONS The project area is presently un-improved and the ground cover consists of native grasses and brush. The "USDA Soil Conservation Service —Jefferson County Area" is unable to identify the existing soil inasmuch as it is a shoreline feature and the soil are most likely the accreation of shore line sands over time. DOWNSTREAM ANALYSIS The downstream storm drain system consists of a roadside ditch system that drains southwesterly along South Beach Road to the estuary located at the rear of the property. There were no obstructions observed to the free flow of stormwater for a quarter of mile downstream. Page 2 of 8 PROPOSED SITE DEVELOPMENT The private property site is to be developed with a typical single family residence under separate permits. The existing impervious area is at 2311 sft and with the addition of a new residence on the second lot, the total impervious area will increase to 4920 sft or 0.113 acres. This includes the new garage for the existing structure, the new residence and the shared driveway. PROPOSED STORMWATER IMPROVEMENTS The primary goal of the State DOE Stormwater Manual for Western Washington is to protect the streams of the.State and the Puget Sound. To comply with that goal, the Manual prescribes the treatment of runoff and the infiltration of the treated runoff into the soil to refurbish the ground water that the impervious areas have detracted. For this project, it is planned to utilize a newly constructed ditch along the front of the property parallel to the existing South Beach Drive pavement and then deposit the storm water runoff into a "raingarden" pond on-site. Overflow from the raingarden will be directed to the adjacent estuary area behind the residential site. The infiltration trench is designed in accordance with the WWHM3 computer system to receive and infiltrate the 2 year flow and the increase in the 100 year flow. The system relies on passing on the historical flow into the existing surface flow system downstream. HYDROLOGICAL ANALYSIS Attached is the report compiled by the new WWHM3 stormwater design that shows an infiltration trench will pass and satisfy the DOE Manual criteria. The following is a summary of the impervious areas: (see calculations attached) Existing Impervious areas : Existing residence 1489 sft = 0 . 034 Ac. Parking area 404 sft = 0 . 009 Sheds 418 sft = 0 . 010 Total Existing 2311 sft = 0 . 053 Ac. Page 3 of 8 . New Impervious areas : New Residence 2224 sft = 0.051 Ac. Existing residence 1489 sft = 0. 034 New Garage 675 sft = 0.016 Sheds to remain 89 sft = 0.002 Existing parking area 404 sft = 0.009 New driveway area 1443 sft = 0.033 Total New Construction 6324 sft = 0.145 PROPOSED STORMWATER FACILITIES In advance of the �P re arations for the design parameters for use in the WWHM3 P P program, an on-site infiltration test was made at the site. A hole with a six inch diameter, two feet deep was dug and filled with water for a 24 hour period in advance to the test. The test was done on January 19, 2009 and the rate of fall was measured at 7.5 inches per hour during a thirty minute test. Using this information and the factor of safety of 4 as required by the DOE Manual, the calculations indicate that irregular shaped pond of 135 sft has sufficient area to infiltrate the storm water emanating from the new and old residential construction. EROSION AND SEDIMENTATION IMPACTS The State 2005 DOE Manual specifies that each stormwater plan shall provide for the following elements: SECTION 2.5.1 MINIMUM REQUIREMENT #1 : PREPARATION OF STORMWATER SITE PLAN Please see attached construction plan entitled "STORMWATER PLAN - FRIAL RESIDENCE". SECTION 2.5.2 MINIMUM REQUIREMENT #2 : CONSTRUCTION STORMWATER POLLUTION PREVENTION (SWPP) All new development and redevelopment shall comply with Construction SWPP Elements #1 through #12 below: Element 1: Mark Clearing Limits The clearing limits will be the minimum required to construct the new residence, garage and new driveway connecting to South Beach Drive . Page 4 of 8 410 _ 411 Element 2: Establish Construction Access A construction access will be established at the new driveway location off South Beach Drive.The installation of quarry spells to minimize tracking sediments will be utilized as shown per the detail. Element 3: Control Flow Rates The downstream condition will not be materially affected by the increase in runoff due to the proposed development. The use of the infiltration pond/raingarden to capture the 100 year event and allowing the historical rate to continue to the existing storm drain system does not constitute a significant change to the overall storm drainage system. Element 4: Install Sediment Controls A silt fence will be set in place along the perimeter of the new construction along the downstream boundary of the site prior to the start of any construction to prevent siltation. Element 5: Stabilize Soils At the completion of the site grading for the building pads and subgrade for the paving areas, the areas disturbed by the new construction will be seeded and maintained during the remainder of the construction period. Upon completion of the driveway and single family residential construction, the final landscaping of the site will be installed to stabilize the soils. As required by the SMM, from October 1 through April 30, no soils shall remain exposed and unworked for more than 2 days . From May 1 to September 30, no soils shall remain exposed and unworked for more than 7 days. The soils will be temporary seeded or protected with plastic covering. Element 6: Protect Slopes All slope areas will be made at 3 : 1 and protected with hay and plastic coverings as required. Permanent landscaping will be installed at completion of rough grade. Element 7: Protect Drain Inlets No catch basins are proposed. All drainage will be Page 5 of 8 i established along the ground in a grassy swale. Element 8: Stabilize Channels and Outlets The site drainage does not affect any channels or outlets . Element 9: Control Pollutants As required by the SMM, all pollutants, including waste materials and demolition debris that occur on-site during construction shall .be handled and disposed of in a manner that does not cause contamination of storm water. Maintenance and repair of heavy equipment and vehicles involving oil changes and other maintenance work shall be conducted using spill prevention measures such as drip pans . Wheel wash or tire bath wastewater shall be discharged to a separate on-site treatment system. Element 10: Control De-watering No de-watering is anticipated with this project. Element 11: Maintain EMPs All temporary and permanent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function. All maintenance and repair shall be conducted in accordance with . the Jefferson County Stormwater Standards and the requirements of the State SMM. Sediment control BMPs shall be inspected weekly or after a runoff-producing storm event during the dry season and daily during the wet season. All temporary erosion and sediment control BMPs shall be removed within 30 days after final site stabilization is achieved or after temporary BMPs are no longer needed. Trapped sediment shall be removed or stabilized on site. Disturbed soil areas resulting from removal of BMPs or vegetation shall be permanently stabilized. Element 12: Manage The Project All aspects of this Stormwater Control Plan and the Construction Page 6 of 8 f , . SECTION 2.5.3 MINIMUM REQUIREMENT #3: SOURCE CONTROL OF POLLUTION This report and plan is consistent with the intent of the SMM to prevent stormwater from coming in contact with pollutants . As discussed above in the Elements, considerations have been employed with respect to the equipment on the site during construction to prevent pollutants entering the stormwater system. SECTION 2.5. 4 MINIMUM REQUIREMENT #4: PRESERVATION OF NATURAL DRAINAGE SYSTEMS AND OUTFALLS There are no natural drainage systems other than sheet flow across this property. The stormwater flows from the pavement areas will be flow on-site and be infiltrated. SECTION 2.5.5 MINIMUM REQUIREMENT #5 : ON-SITE STORMWATER MANAGEMENT The SMM principle goal is to infiltrate where possible. This plan has incorporated infiltration as a part of the storm water system. SECTION 2.5. 6 MINIMUM REQUIREMENT #6 : RUNOFF TREATMENT The proposed swale along the front property line will be planted with a native grass to provide biofiltration of the storm water flow from the new construction. SECTION 2.5. 7 MINIMUM REQUIREMENT #7: FLOW CONTROL The raingarden pond contains sufficient volume is sufficient to provide for the 2 yr flow and the increase in the 100 year flow in conformance with the goals of the SMM. SECTION 2.5. 8 MINIMUM REQUIREMENT #8: WETLAND PROTECTION The wetlands adjacent to this property will be protected by the implementation of the requirements of the wetlands report entitled "WETLAND ANALYSIS & REPORT, 5 LOTS, #60 & #80 SOUTH BEACH DRIVE", dated October 23, 2008 . SECTION 2.5. 9 MINIMUM REQUIREMENT #9:BASIN/WATERSHED PLANNING There are is no designated basin stormwater plan for this Page 7 of 8 t . ! • area. SECTION 2.5. 10 MINIMUM REQUIREMENT #10: OPERATION AND MAINTENANCE An Operation and Maintenance manual is attached as an attachment that provides for the maintenance procedures for the facilities proposed by this plan. The property owner will be responsible for the maintenance of the swale and the raingarden consistent with landscape plan. Stormwater Pollution Prevention Plan will be in place in accordance with the sequencing of the work and will be properly maintained by the contractor during construction and by the property owner upon completion and occupancy of the residence. SUMMARY In summary, the stormwater requirements are as shown on the attached copy of the Engineered Site plan illustrate the stormwater facilities proposed for the project that will infiltrate the low flows. TEMPORARY EROSION AND SEDIMENT CONTROL Temporary silt fences will be placed along the site as shown to provide erosion control during construction. Landscaping of all exposed soil will be completed as soon as possible to prevent any offsite soil deposition. Page 8 of 8 ATTACHMENT I PLANS Western Washington ology Model PROJECT 1�PORT • Project Name: default Site Address: SO BEACH DRIVE City PORT LUDLOW Report Date : 2/6/2009 Gage Port Angeles Data Start 1948/10/01 Data End 1993/09/30 Precip Scale: 1.14 PREDEVELOPED LAND USE Name Basin 1 Bypass: No GroundWater: No Pervious Land Use Acres A B, Forest, Flat .794 Impervious Land Use Acres ROOF TOPS FLAT 0.044 PARKING FLAT 0.009 Element Flows To: Surface Interflow Groundwater Name Basin 1 Bypass: No Groundwater: No Pervious Land Use Acres A B, Lawn, Flat .702 Tmpprvious Land Use Acres ROOF TOPS FLAT 0.103 DRIVEWAYS FLAT 0.033 PARKING FLAT 0.009 Element Flows To: • Surface Interflow Groundwater Irregular Pond 1, Irregular Pond 1, Name Irregular Pond 1 Depth: lft. Discharge Structure Riser Height: 1 ft. ■ ' `Element Flows To: Outlet 1 Outle• Irregular Pond Hydraulic Table Stage(ft) Area(acr) Volume(acr-ft) Dschrg(cfs) Infilt(cfs) 0.000 0.006 0.000 0.000 0.000 0.011 0.006 0.000 0.000 0.000 0.022 0.006 0.000 0.000 0.000 0.033 0.006 0.000 0.000 0.000 0.044 0.006 0.000 0.000 0.000 0.056 0.006 0.000 0.000 0.000 0.067 0.006 0.000 0.000 0.000 0.078 0.006 0.000 0.000 0.000 0.089 0.006 0.001 0.000 0.000 0.100 0.006 0.001 0.000 0.000 0.111 0.005 0.001 0.000 0.000 0.122 0.005 0.001 0.000 0.000 0.133 0.005 0.001 0.000 0.000 0.144 0.005 0.001 0.000 0.000 0.156 0.005 0.001 0.000 0.000 0.167 0.005 0.001 0.000 0.000 0.178 0.005 0.001 0.000 0.000 0.189 0.005 0.001 0.000 0.000 0.200 0.005 0.001 0.000 0.000 0.211 0.005 0.001 0.000 0.000 0.222 0.004 0.001 0.000 0.000 0.233 0.004 0.001 0.000 0.000 0.244 0.004 0.001 0.000 0.000 0.256 0.004 0.001 0.000 0.000 0.267 0.004 0.001 0.000 0.000 0.278 0.004 0.001 0.000 0.000 0.289 0.004 0.001 0.000 0.000 0.300 0.004 0.002 0.000 0.000 0.311 0.004 0.002 0.000 0.000 0.322 0.004 0.002 0.000 0.000 0.333 0.004 0.002 0.000 0.000 0.344 0.003 0.002 0.000 0.000 0.356 0.003 0.002 0.000 0.000 0.367 0.003 0.002 0.000 0.000 0.378 0.003 0.002 0.000 0.000 0.389 0.003 0.002 0.000 0.000 0.400 0.003 0.002 0.000 0.000 0.411 0.003 0.002 0.000 0.000 0.422 0.003 0.002 0.000 0.000 0.433 0.003 0.002 0.000 0.000 0.444 0.003 0.002 0.000 0.000 0.456 0.002 0.002 0.000 0.000 0.467 0.002 0.002 0.000 0.000 0.478 0.002 0.002 0.000 0.000 0.489 0.002 0.002 0.000 0.000 0.500 0.002 0.002 0.000 0.000 0.511 0.002 0.002 0.000 0.000 0.522 0.002 0.002 0.000 0.000 0.533 0.002 0.002 0.000 0.000 0.544 0.002 0.002 0.000 0.000 0.556 0.001 0.002 0.000 0.000 0.567 0.001 0.002 0.000 0.000 0.578 0.001 0.002 0.000 0.000 0.589 0.001 0.002 0.000 0.000 0.600 0.001 0.002 0.000 0.000 0.611 0.001 0.002 0.000 0.000 0.622 0.001 0.002 0.000 0.000 0.633 0.001 0.002 0.000 0.000 0.644 0.001 0.002 0.000 0.000 0.656 0.001 0.002 0.000 0.000 1 0.689 0.000 0.002 0 0.000 0.000 III 0.700 0.000 0.002 0.000 0.000 0.711 0.000 0.002 0.000 0.000 0.722 0.000 0.002 0.000 0.000 0.733 0.000 0.002 0.000 0.000 0.744 0.000 0.002 0.000 0.000 0.756 0.000 0.002 0.000 0.000 0.767 0.001 0.002 0.000 0.000 0.778 0.001 0.002 0.000 0.000 0.789 0.001 0.002 0.000 0.000 0.800 0.001 0.002 0.000 0.000 0.811 0.001 0.002 0.000 0.000 0.822 0.001 0.002 0.000 0.000 0.833 0.001 0.002 0.000 0.000 0.844 0.001 0.002 0.000 0.000 0.856 0.001 0.002 0.000 0.000 0.867 0.002 0.002 0.000 0.000 0.878 0.002 0.002 0.000 0.000 0.889 0.002 0.002 0.000 0.000 0.900 0.002 0.002 0.000 0.000 0.911 0.002 0.003 0.000 0.000 0.922 0.002 0.003 0.000 0.000 0.933 0.002 0.003 0.000 0.000 0.944 0.002 0.003 0.000 0.000 0.956 0.003 0.003 0.000 0.000 0.967 0.003 0.003 0.000 0.000 0.978 0.003 0.003 0.000 0.000 0.989 0.003 0.003 0.000 0.000 1.000 0.003 0.003 0.000 0.000 MITIGATED LAND USE ANALYSIS RESULTS Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year ' 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Yearly Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated Ranked Yearly Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated POC #1 The Facility PASSED Flow4CFS) Predev Dev Percer a Pass/Fail III 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass n nnnn n n n A , 0.0000 0 0 0 • Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass Water Quality BHP Flow and Volume for POC 1. On-line facility volume: 0 acre-feet On-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. Off-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. This program and accompanying documentation is provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by the user. Clear Creek Solutions and the Washington State Department of Ecology disclaims all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions and/or the Washington State Department of Ecology be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions or the Washington State Department of Ecology has been advised of the possibility of such damages. . , . . • 0 ' - ::&El .."WW1-1M3 FRIAL RESIDE,CE , . -,x,.n''' 7..',- 4t-"„...-ri%.,*_- .,i4,..,i.„,-,._--s,.1rz" tz:,-',.2.' 4.:4141.z.i.dL-1Wg7,.:.*"4-oe7l:,i',s:r-§,4k-:- n:=qtia;giyt-q:-":-e,F[I.L-5ti.g.."•,.Z,,o4,e-f--itg-a;-,-'''4''''...,i-S'',.,t,...,-'' '' 'CM.,.t:•-:4,A 74W3tt)5..0"1.,-.--,.=W.',„4",h,I,-'4, 7°'1.&4- 4,.'.'F3,*„*x!,;:,•I..,;e,p,A,:„-:,,,`.07k„.i:,t',1',:.' 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Their pollutant removal mechanisms include filtration, soil sorption, and uptake by vegetative root zones. Bio-infiltration swales have been used in Spokane County for many years to treat urban stormwater and recharge the ground water. In general,bio-infiltration swales are used for treating stormwater runoff from roofs,roads and parking lots. Runoff volumes greater than water quality design volume are typically overflowed to the subsurface through an appropriate conveyance facility such as a dry well,or an overflow channel to surface water. Overflows that are directed to a surface water must meet Minimum Requirement#7 or#8(whichever is applicable) unless the discharge is to a marine water,or qualifies for a flow control exemption in accordance with the criteria in Minimum Requirement#7. Additional Design Criteria Specific for Bio-infiltration&wales • The space available for ponding water within a Bio-infiltration swale can be sized by either: • Completely retaining the water quality design volume,i.e.,the 91st percentile,24-hour runoff volume indicated by an approved continuous runoff model (or,the runoff volume from a 6-month 24-hour storm). No reduction in volume is taken for any infiltration. Under this option,the overflow to a dry well or to a surface water must be above the elevation corresponding to the water quality design volume. • Using the same design sizing procedures outlined in Chapter 3 of Volume III for infiltration facilities designed as treatment facilities. • Drawdown time for the water quality design volume: 48 hours max. See Site Suitability Criterion(SSC 4)in Section 3.3.7, Chapter 3, Volume III. • Swale bottom: flat with a longitudinal slope less than 1%. • The maximum ponded level: 6 inches. • Treatment soil to be at least 18 inches thick with a CEC of at least 5 meq/100 gm dry soil,organic content of at least 1%, and sufficient target pollutant loading capacity. The design soil thickness may be reduced to as low as 6 inches if appropriate performance data demonstrates that the vegetated root zone and the natural soil can be expected to provide adequate removal and loading capacities for the target pollutants. The design professional should calculate the pollutant loading capacity of the treatment soil to estimate if there is February 2005 Volume V—Runoff Treatment BMPs 7-5 • a • • For more detailed information on maintenance, see Volume V, Section 4.6 —Maintenance Standards for Drainage Facilities. Verification of Performance During the first 1-2 years of operation verification testing(specified in SSC-9)is strongly recommended,along with a maintenance program that results in achieving expected performance levels. Operating and maintaining ground water monitoring wells (specified in Section 3.3.7- Site Suitability Criteria)is also strongly encouraged. 3.3.10 Infiltration Basins This section covers design and maintenance criteria specific for infiltration basins. (See schematic in Figure 3.25) Description: Infiltration basins are earthen impoundments used for the collection, temporary storage and infiltration of incoming stormwater runoff. Design Criteria Specific for Basins • Access should be provided for vehicles to easily maintain the forebay (presettling basin)area and not disturb vegetation,or resuspend sediment any more than is absolutely necessary. • The slope of the basin bottom should not exceed 3%in any direction. • A minimum of one foot of freeboard is recommended when establishing the design ponded water depth. Freeboard is measured from the rim of the infiltration facility to the maximum ponding level or from the rim down to the overflow point if overflow or a spillway is included. • Treatment infiltration basins must have sufficient vegetation established on the basin floor and side slopes to prevent erosion and sloughing and to provide additional pollutant removal. Erosion protection of inflow points to the basin must also be provided(e.g., riprap,flow spreaders,energy dissipators(See Chapter 4)). Select suitable vegetative materials for the basin floor and side slopes to be stabilized. Refer to Chapter 0 for recommended vegetation. • Lining material—Basins can be open or covered with a 6 to 12-inch layer of filter material such as coarse sand, or a suitable filter fabric to help prevent the buildup of impervious deposits on the soil surface. A nonwoven geotextile should be selected that will function sufficiently without plugging(see geotextile specifications in Appendix V-C of Volume V). The filter layer can be replaced or cleaned when/if it becomes clogged. February 2005 Volume Ill—Hydrologic Analysis and Flow Control BMPs 3-97 • i' �r r P '� N 34°11'48"E 142.70' : ,----------"7`v r. 4 •W N s 101 0 0 () S , 0 0° 0° (1) 4. Z ' ` • X28' BED c„ v ____________/V \ (9 I. , el c -O-PP 1"= 30' -` S 34°11'4. 41 • LEGAL DESCRIPTION: LOTS 8-11, BLOCK 7, TRAILS END 1ST AD SEC. 16, T2 7N, R 1 E, W.M. APN 951 100 709, PROPERTY OWNER: PAUL 1. FRIAL 60 SOUTH BEACH DR. PORT LUDLOW, WA 98365 ANDERSON 360-385—3578 VIL ENGINEERS DATUM: SURVEYORS NAGVD '88 DWNSEND, WA 98368 WSDOT MON. 10.056 360) 385-0398 •♦,•.•4,,,•4• MOM M MJA ., ,,t,�, AMMO S!� •••.... FEBRUARY 5, 2009...... "a' � _1 BEACH DRIVE ❖:❖:❖� 1 3:,3:::,::• -- SITE PLAN , ,pp.,.,.,.,4