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HomeMy WebLinkAbout05- StormwaterStep 2.1 All projects must read and complete the Stormwater Calculation Worksheet. Use the quantities reported in this worksheet to determine which minimum requirements apply to your project and what forms will be required using the "Flow Chart for Determining Minimum Requirements." Small Projects may submit the Worksheet S Small Project Certification sheet. Applicants who are able to sign the certification may STOP HERE. Submit the Stormwater Calculation Worksheet and Worksheet "S" with your appli- cation. No additional submittal is necessary. Medium Projects must complete worksheets Al, 131, and C or equivalent. Large Projects refer to Worksheet L to determine applicable worksheets are required or if a state -licensed engineer must prepare the submittal. A Note on Engineered Stormwater Submittal: -Many applicants complete stormwater submittal forms independently without professional expertise. For example, full dispersion, if feasible on the site (See Worksheet C), is typically easiest to implement for many different surface types such as roof, driveway, patio etc. -Applicants may opt to submit an engineered stormwater plan even if it isn't required. This option may be attractive to those who are unsure how some of the requirements will be achieved on the site.ln some instances, engineering will be required. Certain Large projects must be engineered (See Worksheet Q. Gathering information on infiltration feasibility may need an engineer's expertise. Or, sites with greater than 15% slopes may require applicants hire a geologist to recommend if a drainage method is appropriate. Discharging directly to a marine water via tightline must be engineered. If you cannot do full dispersion on parcels larger than 5 acres, engineering is required. In other instances, site constraints will require an engineered design. -Jefferson County staff may assist by providing and/or explaining Department of Ecology Stormwater Management Manual Circle one: The project requires or the applicant elects to submit an engineered stormwater plan. The plan is attached hereto with minimum requirement narrative, drawings, calculation, modeling output, construction pollution prevention El no plan, and site plan. If you answered YES above, STOP, no further submittal is required. Otherwise, proceed with the following steps. Step 3 Complete Worksheet Al Medium/Large Project Report and Stormwater Site Plan or equivalent. Step 3.1 Complete Worksheet C to determine which BMPs are possible and appropriate for your site. Circle the first BMP that is feasible (i.e. none of the infeasibility criteria is checked) for each surface type. Circle the corresponding BMP on Worksheet Al. Step 4 Complete Worksheet B1 Medium/Large Project Construction Pollution Prevention Plan and Worksheet B2 Construction Site Plan or equivalent. A Note on Commercial Projects: • Jefferson County Public Works (JCPW) reviews commercial projects and charges a review fee. JCPW may charge additional fees for any required inspections. • Any commercial projects proposing infiltration facilities may complete Worksheet E—Infiltration Test. Grain size analysis may be used instead of PIT. Commercial projects may elect to use BMP T5.10A and would not need a PIT, just a soil evaluation. • Any development for cottage industries may require a commercial public works review if full dispersion is infeasible. DEPARTMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street, Port"l'ownsend, WA 98368 T'eh 360.379,4450 1 Fax: 360.379.4451 Web: www.co.Jefferson.wa.us/con-imunitvdeveloPnient E-mail: dcd a)co.jefferson.wa.us 7 PARCEL# 963602301 (1 OF 27 PARCELS) PROJECTIAPPLICANT NAME: Scan the QR code to access the digital form DETERMINING STORMWATER MANAGEMENT REQUIREMENTS: This stormwater calculation worksheet should be completed first to classify the proposal as "small," "medium," or "large." The size determines whether a Stormwater Site Plan is required in conjunction with a stand-alone stormwater management permit application, building permit application, or other land use approval application that involves stormwater review. The basic information will also be helpful for completing a Stormwater Site Plan, if required. PARCEL SIZE (I.E., SITE Size of parcel 27 acres An acre contains 43,560 square feet. Multiply the acreage by this figure. Size of parcel in square feet 1,176,357 sq/ft Land -disturbing activity is any activity that results in movement of earth, or a change in the existing soil cover (both vegetative and non -vegetative) and/or the existing soil topography. Land disturbing activities include, but are not limited to clearing, grading, filling, excavation, and compaction associated with stabilization of structures and road construction. Native vegetation is vegetation comprised of plant species, other than noxious weeds, which reasonably could have been expected to naturally occur on the site. Examples include species such as Douglas fir, western hemlock, western red cedar, alder, big -leaf maple, and vine maple; shrubs such as willow, elderberry, salmonberry, and salal; herbaceous plants such as sword fern, foam flower, and fireweed. LAND DISTURBING ACTIVITY, CONVERSION OF NATIVE VEGETATION, AND VOLUME OF CUT/FILL Calculate the total area to be cleared, graded, filled, excavated, and/or compacted for proposed development project. Include in this calculation the area to be cleared for: Construction site for structures Drainfield, septic tank, etc. Well, utilities, etc. sq/ft sq/ft sq/ft Driveway, parking, roads, etc. sq/ft Lawn, landscaping, etc. sq/ft Other compacted surface, etc. Temporary construction area Total Land Disturbance 1 ,176,357 sq/ft sq/ft Answer the following two questions related to conversion of native vegetation: Does the project convert % acres or more of native vegetation to lawn or landscaped areas? Circle: Yes No Does the project convert 2'/2 acres or more of native vegetation to pasture? Circle: Yes No Indicate Total Volumes of Proposed: (Includes BMP T6.13 Fill Volume) sq/ft Cut Fill (culyd) stormwater talc worksheet QR code — REV. 5/31/2019 page 1 of 2 STORMWATER CALCULATIONS — IMPERVIOUS SURFACE Impervious surface is a hard surface that either prevents or slows the entry of water into the soil as under natural conditions prior to development. A hard surface area which causes water to run off the surface in greater quantities or at an increased rate of flow from the flow present under natural conditions prior to development. Common impervious surfaces include, but are not limited to roof tops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled, macadam or other surfaces which similarly impede the natural infiltration of stormwater. NEW EXISTING Structures (all roof area) sq/ft Structures (all roof area) sq/ft Sidewalks sq/ft Sidewalks sq/ft Patios sq/ft Patios sq/ft Solid Decks sq/ft Solid Decks sq/ft (without infiltration below) (without infiltration below) Driveway, parking, roads, etc sq/ft Driveway, parking, roads, etc sq/ft Other sq/ft Other sq/ft 0.0 Total New sq/ft Total Existing sq/ft TOTAL NEW + TOTAL EXISTING* NSA sq/ft 'This amount will be used to check total lot coverage. DEVELOPMENT v. REDEVELOPMENT Divide the total existing Does the site have > 35% or more ♦ no impervious surface above by the existing impervious surface? size of the parcel and convert to a percentage. The proposal is considered new development. Answer yes questions in Figure 2.4.1 Flow Chart for New Development to determine project size (next page). The proposal is considered redevelopment Answer questions in Figure 2.4.2. Flow Chart for Redevelopment to determine project size (next page). — Applicants for "small' projects must comply only with Minimum Requirement #2—Construction Stormwater Pollution Prevention. Please submit the Small Project Certification (Worksheet "s). The proponent is responsible for employing the 12 Elements to control erosion and prevent sediment and other pollutants from leaving the site during the construction phase of the project. Pick up the Construction Stormwater Pollution Prevention (SWPPP) Best Management Practices (BMPs) Fact Sheet. — Applicants for "medium" projects —those that must meet only Minimum Requirements #1 through #5 must submit Worksheet Al and B1, a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference A1A and 131A for guidance).). — "Large" projects —those that must meet all 9 Minimum Requirements— must submit Worksheet Al and B1, a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference A1A and 131A for guidance). Large projects also may require engineering. See Worksheet L to determine additional large project requirements. APPLICANT SIGNATURE By signing the Stormwater Calculation Worksheet, I as the applicant/owner attest that the information provided herein is true and c rrect to the best of y knowledge. I also certify that this application is being made with the full knowledge and consent of'all owners of the affe ed prop rty. W R OR A ORI . D PR NTATIVE Sid stormwater caic workshe R code — REV. 5/31/2019 3 514?1 (DATE) page 2 of 2 Figure 2.4.1 Flow Chart for New Development stwtuere .. ........ ... Does the site have ----- - ------ --- .... See Redevelopment 35% or more of . Yes . . . ... . ....... Minimum existing impervious . Requirements and coverage? Flow Chart No .11. Do 11 es .. the project - convert 1! (Figure 3.3) % acres or more of Does the project vegetation to lawn or result in 5,000 -------- landscaped areas, or square feet, or No convert 2.5 acres or more greater, of new plus of native vegetation to replaced hard pasture? surface area? . . .. ......... ....... ..... .. Does the project Yes Yes No result in 2,000 square feet, or greater, of new plus replaced All Minimum hard surface area? Requirements apply ply to the new and replaced hard surfaces I and converted Yes No vegetation areas. r. Minimum Requirements Does the project have This is a "large" project. A I through #5 apply t the new and replaced land disturbing Large projects refer to hard surfaces and the Yes activities of 7,000 square feet or greater? Worksheet 1, for submittal land disturbed. .1, 1 requirements. At a �,, 01,4'.0111111 . g i I M 11,10 011110 " , , -, I - -�d I j. 11117 Th's is a �'In( I No minimum, all large Project projea, Submit A must submit Worksheet WOrksheel, A.1,B]. Minimum Al, B1, and C or and C or Requirement 42 equivalent. equivalent. applies. Complete "Small'I'MisTe lor Project. Tnust follow Const ruction Pollution Figure 2.4.1 — Flow Chart for Determining Requirements for New Development ..... . .... . .. ... .. . Volume I —Minimum Technical Requirements —August 2012 2-10 :Fact Sheet Figure 2.4.2 Flow Char(: for Redevelopment Does the project result in 2,000 square feet, or more, of new plus replaced hard surface area? OR Does the land disturbing activity total 7,000 square feet or greater? Yes No Minimum Requirements through #5 apply to Minimum Requirements #2 applies. the new and replaced hard surfaces and the land disturbed. Does the project add 5,000 square feet or more of new hard surfaces? OR Convert'/a acres or more of vegetation to lawn or landscaped areas? OR Convert 2.5 acres or more of native vegetation to pasture? Yes No All Minimum Requirements apply to the new hard surfaces and the converted vpgqW'lon areas. Next Question Is this a road related project? Yes No Does the project add 5,000 square feet or more of new hard surfaces? W X Yes No additional requirements No Is the total of new plus replaced hard surfaces 5,000 square feet or more, AND does the value of the proposed improvements — including interior improvements —exceed 50% of the assessed value (or replacement value) of the existing site improvements? Yes , No additional r requirements All Minimum Requirements apply to the new and replaced hard surfaces and converted vegetation areas. Figure 24.2— Flow Chart for Determining Requirements for Redevelopment This is a arge project barge projects reter to Worksheet f for submittal requirements. At a minimum, all large Project must submit Worksh t AI, B1, and C or equ'valent. olume I— Minimum Tec�Zn ical Requirements —August 2012 2-11 Large Projects subject to Minimum Requirements #1 -9 must complete Worksheet Al as applicable. Also complete Worksheet 61. Does the project discharge to a sub basin draining to salt water, Dosewallips River, or Hoh River? E Does the project meet feasibility criteria for full dispersion (see Worksheet Cl)? —� no No Further action needed. Demonstrate full dispersion on site plan. 1 Is the project in the Urban Growth Area? Fn 1 Yes Use List #3 on Worksheet Al page 6. No further action is needed. Is the project on a parcel 5 acres or larger? Yes Fa The proponent must submit a stormwater report and site plan prepared by a licensed engineer that complies with the 2012 Department of Ecology Stormwater Man- agement Manual for West- ern Washington as amended in 2014. The report prepared by the engineer must demonstrate compliance with the LID Performance Standard and all minimum requirements. For each surface consider the BMPs in the order listed in List #1 page 5 in Worksheet Al, except, raingardens may not be used. This process is equiva- lent to List #2 in the 2012 Department of Ecology Stormwater Management Manual for Western Washington as amended in 2014. Yes 621 Sheridan Street, Port Townsend, WA 98368 Tel: 360.379.4450 1 Fax: 360.379.4451 Web: www.co.iefferson.wa.us%communit dy evelopment E-mail: dcdgco.jefferson.wa.us CONSTRUCTION STORMATER POLLUTION PREVENTION Rest Management Practices (BMPs) Fact Sheet For "small' projects (as determined through the Stormwater Calculation Worksheet), submit Worksheet "S Small Project Certification. Additionally, the applicant shall consider the twelve Construction Stormwater Pollution Prevention elements and implement applicable BMPs. A set of useful BMPs for typical rural residential construction is attached. There is no additional submittal required as part of the permit application. For "medium" and "large" projects, applicants must submit a Construction Stormwater Pollution Prevention Plan (SWPPP) and a Stormwater Site Plan (applicants may use Worksheet B1 or equivalent). The following twelve elements must be considered for Construction Stormwater Pollution Prevention before and during the construction phase of the project: 1. Mark Clearing Limits 7. Protect Drain Inlets 2. Establish Construction Access 8. Stabilize Channels and Outlets 3. Control Flow Rates 9. Control Pollutants 4. Install Sediment Controls 10. Control De -Watering 5. Stabilize Soils 11. Maintain Best Management Practices 6. Protect Slopes 12. Manage The Project Each of the twelve elements is described in more detail below: 1. Mark Clearing Limits By minimizing the limits of clearing on the site, a builder can minimize stormwater runoff and provide effective control of pollution. 2. Establish Construction Access Much of the sediment that leaves a construction site does so on the wheels of delivery and construction vehicles that drive off a project site. Construction access must be limited to a single location and a properly constructed Stabilized Construction Entrance (BMP C105) should be included on the site. 3. Control Flow Rates Stormwater that leaves a project site unimpeded may exceed the capacity of the existing stormwater control facilities downstream and may contain sediment that may be deposited as the velocity of the runoff decreases. Stormwater protection on a construction site should include measures to control the flow rate of runoff from the site. This can be done by installing a Sediment Trap (BMP C240) or other measure that will impede the flow of water off a construction site. 4. Install Sediment Controls In addition to limiting the rate of stormwater flow off a construction site, measures should be put in place to treat the runoff and remove sediment. Limiting of the cleared area (Element 1) will assist in this effort, but there will be exposed soils that may move with the runoff. Suggested BMPs for controlling sediment include Straw Wattles (BMPC235), Brush Barrier (BMP C231), Gravel Filter Berm (BMP C232), and Silt Fence (BMP C233). Installation of a Sediment Trap (Element 3) is an additional sediment control feature. construction Pollution Prevention Page 1 of 3 5/31/2019 5. Stabilize Soils An additional measure that can minimize sediment transport in runoff is to stabilize soils on the site with mulch or some other covering. This will limit the amount of soil that is exposed to rainfall, thus limiting the sediment that could potentially leave the site. BMPs that could be used for this include Mulching (BMP C121), Nets and Blankets (BMP C122), and Plastic Covering (BMP C123). During periods of dry weather dust can become a problem and sediment could be transported from the site in high winds. BMP C140 Dust Control should be followed to limit loss of soils in windy conditions. 6. Protect Slopes If the cleared area includes slopes of 3:1 (Horizontal: Vertical) or steeper, the slopes should be protected to limit runoff. If the slopes are not protected, rills and gullies may form, transporting sediment to the lower elevations and potentially off the construction site. The slopes should be graded to minimize erosion and runoff at the downstream end of the slopes, and runoff should be collected and treated. The following BMPs could be used Surface Roughening (BMP C130), Interceptor Dike and Swale (BMP C200), and Pipe Slope Drains (BMP C204). 7. Protect Drain Inlets Runoff from urban construction sites often discharges into existing stormwater collection systems. Water enters the collection system through drain inlets. If there are drain inlets downstream of a construction site, they should be protected using BMP C220 Storm Drain Inlet Protection. 8. Stabilize Channels and Outlets Any temporary on -site channels or ditches that are used to control runoff should be stabilized to prevent erosion in the channel. BMP C202 Channel Lining and BMP C209 Outlet Protection should be used. 9. Control Pollutants The best way to control pollution is to limit the source of pollution. Construction debris should be maintained in a safe location. Vehicle maintenance on the construction site should be minimized and any spill should be promptly cleaned up. Concrete spillage should be kept to a minimum and cleaning of the concrete trucks after they have unloaded should be done in an area that will not drain off site (see BMP C151 Concrete Handling). 10. Control Dewatering In some cases, excavation for the foundation or below ground structures will encounter ground water. This water must be removed (dewatered) from the excavation. Discharge of this ground water must be treated in a manner that will not cause damage downstream due to flow rates or added pollution. There are no specific BMP identified for this activity, but the water should be handled with care to assure that soils or other pollutants are not added to this flow. 11. Maintain BMPs Installation of the appropriate BMPs is not adequate to completely control stormwater runoff. The BMPs that have been installed on the project must be inspected and maintained during the duration of the construction project. In addition, the temporary controls that were installed for construction should be removed within 30 days of completion of the work. Typically, once construction has been completed, the temporary facilities are not maintained, and by removing the facilities, it will ensure that these won't fail and discharge water or sediment that had been previously trapped or contained. 12. Manage the Project Management of a project has four aspects: 1. Phasing construction to prevent transportation of runoff and sediment, 2. Limiting the work during seasons where large amounts of rainfall could be anticipated, 3. Coordination with Utilities and other Contractors, and 4. Inspection and Monitoring. All of these for aspects are important and must be followed to ensure a project that will have minimal impact on the environment. Volume II of the Manual contains additional BMPs that could be used on -site. The applicant is encouraged to review the Manual to see if other BMPs may be applicable to, or more useful on, a particular site. construction Pollution Prevention Page 2 of 3 5/3112019 Best Management Practices from 2014 Ecology Stormwater Management Manual The following BMPs for Construction Stormwater Pollution Prevention are sediment and erosion control measures for the construction phase of typical rural residential development. Some projects may not require implementation of all of these BMPs; others may require additional measures not listed here. jir II4.1 Source Control BMPs BMP C154: Concrete Washout Area BMP C101: Preserving, Natural Vegetation BMP C160: Certified Erosion and Sediment BMP C102: Buffer Zones Control Lead BMP C103: High Visibility Fence BMP C162: Scheduling BMP C105: Stabilized. Construction Entrance / II-4.2 Itwaoff Conveyance and Treatment i3MPs Exit BMP C106: Wheel Wash BMP C107• Construction Road/Parking Area Stabilization BMP C120: Temporary and Permanent Seeding BMP C121: Mulching BMP C122: Nets and Blankets BMP C123: Plastic Covering BMP C124: Sodding BMP C125: Topsoilin T /� Composting BMP C126: Polyacylamide (PAM for Soil Erosion Protection BMP C130: Surface Roughening BMP C131: Gradient Terraces BMP C1.40: Dust Control BMP C150: Materials on Hand BMP C151: Concrete Handling BMP C152: Sawcutting and Surfacing; Pollution Prevention BMP C153: Material Delivery, Storage and Containment BMP C200: Interceptor Dike and Swale BMP C201: Grass -Lined Channels BMP C202: Channel Lirdng BMP C203: Water Bars BMP C204: Pipe Slope Drains BMP C205: Subsurface Drains BMP C206: Level Spreader BMP C207: Check Dams BMP C208: Triangular Silt Dike (TSD (Geotextile-Encased Check Dam) BMP C209: Outlet Protection BMP C220: Storm. Drain Inlet Protection. BMP C231: Brush Barrier BMP C232: Gravel Filter Berm BMP C233: Silt Fence BMP C234: Vegetated Strip BMP C235: Wattles BMP C236: Vegetative Filtration BMP C240: Sediment Trap BMP C241: Temporary Sediment Pond BMP C251: Construction Stormwater Filtration construction Pollution Prevention Page 3 of 3 5/31/2019 Minimum Requirement # 1 : Preparation of Stormwater Site Plan Complete the following: Submit a site plan demonstrating the project. Refer to REFERENCE A1A for examples of Best Management Practices (BMPs) that you can use. Remember that all site plans submitted for the project must be consistent and accurate. Describe both existing and proposed site conditions for the following items as applicable in the space below each bullet point. Attach additional pages if needed. • structures I N/A I N/A • I We do not expect any run-on from neighboring properties. Cut=17,000 cubic yards, Fill = 8,000 cubic yards — expected worK to 15e done in Hight-or-wa N/A Minimum Requirement # 2 : Construction Stormwater Pollution Prevention Plan (SWPPP A SWPPP is designed to be a stand-alone document that addresses construction stormwater management concerns. This document is required to be kept by the contractor performing the work at the jobsite for reference and update during the life of the project. Construction BM P's must be indicated on the stormwater site plan. REFERENCE B1A includes diagrams of common BMP's that may be used on the site plan. Al My completed SWPPP (WORKSHEET B1 or equivalent) is included in this application packet! Minimum Requirement # 3 : Source Control of Pollution (not construction related) The intent of source control is to prevent stormwater from coming in contact with pollutants. Source control BMPs can be operational or structural in nature. A roof over a material storage area is an example of a structural source control BMP. Washing yourvehicle on the lawn rather than in the street is an operational BMP. This requirement is generally not applicable to Single Family Residences (SFRs); however, ways to minimize pollution from moving downstream should be considered during the design phase of every project. Specifications on standard source control BMPs that are applicable to various commercial and industrial -type facilities can be found in Volume IV of the 2014 Stormwater Management Manual for Western Washington (SWMMWW) (continued on page 2). page 1 of 6 Minimum Requirement # 3 : Source Control of Pollution (continued from page 1) Check one of the following boxes that best represents your project with regards to MR #3. My project is a Single Family Residence (SFR) and after considering operational and structural measures to prevent LA stormwater from coming in contact with pollutants, I have: 0 determined this MR to not be applicable. El made appropriate adjustments to my project. EB3My project is not a SFR and after reviewing Vol. IV of the SWMMWW, I have determined that this MR is not applicable because of the following reason: My project is not a SFR and after reviewing Vol. IV of the SWMMWW, I have determined that the following source control BMPs are applicable to my project and shall be incorporated into the project design and operation. S407, S411, S414, S421 page 2 of 6 Minimum Requirement # 4 : Preservation of Natural Drainage Systems Creating new drainage patterns results in more site disturbance and more potential for erosion and sedimentation during and after construction. to the maximum extent possible, proponents must 1) maintain the natural on -site drainage pattern and concentrated discharge location at the downstream property boundary, and 2) prevent erosion at and downstream of the discharge location. NOTE: All outfalls require energy dissipation. See Table 4.5.1 in Vol. V of the SWMMWW for minimum design standards for rock protection at outfalls. Choose the option below that best describes your project: OF The project site does not currently have any intermittent, seasonal, or continuous concentrated water moving across any part of the property and the proposed improvements to the site will not create new concentrated flow paths or not discharging to existing drainage systems. s The project site has existing concentrated flow drainage systems and outfalls. (NOTE: These items must be graphically shown on the Site Plan or equivalent, to include: type, slope, dimensions, channel lining, direction of flow, buffer, etc.) Select below how it will be addressed. E] This project will not alter the existing drainage system in any way. If the existing outfall(s) show signs of erosion and scour, energy dissipation measures will be installed or improved upon. Construction activity of any kind will not occur within at least 10 ft. of the edge of the channelized flow. BMP C102: BUFFER ZONES will be implemented during the life of the project to include visible flagging or other demarcation technique. The existing concentrated drainage system traversing the property will be impacted as part of this project, as described in the space below and shown on the site plans. Engineering calculations are required that show the altered drainage design can accommodate the existing flows and the added runoff contributed by the project. page 3 of 6 Minimum Requirement # 5 : On -site Stormwater Management On -site stormwater management techniques shall be implemented where possible to accommodate the permanently added stormwater runoff being generated by development. Some on -site stormwater management techniques provide better stormwater detention and treatment than others; however, they are not always appropriate for use due to varying individual site characteristics. Therefore, techniques are presented to applicants on the next pages in a hierarchical order and shall be considered for use in the order listed. The first technique on the list that is determined to be possible shall be implemented. See WORKSHEET C to determine which techniques are feasible. Runoff from developments occurring in drainage basins that drain directly or indirectly to a creek require a higher level of stormwater management, thus, the techniques are presented in three lists below: All properties will be in one of these three categories: FNI My project is located in a drainage subbasin that My Project will discharge to a subasin draining to drains to directly or indirectly to freshwater. salt water, Dosewallips River, or Hoh River. PROCEED to Page 5 to use LIST #.. PROCEED to Page 6 to use LIST #. My project is a large project. Refer to Worksheet L. If full dispersion isn't feasible, use LIST #1 (List #2 and List #1 are the same except raingardens are not permitted in List #2). page 4 of 6 Minimum Requirement # 5 : On -site Stormwater Management (continued) LIST # 1 : Applicable to projects that directly or indirectly drain to freshwater. For each category below, proceed through the LIST from top down. Use WORKSHEET C to determine if the BMP can be used. If number 1 on the list is not possible, document why on WORKSHEET C and move down to number 2,and soon. INSTRUCTIONS: Check the first option that will work for Each Categor Below: Category A:Lawn and Landscape Areas Myproject does not have disturbed soils not covered byimpervious surfaces. U 0�� 1' Post'ConstruchonSoil Ouuktyand Depth Disturbed soils shall beamended (BMPTS.13:). Category B:Roofs U�� Q�� K4yproject does not have Roof aveas ' ' 077� 1. Full Dispersion (BK8PTl38) on Downspout Full Infiltration (BW1PTS.1OA) 3. Rain Garden (LARGE PROJECTS CANNOT USE) (BMPTS.14A) F� 3 Downspout �0� ' ' 0�� 4. P��orotedStub'OutConnecdon(8K0PT5.1O) e�� ' S. Each BMPabove iuinfeasible, see VVORKSHEETC.STOP U COMPLETE AND SUBMIT VVORK3HEETBl.NOOTHER INFORMATION REQUIRED ATTH|6TIME. Category C:Other Hard Surfaces, e.g.gravel and paved driveways, solid decks and patios without infiltration below �� Q�0 Myproject does not have Other Hard Surface areas 1. Full dispersion (BIVIPTS3O) 2. Permeable Pavement (8KVPTS.1S) @0�| on Rain Garden (LARGE PROJECTS CANNOT USE) (BMPT5.14A) 3. Sheet Flow Dispersion (BW1PTS.1%) OR Concentrated Flow Dispersion (8MPTS.11) U�� 4. Each item above isinfeasible, see VVORK8HEETC.STOP �� COMPLETE AND SUBMIT VV0KK3HEETB1.NOOTHER �� INFORMATION REQUIRED ATTH|STIME. Minimum Requirement # 5 : On -site Stormwater Management (continued) LIST # 3 :Applicable to project that discharges to a subbasin draining to saltwater, the DosewaIIips River, or the Hoh River. INSTRUCTIONS: For each category, choose one option. Use Worksheet C to determine if the BMP can be used on the site. Category A: Lawn and Landscape Areas 0 My project does not have disturbed soils not covered by impervious surfaces. 1. Post -Construction Soil Quality and Depth Disturbed soils shall be amended (BMP T5.13: ). 0 My project does not have Roof areas. .J 1. Downspout Full Infiltration (BMP T5.10A) *Optional - may elect to install BMP T5.14A Rain Garden* 2. BMP T5.10B: Downspout Dispersion System 3. BMP T5.10C: Perforated Stub -Out Connection I 4. Each BMP above is infeasible, see WORKSHEET C. Category C: Other Hard Surfaces '; My project does not have Other Hard Surface areas *Optional - may elect to install BMP T5.15: Permeable Pavement OR BMP T5.14A: Rain Garden* El 1. BMP T5.12: Sheet Flow Dispersion 2. BMP T5.11: Concentrated Flow Dispersion El 3. Each item above is infeasible, see WORKSHEETC. STOP. COMPLETE AND SUBMIT WORKSHEET B1. NO OTHER INFORMATION REQUIRED AT THIS TIME. page 6 of 6 Infiltration Trench Plan View pwPat Profile View apaanaark A pamra�appIMa 1y aror Section A -A Dr well CA 711 uea ire aM1A�mi 0 Plan View!u �� �sgasnbKK Iynre aiasiry Alin. xmv,w.s 111­'or.iiAn1s . Section View 1-1— Perforated Stub -out Connection See the DOE Manual, Volume 3, for requirements. Post-Contstruction Soil Quality &Depth Al aP A �T�OOA oAR as EOA a� r`1O eAMEernure or,xEvou,Me Frwwoarnmx�kco.rxEA<nww�aMr pr DEFINITIONS: ....cx....W.",nrwsns"amlii>xer°�ux"n,,"gE.w°v,si..m r`ews x� =l1RA1 SYMBOL:&1O aavaRasa,wma,a, Raingarden or Bioretention P.Ws e V d.p ntlmp R_ Prw,tlea W`r"b sW'eSxalk mmm�a�aa r I aagaa,m ak Egad r ,1'ml"Imum are sbntlplpe Itlexalk �curbcul ee9 a, Is, ors o a W"`tlelze orsvl� Minimum rapamWn reAas. In penal gaeeav5l see Oeslgne Itlance 10.01—IR.Ron boil = MetlW ISSM) pnalM1reM1 velerbble, beemek ormM1erlmperviaus layer See the Western Washington ITS In Garden Handbook for more detailed mingarden design Information. Seethe 2014 Department of Ecology Stormwater Management Manual for Western Washington BMP T730 for Bioretenticn design, Nabs 1. Sm,iry sub0retle 3"min. belwa Narabmlo" oar In,blb,lpn ]. Canpaq BSM b05%par AS1MI5'rl 4. A Vegetated Flow Path of at least 25' between structure, property line, stream, etc. SHEET FLOW DISPERSION Ill at ft mmkratdy sk0tv wwmys kw4r* REFERENCE A1A- Permanent Stormwater BM Options site plan looking too crowded? Use the letters UTIMZATION OF TRIM TEMPLATE 6 OPTIONAL IF ELECTED BY THE APPUCANT FOR USE, THE SMPS SHOWN ON THIS SHEET MUST BE BUILT AS on this page as reference instead of drawing SPECIFIED HERE AND IN THE MOST RECENT DOE MANUAL IF ANY CONFLICT EXISTS, THE DOE MANUAL SUPERCEDES, the BMP Be sure to indicate location, sizing (if SJj -yoao A rough -in inspection is required prior to infiltration facility or pipe burial. Call 360-379-4455 to schedule an inspection. applicable) and pipe locations. ❑ N F13 Submit a site plan demonstrating the construction protective measures or best management practices that will be used for the project during the construction phase. Refer to REFERENCE 131A for examples of Construction Best Management Practices (BMP's) that you can use. The activities that take place during construction are the highest risk for stormwater problems such as erosion and sediment control (you may need to provide an additional site plan with greater detail for stormwater features. If so, make sure it is consistent with the primary site plan. Remember that all site plans submitted for the project must be consistent and accurate). Element 1: Preserve Vegetation / Marl(Clearing Limits The goal of this element is to preserve native vegetation and to clearly show the limits of disturbance. Choose any of the following that apply: The perimeter of the area to be cleared shall be marked prior to clearing operation with visible flagging, orange plastic barrier fencing and/or orange silt fencing as shown on the SWPPP site plan. Vehicles will only be allowed in the areas to be graded, so no compaction of the undeveloped areas will occur. If this option is selected check the BMPS you will use below: C101 Preservin NatxaalED C 102 ilufFer C103 Hi h Visibilit Ve eta ion Zones Fence It is necessary to disturb the entire property during this project due to existing site conditions, property constraints, and proposed design. I understand that all disturbed land not covered by hard surface at the end of the project is subject to soil amendment requirements per BMP T5.13 Post -Construction Soil Quality and Depth. The site was cleared as part of clearing activity that is subject to an enforcement action and will be re -vegetated. Restoration may be necessary to comply with Critical Area Regulations or stormwater requirements. Buffer Zones- BMP C102 may apply if Critical Areas exist on -site and buffer zones shall be protected. Element 2: Construction Access The goal of this element is to provide a stabilized construction entrance/exit to prevent or reduce or sediment track out. Choose one of the following: The driveway to the construction area already exists and will be used for construction access. All equipment and vehicles will be restricted to staying on that existing impervious surface. If sediment is tracked off site, the road- way will be cleaned thoroughly at the end of each day. A stabilized construction entrance will be installed prior to any vehicles entering the site, at the location shown on the SWPPP site plan. If sediment is tracked off site, the roadway will be cleaned thoroughly at the end of each day. If this option is selected check the BM PS you will use below: ❑ C105 Stabilized LiC1.06 t�erh.ecl 0 C107 Co s :r ,. ion Construction Ent.rance_(_ Wash. Road / Parlcixa Area Exit Stabi.l.ization. page 1 of 6 Element 3: Control Flow Rates The goal of this element is to construct retention or detention facilities when necessary to protect properties and waterways downstream of development sites from erosion and turbid discharges. This element does not apply to my project because (check any that apply): Site is mildly sloped (<5%), EDThere are no individually sloped sections greater than 10%, The bulk of the project is scheduled to occur during dry season (May 1-Sept 30) Element 4: Sediment Control The goal of this element is to construct sediment control BMPs that minimize sediment discharges from the site. Select one of the two statements applicable to the project. LJ The site has already been stabilized and re -vegetated. Sediment control BMPs shall be placed at the locations shown on the SWPPP Site Plan. If this option is selected check the BMPS you will use below: 0 C231 Brash Barrier C233 Silt Fence C 2,3,5yattle.s y .:, '', C;232 GrWMLjjiter _ C234 Vegetated Bean. St.ri. Element 5: Stabilize Soils The goal of this element is to stabilize exposed and unworked soils by implementing erosion control BMPs. Select one of the three statements applicable to the project. My project will ensure the following: • Soil stockpiles will be located within the disturbed area shown on the SWPPP Site Plan. • Soil excavated for the foundation will be backfilled against the foundation and graded to drain away from the building. • No soils shall remain exposed and unworked for more than 7 days from May 1 to September 30 or more than 2 days from October 1 to April 30. Once the disturbed landscape areas are graded, the grass areas will be amended. All stockpiles will be covered with plastic or burlap if left unworked. This element does not apply to my project because: 0 My project must implement specific BMP's to ensure compliance. (Check BMP's you will use on the next page). page 2of6 C120 Temporary 8r M C122 Nets & Blanke s W C1.24 Sodding C131 Gradient. Permanent See" Terraces nE C;121. Mulch.in,g C123 Plastic Cove jUnN C125 To,Psoil / � � C140 Dust Con . of Com aostin 0 C235 M attles Element 6: Protect Slopes The goal of this element is to design and construct cut -and -fill slopes in a manner to minimize erosion. Select one of the two statements applicable to the project. No cut slopes over 4 feet high or slopes steeper than 2 feet horizontal to 1 foot vertical, and no fill slopes over 4 feet high will exceed 3 feet horizontal to 1 foot vertical. Therefore, there is no requirement for additional engineered slope protection. 0 The above checkbox is not checked. My submittal is designed by a licensed geologist to protect slopes. Based on the licensed professionals recommendation (please attach their evaluation), the following BMP's will be used: C120 Temnorary & Pe1 rnacienl 0 C205 Su LJ icg C207 Clieck Danis Seedin Drains C204 Pike SIL)12g Drains C206 T,evel. Spreader ffJ C208 Triangular Silt Dike (Geotextile-Encased Check Dams Element 7: Protect Permanent Drain Inlets The goal of this element is to protect storm drain inlets during construction to prevent stormwater runoff from entering the conveyance system without being filtered or treated. Select one of the three statements applicable to the project. 0 The site has open ditches in the right-of-way or private road right-of-way. There are no catch basins on or near the site. Li Catch basins on the site or immediately off site in the right-of-way are shown on the SWPPP Site Plan. Storm drain inlet protection shall be installed. If this option is selected check the BMPS you will use below: E] C220 Storm arain Inlet Protection. page 3 of 6 Element 8: Stabilize Channels and Outlets The goal of this element is to design, construct, and stabilize on -site conveyance channels to prevent erosion from entering existing stormwater outFalls and conveyance systems. Select one of the three statements applicable to the project. Construction will occur during the dry weather. No storm drainage channels or ditches shall be constructed either temporary or permanent. XThere are no existing or proposed stormwater conveyance channels on the project site. 0 A wattle shall be placed at the end of the Swale to prevent erosion at the outlet of the Swale. If this option is selected check the BMPS you will use below: C202 Channel Li.nin C207 Check Dams '% C209 Cutlet Protection C235 Wattles Element 9: Control Pollutants The goal of this element is to design, install, implement and maintain BMPs to minimize the discharge of pollutants from material storage areas, fuel handling, equipment cleaning, management of waste materials, etc. This element does not apply to my project because (circle any that apply - If any box is unchecked this element applies. ElThere will be no concrete work, There will be no sawcutting work, There will be no hazardous materials on -site, There will be no fertilizer or pesticide application, LJ There will be no heavy equipment associated with this project, There will be no pressure washing, equipment maintenance or dewatering If one or more of the checkboxes above are unchecked. Any and all pollutants, chemicals, liquid products and other materials that have the potential to pose a threat to human health or the environment will be covered, contained, and protected from vandalism. All such products shall be kept under cover in a secure location on -site. Concrete handling shall follow BMP C151 C154. If this option is selected check the BMPS you will use below: C151 Concrete Handlin C152 SahTcutting and Suri�tcin Polhztion Prevention 0 C153 Material Deliver St.,, , and. Containment ' C154 Concrete Washout Area page 4 of 6 Element 10: Control De -watering The goal of this element is to handle turbid or contaminated water from dewatering (removal of water) separately from stormwater. Select one of the two statements applicable to the project. 0 No dewatering of the site is anticipated. LJ Dewatering of the site is anticipated. If this option is selected check the BMPS you will use below: CM-3Mter Bars U C236-Vegetated Filtration [:] C206 Level Snreacler Element 11: Maintain Best Management Practices The goal of this element is to maintain and repair all temporary and permanent erosion and sediment control BMPs to assure continued performance. Describe the steps you will take: Best Management Practices or BMPs shall be inspected and maintained during construction and removed within 30 days after the County Inspector or determines that the site is stabilized, provided that they may be removed when they are no longer needed. Element 12: Manage the Project The goal of this .element is to .ensure that the owner and those performing the site work comply with the SWPPP and properly coordinate to ensure that all BMPs are deployed at the proper time to achieve full compliance with county regulations throughout the project. The SWPPP will be implemented at all times. If applicable to the project, erosion control BMPs will be implemented in the following sequence: 1. Mark clearing limits 2. Install stabilized construction entrance 3. Install protection for existing drainage systems and permanent drain inlets 4. Establish staging areas for storage and handling polluted material and BMPs 5. Install sediment control BMPs 6. Grade and install stabilization measures for disturbed areas 7. Maintain BMPs until site stabilization, at which time they may be removed page 5 of 6 c,o Worksheet 131 Construction Protection: Medium and Large Projects �q o� (SWPPP: Stormwater Pollution Prevention Plan) IN G� Element 13: Protect Low Impact Development BMPs t1J /1A- The goal of this element is to protect permanent stormwater management BMPs from siltation and compaction during construction. The permanent stormwater management BMPs used for runoff from roofs and other hard surfaces include: full dispersion, roof downspout full infiltration or dispersion systems, perforated stubout connections, rain gardens, bioretention systems, permeable pavement, sheetflow dispersion, and concentrated flow dispersion. Methods that will be used to protect permanent stormwater management BMPs include: ❑ Sequencing the construction in a fashion to install these permanent BMPs at the latter part of the construction grading operations, Excluding equipment from the BMPs and the associated areas, ❑Using the erosion and sedimentation control BMPs listed below to protect facilities such as drywells, raingardens, permeable pavement, or bioretention from accumulating sediment during construction and before site restoration. If this option is selected check the BMPS you will use below: ❑ C102 Buffer Zone ❑ C233 Silt Fence C231 Brush Barrier Applicant or Representative Signature ❑ C103 High Visibiliti,- Fence ❑ C234 Vegetated Striv Other page 6 of 6 BMP C105. STABILIZED CONSTRUCTION ENTRANCE/EXIT POFC � �Sr Otdtiahs/ INSTALL DRIVEWAY CULVERT IF THERE / IS A ROADSIDE DITCH PRESENT A"A"OUARRY SPACES, A -INCH COURSE OF ASPHALT 1- N' TREATED BASE, OR USE —TING PAVEMENT GEOTEXTILE FAGRIC trMMl1NICYNFBB SYMBOL: i BMP C233. SILT FENCE j STEEL FENCE POSTS. I>W.�GS ORAET$PWOFYATlSEUSTTOAATTACHR EQUIVALENT N9RE FAl3DCT0POBTB. BURY BOTTMA OF FB.TER ADITEINAL Nd MNIMUM4"X6'T(�NCH POSTS TR"14Xf+L DEPTt1 MNpAiIAI POST SPACM MAY I BE INCRFASEDTOB' IFW FREBACSMIS FILTER FABRIC ht4TER1Al --7- USE➢ DAcuFTUTRom�H`mTH NAAYdE 901E OR�"-T.@' i4PSHEOGRAVEt NOTE. ANGLE SLT FENCE BACKUPTHE5LOPE AT THEM OF RUN. SYMBOL- INS— BMP C235. WATTLES , 1PL5� 6�NEAR. CRDANC MnTTER �` �\'�� ATWESI£IXSPI� GPTUR E6 B£HWID THE gOLL6 s IFESPACINGDEPtX1501L TY PE AN0 5LO?E STETEEPi$_SS I W.w II—IRSTALLATIONQ9uwH=5THEPIACSM AN. SECURE STANINOOFTHE ROLLINATRH3GL 3•v4"DEEP. tXI6IX1 l� DONTC4IR SECTION 2RUNOFF 1—NOT BE MIONED TDpUN UiDER OR AIUND MLL BMP C123. PLASTIC COVERING e eN.3waa} cLrwt xn3lacata�mlc sArmTr�AvamsrAxe3 aRUW Wgigt WWNI.84£• CCLYEY RllRD=FTOAMR'TIHFLOCATRNT � AeLA•N7c.£AnRnsnD RACEP Si0 t1AN1,LH EltrZT@IG inDY�KCN ceEPsIDT �1nAfnk Ty xmuu�nw ATTI�TOPCF iF!E mA4E• sDlt •A�Dn>_Twsu •Da. iSAWX xmMD �E mRaA£wn0w T�TN6VNs4Y® 001NEYR44YYfi0 3'NPI. AMY6A'�IOCATICN AN•AAiW6•,CF, �+, � JAAit£hiAR SYMBOL: TREE& VEGETATION PROTECTION �iREE mDTEcn�o MEm•�P� ���TOmAluli�t 4. i �NS�nOR �A w01•nmflnl.I1� off ac� RICH As �RDY�FA LAIN AoF HESEREE I a •A:PIW.i R,SEPNIIiq�l&OTS WAL� NWas ro� ulFarsrAtlili£'a'aBiESFA � � t ;pu�iPR��RNMI� 4F&ETAnIX4RROiEOnON I�R�unwlm Eo•YmEarc.nsV T. NN•eEcausmLCRXImaE BW T5.13- POST -CONSTRUCTION SOIL QUALITY AND DEPTH MINEENDOFMORELT./LLpRFil9DEii190vFD AMi A'OT DOVFRED WITFIPN IAIPERVIDBs aNRifFENO3lEAHHAIEDPEIITNESOLnTfEN•tAENT DETNL BELOW. s tfue.NiARBt308il1i••W nNDApTCropEREO WITHANINPEAVIODs3HRFpCE, WODgP•HATEDLi10A®TAWnGE FMNI.RY. tNI EN•BdEFA®ASAEiRUCTOWI RLIX3 LI.aPE.sEEnaaIRXrISIIVOw. ooemT REFETeERCE Aw uiFnnpTEPLa•IVlEW-r. —EST•AATEDFTHEYDwLffuFc0NPa3TRERUM -mEAcqu KIEDF COAPOST ➢WYLEOEfEWNNIIOMTHEg— OEFWRX%NS: • Nb3HEN�TeMo�M WIipr—S0ILEAUENo-TIFTHEYYAP.Ete1 AKV PLADEA fi6TGRO1Al•�TI•IanR•CEIT NSPETRMR tp E1HT•INCE I3E I VEJM•ETRA4G DRtMFAEtL3T0RAeE.ISALLWtEe N THEEEAREASBNlfi FNAL IR�BG1pR IABRTRESEA•FAS Aa pPo) AI THE P V.w NE W. • EO¢N®CLEMAi6ApAT•F.KTATEDDRGONP ASMRFAHDLAN03c P i�ALLTYD®PFRTN[SOLANENDAIEpi•ETAILANDTHESlBS0LMN5T •E aosVatn rHa•r1uREB�WEAsnlrncimevcLEAgmv ax•sRw•w.macFPluuO. A�•FAE11�8(cNwTHETPI�uF�VxttW�IsgtEO•IFMENisroapsE. tHaELaH� Lpul4Auu mLm•-_-_-_- Yv `' �`=t LraP00Rn Ilr SYMBOL:G—-.>n-- @ -.,p Site plan looking too crowded? Use the letters REFERENCE B1A- Construction BMP Options on this page as reference instead of drawing UTIUZAIION Or THIS TEMNATE IS (%'BONA'- IF ELECTED BY THE APPLICAINT FW UW, THE RMPS SHOYAi ON ERIS SNEGT MUST BE BUILT AS the BMP Be sure to indicate location, sizingIf SPED FIED HERE AND IN THE MOW RECWT DOE MANUAL IF ANY CONFLICT EXISTS, IRE DOE MANUAL WPERCEDES ^?9rry Complete construction stormwater control BMP details are found in Volume II of the DOE Stormwater Management Manual. applicable) use the proper symbol indicated on each BMP.