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Home My WebLink About05- StormwaterDEPARTMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street, Port Townsend, V`A 98368 Tel: 360.379.4450 1 Fax: 360.379.4451 Web: v-\vw.co.jefferson.%vq.us/comn-iLini development E-mail: dcd ct,co.icfferson.�va.us � . C a Scan the QR x'�``,I code to access pj�,, the digital form STORMWATER CALCULATION WORKSHEET PARCEL# O 2— 5 (D 1,21 PROJECT/APPLICANTNAME: !D�tkrzSC., 't- 0-1 LC�—, G ro e- t' 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 requi PARCEL SIZE (I.E., SITE) Size of parcel • iv' acres An acre contains 43,560 square feet. Multiply the acreage by this figure. Size of parcel in square feet 81, 6 l% t'61 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 5 (J" sq/ft Drainfield, septic tank, etc. rl�J� sq/ft Well, utilities, etc. sq/ft Driveway, parking, roads, etc. 49 sq/ft Lawn, landscaping, etc. sq/ft Other compacted surface, etc. Jor sq/ft Temporary construction area sq/ft Total Land Disturbance `�? 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 Does the project convert 2'Y2 acres or more of native vegetation to pasture? Circle: Yes No Indicate Total Volumes of Proposed: (Includes BMP T5.13 Fill Volume) Cut 4�r Fill _ (cu/yd) stormwater calc worksheet OR 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 Structures (all roof area) / sq/ft Sidewalks sq/ft Patios Solid Decks (without infiltration below) ff sq/ft 0 sq/ft Driveway, parking, roads, etc J(X sq/ft Other 3 Z (> sq/ft Total New .5 f3 8 sq/ft TOTAL NEW + TOTAL EXISTING" 8 l 1 % sq/ft EXISTING Structures (all roof area) 2yJ 66 1" sq/ft Sidewalks A01 sq/ft Patios e sq/ft Solid Decks sq/ft (without infiltration below) Driveway, parking, roads, etc Other /b 160 sq/ft Total Existing 0 '% 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 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 B1A 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 B1A 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 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. //-" t R -?0 (LANDOWNER OR AUTHORIZED REPRESENTATIVE SIGNATURE) (DATE) stormwater calc worksheet QR code — REV. 5/31 /2019 page 2 of 2 Worksheet S Small Project Certification This certification may only be used if you answer yes to all of the questions below (circle yes or no) . Otherwise, a submittal prepared by a licensed engineer may be required. Fes I F o Mes Fno] es Fn es Fol If located in a Seawater Intrusion Protection Zone (SIPZ), I am able to infiltrate stormwater onsite using a dry - well or other method (full dispersion, downspout dispersion). My project will not discharge stormwater runoff into a critical area (including but not limited to: geohazard area or its 30-foot buffer, wetland or Fish and Wildlife Habitat Conservation Area) My proposal is a small project, which means it will create less than 2,000 square feet of new, replaced, or new plus replaced impervious surface area, and has less than 7,000 square feet of land disturbing activities as defined on the Stormwater Calculation Worksheet. I understand that my project must comply with Minimum Requirement #2 in the Department of Ecology Stormwater Management Manual as amended. I have read the Construction Stormwater Pollution Prevention Fact Sheet and will implement Best Manage- ment Practices (BMP's) as applicable to my project. Applicant Signature By signing the small project of my knowledge. 1 I as the applicant/owner attest that the information provided herein is true and correct to the best !(/.- g/ o a -15( 1 (LANDOWNER OR AUTHORIZED REPRESENTATIVE SIGNATURE) I fnnTF1