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Home My WebLink AboutBLD2021-00050 - 05 STORMWATERDEPARTMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street, Port Townsend, WA 98368 Tel: 360.37g.4450 I Fax: 360379A451 Web: www.co.iefferson.wa.iis/communitydevelopment dcd(iiicojefferson.wa.tis PM" Scan the QR lkit,r,MLA code to access arga the digital form STORMWATER CALCULATION WORKSHEET PARCEL # 9co oc,qi 1:3S-- 0100911 PROJECT/APPLICANT NAME: )0(2C 17--re*,11 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 33 acres An acre contains 43,560 square feet. Multiply the acreage by this figure. Size of parcel in square feet MI SH. 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--%. sq/ft Drainfield, septic tank, etc. sq/ft 1,0o0 sq/ft sq/ft sq/ft sq/ft sq/ft sq/ft Well, utilities, etc. 4At Driveway, parking, roads, etc. too Lawn, landscaping, etc. Other compacted surface, etc. Temporary construction area 0 Total Land Disturbance Circle: Yes Does the project convert 2 1/2 acres or more of native vegetation to pasture? Circle: Yes Indicate Total Volumes of Proposed: (Includes Cut Av5 s Fill (cu/yd) 9SM•1021(..4 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? stormwater sale worksheet OR code — REV. 5/31/2019 page 1 of 2 Feb 01 2021 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. EXISTING sq/ft Structures (all roof area) sq/ft sq/ft Sidewalks sq/ft sq/ft Patios sq/ft sq/ft Solid Decks sq/ft (without infiltration below) sq/ft Driveway, parking, roads etc sq/ft sq/ft Other sq/ft sq/ft Total Existing sq/ft TOTAL NEW + TOTAL EXISTING* IPSO sq/ft This amount will be used to check total lot coverage. NEW Structures (all roof area) Sidewalks Patios Solid Decks (without infiltration below) Driveway, parking, roads, etc Other Total New 0 DEVELOPMENT v. REDEVELOPMENT Does the site have > 35% or more existina impervious surface? Divide the total existing impervious surface above by the size of the parcel and convert to a percentage. A- yes The proposal is considered redevelopment Answer questions in Figure 2.4.2. Flow Chart for Redevelopment to determine project size (next page). no The proposal is considered new development. Answer questions in Figure 2.4.1 Flow Chart for New Development 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 Bl, a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference AlA and BlA for guidance).). — "Large" projects—those that must meet all 9 Minimum Requirements— must submit Worksheet Al and Ell, a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference AlA and BlA 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 f ed property. of (LANDOWNER ORZJTHORIZED REPRESENTATIVE SIGNATURE) y 3/5„e stormwater carp worksheet OR code — REV, 5/31/2019 page 2 o12 300 Feb 01 2021