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Home My WebLink AboutMLA15-00075 - FPA15-00002 Stormwater Calculation Worksheetk�ggON Co � G 9 1 �5'FIINOSO JEFFERSON COUNTY DEPARTMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street • Port Townsend • Washington 98368 360/379-4450 • 360/379-4451 Fax http://www.co.jefferson.wa.us/commdevelopment/ Stormwater Calculation Worksheet �CECC OMIE DEC - 3 2015 D L �I JEFFERSON COUNTY MLA# 15-00ans PROJECT/APPLICANT NAME: JAniltifu5ni-r 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 �;)-L33 acres q An acre contains 43,560 square feet. Multiply the acreage by this figure. Size of parcel in square feet 12 Ischt 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 on plant species, other than noxious weeds, that are indigenous to the coastal region of the Pacific Northwest and 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, Answer the following two questions related to excavated, and/or compacted for proposed development conversion of native vegetation: project. Include in this calculation the area to be cleared for: Does the project convert % acres or more of Construction site for structures sq/ft native vegetation to lawn or landscaped areas? Drainfield, septic tank, etc. sq/ft Circle: Yes No Well, utilities, etc. sq/ft Does the project Convert 2 %acres or more of native vegetation to pasture? Driveway, parking, roads, etc. sq/ft Circle: Yes No Lawn, landscaping, etc. Sc At Other compacted surface, etc. sglft Indicate Total Volumes of Proposed: Total Land Disturbance �� aD0 — sq/R Cuter- Fill �_ (cu/yd) [over] sinrtvele-1cworksMH13-s92cii-REV 91912010 Impervious surface is a hard surface that either prevents or retards the entry of water into the soil mantle 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. The DEVELOPMENT V. REDEVELOPMENT Divide the total existing impervious surface above by the size of the parcel and convert to a percentage: 0 . % Does the site have 35% or more of existing impervious surface? Circle: Yes No FURTHER INSTRUCTIONS: If the answer is yes, the proposal is considered redevelopment and the attached Figure 2 should be used to determine the applicable Minimum Requirements. If the answer is no, the proposal is considered new development and the attached Figure 1 should be used. At this juncture, the applicant should refer to the applicable Flow Chart to determine the Minimum Requirements for stormwater management. DC staff will help verify the classification of the project and the application requirements. For proponents of 'small' projects who must comply only with Minimum Requirement #2—Construction Stormwater Pollution Prevention—an additional submittal is not required. 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 (SWPP) Best Management Practices (BMPs) Packet. Proponents of "medium" projects—those that must meet only Minimum Requirements #1 through #5 --and for 'large' projects—those that must meet all 10 Minimum Requirements—are required to submit a Stormwater Site Plan. DCD has prepared a submittal template of a Stormwater Site Plan, principally for rural residential projects. Complete the template in the Stormwater Site Plan Instructions and Submittal Template or prepare a Stormwater Site Plan using the step-by-step guidance in the Stormwater Management Manual. 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 pseperiv. (BATE)' Plan: s0lmwa�er Calc wodseeel Rev492010—REV 9192010 STORMWATER CALULATIONS — IMPERVIOUS SURFACE 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, mads, etc sq/ft Other sq/ft Other sgttt Total New (� q/ft Total Existing _ �� sq/ry TOTAL NEW+ TOTAL EXISTING' n sq/ft 'This amount will be used Ry STAFF to check total lot coverage. following questions will help determine whether the proposed project is considered development or redevelopment. DEVELOPMENT V. REDEVELOPMENT Divide the total existing impervious surface above by the size of the parcel and convert to a percentage: 0 . % Does the site have 35% or more of existing impervious surface? Circle: Yes No FURTHER INSTRUCTIONS: If the answer is yes, the proposal is considered redevelopment and the attached Figure 2 should be used to determine the applicable Minimum Requirements. If the answer is no, the proposal is considered new development and the attached Figure 1 should be used. At this juncture, the applicant should refer to the applicable Flow Chart to determine the Minimum Requirements for stormwater management. DC staff will help verify the classification of the project and the application requirements. For proponents of 'small' projects who must comply only with Minimum Requirement #2—Construction Stormwater Pollution Prevention—an additional submittal is not required. 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 (SWPP) Best Management Practices (BMPs) Packet. Proponents of "medium" projects—those that must meet only Minimum Requirements #1 through #5 --and for 'large' projects—those that must meet all 10 Minimum Requirements—are required to submit a Stormwater Site Plan. DCD has prepared a submittal template of a Stormwater Site Plan, principally for rural residential projects. Complete the template in the Stormwater Site Plan Instructions and Submittal Template or prepare a Stormwater Site Plan using the step-by-step guidance in the Stormwater Management Manual. 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 pseperiv. (BATE)' Plan: s0lmwa�er Calc wodseeel Rev492010—REV 9192010