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Home My WebLink AboutBLD2021-00069-05- STORMWATERDEPARTMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street,Port Townsend,WA 98368 Tel:360.379.4450 I Fax:360.379.4451 Web:www.co.jefferson.wa.us/communitydevelopment E-mail:dcd@co.jcfferson.wa.us Scan the QR code to access the digital form STORMWATER CALCULATION WORKSHEET PARCEL#PROJECT/APPLICANT NAME: 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 require.d •.•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• PARCEL SIZE (I.E.,SITE) Size of parcel j ~}acres An acre contains 43,560 square feet.Multiply the acreage by this figure. Size of parcel in square feet '-I 8 J S-::L 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 __...:i_C>_"_~...!...._ Drainfield,septic tank,etc.0=__ Well.utilities.etc.0-='--_ sq/ft sqlft sq/ft Driveway,parking,roads,etc.Q__sq/ft Lawn,landscaping,etc.0 sq/ft Other compacted surface,etc.0 sq/ft Temporary construction area LO 1--j sq/ft Total Land Disturbance ID~sq/ft stormwater ca c worksheet QR code REV 5/31/2019 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 Yz acres or more of native vegetation to pasture? Circle:Yes 8 Indicate Total Volumes of Proposed: (Includes BMP T5.13 Fill Volume) FiII __~O...L-cut_l _(cu/yd) 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 in-filtration of stormwater. 7;),Structures (all roof area)sq/ft Sidewalks _____...•••..<--_sq/ft Patios _____O-"'-_sq/ft __..>e:'3,--,d--w.....;:...__sq/ft Driveway,parking,roads,etc O sq/ftosq/ft ---1l2!:1--Sq/ft Solid Decks (without infiltration below) Other Total New EXISTING _q i 5 sq/ft o sq/ft Structures (all roof area) Sidewalks Patios _____-'-_sq/ft ~';l 0 sq/ftSolidDecks (without infiltration below) Driveway,parking,roads,etc :3 3 d-3 sq/ft o _sq/ft 4 3 58 sq/ft Other Total Existing L-J4 L dTOTALNEW+TOTAL EXISTING*P ,sq/ft 'This amount will be used to check total lot coverage. DEVELOPMENTv.REDEVELOPMENT r •••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.~% The proposal is considered redevelopment Answer questions in Figure 2.4.2.Flow Chart for Redevelopment to determine project size (next page). 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 Storm water 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 A1 and Bl,a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference AlA and BIA for guidance).). ~"Large"projects-those that must meet all 9 Minimum Requirements-must submit Worksheet Al and Bl,a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference AlA and BIA 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 thet.fffy.ccttEedproperty.()II ~~~ll~-~--i 0 -~I ([NDOWNER OR AUTHORIZED REPRESENTATIVE SIGNATURE)(DATE) storrnwater ca c worksheet QR code REV 513112019 page 2 of 2 r Worksheet S Small Project Certification f '5 t~r''ftcation may on'y be used j'yo answer yes to al of the ques ions below (ircle yes ar ns}.Gtherwi!lE;a gY~mittai prel3ares l3y a liEenses anginasr may 13e reE1Hireci, Petmaheht and temporary draihage on site is deslgned to divert Storrnwater away from my ohslte s!"ptlt system or any neighboring onsite septic system, If located in a Seawater Intrusion Protection Zone (SIPZ),I am able to infiltrate stormwater onsite using a dfy- well or other method (full dispersion,downspout dispersiot!). 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 wiii create iess than 2,006 square feei: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 Storm water Pollution Prevention Fact Sheet and will implement Best Manage= ment Practices (BMP's)as applicable to my projest. ~- Appiicant Signature I By signing the small project certification,I as the applicant/owner attest that the information provided herein is true and correct to the best of my knowle~ge, ~~Q c.,.....}--').."?-d--(..• (LANDOWNER OR AUTHORIZED REPRESENTATIVE SIGNATURE)I (DATE) r