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Home My WebLink AboutBLD2018-00489 - 05 STORMWATERoo DEPARTMENT OF COMMI.INITY DEVELOPMENT 621 Sheridan Street, Port Townsend, WA 98368 T el: 360.37 9.4450 | Fax: 360.37 9.4451 Web: www.co. ieffeson.wa.us /communirvdevelooment E-rr,ail: dcd(d.co.i effetson.wa.us ST ORMWATER CALCUI-ATI ON Buor t:+o*b1 DETERMININ6 STORMWATER MANAGEMENT classify the proposal as "small," "medium," conjunction with a stand-alone stormwater ma application that involves stormwater review. req u ired. R E eu r R E M E N rs : r h i s st o r m w a t e r c a r c u r a t i o n{HF#ffisou @ur0[S gqArFI . o or "large." The size determines whether a Stormwater Site Plan is iefilt'dd in nagement permit application, building permit application, or other ldnd use approval The basic information will also be helpful for completing a Stormwater Site Plan, if OCI 2vu#eRor ecr/ecelt cnur ruau r : ,) PARCEL SIZE (I.E.. SITE) An acre contains 43,560 square feet. Multiply the acreage by this figure, sq/ft7Size of parcel in sq uarereet 9l'l,ZhL Size of parcel 0,1 ,O ,"r"" Lond-disturbing octfuity 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 vegetotian is vegetation comprised on plant species, other than ncxious 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 lmperuious surfoce 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 increasedrateofflowfromtheflowpresentundernatural conditionspriortodevelopment. Commonimpervioussurfacesinclude, 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 orothersurfaceswhich similarly impedethe natural infiltration of stormwater. LAND DISTURBING ACTIVITY. CONVERSION OF NATIVE VEGETATION. AND VOLUME OF CUT/FILL Fd ffitr (cu/yd) Well, utilities, etc. Construction site for structures Drainfield, septic tank, etc. Driveway, parking, roads, etc. Lawn, landscaping, etc. lndicate TotalVolumes of Pro sq/ft sq/ft sq/ft sq/ft sq/ft sq/ft Does the project convert lo acres or more of native vegetation to lawn or landscaped areas? Circle: Yes @ Does the project convert 2/. acres or more of native vegetation to pasture? Circle: Yes @ Calculate the total area to be cleared, graded, filled, excavated, and/or compacted for proposed development project. lnclude in this calculation the area to be cleared for: Answer the following two questions related to conversion of native vegetation: Other compacted surface, etc. Total Land Disturbance cut d Fiu-'-Z- stormwater calc worksheet - REV. 1012012014 I ,ffi sqn oo STORMWATER CALCULATIONS - IMPERVIOUS SURFACE TorAL NEW + TorAL ExrsflNc. 215,065 ,qnt---)- Total New Total Existing *This amount will be used to check total lot coverage. Other Al3 , 70{ so/n 4ao Driveway, parking, roaas, erc 177 - ZtF ,opDriveway, parking, roads, etc Other NEW Structures (all roof area) Sidewalks Patios Solid Decks (without infi ltration below) EXISTING Structures (all roof area) Sidewalks Patios Solid Decks (without infiltration below) .! The following questions will help determine whether the proposed project is considered development or redevelopment. FURTHER INSTRUCTIONS: lf the answer is yes, the proposal is considered redevelopment and the attached Figure 2 should be used to determine the applicable Minimum Requirements. lf 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. DCD 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 H2-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 Plevention (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 StormwateJ Site Plan, principally for rural residential projects. Complete the template in the Stormwater Site Plan lnstructions and Submittal Template or prepare a Stormwater Site Plan using the step-by-step guidance in the Stormwoter Monagement Manual. APPTICANT SIGNATURE Divide the total existinq impervious surface above by the size of the parcel and convert to a percentag ., A'V o1o Does the site have 35% or more of existinq impervlous surface? Circle: DEVELOPMENT v. REDEVELOPMENT Yes *"m By signing the Stormwater Calculation Worksheet, I as the applicant/owner attest that the information provided herein is true and correct to the knowledge. I also certify that this application is being made with the full knowledge and consent of all owners of the affected OR AUTHORIZED STGNATURE)(onre) -) <-. best of stormwater calc worksheet - REV. 1 0/2012014 lr.?40 so/ft 1., F7O sqft ' ,/ "qnZ "qtt 2 o o MLA #PROJECT/APPLICANT NAM E DEPARTMENT OF COMMUNITY DEVELO 621 Sheridan Street, Port Townsend, WA 98368 'I' el 360.37 9.4450 | Fax: 360.37 9.4451 Web: www.co. iefFerson.wa.us /communiwdeveloomen t E-mail: dcd@co.iefferson.wa.us **rrr'jpuo,STORMWATER CALCULATION WO 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. Land-disturbing octfuity is any activity that results in movement of earth, or a change in the existing soil cover (both vegetative and non-vegetative) and/ortheexistingsoil topography. Landdisturbingactivitiesinclude,butarenotlimitedtoclearing,grading,filling, excavation, and compaction associated with stabilization of structures and road construction. Native vegetotion 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. lmperuious 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 increasedrateofflowfromtheflowpresentundernatural conditionspriortodevelopment. Commonimpervioussurfacesinclude, 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. PARCEL SIZE (I.E.. SITE) An acre contains 43,560 square feet. Multiply the acreage by this figure. sq/ftSize of parcel in square feet Size of parcet A | ,O acres LAND DISTURBING ACTIVITY. CONVERSION OF NATIVE VEGETATION. AND VOLUME OF CUT/FILL Does the project convert lo acres or more of native vegetation to lawn or landscaped areas? Circle: Yes @ Does the project convert 2/, acres or more of native vegetation to pasture? Circle: Yes @ q d 6 a sq/ft sq/ft sq/ft sq/ft sq/fi sq/ft sq/ft Construction site for structures Driveway, parklng, roads, etc. Lawn, landscaping, etc. Drainfield, septic tank, etc. Well, utilities, etc. lndicate Total Volumes of Proposed: c,t )q Fll y' (cu/yd) Calculate the total area to be cleared, graded, filled, excavated, and/or compacted for proposed development project. lnclude in this calculation the area to be cleared for: Answer the following two questions related to conversion of native vegetation; Other compacted surface, etc. Total Land Disturbance stormwater calc worksheet - REV. 1012012014 ?2 2,7t8 414rzt' o o STORMWATER CALCULATIONS - IMPERVIOUS SURFACE Dnveway, parking, roaas,etc l27rZLl7 t 1x other 7 i,400 ,r,o rotarExistins 2,lVt -/0f sqntTotal New *This amount will be used to check total lot coverage.uTOTAL NEW + TOTAL EXISTING* 2 Driveway, parking, roads, etc Other NEW Structures (all roof area) Sidewalks Patios Solid Decks (without infl ltration below) EXISTING Structures (all roof area) Sidewalks Patios Solid Decks (without infi ltration below) ir The following questions will help determine whether the proposed project is considered development or redevelopment FURTHER INSTRUCTIONS: lf the answer is yes, the proposal is considered redevelopment and the attached Figure 2 should be used to determine the applicable Minimum Requirements. lf 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. DCD staff will help verify the classification of the project and the application requ irements. 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 lnstructions and Submittal Template or prepare a Stormwater Site Plan using the step-by-step guidance in the Stormwoter Manogement Manuol. APPL!CANT SIGNATURE 2 Divide the total gig!!1g impervious surface above by the size of the parcel and convert to a percentag ., A V X Does the site have 35% or more of q.jg[49 impervious surface? Circle: DEVELOPMENT v. REDEVELOPMENT Yes *rm By signing the Stormwater Calculation Worksheet, I as the applicant/owner attest that the information provided herein is true and correct to the knowledge. I also certify that this application is being made with the full knowledge and consent of all owners of the affected (uruoowruen on eurHoRtzED srelrlruRe)(onre) best of stormwater calc worksheet - REV 1012012014 L.?40 so/ft i ^ F7O sqtft ./ ,qn Z ,qtt