HomeMy WebLinkAboutBLD2017-00011 - 05 STORMWATER • I
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Tel:360.379.4450 Fu:360.379.4451'f►f �
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STORMWATER CALCULATION WORKSHEET
MLA# PROJECT/APPUCANT NAME: eti41 +•
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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 infomlation will also be helpful for completing a Stormwater Site Plan, if
required.
t� PARCEL SIZE[I.E..SITE)
Size of parcel I acres An acre contains 43,560 square feet. Multiply the acreage by this figure.
Size of parcel in square feet \c '2_615 •.2-09q/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 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?
Drainfieki,septic tank,etc.
sq/}t Circle: Yes
Well,utilities,etc. sq/ft Does the project convert 2 1/2 acres or more of
„y4 _ native vegetation to pasture?
Driveway,parking, roads,etc. sq/ft
Circle: YesNo
Lawn,landscaping,etc. sq/ft �-
Other compacted surface,etc sq/ft Indicate Total Volumes of Proposed:
Total Land Disturbance sgift Cut Fill (cu/yd)
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.
71ornM'a[er oak worksheet-REV.10292014 t
III •
STORMWATER CALULATIONS—IMPERVIOUS SURFACE
NEW EXISTING
Structures(all roof area) t . r . sg/ft Structures(all roof area) 2-7 6? 7 sq/ft
Sidewalks — sq/ft Sidewalks 2C-)0 stint
Patios sq/ft Patios
.j sq/ft
Solid Decks _sq/ft Solid Decks 2 c/o sq/ft
(without infiltration below) (without infiltration below)
Driveway,parking,roads,etc sq/ft Driveway,parking,roads,etc \ 2'0 r sq/ft
Othersq/ft Other sclift
Total New 117W---s Total Existing ,;S---‘V 7 sgift
TOTAL NEW+TOTAL EXISTING* ',5.-- 7-7 , eq/ft `This amount will be used to check total lot coverage.
The 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: l 1
Does the site have 35%or more of existing impervious surface? Circle: Yes [] Nor2
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. 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 #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 Worksj et,I as the applicant/owner attest that the information provided herein is true and correct to the
best of my knowledge. I also certify tha is application is being made with the full knowledge and consent of all owners of the affected
property. /
(LAN.: OR All ZE9EPR, ATIVE SIGNATURE) (DATE) `
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stormwater caic worksheet-REV.10/2012014 �l" 2
• •/31103
DEPARTMENT OF COMMUNITY DEVELOPMENT
ADMINISTRATIVE
WATER CONSERVATION MEASURES LIST
To Promote Aquifer Recharge
and Prevent Seawater Intrusion
1. Roof and other intercepted precipitation shall be routed to on-site detention ponds
and/or other approved means and allowed to be released to the soil slowly.
r
ring
2 Water and Bard ns. Unles catchmenttorm water and s water hascatchments
been treated to meet drinking
lawns and gardens.
water standards,there shall be no cross connections allowed between the potable
supply and impounded water.
3. Ground water withdrawn from each property should not exceed a rate of three (3)
gallons per minute.
4. Install water-conserving fixtures such as low flow toilets,faucets and shower
restrictors and other water saving plumbing fixtures.
5_ Landscaping should include xeriscaping and native vegetation with minimal amounts
of irrigation.
6. Use drip irrigation, soakerto
eplantstlshrroot
utbsand trees.
r
igation.
7_ Use water basin techniques
8. Routinely water deeply and less frequently.
9. Weed control is an important part of water conservation.
10.For your landscaping select drought tolerant plants, shrubs and trees stay away from
heavy water consumers.
11.Limit the amount of irrigated lawn.
12.Mulch your garden as well as isolated plants,trees and shrubs.
13.Use shade and windbreaks to assist in water conservation.
14.Use low flow water closets, showerheads and water conserving dish and clothes
washers.
15. Use rainwater catchment systems that corral rainwater from manmade surfaces and
into storage.
16. Install water-conserving devices
pumlume ped fromlets all exempt plpbellg fixtures.n u .
1 . Only 400 gallons perday orless should be
Seawater Intrusion Protection Zones(SIPZ).
18.Water softeners that contribute salt to groundwater through infiltration should not be
used in SIPZ.
19. Hose bibs (outdoor spigots)for outdoor water use should not be used in SIPZ.
[end]
PLEASE NOTE:THIS LIST IS A WORK IN
MADE AT TIME.RUSE CURRENT LIS ADDITIONS ST
Standard Conditions for ResidentialTevelopment in Jefferson County S
1. LIGHTING: Lighting fixtures shall be designed and hooded to prevent the light source from being directly
visible from outside the boundaries of the property. The intensity or brightness of all lighting, during
construction and after project completion shall not adversely affect the use of surrounding properties or
adjoining rights-of-way.
Exterior lighting for residential uses shall not exceed twenty feet (20') in height from the finished grade,
excepting when such lighting is an integral part of a building or structure. Ground level lighting is
encouraged.
2. BUILDING HEIGHT: The building height is not to exceed 35 feet.
3. OUTDOOR STORAGE: Outdoor residential storage shall be maintained in an orderly manner and shall
create no fire, safety, health or sanitary hazard.
4. UNLICENSED VEHICLES: Not more than 2 unlicensed vehicles shall be stored on any lot unless totally
screened from view of neighboring dwellings and rights-of-way. Such screening shall meet all applicable
performance and development standards specific to the district in which the storage is kept, and shall be in
keeping with the character of the area. Screening shall meet the requirements of Chapter 18.30 JCC.
Outdoor storage of 3 or more junk motor vehicles is prohibited except in those districts where specified as
an automobile wrecking yard or junk(or salvage) yard and allowed as a permitted use in Table 3-1 or
Chapter 18.18 JCC, and such storage shall meet the requirements of JCC 18.20.100,Automobile wrecking
yards and junk(or salvage) yards. In no case, shall any such junk motor vehicles be stored in a critical
area.
5. PARKING: A minimum of two (2) on-site parking spaces shall be provided for the single family residence.
6. This permit has been reviewed consistent with JCC 18.40.130& 140. Notice: this permit does not excuse
the applicant from complying with other local, state and federal ordinances, regulations or statues,
applicable to the proposed development, but consistent with RCW 90.58. Future development beyond
that specified in this permit shall require further review. .
7. BMPs: The project shall adhere to the Best Management Practices (BMPs) to control stormwater, erosion
and sediment during construction. BMPs shall address permanent measures to stabilize soil exposed
during construction, and in the design and operation of stormwater and drainage control systems.
8. NOTICE: This permit does not excuse the proponent from complying with other local, state, and federal
ordinances, regulations, or statutes applicable to the proposed development, but consistent with RCW
90.58.
Development pursuant to this permit shall be undertaken subject to the applicable policies and
performance standards of the Jefferson County Shoreline Management Master Program and the Jefferson
County Unified Development Code.
If during excavation or development of the site an area of potential archaeological significance is
uncovered, all activity in the immediate area shall be halted, and the Administrator shall be notified at once.
The Federal Endangered Species Act rules to protect threatened Chinook and Summer-run Chum salmon
became effective on January 8, 2001. Bull trout have been listed as threatened since early 2000. Under
the ESA, any person may bring lawsuit against any individual or agency that"takes" listed species (defined
as causing harm, harassing, or damaging habitat for the listed species). In addition, the National Marine
2013-03-07_SFR_StdConditions 3/7/2013 1
k.
110
Fisheries Service can levy penalties. Portions of Jefferson County, including marine waters,are included
as "critical habitat"for a listed species. Development of property along any marine shoreline; freshwater
shoreline,
or floodplains could harm habitat if protective measures are not taken. To minimize the potential to
damage habitat, all property owners developing adjacent to marine shoreline, freshwater shoreline, or
floodplains are advised to do the following:
Ail development activities should avoid unstable slopes, wetlands, and forested areas near surface
waters
Remove minimal vegetation for site development, especially large trees
Allow trees that have fallen into surface waters to remain there
Infiltrate stormwater from buildings and driveways onsite through drywells rather than discharging
directly into surface waters or roadside ditches
The Federal Bald and Golden Eagle Protection Act requires landowners within 660 feet (1/8th of a mile) of
an eagle nest to consult with the US Fish and Wildlife Service. This Eagle Act prohibits anyone from
"taking" bald eagles. This federal law defines the term "take"and describes the possible legal
consequences when a"take" occurs. Among other actions, "take" includes a disturbance of bald eagles or
their habitat. Under federal law a permit may still be required for activities that impact bald eagles or their
habitat. Contact the US Fish and Wildlife Service (http://www.fws.gov/pacific/eagle/)to learn more about
how this law affects your project.
Any individual, group, or agency can bring suit for a listed species"taking", even if you are in compliance
with Jefferson County development codes. The risk of a lawsuit against you can be reduced by consulting
with a professional fisheries habitat biologist, and following the recommendations for site development
provided by the biologist. For more information, contact the National Marine Fisheries Service in Seattle,
or the U.S. Fish and Wildlife Service.
2013-09-06 SFR_StdConditions 9/6/2013 2