HomeMy WebLinkAboutBLD2022-00246 - 05 Stormwater or Approved StormwaterDEPARTMENT OF COMMUNITY DEYBLOPMENT
621 Sheridan Sueet, Port Torvnsencl, V'A 98368
Tel 360.379.M50 | Fa* 360.379.4451
Web: vrrw.co.icffcrson.ua.us /communitydcvelopment
E-mail: dcd@.co. jrefferson.ura.us
STORM$TATER CALCUI-ATION WORKSHEET
PARCEL #PROI ECI/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
required.
PARCEL SIZE (I.E.. SITE)
Size of p"r."l 1[ r"r"" An acre contains 43,560 square feet. Multiply the acreage by this figure.
size of parcet in square fe"t 26571 '60 sq/ft
Land-disturbing dctivity 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'
Nativevegetation 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.
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:
Well, utilities, etc.
sq/ft
sq/ft
sq/ft
LAND DISTURBING ACTIVITY. CONVERSION OF NATIVE VEGETATION. AND VOLUME OF CUT/FILL
Construction site for
"1ru"1r.rr""
204
Answer the following two questions related to
conversion of native vegetation:
Does the project convert To acres or more of
native vegetation to lawn or landscaped areas?
Circle: Yes No
Does the project convert 2 y" acIes or more of
native vegetation to pasture?
Circle: Yes No
lndicate Total Volumes of Proposed:
(lncludeslll"i':r,; " )
Drainfield, septic tank, etc.
Driveway, parking, roads, etc..sq/ft
Lawn, landscaping, etc.
Other compacted surface, etc.
Temporary construction area
Total Land Disturbance 0 Fill_ (cu/yd)
sq/ft
sq/ft
sq/ft
sq/ft
Scan the OR
code to access
the digitalform
stomwater €lcworksheet QR @de - REV.5l31l2o19 page 1 of 2
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RECEIVED BY DCD 4/28/22
Worksheet S
Small Project Certifi cation
This certification may only be used if you answer yes to all of the questions below (circle yes or no) . Otherwise, a submittal
prepared by a licensed engineer may be required.
lf located in a Seawater lntrusion Protection Zone (SIPZ), I am able to infiltrate stormwater onsite using a dry-
well or other method (full dispersion, downspout dispersion).
My project will not discharge stormwater runoff into a critical area (including but not limited to: geohazard
area or its 3Q-foot buffer, wetland or Fish and Wildlife Habitat Conservation Area)
My proposal is a small project, which means it will create less than 2,000 square feet 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.
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Permanent and temporary drainage on site is designed to divert Stormwater away from my onsite septic
system or any neighboring onsite septic system,
I understand that my project must comply with Minimum Requirement #2 in the most current edition of the Department of
Ecology Stormwater Management Manual. I have read the Construction Stormwater Pollution Prevention Fact Sheet and will
implement Best Manage-ment Practices (BMP's) as applicable to my project.
Applicant Signature
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 knowledge.
RECEIVED BY DCD 4/28/22
STORMWATER CALCULATIONS . IMPERVIOUS SURFACE
lmperuious 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.
NEW
Structures (all roof area)
Sidewalks
Patios
Solid Decks
204
EXISTING
Structures (all roof area)
Sidewalks
Patios
Solid Decks
(without infiltration below)
Driveway, parking, roads, etc
Other
.sq/ft .sq/ft
.sq/ft
-sq/ft
.sq/ft
(without infi ltraiion below)
Driveway, parking, roads, etc sq/ft
sq/ft
Total New 204
TOTAL NEW + TOTAL EXISTING* 204 ,qffi
.sq/ft
_sq/ft
.sq/ft
.sq/ft
Total Existing
*This amount will be used to check total lot coverage.
.sq/ft
DEVELOPMENT v. REDEVELOPMENT
Divide the total existins
impervious surface above by the
size of the parcel and convert to
a percentage. .O\ %
F
The proposal is considered redevelopment Answer
questions in Figure 2,4,2. Flow Chart for
Redevelopment 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
erosionandpreventsedimentandotherpollutantsfromleavingthesiteduringtheconstructionphaseoftheproject. Pickupthe
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 81, a stormwater site plan and a construction stormwater pollution prevention site plan (See Reference A1A and B1A for
guidance).).
* "Large" projects-those that must meet all 9 Minimum Requirements- must submit Worksheet A1 and 81, a stormwater site plan
and a construction stormwater pollution prevention site plan (See Reference A1A and 8L4 for guidance). Large projects also may
require engineering. See Worksheet L to determine additional large project requirements.
->Does the site have > 35o/o or more
existino impervious surface?
+E
APPIICANT SIGNATURE By signing the Stormwater Calculation Worksheet, I as the applicant/owner attest that the information provided herein
of my knowledge. I also certify that this application is being made with the full knowledge and consent of all owners
(oare)
stormwater calcworksheet QR @de - REV.513'll2O19 page 2 ol 2
Other
RECEIVED BY DCD 4/28/22