HomeMy WebLinkAboutMLA16-00035- FPA16-00001 Stormwater Calculation WorksheetgGN c \ i,, ��N �
DEPARTMENT OF COMMUNITY DEVELOI?M�1V"Y' ��' P MI`r=_,
4
611 ll dzn c1 0 I t\) 9N368
II3CO3-9,4450 1 1- 3f0.39JJ..1
ar I,-dopnca - 7 2016
1 wff
29`yHING"SG�
STORMWATER CALCULATION WORKSHEET - 100"EM
MU/i '6' oOO 3S PPOIER/P111UAMNPME: �Jr//,:x , /ClO (iV 9•
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 `J. 5 Z acres An acre contains 43,560 square feet. Multiply the acreage by this figure.
Sae of parcel in square feet .ZYO 1/9C sqt t
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 CUTIFILL
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 Geared for.
Construction site for structures 3�bDd sgtt
Drainfield, septic tank, etc.i/Ic%rvr)/r �tn.booe sq/ft
Well, utilities, etc. inCwi�V aGo d'✓ sq/ft
Driveway, parking, roads, etc. Drift s )ft
Lawn, landscaping, etc. J4GL,2&Z rbo✓e sq/ft
Other compacted surface, etc. sq/ft
Total Land Disturbance Y{%eDo sqm
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: No
Does the project convert 2 %acres or more of
native vegetation to pasture?
Circle: Yes N®
Indicate Total Volumes of Proposed:
Cut
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 star mwater.
::a"rmaum..orw�i-asv rwzauoia
NEW
Structures (all roof area)
Sidewalks
Patios
STORMWATER CALULATIONS - IMPE--RR�VIOUS SURFACE
U n kV0,Vn RfXISYING LS t,/rne
EI
sq/ft
Solid Decks
sq/ft
(without infiltration below)
sq/ft
Driveway, packing, roads, etc
sq/ft
Other
sq/ft
Total New sq/it
Structures (all mof area)
/it
Sidewalks
sq/ft
Patios
sq/ft
Solid Decks
sq/ft
(without infiltration below)
Driveway, parking, roads, etc
sq/ft
Other
/it
Total Existing
TOTAL NEW+ TOTAL EXISTING" 60 fit 'This amount wil be Used to cher, 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: _0_%
Does the site have 35% or mora of existing impervious surface? Circle: yes El No 0
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. DICE, 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 Pouution
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 115—and for large" projects—those that must meet all 30
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 Monual.
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
property.
n p-
�
NOOWNER 0
RAV1HO0.1Zm REPRESENTATIVE SIGNATURE) (OAiE)
Mmm'ale,wkwaFslreal-REV fW3WL010