HomeMy WebLinkAbout05 Revised Site Plan and StormwaterDonna Frostholm
From: rrathvon@gmail.com
Sent: Wednesday, August 21, 2024 7:53 AM
To: Donna Frostholm
Cc: 'Terry McHugh'; 'Joey Pasquinelli'; 'Everett A. Sorensen'; Richard Rathvon
Subject: Rathvon - Site plan
Attachments: 2024-08-15_Rathvon Site Plans Rev 1_final.pdf, Stormwater calculations_24_0815
_signed.pdf
ALERT: BE CAUTIOUS This email originated outside the organization. Do not open attachments or click on links if you are
not expecting them.
Donna,
We retained Clark to mark the location on -site of the structure, septic field and well location.
Attached is the site plan showing the surveyed results.
In addition, the site plan shows:
1. A development summary;
2. Impervious coverage calculations; and
3. Limits of work / area of expected land disturbance.
Also attached are the current stormwater calculations.
Please let me know if you have any questions or require further information at this time.
Thank you.
Regards,
Rich
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DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Shcrid:ln StICCC, Port Townsend, \V \ 98368
1'cl: 360.3-9.44511 1 ax: 360.3-9,4431
PARCEL# 701164005
Scan the QR
code to access
the digital form
STORMWATER CALCULATION WORKSHEET
Revised August 15, 2024
PROJEcr APPLICANT NAME: Rathvon New Sinale Family Residence
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., SITE1
Size of parcel 5.47 acres An acre contains 43,560 square feet. Multiply the acreage by this figure.
Size of parcel in square feet 238,000 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, 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 cleared for:
Construction site for structures 6,600
Drainfield, septic tank, etc.
sq/ft
2,500 sq/ft
Well, utilities, etc. 500 sq/ft
Driveway, parking, roads, etc. 1,600 sgift
Lawn, landscaping, etc.
Other compacted surface, etc
750 sq/ft
U
sq/ft
Temporary construction area 1,000 sglft
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 �!c
Does the project convert 2 '/ acres or more of
native vegetation to pasture?
Circle: Yes 0
Indicate Total Volumes of Proposed:
(Includes BMP T5.13 Fill Volume)
Total Land Disturbance 12,950 sq/ft cut <400 Fill <400 (cuiyd)
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.
stormwater talc worksheet OR code — REV- 2/1/2019 page 1 of 2
119iRMWATER CALCULATIONS — IMPERVIdll SURFACE
NEW
Structures (all roof area) 3,676 ggift
Sidewalks
Patios
148
sglft
0 sgift
Solid Decks 60 sg/ft
(without infiltration below)
Driveway, parking, roads, etc 1,304 sq/ft
Other 0 sq/ft
Total New 5,188 split
EXISTING
Structures (all roof area)
0
gp/ft
Sidewalks
Q
sq/ft
Patios
0
sq/ft
Solid Decks
0
sq/ft
(without infiltration below)
Driveway, parking, roads, etc
4,300
sq/ft
Other
0
cm/ir
Total Existing 4,300 sglft
TOTAL NEW +TOTAL EXISTING* 9,488 sglft "This amount will be used to check total lot coverage.
Divide the total existing
impervious surface above by the
size of the parcel and convert to
DEVELOPMENT v, REDEVELOPMENT
$rexistincii
es the site have > 35% or more ♦ ��`(
impervious surface?
a percentage. 1.8 %
1 yes
The proposal is considered redevelopment and
Answer questions in Figure 2.4.2.
The proposal is considered new development.
Answer questions in Figure 2.4.1
Refer to the applicable Flow Chart to determine the
Minimum Requirements.
Proponents of "small" projects must comply only with Minimum Requirement #2—Construction Stormwater Pollution Prevention.
Please submit the Small Project Certification. 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.
Proponents of "medium" projects —those that must meet only Minimum Requirements #1 through #5 must submit Worksheet Al
and B1, a stormwater site plan and a construction stormwater pollution prevention site plan (See Worksheet A2 and 132 for
guidance).
"Large" projects —those that must meet all 9 Minimum Requirements— must submit Worksheet Al and 131, a stormwater site plan
and a construction stormwater pollution prevention site plan (See Worksheet A2 and B2 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 the affected
property.
&dLo�
(LANDOWNER OR AUTHORIZED REPRESENTATNE SIGNATURE
FOR OFFICE USE ONLY
SMALL MEDIUM_ LARGE
(DATE)
stormwater talc woresheet QR code — REV, 211)2019 page 2 of 2