HomeMy WebLinkAboutBLD2015-00150 - 05 STORMWATER 1—s-ON C � E 06 JEFFERSON COUNTY -ti � + DEPARTMENT OF COMMUNITY DEVELOPMENT Li;
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. 621 Sheridan Street • Port Townsend • Washington 98368
360/379-4450 . 360/379-4451 Fax 1 0
87NG http://www.co.jefferson.wa.us/commdevelopment/
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Stormwater Calculation Worksheet
MLA# (n � PROJECT/APPLICANT NAME: i=,' -
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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 information will also be helpful for completing a Stormwater Site Plan, if required.
PARCEL SIZE (I.E., SITE)
Size of parcel ?,-- acres An acre contains 43,560 square feet. Multiply the acreage by this figure.
Size of parcel in square feet .?-=l..27;% 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 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 ^, `r'' e sq/ft native vegetation to lawn or landscaped areas?
•
Drainfield, septic tank, etc. sq/ft Circle: Yes No
Well, utilities, etc. :' sq/ft Does the project convert 21/2 acres or more of
native vegetation to pasture?
Driveway, parking, roads, etc. D sq/ft
Circle: Yes No
Lawn, landscaping,, etc. -0 sq/ft
Other compacted surface, etc. cr I p sq/ft Indicate Total Volumes of Proposed:
Total Land Disturbance �__ _sq/ft Cut Fill `t (cu/yd)
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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 CALULATIONS–IMPERVIOUS SURFACE
NEW EXISTING
Structures (all roof area) sq/ft Structures(all roof area) / ; Y ,,:) sq/ft
Sidewalks Al/A sq/ft Sidewalks r' sq/ft
Patios t,-'/Id sq/ft Patios "'/A sq/ft
Solid Decks Win sq/ft Solid Decks ^x/11 sq/ft
(without infiltration below) (without infiltration below)
Driveway, parking, roads, etc ``'//a sq/ft Driveway, parking, roads, etc
sq/ft
Other N /A sq/ft Other N/FI sq/ft
Total New • sq/ft Total Existing / " sq/ft
TOTAL NEW+TOTAL EXISTING' `!, sq/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: _0
Does the site have 35%or more of existing impervious surface? Circle: Yes No
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
F;edui:i.ntcnts- -are required tc subni'it a Stomnvater Site Plan. DOD has prepared a submittal template of a Stormwater Site Plan,
�i;wiHuiy tai rural residential ..,unplate in the Stormwater Situ Flan Instructions and Submittal Template or
prepare a Stormwater Site Plan using the step-by-step guidance in the Storm water Management Manual.
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.
//41/l 4'(..�-��ylu U'� Z_Le 6v "icy / / 0'
(LANDOWNER OR AUTHORIZED REPRESENTATIVE SIGNATURE) ./ (DATE)
FOR OFFICE USE ONLY-
.
SMALL ' MEDIUM LARGE REDEVELOPMENT' Stormwater Site Plan.. -Yes No
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621 Sheridan Street • Port Townsend • Washington 98368 3 0
Sys gyp' 360/379-4450 • 360/379-4451 Fax
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FIINO http://www.co.jefferson.wa.us/commdevelopment/
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STORMWATER SITE PLAN SUBMITTAL TEM '- c „lit- DEVELOPMENT
MLA# 'L ` PROJECT/APPLICANT NAME: 2' 3,JC TO s 1 (glPrt tyvC Padt,ciii,5, 1,t.C
Please answer all of the following questions to the best of your ability. Where the question calls for depiction on a site map, the
applicant may choose to either incorporate the elements into the general plot plan for the Master Land Use Application or to submit a
separate stormwater site plan map.
Project Overview
1. Describe the proposed developed conditions of the site. Indicate position and relative size of proposed improvements on the
1 1 site map.
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Existing Conditions Summary
2. Describe the existing topography. Indicate contours on the site map.
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3. Describe the existing vegetation. Indicate native vegetation areas on the site map.
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4. Describe the existing soils. Indicate soil type on the site map.
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5. Describe the existing site hydrology(i.e., drainage; behavior of water on the site--above, below, and on the ground). Indicate
existing stormwater drainage to and from the site on the site map. Depict separate drainage basins on the site map, if
applicable, and indicate acreage of each.
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6. Describe any excess levels of noise generated by the proposed use or activit APPROVED
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7. Describe significant geographic features and critical areas (i.e., environmentally sensitive areas such as wetlands, streams,
steep slopes, etc.)on the site. Indicate location on the site map.
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8. Describe the general vicinity of the site, including adjacent land uses and structures, utilities, roads, and sensitive/critical areas
(streams,wetlands, lakes, steep slopes, etc.).
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Permanent Stormwater Control Plan
This portion of the Stormwater Site Plan consists of the selection and installation of the appropriate stormwater control BMPs
and facilities to remain in place after construction of the project is completed.
"Medium" size projects are required to have the totals calculated of all impervious surfaces, pollution-generating impervious
surfaces, and pollution-generating pervious surfaces to verify that the thresholds for treatment facilities and flow control
facilities are not exceeded.
g. Describe the developed site hydrology, as proposed. Indicate whether stormwater will be fully dispersed (i.e., per BMP T5.30
in the Manual) or, if not, what types of stormwater flow control will be utilized for the site or specific threshold discharge areas
within the site. Locate these facilities on the site plan and differentiate proposed facilities from existing facilities.
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10. If the project requires the use of stormwater treatment facilities, describe the types of stormwater treatment facilities proposed
for use on the site. Locate these facilities on the site plan and differentiate proposed facilities from existing facilities. [This is
normally for"large"projects or'projects that involve the potential for dispersion of contaminants]
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11. Describe the performance goals and standards applicable to the project.
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12. Describe the flow control system.
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13. Describe the water quality system.
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14. Describe the conveyance system analysis and design.
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15. Describe the source of fill material, physical characteristics of fill material, and deposition of excess material.
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16. Proposed methods of placement and compaction consistent with the applicable standards on Appendix Chapter 33 of the
Uniform Building Code.
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17. Describe the proposed surfacing material.
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18. Describe methods for restoration of the site.
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19. An Operation and Maintenance Manual is required for each flow control and treatment facility. [This is normally required for
"large" projects only and only those for which facilities are required to control flow or treat runoff.] If included, list the Manuals
here.
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20. List here and include any special reports or studies conducted to prepare the Stormwater Site Plan.
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21. List other necessary permits and approvals as required by other regulatory agencies. If those permits or approvals include
conditions that affect the drainage plan or contain more restrictive drainage-related requirements, describe those conditions or
restrictions here. !!��
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CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN(SWPPP)
The Construction SWPPP addresses sediment and erosion control during construction. The BMPs indicated by the applicant in the
template that follows must be installed on the ground during all construction phases of the project. The proponent is responsible for
preventing sediment and erosion impacts to environmentally sensitive areas and off-site areas. Consult the Construction Stormwater
Pollution Prevention (SWPP) Best Management Practices (BMPs) Packet for guidance, particularly with rural residential
development.
SECTION I—CONSTRUCTION SWPPP NARRATIVE
1. Construction Stormwater Pollution Plan Elements. Describe how each of the Construction SWPPP elements has been or
will be addressed. Identify the type and location of BMPs used to satisfy the required element. If an element is not applicable
to the proposal,justify in writing. Descriptions of the 12 Elements are found at section 2.5.2 of the Manual (beginning on page
2-15).
12 Required Elements—Construction SWPPP
1. Mark Clearing Limits.
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2. Establish Construction Access.
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3. Control Flow Rates.
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4. Install Sediment Controls.
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5. Stabilize Soils. /
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6. Protect Slopes.
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7. Protect Drain Inlets.
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12 Required Elements—Construction SWPPP(continued)
8. Stabilize Channels and Outlets.
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9. Control Pollutants.
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10. Control De-Watering(the act of pumping groundwater or stormwater away from an active construction site).
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11. Maintain Best Management Practices(BMPs).
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12. Manage the Project.
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2. Adjacent Areas.
a. Description of the adjacent areas that may be affected by site disturbance (e.g., streams, lakes, wetlands, residential
areas, roads).
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b. Description of the downstream drainage path leading from the site to the receiving body of water(minimum distance of 400
yards).
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3. Environmentally Sensitive Areas.
a. Description of environmentally sensitive areas that are on or adjacent to the site.
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b. Description of special requirements for working in or near environmentally sensitive areas.
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4. Erosion Problem Areas. Description of potential erosion problems on site in the context of the characteristics of the on-site
soils(e.g., erodibility, settleability, permeability, depth, texture, soil structure).
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5. Construction Phasing.
a. Construction sequence
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b. Construction phasing (if proposed)
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6. Construction Schedule. Wet season is October 1 through April 30(page 2-21 of the Manual).
Provide a proposed construction schedule.
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II. Wet Season Construction Activities.
a. Proposed wet season construction activities.
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b. Proposed wet season construction activities for environmentally sensitive areas.
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7. Financial/Ownership Responsibilities.
a. Identify the property owner responsible for the initiation of bonds and/or other financial securities.
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b. Describe bonds and/or other evidence of financial responsibility for liability associated with erosion and sedimentation
impacts.
8. Engineering Calculations. Provide Design Calculations on a separate sheet for the following, if applicable.
a. Sediment Pondsffraps. 4/h,,.-e. deo
b. Diversions. "4"eA 7A.,7
c. Waterways. ')r e /f/if/.+n'--od i)/9 7'/
d. Runoff/Stormwater Detentiorr6eleulatyensr- o ss e,�,,�� v 4( a/,„/„,77 fri 1
stomlwalor site plan temptate.doc-rev.10/12/2003
• •
SECTION II—EROSION AND SEDIMENT CONTROL PLAN
Sediment and erosion control measures may be depicted on the master land use application plot plan,a stormwater site plan, and/or a
separate Construction SWPPP site plan. This is a checklist to ensure that the following are depicted on a site plan:
1. General.
a. Vicinity Map
b. Jefferson County Approval Block
c. Erosion and Sediment Control Notes
2. Site Plan.
a. Legal description of subject property.
b. North arrow.
c. Indicate boundaries of existing vegetation(e.g.,tree lines, pasture areas, etc.).
d. Identify and label areas of potential erosion problems.
e. Identify FEMA base flood boundaries and Shoreline Management boundaries(if applicable).
f. Show existing and proposed contours.
g. Indicate drainage basins and direction of flow for individual drainage areas.
h. Label final grade contours and identify developed condition drainage basins.
i. Delineate areas that are to be cleared and graded.
j. Show all cut and fill slopes indicating top and bottom of slope catch lines.
3. Conveyance Systems.
a. Designate locations for swales, interceptor trenches, or ditches.
b. Show all temporary and permanent drainage pipes, ditches, or cut-off trenches required for erosion&sediment control.
c. Provide minimum slope and cover for all temporary pipes or call out pipe inverts.
d. Shows grades,dimensions, and direction of flow in all ditches, swales, culverts and pipes.
e. Provide details for bypassing off-site runoff around disturbed areas.
f. Indicate locations and outlets of any dewatering systems.
4. Location of Detention Best Management Practices(BMPs). Identify location of detention BMPs.
5. Erosion and Sediment Control Facilities.
a. Show the locations of sediment trap(s), pond(s), pipes and structures.
b. Dimension pond berm widths and inside and outside pond slopes.
c. Indicate the trap/pond storage required and the depth, length,and width dimensions.
d. Provide typical section views through pond and outlet structure.
e. Provide typical details of gravel cone and standpipe, and/or other filtering devices.
f. Detail stabilization techniques for outlet/inlet.
g. Detail control/restrictor device location and details.
h. Specify mulch and/or recommended cover of berms and slopes.
i. Provide rock specifications and detail for rock check dam(s), if applicable.
j. Specify spacing for rock check dams as required.
k. Provide front and side sections of typical rock check darns.
I. Indicate the locations and provide details and specifications for silt fabric.
m. Locate the construction entrance and provide a detail.
6. Detailed Drawings. Any structural practices used that are not referenced in the Ecology Manual should be explained and
illustrated with detailed drawings.
7. Other Pollutant BMPs. Indicate on the site plan the locations of BMPs to be used for the control of pollutants other than
sediment(e.g.,concrete wash water).
8. Monitoring Locations. Indicate on the site plan the water quality sampling locations to be used for monitoring water quality on
the construction site. Sampling stations should be located upstream and downstream of the project site.
slorrnwater silo plan lemplalo.aoe—rev.10/1212003 11
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• •
Stormwater Site Plan Changes
If the designer wishes to make changes or revisions to the originally approved Stormwater Site Plan, the proposed revisions shall be
submitted to DCD prior to construction. The submittal shall include substitute pages that include all proposed changes, revised
drawings showing any structural changes, and any other supporting information that explains and supports the reason for the change.
Final Corrected Plan Submittal
If the project included construction of conveyance systems, treatment facilities, flow control facilities, or structural source control BMPs
(not standard on-site stormwater management BMPs), the applicant shall submit a final corrected plan ("as-builts") when the project is
completed. These should be engineering drawings (stamped by a licensed civil engineer) that accurately represent the project as
constructed.
APPLICANT SIGNATURE
By signing the Construction SWPPP 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.
/s /eivozikiT/d/✓j L t e b //, ✓lhgi��U�_. U// �,l?-ic
(LANDOWNER OR AUTHORIZED REPRESENTATIVE SIG TORE) l (DATE)
THIS SPACE MAY BE USED FOR ADDITIONAL NOTES, IF NEEDED:
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