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Enclosure 4 "StormwaterPlan"
to Marrowstone Island Permit
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JEFFERSON COUNTY
DEPARTMENT OF COMMUNITY DEVELOPMENT
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621 Sheridan Street. Port Townsend, Washington 98368L
360/379-4450' 360/379-4451 Fax
http://www.co.jefferson.wa.us/commdevelopment/
Stormwater Calculation Worksheet
MLA#
PROJECT/APPLICANT NAME:
uJ
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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.
Size of parcel
acres
PARCEL SIZE (I,E.. SITE) eA't\m: If-L:o\lf)
An acre contains 43,560 square feet. Multiply the acreage by this figure.
Size of parcel in square feet
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 couid have been expected to naturally occur on the site. Examples include species such as
Douglas fir, westem 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
~
<75
Drainfield, septic tank, etc.
Well, UtilitieS, eE--ii1/ t15 ."loa
I
Driveway, parking, etc.
<$
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Lawn, landscaping, etc.
Other compacted surface, etc.
Total Land Disturbance
[over]
sq/ft
sq/ft
sq/ft
sq/ft
sq/ft
sq/ft
sqlft
Answer the following two questions related to
conversion of native vegetation:
Does the oroiect convert 3h ~cres or more of
-I--~"-----------"--- .
native vegetation to lawn or landscaped areas?
Circle:
C9
Yes
Does the project convert 2 % acres or more of
native vegetation to pasture?
Circle:
s
Yes
Indicate Total Volumes of Proposed:
Cut
r e\li'LN 'm
(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 quanti!i~or at an increased rate of flow
from the flow present under natural conditions prior to development. Common impervious surfacesiinciLide,'lmt"fife.1lQ1jimited to roof
tops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, grave.~roadS' packed earthen~
and oiled, macadam or other surfaces which similarly impede the natural infiitration of stormwater. .i ... .. \ f
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sqlft '- -,,-..~ J
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Structures (all roof area) L
~
STORMWATER CALULATIONS -IMPERVIOUS SURFACE I
EXISTING (
Structures (all roof area)
rp
C/>
<:%
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yr'
rp
C/
Sidewalks
Patios
Solid Decks
(without infiltration below)
Driveway
Other
Total New
TOTAL NEW + TOTAL EXISTING*
sq/ft
Sidewalks
sq/ft Patios sqlft
sq/ft Solid Decks sqlft
(without infiltration below)
sq/ft Driveway sq/ft
sqlft Other sq/ft
sqlft Total Existing sqlft
sqlft
*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.
DEVELOPMENTv.REDEVELOPMENT
Circle:
-A%
~
Divide the total existina impervious surface above by the size of the parcel and convert to a percentage:
Does the site have 35% or more of existina impervious surface?
Yes
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" piOjects who must comply only with Minimum Requirement#2-Gonstruction Stormwater Pollution
Preventio~n 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,
principallyfor rural residential projects. Gompletethe template in th~~orl11Y!~!t!~t~J)J.lrllf1!;tl'lJ~i90$_amtSubmittal Template or
--- mUprepare-a Sformwater Sife Planusi"ng the step-6y-step- guidance -in the Stormwater Management Manual.
APPLICANT SIGNATURE
,
By signing the Stormwater Calculation Worksheet, I as the applicanVowner attest that the information provided herein is true and
correct to the best of my owledge. I also certify that this application is being made with the full knowledge and consent of all
owners of the affected e '
RESENTATIVE SIGNATURE)
,
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(DATE)
stormwater calc worksheet - REV. 10/112003
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JEFFERSON COUNTY j!
DEPARTMENT OF COMMUNITY DEVELOPMEN .
621 Sheridan Street. Port Townsend, Washington 98:ka.:
360/379-4450 . 360/379-4451 Fax
http://www.co.jefferson.wa.us/commdevelopmenU
STORMWATERSITE PLAN SUBMITTAL TEMPLATE
MLA#
PROJECT/APPLICANT NAME:
Y00* \ ot ue{\eJ't.'j,o..'V\ Co.:..vv4tl
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.
1.
ize of proposed improvements on the
, V .
4,
5.
the proposed use or activit :
'{\;!S{VL
slormwater site plan template. doc - rev. 10/1212003
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7. Describe significant geographic features and critical areas (i.e., environmentally sensitivefareaskuc:ha~wetlands,streams,
steep slopes, etc.) on the site, Indicate location on the site map, '
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Permanent Stormwater Control Plan t-J / A-
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, N-D \.II\^-~ \J W'^-'~ ~\/~ C1.-U-4 UJ ""U 'f Q..~ ~'VIrt ~ (VU .
9, 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,
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.]
11. Describe the performance goals and standards applicable to the project,
12, Describe the flow control system,
stormwater site plan template.doc- rev. 1011212003
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13. Describe the water quality system,
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14. Describe the conveyance system analysis and design,
15. Describe the source of fill material, physical characteristics of fill material, and deposition of excess material.
.
16, Proposed methods of placement and compaction consistent with the applicable standards on Appendix Chapter 33 of the
Uniform Building Code.
17. Describe the proposed surfacing material.
18. Describe methods for restoration of the site.
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,
20. List here and include any special reports or studies conducted to prepare the Stormwater Site Plan,
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 STORMWA TER POLLUTION PREVENTION PLAN
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 t~ 12 Elements are found at section 2.5,2 of the Manual (beginning on page
2-15), L$~ a1:h:~ SWt? pp )
12 Required Elements - Construction SWPPP
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2, Establish Constructioo Access,
f . lUl V-Jo./..JL. w vU ~ dvvte VlA ~ ()\ I~. *\ C' (l f) s.. r \.N vU ~
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>. 3, Control Flow Rat~s. - ~ cue. -fC,.t..J V-CWl/t. ..Q...CU~ (/Vt- Is~. vJolLlL Vi.! ",(A I-zc
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4. Install Sediment Controls,
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6. Protect Slopes,
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1......):J~'LILCl\I\ o-f.t,UAS.\~ of tocL&ov vv\. d~rt:A.l 'or LU \I~O(~~ ~~I-UUl/l
7, Protect Drain Inlets.
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stormwater site plan template.doc- rev. 10/1212003
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12 Required Elements - Construction SWPPP (continued)
8, Stabilize Channels and Outlets,
~~ ~~~~l~ ~~~s,:tn VUP~
(!CI.l- I. .1.' . 6 C ,. UJ ,.' dC.J1S
9, Control Pollut~nts, , ~
If' e.5;-nLc cf fW' {11 tV:t-1A::tc:: IVVt
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10. Control De-Watering (the act of pumping groundwater or stormwater away from an active construction site),
_ '~ bV=~ ~ ~: 'm ~~\f* Wo ~0U-Wj~~
o..L)(~i<i..ue+ Or t- '" V\JR.QA,t.' '~,b-Qc ,- ScJyt
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11. Ma;n&;n Best anagement Pcacti"", (BM~,). . :\d . .~
(~\ <;;. L T""P ~ W"U 'vl' if ~"^ ~~ -\crY e..,vr, iV'uu
12, Manage the ~roject... .r,. IL
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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),
~<;.-kw ~" r \L\. \.;l~ Ut-N\ (,~{.-
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b.~i~~~~e :wn~m :na~om 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,
C~~\s~r~l~~~~ ~~ -:AI~~
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b, Description of special requirements for working in or near environmentally sen~iti"e areas, . ..., ..,. .. .' . . '
,^-Jo ~AI~-t1 ~\-~H?('~~~~k ~'L ~"A<;\:tl~a-M,'\..Lt L~.
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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),
t IUL ~ .
5, Construction Phasing.
a, Cons. truction sequence,
\)~ &~ (o..VfQJi~ c...Q..u\l\A.eq ~ W'T ,t-_(fW ),) {~~ \..)o.5iUJ-.\~ ~ii
(Iv~ u~ cktr"l;t.) ~1IL'-.~ ~
b, Construction phasing (if proposed)
~~.,. ') CI'V\ ~V\.IIA ~\ lruxt ~(UL \-u '~ .-\.0 v'\A t III tVlA-( t €.
7 of- . ~ w...>.'UL VIA ~ ~ v\A. d '
6, Construction Schedule. Wet season is October 1 through April 30 (page 2-21 of the Manual).
I. Provide a proposed construction schedule,
Ilk_<tz\l.( uJc:iliA ~ WckYi u.~fU'v~JU5 ~cly() -~
II. Wet Season Construction Activities,
a, Proposed wet season construction activities,
~liUJl w-a.tJA ~ j' w.::f-1/t ~..f.e...n u.lIAu4 .
b, Proposed wet season construction activities for environmentally sensitive areas,
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7, Financial/Ownership Responsibilities,
a. Identify the property own~r responsi~e for the initiation of bonds and/or other financial securities.
~O J) 4< l ci: \.J~~ ~I\I\. Le~
b, Describe bonds and/or other evidence of financial responsibility for liability associated with erosion and sedimentation
impacts, ,
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8, Engineering Calculations. Provide Design Calculations on a separate sheet for the following, if applicable,
a, Sediment PondslTraps, :l
b, Diversions. Y'"
c, Waterways, c/J
d, Runoff/Stormwater Detention Calculations
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SECTION 11- EROSION AND SEDIMENT CONTROL PLAN I i___. .. .. ....... '
Sediment and erosion control measures may be depicted on the master land use application ~Iqt plan, ~ ~tdrmwatef site pll3n, and/or
separate Construction SWPPP site plan. This is a checklist to ensure that the following are depicted on a site plan:
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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 controllrestrictor 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 dams,
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.
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Stormwater Site Plan Changes . ... I
If the designer wishes to make changes or revisions to the originally approved Stormwater Site Plan, the proposed revisionsshaj 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.
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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 affect pr p rty,
J-'K A--yvu.2 :2<JeJ S'
(DATE)
THIS SPACE MAY BE USED FOR ADDITIONAL NOTES, IF NEEDED:
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Notes: is required all
42 inches of over
wate:lines. ditch line to
If possIble ral
gentle slope
42"min 'FTHE mrCll
~ FORAT'l1'fEB01TOMt
EI"< TIONINBACKO'
WKfER LINE WfLLB A Y SECTION
TYPI AL ROADW
Route Ditch Detail
e MP
to
Typical
MP
Indian Island
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d water hnes
Propose
OTECTION PLAN
__m___~ R POLLUTION PR
STORM~~i~NE ISLAND
~:~~~ION PROJECT
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Enclosure 4 (Stormwater Plan) for the Marrowstone Island Permit I I - 2005 I. i! I
~~nstru~~:~;~~rc~t:C;;:~ ~~~::~~~~7:::~n requiretto obtain~~~:~G}:r I
2. Narrative Requirement.
.
e-.
a. This project is to extend the Quimper Water System onto Marrowstone Islnad. It
will include the installation of approximately 120,000 LF of 8, 6, 4, and 2 inch PVC C900 water
lines with appurtenances on Marrowstone Island. The water lines will be installed within the
existing R/W's, and utility easements. In general, the water lines will be installed on the
backside or in existing road ditches, and in some cases along the road shoulders. No new
impervious surfaces will be created as a result of this project. Other than the water line, a few
fire hydrants, and individual meters there are no other major construction requirements. The
PUD will be using directional boring in a few locations, for example, crossing the causeway
between Marrowstone and Indian Island. The project will be done in phases, the first being on
the west side of the Island in the State R/W and connecting county and private roads. We will
schedule this portion of the project to avoid summer traffic. Because of the linear nature of this
project the contractor will be working in a linear phased fashion, only disturbing the land needed
to lay the water line (approximately 1.5' wide x 4' deep x perhaps 1,000 feet a day).
b. The PUD will use the following strategies and BMP's to meet the goal of
controlling erosion and sedimentation:
1) Taking advantage of a geographic area that receives less than 18 inches of
precipitation a year (rain shadow) and therefore having limited run-off events.
2) By requiring the Contractor to clean up the site on a daily basis using
BMPs, and thus limiting the opportunities for erosion and sedimentation. Per our SWPPP
exposed and unworked soil will be covered within 2 days between October 1 and March 31 and
within 7 days between Aprill and September 30.
3) By negotiating with the State and County to position the water line where
it will have the least impact on the drainage patterns. For example, placing pipes in ditches that
both agencies already disturb the soils as part of their routine maintenance.
4) By negotiating with the State and County to minimize the ground
disturbing activities. Try to stay in ditches designed for run-off. Limit the number of trees,
scrubs, etc that have to be removed.
5) By requiring compaction and reseeding of ditches once the water line has
been installed, and within the timelines outlined in para b.2) above.
6) By requiring straw or hay bales or fiber fence in ditches and drainage
ways down slope from areas ofland disturbing activity to filter runoff before it leaves the project
site or enters water bodies.
7) By requiring the contractor to follow the Storm Water Pollution
-'0 ~ Prevention Plan (enclosed)
~ \ ~ 8) By paying particular attention to the contractors staging area practices
(Q '0
Vt~ ~ Q c. Maintenance will consist of the PUD insuring the contractor follows the SWPPP.
'^ ~icular attention to BMP's will occur during rain storm events.
t\1
~1'" d. Sequence of events. Contractor's generally dig a ditch approximately 50' (1.5 x
4 x 50); soil is placed offto the side of the ditch. Ifnecessary, fill material (sand) is brought in
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to bed the water line. The water line is then installed. Soil is added and compacted until it ,
reaches the original level. As the water line is being laid, the lead back hoe continues to dig for ...J.i
the ditch. At the end of the day the line is completely covered, any excess soil is removed.--.~
Depending on the contractor he will either install the water meters as he goes along or will come
back at a later time. Generally, there will be a crew offlaggers to maintain traffic. Depending
on the weather the contractor will hydro-seed the disturbed area at various times during
construction.
4. Enclosed is the project map. Should you require a larger scale please let me know.
County provided the maps showing various hazard areas. The water lines are not affected by any
of those areas. The only area of concern would be the wetlands. In all cases where there is a
possible wet land the PUD is using BMPs to negate any negative affect. For example,
positioning the water lines in the road shoulder (possible use of ditch witch) and using
directional boring.
5. Enclosed are drawing that will be included in the bid package.
6. Enclosed is the SWPPP.
7. POC this memo is Jim Parker, PE.
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Stormwater Pollution Prevention Plan (SW/PPP)
for Marrowstone Island Water Main Extension
1. Purpose. To serve as the SWPPP for the Marrowstone Island Water Main Extension
Construction Project.
2. Background.
a. As a result of seawater intrusion problems and the lack of potable ground water
on Marrowstone Island, Jefferson County, PUD# 1 of Jefferson County was petitioned to purvey
water to the Island residents.
b. The project involves the installation of approximately 120,000 feet of 8,6,4, and
2 inch C900 PVC water line on Marrowstone Island. The project includes service meters,
several fire hydrants, and other various water system accoutrements.
c. Water lines will be installed in rights of way and easements on State Route 116,
numerous Jefferson County roads, and on private roads. In most cases water lines will be
positioned within the ditch lines which are maintained on a regular basis by both State and
County road crews.
d. The PUD has been working with the State Department of Transportation and
County Public Works to position the water lines where they will have the least effect on the
roads. In many cases this conflicts with our efforts to have the minimal impact on existing
vegetation within the right of way (eg. Trees, shrubs, flowerbeds, driveways, etc.)
e. Marrowstone Island is located in the Olympic Rain Shadow and as such receives
less than 18 inches a year of precipitation.
3. General Description of project.
This project, although quite large in scale is limited in scope. Basically, the PUD will be
installing water lines (8 inches or less), generally behind or in the ditch line, in some cases in the
shoulders, and where possible on the far side of the ditch line. Positioning of the water lines
will be IA W the controlling agencies desires. In general, we try to cooperate to minimize
disruption to existing environment.
Along SRl16, State DOT has allowed us to position our water lines on the back side or in
the ditch, as necessary. They have requested that we decrease the depth of the existing ditch line
to better match the roadway. This would provide a safer road for both vehicles and pedestrians.
In general all crossings of the State and County roads will be encased. See drawings for details.
The County PW's has been working with the PUD to meet their requirements to have the
water line as far as possible from the roadway, while acknowledging that the existing terrain
restricts our ability to position the water lines. The County has agreed to review on a case by
case basis the requirement to bore across all roads.
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4. Objectives of this Plan
a. To implement 'Best Management Practices (BMPs) to minitnize erosiona.tid
sediments from rainfall runoff at construction sites, and to identify, reduce, eliminate or prevent
the pollution of stormwater.
b. To prevent violations of surface water quality, ground water quality, or sediment
management standards.
c. To prevent, during the construction phase, adverse water quality impacts
including impacts on beneficial uses of the receiving water by controlling peak rates and
volumes of stormwater runoff at the permittee's outfalls and downstream of the outfalls.
d. To eliminate any possible discharges of unpermitted process wastewater,
domestic wastewater, illicit discharges, and non-contract cooling water to stormwater drainage
systems and surface waters of the state.
5. General Requirements.
The PUD will be the permittee and responsible for the implementation of the SWPPP.
The SWPPP will be provided to the contractor as part of the bid documents, this will allow the
contractor sufficient time to plan and the implementation the provisions of this SWPPP.
The PUD will designate the Notice Oflntent (NOl), a contact person, who will be
available 24 hours a day to respond to emergencies, and to inquires or directives from Ecology.
This person will be the PUD project inspector. The contact person shall have authority over the
SWPPP implementation. While the PUD is ultimately responsible for proper activities under the
general permit and for proper implementation of the SWPPP, both the owner and lor operator of
the site may be held liable for any permit violations.
The contractor will retain the SWPPP on-site or within reasonable access to the site and
make it available upon request to Ecology and local governmental agencies with jurisdiction.
The public may obtain a copy ofthe PUD's SWPPP by request from Jefferson County, Ecology
or the PUD.
The PUD will retain the SWPPP and copies of the Notice oflntent, inspection reports and
all other reports required by this permit for, at least three years after the date of the final
stabilization of the construction site. The PUD shall make these documents available upon
request by Ecology and by the local government agencies with jurisdiction.
Reports on incidents, such as discharge of spills and other noncompliance notification,
shall be included in the records.
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b. Jefferson County or DOE may require SWPPP and BMP modifications if
compliance with standards is not being achieved.
c. The PUD will modify the SWPPP whenever there is a change in design,
construction, operation, or maintenance of any BMP which cause(s) the SWPPP to be less
effective in controlling the pollutants.
d. Whenever a self-inspection reveals that the description of pollutant sources or the
BMPs identified in the SWPPP are inadequate due to the actual discharge of or potential to
discharge a significant amount of any pollutant, the SWPPP shall be modified as appropriate.
The PUD shall provide for implementation of any modifications to the SWPPP in a timely
manner.,
7. Applicability of Current and Future Editions of the Stormwater Management
Manual for the Puget Sound Basin (SWMM):
BMPs were selected from the most recent published edition of the SWMM, August 2001,
that has been available for at least 120 days prior to the BMP selection, or other equivalent
manuals available at the time of the BMP selection or when the selection of additional BMPs is
necessary. If new BMPs are required they will be implemented per DOE and Jefferson County
directives.
8. EROSION AND SEDIMENT CONTROL PLAN:
a. Stabilization Practices:
1)
Stabilization practices will include: Attempting to place the new water line
in areas that will result in the least amount of disturbance to the natural
fauna (in the ditch or on the shoulder of the roads), by using mulch,
permanent seeding, and geo-textiles; by advocating the retention of existing
vegetative buffer strip to DOT and Jefferson County; and by attempting to
protect of existing trees, preservation of mature vegetation.
A record of the dates when major grading activities occur, when
construction activities temporarily or permanently cease on a portion of the
site, and when stabilization measures are initiated.
Stabilization measures shall be initiated as soon as practicable in portions
of the site where construction activities have temporarily or permanently
ceased.
The following conditions will require application ofBMPs:
i) All exposed and unworked soils shall be stabilized by suitable and
timely application of BMPs.
ii) Existing vegetation should be preserved where attainable. In the
field, mark areas which are not to be disturbed, including setbacks,
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sensitive/critical areas and their buffers, trees anddraina.ge COillses ..
shall be marked or flagged on site befor~ construction activities ~4"
initiated. These areas should not be harmed when measuresUrfderthe~-'-_!
SWPPP and/or construction activities are undertaken.
iii) Cut and fill slopes shall be designed and constructed in a manner that
will minimize erosion. Slopes shall be stabilized in accordance with
requirement a. above.
iv) Stabilization adequate to prevent erosion' of outlets and adjacent
stream banks shall be provided at the outlets of all conveyance
systems.
v) All storm drain inlets made operable during construction shall be
properly maintained.
vi) Wherever construction vehicle access routes intersect paved roads,
provisions must be made to minimize the transport of sediment onto
the paved road. If sediment is transported onto a road surface, the
roads adjacent to the construction site shall be cleaned on a regular
basis. Street washing shall only be allowed after other methods to
prevent the transport or to remove the sediments are unsuccessful.
b. Structural Practices:
There will be a very minimal requirements for any structural BMP's. However,
the contractor should implement structural BMPs to divert flows from exposed
soils, store flows, or otherwise limit runoff and discharge of pollutants from
exposed areas of the site to the degree attainable. Such practices include slit
fences, earth dikes, drainage swales, sediment traps, check dams, subsurface
drains, pipe slope drains, level spreaders, storm drain inlet protection, rock outlet
protection, reinforced soil retaining systems, gabions, and sediment basins.
Structural practices should be placed on upland soils to the degree attainable. The
installation of these devices may be subject to Section 404 of the Federal Clean
Water Act. The following requirements will be satisfied:
i) Prior to leaving the site, storm water runoff shall pass through a
sediment pond or sediment trap, or other appropriate BMPs.
ii) Properties adjacent to the project site shall be protected from
sediment deposition.
iii) Sediment ponds and traps, perimeter dikes, sediment barriers, and
other BMPs intended to trap sediment on-site shall be constructed
as a first step in grading. These BMPs shall be functional before
land disturbing activities take place. Earthen structures used for
sediment control such as dams, dikes, and diversions shall be
stabilized as soon as possible
iv) Properties and waterways downstream from the construction site
shall be protected from erosion due to increases in volume,
velocity, and peak flow of storm water runoff from the project site.
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v) All temporary erosion and sediment contr1: ~lyLS]ralI.~_C?2005. i q
removed within 30 days after final site stabilization isaahiev~d or.... ..... '.... .' .It
after the temporary BMPs are no longer needed. Trapped sediment..:. H...,_
shall be removed or stabilized on-site. Disturbed soil areas
resulting from removal shall be permanently stabilized.
c. Selection of Stabilization and Structural BMPs:
The PUD has selected BMPs described in Volume II, August 2001, edition
of Ecology's Stormwater Management Manual (SWMM)
d. Inspection and Maintenance
All BMPs will be inspected, maintained, and repaired as needed to assure
continued performance of their intended function. All on-site erosion and
sediment control measures will be inspected at least once every seven days
and within 24 hours after any storm event of greater than 0.5 inches of rain
per 24 hour period.
e. Record Keeping
Reports summarizing the scope of inspections, the personnel conducting the
inspection, the date(s) of the inspection, major observations relating to the
implementation of the SWPPP, and actions taken as a result of these
inspections shall be prepared and retained as part of the SWPPP.
f. Compliance Reporting Requirement:
Compliance with the maintenance and schedule requirements of the
SWPPP and other schedule requirements of this permit constitutes
compliance with the reporting requirements of WAC 173-226-180.
g. Plans (drawings):
The Erosion and Sediment Control Plan consists of two parts: a narrative
and a set of site plans (drawings). The drawings are enclosed. Because of
the nature of the project and the scale plans simply identify locations of
water lines and examples of BMPs to be used.
2. Control of Pollutants Other Than Sediment on Construction Sites:
All pollutants other than sediment that occur on-site during construction shall
be handled and disposed of in a manner that does not cause contamination of
stormwater. Chapter II-3 of the SWMM can be referenced for guidance in
controlling other potential pollutants.
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The PUD is coordinating this application through the i,ieffer$on~Count)Cl>..ermit
Center. They will coordinate with all required agentie~. .. '.
5. Notice of Termination (NOT)
After the site has undergone final stabilization, and all storm water discharges from soil
disturbing activities have ceased, and all exposed soils have a permanent vegetative
cover, or equivalent permanent stabilization measure with prevent erosion, the PUD will
submit a Notice of Termination form. A Notice of Termination will end permit coverage
and the responsibility of the PUD. The PUD is responsible for submitting the termination
notice in order to end permit coverage. Unless the permit is terminated, Ecology will
continue to assess a fee for the permit.
6. Plan requirements to achieve the 12 Elements of a SWPPP.
Element Number 1: Mark Clearing Areas. Because we will be working within the
right of ways there will not be any need to mark areas. The water lines will be installed
within the existing ditch lines.
Element Number 2: Establish Construction Access. The contractor will be required to
follow the following rules for his staging areas:
Construction vehicle access and exit shall be limited to one rout if possible
Access point shall be stabilized with quarry spall or crushed rock to minimize
the tracking of sediment onto the public roads
Wheel was or tire bath should be located on-site, if applicable.
Public roads shall be cleaned thoroughly at the end of each day. Sediment shall
be removed from roads by shoveling or pickup sweeping and shall be
transported to a controlled sediment disposal area. Street washing will be
allowed only after sediment is removed in this manner.
Street wash wastewater shall be controlled by pumping back on-site, or
otherwise be prevented from discharging into systems tributary to state surface
waters.
Element Number 3: Control Flow Rates
Properties and waterways downstream from development sites shall be
protected from erosion due to increases in the volume, velocity, and peak flow
rate of the stormwater runoff from the project site, as required by local plan
I 0'(""', "-."",.E-"" approval authority.
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Element Number 4: Install Sediment Controls
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The dufflayer, native topsoil, and natural vegetation snall be retained in an..
undisturbed state to the maximum extent practicable.
Prior to leaving a construction site, or prior to discharge to an infiltration
facility, storm water runoff from disturbed areas shall pass through a sediment
pond or other appropriate sediment removal BMP. Runoff from fully stabilized
areas may be discharged without a sediment removal BMP
Sediment ponds, vegetated buffer strips, sediment barriers or filters, dikes, and
other BMPs intended to trap sediment on-site shall be constructed as needed or
directed by the PUD inspector.
Element Number 5: Stabilize Soils
All exposed and unworked soils shall be stabilized by application of effective
BMPs, that protect the soil from the erosion forces of raindrop impact and
flowing water, and wind erosion.
From October 1 through April 30, no soils shall remain exposed and unworked
for more than 2 days. From May 1 to September 30, no soils shall remain
exposed and unworked for more than 7 days. This condition applies to all soils,
whether at final grade or not. These time limits may be adjusted by the local
permitting authority if it can be shown that the average time between storm
events justifies a different standard.
Applicable practices include, but are not limited to, temporary and permanent
seeding, sodding, mulching, plastic covering, soil application of polyacrylamide
(PAM), early application of gravel base on areas to be paved, and dust control.
Soil stabilization measures selected should be appropriate for the time of year,
site conditions, estimated duration of use, and potential water quality impacts
that stabilization agents may have on downstream waters or ground water.
Soil stockpiles must be stabilized and protected with sediment trapping
measures.
Work on linear construction sites and activities, including right-of-way and
easement clearing, roadway development, pipelines, and trenching for
utilities, shall not exceed the capability of the individual contactor for his
portion of the project to install the bedding materials, roadbeds,
structures, pipelines, and/or utilities, and to re-stabilize the disturbed soils,
meeting the timing conditions listed above.
i.. or', .,.' r"lj:..l.~ment Number 6: Protect Slopes
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Consider soil type and its potential for erosion.
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Reduce the slope runoff waters from off-site with interceptors at top of slope.
Off-site stormwater should be handled separately from storm water generated
on the site. Diversion of off-site storm water around the site may be a viable
option. Diverted flows shall be redirected to the natural drainage location at or
before the property boundary.
Contain down slope collected flows in pipes, slope drains, or protected
channels.
Provide drainage to remove ground water intersecting the slope surface of
exposed soil areas.
Excavated material shall be placed on the uphill side of trenches, consistent
with safety and space considerations.
Check dams shall be placed at regular intervals within trenches that are cut
down a slope.
Stabilize soils on slopes, as specified in Element #5.
Element Number 7: Protect Drain Inlets
All storm drain inlets made operable during construction shall be protected so
that stormwater runoff shall not enter the conveyance system without first being
filtered or treated to remove sediment.
All approach roads shall be kept clean, and all sediment and street wash water
shall not be allowed to enter storm drains without prior and adequate treatment
is provided before the storm drain discharges to waters of the State.
Element Number 8: Stabilize Channels and Outlets
All temporary on-site conveyance channels shall be designed, constructed, and
stabilized to prevent erosion from the expected velocity of flow from a 2 year,
24-hour frequency storm for the expected development.
Stabilization, including armoring material, adequate to prevent erosion of
outlets, adjacent stream banks, slopes and downstream reaches shall be
provided at the outlets of all conveyance systems.
Element Number 9: Control Pollutants
All pollutants, including waste materials and demolition debris, that occur on-
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Cover, containment, and protection from vandalism sh~ll be provided for all
chemicals, liquid products, petroleum products, and non-inert wastes present on
the site L.
Maintenance and repair of heavy equipment and vehicles involving oil changes,
hydraulic system drain down, solvent and de-greasing cleaning operations, fuel
tank drain down and removal, and other activities which may result in discharge
or spillage of pollutants to the ground or into the stormwater runoff must be
conducted using spill prevention measures, such as drip pans. Contaminated
surfaces shall be cleaned immediately following any discharge or spill incident.
Emergency repairs may be preformed on-site using temporary plastic beneath
and, if raining, over the vehicle.
Wheel wash or tire bath wastewater, shall be discharged to a separate on-site
treatment system or to the sanitary sewer.
Application of agricultural chemicals, including fertilizers and pesticides, shall
be conducted in a manner and at application rates that will not result in loss of
chemical to stormwater runoff. Manufacturers' recommendations shall be
followed for application rates and procedures.
Management of pH-modifying sources shall prevent contamination of runoff
and stormwater collected on the site. These sources include, but are not limited
to, bulk cement, cement kiln dust, fly ash, new concrete washing and curing
waters, waste streams generated from concrete grinding and sawing, exposed
aggregate processes, and concrete pumping and mixer washout waters.
Element Number 10: Control De-Watering
All foundation, vault, and trench de-watering water, which have similar
characteristics to storm water runoff at the site, shall be discharged into a
controlled conveyance system, prior to discharge to a sediment trap or sediment
pond. Channels must be stabilized, as specified in Element #8.
Clean, non-turbid de-watering water, such as well-point ground water, can be
discharged to systems tributary to state surface waters, as specified in Element
#8, provided the de-watering flow does not cause erosion or flooding of the
receiving waters. These clean waters should not be routed through sediment
ponds with storm water.
HigWy turbid or otherwise contaminated de-watering water, such as from
construction equipment operation, clamshell digging, concrete pour, or work
inside a cofferdam, shall be handled separately from storm water at the site.
Other disposal options, depending on site constraints, may include: 1)
infiltration, 2) transport off-site in vehicle, such as a vacuum flush truck, for
# legal disposal in a manner that does not pollute state waters, 3) on-site treatment
Pao;'?~--. using c~emical tre~tment or other s.uit~ble treatme~t techn~logies, or 4) s~itary
v .'""_~~_ of.:Zt:l_ sewer dIscharge With local sewer dIstrIct approval If there IS no other optIOn,
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Element Number 11: Maintain BMPs
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All temporary and permanent erosion and sediment control BMPs shall be
maintained and repaired as needed to assure continued performance of their
intended function. All maintenance and repair shall be conducted in accordance
with BMPs.
Sediment control BMPs shall be inspected weekly, or after a runoff-producing
storm event during the dry season, and daily during the wet season.
All temporary erosion and sediment control BMPs shall be removed within 30
days after the final site stabilization is achieved or after the temporary BMPs
are no longer needed. Trapped sediment shall be removed or stabilized on site.
Disturbed soil areas resulting from removal of BMPs or vegetation shall be
permanently stabilized.
Element Number 12: Manage the Project
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Phasing of Construction - Developmental projects shall be phased where
feasible in order to prevent, to the maximum extent practicable, the transport of
sediment from the development site during construction. Re-vegetation of
exposed areas and maintenance of that vegetation shall be integral part of the
clearing activities for any phase.
Seasonal Work Limitations- From October 1 through April 30, clearing,
grading, and other soil disturbing activities shall only be permitted if shown to
the satisfaction ofthe local permitting authority that silt-laden runoff will be
prevented from leaving the construction site through a combination of the
following:
1. Site conditions including existing vegetative coverage, slope, soil type and
proximity to receiving water; and
2. Limitations on activities and the extent of disturbed areas; and
3. Proposed erosion and sediment control measures.
Based on the information provided, and/or local weather conditions, the local
permitting authority may expand or restrict the seasonal limitation on site
disturbance. If, during the course of the seasonal limitation period, silt-laden
runoff leaving the construction site causes a violation of the surface water
quality standard or if clearing a graphing limits or erosion and sediment control
measures shown in the approval plan are not maintained, the local permitting
authority shall take enforcement action, including, but not limited to a notice of
violation, administrative order, penalty or stop-work order.
The following activities are exempt from the seasonal clearing and grading
limitations:
1. Routine maintenance and necessary repair of erosion and sediment control
BMPs;
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2. Routine maintenance of public facilities or existing utility structures that
do not expose the soil or result in the removal of the vegetative cover to soil; ..._..
and
3. Activities where there is one hundred percent infiltration of surface water
runoff within the site in approved and installed erosion and sediment control
facilities.
Inspection and Monitoring - All BMPs shall be inspected, maintained, and
repaired as needed to assure continued performance of their intended function.
Maintenance of the Construction SWPPP - The Construction SWPPP shall be
retained on-site or within reasonable access to the site. The Construction
SWPPP shall be modified whenever there is a significant change in the design,
construction, operation, or maintenance of any BMP.
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STORMW A TER MANAGEMENT SAMPLES
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Figure II-S.lS Filter Fabric Fence Detail
Filt.r fabric mat.rial in continuoua roUa;
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