HomeMy WebLinkAbout701311021 Stormwater Mgmt
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APPROVED
STORMWATER PLAN
STRATUM GROUP
P.O. Box 2546, Bellingham, W A 98227
Phone (360) 714-9409
MAY 2 c 2009
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February 26, 2009
I'
1,
JEFFERSON CO
-: -C;JlII!P'J\()pi
,.. $IGNATtJRB:
Allan Herold
26020 SE 154th Street
Issaquah, W A 98027
Re: Stormwater Plan and Geotechnical Review
Parcel 701311021, East Quilcene Road
Jefferson County, W A
Dear Mr. Herold:
I have reviewed the proposed development plans for your property, reviewed the geotcechnical
reports for the site and reviewed and added information for the stormwater submittal to Jefferson
County. The proposed development can fully disperse stormwater consistent with the Ecology
(2005) BMP T5.30 with sheet flow dispersion from the driveway area consistent with Ecology
(2005) BMP T5.12 and infiltration trenches for roof run off consistent with Ecology (2005) BMP
T5.10. Stormwater management in this manner is consistent with the Ecology (2005) stormwater
manual for Western Washington and is consistent with the geotechnical reports previously
prepared for the site and is consistent with my own assessment of geologic conditions at the site.
Setbacks and Slope Stability
I reviewed the NTI (1993) and NT! (2002) reports regarding geology conditions at the site and I
visited the site and inspected the geology conditions at the site. Conditions I observed at the site
are generally consistent with the observations by NTI and I concur with the recommendations
made by NT!.
The initial geotechnical report NTI (1993) for the site recommended permanent structures should
be located a minimum of 5g_~eet back from the top of the steep shoreline bluff slope. The
proposed home will be located 50 feet back from the top of the steep shoreline slope. Based on
my inspection of the site, it is my opinion that this distance will be protective of the home for the
expected life of the home (at least 100 years). It is acceptable to have a deck within the 50-foot
setback area as long as the deck is not structurally connected to the home. The proposed deck
will be located no closer than 44 feet to the top of the bluff slope. The location of the deck 44
feet from the top of the bluff slope will not increase the risk to the proposed home nor will it
increase the risk of slope failures on the steep shoreline bluff slope.
NT! (1993) described a shallow bowl-shaped depression along the south side of the slope down
towards the intermittent stream. NT! indicated that the area may represent past shallow slumping
of soils, but noted that the potential slump area was not active. Past grading has taken place at
this location such that soil was removed from the upper part of the bowl like area and a rockery
February 26, 2009
Parcel 701311 021, Jefferson County, W A
Stormwater Plan
wall was constructed between the bowl area and the proposed building area. No recent movement
was evident. Prior to the NTI site visit, the level area had already been graded and it is possible
that past grading had placed organic rich soils with no compaction on the slope and some
settlement had taken place. I also observed what may be a very old skid road across the
intermittent stream valley. NTI recommended a setback from this bowl shaped area of 25 feet.
The proposed home site will be located greater than 25 feet from the bowl area. The proposed
building area above this are is underlain by weathered bedrock soil. Based on my observations
placement of the house on the level building area as proposed will be appropriate and the home
will not be subject to settlement from soils on the slope.
Storm water Management
The proposed stormwater plan meets the recommendations of NT I, and is consistent with the
Ecology (2005) stormwater manual adopted by Jefferson County. The proposed stormwater
management for the site is for full dispersion consistent with Ecology (2005) BMPT5.30. The
site will be left in greater than 65% tree and native vegetation and the amount of impervious
surfaces is less than 10% of the site. The stormwater generated by the driveway area is less than
the threshold requiring pretreatment and will be managed by BMP T5.12 (sheet flow).
Stormwater from the roof area will be managed by BMP T5.1 0 (infiltration).
The proposed stormwater management from the driveway area will be to allow sheet flow off of
the driveway surface towards the north consistent with Ecology (2005) BMP T5.12. The
following figure indicates where sheet flow dispersal should take place. Soils to the north of the
driveway area consist of well drained soils with topsoil and native vegetation. The soils are
Alderwood gravelly sandy loam. These soils are well drained and test pit observations on the
gentle slope below the driveway to the north are consistent with these soils being well drained.
Sheet flow off of the driveway to the areas indicted will not lead to any surface water flow across
the site and the soils will infiltrate all runoff before any water reaches the intermittent stream
located approximately 75 feet to the northeast.
^"----J
_','l..
Stratum Group
JEFFERSON'
DEPT, OF CO
SIGNATURE:
File: 1.1 0,09
2
DEPT.OFCOMMUNITYD~ I
<.lTr2.lt<.T A "rTTnn./ .'A I /A-...-/ -A;;'__
February 26, 2009
Parce1701311021, Jefferson County, WA
Stonnwater Plan
infiltration trench should be at least 10 feet long for every 700 sf of roof area and should be
installed such that the dispersion pipe is level. A typical design per Ecology recommendations is
presented below.
note hed
9 Rilde board
2'~r.2" note hes
18'O.C.
.- erd oap or plLg
cleM out 'N'!.E! flOm pipe
. 4" 0 r 6" pert, ratlld pipe J...O fl::il.t.~evel
t
........
inlll.Ent pipe (~~si:;Jn
fb..", :G.O.5 C FS pertreMh:1
~. +~
clean OlJtw'!.E! flOm pipe
PLAN
2"::<:12"
p re:s:sure
treated grade 'fi
ooard ~
......
clean (;;;,5% fi res)
11/i' . 3,1+ "w.9Shed rc()1<
NOTES:
1, Th is tfEl r.;, h shalt be oonstruo-ed so
.3$ b prevent point disch3.rge andklr
elOsbn.
SECTION A-A
2, Trenohes nosy be placed no obser
than 50 feet ti one ....ootr.;,r, (100 feet
ab rgfbwli ne)
3. Trench and gra,:ia ooaro most be
Iilval. Align to follow co nto ors of sit;,
4. Su P p:.rt post spac iog .:os .r>.tq uire:l by'
p,..~-~'~~,.""....,.. .,SQjl,;;;o.rditklns,.tl:<,QR';:u~ ~ffl,\de boam
! I
STOR~v1V!ATER PLAN I
IFile: 1.I 0,09
I
I
"15% rm,.'<;tCt'l1o.v ccntroll\vater qJaHry'
treat fTf.lrt in rural areas,
Stratum Group
4
L,~_
February 26, 2009
Parcel 701311021, Jefferson County, W A
Stormwater Plan
Conclusion
Based on my site assessment and the investigation by NTI, it is my opinion that development of
the site and the following of the stormwater plan will not cause any adverse impacts to the
stability of the site or adjoining sites. Furthermore, the stormwater plan utilizing full dispersion
of stormwater will not cause any significant degradation to streams or the shoreline.
Stratum Group appreciates the opportunity to be of service to you. Should you have any
questions please contact our office at (360) 714-9409.
Sincerely yours,
Stratum Group
J)'! .;/2.~/ ~f
-" .... - 'lG/ ~
\..../
Dan McShane, M.S., L.E.G.
Licensed Engineering Geologist
Stratum Group
STORM\VATER PLAN
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Infiltration Trench Details
Herold Residence
3962 E Quilcene Rd
Parcel# 701311021
MLA08-00363
n~htEd
9 ta::le board
2"x ~' note hes
18"0,(;,
---
Infl\ent pipe (m.a:x: c1e$gn
tbw :::.0,5 C FS pertrenchi
~""'I-
c e3Il out W'jE! from pipe
PLAN
10 feet of length required per 700
square feet of roof area
NOTES:
1, lh is tl'Jl ro h shalt be oonS'tJlJo~d so
as b prevent point di:s>;'~.alge and>:>r
e roSClft.
2. Tre"'~~es rriEf>,( be pliiCed noeboer
lh3Il50 feal t> one arolt>?r (iOO feet
abrg fbwlire)
3. Trench and grada b:>ard mlJ$tbe
la'c>?l, Algn~:> folb.'.' corrtoufsof sil?
4,.supp:>rt pO$tspaoingas reqlJired by
soil cord~bns to ensUlegrada bo3Jd
rerwins lweI.
, 1 ~ rfI:IX 1Ll' fi Q,If ccnttl.'1l/1!1$let' (?"Ial fly
treat rrert in rural areas,
SECTION A.A
,..-
May 13, 2009
Allan Herold
26020 SE 1 54th Street
Issaquah, W A 98027
STRATUM GROUP
P.O. Box 2546, Bellingham, W A 98227
Phone (360) 714-9409
Re: Stormwater Plan Review
Parcel 701311021, East Quilcene Road
Jefferson County, W A
Dear Mr. Herold:
I have reviewed the details for the draintile and downspout lines as indicated on Drawing A1.2
(attached). This is consistent with my recommendations for the drain lines receiving stormwater
from the proposed home. I will forward a copy of this letter directly to Jefferson County
Community Development attention to Cara Lekenby.
Best ofluck on your project. Stratum Group appreciates the opportunity to be of service to you.
Should you have any questions please contact our office at (360) 714-9409.
Sincerely yours,
n.... turn Grol1p
&/ ~ #tL
Dan McShane, M.S., L.E.G.
Licensed Engineering Geologist
ST()R~' M'<n ATPP'Tf ^'N
. _,j.il.c 1. \\.j~ "-.'-'.'-.1 L;11.1
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JEFFERSON COUN
APP]H~OVED
STOR:t\1VvATER PLAN
621 Sheridan Street, Port Townsend, Washington 98368
360/379-4450 voice, 360/379-4451 fax
http://www.co.jefferson.wa.us/commdevelopment/
STORMWATER SITE PLAN SUBMITTAL TEMPLATE
MLA#
08-00363
PROJECT/APPLICANT NAME: Alan C. Herold
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
site map.
This project involves a single family, two-bedroom residence with 2224 square feet .of living space .on tw.o f1.o.ors, and
an unfinished basement .of 1591 square feet. T.otal building f.ootprint will be 1591 square feet. Pr.op.osed deck area is
643 square feet and the gravel driveway will be appr.oximately 1558 square feet. The pr.oject includes 1000 gall.on
septic and pump tanks which tie into an existing drain field located 291 feet fr.om building foundati.on .on a separate
parcel. The building l.ocation has been chosen t.o ensure a 50 f.o.ot setback from the tap of bluff.
Existing C.onditi.ons Summary
2. Describe the existing topography. Indicate contours on the site map.
The .official building envelope is a level area identified in the .original survey and indicated .on the accompanying site plan.
It is bordered .on the west by a steep slape dawn t.o Quilcene Bay. The bluff area exhibits an .overall slope .of approximatel}
37 degrees. The slape is densely c.overed with native trees and underbrush. Trees appear t.o be sec.ond .or third gr.owth
and stand nearly vertical, indicating surficial and grass slape stability during their growth. The building area is baunded
an the n.orth by a slape dawn ta an intermittent seas.onal stream. Mature cedars and firs as well as .other brush caver
much .of the slape and .old grawth stumps are present.on p.orti.ons .of the slape. The site is bordered .on the East by E.
Quilcene Raad and .on the Sauth by a relatively flat, undevel.oped 5 acre parcel. C.ontaurs are identified .on the
accampanying site map.
3. Describe the existing vegetation. Indicate native vegetation areas on the site map.
Trees .on site are a mix .of D.ouglas fir, hem lack, western red cedar, big leaf maple, red alder and madr.one. Gr.ound
caver is c.omprised .of primarily with Oregan grape, salal, sward fern Vine Maple and .other brush.
4. Describe the existing soils. Indicate soil type on the site map.
This area is underlain Beausite-R.ock autcr.op c.omplex and Alderw.o.od gravelly sandy laam. The Beausite-R.ock
autcr.op soils cansist .of c.olluvium and residuum derived fr.om the underlying Twin Rivers F.ormati.on siltstane and
sandst.one. The sail is classified as well drained. The bedr.ock is highly fractured and layered. The sail is the
pred.ominant sail .on the steep sh.oreline bluff slape and .on the western p.orti.on .of the upland area .of the pr.operty.
The Alderw.o.od gravelly sandy l.oam sail derived fr.om basal till and c.onsists .of sand and gravel t.o depths greater
than 60 inches. The sail is classified as m.oderately well drained. The Alderw.o.od sail underlies the eastern p.orti.on .of
the pr.operty.
Hand dug test pits were dug and/or augered to determine soil properties in relation to drainage. Soils encountered
were consistent with the soil descriptions above.
Soil under the proposed building site are primarily fractured siltstone and sandstone residuum. With some areas of
gravelly soils towards the eastern portion of the building area. Due to past site grading to create a level area, the
thickness of the residuum is thinner than the native soils. The area to the north of the proposed home site is
underlain silty residuum soils north of the west end of the proposed home site. The soils north of the proposed home
site are Alderwood soils and include areas of thick topsoil with native forest duff overlying the gravely soils. The soil
duff and top soil layer is approximately 2.5 feet deep and sandy gravel soils extend to a depth of at least 4.5 feet.
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.
A small seasonal intermittent stream flows from across the northeast corner of the property flowing from the
southeast to the northwest. The stream continues towards the bluff face where it daylights on the bluff face as a
series of small cascades across the bedrock to the beach below.
No other surface flow is evident on the property. Areas where soils have been graded and compacted where the
home is proposed have been compacted such that minor surface flow off of the building pad area may occasionally
take place during very heavy rainfall events. Otherwise soils on the site are well drained.
Downward drainage of surface water into the soil ultimately becomes somewhat impeded by the underlying bedrock.
However, besides the small intermittent stream there are no indications of springs or seeps on the shoreline bluff
slope.
Due to the topography of the site surface drainage on the shoreline bluff slope is JiRliW&. w-theblu~~lopeitself and a
very limited area at the top of the bluff. Most of the upland area of the site is slop~dslJch tbatsutface water, jf
present would drain towards the slope to the south of the intermittent small stream.
6. Describe any excess levels of noise generated by the proposed use or activity:
Short-term construction related noise only. No long term noise sources.
7. Describe significant geographic features and critical areas (i.e., environmentally sensitiv~areassuch as wetlands, streams,
steep slopes, etc.) on the site. Indicate location on the site map.
The property is bordered on the west by a steep slope down to Quilcene Bay. This slope is a landslide hazard area
and erosion hazard area. An intermittent stream crosses the northeast corner of the property.
Ii
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.).
The project site is approximately 4 miles from Center Road on E Quilcene Road with the parcel fronting eastern
shore of Quilcene Bay. Adjacent land uses include a private residence to the North, a small private residence across
E Quilcene Rd to the east, an undeveloped 5 acre parcel to the South, and Quilcene Bay to the west. E Quilcene Rd
borders the property to the east.
Water to the site is from a share well located on a parcel across E Quilcene Rd to the east. Electrical power is
sourced from a power pole located in the southeast corner of the parcel. The septic field for the property is located to
the east on a parcel across E Quilcene Road.
Sensitive areas include the steep slope on the west side of the property a
property. An intermittent stream is located to the north.
,~'. I
d QUilc~lfc1>~lbDwest of he
STORMWATERPLAN
Permanent Stormwater Control Plan
This portion of the Stormwater Site Plan consists of the selection and installati n of the
and.facilities to remain in place after construction of the project is completed.
MAY 2 aIll
propriate stormwater c
JEFFERSON COUNTY
"Medium" size projects are required to have the totals calculated of all impe iouS'DBlt'faOFS:;(j}alIIl4lRi~_V~~iou
surfaces, and pollution-generating pervious surfaces to verify that the thre oISIG*11>>mment facilities and flow r.Ol"ltr I
facilities are not exceeded. .
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 srte or specific threshold discharge areas
within the site. Locate these facilities on the site plan and differentiate proposed facilities from existing facilities.
Site hydrology will not be altered. Stormwater will be allowed to sheet flow off of the access driveway as it currently
does. Stormwater from the roof area will be directed to a dispersionlinfiltration trench to the north of the home site.
Dispersed stormwater will infiltrate deep into the ground.
BMP T5.30 Full Dispersion will be utilized on this site. The cleared area for development will be less than 65% of the
site. The area not cleared will be left primarily as tree covered with native brush. The property is a rural single-family
residential development and less than 10% of the area will be covered with impervious surfaces.
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. [Thisis
normally for "large" projects or projects that involve the potential for dispersion of contaminants.]
The area of pollution-generating impervious surfaces is less than the threshold area of 5,000 sf. No treatment is
required. However, stormwater from the driveway area will sheet flow to the side of the driveway and infiltrate into
the ground.
11. Describe the performance goals and standards applicable to the project.
Stormwater will be fully dispersed and infiltrated into the ground. Stormwater will be directed away from steep
shoreline bluff slope and towards the north portion of the property into deep well drained native soils.
12. Describe the flow control system.
All stormwater will be fully dispersed. The site does not require flow control.
13. Describe the water quality system.
Dispersion trenches will be gravel filled, wrapped in filter fabric and top protected with fill. Native plans will be
maintained and left in tact as much as practical and will be left in place down slope from the dispersion trench. Sheet
run off to the sides of the driveway will infiltrate into the ground with minimum surface flow through vegetated areas
14. Describe the conveyance system analysis and design.
Design is simply a 4-inch pipe conveying stormwater to the dispersion trenches.
15. Describe the source of fill material, physical characteristics of fill material, and deposition of excess material.
.No fill material will be required except for the necessary drainage fill gravel and sand for the foundation. Excavated
materials will be relocated onsite away from the steep shoreline slope and away from the slope on the north side of
the property or hauled off-property.
16. Proposed methods of placement and compaction consistent with the applicable standards on Appendix Chapter 33 of the
Uniform Building Code.
A compactor will be used as necessary to achieve 90% of maximum density for foundation and driveway support.
17. Describe the .proposed surfacing material.
Grass with gravel driveway.
18.
Describe methods for restoration of the site.
Any disturbed sites will be restored with native plants: salal, sword fern and Oregon grape.
a
"
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. '~
N/A
20. List here and include any special reports or studies conducted to prepare the Stormwater Site Plan.
See attached geotechnical reports.
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.
A septic permit (SEP06-00237) was approved on November 11, 2006 and is being reviewed for consistency with the
submitted site plan.
CONSTRUCTION STORMWA TER 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 theeo~~t~~~ti~. . ""p
Pollution Prevention (SWPP) Best Management Practices (BMPs) Packet i&~LirdStlY, VGtiiDlarly
with rural residential development. STORM\VATER PLAN
SECTION I - CONSTRUCTION SWPPP NARRATIVE
~lrr.Q
, UIl...
1. Construction Stormwater Pollution .Plan Elements. Describe how each of the Constructio SWPPP
addressed. Identify the type and location of BMPs used to satisfy the required element. If an el ment is not..
justify in writing. Descriptions of the 12 Elements are found at section 2.5.2 of the Manual (begi ningI5ID>~~-&)
SIGNATURE:
12 Required Elements - Construction SWPPP
1. Mark Clearing Limits.
The building-affected portion of the parcel does not require any tree removal. Silt fences will be placed around the construction
area to ensure that sediment does not flow toward the shoreline or LSHA's.
2. Establish Construction Access.
A stabilized construction entrance will be provided at the interface to E Quilcene Rd. It will be a minimum of 25 feet in length by
10 feet of width. It will consist of 4 to 8 inch quarry spalls to a depth of one foot.
3. Control Flow Rates.
Native vegetation will be maintained as a wide vegetated strip between the proposed home site and the intermittent stream to the
north consistent with BMP C243 (Ecology, 2005). The slope to the north is underlain by well drained soils consisting of gravely
sand with thick topsoil. Sediment traps will be installed as required. Given the general topography of this parcel and the wide
native vegetated area to the north and well drained soils to the north of the proposed building area, it is expected that sediemt
traps will not likely be required.
4. Install Sediment Controls.
Silt fenc~s will be installed prior to site grading. Please see the attached map for location of silt fences.
5. Stabilize Soils.
Stockpiled soil and areas exposed for short periods (less than two days between October 1 and April 30 and less than one week
between May 1 and September 30 may be stabilized using appropriate measures from the following: mulch, straw or nets and
blankets.
6. Protect Slopes.
Silt fencing will be installed. The topography of the site is such that any possible drainage will be towards the north and not
towards the steep shoreline bluff. Please see the attached map for location.
7. Protect Drain Inlets.
There are no drain inlets that can be affected.
8. Stabilize Channels and Outlets.
There are no onsite channels or ditches that will be impacted. Native vegetation will be left in tact between the proposed home
site and the intermittent stream to the north.
9. Control Pollutants.
No vehicle maintenance will be performed and construction debris will be safely stored.
10. Control De-Watering (the act of pumping groundwater or stormwater away from an active construction site).
No construction dewatering will be conducted.
11. Maintain Best Management Practices (BMPs).
BMPs will be maintained. All temporary and permanent BMPs shall be mainatained, repaired and enhanced as necessary to
assure continued performance of their intended functions. All BMPs should be inspected at a minimum on a weekly basis, during
and immediately following s significant storm event (any storm exceeding 0.5. inches within 24 hours or 2.0 inches of rainfall
within 7 days).
12. Manage the Project.
All construction work shall follow the above described actions. If circumstances arise that require additional BMPs beyond those
listed, it is the owner/contractor's responsibility to implement those BMPs. The owner/contractor should inspect the site for BMP
implementation on at least a weekly basis and more frequently during significant rainfall events. .
2. Adjacent Areas.
a. Description of the adjacent areas that may be affected by site disturbance (e.g., streams, lakes, wetlands, residential areas,
roads).
An intermittent stream is located to the north of the proposed home site. The stream is separated from the proposed
building area by well vegetated native vegetation including mature trees. The stream should not be affected. The
intermittent stream has flows to the northwest off of the site and intersects the shoreline bluff slope to the northwest.
The stream at the bluff face and a short distance upstream of the bluff face is underlain by bedrock.
The shoreline bluff will not be effected by the clearing the proposed development as storm water readily can be directed
towards the north and not towards the shoreline bluff slope.
b. Description of the downstream drainage path leading from the site to the receiving body of water (minimum distance of 400
yards).
Stormwater will be infiltrated into the ground. The intermittent stream down slope from the proposed development is
located approximately 78 feet at the closest point of development. As noted above the stream flows to the northwest off
of the property to the shoreline bluff. The stream flows down to the beach over bedrock on the bluff slope.
3. . Environmentally Sensitive Areas.
a. Description of environmentally sensitive areas that are on or adjacent to the site.
The property is bordered on the west by a steep shoreline slope down to Quilcene Bay. This slope is a potential
landslide hazard area and potential erosion hazard area. Am intermittent stream is located to the north in a stream
valley.
b. Description of special requirements for working in or near environmentally sensitive areas.
All work will be within the limits of the clearing area. Any run off will be directed to the north and the native vegetation on the
slope between the proposed home site and the intermittent stream will be maintained.
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).
Soils on the site are well drained. The excavation for the home site may reach shallow weathered and fractured bedrock with lower
permeability than the native soils otherwise found on the site. All run off from this are will be directed towards the north towards well
drained soils and areas with thick native topsoil. Any run off will easily be directed away from the steep shoreline bluff slope.
5. Construction Phasing.
a. Construction sequence
Initial phase will be to prepare site access with a stabilized construction access from East Quilcene Road. Silt fences will
be installed around the perimeter of the west and north sides of the area to be developed. Once those steps are
completed, foundation excavation and preparation will begin. All excavated soils and disturbed soil will be stabilized as
soon as foundation work is completed and the rest of the home construction will proceed. Stormwater
dispersion/infiltration trenches will be constructed in preparation for completion of the home and hooked up to the roof
drains upon completion of the roof.
b. Construction phasing (if proposed)
This project is for the construction of a single home and phasing is not needed beyond the appropriate construction
sequence described above.
6. Construction Schedule. Wet season is October 1 through April 30 (page 2-21 of the Manual).
I. Provide a proposed construction schedule. 1L
April 1 to Sept 1
II. Wet Season Construction Activities.
a. Proposed wet season construction activities.
Initial foundation work may take place in the late portion of the wet season.
b. Proposed wet season construction activities for environmentally sensitive areas.
Environmentally sensitive areas will not be at risk as long as the BMPs proposed are followed.
7. Financial/Ownership Responsibilities.
a. Identify the property owner responsible for the initiation of bonds and/or other financial securities.
Alan C. Herold
b. Describe bonds and/or other evidence of financial responsibility for liability associated with erosion and sedimentation impacts.
Property owner will contract only with licensed, insured. and bonded trades people.
"
SECTION" - EROSION AND SEDIMENT CONTROL PLAN
Sediment and erosion control measures may be depicted on the master land use application plot plan, a
stbrmwater 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 tpp 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 asrequired.
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.
Stormwater Site Plan Changes
If ~he 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.
'11/1/08
(LANDOWNER OR AUTHORIZED REPRESENTATIVE SIGNATURE)
(jJJ~
(DATE)
3/;-11
THIS SPACE MAY BE USED FOR ADDITIONAL NOTES, IF NEEDED: