HomeMy WebLinkAboutLog034
JEFFERSON COUNTY
DEPARTMENT OF PUBLIC WORKS
P.O. Box 2070
1322 Washington Street
Port Townsend, WA 98368
(360) 385-9160
Frank Gifford, Public Works Director
Monte Reinders, P,E" County Engineer
MEMORANDUM
FROM:
Stacie Hoskins, Associate Planner
James W. Pearson, Project Manage~ ~
June 15, 2005
TO:
DATE:
RE:
Discovery Bay Golf Course Planned Rural Residential Development
Traffic Impact Analysis
The Department has reviewed the traffic impact analysis prepared for the project by
Geralyn Reinart, dated April 2005. While the Department concurs with much of the
analysis, this memo identifies the following issues that the Department believes should be
addressed:
. Peak hour volumes and turn movements were counted on March 8, 2005 (Page 3).
Department Comment: They should be multiplied by 1.27 to adjust for seasonal
factors. Table 1 Existing Levels of Service (Page 4) and Table 4 Future Levels of
Service (Page 10) should also be adjusted if they are extrapolated from the March 8
counts.
. The Trip Distributionl Assignment (Page 8) refers to Figure 3 that shows 45% of the
project traffic using the segments of South Discovery north of the project site, 50% of
the project traffic using the segments of South Discovery Road east of the project site,
and 5% of the project traffic using Cape George Road.
Department Comment: The analysis does not distinguish between the segments of
Cape George Road that are north and south of the Golf Course entrance. The
Department concurs that the trip distribution north of the Golf Course entrance would
be very low. However, the segment south of the Golf Course entrance to South
Discovery Road would receive the largest proportion of the project traffic,
approximately 300 ADT from the 34 residences that would share access with the Golf
Course entrance. The report should clarify this. The following Figures should be
revised to account for these two segments: Figure 3 Trip Distribution, Figure 4 AM
Peak Hour Assignment and Figure 5 PM Peak Hour Assignment. It appears that these
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volumes have been included in Figure 7 2009 Estimated PM Peak Hour Volumes and
Figure 8 PM Peak Hour Site Access. This should be confirmed.
. Traffic Volumes (Page 9) states that the projected future volumes are a conservative
estimate since traffic associated with the proposal would already be included in the
County's growth forecasts.
Department Comment: The County Comprehensive Plan forecasts 2.4% annual
traffic growth on South Discovery and Cape George Roads. The proposal would
increase traffic volumes by 15%-20% on the road segments immediately adjacent to
the site. While the projected future traffic volumes may be conservative, the traffic
associated with the proposal has not been "already included in the County's growth
forecasts". This statement should be revised.
. Non-Motorized Facilities (Page 7) states "The relatively low volume of traffic on the
roadways in the area lends them to reasonably safe travel for bicyclists, although the
roadways must be shared with motorized traffic."
Department Comment: The use of shared roadway bicycle facilities is typically
found on low speed, low volume roads. South Discovery Road and Cape George
Road are collector roads with approximately 1 ,400 ADT and 40 mph speed limits.
The analysis acknowledges that they do not meet standards for the existing traffic,
particularly shoulders, and that the extent of deficiency will increase with background
traffic growth and project traffic. Using the criteria in the Jefferson County Non-
motorized Transportation and Recreational Trails Plan, it would not be appropriate to
designate these roads as shared roadway bicycle facilities. This statement is not
consistent with the analysis and should be deleted.
. Non-Motorized Facilities (Page 10) states "The developers.. . are including an
extension of the Larry Scott Trail...to Cape George Road at the southern extreme.
This extension includes approximately 1.8 miles of new, privately owned and
constructed trails that will be available for public use and will provide a significant
addition to the non-motorized facilities in the area."
Department Comment: The Department acknowledges the benefit from public use
of the proposed trails. However, the terms of public use are not specified in the
Traffic Impact Analysis, PRRD Narrative, or Environmental Checklist. The PRRD
Narrative (Item 7 A.4.d.4) states that the trails would be for the use of residents and
neighbors. Would this include the general public? Could public use be withdrawn?
Would public use be guaranteed by a public access easement or dedication? Unless
there is an appropriate guarantee of on-going public use, the analysis should be
revised to clarify that a private trail system is proposed. The Department also notes
that the trail system would not provide an alternative non-motorized route along the
segments of South Discovery and Cape George Roads that have deficient roadway
shoulders and would be most impacted by the additional traffic generated by the
proposal.
. Project Impacts 1 Recommendations (Page 12) notes that the proposal will generate
approximately 460 additional ADT. It acknowledges that neither South Discovery nor
Cape George Roads meet current standards for roadway shoulders for the existing
traffic volumes. It also acknowledges that the traffic volumes generated by the
proposal and background traffic growth will result in overall traffic volumes that
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exceed the threshold of 1,500 ADT. This traffic volume would require a 22 feet wide
traveled way with 6 feet wide shoulders. The segments of these roads immediately
adjacent to the proposal site have a 20 feet wide traveled way and 2 feet wide
shoulders. The traffic impact analysis concludes that "Due to the limited off-site
impacts associated with the project, no mitigation measures would necessarily be
required."
Department Comment: This conclusion does not appear to be supported by the
traffic impact analysis. The Department will make a recommendation to the SEP A
Responsible Official and to the Hearing Examiner regarding the project's impacts to
the transportation system and appropriate mitigation.
This memo is being submitted to the Department of Community Development with
copies to the project proponent and the author of the traffic impact analysis to facilitate
their response to the Department's comments. The Department requests that the SEP A
threshold determination not be made until the Department has had sufficient opportunity
to review the proponent's response. '
c: Michael Asmundson, 7377 E Doubletree Ranch Road #180, Scottsdale, AZ 85258
Geralyn Reinart, 1319 Dexter Avenue North, Suite 103, Seattle, W A 98109
Jerry Smith, PO Box 855, Chimacum, WA 98325
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621 Sheridan Street. Port Townsend. Washington 98368
360/379-4450.360/379-4451 Fax
http://www.co.jefferson.wa.us/commdevelopmenU
STORMWATER SITE PLAN SUBMITTAL TEMPLATE
MLA#
PROJECT/APPLICANT NAME:
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
stonnwater 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.
Discovery Bay Golf Club (DBGC) is an existing golf course on a 199.3-acre site located southwest of the City of Port
Townsend in Jefferson County. This golf course was initially constructed in 1925 and has remained in continuous operation
since that time. Six separate drainage sub-basins have been identified for the stormwater management study on this project,
Soils in the study area are generally classed in SCS" hydrological group "C" soils with moderate infiltration potential, The
land slopes generally toward the west with slopes of 5-15%. This project will add new impervious surfaces consisting of
roadways, arkin areas, walkwa 'S and residential units.
2.
Existing Conditions Summary
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Describe the existing topography. Indicate contours on the' site map.
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point on the east side to the point of concentration
3.
The site has a total glevlfilon change oj''iipproximately 170-feet from
at Discovery Bay," oad. Contours are indicated on drawing C-1.
Describe the exist! ~ - lvevegetation areas on ~.:_~e ~p.~~
The turf areas of the golf course have been in e;~tenc;;"iice1925:"&1ost ojiJ;;;~maining portions of the site have been
logged within the past 3D-years and now consists of second growth timber with moderate underbrush. A delineated wetland
exists to the east 0 the construction site.
Describe the existing soils. Indicate soil type on the site map.
4.
The existing soils are hydro-geological type "C" with moderate infiltration capacity.
5. ~cribe the existing site hydrology (i.e., drainage; behavior of water on the site-above, below, and on the ground). Indicate
existing stonnwater dramage to and from the site on the site map. Depict separate drainage basins on the site map, if
applicable~ and indicate acreag, of each. (, ~ _ /
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The site general'ty-tlttlns from the west toward the southeast. Six separate drainage sub-basins are indicated on drawing C-1.
6. Describe any excess levels of noise generated by the proposed use or activity:
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A limited amount of noise is expected to occur during construction, however, since this project is not adjacent to any
residential properties, noise is not expected to be an' issue. During operation, the DBGC is not expected to generate any noise
that would be objectionable at the site.
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7. Describe significant .geogra~hic featu~es and_~rj~i~~llrea"s{j,e.. enviro~~~'y sensiti~e. a~~s such as \\Ie~l~~~~~~n:e~n!:.:~~~..
slop:.~etc.) on the sIte. IndIcate Ioc~tIo~()11 tile sIte map. - /.f'... ....-....\ ' ", ~. - _..._._~
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A regulated wetl;;d exists :1 ~he east of the construction site, as shfwll on Drawing Col.
8. Describe the general vicinity of the site, including adjacent land uses ch1res..uklit-ies;roads, and sensitive/critical areas
(streams, wetlands. lakes, steep slopes, etc.).
Access to DBGC is from Cape George Road and Discovery Bay Road. Land use in the general vicinity is zoned as rural
residential with one lot per five acres. The existing access to DBGC will be shifted approximately J DO-feet to provide improved
sight distances and better access to the planned residential units. A wetland is located to the east of the construction site,
Permanent Stormwater Control Plan
This portion of the Stormwater Site Plan consists of the selection and installation of the appropriate stormwater control BMPs and
f~b1!e~tM:,main in place after construction of the project is completed.
t:Mediurnll ,gfze projects are required to have the totals calculated of all impervious surfaces, pollution-generating impervious
\'~d"a~d pollution-gene<ating pm;oos ,odace, 10 verify tha, the ''''esholrn fo, trcalmeo, fucil;ties aod flow control fucmtie,
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are not excee e .
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 differentia.t.,e prop~sed faci~ities from 9'-is~g faCilities., Y.' "i
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"~~'=GuFja no.f1 rom a roximatel 75% of the site will remai changed, Runoff from the roof of structures will be collected ~
and routed to dispersion trenches ocated on each lot. uno rom the aved arkin area will be routed through II Vortechs "
2000 vault for water qualiiY'purPoses. This vault is expected to remove about 90% of the suspended solids in the storm water,
Following treatment in the Vortechs vault, the discharge will be routed through a pond that will also provide detention storage.
The release rpte fro,,! the dis~:rsionto/>nch >"'.ill be fontro/led at50% of e 2-)'ear.24-Hour peak j/owrate.
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] O. If the projec 'res e use of stormwater treatmen' cilities, describ 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 'I arge' projects or projects that involve the potential for dispersion of contaminants.]
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Water quality will be maintained through utilization of a Vortechs 2000 water quality vault, or by routing through bio-swales, as
shown onthecon:!:,uc:~~n,~'il~ings. " /'"? .--.
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I Flow hydrographs for the pre-development condition and the mitigated post-development condition were developed using the
\ continuousjlow hydrograph modeling method as described in the Washington State Department of Ecology Stormwater
, Managemen~ for Western Washington. Piping was sized by on the nomographs provided in the same manu"
sL.o0'U~.:'l;~ . ~o-J ~J. ~l0'f.S..s ,.., e?t.-h,..;..{ 0""; ~~~
Describe the source of fill ma ial; physical characteristics of fill material. and deposition of excess material.
On s~te mate,:ials. ll..r.....e g... e..n.. er. ally ",peeted to Pr. s..Uit. able far fill on /he site. It Is expect-:::; ~~.exz:J of 2500 $!!J!i: yords will
requore !'.!f"'e d/sp<>sal"" :: A-{' h:."A ~......,.- h-fvL r 0___ "[lJ--T '/ ;:fi.f:h"..~
16. Proposed methods of placement and c paction consistent with the applicable standards on Appendix Chapter 33 of the
Uniform Building Code.
Material will be placed in 6-inch lifts and compacted to 95% maximum dry density.
17. Describe the proposed surfacing material.
WSDOT standard Class "B" asphalt will be used on paved swfaces.
18. Describe methods for restoration of the site.
Areas disturbed dUrin!!, C ~"1'ction thot ore not ~ovcred bY. l.'mI?ervious SU1.@crwillbjtI;}.an7tedwithnativeVegetationand
g~~sses. tjoy.t.J C-ft-,r ~ JfVoul t4-~t~. V':f'( J-rlr'f(l . Nll-It ,f:...{C ~
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19. An Operation and.Maintenance Ma is required for ea flow c trol and treatment facility. [This is normally required for
'large' projects ohly and only those for which facilities ar required to control flow or treat runoff.] IfIncluded, list the
Iv;lanuals here.
20. List here and include any special reports or studies conducted-to prepare-the Stormwater Site Plan.
Storm water runoff volumes were calculated using the continuous modeling simulation method described in the Western
Washington Stormwater Management Manual. The runoff analysis is included in Appendix "A".
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.
The project will also require issuance of a building permit from Jefferson County. No additional storm water drainage
requirements are expected to be imposed.
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CONSTRUCTION STOR.MWATER POLLUTION PREVENTION PLAN (SWPPP)
The Construction SWPPP addresses sediment and erosion control during construction, The BMPs indicated by the applicant i.
the template that follows must be installed on the ground during all construction phases of the project. The proponent is responsible fQ
preventing sediment and erosion impacts to environmentally sensitive areas and ofT-site areas. Consult the CQnstruction StQrmwate
Pollution Prevention (SWP? fest Manarm;.rn Practices (BMPs) Packet for guidance, particularly with rural residentia
develQpment -Jl Id . (..;left. ,It. .!-
SECfJON I-CONSTRUC~~ SWPP/N~~T~E 1V1fL;("lhhJt.-- i "6.M'r"' d~"'I..A_
I. Construction Stonnwater Pollution Plan Elements. De ow each of the Construction SWPPP elements has been or
wilt ~e addressed. ~ntify the !YQe angJo~~io~__o. s used to satisfy the required elem~nt If an element is not
apphcable to the proposal, justify III wnting, Oescriptions 0 the 12 8ements are found at sectlOn 2.5.2 .of the Manual
(beginning on page 2-15),
J 2 Required Elements - Construction SWPPP
1. Mark_
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2. Establish Construction Access.
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6. Protect Slopes.
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7. ProtecmrmnI;;!ets.
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f 2 Required Elements - Construction SWPPP (continued)
8. Stabilizt:,_Chaiinets:1ln.~,Outlets.
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9. Control PO!!Y!l!111s.
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10. Control De-Watering (the act ~fpu~g groundwater or storm wa~er away from an active construction site).
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11. Maintain Best Management Practices (BMPs).
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Periodic inspections will be performed by Washington Engineering to ensure that BMP's have been installed and are
properly maintained.
12. Manage the Project.
Washington Engineering will periodically monitor the temporary erosion and sedimentation features to ensure that they are
functioning properly.
2. Adjacent Areas.
Description of the adjacent areas that may be affected by site disturbance (e.g., streams. lakes, wetlands. residential areas.
roads).
a.
An existing wetland to, the east of the ....liiJn''Sil.e will receive treated storm water from the construction site. Measures
to control impacts are included 0 rawing C-3 )
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~scription of the downstream drainage path lead~ from the site to the receivin~..29dy of wate~Jminimum dis!..~ce oL_,
400 yards). .
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b. Runoff from this site will be treated to the maximum practicable e.xtent by routing through swales and open grassed areas
prior to discharge from the dete tion ponds. The runoff from the pavf}d parking area wil{ be treated by a water quality
device prior to dischar e. ,.Jo- /.~c, d' ~..t<:rz().-...)
3. Envirorunentally Sensitive Areas.
a. . Description of ~nvironrnentally sensitive areas that are on or adjacent to, the~te.
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A wetland area exists to the east of the construction site. near an area where road improvements will be made and seven
residenUalunits will be constructed A "siltfence" will be installed to ensure that runoff is controlled to prevent deposition
;;;silt in the wetland. ..... 1 0/, t""'o ITr-'!!1
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/' 4. Erosion Problem Areas. Description of potential erosion probleJl1s on site In the context of the characteristics of the on-site soils
(e,g" erodibility, settl~.:"'l;ty, .')1". n..lea~ility, depth, tcxtu/ SO.il stmch.lrC).
3: ~~~ 01- c(q~\'.;;L.o4d Cc~l..,;J~~ (>..J .-i'Vfr,/?'\ .Jcf'J'rJ"
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a. Constmction sequence
(/) Erosion control and Silt Fences will be installed.
(2) Clearing will occur within the limits showlI 011 drawings
(3) Site soils will be stabilized as required.
(4) Storm drainage features and structures will be installed.
(5) Excavation "viii occurfor the foundations and floor slabs,
(6) Grading will occurfor roads and parking areas.
(7) Pavements will be placed as shown on drawings
b. Construction phasing (if proposed).
Phasing is planned to construct the residential units that will be constructed on site. Full build-out of the project is
ex ected in 2009. .
6. Construction Schedule. Wet season is October I through April 30 (page 2-21 of the Manual).
1. Provide a proposed construction schedule,
The initial phase of golf course improvements is expected to start in June 2005 and complete by October 2005,
r!le initial construction phasefo~' the roads and residences is expecte.!! ~() start in OctoQgr 200:; and continue
throll h a lanned com letion in 2009. -
II. Wet Season Construction Activities. J.t,., A
a. Proposed wet season construction activitics. I'!-;~~'!/ ~t:;;: t-t.J~ J'r--f.!I/?"kn'
7 af. /f1J{h c( f.-d <:
Installation of silt fences and grading within construction area,
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b. Proposed wet season constmctio~tivities for environmentally sensitive areas.
Installation of silt fences and gradinK witbin construction area.
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7, Financial/Ownership Responsibilities,
a. Identify thc propcrtyowner responsible for the initiation of bonds and for other financial securities.
WeFore LLC (Discovery Bay Golfelub)
b. Describe bonds and/or other evidence of financial responsibility for liability associated with erosion and sedimentation
impacts.
BOllding o/features will be accomplished as required by Jefferson COllllfY.
8, Engineering Calculations. Provide Design Calculations on a separate sheet for the following. if applicable.
a. Sediment Pondsffraps. -N/A
b, Diversions. -N/A
c, Waterways, -N/A
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SECTION Il- EROSION AND SEDIMENT CONTROL PLAN c',) ,,~,-:t--_O(_!2c.,_
Sediment and erosion control measures may be depicted on the master land use application plot plan, a stonnwater site pIan, and/or a
separate Construction SWPPP site plan. This is a checklist to ensure that the following are depicted on a site plan:
i'i," General.
d,
Runoff/ Stomlwater Detention CaI~ulations - See Appendix A.
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4. Location of Detention Best Management Practices (BMPs). Identify locati n of etention BMPs.
AErosion and Sediment ~ontrol Facilities. I? II / I
~...-t a. Show the locatIons of sediment trap(s), pond(s), pipes and structures. wi'?/{ t . D""c-~{....
, b. Dimension pond berm widths and inside and outside pond slopes. .
N/ A c. Indicate the trap/pond storage required and the depth, length, and width dimensions.
N/ A d. Provide typical section views through pond and outlet Structure.
N/ A e. Provide typical details of gravel cone and standpipe, and/or other filtering devices.
Detail stabilization techniques for outlet/inlet. ?
Detail control/restrictoI device location and details. !.k.f .
~er.~fy.D11.1.l"~<!,or r:commended .cover of berms and slope,S. .
ProvIde rock specIficatIOns and detaIl for rock check dam( S).' if appIica~~/
Specify spacing for rock check dams as required. a".J tt.o;f-d d'(L...t(
k. Provide front and side sections of typical rock check dams.
1.) Indicate the locations and provide details and specifications f~ silt fabric.
--lD. cate the construction entrance and provide a detaiL
De tailed Drawings. Any structural pr ac tices used that are not referenced in the Ed:OIO ~ual should be explained and
illustrated with detailed drawings. C' h-. h . I . /" L
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Standard ractices and BMP's are in com liance with the Ecolo Manual. f
7. Other Pollutant BMPs. Indicate on the site plan the locations ofBMPs to be used for the control of pollutants other than
sediment (e.g.. concrete wash water),
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N/A
N/A
N/A
X
X
6.
x
x
2.
x
x
x
x
N/A
x
x
x
x
x
a. Vicinity Map
b. Jefferson County Approval Block
c. Erosion and Sediment Control Notes
Site Plan.
a. Legal description of subject property.
b. North arrow.
X'" Indic~te boundaries of existing v~getatio~ (e.g., tree lines, pasture ~s, etc.).
~) IdentIfy and label areas of potentIal erosIOn problems. W ~ $1 t.. .:-
~.. ...... dentifyFEMA base flood boundaries and S. horeline Management boundaries (if applicable).
Show existing and proposed contours.
p.$C~~ Indicate drainage basins and direction of flow for individual drainage areas.
LYLabel 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.
CO~V ce Systems.
AJesignate locations for swales, interceptor trenches. or ditches.
. ./ShOW all temporary and permanent drainage pipes, ditches, or cut-Off. trenche. s required for erosion & sediment control.
f' rovide minimum slope and cover for all temporary pipes or call out pipe inverts.
~/ 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. -
3.
X
X
X
X
X
N/A
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None Re uired
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 downstreanl of the project site.
Not Applicable
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Stormwater Site Plan Changes
If the designer wishes to make changes or revisions to the originally approved Storrnwater Site Plan, the proposed revisions shall be
submitted to Den 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 BMP:
(not standard on-s- stonnwater management BMPs), the applicant shall submit a final corrected plan ("as-builts") when the project i:
completed. These should be engineering drawings (stamped by a licensed civil engineer) that accurately represent the project ~
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 pro~~~<~~~~~'~=~--=--~=-___,
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/'/ ~~'"'''''<:;'''
( (I.ANDOWNER OR AUTHORIZED REPRESENT A T1 VE SIGNATURE) \
~-----
THIS SPACE MA Y BE USEDFOR ADDITIONAL NOTES, IF NEEDED:
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1
Yearly Peaks for Predeveloped
1E1IR fLOW(d$)
'100 5.057
50 4,324
25 3.632
']I) 2.773
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Yearly Peaks for developed W/O Pond
YfM 'ROW(d$) -----,
100 .4543
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50 . jP6f
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10 20 30 405060 70 80 90 99
Cumul;.:ltiveProbability
Flow Frequency Chart
1} PI edevelol)ed
x De~loped with Faciflty
1OE-5 1OE-4 10E-3 1OE-2 1OE-1 1
Percent Exceedin
Duration Graph
10
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Appendix A
Sub-basin A