HomeMy WebLinkAboutSW8060831_COMPLIANCE_20061005STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW263
DOC TYPE
El CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
�ZV COMPLIANCE EVALUATION INSPECTION
l
DOC DATE
�201110 LiK)S-
YYYYMMDD
1-
INFILTRATION BASIN & PUMP SYSTEM ANALYSIS FILENAME S IWQSIINBASIN1060831 WK1
1 Pump Station, 6" FM to Basin Page 1 of 2
PROJECT NUMBER SW8 060831 DATE 05-Oct-06
PROJECT NAME Overlook at Caison's Creek
DRAINAGE BASIN Lumber REVIEWER P Bartlett
RECEIVING STREAM UT ICWW CLASS SA, HQW
Index No 15-25 If ORW, is site within the 575' AEC?
SITE AREA 7 42 acres DRAINAGE AREA 1 323,215 SF
DRAINAGE AREA 2 SF
IMPERVIOUS AREA CALCULATION
BASIN 1
BUILDINGS
PARKING/ASPHALT
CONCRETE
OTHER (amenity)
% IMPERVIOUS, 1=
Rational C
83,940 095
55,452 095
19,602 095
10,660 095
TOTAL 169654 C 059
Place a "1" here if Rational
RV= 05+ 009 (1 ) = 0 5�
BASIN 2 Rational C
BUILDINGS
PARKING/ASPHALT
CONCRETE
OTHER
TOTAL ®C f#DIV103
Place a "1" here if Rational
% IMPERVIOUS, 1= # I /1Q1 RV= 05+ 009 (I) = O O!
ELEVATION OF SEASONAL HIGH WATER TABLE
REPORTED INFILTRATION RATE
SURFACE AREAS AND ELEVATIONS
INFILTRATION BASIN
Elev (ft) Area, sq ft
BOTTOM 308 26891
30 8 26891
308 26891
TOP 317 30690
PUMP BASIN 1-A (Storaae above PP
BOTTOM 24
50
24
50
PP 24
50
24
50
24
50
TOP 25
50
PUMP BASIN 1-B (Storage above PP)
BOTTOM
0
2$ FEET MSL
5 INCHES/HOUR
or 0 000116 FPS
Inc Volume Acc Volume
0
0
25911
(Pump Station Only)
0
0
0
0
0
50
TOP
STORAGE VOLUME ABOVE PP, BASIN 1-A & 1-13
lot
0
0
25911
0
0
0
0
0
50
0
0
0
0
0
0
50
Basin 1/Pump 1
INF BASIN
in 2/Pump
INFILTRATION BASIN & PUMP SYSTEM ANALYSIS FILENAME S 1WQSIINBASIN1060831 WK1
PROJECT NUMBER SW8 060831 Page 2 of 2
PROJECT NAME Overlook at Carson's Creek DATE 05-Oct-06
PUMP BASIN 2 (Storage above PP)
BOTTOM 0 0
0 0
PP 0 0
0 0
0 0
TOP 0 0
STORAGE VOLUME ABOVE PP, BASIN 2 0
VOLUME 1 DEPTH 1 DRAWDOWN CALCULATION
BASIN 1 BASIN 2
DESIGN STORM, INCHES
DESIGN VOLUME
TOT VOL AVAILABLE, Infiltration Basin
DEPTH OF RUNOFF
TIME TO DRAWDOWN INF BASIN
INF BASIN DRAWDOWN RATE
TOT AVAIL VOLUME ABOVE PP
SELECTED PUMP RATE Must Be< 1397 0 gpm
GPM Storage Basin Drawdown
Days Hours
420 0 26 j jj
PUMP 2 #DIV/Ot #DIV/01
TOT PUMP RATE 420
CUBIC FEET
CUBIC FEET
FEET
HOURS MUST BE <120
GPM
CUBIC FEET
Pipe Size, in
Frict Factor,f
2
0 019
3
0 018
4
0 017
6to10
0015
12
0 013
Drawdown Time at Total Pump Rate 030 Hours
Volume Pumped & Infiltrated in First 2 Hours 67385 CIF
Tot Vol Infiltrated Plus Stored in 2 Mrs Must bey 21106 67885 CIF
(Required storage at infiltration basin & design vol infiltrated in 6 27 hrs)
PUMP SIZING
PUMP SYSTEM 1 PUMP SYSTEM 2
6 ENTER PIPE SIZE, D, INCHES
d 016 ENTER FRICTION FACTOR,f
ENTER SYSTEM QUANTITIES (from above table)
Basin 1 ' j Basin 2
C3tL
Item
K
Eq Langth,ft
45 deg std el
024
00
5
90 deg std el
045
750
Std Tee- Run
03
00
Std Tee
09
00
1
Gate Valve-ope
012
40
1
Swing Check -open
075
250
Foot Valve
13
00
Reducer to dia R
1
0486
2
0
0 500 500
00
0
EQUIVALENT LENGTH, ft
120 2
ENTER STRAIGHT RUN OF PIPE, ft
TOTAL LENGTH OF PIPE, ft
HEAD LOSS, hf, FOR PIPE SIZE
ENTER REQUIRED LIFT, ft
PUMP OPERATING POINT
REQ'D TOT DYNAMIC HEAD, TDH, ft
PUMP RATE, gpm
345,E
465,2
49
66
11�7
420
Qty Item
K
Ea Len
45 deg std el
0
00
90 deg std el
0
00
Std Tee- Run
0
00
Std Tee
0
00
Gate Valve -open
0
00
Swing Check -open
0
00
Foot Valve
1 3
00
Reducer todia R
0 1 4 #DIV101
#DIVI01
0 L 4 #DIV101
#DIV101
EQUIVALENT LENGTH, ft
#DIV101
#DIV101
(Inf Basin bottom elev - Pump Off elev)
#DIVIO t
0
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07/05/2006 WED 16:48 FAX 910 343 9604 Norris, Kuske, Tunstall 001/009
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North I6tplrtmeMSERAnt and Natural Resources
ry y n 127 Cardinal Dnve, Wilmington NC 28405 (910) 796.7215 FAX (910) 350-2004 NKT #06072
Y1IL�
Request for Express Permit Review
r�
� d
FILL-IN all information below and CHECK required Permits)
FAX or *marl to Cameron. WeayereacmarLnet along with a narrative and vicinity map of the project location.
Projects must be submhied by 9:00 A.M. of the review date, unless prior arrangements are made.
APPLICANT Name Charles R. Price, Manager
Company Overlook at Caiso 's C ek LLC
Address 3105A Holden Beach Road City/State S, upply. NC _ Zip 2846County Brunswick
Phone 910-842 7898 Fax 566-721-8265 Email NIA
PROJECT Name Overlook at Canon's Creek
PROJECT SYSTEM(S) TRIBUTARY TO UTATLANTIC INTRACOASTAL WATERWAY (STREAM NAME) Lumber RIVER BASIN
ENGINEERICONSULTANT J Phillip Norris, P E
Company Noms Kuske & Tunstall Consulting Engineers, Inc
Address 902 Market Street_ _ _ _._ _ _ City/State Wilmington. NC __Zip 284 11 County New Hanover
Phone 910-343-9653 Fax 91a-343-9604 _ Email anorris(&nkteng com
State or National Environmental Policy Act (WA, NEPA) — EA or EIS Required ❑ Yes ❑ No
❑ STREAM ORIGIN Determination; # of stream calls, Stream Name
® STORMWATER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other
Wetlands MUST be addressed below ❑ Low Density -Curb A Gutter ® High Density -Infiltration ❑ Off site
COASTAL ❑ Excavation &, F11 ❑ Bridges &, Culverts ❑ Structures Information M
MANAGEMENT ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront
® LAND QUALITY ® Erosion and Sedimentation Control Plan with ZQ acres to be disturbed
WETLANDS (401) Wetlands on Property ❑ Yes ® No Isolated Wetlands on Property ❑ yes ® No
Qg9Ap/1 that apply Wetlands Will Be Impaded ❑ Yes ® No Weiland Impeds 0 Acre(s)
Wetlands Delineation has been completed ❑ Yes ❑ No ❑ Buffers Impacted ____-Acre(s)
USACOE Approval of Dehneafron completed ❑ Yes ❑ No
404 Application in process w1USAC0E ❑Yes [:]No I Permit received from USACE ❑Yes ❑No
401 Application required ❑Yes ❑ No If Yes, ❑ Regular [] Express
Additional fees, not to exceed 50% of tide original Express Review permit application fee, may be charged for
subsequent reviews due to the insufficiency of the permit applications.
For DENR use only
SUBMITTAL DATES: Fee Split for multiple permits
SW $
CAMA $
LOS $
401 $ Total Fee Amount $
07/05/2006 WED 16:50 FAX 910 343 9604 Norris, Kuske, Tunstall
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v
D IV_
JJ
137 _
1139 Nc
SITE w
BEACH NC
ATLANTIC
OCEAN
VICINITY MAP
NO SCALE
07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall
2003/009
NARRATIVE
DESCRIPTION
The project site is a 7 acre tract located in Holden Beach in Brunswick County
The soils of the site consist of lightly vegetated, sandy topsoil and grades ranging from
0 5% to 2 0% Approximately 7 0 acres will be graded to allow construction of a new
residential community with paved parking and paved access The runoff from the site is
estimated using the rational method 10-year design storm and rainfall data for the area
Construction is scheduled to begin as soon as all permits and approvals are obtained
EROSION CONTROL MEASURES
The attached plans and specifications outline the requirements for erosion
control measures Silt fencing will be provided where stormwater would be expected to
sheet flow from disturbed areas directly to adjacent property Gravel check dams will
not be provided unless the Contractor has to temporarily discharge into an open ditch
instead of the proposed storm drain outfall A gravel construction entrance will be
constructed at the entrance. Maintenance will be provided by the grading contractor
and developer
STORMWATER MANAGEMENT MEASURES
The project site is located in Brunswick County. Land disturbing on the site will
exceed one acre, which requires the site to comply with the State Regulations The
stormwater runoff from the development will be directed to an onsde infiltration basin
The stormwater system is designed to accommodate this site with 1 5 inches of initial
runoff storage and by-pass of the excess
CONSTRUCTION SEQUENCE
The Contractor will install the gravel construction entrance and silt fence prior to
beginning any clearing and grading operations Additional silt fence will be installed
when and if conditions warrant during construction The silt basins wlll be constructed
immediately after that portion of the site is cleared, and outlet structure with protection
will be installed Disturbed areas will be landscaped or seeded upon completion
07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall Z004/009
EROSION CONTROL NOTES AND MAINTENANCE PLAN
Install erosion control measures before beginning construction or as soon
thereafter as possible All erosion and sediment control practices will be
checked for stability and operation following every runoff -producing rainfall but in
no case less than once every week Any needed repairs will be made
Immediately to maintain all practices as designed
2 Maintain the gravel construction entrances in a condmon to prevent mud or
sediment from leaving the construction site The contractor shall inspect the
construction entrances on a daily basis This will require periodic top dressing
with additional No. 4 stone Any objectionable materials spilled, washed, or
tracked onto public roadways shall be removed immediately
3 Install erosion control measures around the drop inlets as shown on the plans to
trap silt during construction Inspect the erosion control around the inlets after
each rain and make repairs immediately Remove sediment when It becomes
0 50 deep to provide adequate storage volume for subsequent rains When the
contributing drainage area has been adequately stabilized, remove all materials
and any unstable soil and either salvage or dispose of it properly Bring the
disturbed area to proper grade and appropriately stabilize all bare areas around
the drop inlets
4 Sediment will be removed from behind the silt fence when it becomes 0 5 feet
deep at the fence The sediment fence'will be repaired as necessary to maintain
a barrier Silt fence stakes shall be spaced 6 feet apart unless a wire backing is
used with 8 foot stake spacing
5 Inspect temporary sediment traps 1 check dams after each period of significant
rainfall Remove sediment and restore the trap to its original dimensions when
the sediment has accumulated to one-half the design depth of the trap Place
the sediment that is removed in the designated disposal area and replace the
contaminated part of the gravel facing. Check the structure for damage from
erosion or piping. Periodically check the depth of the spillway to ensure it is a
minimum of 1 5 ft below the low point of the embankment Immediately fill any
settlement of the embankment to slightly above design grade. Any riprap
displaced from the spillway must be replaced immediately After all sediment -
producing areas have been permanently stabilized, remove the structure and all
unstable sediment Smooth the area to blend with the adjoining areas and
stabilize properly
6 The angle for graded slopes and fills shall be no greater than the angle that can
be retained by vegetative cover or other adequate erosion -control devices or
structures In any event, slopes left exposed will, within 21 calendar days of
completion of any phase of grading, be planted or otherwise provided with
07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall
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temporary or permanent ground cover, devices, or structures sufficient to restrain
erosion.
7 All disturbed areas shall be seeded within 15 days of disturbance All seeded
areas will be fertilized, reseeded as necessary and mulched according to
specifications in the vegetative plan to maintain a vigorous, dense vegetative
cover
8 More stringent measures shall be used to halt erosion if those shown on this plan
are not effective
9 All erosion shall be controlled including side slopes before the project is
completed
10 Remove temporary measures upon completion of project All permanent
measures will be well established before project closeout
07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Huske, Tunstall
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SECTION 02920
SOIL EROSION AND SEDIMENTATION CONTROL
GENERAL
1 1 Contractor shall take every reasonable precaution throughout construction to
prevent the erosion of sod and the sedimentation of streams, lakes, reservoirs, other
water impoundments, ground surfaces, or other property as required by State and Local
regulations
12 The Contractor shall install all required silt fences, and construction entrances at
the initiation of work, and have these measures reviewed and approved by the local
permit authority prior to Gearing and grading operations
13 The Contractor shall, within 15 days of suspension or completion of land
disturbing actmties, provide permanent protective covering for disturbed areas
Temporary and permanent erosion control measures shall be coordinated to assure
economical, effective, and continuous erosion and siltation control throughout the
construction and post -construction period Use the specfied seed for both temporary and
permanent seeding
2 PRODUCTS
21 Asphalt for anchoring mulch shall be Type SS-1 Emulsion
22 Fertilizer shall be 10-10-10 grade or equivalent
23 Lime shall be dolomitic agricultural ground limestone containing not less than 10
percent magnesium oxide
2.4 Mulch shall be small grain straw, hay, wood chips, asphalt emulsion, jute or other
suitable material free of undesirable weed seed
25 Phosphate shall be 20 percent superphosphate or equivalent.
26 Seed shall be 20% carpet grass, 24% Bermuda, 20% turf Fescue, 10% Creeping
Red Fescue, and 24% Annual Rye gram Bermuda seed shall be hulled for warm
weather planting and unhulled for cool weather planting Punty of seed shall be a
minimum of 98 percent and germination shall be a minimum of 85 percent
27 Sit fence shall consist of NCDOT Class A fabric supported by wood or metal
posts spaced not more than 6 feet on center The bottom of the fabric shall be buried a
minimum of 6 inches
28 Gravel for check dams shall be #57 washed stone
07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall Z007/009
29 Aggregate for construction entrance shall be #4 washed stone
210 Stone rip rap for check dams and erosion control shall be NCDOT Class A or B
as shown
3 EXECUTION
31 General Take every practicable measure during construction or suspension to
work to minimize erosion and siltation Measures should include good construction
practices, temporary physical barriers to sediment travel, settling basins for new ditches,
and establishment of vegetative cover
32 Construction Practices
3 2 1 Avoid dumping sod or sediment into any wetland or watercourse
322 Maintain an undisturbed vegetative buffer where possible between a natural
watercourse and trenching and grading operations
323 Avoid equipment crossings of streams, creeks, and ditches where practicable
324 Grade all cut, fill and drtch slopes to minimum slope of 31, unless otherwise
shown or directed
33 Temporary Physical Barriers are required where sedimentation on off site
property or excessive erosion is a problem
3 3 1 Mulch shall be used for temporary stabilization of areas subject to excessive
erosion and for protection of seedbeds after planting where required
1 Apply grain straw and hay at a rate of 75 to 100 pounds per 1000 square feet
and wood chips at a rate of 500 pounds per 1000 square feet .lute and mesh
should be Installed as per manufacturer's instructions
2 Asphalt emulsion for slope stabilization should be applied at a rate of 1,000
gallons per acre Asphalt emulsion used for anchoring straw should be
applied at a rate of 150 gallons per ton of straw
3 3.2 Silt Fences shall be used at the base of slopes to restnct movement of sediment
from the site Clean silt fence of accumulated sediment after each rainfall event or
when it exceeds a depth of 0 5 feet above natural grade
333 Stone Check Dams, placed at the discharges of creeks, ditches, and swales,
shall consist of Class A or Class B erosion control stone at minimum two feet high and
07/05/2006 WED 16:49 FAX 99 343 9604 Norris, Kuske, Tunstall
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three feet thick across the watercourse, with a one foot thick layer of gravel on upstream
side Remove sediment if accumulated to a depth of 10 feet at upstream face
34 Vegetative Cover Establish and maintain permanent vegetative cover on all
unpaved areas disturbed by the work
341 Preparation of Seedbed Areas to be seeded shall be scarified to a depth of 4
inches and until a firm, well pulverized, uniform seedbed is prepared Lime, phosphorous
and ferblizer shall be applied during the scarrfication process to accordance with the
following rates
Lime 45 pounds per 1000 square feet
Phosphorous 20 pounds per 1000 square feet
Fertilizer 17 pounds per 1000 square feet
342 Seeding Disturbed areas shall be seeded with 2 to 3 pounds per 1000 square
feet of the specified seed mixture Seed shall be worked into the bed to a depth of 114
inch Regrade and seed eroded areas immediately
343 Mulch all areas immediately after seeding Mulch shall be applied and anchored
as specified hereinbefore. Reapply as necessary to retain cover until grass is
established
35 Construction Entrance Provide an aggregate drive, 20 feet wide by 50 feet long
by 6 inches thick at each entrance to the site used by construction vehicles, until such
time as the permanent roadway is constructed Remove soil if accumulated to a depth
greater than 0 5 inches
36 Maintenance The Owner and Contractor shall be responsible for maintaining all
temporary and permanent erosion control measures Temporary structures shall be
maintained until such time as vegetation is firmly established in the area protected by
the structure Permanent streambank protection and grassed areas shall be
maintained until completion of the project Areas that fail to show a suitable stand of
grass or which are damaged by erosion shall be immediately repaired
END OF SECTION
07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall
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STORMWATER SYSTEM & EROSION CONTROL NARRATIVE
OVERLOOK AT CAISON'S CREEK
HOLDEN BEACH, NORTH CAROLINA
For
Overlook at Caison's Creels, LLC
3105A Holden Beach Road
Supply, NC 28462
(910) 842-7898
July 2006
Prepared by
NORRIS, KUSKE & TUNSTALL CONSULTING ENGINEERS, INC.
902 Market Street
Wilmington, North Carolina 28401
(910) 343-9653
(910) 343-9604 (Fax)
NKT Project No 06072