HomeMy WebLinkAboutSW8051005_COMPLIANCE_20051103STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW ,
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
li
4,�lD
YYYYMMDD
STORMWATER SYSTEM & EROSION CONTROL NARRATIVE
BURGAW ELEMENTARY SCHOOL ADDITION
BURGAW, NORTH CAROLINA
For
Pender County Schools
925 Penderlea Highway
Burgaw, NC 28425
(910) 259-2187
Revised November 2005
October 2005
Prepared by
NORRIS, KUSKE, & TUNSTALL CONSULTING ENGINEERS, INC.
902 Market Street
Wilmington, North Carolina 28401
(910) 343-9653
(910) 343-9604 (Fax)
E-mail office@nkteng com
NKT Project No 05200
CF1VF_'D
NOV 0 3 2005
BY 1W_U16 6 n,
NARRATIVE
DESCRIPTION
The project site is a 13 93 acre tract located in Burgaw, NC Existing impervious
surface to remain on the property is 91,830 SF or 2 108 acres The sods of the site
consist of lightly vegetated, sandy clay topsoil and grades ranging from 0 5% to 2 0%
Approximately 9 0 acres will be graded to allow the expansion of the Burgaw
Elementary School 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
None of the existing impervious area to remain drains into the new retention pond
EROSION CONTROL MEASURES
The attached plans and specifications outline the requirements for erosion
control measures Silt fencing will be provided along each side of the entrance drive
where stormwater would be expected to sheet flow from disturbed areas directly to
adjacent property The detention pond will be used as a silt basin during construction
and restored to its design contours prior to completion 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 Pender 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 the stormwater detention
pond
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 detention pond/silt basin will
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
EROSION CONTROL NOTES AND MAINTENANCE PLAN
1 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 condition 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 / 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 No cut or fill slopes shall exceed a side slope of 1 vertical to 3 horizontal unless
otherwise specified on the plan All slopes shall be seeded and stabilized within
15 days
7 The stormwater ponds will act as sediment basins and will be cleaned out when
the level of sediment reaches 2 a ft below the top of the riser Gravel will be
cleaned or replaced when the sediment pool no longer drains properly
$ 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
9 More stringent measures shall be used to halt erosion if those shown on this plan
are not effective
10 All erosion shall be controlled including side slopes before the project is
completed
11 Remove temporary measures upon completion of project All permanent
measures will be well established before project closeout
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 clearing and grading operations
13 The Contractor shall, within 1
disturbing activities, provide permane
Temporary and permanent erosion car
economical, effective, and continuous
construction and post -construction period
permanent seeding
2 PRODUCTS
days of suspension or completion of land
it protective covering for disturbed areas
;rol measures shall be coordinated to assure
erosion and siltation control throughout the
Use the specified seed for both temporary and
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
24 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 grain Bermuda seed shall be hulled for warm
weather planting and unhulled for cool weather planting Purity of seed shall be a
minimum of 98 percent and germination shall be a minimum of 85 percent
27 Silt 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
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 soil 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 ditch 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 gram 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 Jute 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 restrict movement of sediment
from the site Clean sift 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
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
3 4 1 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 fertilizer shall be applied during the scarification process in 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 1/4
inch Regrade and seed eroded areas immediately
343 Mulch all areas immediately after seeding Mulch shall be applied and anchored
as specified herembefore 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
DETENTION POND ANALYSIS FILE NAME G 1DATAIWPDATAIWQSIPOND1051005 WK1
PROJECT # SW8 051005 REVIEWER R Gordon
PROJECT NAME Burgaw Elementary School Addition
DATE 01-Nov-05
Receiving Stream Osgood Branch Class C,Sw
Drainage Basin Cape Fear Index No 18-74-39-1
Site Area
Drainage Area
9 00 acres
I 1 8$02 00 Isquare feet
Area =
4 32 acres
IMPERVIOUS AREAS
Rational C
Buildings
4187000
square feet
095
Parking
59841 00
square feet
095
Sidewalks
298000
square feet
095
Future
815400
square feet
095
square feet
square feet
TOTAL 112845.00t
square feet
Rational Cc= 065
SURFACE AREA CALCULATION
% IMPERVIOUS
60 02%
SA/DA Ratio
7 00%
Des Depth
3
Req SA
13165 sf
TSS
90
Prov SA
17408 sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
Des Storm
1,00 inches
Rv=
059
Bottom
27 msl
Perm Pool
3i# i�Umsl
Design Pool
30 6 msl
Design SA
20796 sf
Req Volume
cf
9247]cf
Prov Volume
111
ORIFICE CALCULATION
Avg Head =
Flow Q2, cfs
Flow Q5, cfs
No of Orifices
Diameter, inches
Drawdown =
026 ft
0 054 cfs
0 021 cfs
1
2.00 weir HxW
2.0155 days
FOREBAY
Perm Pool Volume=
36985
Req Forebay Volume=
7397
Provided Volume=
867400
Percent=
23_v°la
SA @ _
Elevation=
Q2 Area =
Q5 Area =
Orifice Area
Q=
in
COMMENTS
Surface Area , Volume and Orifice are within Design Guideline:
3 15
sq in
1 26
sq in
3 14
sq in
0 053
cfs
x
I
in
roe a
re-
0\ ,, S
ic1l,ZA
JJ ���
STORTWATER SUBMITTAL REQUIREMENTS
DETENTION POND (cont)
B Calculations
1
2
3
4
5
6
7
8
9
10
11
12
13
85% or 90% TSS Chart noted
Pond depth
SAjDA ratio calculation
Required surface area at permanent pool
Provided surface area at permanent pool (Based on pond dimensions)
ProN ided surface area at temporary design pool
Required volume calculation
ProN ided volume calculation
Orifice size based on required 1" volume, using average head to design pool elevation
Desianer=s seal
Built -upon area to each pond
Forebay designed to hold 20% of the permanent pool volume (Range of 18-22 OK }
Non -erosive flow for 10 yr storm to the vegetated filter, if using 85% TSS
C Supporting Documentation
1 Completed permit application and supplement
✓ a. Is the person who signed the landowner or a leasee" Must be landowner
b All sections and blanks completely filled in
c Check signature per 1003 (e) Make sure title is provided
d If agent signs, signatory authorization from ov%ner
e Wet detention supplement sheet provided
f Mailing address & phone of applicant- no CIO
g Verify water body classification
h Justifications for not meeting a design requirement
i If a modification, include Designer=s Certification
J Hand initial design requirements
2 Proposed deed restrictions
V7, lfl0 �3S)
�2CLl Zo r 10g9C�
STORN4W,kTER SUBMITTAL REQUIREMENTS
DETENTION POND
A Site Plan
✓
1
Development/Project Name
2
Destgnei=s seal, signature, name and firm
_
3
Legend
4
North Arrow
5
Location Map with direction, distance to named streets, NCSR numbers
6
Scale
,%-
7
Date
8
Revision number and date
9
Original contours, proposed contours, spot elevations, finished floor elevations
10
Existing drainage, including off -site Provide a map of any offsite areas
11
Property/Project boundary lines, dimensioned
14�1�A
12
Mean High Water Line, if project is adjacent surface waters
13
catch basins, pipe sizes, inverts
14
Wetlands delineated, or a note on the plans that none exist Ponds may not be located
^�
in a wetland
15
Details of th. parking, ci ems , cluding side« alks, curb and gutter
t/
16
Drainage area to each pond delineated
�V_."
17
Dimensions of the permanent pool
la� r*
18
Vegetated filter detail if using 85% TSS This is NOT a connector ditch
19
Dimensions of the road, parking cul-de-sacs, sidewalks, and curb and gutter
20
Unit footprint with dimensions and concrete wood deck areas noted for apartments
or condo development
21
Forebay at each inlet (Prefer one inlet)
22
Inlets located such that entire pond is used for treatment and no short-circuiting
23
Pond/forebay section detail with
Bottom elevation
Permanent pool elevation PP
Storage pool elevation SP
Slopes 3 1 above permanent pool
Vegetated shelf located below permanent pool, 6 1 slope, «ith begin and end
elevations around main pond (Not required inside forebay)
Forebay bottom elevation, 3 1 slopes,
Forebay weir elevation between PP and DP
✓
24
Outlet structure detail with trash rack and onfice size specified Maximum trash rack
opening size is 4"
25
Note on plans that all roof drains must be directed so as to be picked up b} the pond
26
27
A 3 1 L W ratio has been pro\ ided for the pond
Maximum average pond depth of 6' (Parts of pond may be deeper -up to 7 5')
—�
28
Vegetation requirements for pond slopes and wetland species for the 6 ]shelf are listed
Weeping LoN e grass is not suitable for use in North Carolina
CAPE FEAR RIVER BASIN
Name of Stream Subbasm Stream Index Number Map Number Class
Osgood Branch
CPF23
18-74-39-1
I27SW8
C,Sw
Otter Branch
CPF17
1B-70-3-1
J26SEG
C,Sw
Otter Creek
CPF02
16-18-5-(1)
C21NE8
WS-II,HQW,NSW
Otter Creek
CPF02
16-18-5-(2)
C21SE2
WS-II,HQW,NSW,CA
Overcup Creek
CPF05
16-41-4-2-(1)
D22SE3
WS-IV,NSW
Overcup Creek
CPF05
16-41-4-2-(2)
D22SE6
WS-IV,NSW,CA
Owens Creek
CPF02
16-14-6-2
C21NE4
WS-II,HQW,NSW
Pages Creek
CPF24
18-87-22
J27SE9
SA,HQW
Paget Branch
CPF22
18-74-29-6-2
H27SW7
C,Sw
Panther Branch
CPF16
18-46-5
I24NW3
C
Panther Creek
CPF05
16-41-1-17-3
D23SW5
WS-IV,NSW
Panther Creek
CPF09
17-22-5
E20SW1
C
Panther Creek
CPF22
18-74-18
G27SE5
C,Sw
Panther Creek
CPF22
18-74-19-3
G26NW9
C,Sw
Parkers Creek
CPF05
16-41-8-(1)
D22SEB
WS-IV,B,NSW
Parkers Creek
CPF05
16-41-8-(2)
D22SEB
WS-1V,B,NSW,CA
Parkers Creek
CPF07
18-9
E23SW8
C,HQW
Parke Creek
CPF02
16-11-15
C20NE6
C NSW
Parkwood Branch
CPF10
17-30-5-4
F20NE9
C
Pasture Pond Branch
CPF17
18-66-3
J26SW9
C,Sw
Patchet Creek (Packet Creek)
CPF13
18-20-9
F22NE4
C
Patterson Branch
CPF15
18-31-19-3
G22SW3
C
Patterson Creek
CPF11
17-38-(1)
F22NW1
C
Patterson Creek
CPF11
17-3B-(2)
F22NW1
WS-IV
Pearces Mill Creek (McPieces Creek)
CPF15
18-30
G23SE7
C
Pedler Branch
CPF15
18-31-16
H22NW2
C
Peggy Island Creek
CPF23
18-74-36
I27SE5
C,Sw
Pemberton Creek
CPF16
18-48
I24SE2
C
Penwood Branch
CPF09
17-12-1
E19NE3
C
Persimmon Branch
CPF22
18-74-22
H27NW5
C,Sw
Persimmon Branch
CPF22
18-74-25-1
H27NE9
C,Sw
Persimmon Creek
CPF11
17-40-2
F22NW2
C
Persimmon Creek
CPF15
18-31-24-5-3
G23SW4
C
Persimmons Glade Branch
CPF10
17-30-5 5
F21NW5
C
Persimmons Nursery Branch
CPF04
16-30-2
022NW7
WS-IV,NSW
Peters Branch
CPF19
18-68-2-12-2-3
H25SE2
C,Sw
Peters Creek
CPF18
18-68-12-11
H24SE3
C,Sw
Pharisee Creek
CPF22
16-74-29-3-1-2
I26NW2
C,Sw
Philadephia Lake, Buffalo Lake, and White Oak
CPF02
16-11-14-1-2
C19SE2
C,NSW
Lake)
Phillips Creek (Bakers Lake)
CPF16
18-40
H23SE6
C
Phils Creek
CPF06
16-41-2-2-(0 3)
D22NW6
WS-II,HQW,NSW
Phils Creek
CPF06
16-41-2-2-(0 7)
D22NE7
WS-II,HQW,NSW,CA
Piedmont Creek
CPF02
16-11-14-2-1
C19SE5
C,NSW
Pike Creek
CPF23
18-74-46
J27NW3
C,Sw
Pine Branch
CPF04
16-28-6
D21SE2
C,NSW
Pine Hill Branch
CPF04
16-28-5-1
D21SW3
C,NSW
Pine Lake and Shadow Lake
CPF14
18-23-9
F21SE7
WS-III
Piney Bottom Creek
CPF15
18-31-4
G21NE9
C
Piney Branch
CPF17
18-77-3-1
K26NE6
C,Sw
Piney Mountain Creek (Little Creek)
CPF05
16-41-1-8
C22SE9
C NSW
Piney Point Creek
CPF17
18-88-9-2-4
L26NEB
SA,HQW
Pistol Branch
CPF14
18-23-29-4
F23SW7
C
Players Creek
CPF23
1B-74-49-2-2
J27NE5
C,Sw
Plum Branch
CPF16
18-50-2
I24SE2
C
Plummers Run
CPF16
18-57
J25NW6
WS-IV
Pocket Creek
CPF11
17-37-0 3)
F21NE9
C
Page 20 of 28
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