SW8060808_COMPLIANCE_20060810

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW_eaiz_oA
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

DETENTION POND ANALYSIS FILE NAME: G:\DATA\WPDATA\WQS\POND1060808.WKI
PROJECT #- SW8 060808 REVIEWER: P.Bartlett
PROJECT NAME: Westport FS
DATE:
Receiving Stream: UT Brunswick R. Class:
Drainage Basin: Index No.
Site Area 1.65 acres
Drainage Area square feet Area
IMPERVIOUS AREAS
OB Bldgs
OS Sts
OS prkg
OS sidewalks
TOTAL
SURFACE AREA CALCULATION
1 O-Aug-06
Sc
18-77
1.65 a
Rational C
9850.00
square feet
0.95
8000.00
square feet
0.95
12000.00
square feet
0.95
2000.00
square feet
0.95
square feet
square feet
square feet
Rational Cc= 0.53
% IMPERVIOUS
44.31%
SA/DA Ratio
3.10%
Des. Depth
5
Req. SA
2230 sf
TSS:
90
Prov. SA
'€iO4a sf
VOLUME CALCULATION
Rational ?*
Des. Storm
inches
Rv=
0.45
Bottom
10 msl
Perm. Pool
msl
Design Pool
15.9 msl
Design SA
3840 sf
Req. Volume
88cf
;l
Prov. Volume
053 Cf
ORIFICE CALCULATION
* place a "'I" in the box if Rational is used
FOREBAY
Perm. Pool Volume=
Req. Forebay Volume=
Provided Volume=
Percent=
SA @ = 500
Elevation= 10
8750
1750
2000.00
3000 3840.00
15 15-90
Avg. Head = 0.43 ft Q2 Area = 0.71 sq. in.
Flow Q2, cfs 0.016 cfs Q5 Area = 0.28 sq. in.
Flow Q5, cfs 0.006 cfs Orifice Area 0.44 sq. in.
No. of Orifices
Q=
0.010 cfs
i n X in
Diameter, inches weir H x W
Drawdown = days
COMMENTS
Surface Area , Volume and Orifice are within Design Guideline:

1%,Rug 11 06 11:01a
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19102512208
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in
TANGLE
ENGINEERING, P.C.
212 Princess Street • Wilmington, North Carolina 28401 • Tel_ [phone] • Fax [phone] • email: [e-mail]
FACS[h11LE TRANSMITTAL SHEET
TO: FROM:
PC, rfxIrT - k
COMPANY: DATE:
NC- D rJ�-
F[UXC NUMBER: TOTAL NO. OF PAGES INCLUDING COVER:
aS_d 'Z00- _ -
RE: SENDER'S REFERENCE NUMBER:
SOT7 S I CONWENTS:
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8/10/2006

Jun 15 06 04:27p Rae Pc 19102512208 p.2
NCDENR
North Carolina Department of Environment and Natural Resources �A4
127 Cardinal Drive, Wilmington NC 28405 [phone] FAX [phone] s
Request for Express Permit Review
FILL-IN all information below and CHECK required Permit(s).
FAX or email to Cameron. Weaver(@ncmail.net along with a narrative and vicinity man of the project location.
Projects must be submitted by 9:00 A.M. of the review date, unless prior arrangements are made.
APPLICANT Name Town of Leland
Company Town of Leland
Address 102 Town Hall Drive CitylState_LeIan d Zip_28451_ County —Brunswick
Phone [phone] Fax [phone] Email
PROJECT Name -Westport Fire Station
PROJECT SYSTEM(S) TRIBUTARY TO (STREAM NAME) _Cape Fear RIVER BASIN
ENGINEER/CONSULTANT Shane Lippard, PE
Company Right Angle Engineering
Address_212 Princess Street City/State—Wilmington, NC_Zip_28401 County_New Hanover
Phone_251-8544 Fax_251-2208 [e-mail]
--------------------------------------------------------------------------------------------------------------------------------------
State or National Environmental Policy Act (SEPA, NEPA) - EA or EIS Required ❑ Yes ® No
--------------------------------------------------------------------------------------------------------------------------------------
❑ STREAM ORIGIN Determination; # of stream calls; Stream Name
❑ STORMWA TER
❑ Low Density ® High Density -Detention Pond ❑ High Density -Other
Wetlands MUST be addressed below ❑ Low Density -Curb & Gutter ❑ High Density -infiltration ❑ Off Site
---- ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
❑ COASTAL
❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information
MANAGEMENT
❑ Upland Development ❑ Marina Development ❑ Urban Waterfront
® LAND QUALITY
® Erosion and Sedimentation Control Plan with _1.5 acres to be disturbed.
---------------------------------------- ----------------------------- -- -------- = =,--------------------------------------------------------------- --ram -------
WETLANDS (401) Wetlands on Property ❑ Yes No Isolated Wetlands on Property Elyes'®,No
Check al th_ at_appi
Wetlands Will Be Impacted -El Yes ❑ No Wetland Impacts: Acre(s)
Wetlands Delineation has been completed ❑ Yes ❑ No ❑ Buffers Impacted: Acre(s)
USA COE Approval of Delineation completed ❑ Yes ❑ No
404 Application in process wIUSACOE ❑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 the original Express Review permit application fee, may be charged for
subsequent reviews due to the insufficiency of the permit applications.
For DFNR use only
SUBMITTAL DATES: Fee Split for multiple permits:
SW S
CAMA $
LQS $
401 $ Total Fee Amount $

Jun 15 06 04:27p Rae Pc
19102512208
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FIRM STATION
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Jun 15 O6 04:2'!p Kae rc 1%11JL.11LLl1Cl r •� _
1. Proie_ct Description: The Project is proposed to be construction o\ 10, 00 1200
square foot fire station structure, concrete entrance drives, asphalt parking�areas,_storm
drainage, water, and sewer. The land disturbing activity associated with the project will
consist of clearing and grubbing of vegetation, preservation of existing trees, grading of
the site, and sediment and erosion control measures such as a silt fence, gravel
construction entrance, and a check dams. Also included in the project will be storm
piping to collect the parking drainage and direct it to the wet detention pond. The total
area which will be disturbed for this project is 1.6 acres. Total impervious area will be
40,000 SF (0.92 AC) for the proposed construction.
2. Site Description: The project site is in Brunswick County, NC, located on
Highway 133 just south of the entrance to Westport Subdivision. The property on which
the development will take place is currently owned by the Town, of Leland.
On site soils consist mainly of Leon and Baymeade soils. These soils are mainly loamy,
fine sands.
General slope of the site is from west to east towards the front of the site.
Land use in the vicinity is residential and rural agricultural.
3. Adjacent Property: The areas adjacent to the project site are residential areas.
4. Drainage Considerations: There are three major drainage features existing on
the site. The site is mostly flat with slight slope from west to east. A large natural
drainage area exists behind the property and drains under Highway 133. A 36" concrete
pipe under Highway 133 carries the drainage across the roadway and into an existing
drainageway to Jackies Creek.
The road and parking areas will be bounded with curd gutter to�curb inlet collection
basins. The curb inlets will be piped to two entrances into the forebay of the wet
detention basin. Both of the entrance pipes to the basin will be 18" diameter. The runoff
from the buildings will be directed into the collection system and sent to the basin. The
basin is sized to provide sufficient runoff capacity filtration for the entire allowable
impervious area. The wet detention basin is to provide detention of the pre -construction
and past -construction runoff difference and meet the 90% TSS water quality
requirements. The amount of retention was based on the Type III rainfall distribution of
the 25 year, 24-hour storm, Calculations are provided.
5. Erosion Control Considerations: The following erosion control measures are
used on this project:
Temporary Gravel Construction Entrance/Exit
To prevent sediment from leaving the site, temporary gravel construction entrances
should be installed where the access road enters the site and instersects with
Village. For dimensions and specifications, see construction details.
Westport Fire Station
June?006

Jun 15 06 04:27p Rae Pc
iaiuenleeua
2. Land Grading
The existing slope of the site is from south to north towards the front of the parcel.
Most of the disturbed areas on the site will sheet flow to the existing drainage
patterns on the site.
3. Silt Fence
Silt fence should be installed prior to clearing and grading activities. Silt fence
should be checked routinely. If needed, silt fence should be cleaned and replaced
if damaged. See Construction Detail for dimensions and specifications.
4. Wet Detention Basin
A wet detention basin will be constructed for long term runoff pollutant control, and
this area will be used as a sediment basin during construction. Outlet control
structure with rip rap energy dissapator will be installed when basin is excavated
and 30' sodded vegetated filter will be placed after the rip rap to provide additional
filtering prior to discharge into the existing wetland.
6, Construction Schedule:
1. Obtain plan approval and other applicable permits.
2. Hold pre -construction meeting at least one week prior to beginning construction.
3. Install temporary construction entrance/exits.
4. Before clearing and grading of the site, install silt fencing, detention basin with outlet
structure, and clean and replace as necessary.
5. Begin clearing and grading of the site.
6. Install storm piping.
7. Install new roadway.
8. Sod/Seed, mulch, and tack immediately to establish proper vegetation.
9. All erosion and sediment control practices will be inspected weekly and after each
rainfall event. Needed repairs will be made immediately.
10, After the entire covered area is stabilized, all temporary measures wili be removed
and permanent vegetative repairs to be completed.
7. Vegetation Plan:
1. After complete stabilization of the entire covered area, top cover soils will be
roughened by making 1"-2" deep grooves perpendicular to the slope,
Westport Fire Station
Rine 2006

Jun 15 06 04:27p Rae Pc 1�j1UCz)ICCU❑ P,.r
2. Spread lime (agricultural limestone) evenly over the area at a rate of 1.5 tons/acre;
spread 10-10-10 fertilizer at a rate of 1000 lb/acre and incorporate into the top 6" of
soil.
3. Loosen surface prior to applying seed.
4. Broadcast seed at recommended rates.
5. Rake seed into the soil and lightly pack to establish good contact.
6. Mulch with 4000 lb/acre grain straw or equivalent and anchor by weighted farm disc
set nearly straight or other mulch anchoring tool.
7. Mow as needed and refertilize in late winter or early spring by topdressing with 10-
10-10 fertilizer.
8. Graded surfaces shall not be exposed without grass coverage for more than 15
days. If grades are not complete and exposure is more than 15 days, temporary
seed with rye grain at 50 lb/acre.
8. Maintenance Plan:
1. Contractor shall maintain all sedimentation and erosion control devices during
construction.
2. All devices shall be checked after each rain event and weekly. Repairs shall be
made immediately when detected.
3. Any deficiencies shall be brought to the immediate attention of the Engineer.
Seed Types and Application Rate ! Schedule
Temporary Seeding
Grass Tye
Amount / 1000 SF
Time of Seeding
Initial
Rye Grain
1-2 Ibs
Nov. — Jan_
25 Ibs 10-10-10
Brown Top Millet
1-2 Ibs
June— Aug.
25 Ibs 10-10-10
Permanent Seeding
Grass Type
Amount
Time of
Initial
Fertilization 1
Fertilization 1
Fertilization 1
/1000
Seeding
1000 sf
1000 sf
1000 sf.
sf
Maintenance
Maintenance
maintenance
Burmuda,
1-2 Ibs
Apr. —
25 Ibs
March -April
Each 4-8
Aug. -Sept.
Common
June
10-10-10
121bs
Weeks
12lbs
Westport Fire Station
June 2006

Jean 15 06 04:28p Rae Pc
IUlUeblecfu i p.n
a
10-10-10
1-2 Ibs N.
10-10-10
Fescue, Tall
5-7 Ibs
Sept. —
25 Ibs
Feb -March
May & Dec.
Sept. -Oct.
(Kentucky
Oct.
10-10-10
12 Ibs
'/z to 1 lb. n.
12 Ibs
31)
Feb. —
10-10-10
10-10-10
Oct.
Sericea
1-2 Ibs
March —
25 Ibs
Feb -March
'/z to 1 Ib. N,
I NIA
Lespedeza
Apr.
10-10-10
(Slopes)
'" Bermuda Sod Where shown on the plans.
lNIiI@Xf1A,A_VI
Westport Fire Station
Iiinc 2006

Jun 15 06 04:26P Rae Pc 19102512208 P.1
1
■
■
PIGHT ANGLE
ENGINEERING. P.C.
212 Princess Street • Wilmington, North Carolina 28401 • Tel. [phone] • Fax [phone] email: [e-mail]
FACSIMILE TRANSMITTAL SHEET
C:CJMP? IN Y
/IS
FAX N -LAMER: TOTAL N . OF PA AS INCLUDING COVER
�r� -moo V
RE:
NOTES/ COMML• NITS:
SENDER'S REFERENCE NUMBER
Gc,4Z
i
r �
kJ-14-64

Jun 15 06 04:27p Rae Pc
IS102512208
DESIGN NARRATIVE FOR HIGH DENSITY PROJECT
FOR
TOWN OF LELAND WESTPORT FIRE STATION
BRUNSWICK COUNTY, N.C.
June 2006
TABLE OF CONTENTS
1.0 PROJECT DESCRIPTION
2.0 SITE DESCRIPTION
3.0 ADJACENT PROPERTY
4.0 DRAINAGE CONSIDERATIONS
5.0 EROSION CONTROL CONSIDERATIONS
6.0 CONSTRUCTION SCHEDULE
7.0 VEGETATION PLAN
8.0 MAINTENANCE PLAN
APPENDIX
WET DETENTION BASIN CALCULATIONS
IMPERVIOUS AREA TOTALS
RUNOFF CALCULATIONS
PIPE CALCULATIONS
Westport Fire Station
Junc 2006