SW8990927_COMPLIANCE_20030130

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

-
- - I )btQ)
1, Project Description
Design Calculations
Infiltration System
for
Bargain Beachwear — Surf City, N.C.
January 15, 2002
(Revised April 15, 2002, May 14, 2002)
The proposed site is located in Surf City on NC 201/50 just east of the bridle over the Intercoastal Waterway.
The site includes a total of 2.25 acres and is currently in an undeveloped state.
Disturbed area will be limited to less than 0.5 acres therefore a land disturbance permit from NCDENR will not
be required. However, as bulkhead construction requires a CAMA major permit, stormwater permitting
through NCDENR is required.
2. Design Requirements
Project will be designed in accordance with NC Administrative Code Section 15A NCAC 2H.1000 —
Stormwater Management. This site is in the category of "development activities within one-half mile of and
draining to SA waters or unnamed tributaries to SA waters". Due to proposed impervious areas, the project is
considered "high density development". In accordance with regulations, an infiltration system designed to
accommodate 1-1/2" of rainfall will be required. Furthermore, runoff in excess of the design volume must flow
overland through a vegetative filter. In accordance with "high density" requirements, runoff from all
impervious surfaces, including existing, must be treated.
3. Impervious Drainage Areas
Existing Impervious Area -
0 SF
On -site Buildings —
On-site Streets —
7,562 SF
0 SF
RECEIVED
On -site Parking —
8,902 SF
On -site Sidewalks --
744 SF
Other On -site —
301 SF
JAN 3 0 2003
Off -site -
0 SF
DW
Total 17,509 SF PROJ #�
Total Project Area 39,924 SF
Percent Impervious 43.9%
4, Run-off Volume
Runoff Volume = 17,994 sf(use total drain area — conservative) x 1.5"/12
= 2,249 cf

w"N"Ou
"ITT NO?

5. Unit (per foot) Volumk-Qf System
Unit volume of pipe
Unit volume of trench
Unit volume of system (pipe & trench)
6. Required Lenuth
Lengthen; u,. = 2,249 cf / 11.96 cf/ft
= 188'
Length�,,;d = 188'
7. Drawdown Time
=3,14cf/ft
= ((9' x 2.8') — 3.14) x 0.4 (stone porosity)
= 8.82 cf/fi
= 8.82 cf + 3.14 cf
= 11.96 cf/ft
Assume soil hydraulic conductivity of 0.52 in/hr:
Drawdown Time = Runoff Volume x 12 / (Areapv;&,j x 0,52 in/hr)
— (2,249 cf x 12) / ((188' x 9') x 0.52 in/hr)
= 30.7 hours (1.3 days) o.k., < 5

Project: Eagles Beachwear
By: DKN
Procedure:
Adjust y until zav = zreq
Where:
B = bottom width
y = trial depth
A = By + My2
P = B + 2y(1+M2)112
R=AIP
z� = ARC
Use:
n = .02 for earth lined
n = .03 for mowed grass
n = .05 for unwowed grass
n = .013 for concrete lined
Let:
Swale Calculations
n = 0.03
M = 1
Location Q,o 5 z"q B y A P R z.,, -VEL
peg filters 1.40 0 00 0:45 4 0.27 1.15 4.76 0.24gitft
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Y.:
5
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1''0�6�racoddp0p Design Calculations M - '`L'� 1%
�y� Infiltration System 13
AY 2ooz
ES �� for
SE L r Bargain Beachwear — Surf City, N.C.
�8
i8 S - January 15, 2002
'N�� (Revved April 15, 2002, May 14, 2002) V
1. Proiecctt/Description
The proposed site is located in Surf City on NC 201/50 just east of the bridge over the Intercoastal Waterway.
The site includes a total of 2.25 acres and is currently in an undeveloped state.
Disturbed area will be limited to less than 0.5 acres therefore a land disturbance permit from NCDENR will not
be required. However, as bulkhead construction requires a CAMA major permit, stormwater permitting
through NCDENR is required.
2. Design Requirements
Project will be designed in accordance with NC Administrative Code Section 15A NCAC 214,1000 —
Stormwater Management. This site is in the category of "development activities within one-half mile of and
draining to SA waters or unnamed tributaries to SA waters". Due to proposed impervious areas, the project is
considered "high density development". In accordance with regulations, an infiltration system designed to
accommodate 1-1/2" of rainfall will be required. Furthermore, runoff in excess of the design volume must flow
overland through a vegetative filter. In accordance with "high density" requirements, runoff from all
impervious surfaces, including existing, must be treated.
3. Impervious Drainage Areas
Existing Impervious Area - 0 SF
On -site Buildings —
7,562 SF
On -site Streets —
0 SF
On -site harking —
8,902 SF
On -site Sidewalks
744 SF
Other On -site —
301 SF
Off -site -
0 SF
Total 17,509 SF
Total Project Area 39,924 SF
Percent Impervious 43.9%
4. Run-off Volume
Runoff Volume = 17,994 sf (use total drain area — conservative) x 1.5"/ 12
= 2,249 cf

J 0
a
5. Unit (per foot) Volume of System
Unit volume of pipe
Unit volume of trench
Unit volume of system (pipe & trench)
6. Required Length
Lengthminicnum = 2,249 cf / 11.96 cf/ft
= 188'
Lengthprovided = 188,
7. Drawdown Time
= 3.14 cf/ft
= ((9' x 2.8') — 3.14) x 0.4 (stone porosity)
= 8.82 cf/ft
= 8.82 cf + 3.14 cf
= 11.96 c6ft
Assume soil hydraulic conductivity of 0.52 in/hr-.
Drawdown Time = Runoff Volume x 12 / (Area,.,,,,ided x 0.52 in/hr)
(2,249 cf x 12) / ((188' x 9') x 0.52 in/hr)
30.7 hours (1.3 days) o.k., < 5

ii
ty'09-02 10:24A RICHARD A JORDAN & ASSOC_ 910 327-2136 P.01
13-A c#-j
Rchard :A. Akwiderha
141 Sugar Lana • Post Office Box 301 - Sneads Ferry, North Carolina 28460 • [phone] Fax [phone]
FAn CO VER SHLET
DATE:
TO.• _ ICiC� S r ue 2.
FROM. 1�JC�ig 0kd
FAX #. -WO r 35 0 - 2 0
# DFPAGES INCL UDING COVER SHEET 3 _
COM fE`NTS Ke 3A2 /,u %
SUP.

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May-10'9-02 10:24A RICWARO A JORDAN & ASSOC_ 91.0 327-2136
P_03
NON -WO, -,EN GEOTExTILE
FABRIC
24' PERFORATED PYC
PIPE (CONTECH A-200
OR EoUAL)
NO. 57 CLEAN _
WASHED STONE
WRAP STONE IN
NON--VADVEN CEO -
TEXTILE FABRIC
4' (MIN) CLEAN
SAND LAYER
FLOW
b'ADC STONE ILL x`
�v 2 - t0.4
SYSTEM TOP
�ELEY 9.4
�•i a°e°e a°�'°a°i°i°s wP1PE IN
TT
Y
OsOovSa�a� a o° °eeee°v �.
• e • . • ° ° ° • °e° -r SYSTEM BOTTOM
�IERV r4
�' 1 fl 11 III
2' MIN. SEPARATION
GROUNDWATER ELEyAT10N Sj OELE.1LZ}
(Ptn D°O LEI Ti DATED 41VW)
SUBSURFACE STORMWATE_�
INFILTRATION TRENCH
NUT TO SCALE
5

Project Name: eorgQ rl &e2Ch wea— Location: Hwy So[Z1y SWC,
0"
DIVISION OF WATER QUALITY 061
2&J 2Ce1,4 Ace �a,e
INFILTRATION SYSTEM INVESTIGATION &
1. The minimum bore depth:
Existing ground elevation: %
Proposed Bottom elevation:
Add 2' +2 +2 2 +2
Depth:
2. The type of soil: S o-ild52
3. The expected infiltration rate:_
0'ev. Of
4. Tim -the Seasonal High Water Table: 2,
5. Additional comments: fM .Fy' CC'17 3 f "' Z
el zl,
Signature of Regional Office Personnel:
Linda Lewis, DWQ . _ _ _ Vincent Lewis. Sol] Scientist
Permit Application No. Date
S:1WQSISTORMWAT\ ORMSIINFINVST.FOR

]RECEIVED
Permit Na.
t4ov 2 2 1999 State of North Carolina
By: epartment of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
Oo be provided by DWQ)
UNDERGROUND INFILTRATION TRENCH SUPPLEMENT
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
underground infiltration trench supplement for each system, design calculations, and plans and specifications
showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name:
The Causeway
Contact Person: Gordon R . McAdams, P.E. phone Number: ( 91 0) 4 5 5 - 2 41 4
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench 1 in Drainage Area 1 --
(from plans) (from Form SWU-101)
II. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type
SAND
Infiltration Rate
3 -1 2
in/hr r ef/hr/sf (circle appropriate units)
SHWT Elevation
1 -5 •
fmsl (Seasonal High Water Table elevation)
Trench Design Parameters
Design Volume
2151
c.f.
Design Storm
1.5
inch event (1.5 inch event for SA waters, 1 inch event far others)
Drawdown Time
7 hours
days
Perforated Pipe Size
24
inch diameter
Perforated Pipe Length
1 5 0
ft.
No. Observation Wells
0
(may he required on a case -by -case basis)
Stone Type (if used)
#57
Stone Void Ratio
40%
*No Soil Borings taken dn'this property
Soils assumed to equal those directly
Trench Elevations (in feet mean sea level) across Hwy 210 on Treasure Coast
Yaucht Club project. Same data used.
Bottom Elevation 2.5 fmsl
Storage/Overflow Elevation 6.5 fmsl
Form S W U- l07 Rev 3.99 Page I of 4

Trench Dimensions
Height 4 ft. Length 150 ft.
Width 8 ft. Volume Provided 2202 cu.ft.
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N.C.
Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15
A NCAC 2H .1008.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. Attach justification if a requirement has not been met.
Applicants Initials
6'
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is located at least 100 feet from water supply wells.
c. Bottom of system is at Ieast 2 feet above the seasonal high water table.
GN—
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e. Off-line system, runoff in excess of the design volume bypasses the system (bypass detail
provided). Overflows catch basins
611
f. System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days based upon infiltration
through the bottom only (a hydrogeologic evaluation may be required).
.6 ^'—
g. Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
N °
h. System is not sited on or in fill material or DWQ approval has been obtained.
6 -
Site filled years ago and new fill will be added
i. Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once the project is complete and the entire drainage area is
stabilized.
j. System is sized to take into account the runoff at the ultimate built -out potential from all
surfaces draining to the system, including any off -site drainage.
k. System is located in a recorded drainage easement for the purposes of operation and
maintenance and has recorded access easements to the nearest public right-of-way.
60 —
1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event
for areas draining to SA waters ). 1 . 5 i n .
m. Drainage area for the device is less than 5 acres.
/V0
n. A pretreatment device ( filter strip, grassed swale, sediment trap, etc.) is provided.
G"
o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
^—
P. Sides of the infiltration trench are lined with geotextile fabric.
G^"'
q. Rock used is free of fines (washed stone) and has a large void ratio.
6"-
r. Side to bottom area ratio is less than 4:1.
*Located in parking lot which is owned by Miles McCormick
Form SWU-107 Rev 3.99
Page 2 of 4

k
ro s. Observation well(s) are provided (case -by -case basis).
NU
G"—
t. Vegetated filter is provided for overflow (50 feet for SA waters, 30 feet for other waters) and
detail is shown on plans.
1, ,
U.
A benchmark for checking sediment accumulation is provided. ( Mark in
Catch Basin 6 in. from bottom)
IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT
After every runoff producing rainfall event and at least monthly inspect the bypass/overflow structure for
blockage and deterioration and the infiltration system for erosion, trash accumulation, grass cover, and general
condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash and blockageg as needed to maintain
system performance.
3. Remove accumulated sediment annually or when depth is reduced to 75% of the original design depth. Restore
depth to original design depth without over -excavating. Over -excavating may cause the required water table
separation to be reduced and may compromise the ability of the system to perform as designed.
4. The water level in any monitoring wells will be recorded after a I inch rainfall event and at least once a.month.
Chronic high water table elevations (within 1 foot of the bottom of the system for a period of three months)
shall be reported to DWQ immediately.
5. If DWQ determines that the system is failing, the system will immediately be repaired or replaced to original
design specifications. If the system cannot be repaired to perform its design function, other stormwater control
devices as allowed by NCAC 2H .1000 must be designed, approved and constructed.
6. Remove accumulated sediment from the infiltration system annually or when depth in the unit is reduced
to 75% of the original design depth. The system shall be restored to the original design depth without
over -excavating. Over -excavating may cause the required water table separation to be reduced and may
compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in
an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e.
stockpiling near a stormwater treatment device or stream, etc.).
A benchmark shall be established in the infiltration system. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used
to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
When the depth at the benchmark reads 4.0 , the accumulated sediment shall be removed
from the system.
Form SWU- 107 Rev 3.99 Paae 3 of 4

I acknowledge and agree by my signature below that I am responsible for maintaining the stormwater
collection system in accordance with the six maintenance procedures listed above. I agree to notify DWQ
of any problerns with the system or prior to any changes to the system or responsible party.
Print Name and Title: Miles McCormick, Owner
Address: 513 Roland Avenue, Surf City, NC _28443
Phone:
Signature:
Date. ----
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and
a resident of the subdivision has been named the president.
1, lz)�, ti X - 14 , a Notary Public for the State of �1 CkA&,-eounty of
do hereby
'certify
,that _ i'1.cc.G.��- %hC CA1IJVe:-6 -- personally appeared before me this
6 .lam day of UC 7 � ` `% �7 and acknowledge the due execution of the forgoing infiltration
basin maintenance requirements. Witness my hand and official seal,
SEAT, My commission expires 1 D `�---208
Form SWU-107 Rev 3.99 Page 4 of 4