SW8970305_COMPLIANCE_20070823

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW Gy�,rj
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE,
YYYYM M D D

Michael F. Easley, Governor
o�o� W A r�qp�
August 23, 2007
Mr. Jon T. Vincent, Owner
Gulf Stream Shopping Center
1508 Military Cutoff Road, Suite 302
Wilmington, NC 28403-5730
Subject:: Stormwater Permit No. SW8970305
Gulfstream Shopping Center
New Hanover County
Dear Mr. Vincent:
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural ReSOlneeti
Coleen H. Sullins Director
Division of Water Quality
The Division of Water Quality issued a Coastal Stormwater Management Permit, Number
SW8970305 to Gulf Stream Shopping Center, for a High Density Stormwater pond to serve the
Gulf Stream Shopping Center on 7/17/1997. This permit expired on 7/17/2007.
Section .1003(h) of 15 A NCAC 2H .1000 (the stormwater rules) requires that applications for
permit renewals shall be submitted 180 days prior to the expiration of a permit and must be
accompanied by a processing fee, which is currently set at $420.00. If this is still an active
project please complete and submit the enclosed renewal application in a timely manner. If this
project has not been constructed and a permit is no longer needed, please submit a request to
have the permit rescinded. If you have sold the project, or are no longer the permittee, please
provide the name, mailing address and phone number of the person or entity that is now
responsible for this permit. Enclosed is a form for change of ownership, which should be
completed and submitted if the property has changed hands.
Your permit requires that upon completion of construction and prior to operation of the
permitted treatment units a certification of completion be submitted to the Division from an
appropriate designer for the system installed. This is to certify that the permitted facility has
been installed in accordance with the permit, the approved plans, specifications and supporting
documentation. Please include a copy of the certification with your permit renewal request and
processing fee. Enclosed is a copy of a sample certification. Also enclosed is a new Operation
and Maintenance agreement that should be completed and submitted along with your renewal
application.
You should be aware that failure to provide the Designer's Certification and the operation of a
stormwater treatment facility without a valid permit, are violations of NC General Statute 143-
215.1 and may result in appropriate enforcement action including the assessment of civil
penalties of up to $10,0 �6 per day.
If you have any questions, please feel free to contact staff in the stormwater group at
910-796-7215.
Sinc ly,
t/Stz-4'
Ed Beck, Regional Supervisor
Surface Water Protection Section
Wilmington Regional Office
Enclosures
No thCarol ina
cc: Wilmington Regional Office 111alurally
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone [phone] Customer Service
Wilmington Regional Office Intemet: www.ncA,ateriluality.ora Fax [phone]
An Equal OppolunitylA(firmative Action Employer— 50% Recycled110% Post Consumer Paper

Michael F. liaslcy, Governor
�CF W A T4S;gQ
�O G
7
February 12, 2008
Mr. Jon T. Vincent, Owner
Gulf Stream Shopping Center
1508 Military Cutoff road, Suite 302
Wilmington, NC 28403-5730
Notice of Inspection -NON-COMPLIANCE STATUS
Gulfstream Shopping Center
Stormwater Project No. SW8970305
New Hanover County
Dear Mr. Vincent:
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen 11. Sullins Director
Division of Water Quality
Please find attached a copy of the completed form entitled "Stormwater Compliance Inspection
Report". The report summarizes the findings of a recent inspection of the project's stormwater
controls conducted on February 1, 2008 to determine compliance with Stormwater Permit
Number SW8970305 issued on July 17, 1997.
The required actions that are necessary to bring this site into compliance are noted under the
Comments section of the report. Please inform this Office in writing within fifteen (15) days of
the specific actions that will be undertaken and the time frame that will be required to correct
the deficiencies. Failure to provide the requested information, when required, may initiate
enforcement action. If you have any questions please contact David Cox at the Wilmington
Regional Office, telephone number [phone].
Sincerely,
Pat C. Durrett
Environmental Specialist
PCD/encl: SAWQSISTORMWATIINSPECT1Pats inspections\SW8970305 cov Itr
cc: Wilmington Regional Office
nc
NoSthCarolina
,11aturn!!y
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone [phone] t5 Cusiomer Service
Wilmington Regional Office Internet: www.ncwaleruuality.oFax [phone] 1-977-623-6748
An Equal Opportunity/Affirmative Action Employer— 50% Recycled110% Post Consumer Paper

HIGH DENSITY
STATE STORMWATER INSPECTION REPORT
Project Name: _ Gulfstream Shopping Center Permit No: SW8970305 Exlpiration date: 7117107
Contact Person: Jon T. Vincent Phone No:
County: New Hanover Center of Project GPS: Lat: 340 19' 55.61 "N Long: 770 45' 02.02 "W
Facility Address: .5315 S. College Rd. _ _ Cam: Wilmington Zip: 28412
(If multiple basins exist, specify basin(s):
Entry time: 12:00 am ❑ pm ® Exit time: 12:40 - am ❑ pm ® Date: 2-11/08
Method of Treatment: (check one) ® Wet Detention ❑ Dry Detention ❑ Bioretention ❑ Wetland ❑ Sandfilter ❑ Swale
❑ Pocket Wetland ❑ Level Spreader ❑ Permeable Pavement ❑ Infiltration Basin Other: ❑
Receiving Waters: UT to Cape Fear . Classification: SC River Basin: Cape Fear
GENERAL QUESTIONS FILE REVIEW
1. A signed copy of the Engineer's certification is in the files:
2. A signed copy of the Operation & Maintenance Agreement is in the files:
3. A copy of the recorded deed restrictions is in the files:
SITE VISIT
1. Drainage area is consistent with the permit:
2. Built -upon area to drainage area is consistent with the permit:
3. All built -upon area (as permitted) is graded such that the runoff drains to the system:
4. The outlet structure is located per the approved plans:
S. The trash rack is provided on the outlet/bypass structure:
6. The trash rack is free of debris and excess trash:
7. All slopes are grassed with permanent vegetation:
8. Vegetated slopes are no steeper than 3:1
` 9. The inlets are located per the approved plans and do not cause short-circuiting of the system:
YES NO NA NE
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0
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0

YES NO NA NE
10.
Access points are clear and well maintained:
®
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11.
Forebay is free of excessive sediment:
®
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12.
Banks are stable with no erosion present:
®
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13.
Vegetation and trash have been removed as needed:
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®
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14.
Drawdown device is correctly sized per the approved plans: *verify
®
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15.
Grass is mowed (not scalped) as required:
®
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16.
All required parts of the system are provided (such as vegetated shelf and a Forebay):
®
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17.
The Swale or outlet bypass is in the correct place and is in good condition:
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®
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18.
Vegetated shelf is 6:1 and properly vegetated:
®
❑
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19.
Invasive species/tree control is provided as needed
®
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20.
Tree pruning, mulch and plant replacement are provided as needed in the bioretention basin:
❑
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®
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21.
permeable pavement has had regular sweeping and vacuuming:
❑
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®
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22.
Gravel replacement is performed as needed:
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23.
Excessive landscape debris (grass clippings, leaves, & sediment) are controlled:
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24.
Large stemmed vegetation is kept off of the level spreader:
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25.
Sediment and debris is removed from behind the lip of the level spreader on a routine basis:
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26.
Maintenance records are available for inspection: -
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S

COMMENTS: each NO answer should have a comment
1. Your permit expired on 7/17/07. To date, this Office has not received a renewal request. Operation of a system without a
valid permit is a violation. You must at once, submit your renewal as required.
2. A signed copy of the Engineer's certification has not been submitted as required. This must be provided with your renewal
request, also, a signed copy of the new Operation and Maintenance form should be provided.
3. Overall the site looked good. The trash rack has been bent and should be repaired. Some trash was evident on the rack and
the surrounding area that should be removed.
4. * The orifice size should be checked. The permitted size is a 1" opening. Please verify that this is correct.
S. No maintenance records were available on the inspection date. You are reminded that records must be kept as required in
your permit.
_Outlet structure forebay and berm inlet to forebay as approved

Other end of forebay with inlets as approved sideslopes and shelf
Trash rack and outlet structure orifice shown trash in pond
YES NO
Compliant ❑ Non -Compliant ® NOV sent ❑ ® Date sent NOV
Inspectors name& signature: Pat C Durrett _ Date: 2/1/08

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711197
SLS
Sife Characteristics:
Total Drainage Area (DA)
sq. ft. acres
81,422 1.87
Impervious Area
Land Use
sq. ft.
acres
building (proposed retail)
8,100
0.19
building awn shop)
5,925
0.14
asphalt
43,485
1,00
concrete
8,140
0.19
Toiaflj
65,650
11.51
Pond Characteristics:
Depth at permanent pool = 7.0 ft,
side slopes = 3 :1
Required surface area at
normal pool = (SA/DA) x (total tract area)
2,809 sq. ft.
Pond Size:
WALMART WEST
Detention Pond Sizing
Elevation
(ft.)
Length
ft.)
Width
(ft.)
Surface Area
(sq. ft.)
Normal Pool
29.0
67
42
2,814.0
Top of Vag. Filter
29.5
73
48
3,504.0
Flood Pool
30.6
79.6
54.6
4,346.2
Top of Bank
31.1
1 82.6
57.6
1 4,757.3
Boftom of Pool
22.0
1 25
0
1 0.0
For first 1" of runoff over impervious area:
Required storage volume above
normal pool = 1(1/12) x (DA) x (% imp.)] +
[(1112) x (DA) x (1-% imp.) x C]
C=0.2
5,738 cu. ft.
Forebay
% impervious = 0.807
= 80.7%
(use) 81%
REQ'D landscaping area = 3,479 sq. ft.
Actual landscaping area = 3,573 sq. ft.
for 81 % Density, SAIDA = 0.0345
(chart for 90% TSS Removal for Wet
Detention without Vegetative Filter
Frovided Storage:
Voi.F;nu _ [(Normal pool SA + Filter SA) 1 2]
x (Filter elev. - N.P. elev.)
— 1,580 cu. ft.
Vol.FWd = [(Fiiter SA + Flood Pcoi SA) 12]
x (F.P. elev. - Filter elev.)
= 4,318 cu. ft.
Total Vol. = 5.897 cu. ft.
Required storage volume = 20% of required storage volume
1,148 cu. ft.
Required Surface area = 20% of normal pool SA
562.8 sq. ft.
Depth
STORMWATER
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9697
9697 Pond � o � 2—

711 /97
SLS
WALMART WEST
Outlet Structure Design
9697
Site Characteristics:
Drainage Area DA
s . ft.
acres
81,422
1.87
% Impervious = 0.806
80.6 %
Pond Size:
Elevation
ft.
Surface Area
/-- ft.
Normal Pool
29
2,814
Flood Pool
30.6
4,346
Outlet Structure:
Q 2day = Provided Vol. / 172,800 sec.
0.034 cfs
Area of pipe = Q / [Cd x SQRT(2 x g x h)]
Cd = 0.6
g = 32.2 ft./s2
h = (F.P. elev. - N.P. elev.) / 2
- 0.80 ft.
A 2 day = 0.0079 sq. ft.
DIA. Of pipe = SQRT[(A x 4) / pi]
0.1004 ft.
2 daY = 1.21 in.
Outlet Structure Check:
Using a 4' x 4' Basin,
Perimeter (L) = 16 ft.
Impervious Area
s . ft.
acres
65,650
1.51
Provided Storage
Volume = 5,897 cu. ft.
Q sday = Provided Vol. / 432,000 sec.
= 0.014 cfs
A sday = 0.0032 sq. ft.
DIA. Of pipe = SQRT[(A x 4) / pi]
0.0635 ft.
0.76 in.
U S C— C� 21�1C_E
Q = CIA
C = (% imp.)(.95) + (1-% imp.)(.25)
- 0.82
I = 6.3 in. for a 10 yr. Storm
A = 1.87 Acres
9.60 cfs
Q= CwxLxH"5
H = [Q / (Cw x L)]213
Cw = 3
0.34 ft.
Peak elevation = flood pool elevation + H
30.94 ft.
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STORM DRAINAGE DESIGN
DATA SHEET
PROJECT_ WAI-MA IZT \619-Sr COMPUTED BY�Lav-,c2 S --v-, N DATE S —ZZ , 7
LOCATION_CARa1-lAya &cdg:d _QCHECKED ©Y SHEET OF—L—.
STORM FREQUENCY YRS.
LOCATION
AREA(ACRE)
C
INTENSITY
Q-CIA
(C.F.S.
REQ'D)
PIPE DATA
REMARKS
FROM
TO
SUB
TOTAL
TOTAL
F�
L
I
TYPE
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LENGTH
SIZE
VEL.
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Q
AVAIL.
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C — RUNOFF COEFFICIENT N - COEFFICiENT OF FRICTION
It - IIEIGIIT ABOVE IIILET OF MOST REMOTE P0114T S - SLOPE (x)
L - LENGDI OF DRA114AGE AREA 0 - FLOW (C.F.S.)
I — EN fi_NSITY OF S IORIA (INC1ics)
NOTE: DESIGN IS BAST%
111E SUM OF III[
AND 1101 111E SU
III[ OISCIIARGES.
*: �, i.. _

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6I5/97 WALMART WEST 9697
SLS Detention Pond Sizing
Site Characteristics:
Total Drainage Area DA
sq. ft.
acres
81,422
1.87
Impervious Area
Land Use
sq. ft.
acres
buildin(proposed retail
8,100
0.19
buildin awn shop)
5,925
0.14
asphalt
43,485
1.00
concrete
8,140
0.19
Total
65,650
i 1.51
Pond Characteristics:
Depth at permanent pool = 6.5 ft.
side slopes = 3 :1
Required surface area at
normal pool = (SAIDA) x (total tract area)
= 3,306 sq. ft.
Pond Size:
Elevation
(ft.)
Length
(ft.
Width
ft.)
Surface Area
(sq. ft.
Normal Pool
29.0
74
45
3,330.0
Flood Pool
30.5
83
54
4,482.0
Top of Bank
31.1
86.6
57.6
4,988.2
Bottom of Pool
22.5
29
0
0.0
For first 1" of runoff over impervious area:
Required storage volume above
normal pool = [(1112) x (DA) x (% imp.)] +
[(1I12) x (DA) x (1-% imp.) x C] ,
C = 0.2
5,738 cu. ft.
Required storage
volume = 20% of required storage volume
1,148 cu. ft.
Surface area = 20% of normal pool SA
= 666 sq. ft.
depth= 3.5ft,
% impervious = 0.807
= 80.7%
use 81 %
REQ'D landscaping area = 3,479 sq. ft.
Actual landscaping area = 3,533 sq. ft.
for 83% Density, SAIDA = 0.0406
(chart for 90% TSS Removal for Wet
Detention without Vegetative Filter
Provided storage volume above
normal pool = [(normal SA + flood SA)12] x
(F.Pool elev. - N.Pool elev.)
= 5,859 cu. ft.
Provided storage volume = (SA / 2) x Depth
1,166 cu. ft.
9697 Pond 1 of 1

615197 WALMART WEST 9697
SLS Outlet Structure Design
Site Characteristics
Drainage Area DA
s . ft. acres
81,422 1.87
% Impervious = 0.806
= 80.6%
Pond Size'
Elevation
ft.
Surface Area
(sq. ft.
Normal Pool
29
3,330
Flood Pool
30.5
4,482
Im envious Area
s . ft. acres
65,660 1.51
Provided Storage
Volume = 5,859 cu. ft.
Outlet Structure:
Q = Provided Vol. / 172,800 sec.(2-day drawdown)
= 0.034 cfs
Area of pipe = Q / [Cd x SQRT(2 x g x h)]
Cd = 0.6
g = 32.2 ft./s2
h = (F.P. elev. - N.P. elev.) / 2
= 0.75 ft.
A = 0.0081 sq. ft.
DIA. Of pipe = SQRT[(A )< 4) / pi)
0.1017 ft.
1.22 in.
Outlet Structure Check:
Using a 4' x 4' Basin,
Perimeter L = 16 ft.
Q = CIA
C = (% imp.)(.95) + (1-% imp.)(25)
= 0.82
1 = 6.3 in. for a 10 yr. Storm
A = 1.87 Acres
— 9.60 cfs
Q= CwxLxH"5
H = [Q / (Cw x L)]2r3
Cw = 3
= 0, 34 ft.
Peak elevation = flood pool elevation + H
= 30.84 ft.
Energy Dissipators
C.I. 2 to Pond:
Q = 2.72 cfs
pipe dia. = 15 in.
Velocity = 1.39 fps
zone 1
L= LA-iO
W= 3yD:� 3.-75'
C.I. 3 to Pond:
Q =
4.71 cfs
pipe dia. =
18 in.
Velocity =
2.00 fps
zone
1
L-7--
LI-4-D 0'
outletstr 1 of i

Date Job
TRIPP RIGMEMG, P.C. W A I M A RT W C- ST
507 Chestnut Street For
Wilmington, North Carolina 26401
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II SC-7
Design Sheet
SL S of
Check Job No..
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