SW8050420_COMPLIANCE_20050425

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW '21)�1'to�.C�
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

TRIPP ENGINEERING, P.C.
419 Chestnut Street, Wilmington, NC 28401
Phone: [phone] • FAX: [phone]
Email: [e-mail]
} LETTER OF TRANSMITTAL
To: CIEN F-
Attention : 1 _ x LE( )IS
Su bject:
FAX TRANSMf17AL: NUMBER OF PAGES INCLUDES COVER
I am sending you: X) ATTACHED ( ) UNDER SEPARATE COVER
( ) Prints ( ) Tracings ( ) Copy of letter ( ) Specifications ( ) Other
Copies Item No. _ Descrli ion
I F--tvad ewev-C
These are transmitted as checked below:
( ) For Approval (N For Your Use { } Sign & Return { ) Review
Remarks:
AUG 2 2 2006
cc:

TE 06070
State Stormwater Management Systems
Permit No. SW8 050420
Ferguson Enterprises
Stormwater Project No. SW8 050420
Brunswick County
Engineer's Certification
i, Phillip G. Tripp , as a duly registered Professional Engineer in the
State of North Carolina, having been authorized to observe (periodically/weekly/full
time) the construction of the project,
Ferguson Enterprises
(Project)
for Ferguson Enterprises, Inc. (Project Owner) hereby state that, to the best
of my abilities, due care and diligence was used in the observation of the project
construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specifications:
SEAL
Signature
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Registration Number 17374
SEA!
Date 17374
ell
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State Stormwater Management Systems
Permit No, SW8 050420
Certification Requirements: Page 2 of 2
1. The drainage area to the system contains approximately the permitted
acreage.
2. The drainage area to the system contains no more than the permitted
amount of built -upon area.
�3. All the built -upon area associated with the project is graded such that the
runoff drains to the system.
�4. All roof drains are located such that the runoff is directed into the system.
5. The outlet/bypass structure elevations are per the approved plan.
J 6. The outlet structure is located per the approved plans.
7. Trash rack is provided on the outlet/bypass structure.
N4ora�' 8. all slopes are grassed with permanent vegetation.
J9. Vegetated slopes are no steeper than 3:1.
�10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
J11. The permitted amounts of surface area and/or volume have been
provided.
�12. Required drawdown devices are correctly sized per the approved plans.
13. All required design depths are provided.
�14. All required parts of the system are provided, such as a vegetated shelf, a
forebay, and the vegetated filter.
�15. The required dimensions of the system are provided, per the approved
plan.
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WET DETENTION POND ANALYSIS
FILE NAME:
PROJECT #: SVV8 050420.apr05
PROJECT -NAME: Ferguson Enterprises
S:IWQSIPOND1050420.apr05.WK1
REVIEWER: L. Lewis
DATE: 25-Apr-05
Receiving Stream: Sha€iotte River Class: Sc
Drainage Basin: Lumber Index No. LBR 15-25-2-(5)
Site Area 2.85 acres
Drainage Area 1''632400 square feet Area in Acres 2.90
IMPERVIOUS AREAS
Buildings
Parking
SW
Other
TOTAL
SURFACE AREA CALCULATION
% IMPERVIOUS 73.62%
Des. Depth 5
TSS: 90
Rational C
19300.00 square feet
60000.00 square feet
2800.00 square feet
10900.00 square feet
square feet
square feet
square feet
3C.00 square feet
Rational Cc= 0.05
SA/DA Ratio 525%
Req. SA 6636 sf
Prov. SA sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
FOREBAY
Perm. Pool Volume= 20900
Req. Forebay Volume= 4180
Provided Volume= 4325..00
Percent=
Elevation
96.00
97.00
ORIFICE CALCULATION
Area
8100.00
10750.00
Inc. Vol.
9425.00
Acc. Vol.
0.00
9425.00
Avg. Head =
0.47 ft
Q2 Area =
1.90
sq. inches
Flow Q2, cfs
0.043 cfs
Q5 Area =
0.76
sq. inches
Flow Q5, cfs
0.017 cfs
Orifice Area
1.77
sq. inches
No. of Orifices
r
Q=
0.040
cfs
Diameter, inches
1t
weir H x W
in
x
in
Drawdown =
2 1
days
Surface Area @DP =
10750 sq. ft.
Falling Head Drawdown
=
3.7 days
C: 3.3075
L= -0.094
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines