SW8021201_COMPLIANCE_20100713

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW_F6:gII D
DOC TYPE
El CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

NC®ENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
July 13, 2010
Mr. William Dansey
Quality Built Construction, Inc
8-H Merry Lane
Greenville, NC 27858
Subject: NOTICE OF VIOLATION, NOV-2010-PC-0850
The Marshes at Rivers Edge
Stormwater Permit No. SW8 021201
New Hanover County
Dear Mr. Dansey:
Dee Freeman
Secretary
On June 8, 2010, Wilmington Regional Office personnel performed a Compliance Inspection
and file review of the subject project, located at Independence Blvd in Wilmington, New Hanover
County, North Carolina. The inspection was performed to determine the status of compliance
with Stormwater Permit Number SW8 021201, issued to you on May 5, 2003.
The project has been found in violation of Stormwater Permit Number SW8 021201, issued
pursuant to the requirements of 15A NCAC 2H.1000. The violations found are:
Failure to certify the stormwatersystem. A file review revealed that this office
has not received a Designers Certificate.
Permit condition states that upon completion of construction, prior to issuance of a Certificate of
Occupancy, and prior to operation of this permitted facility, a certification must be received from
an appropriate designer for the system installed certifying that the permitted facility has been
installed in accordance with this permit, the approved plans and specifications, and other
supporting documentation. Any deviations from the approved plans and specifications must be
noted on the Certification.
To correct these violations you must:
Provide a written "Plan of Action" which outlines the actions you will take to
correct the violation(s) and a time frame for completion of those actions, on or
before August 13, 2010.
2. Submit the required Designers Certificate.
Failure to provide the "Plan of Action" by August 13, 2010, or to correct the violations by the
date designated in the "Plan of Action", are considered violations of 15A NCAC 2H.1000, and
may result in the initiation of enforcement action which may include recommendations for the
assessment of civil penalties, pursuant to NCGS 143-215.6A.
Wilmington Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405
Phone: [phone] l FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.ncwalergaality.org
An Equal Opportunity 1Affirmative Action Employer
Nort:hCarolina
;VattirrrllJ

{
July 13, 2010
The Marshes at Rivers Edge
Stormwater Permit No. SW8 021201
By copy of this letter to the New Hanover County Building Inspector, this Office is requesting
that the Building Inspector consider withholding building permits and Certificates of Occupancy
for this project until this matter is satisfactorily resolved.
If you have any questions concerning this matter, please call David Cox at [phone].
Sincgrely,
Georgette Scott
Stormwater Supervisor
Division of Water Quality.
GDSldwc: S:IWQSISTORMWATERINOTICEI.jul10
CC.' Jimmy Fentress
New Hanover County Building Inspections
John Hennessey
David Cox
Georgette Scott
'Central Files
WiRO
Page 2 of 4

4 `
July 13, 2010
The Marshes at Rivers Edge
Stormwater Permit No. SW8 021201
The Marshes at Rivers Edge
Hew Hanover County
Stormwater Project No. SW8 021201
Designer's Certification
Page 1 of 2
I, , as a duly registered in the
State of North Carolina, having been authorized to observe (periodically 1 weekly 1 full time) the
construction of the project,
ject
for (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.
Required Items to be checked for this certification to be considered complete are on page 2 of
this form.
Noted deviations from approved plans and specifications:
Signature
Registration Number
Date
SEAL
Page 3 of 4

July 13, 2010
The Marshes at Rivers Edge
Stormwater Permit No. SW8 021201
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. The outlet/bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
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.
10. The permitted amounts of surface area and/or volume have been provided.
11. Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a
forebay.
14. The dimensions of the system, as shown on the approved plans, are provided.
cc: NCDENR-DWQ
New Hanover County Building Inspections
Page 4 of 4

Compliance Inspection Report
Permit: SW8021201 Effective: 05/05/03 Expiration: 05/05/13 Owner: Quality Built Construction Inc
Project: Echo Farms- The Marshes at River's Edge
County: New Hanover Indepdence Blvd At River Rd
Region: Wilmington
Wilmington NC 28405
Contact Person: William Dansey Title: President Phone: [phone]
Directions to Project:
US 421 N from US 421/NC132 intersection to Independence Blvd. Left on Independence to River Road, property on NE corner.
Type of Project: State Stormwater - HD - Detention Pond
Drain Areas: 1 - (Barnards Creek) (03-06-17 } { C;Sw)
2 - (Barnards Creek) (03-06-17) ( C;Sw)
3 - (Barnards Creek) (03-06-17) ( C;Sw)
4 - (Barnards Creek) (03-06-17) ( C;Sw)
5 - (Barnards Creek) (03-06-17) { C;Sw)
On -Site Representative(s):
Related Permits:
Inspection Date: 06/08/2010 Entry Time: 01:30 PM
Primary Inspector: David W Cox
Secondary Inspector(s):
Reason for Inspection: Routine
Permit Inspection Type: State Stormwater
Facility Status: ❑ Compliant ■ Not Compliant
Question Areas:
® State Stormwater
(See attachment summary)
Exit Time: 02:00 PM
Phone: [phone]
Inspection Type: Compliance Evaluation
Page: 1

Permit: SW8021201 Owner - Project: Quality Built Construction Inc
Inspection Date: 06/08/2010 Inspection Type: Compliance Evaluation Reason for Visit: Routine
Inspection Summary:
In order to bring this system into compliance
File Review
Yes
No
NA
NE
Is the permit active?
■
❑
❑
❑
Signed copy of the Engineer's certification is in the file?
❑
■
❑
❑
Signed copy of the Operation & Maintenance Agreement is in the file?
Ri
❑
❑
❑
Copy of the recorded deed restrictions is in the file?
❑
❑
■
❑
Comment: 1. No Engineer's Certification in File
SW Measures
Yes
No
NA
NE
Are the SW measures constructed as per the approved plans?
■
❑
❑
❑
Are the inlets located per the approved plans?
®❑
❑
Cl
Are the outlet structures located per the approved plans?
®
Cl
❑
0
Comment:
Operation and Maintenance
Yes
No
NA
NE
Are the SW measures being maintained and operated as per the permit requirements?
■
❑
❑
❑
Are the SW BMP inspection and maintenance records complete and available for review or provided to DWQ ❑ ❑ L 0
upon request?
Comment:
Page: 2

Compliance Inspection Report
Permit: SW8021201 Effective:05105/03 Expiration 05105I17
Project: Echo Farms- The Marshes at Rivers Edge
Owner: Quality Built Construction Inc
County: New Hanover Adress: Indepdence Blvd At River Rd
Region: Wilmington
CitylStatelZip: Wilmington NC 28405
Contact Person: William Dansey Title: President Phone: [phone]
Directions to Project:
US 421 N from US 4211NC132 intersection to Independence Blvd. Left on Independence to River Road, property on NE corner.
Type of Project: State Stormwater -fit) - Detention Pond
Drain Areas: 1 - (Barnards Creek) (03-06-17) ( C;Sw)
2 - (Barnards Creek) (03-06-17) ( C;Sw)
3 - (Barnards Creek) (03-06-17) ( C;Sw)
4 - (Barnards Creek) (03-06-17) { C;Sw)
5 - (Barnards Creek) (03-06-17) ( C;Sw)
On -Site Representative(s):
Related Permits:
Inspection Date: 03/20/2015 Entry Time: 01:OOPM
Primary Inspector: Alida R Lewis
Secondary lnspector(s):
Reason for Inspection: Other
Permit Inspection Type; State Stormwater
Facility Status: ❑ Compliant 0 Not Compliant
Question Areas:
0 State Stormwater
(See attachment summary)
Exit Time: 01:30PM
Phone: [phone]
Inspection Type: Transfer Renewal
page: 1

Permit: SWO021201 Owner - Project: Quality Built Construction Inc
>M
Inspection Date: 0312=015 Inspection Type Transfer Renewal Reason for Visit: Other
Inspection Summary:
The inspection revealed the following deficiencies that must be addressed:
1. Pond #3 needs to be maintained to restore that pond to design condition.
2, The outlet stucture in Pond #1 needs to be maintainedfrepaired in order to restore orifice flow.
3. The added PVC pipe through the curbing at Building #5 needs to be plugged, or piped over to Pond #1 for treatment or
piped into a catch basin that ultimately drains to Pond #1.
4. A partial designer's certification to cover the parts of the project and the BMP's that are built must be submitted.
5. Verification must be provided that the roof drainage from the backs of the buildings is being collected and directed into
the appropriate permitted BMP.
6. Due to the dissolution of the original permittee LLC in 2008, and the passing of the permittee in 2013, ownership of the
permit needs to be settled. The permit should probably be transferred to the next developer of the project because it may
not meet the requirements to be transferred to the COA under SL 2011-256 at this time.
page: 2

e—)
Permit: SW8021201 Owner - Project: Quality Built Construction Inc
Inspectlon Date: 03/20/2015 Inspection Type Transfer Renewal Reason for Visit: Other
File Review Yes No NA NE
Is the permit active? 0 ❑ ❑ ❑
Signed copy of the Engineer's certification is in the file? ❑ 0 ❑ ❑
Signed copy of the Operation & Maintenance Agreement is in the file? ❑ ❑ ❑
Copy of the recorded deed restrictions is in the file? ❑ ❑ E ❑
Comment: 1. The Designers Certification has not been received. The consultant provided a letter on August 12
2010 indicating that due to a lack of routine maintenance and due to the fact that not all of the buildings
were completed, he was not able to certify the project. The consultant also indicated that he_expected
to be able to certify the_oroiect by September 13, 2010.
Built Upon Area
Is the site BUA constructed as per the permit and approval plans?
Is the drainage area as per the permit and approved plans?
Yes No NA NE
■ ❑❑❑
■❑❑❑
Is the BUA (as permitted) graded such that the runoff drains to the system? ❑ E 110
Comment: 2. In the PaNng lot in front of Building #5 someone has added a small PVC pipe through the curbing
which allows runoff from some of that paved area to enter the wetland anCbypass treatment in the pond.
3. The consultant will need to verify that the roof drainage from the rear of those buildings that are
already built is being collected and sent to the appropriate pond for treatment.
SW Measures
Are the SW measures constructed as per the approved plans?
Are the inlets located per the approved plans?
Yes No NA NE
❑ ■❑❑
❑ ❑ ❑
Are the outlet structures located per the approved plans? 0 ❑ ❑ ❑
Comment: 4_Pond #_3 is not built per the approved plans. The slopes are very steep, bare and eroding. There is a
lot of trash and construction debris littering the site.
5. Theequalizer pipe between Pond 2 and 2A was not visible. The consultant will need to verify its
presence.
Operation and Maintenance Yes No NA NE
Are the SW measures being maintained and operated as per the permit requirements? ❑ , ❑
Are the SW BMP inspection and maintenance records complete and available for review or provided to ❑ ❑ ❑
DWQ upon request?
Comment: 6. Ponds 1 and 2 are being maintained, but Pond 3 is not.
7. The outlet_ structure in Pond 1 may be blocked because there was no runoff leaving the pond, but the
water level appeared to be up over the temporaryool outlet
Other Permit Conditions
Is the site compliant with other conditions of the permit?
Yes No NA NE
❑ ■❑❑
page: 3

Permit: SW8021201 Owner - Project: Quality Built Construction Inc
inspection Date: 03120/2015 Inspection Type Transfer Renewal Reason for visit: Other
Comment: 8. The permittee of record_ dissolved their coporate_entity on February _1.2,-2008 and the permit holder
Passed away in 2013. The permit will need to be transferred to the next developer, as it's likely the
project will not meet the SL 2011-256 requirments for transfer to the Condominimum Owners
Association at this time.
page: 4

Compliance Inspection Report
Permit: SW8021201 Effective: 05/05/03 Expiration: 05/05/17 Owner: Quality Built Construction Inc
Project: Echo Farms- The Marshes at River's Edge
County: New Hanover Indepdence Blvd At River Rd
Region: Wilmington
Wilmington NC 28405
Contact Person: William Dansey Title: President Phone: [phone]
Directions to Project:
US 421 N from US 421/NC132 intersection to Independence Blvd. Left on Independence to River Road, property on NE corner.
Type of Project: State Stormwater - HD - Detention Pond
Drain Areas: 1 - (Barnards Creek) (03-06-17) ( C;Sw)
2 - (Barnards Creels) (03-06-17 ) ( C;Sw)
3 - (Barnards Creek) (03-06-17 ) ( C;Sw)
4 - (Barnards Creek) (03-06-17 ) ( C;Sw)
5 - (Barnards Creek) (03-06-17 ) ( C;Sw)
On -Site Representative(s):
Related Permits:
Inspection Date: 11/08/2012 Entry Time: 03:35 PM
Primary Inspector: David W Cox
Secondary Inspector(s):
Reason for Inspection: Follow-up
Permit Inspection Type: State Stormwater
Facility Status: ❑ Compliant ■ Not Compliant
Question Areas:
E State Stormwater
(See attachment summary)
Exit Time: 04:00 PM
Phone: [phone]
Inspection Type: Compliance Evaluation
Page: 1

f ti
Permit: SW8021201 Owner - Project: Quality Built Construction Inc
Inspection Date: 11/08/2012 Inspection Type: Compliance Evaluation Reason for Visit: Follow-up
Inspection Summary:
In order for this project to be in compliance with the terms and conditions please provide the required Engineer's
Certificate within 30 days of receipt of this report.
File Review
Yes No
NA
NE
Is the permit active?
■
❑
❑
❑
Signed copy of the Engineer's certification is in the file?
❑
■
❑
❑
Signed copy of the Operation & Maintenance Agreement is in the file?
■
❑
❑
❑
Copy of the recorded deed restrictions is in the file?
❑
❑
■
❑
Comment: This office has not received a copy of the engineer's certification
Operation and Maintenance
Yes
No
NA
NE
Are the SW measures being maintained and operated as per the permit requirements?
❑
❑
❑
❑
Are the SW BMP inspection and maintenance records complete and available for review or provided to DWO ❑
❑
❑
❑
upon request?
Comment:
Page: 2

Cox, David
From:
Cox, David
Sent:
Thursday, November 15, 2012 1:41 PM
To:
'Jimmy Fentress'
Cc:
Scott, Georgette
Subject:
RE: SW8021021
Attachments:
2012 10 cei_bims 021201.pdf
Jimmy,
Here is the official inspection report. Look its attached aren't you proud?
From: Jimmy Fentress [mailto:jfentressCabstroudenglneer.com]
Sent: Tuesday, November 13, 2012 9:22 AM
To: Cox, David
Cc: Scott, Georgette
Subject: RE: SW8021021
No attachment????
From: Cox, David[mailto:[e-mail]]
Sent: Tuesday, November 13, 2012 9:18 AM
To: Jimmy Fentress
Cc: Scott, Georgette
Subject: RE: SW8021021
Here is the 2010 NOV.
From: Jimmy Fentress [mailto:'fentress strouden ineer.com]
Sent: Friday, November 09, 2012 11:14 AM
To: Cox, David
Subject: RE: SW8021021
Please and thanks.
jimmy
From: Cox, David [mailto:[e-mail]]
Sent: Friday, November 09, 2012 8:20 AM
To: Jimmy Fentress
Cc: Scott, Georgette
Subject: RE: SW8021021
I'll send it Tuesday. I have a lot of inspection/meetings today.
From: Jimmy Fentress [ma !Ito: jfentressCalstroudengineer.com]
Sent: Thursday, November 08, 2012 11:19 AM
To: Cox, David
Cc: Scott, Georgette
Subject: RE: SW8021021

Please send me the NOV. i can't find where we have certified it but we do have adequate survey data to consider it for
certification. I think that the ponds in areas that were not finished probably have not been maintained. The ponds in
areas that are complete are in great shape. Let me revisit the site on the way home today and I will report back as to my
ability to certify or partially certify.
jimmy
From: Cox, David [mailto:david.w.cox(a)ncdenr.gov]
Sent: Thursday, November 08, 2012 10:26 AM
To: Jimmy Fentress
Cc: Scott, Georgette
Subject: SW8021021
Jimmy,
Did the Marshes at Rivers Edge ever get certified? It is coming up for renewal soon and I have an Notice of Violation on
it. It is a clearing house day.
David
From: Jimmy Fentress [ma ilto:jfentress@stroudenginee r.com]
Sent: Thursday, November 08, 2012 9:40 AM
To: Cox, David; Scott, Georgette
Cc: 'Murray, Anne W (GE Power & Water)'
Subject: RE: Airlie Forest
Got it and thanks
From: Cox, David [pailto:[e-mail]]
Sent: Thursday, November 08, 2012 9:38 AM
To: Scott, Georgette; Jimmy Fentress
Cc: 'Murray, Anne W (GE Power & Water)'
Subject: RE: Airlie Forest
Jimmy,
Don't forget the transfer documents before the modification.
David
From: Scott, Georgette
Sent: Thursday, November 08, 2012 8:09 AM
To: Jimmy Fentress
Cc: Cox, David; 'Murray, Anne W (GE Power & Water)'
Subject: RE: Airlie Forest
Thank you for your plan. It sounds reasonable. Let us know when you will move forward.
Ccorgelte Scott.
Storiir►vater Progmun Supervisor
Stale Stor[nwater Progn':uii
NC Division of Water Quality
127 Cardinal Drive Ext.
Wilminglon, NC 2840.5
Phone [phone]

Fax (910) ; 3 50-2004
1'�ntai] a�rrespundcnec lu and front Ibis address nra}' be Sobjcct to the North Caroh m 1'ub k Rceurds W mid nmy he VMS m [bird parties.
From: Jimmy Fentress[mailto:]fentress(&stroudengineer.com]
Sent: Wednesday, November 07, 2012 3:58 PM
To: Scott, Georgette
Cc: Cox, David; 'Murray, Anne W (GE Power & Water)'
Subject: Airlie Forest
All,
The attached Plan of Action went out in the mail today. I am now engaged by the Airlie Forest Homeowner's Association
to make application in this regard.
Thanks,
Jimmy Fentress

WET DETENTION POND ANALYSIS
FILE NAME: G:IDATAIWPDATAIWQSIPOND1021201-2.WK1
PROJECT #: SW8 021201-2 REVIEWER: L. Lewis
PROJECT NAME: Barnards Landing @Echo Farms DATE: 14-Apr-03
Receiving Stream: Barnards Creek Class: C Sw
Drainage Basin: Cape Fear Index No. CPF17 18-8C
Site Area 53.40 acres
Drainage Area >-374.180 00 ;square feet Area in Acres 8.59
IMPERVIOUS AREAS
Rational C
Buildings
93489.00
square feet
Parking
74779.00
square feet
Sidewalks
14566.00
square feet
Street
29007.00
square feet
square feet
square feet
TOTAL 21f1 00 square feet Rational Cc= 0.09
SURFACE AREA CALCULATION
% IMPERVIOUS 56.61%
Des. Depth 5.5
TSS: 90
SA/DA Ratio 3,63%
Req. SA 13580 sf
Prov. SA
VOLUME CALCULATION * place a "1" in the box if Rational is used
Req. Volume .. °I44
Vol. Prov. at DP :........179.31 cf
ORIFICE CALCULATION
Perm. Pool Volume= 38212
Req. Forebay Volume= 7642.4
Provided Volume= 8234.00
Percent= 21 5°fo
Elevation
7.00
8.00
Area
15604.00
17728.00
Inc. Vol.
14597.50
16666.00
Acc. Vol.
14597.50
31263,50
Avg. Head =
0.56 ft
Q2 Area =
4.04
sq. inches
Flow Q2, cfs
0.101 cfs
05 Area =
1.62
sq. inches
Flow Q5, cfs
0.040 cfs
Orifice Area
3.14
sq. inches
No. of Orifices
:.;:::<;
Q-
0.078
cfs
Diameter, inches
weir H x W
in
x
in
Drawdown =
im
days
Surface Area @DP
=
16293.5 sq. ft.
Falling Head Drawdown =
3.6 days
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.

WET DETENTION POND ANALYSIS
FILE NAME: G:IDATAIWPDATAIWQSIPOND1021201-3.WK1
PROJECT #: SW8 021201-3 REVIEWER: L. Lewis
PROJECT NAME: Barnards Landing @Echo Farms DATE: 14-Apr-03
Receiving Stream: Barnards Creek Class: C SW
Drainage Basin: Cape Fear Index No, CPF17 18-8C
Site Area 53.40 acres
Drainage Area f,4244! 00 square feet Area in Acres 3.27
IMPERVIOUS AREAS
Buildings
Parking
Sidewalks
TOTAL
36943.00
square feet
46353.00
square feet
5554.00
square feet
4�
square feet
square feet
square feet
888�6 0>
square feet
SURFACE AREA CALCULATION
% IMPERVIOUS 62.40%
Des. Depth 6
TSS: 85
Rational C
Rational Cc= 0.08
SA/DA Ratio 2.67%
Req. SA 3806 sf
Prov. SA ..........4t}33'€ sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Req. Volume ..... ;Z6t} cf
Vol. Prov. at DP 7416 cf
ORIFICE CALCULATION
Avg. Head =
Flow Q2, cfs
Flow Q5, cfs
No. of Orifices
Diameter, inches
Drawdown =
Perm. Pool Volume=
9836
Req. Forebay Volume=
1967.2
Provided Volume=
2222.00
Percent=
Elevation Area
Inc. Vol. Acc. Vol.
7.00 5073.00
4553.00
8.00 6377.00
5725.00 10278.00
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.

WET DETENTION POND ANALYSIS
FILE NAME: G:IDATAIWPDATAIWQSIPOND1021201-5.WK1
PROJECT #: SW8 021201-5 REVIEWER: L. Lewis
PROJECT NAME: Barnards Landing @Echo Farms DATE: 14-Apr-03
Receiving Stream: Barnards Creek Class: C Sw
Drainage Basin: Cape Fear Index No. CPF17 18-8C
Site Area 53.40 acres
Drainage Area 45738 00 square feet Area in Acres 1.05
IMPERVIOUS AREAS
Buildings
Parking
Sidewalks
TOTAL
SURFACE AREA CALCULATION
% IMPERVIOUS 68.81%
Des. Depth 4
TSS: 90
Rational C
13402,00 square feet
16770.00 square feet
1300.00 square feet
square feet
square feet
square feet
3172 a0.> square feet
Rational Cc= 0.06
SA/DA Ratio 5,92%
Req. SA 2706 sf
Prov. SA ........3..5 sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
Des. Storm
::;:'.1..O.Q:
inches
Rv=
0.669
Bottom
2 msl
Perm. Pool
6 OCh:: msl
Design Pool
6.8 msl
Storage met @elev 6.70 msl
Req. Volume
2a1-,'
cf
Vol. Prov.'at DP
:::::;:294.':
cf
ORIFICE CALCULATION
FOREBAY
Perm. Pool Volume= 4149
Req. Forebay Volume= 829.8
Provided Volume= 909.00
Percent= 21#o
Elevation Area Inc. Vol. Acc. Vol.
6.00 3105.00 0.00
7.00 4181,00 3643.00 3643.00
Avg. Head =
0.38
ft
Q2 Area =
0.71
sq. inches
Flow Q2, cfs
0.015
cfs
Q5 Area =
0.28
sq, inches
Flow Q5, cfs
0.006
cfs
Orifice Area
0.44
sq. inches
No. of orifices
<;iA
Q=
0.009
cfs
Diameter, inches
D 75.;
weir H x W
:.....> m
x
;.;
i n
Drawdown =
3
days
Surface Area @DP
=
4181 sq. ft.
Falling Head Drawdown =
5.1 days
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.

WET DETENTION POND ANALYSIS
FILE NAME: G:IDATAIWPDATAIWQSIPOND1021201-4.WK1
PROJECT #: SW8 021201-4 REVIEWER: L. Lewis
PROJECT NAME: Barnards Landing @Echo Farms DATE: 05-May-03
Receiving Stream: Barnards Creek Class: C Sw
Drainage Basin: Cape Fear Index No. CPF17 18-BC
Site Area 53.40 acres
Drainage Area 84ii7 CR0 :< square feet Area in Acres 1.93
IMPERVIOUS AREAS
Buildings
Parking
Sidewalks
TOTAL
SURFACE AREA CALCULATION
20359,00 square feet
25906.00 square feet
2235.00 square feet
square feet
square feet
square feet
4$f30 04` square feet
Rational C
Rational Cc= 0.08
% IMPERVIOUS
57.69%
SAIDA Ratio
4.59%
Design Depth
4.5
Req. SA
3861 sf
TSS:
90
Prov. SA
:,,;::> 233. sf
VOLUME CALCULATION
Rational ?*
Des. Storm
_. ._
inches
Rv=
0.569
Bottom
2.5 msl
Perm. Pool
? 00:'; msl
Design Pool
8 msl
Storage met @elev 7.81 msl
Req. Volume I..........;;9$8:' cf
Vol. Prov. at DP 4912 ` cf
ORIFICE CALCULATION
place a "1" in the box if Rational is used
FOREBAY
Perm. Pool Volume= 7053
Req. Forebay Volume= 1410.6
Provided Volume= 1391.00
Percent= .1 7o/u
Elevation Area Inc. Vol.
7.00 4233.00
8.00 5591.00 4912.00
Acc. Vol.
0.00
4912.00
Avg. Head =
0.48
ft
Q2 Area =
1.00
sq. inches
Flow Q2, cfs
0.023
cfs
Q5 Area =
0.40
sq. inches
Flow Q5, cfs
0.009
cfs
Orifice Area
0.79
sq. inches
No. of Orifices
::::
Q=
0.018
cfs
Diameter, inches
1 04:,
weir H x W
.
Drawdown =
:: 2 5
days
Surface Area @DP =
5591 sq. ft.
Falling Head Drawdown =
4.3 days
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.

WET DETENTION POND ANALYSIS
FILE NAME: G:IDATAIWPDATAIWQSIPOND1021201-4.WK1
PROJECT #: SW8 021201-4 REVIEWER: L. Lewis
PROJECT NAME: Barnards Landing @Echo Farms DATE: 05-M2y-03
Receiving Stream: Barnards Creek Class: C Sw
Drainage Basin: Cape Fear Index No. CPF17 18-8C
Site Area 53.40 acres
Drainage Area 8407 Oa `square feet Area in Acres 1.93
IMPERVIOUS AREAS
Buildings
Parking
Sidewalks
TOTAL
SURFACE AREA CALCULATION
20359,00 square feet
25906.00 square feet
2235.00 square feet
square feet
square feet
square feet
48SQ 00 .' square feet
Rational C
Rational Cc= • 0.08
% IMPERVIOUS
57.69%
SA/DA Ratio
4.59%
Design Depth
4.5
Req. SA
3861 sf
TSS:
90
Prov. SA
423'' sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
Des. Storm
€?`:
inches
Rv=
0.569
Bottom
2.5 msl
Perm. Pool
?OQ.. msl
_..........
Design Pool
8 msl
Storage met @elev 7.81 msl
Req. Volume
:.:.:3988::< cf
Vol. Prov. at DP
_ - .; 4912'' cf
ORIFICE CALCULATION
Perm. Pool Volume=
7053
Req. Forebay Volume=
1410.6
Provided Volume=
1391.00
Percent=
Elevation Area
Inc. Vol. Acc. Vol.
7.00 4233.00
0.00
8.00 5591.00
4912.00 4912.00
Avg. Head =
0.48 ft
Q2 Area = 1.00
sq. inches
Flow Q2, cfs
0.023 cfs
Q5 Area = 0.40
sq. inches
Flow Q5, cfs
0.009 cfs
Orifice Area 0.79
sq. inches
No. of Orifices
<;
Q= 0.018
cfs
Diameter, inches
1i0 >, weir H x W
i
:: in x
in
Drawdown W
5 € days
Surface Area @DP =
5591 sq. ft.
Failing Head Drawdown =
4.3 days
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.

WET DETENTION POND ANALYSIS
FILE NAME: G:\DATA\WPDATA\WQS\POND1021201-5.WK1
PROJECT#: SW8 021201-5 REVIEWER: L. Lewis
PROJECT NAME: Barnards Landing @Echo Farms DATE: 14-Apr-03
Receiving Stream- Barnards Creek Class: C Sw
Drainage Basin: Cape Fear Index No. CPF17 18-8C
Site Area 53.40 acres
Drainage Area 5738Isquare feet Area in Acres 1.05
IMPERVIOUS AREAS Rational C
Buildings 13402.00 square feet
Parking 16770,00 square feet
Sidewalks 1300.00 square feet
square feet
square feet
square feet
TOTAL square feet Rational Cc= 0,06
SURFACE AREA CALCULATION
% IMPERVIOUS 68.81%
Des. Depth 4
TSS: 90
SA/DA Ratio 5.92%
Req. SA 2706 sf
Prov, SA
VOLUME CALCULATION * place a "ll" in the box if Rational is used
Rational ?*
Des. Storm
inches
Rv=
0.669
Bottom
2 msl
Perm. Pool
FTFU7W msl
Design Pool
6.8 msl
Storage met @elev 6.70 msl
Req. Volume
cf
Vol. Prov. *at DP
cf
ORIFICE CALCULATION
Avg. Head =
Flow Q2, cfs
Flow Q5, cfs
No. of Orifices
Diameter, inches
Drawdown =
FOREBAY
Perm. Pool Volume= 4149
Req. Forebay Volume= 829.8
Provided Volume= 909.00
Percent=
Elevation
Area Inc. Vol.
6.00
3105.00
7.00
4181.00 3643.00
0,38
ft
Q2 Area =
0.71
0.015
cfs
Q5 Area =
0.28
0.006
cfs
Orifice Area
0.44
Q=
0,009
4.7weir
H x W
in
x
days
Surface Area @DP
Falling Head Drawdown
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.
Acc. Vol.
0.00
3643.00

WET DETENTION POND ANALYSIS
FILE NAME: G:IDATAIWPDATAIWQSIPOND1021201-2.WK1
PROJECT #: SW8 021201-2 REVIEWER: L. Lewis
PROJECT NAME: Barnards Landing @Echo Farms DATE: 14-Apr-03
Receiving Stream: Barnards Creek Class: C Sw
Drainage Basin: Cape Fear Index No. CPF17 18-8C
Site Area 53.40 acres
Drainage Area 7418q f�0 ' square feet Area in Acres 8.59
IMPERVIOUS AREAS
Rational C
Buildings
93489.00
square feet
Parking
74779.00
square feet
Sidewalks
14566.00
square feet
Street
29007.00
square feet
square feet
square feet
TOTAL 21 i.M 'WO."I square feet Rational Cc= 0.09
SURFACE AREA CALCULATION
% IMPERVIOUS
56.61%
SAIDA Ratio
3.63%
Des. Depth
5.5
Req. SA
13580 sf
TSS:
90
Prov. SA�13591
fl sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
Des. Storm
1;';.QfJ
inches
Rv=
0.560
Bottom
0.5 msl
Perm. Pool
6 00' , msl
Design Pool
7.2 msl
Storage met @elev 7.17 msl
Req. Volume 17 47 ` cf
Vol. Prov. at DP 17:33.1 cf
ORIFICE CALCULATION
FOREBAY
Perm. Pool Volume= 38212
Req, Forebay Volume= 7642.4
Provided Volume= 8234.00
Percent=
Elevation
7.00
8.00
Area
15604.00
17728.00
Inc. Vol.
14597.50
16666.00
Acc. Vol.
14597.50
31263.50
Avg. Head =
0.56 ft
Q2 Area =
4.04
sq. inches
Flow Q2, cfs
0.101 cfs
Q5 Area =
1.62
sq. inches
Flow 05, cfs
0.040 cfs
Orifice Area
3.14
sq. inches
No. of Orifices
1:
Q=
0.078
cfs
Diameter, inches
„2 C3;;
weir H x W
in
x
to
Drawdown =
;2 6:,
days
Surface Area @DP =
16293.5 sq. ft.
Falling Head Drawdown =
3.6 days
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.

WET DETENTION POND ANALYSIS
FILE NAME- G:kDATA\WPDATA\WQS\POND1021201-3.WK1
PROJECT#: SW8 021201-3 REVIEWER, L. Lewis
PROJECT NAME- Barnards Landing @Echo Farms DATE.- 14-Apr-03
Receiving Stream- Barnards Creek class, C Sw
Drainage Basin: Cape Fear Index' No. CPF17 18-8C
Site Area 53.40 acres
Drainage Area Qqsquare feet Area in Acres 3,27
IMPERVIOUS AREAS
Buildings
Parking
Sidewalks
TOTAL
36943.00
square feet
46353.00
square feet
55&4.00
square feet
square feet
square feet
square feet
$$�6 OQ,:
square feet
SURFACE AREA CALCULATION -
% IMPERVIOUS 62.40%
Des. Depth 6
TSS: 85
Rational C
Rational Cc= 0.08
SA/DA Ratio 2,67%
Req. SA 3806 sf
Prov. SA
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
FOREBAY
Des. Storm
inches
Perm. Pool Volume=
9836
Rv=
0.612
Req. Forebay Volume=
1967.2
Bottom
0 ms1
Provided Volume=
2222.00
Perm. Pool
MSI
Percent=
Design Pool
7.5 msl
Storage met @elev 7.47 msi
Elevation Area
Inc. Vol. Acc. Vol.
Req. Volume
cf
7.00 5073.00
4553.00
Vol. Prov. at DP
cf
8.00 6377.00
5725.00 10278.00
ORIFICE CALCULATION
Avg. Head =
0,73 ft
Q2 Area = 1,47
sq. inches
Flow Q2, cfs
0.042 cfs
Q5 Area = 0.59
sq. inches
Flow Q5, cfs
0.017 cfs
Orifice Area 0.79
sq. inches
No. of Orifices
7,1
Q= 0.022
cfs
Diameter, inches
6�il weir H x W
in x
17777M in
Drawdown
Tj days
Surface Area @DP
5854,33333 sq ft.
Falling Head Drawdown =
5.3 days
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.

NCDENR
STATE STORMWATER MANAGEMENT
PLAN
BA ARLDG
@ O'FA�41S
-T-y� MAnSHES V f�IVEUsE-vGE
REVISED APRIL 2, 2003
NOVEMBER 19, 2002
Owner: Quality Built Construction, Inc.
8 Courtney Square, Apt. 8
Greenville, NC 27858 RECEIVF
APR 0 2 2003
PROJ�GZ l 2a
STROUD ENGINEERING, P.A.
102 SUITE D CINEMA DRIVE
WILMINGTON, N.C. 28403
[phone]
File fAmasterlpw-131gbd\wpd\DENRsw.wpd

NARRATIVE
Project Description
The purpose of this development is to allow for the clearing and grading of the property for the
proposed multifamily residential condominium development. The site consists of approximately 20 acres of
upland soils located adjacent to Barnard's Crcek in the City of Wilmington, just east of the intersection of River
Road and Independence Blvd. Extended (formerly Titanium Road). Approximately 18 acres will be disturbed
during the construction period with the wetlands slated for protection. Storm water from the impervious
portions of the project will be collected via a subterranean pipe system and conveyed to five wet storm water
detention ponds. The ponds will provide treatment of the first inch of rainfall per North Carolina Department
of Environment and Natural Resources, Water Quality Section regulations. The ponds will also provide
detention to insure that the post development runoff from the site does not exceed the calculated pre
development runoff rate.
Site Description
The site has a sloped topography with 10 feet of relief formed as peninsulas situated in and adjacent
swamp and fresh marsh lands. The soils on the site are given by the New Hanover County Soil Survey to be
Craven, Kureb, and Norfolk. The property was logged three years ago yet a number of trees are still evident
within the uplands. The emergent vegetation subsequent the logging activities is primarily six to eight feet tail
at this time and consists primarily of pine, privet, holly and oak. Storm water from the site flows overland as
sheet flow and into the wetlands which drain to Barnard's Creek and then to the Cape Fear River approximately
two thousand feet downstream of the project. Both waters are stream class C-SW.
Adjacent Properties
Land use in the vicinity is zoned Industrial, High Density, and Residential. The property is situated
on the City jurisdictional line with New Hanover County to the east. Land to the north is being developed as
single family residential. Land to the west is undeveloped. Land to the south is being developed as a
commercial marina. The land in the county to the cast is undeveloped and buffered by the wide expanse of
Barnard's Creek.
Design Itinerary
The following design is structured to address both the City of Wilmington storm water detention and
also North Carolina Storm water Management requirements. The format is divided by pond areas and is
repetitive. Initially calculations of the required storage and discharge rates for the latter mentioned criteria,
then a summary of pond area and volume quantities, followed on the next page by pre development and post
development runoff calculations, inflow hydrograph parameters and a storage estimate to address City design
parameters. The proceeding pages are the ten year and fifty year storm routings through the subject pond.
After the fifth pond and on the last page is the piping design. Please find the plan and a reduced scale map
showing the drainage areas in the pocket at the very rear of the report.
famasterlpw 131 gbclwpolswnarra.wpd

,PROJECT: BARNARD'S LANDING, POND 1
PROJECT NO.: PW-13106C
DATE: FEBRUARY 22, 2003
BASIN DATA
TOTAL AREA (AC) = 1 1.84
PROPOSED IMPERV AREA (AC)= 1.210 r
% IMPER AREA = 0.658
PROPOSED PERVIOUS AREA (AC)= 0.63
% PERVIOUS = 0.342
NCDENR STORMWATER MANAGEMENT CALCULATIONS
SPATE REQUIRED STORAGE FOR 1ST IA IN OF RAINFALL
RUNOFF = 0.05 + 0.009 X %IMPERV =
RUNOFF = 0.642
REQUIRED VOLUME = 1.0 IN X RUNOFF X AREA X 43560 SF/AC/12 IN/FT
VOLUME (CF) = 4287
STATE REQUIRED SURFACE AREA
90 % TSS REMOVAL
6.0 FT DEEP POND, 65.8% IMPERVIOUS
SAIDA = 3.69
SURFACE AREA (SF) =SA/DA X AREA X 43560/100
12958
POND DIMESIONS
AND VOLUMES
ELEV.
SA FOREBAY
VOL FOREBAY
SA POND
VOL POND
SUM VOL
(FT)
(SF)
(CF)
(SF)
(CF)
(CF)
0
0
93
1
0
0
233
163
163
2
100
50
436
334.5
547.5
3
207
153.5
704
570
1271
4
354
280.5
1039
871.5
2423
5
533
443.5
1442
1240.5
4107
5.8
678
484.4
2213
1462
6053A
TOTAL
1411.9
TOTAL
4641.5
6053.4
%FORBAY
23.3
POND VOLUMES ABOVE PERMANENT POOL
ELEV.
SA POND
VOL POND
(FT)
(SF)
(CF)
5.8
3016
6
3306
632.2
7
4088
3697
8
4932
4510
9
5831
5381.5
10
6700
6265.5
STATE REQUIRED STORAGE (CF) =
HEIGHT ABOVE PERM. POOL FOR STATE STORAGE (FT) _
STATE STORAGE ELEVATION (FT) =
NCDENR OUTLET ORIFICE DESIGN
TOTAL STORAGE =
2 DAY FLOW (CFS) = 4287/(2 X 24 X 60 X 60) =
5 DAY FLOW (CFS) = 4287/(5 X 24 X 60 X 60) =
Q=AXCd(2XGXH)".5
2 DAY AREA
A= Q/(Cd(2 X G X H)A.5 (SF)
SUM VOL
(CF)
0
632.2
4329.2
8839.2
14220.7
20486.2
4287
1.19
7.00
4287
A = AREA
Cd = ORIFICE COEFF. = 0.6
G = GRAVITY = 32.2 F/SEC^2
H=HEIGHT(FT)= 1.19
0.0066837
USE H = 1.2
0.024809201
0.009923681
DIAMETER (IN) = 1.11
5 DAY AREA
A = Q/(Cd(2 X G X H)^.5 (SF) 0.00267348 DIAMETER (IN) = 0.700301
DRAWDOWN ORIFICE TO BE 1.0 INCH IN DIAMETER
DRAWDOWN RATE(CFS) = 0.020234991
DRAWDOWN TIME (DAY) 2.45

r

PROJECT: BARNARD'S LANDING, POND 2
PROJECT NO.: PW-131QBC
DATE: FEBRUARY 22, 2003
BASIN DA'I'A
TOTAL AREA (AC) = 8.59
PROPOSED IMPERV AREA (AC)= 4,863
% IMPER AREA = 0,566
PROPOSED PERVIOUS AREA (AC)= 3.73
% PERVIOUS = 0.434
NCDENR STORMWATER MANAGEMENT CALCULATIONS
STA'CE REQUIRED STORAGE FOR IST LO IN OF RAINFALL
RUNOFF = 0.05 + {}.009 X %IMPERV =
RUNOFF = 0.560
REQUIRED VOLUME = 1.0 IN X RUNOFF X AREA X 43560 SFIAC112 IN/FT
VOLUME (CF) = 17447
STATE REQUIRED SURFACE AREA
90 % TSS REMOVAL
✓ 5.5 FT DEEP POND, 56.6% IMPERVIOUS
SA/DA = 3.628
SURFACE AREA (SF) =SAlDA X AREA X 43560/100 = 113576
POND DIMESIONS AND VOLUMES
0AR0
=o.;ossro;� v
:4 ��A►�4
'T. FeN
f+!lfeu%+•
ELEV.
SA FOREBAY
VOL FOREBAY
SA POND
VOL POND
SUM VOL
(FT)
(SF)
(CF)
(SF)
(CF)
(CF)
0.5
0
0
1
0
0
2938
734.5
734.5
2
1115
557.5
3874
3406
4698
3
1478
1296.5
4971
4422.5
10417
4
1886
1682
6186
5578.5
17677.5
5
2338
2112
7504
BB45
26634.5
6
2833
2585.5
10480
8992
38212
TOTAL
8233.5
TOTAL
29978.5
38212
%FORBAY
21.5
POND VOLUMES ABOVE PERMANENT POOL
ELEV.
SA POND
VOL POND
SUM VOL
(FT)
(SF)
(CF)
(CF)
6
13591
0
7
15604
14597.5
14597.5
8
17728
16666
31263.5
9
19966
18847
50110.5
10
22200
21083
71193.5
STATE REQUIRED
STORAGE (CF) =
17447
HEIGHT ABOVE PERM. POOL FOR STATE
STORAGE (FT) =
1.17
USE H W
1.2
STATE STORAGE
ELEVATION (FT) =
7,20
NCDENR OUTLET ORIFICE DESIGN
TOTAL STORAGE =
17447
2 DAY FLOW (CFS) = 4287/(2 X 24 X 60 X 60) =
0.100967361
5 DAY FLOW (CFS) = 42871(5 X 24 X 60 X 60) =
0.040386944
0=AXCd(2XGXH)^.5
A=AREA
Cd = ORIFICE COEFF. = 0.6
G = GRAVITY = 32.2
FISEC42
H=HEIGHT(FT)=
1.17
2 DAY AREA
A = 0I(Cd(2 X G X H)-.5 (SF)
0.027404753
5 DAY AREA
A = 0I(Cd(2 X G X H)^.5 (SF)
0,010961901
DRAWDOWN ORIFICE TO BE 2.0 INCH
IN DIAMETER
DRAWDOWN RATE(CFS) =
0,081327414
DRAWDOWN TIME (DAY)
2.48
DIAMETER (IN) =
2.24
DIAMETER (IN) = 1.418043

TOOT
cv
72-1
%A
I Is
PL4
1, - a SS aq
0 w ss
31 IS
9
rb
4f
4f
CN
4f
0 C)
04
C*4
4
Y.
Ia
C�l
Ir �iyz
%CO
C!n
L.A.J

N
O
M
0
0
N
O
N
N
C
Rl
(d
E
C
3
U
m
0
M
r
r

PROJECT: BARNARD'S LANDING, POND 3
PROJECT NO.: PW-131QBC
DATE: FEBRUARY 22, 2003
BASIN DATA
TOTAL AREA (AC) = 1 3.27
PROPOSED IMPERV AREA (AC)= 2.040
% IMPER AREA = 0.624
PROPOSED PERVIOUS AREA (AC)= 1.23
% PERVIOUS = 0.376
NCDENR STORMWATER MANAGEMENT CALCULATIONS
STATE RI,.QIJIREI) STORAGE FOR I ST I A IN OF RAINFALI.
RUNOFF = 0.05 + 0.009 X %IMPERV =
RUNOFF = 0.611
REQUIRED VOLUME = 1.0 IN X RUNOFF X AREA X 43560 SFIACII2 INIFT
VOLUME (CF) = 72571
STATE REQUIRED SURFACE ARF,A
85 % TSS REMOVAL WILL PROVIDE VEGATATIVE FILTER
-� 6 FT DEEP POND, 62.4% IMPERVIOUS
SAlDA = 2.67
SURFACE AREA (SF) =SAIDA X AREA X 43560/100 = 13803
POND DIMESIONS AND VOLUMES
ELEV.
SA FOREBAY
VOL FOREBAY
SA POND
VOL POND
SUM VOL
(FT)
(SF)
(CF)
(SF)
(CF)
(CF)
0
45
420
1
110
77.5
603
511.5
589
2
203
156.5
828
715.5
1461
3
323
263
1134
981
2705
4
473
398
1479
1306.5
4409.5
5
654
563.5
1848
1663.5
6636.5
6
873
763.5
3023
2435.5
9835.5
TOTAL 2222
TOTAL
7613.5
9835.5
%FORBAY
22.6
POND VOLUMES ABOVE PERMANENT POOL
ELEV.
SA POND
VOL POND
(FT)
(SF)
(CF)
6
4033
7
5073
4553
8
6377
5725
9
7711
7044
10
9101
8406
STATE REQUIRED STORAGE (CF)
HEIGHT ABOVE PERM. POOL FOR STATE STORAGE (FT)
STATE STORAGE ELEVATION (FT)
NCDENR OUTLET ORIFICE DESIGN
TOTAL STORAGE =
SUM VOL
(CF)
0
4553
10278
17322
25728
7257
1.47
7.50
7257
2 DAY FLOW (CFS) = 42871(2 X 24 X 60 X 60) =
5 DAY FLOW (CFS) = 4287I(5 X 24 X 60 X 60) =
Q=AXCd(2XGXH)^.5 A=AREA
Cd = ORIFICE COEFF. = 0.6
G = GRAVITY = 32.2 F/SEC^2
H=HEIGHT(FT)= 1.50
2 DAY AREA
A = QI(Cd(2 X G X H)".5 (SF) 0.0100711
5 DAY AREA
A = QI(Cd(2 X G X H)".5 (SF) 0.00402844
DRAWDOWN ORIFICE TO BE 1.0 INCH IN DIAMETER
DRAWDOWN RATE(CFS) = 0.022731703
DRAWDOWN TIME (DAY) 3.69
USE H = 1.5
0.041995399
0.01679816
DIAMETER (IN) = 1.36
DIAMETER (IN) = 0.859637

\PW-131QBC1\dgnIBARNARD.DGN 2/23/2003 5:20:40 PM

a--T
ISTROUDIPW-131QBCIldgnlmeas.dgn 2/20/2003 9:58:53 PM

PROJECT: BARNARD' S LANDING, POND 4
PROJECT NO.: PW-131QBC
BASIN DATA
DATE: FEBRUARY 22, 2003
REVISED: APRIL 24, 2003
TOTAL AREA (AC) = 1.93
PROPOSED IMPERV AREA (AC)= 1.113
% IMPER AREA = 1 0.577
PROPOSED PERVIOUS AREA (AC)= 0.82
°% PERVIOUS = 0.423
NCDENR STORMWATER MANAGEMENT CALCULATIONS
STATE REQUIRED STORAGE FOR 1ST 1.0 IN OF RAINFALL
RUNOFF = 0.05 + 0.009 X °%IMPERV =
RUNOFF = 0.569
REQUIRED VOLUME = 1.0 IN X RUNOFF X AREA X 43560 SFIACII2 IN/FT
VOLUME (CF) = 3988
STATE REQUIRED SURFACE AREA
90 °% TSS REMOVAL
4.5 FT DEEP POND, 57.7°% IMPERVIOUS
SAIDA = 4.693
SURFACE AREA (SF) =SAIDA X AREA X 43560/100 = 13861
POND DIMESIONS AND VOLUMES
,`��rrrerrrrrr,�i
C,A.1304
�10Q^s�SSfp�A.9 :�
ELEV.
SA FOREBAY
VOL FOREBAY
SA POND
VOL POND
(FT)
(SF)
(CF)
(SF)
(CF)
2.5
0
3
394
98.5
4
62
31
818
606
5
209
135.5
1309
1063.5
6
559
384
1844
1576.5
7
1122
840.5
2987
2415.5
TOTAL 1391
TOTAL
5661.5
POND VOLUMES ABOVE PERMANENT POOL
ELEV. SA POND VOL POND
(FT) (SF) (CF)
7 4233 0
8 5591 4912
9 7011 6301
10 8635 7823
STATE REQUIRED STORAGE (CF) =
HEIGHT ABOVE PERM. POOL FOR STATE STORAGE (FT) _
STATE STORAGE ELEVATION (FT) =
NCDENR OUTLET ORIFICE DESIGN
TOTAL STORAGE =
2 DAY FLOW (CFS) = 42871(2 X 24 X 60 X 60) =
5 DAY FLOW (CFS) = 4287/(5 X 24 X 60 X 60) =
Q=AXCd(2XGXH)^.5 A=AREA
°%FORBAY
SUM VOL
(CF)
0
4912
11213
19036
3988
8.00
3988
Cd = ORIFICE COEFF. = 0.6
G = GRAVITY = 32.2 FISEC"2
H=HEIGHT(FT)= 1.00
2 DAY AREA
A = QI(Cd(2 X G X H)^.5 (SF) :
0,00677813
5 DAY AREA
A = Q1(Cd(2 X G X H)A.5 (SF)
0.0027111252
DRAWDOWN ORIFICE TO BE 1.0 INCH IN DIAMETER
DRAWDOWN RATE(CFS) =
0.018560358
DRAWDOWN TIME (DAY)
2.49
0.81
USE H
0.023077517
0.009231007
QC� 1.� '10 y
.
SUM VOL
(CF)
98.5
735.5
1934.5
3895
7151
7151
19.5
DIAMETER (IN) = 1.12
DIAMETER (IN) = 0.705231
m
0
N
cr,
CV
o=
LL-

• - ,, w - 11
IF F
i
5 � ,
l+� r4v k� ram,
6 10 N,,!
J
f f
i ; { 4 ' M��� 4'N o"P
d y p•
1 i
• � i '' I
1 { � i • 1 � I t
N f
1PW-131QBCI1dgn1BARNARD.DGN 2/23/2003 9:47:04 PM

PROJECT: BARNARD'S LANDING, POND 5
PROJECT NO.: PW-131QBC
BASIN DATA
DATE: FEBRUARY 22, 2003
REVISED; APRIL 24,2003
TOTAL AREA (AC) = 1.05
PROPOSED IMPERV AREA (AC)= 0.722
% IMPER AREA = 1 0.686
PROPOSED PERVIOUS AREA (AC)= 0.33
% PERVIOUS = 0.312
NCDENR STORMWATER MANAGEMENT CALCULATIONS
STATE REQUIRED STORAGE FOR 1ST 1.0 IN OF RAINFALL
RUNOFF = 0.05 + 0.009 X %IMPERV =
RUNOFF = 0.669
REQUIRED VOLUME = 1.0 IN X RUNOFF X AREA X 43560 SF/AC/12 IN/FT
VOLUME (CF) = 2551
STATE REQUIRED SURFACE AREA
90 % TSS REMOVAL
4 FT DEEP POND, 68.8% IMPERVIOUS
SA/DA = 5.916
SURFACE AREA (SF) =SA/DA X AREA X 43560/100 = 12706
POND DIMESIONS AND VOLUMES
ELEV.
SA FOREBAY
VOL FOREBAY
SA POND
VOL POND
(FT)
($F)
(CF)
(SF)
(CF)
2.0
104
3
5
2.5
300
202
4
124
64.5
635
467.5
5
394
259
1111
873
6
771
582.5
2285
1698
TOTAL 908.5
TOTAL
3240.5
POND VOLUMES ABOVE PERMANENT POOL
ELEV,
SA POND
VOL POND
SUM VOL
(FT)
(SF)
(CF)
(CF)
6
3105
0
0
7
4181
3643
3643
8
5313
4747
8390
9
6503
5908
14298
STATE REQUIRED STORAGE (CF) = 2551
HEIGHT ABOVE PERM. POOL FOR STATE STORAGE (FT) = 0.70
STATE STORAGE ELEVATION (FT) = 6.80
NCDENR OUTLET ORIFICE DESIGN
TOTAL STORAGE = 2551
2 DAY FLOW (CFS) = 4287/(2 X 24 X 60 X 60) =
5 DAY FLOW (CFS) = 4287/(5 X 24 X 60 X 60) =
Q = A X Cd(2 X G X H)".5 A=AREA
Cd = ORIFICE COEFF. = 0.6
G = GRAVITY = 32.2 F/SEC"2
H=HEIGHT(FT)= 0.80
2 DAY AREA
A= Q/(Cd(2 X G X H)".5 (SF) 0.004847728
5 DAY AREA
A = QI(Cd(2 X G X H)".5 (SF) 0.001939091
DRAWDOWN ORIFICE TO BE 0.75 INCH IN DIAMETER
DRAWDOWN RATE(CFS) = 0.009338
DRAWDOWN TIME (DAY) 316
%FORBAY
USE H =
0.014762587
0.005905035
SUM VOL
(CF)
204.5
736.5
1868.5
4149
4149
21.9
0.8
c*�
o
I
p--q
NI
cnCc
N
Cc
cr
��
CL
Q
O
DIAMETER (IN) = 0.94
DIAMETER (IN) = 0.596411

r

m
C
O
C
2
U m
in } _
O
w
a Y
� w N
U U cc*4
H n
W O
to
r� CE
z
v O
Z
W a C7
A z_
W 2
J_ r
C7 4 � z
LL o a
Q w
w
0.1 U LL
Q
O
l/1 Fy J
N N W ,� O
mr V� Q N&( r .N-- (O W O OO M 2 2
N O m (O
uiMiMiMiM)MiMi
0vcp0LoM ry 7 gwnL 04 m
uitriv v
rv-: .. � ��7r
...�
OtOOWOO6
M00w0tov�v�����v
tf)t(itriv
m r m N n m N
r O O r r C7 (p l() r m O m m N
m 0 0 M
m O
ppprn� ppCV 00vnn0
cr) M (D 1n N M M V n n N n
m�nN
N N
Cf (V � O to M)
10 CO
N 7 CO r d m CO N st
N CO c0
T
O O O)M)(im9
nNO O)m m C)M O)O W V ONO
O)mmm
NNNNMMMi'v(V
NMMM�(V (V (V NstM(p
[VMMM
N N N O m m
lA m N to m O V O N tt7 a0 N d
N (+1
in tp ap cp
r r r r
rvnr-vmv
vm(aniotntnMo(onv
vr Or
Ovvnvnnv
�r CoM.— rr vr rr-_ aro
(nm'jo
r r N r�ivqmcooi
N
r r r r
Mcl m Vn
OONmvVmmmmmc (m"w
MmmM
0000000
000000000000000
0000
(n0 a0 O
OD an0 (� (O COO [D M h Uf
N N N (V
-OCV �M(D ao
qW Ntf)c[i 0Mr.-(M CV t;M
to 00
(ma(��cmo(Dw( cmp
c�c�� c�
a o 0 0 0 0 0
I(mo
o o o o 0 o o d d d d o o 0
0 o o 0
fVNNCV(mVCYN
NNNNNN(V cV NNNNNNN
N(V (V
nr-nr+r+r`r-
tilhtinr-Af+f--r�Nr,Nr-nt-
P- r—
O M) O t l) r l] if) to
O O O O O O O O O O O M7 O O O
O O O O
O
('� r `,' n r h ww v N cD N N C7 N � N m n M) M) In CD
o o o o o r r pOp G rp pCp? Orr Cp o r
C7 r " ch ('O) � GO tI1 N t7 CO N N (h � N 7 N ((D �
000000 00000 - 0 0 0 0 a 0 d d 00
q� abiM W 00h"v,vvi0,0, r-wooE
�QUca�QaMU
c�U000��
N
N V (+i Vl +D M `�" "t`7 •--R h b r, 00 Ct N M
cca�caw�pq Ocemtx�Oa.-.�gw....m..,....m.,..w
C]UUUU(]-, p UUU V GI-- OC]U(aCaU:iU L) U

rn LL
L) t4j
u
� } 2
CO
w O
D
a
f W
N
8It
(i N
W (7
LO
A
z z o
O
A(n Z
z
0 j
O
F- w
ti
O
W PM
L
�[ N.N-4 4r('7tl
T1-(V O
N(°`!S
�('?f'?�QO�
Lr)V)LA0tomvvv
toLOLriLi
LOL(iLf)
vvvvv
ri.�n
�Lq t'-: ��
�°i��
N
a�M10
888
0tom v
(D(Dtf) tc)
Lnlnlo
vvvvLf)
vNad
nCC(a7f�af7N(NgQ�cq
�(00)?C'1
f+9 V_N
M�CDItLN()r fYr
vr0c!(q
IA qAM
cO(�7�r
MNL
nlnCV)
a)0LO
N94!1128 OM8
Mv) RR N
o� �
Nrr r
rrr-
ryp
Ln(ALnnLnNM0
V)N(O
v
Lr)n
�(++yyqqr
LAN�(nln
�QjC
(•i v
r�M v v
Li(1)n
NNNaDNNNNN
r rrr
Lr)LOmm
rr rr
LONLD
N�ODNN
Nr rr
(D�(D
f8
r-r-wm
r eT(V r,
N(7) co
pp�7�
fD NSA
(f8CAI
f�O]CAw w-NNNN
r{r.n---
aDN�
--v
rrr
prhr Qj
�Nrr
(+')rM
(7 c! m N n N N In
f'7 (1) L() (D
(Y) ( ) U)
8
000060000
0 0
O 6 6
" r C3 r r
O O O
sSSc�.CRNnrnnr
LO
vc�i�oo
i8i
MU') )v8
8,22
0 r r m n
(V to (D n
N r
(r) LA a) M—
U7 (D L7i
000000000
0000
000
00
Q
Z
NNNNNNNNN
(V N(NVN
NN
�-N
r`r`�r�rr�tir-r;
tir~r,n
(mV
nr-r--
L)
LLr-v
00000
0
J _J J _..) ..J
2
LL LLLL LLLL
LO
In 0 W 0 LA In W to to
LO LO If) U7
U') LA U')
F" F•-' W F- F-
47 r
Z Z Z Z Z
LL U7
N
W W W LL)W
G
m m m m m
aaLLLLLL
0
00000
J J J J J
W W W W W
> > > > >
0
W W W W W
v
❑ ❑ ❑ ❑ Q
W WLUW W
w ir cr w a
0R��MPgtia
r (0
A
c�aaaa
�C�
0 OOOOr N(V m
Orr •-
L700
vaO00
CN 1 V)
Z
��pp ��pp
00 t)D ("7 hNMN
((��
0
00 cio0000
1n��(�11
dodo
a W
�0
O Z
N n Ln
W ❑ ❑
a
co (0 U) U) U)
w
U�f�C]C1GaAAw
AC1L]w
fa�
zw�
LaLWiLwiLWiLWiUi
J
in
Or NN<T LO
UZZ
Z 0 0
ri o
A w o
A n o
G O Q Q Q Q
j
ZZzzzz
JZ W W
AACaGa
uu 4:5 50npn
aO+Vc�
aaaaaaa
L=)Udd