20021262 Ver 1_Stormwater Info_20101102

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From Alan for file ...L -
From: Johnson, Alan
Sent: Tuesday, November 02, 2010 2:07 PM
To: Gyamfi, Joseph; Dennison, Laurie
Subject: FW: Rea Road Mixed Use Development - Union County, NC
Joseph take a look and make sure the SW is okay, based on the info provided. The new impervious, is less than
the original proposed impervious
Laurie please place in file: 02-1262
Thanks
AJ
From: Brent Cowan [mailto:[e-mail]]
Sent: Tuesday, November 02, 2010 12:30 PM
To: Johnson, Alan
Subject: Rea Road Mixed Use Development - Union County, NC
Alan,
Per our conversation yesterday, attached find a pdf of a memo with supporting documentation
showing that the existing pond at the subject development is adequately sized.
Please let me know if this pdf submission is acceptable for you to review and forward to
Raleigh, or if you need for me to mail to you originals.
Thanks,
Anthony Brent Cowan, P. E., LEED'" AP
The Isaacs Group, P.C.
8720 Red Oak Blvd., Ste. 420
Charlotte, NC 28217
P:704-227-9402 F:704-227-9403
Web: www.isaacsgrp.com
https://mail.nc.gov/owa/?ae=Item&a=Open&t=IPM.Note&id=RgAAAAAAOgPoLNIPQZ... 11/2/2010
77D
? T" JSAACS"
November 02, 2010
NCDENR-DWQ
Attn: Alan Johnson
Mooresville Regional Office
610 East Center Ave.
Mooresville, NC 28115
Re: Rea Road / Tom Short Road Mixed Use Development-401 Certification
Union County, North Carolina
DWQ Project No. 021262
Dear Mr. Johnson,
Per your direction in our conversation yesterday morning, this memo has been prepared and
submitted to your office to notify you of proposed changes to the development plan for the
existing project located at the intersection of Tom Short Road and Rea Road in Union
County. The development was originally designed in 2002 by Carter & Burgess Inc. and
received NCDENR approval in February of 2003 (see attached approval letter). The site was
constructed as approved and The Isaacs Group is currently modifying the design to
accommodate a new Kohl's retail store. Our re-design does not result in any impact or
modification to the existing stormwater BMP wet pond.
Based on our phone conversation and as per your direction, we have evaluated and
calculated the impervious area of the revised site layout (see enclosed drawings) to confirm
that the new development does not result in more impervious area than the pond was
originally designed to accommodate. The approved impervious area per DWQ 021262 was
13.4 acres and the new layout (including existing roads, walkways and buildings) has been
calculated to be 10.50 acres. Therefore, since the new contributing impervious area is less
than the approved impervious area, it is our contention that the existing detention pond is
sufficient as constructed and that the site is vested from additional stormwater requirements.
Please review the enclosed information and let us know if you have any comments, questions
or concerns. I can be reached at 74-227-9402 or [e-mail] if you would like to
discuss anything further.
Thank You,
Anthony rent Cowan, P.E.
Sr. Project Manager
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October 7, 2002
DWQ# 02-1262
Union County
Rea Road 1, LLC
C/o Mr. Christopher S. Grose
5606 Carnegie Blvd., Suite 110
Charlotte, NC, 28209
APPROVAL of 401 Water Quality Certification with Additional Conditions
Dear Mr. Grose
You have our approval, in accordance with the attached conditions, to place fill in 0.43 acre of wetlands and 15 linear feet of
perennial streams in order to construct the Rea Road Extension Commercial Development in Union County, as described in your
application received by the Division of Water Quality on August 12, 2001. After reviewing your application, we have determined that this
fill is covered by General Water Quality Certification Number 3362, which can be viewed on our web site at
httpY/h2o.enr.state.nc.us/ncwetlan ds. This Certification allows you to use Nationwide Permit Number 39 when issued by the U.S. Army
Corps of Engineers. In addition, you should get any other federal, state or local permits before you go ahead with your project Including
(but not limited to) Sediment and Erosion Control, Non-Discharge and Water Supply Watershed regulations. Also this approval will expire
when the accompanying 404 permit expires unless otherwise specified in the General Certification.
This approval is only valid for the purpose and design that you described in your application. If you change your project, you must
notify us in writing and you may be required to send us a new application for a new certification. If the property is sold, the new owner
must be given a copy of the Certification and approval letter and is thereby responsible for complying with all conditions. If total wetland
fills for this project (now or in the future) exceed one acre, compensatory mitigation may be required as described In 15A NCAC 2H .0506
(h). For this approval to be valid, you must follow the conditions listed in the attached certification as well as the additional conditions
listed below:
An additional condition is that a final, written stormwater management plan shall be approved in writing by this Office before the
impacts specified in this Certification occur per Condition No. 3 in General Certification No. 3362. The stormwater management plan
must include plans and specifications for stormwater management facilities that are appropriate for surface waters classified as Class
C and designed to remove 85%a TSS according to the most recent version of the NC DENR Stonnwater Best Management Practices
Manual. These facilities must be designed to treat the runoff from the entire project, unless otherwise explicitly approved by the
Division of Water Quality. Also, before any permanent building is occupied at the subject site, the facilities (as approved by this Office)
shall be constructed and operational, and the stormwater management plan (as approved by this Office) shall be implemented. The
structural stormwater practices as approved by this Office as well as drainage patterns must be maintained in perpetuity. No changes
to the structural stormwater practices shall be made without written authorization from the Division of Water Quality;
Upon completion of all work approved within the 401 Water Quality Certification or applicable Buffer Rules, and any subsequent
modifications, the applicant is required to return the attached certificate of completion to the 401 /Wetlands Unit, North Carolina
Division of Water Quality, 1650 Mail Service Center, Raleigh, NC, 27699-1650;
Deed notifications or similar mechanisms shall be placed on all retained jurisdictional wetlands, waters and protective buffers in order
to assure compliance for future wetland, water and buffer impact. These mechanisms shall be put in place prior to impacting any
wetlands, waters and/or buffers approved for impact under this Certification Approval and Authorization Certificate. A sample deed
notification can be downloaded from the 401 /Wetlands Unit web site at http://h2o.enr.state.nc.us/ncwetlands;
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must act within 60 days
of the date that you receive this letter. To ask for a hearing, send a written petition which conforms to Chapter 1508 of the North Carolina
General Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. This certification and its
conditions are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act. If you have questions,
please call Samar Bou-Ghazale in DWQ's Mooreseville Regional Office at 704-663-1699 or Cyndi Karoly at in Raleigh 919-733-9721.
P.E.
N. C. Division of Water Quality 1617 Mail Service Center Raleigh, NC 2f699 1617 [phone]
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
Customer Service
1 800 623.7748
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Project ;Name: Rea Road
Project No. DWQ QZ 1;?41,Z
SUBMITTED DESIGN: REQUIRED DESIGN:
elevations ;-3;6, average depth status
Bottom of Basin (ft) 597
Permanent Pool (ft) 601 4 ft. depth ok
Temporary Pool (ft) 603 2 ft, depth ok
areas
Pe
Permanent Pool SA (sq ft)
27460
24397 sq. ft.
ok
Drainage Area (ac) 15.9 _
c based on av de th ok #J
Impervious Area (ac) 84.3 Cc $1 N
A .Lgl Ac
413
volumes
Permanent Pool (cu ft)
100078 ?,r
oK
?
Temporary Pool (eu ft) 105332 16664 cu. ft. ok --°?- `
Forebay (cu ft) 56332 56.3ro check forebt
other parameters
SAIDA 0 3.52
Orifice Diameter (in) 3 0.24 cfs drawdown
Design Rainfall (in) 1 52 day drawdown check drawl
Linear Interpolation of Correct SAIDA**'
e ft. Permanent Pool Depth
% Impervious SA/DA fror (Avg, Depth)
Next Lowest 80 3.36 3153810634 2.78
Project Impervious 84.3 3.52 2.92
Next Highest 90 3.74 3.512480699 fI
3 ft 4