20071441 Ver 2_More Info Received_20080102

Environmental Consultants, PA
Suite C Concord. North Carolina 28025 Phone: [phone] Fax: [phone]
N.C. Division of Water Quality pSt~U]STORMWA7EkBkFWCF1
401 Oversight and Express Permits Unit
Attn: Cyndi Karoly
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
RE: Ridge Road Apartment Site-Mecklenburg County, NC DWQ#07-1441 v2
Dear Mrs. Karoly:
We are in receipt of a recent Storm Water Management Plan Modification for the
aforementioned project. The modification follows an October 22, 2007 Water Quality
Certification from the DWQ. Recently project engineers discovered potential flooding
issues related to the proposed plans upon completion of a flood study. Specifically,
neighboring townhomes could be flooded upon construction of the proposed Cottage
Oaks Drive and Thomas Ridge Road crossings. Due to this fact the applicant and project
engineer have had discussions with City of Charlotte regarding changes to the proposed
plans. The attached letter outlines the current status and proposed changes to the project.
Namely one of the proposed crossings will not be constructed, a second crossing will
result in increased stream impacts and the proposed thoroughfare impact will not change.
If City planning, DOT, etc are agreeable to the proposed changes a modification to the
401 approval will be submitted. No impacts will be performed without proper approvals
from all agencies. In summary, our client and S&EC wanted to provide NC DWQ with a
status report for the project. Once plans are finalized we will submit a request for
modifications to the Water Quality Certification.
Please contact me if you have questions or comments regarding the information provided.
Sincerely,
~~~
Wendell Overby
NC Licensed Soil Scientist
NC Registered Forester
Attachments
Greensboro Office: Raleigh Office:
3817-E Lawndale Drive 11010 Raven Ridge Road
Greensboro, NC 27455 Raleigh, NC 27614
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
©C~ ~~ ~ D December 20, 2007
JAN 2 2008 S&EC #5-1925wx

T'URNBULL • SIGMON D E S I G N
December 18, 2007 •
Mr. Wendell Overby
Soil & Environmental Consultants, PA
236 Le Phillip Ct NE,
Concord, NC 28025
Re: 07-085 Prosperity Village
Mr. Overby,
Please accept this letter as confirmation of our conversation regarding modifications to the
approved 401 Water Quality Certification for Prosperity Village Development (DWD# 07-
1441V2) and USACE Action ID# SAW 2007-2888 permit. Those approvals allowed for the
impact of 0.174 acres of wetlands and 296 linear feet of unnamed stream to Stony Creek in
order to construct the Prosperity Village Development The permit application and
subsequent information was based on the construction of three stream crossings. The
crossings consisted of a City of Charlotte Thoroughfare, Prosperity Ridge Road (149 LF of
impact), a City of Charlotte Collector, Thomas Ridge Road (80 LF of impact) and a City of
Charlotte Local Road, Cottage Oaks Drive (67LF of impact) with aforementioned wetland
impact acreages.
Since receiving the approvals and per the requirements of the City of Charlotte a detailed
1 D0+1 flood analysis was performed on the unnamed stream to Stony Creek. The conclusion
of the analysis was that an increase in the 100-year water surface elevation along the stream
would place existing neighboring rnutfi family dwelling structures out of compliance with the
City of Charlotte requirements. In an effort to design Cottage Oaks Drive and Thomas Ridge
Road in a manner that would not increase the chance of flooding several scenarios using
traditional and bottomless culverts and bridge structures were analyzed. It was determined
that there is no feasible solution to the crossing at Cottage Oaks Drive and that the Thomas
Ridge connection could be achieved by the installation of a 4'x16' box culvert. The crossing
of Thomas Ridge would require additional stream disturbance than originally permitted.
Based on the results of the flood study we believe modifications to the approvals are
necessary. Currently discussions are being held between the developer and his consultants
with the City regarding these proposed changes. Upon completion of proposed plans
approximately 140 linear feet of stream disturbance will tie requested for the Thomas Ridge
Road crossing, 0 linear feet of stream disturbance at Cottage Oaks Drive and 149 linear feet
of stream disturbance at Prosperity Ridge Road. The proposed Prosperity Ridge Road
impact will not change from the approved design. In summary, upon satisfaction from the
City regarding the proposed plans a new preconstruction notification modification request will
be submitted to the USACE and NC DWQ.
Sincerely,
~~
Bryan C. Metzler, PE
Principal
cc: Jim Homan, Charter Properties, Inc
Lunt 1001 Morehead SquareDrioe Phone:7o4.529.6$00
i ~ ' ,p Suite 53o Fos: go¢.522.0882
i)• .; „.. Charlotte.NC 28203 turnha!lsigmun.rom