20100617 Ver 1_More Info Letter_20100910

ALT! ?-Iwy VA
WDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
Mr. Trey Morgan
Denver I Realty, LLC
14120 Ballantyne Corporate PI., Ste. 460
Charlotte, NC 28277
Subject: Hold, Walgreens Store #13036
Dear Mr. Morgan:
Dee Freeman
Secretary
September 10, 2010
DWQ # 10-0617
Lincoln County
On August 6, 2010, your application for a 401 Water Quality Certification was received for the
proposed site. Upon review of the application and prior to a site visit, on August 19, 2010 staff contacted
your consultant, Mr. Mark Romulus, requesting additional information. On September 8, 2010, a site
inspection was conducted and based on a review of the site and the plan, the following is required:
¦ Post construction storm water measures are required for the entire site. Storm inlets D1, D2,
D3, and B2 are shown as discharging into the existing street system that ultimately discharges
into a stream. There is no indication of the discharge points for inlets C1, C2, and C3.
¦ The proposed culvert does not line up with the stream (or better scale is required). There is
concern of bank erosion from the discharge during a storm event. Adjustment to the culvert is
required or some minor relocation of the stream is needed.
¦ Given the size of the culvert (72") and the size of the stream (< 24" wide), flood plain benches
are required immediately up and down stream of the culvert.
¦ Check dam is shown in the stream on the dam stream end of the culvert. If the coffer dam is
constructed properly this should not be required. The check dam and coffer dam are both
impacts (though temporary) that should be accounted for in the impact section of the
application.
¦ The grass Swale from the sand filter is shown constructed to the top of bank of the stream.
Can the Swale be terminated prior to entering the buffer? Is a lever spreader proposed to
minimize scour as the discharge enters the stream channel. Upon grading of the Swale, it shall
be matted and seeded immediately to prevent sediment from entering the stream.
¦ Pump around of the stream should be discharged through a well buffered area prior to entering
the stream or the flow pumped through a silt/filter bag and released.
¦ During discussions at the site it was stated that the culvert is at 5% grade which may cause
scouring of the stream without a dissipation pad. Given the culvert size and slope there is
concern that the proposed rip rap may not be sufficient. Can the slope be reduced? Will the
stream channel be stable without a velocity dissipater?
Mooresville Regional Office
Location. 610 East Center Avenue, Suite 301, Mooresville, NC 28115
Phone: [phone]\Fax: [phone]\ Customer Service: 1-877-623-6748
Internet: www.ncwaterouality.org
NorthCarolina
;Vaturallry
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
Pursuant to 15A NCAC 2H .0507(h), please be advised that this project will be placed on hold. Failure
to submit the requested information by November 1, 2010 may result in the application being withdrawn
from consideration. You may reapply, but a new fee and application will be required. In addition, this office
is requesting that the Army Corps of Engineers withhold processing the 404 permit until the requested
information is provided. If you have any questions, please contact me at [phone].
Sincerely,
Alan D. Johnson'
Surface V&6 Protection
cc: Ian McMillan -Wetlands Unit
Mark Romulus - Landquest Ventures, LLC, 300 Holmes Blvd., Yorktown, VA 23692