20110795 Ver 1_Stormwater Approval_20110907

M
A NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
September 7, 2011
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. Mark Landseidel
Duke Energy Carolinas, LLC
526 South Church Street
Charlotte, NC 28201
Subject Property: Dan River Combined Cycle Project
MODIFIED STORMWATER MANAGEMENT PLAN APPROVAL
Dear Mr. Landseidel:
DWQ Project # 09-0940
Rockingham County
On December 3, 2009, the Division of Water Quality (DWQ) issued a 401 Water Quality Certification to
impact 0.133 acre of jurisdictional wetlands for the purpose of constructing the above named project.
Condition 6 of the 401 Certification requires that the stormwater management facilities approved by the
DWQ on December 3, 2009 be constructed and operational before any building is occupied at the site.
On June 5, 2011, the DWQ received a request for a revision to the Stormwater Management Plan (dated
June 29, 2011). The purpose of the revision was to replace the originally proposed bioretention area with
a wet detention pond to better suit the groundwater conditions on the site. On August 26, 2011, the DWQ
received an update to the Stormwater Management Plan (dated August 22, 2011).
The proposed revised and updated stormwater management plan for the Dan River Combined Cycle
Project has been reviewed and satisfies the stormwater management condition of the 401 Water Quality
Certification. You are required to meet the following conditions:
The stormwater management system (consisting of two wet detention ponds and all associated
appurtenances), all stormwater conveyances and the grading and drainage patterns depicted on
the plans, as approved by this office must be maintained in perpetuity. No changes to the
structural stormwater practices shall be made without written authorization from the DWQ. The
stormwater management structures shall have maintenance access to allow for the ability to
maintain the structures, and to perform corrective actions. The stormwater easements shall be
recorded to provide protection of the structures from potential alterations by future property
owners.
2. All operation and maintenance activities shall be followed as stipulated in the Operation and
Maintenance Agreement for Wet Detention Pond #I signed by Mr. Stephen A. Townsend, Sr. and
notarized on July 5, 2011, and received in our office on July 19, 2011 and for Wet Detention
Pond #2 signed by you on September 16, 2009 and received on our office on October 8, 2009.
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Dan River Combined Cycle
Page 2 of 2
September 7, 2011
3. You or your authorized agent shall provide a completed Certification of Completion Form to the
DWQ 401 Program within ten (10) days of the project completion (available at:
http://portal.ncdenr.org/web/wq/swp/ws/40 I /certsandperm its/apply/forms).
This letter completes the review of the DWQ under Section 401 of the Clean Water Act. If you have any
questions, please contact me at 919-807-6381.
Sincerely,
YLCXX.??Jv C ?.??
Annette Lucas, PE
Wetlands, Buffers and Stormwater Compliance and
Permitting (WeBSCAPe) Unit
AML/aml
cc: Andy Williams, U.S. Army Corps of Engineers, Raleigh Regulatory Field Office
Sue Homewood, DWQ Winston-Salem Regional Office
File Copy
Jonathan Carter, PE, WSP Sells, 128 Overbill Drive, Suite 105, Mooresville, NC 281 17
Filename: 090940 Dan Rive rCombinedCycle(Rockingham)SW_Approve