20030147 Ver 0_More Info Received_20100317

?40®r Progress Energy
21
March 15, 2010
Mr. John Dorney
NC Division of Water Quality
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Dear Mr. Dorney:
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MAR 1 7 2010
DENR - WATER QUAUTY
1M1tETLANDS AND STDRNMATER BRANCH
SUBJECT: Proposed Dissolved Oxygen and Temperature Compliance Monitoring Locations
Yadkin-Pee Dee Hydroelectric Project No. 2206
401 Water Quality Certificate (No. 3730 Mod 1) Requirements
Progress Energy recently submitted the 2009 Dissolved Oxygen Enhancement (DO) Verification
Report for the Yadkin-Pee Dee Project No. 2206 (Tillery and Blewett Falls Hydroelectric
Developments) to the N.C. Division of Water Quality on February 3, 2010. The report detailed
the DO testing verification performed in 2009; the proposed power plant modifications to
achieve the North Carolina DO water quality standards; and the proposed DO and temperature
compliance monitoring locations below each hydroelectric development.
In accordance with the schedule outlined in Progress Energy's DO Enhancement Program
provided in its 401 Water Quality Certificate application to NC DWQ1 and requirements of the
subsequently NC DWQ issued 401 WQC Certificate,2 Progress Energy proposes the following
compliance monitoring locations for the Tillery and Blewett Falls Hydroelectric Developments:
Hydroelectric Development Proposed DO Compliance Monitoring Location
Tillery N.C. Highway 731 Bridge (mid-channel)
Blewett Falls Tailrace Buoy Line (mid-channel)
1 Letter to Mr. Todd St. Johns, N.C. Division of Water Quality from Mr. Phil Lucas, Progress Energy, May 11, 2007.
Subject: Yadkin-Pee Dee Project (FERC No. 2206-030), Section 401 Water Quality Certification Application.
2Letter to Mr. Charles Gates, Progress Energy from Cyndi Karoly, N.C. Division of Water Quality, September 30,
2008. Re: Yadkin-Pee Dee Project for Tillery and Blewett Falls Reservoirs, Rockingham, Stanly, Anson,
Richmond, and Montgomery Counties, DWQ #2003-0417, Version 2.0; Federal Energy Regulatory Commission
Project 2206, Approval of 401 Water Quality Certification-Modified.
Progress Energy Carolinas, Inc.
Tillery Hydro Plant
179 Tillery Dam Road
Mount Gilead, NC 27306
The proposed compliance monitoring locations will provide long-term monitoring of temperature
and DO concentrations in the next FERC license term of the Project. The Tillery Plant
compliance location is located approximately 2,000 feet downstream of the Tillery Plant while
the proposed Blewett Falls monitoring location is located approximately 500 feet downstream of
the plant (Enclosures 1 and 2). Both proposed compliance monitoring locations are consistent
with location requirements specified in the NC DWQ issued 401 WQC2.
The proposed location of these compliance monitoring locations are the result of extensive water
DO enhancement testing and water quality investigations conducted by Progress Energy from
2006 to 20093. Results of those studies have been previously filed with NC DWQ for review and
discussed during annual review meetings between NC DWQ and Progress Energy. The
proposed locations will provide representative samples for the DO concentrations and
temperature in waters from the power plant tailrace areas.
Progress Energy requests that NC DWQ review and approve in writing the proposed DO and
temperature compliance monitoring locations. Progress Energy can arrange an on-site meeting,
if necessary, to view the proposed monitoring locations prior to NC DWQ approval. Once the
compliance locations are approved, Progress Energy will provide NC DWQ the GIS coordinates
of each location. According to the DO Enhancement Program schedule, Progress Energy intends
to install and test the DO monitoring equipment during 2010-2011 period with formal
compliance reporting beginning in 2012. Progress Energy anticipates contracting with the U.S.
Geological Survey to install and operate the compliance monitoring equipment. It is also
anticipated that the compliance data reporting will be available through the USGS's National
Water Systems web-based interface data system.
3 Yadkin-Pee Dee River Hydroelectric Project. FERC Project No. 2206. Investigations of Measures to Enhance
Dissolved Oxygen Concentrations in the Tailwaters of the Tillery and Blewett Falls Hydroelectric
Developments. PHASE I: Turbine Venting. Devine Tarbell & Associates. April 2007.
Yadkin-Pee Dee River Hydroelectric Project. FERC Project No. 2206. Investigations of Measures to Enhance
Dissolved Oxygen Concentrations in the Tailwaters of the Tillery and Blewett Falls Hydroelectric
Developments. PHASE II: Surface Mixing and Compressed Air. Devine Tarbell & Associates. June 2008.
Yadkin-Pee Dee River Hydroelectric Project. FERC Project No. 2206. Investigation of Measures to Enhance
Dissolved Oxygen Concentrations in the Tailwaters of the Tillery and Blewett Falls Hydroelectric
Developments. PHASE III: 2008 Reservoir Air Diffuser with Surface Mixing. HDR/DTA. June 2009.
Progress Energy. Yadkin Pee Dee River Hydroelectric Project FERC Project No. 2206, Raleigh, North Carolina.
Dissolved Oxygen Enhancement Field Verification Methods for the Tillery and Blewett Falls Hydroelectric
Developments. Phase IV-2009: Baffle plates, aeration ring, partial trashrack blockage and air diffuser
deployment.
Please contact Mr. John Crutchfield (919-546-2019) if you have any questions regarding the
proposed compliance monitoring locations of if you wish to arrange a site visit to view the
locations.
Sincerely,
en Ke ed
Hydro Operations Manager
Enclosures
c: John Crutchfield
Enclosure 1. Proposed dissolved oxygen and temperature compliance monitoring location
at the Tillery Hydroelectric Development for 401 Water Quality Certificate
requirements in the next FERC license term.
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Enclosure 2. Proposed dissolved oxygen and temperature compliance monitoring location
at the Blewett Falls Hydroelectric Development for 401 Water Quality
Certificate requirements in the next FERC license term.