20030147 Ver 2_Annual Monitoring Summary_20150416

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DUNG WATER STRATEGY, HYDRO
LICENSING AND LAKE SERVICES
ENERGY
Duke Energy Corporation
526 South Church Street
Chadotte, NC 28202
Maihn'g Address
EC12 YIP. 0 Boic 1006
April 14, 2015
Mr Jay Zimmerman, Director
North Carolina Division of Water Resources -
512 N. Salisbury St
Raleigh, NC 27604
.TIP pF
Re: Duke Energy Progress, Inc.
Yadkin -Pee Dee Hydroelectric Project (FERC No 2206) p1��s� O�PEG
Annual Water Quality Summary
Dear Mr Zimmerman
In 2014, Duke Energy Progress, Inc. (Duke Energy) operated the dedicated dissolved oxygen (DO)
enhancement equipment at the Tillery and Blewett Falls Hydroelectric Stations during power generation
periods from May 1st through November 30th. Experience and procedural refinements gained from
regular upstream water quality monitoring and operations during previous years have resulted in
successful implementation of the DO enhancement system for the year.
The enclosed report graphically depicts water quality results, including a daily range and average of DO
concentrations, as continuously measured downstream of the Tillery and Blewett Falls Hydro Stations
during the 2014 monitoring season by the United States Geological Survey (USGS).
Questions can be directed to Tami Styer at (704) 382 -0293 (Tame Styer @Duke- Energy.com) or George
Galleher at (704) 382 -5236 (George.Galleher @Duke - Energy com).
Sincerely,
Jeffrey G Line erger, P E.
Director, Water Strategy and Hydro Licensing
Duke Energy
Enclosure
cc w/ enclosure. Karen Higgins – NC DENR
Jennifer Burdette – NC DENR
George Galleher - Duke Energy
Keith Finley - Duke Energy
Tami Styer - Duke Energy
Phil Fragapane - Duke Energy

DUKE,
ENERGY
YADKIN -PEE DEE PROJECT
FERC No. 2206
2014 Water Quality Data
Data provided by:
M USGS
for changing rvortt!
U.S. Geological Survey
Charlotte, NC
1

Yadkin -Pee Dee Project
(FERC No. 2206)
2014 Water Quality Data
1.0 INTRODUCTION
This document provides a graphical overview of continuous water quality monitoring below
the Duke Energy Progress, Inc. (Duke Energy) Yadkin -Pee Dee Project (Project)
developments for the 2014 monitoring season. In accordance with the Tillery and Blewett
Falls Developments Dissolved Oxygen Compliance Implementation Plan (Progress Energy
2012), turbine draft tube venting modifications were implemented at the Blewett Falls
Development in 2010, while in 2011 a reservoir oxygen diffuser system was installed at the
Tillery Development, in order to assure compliance with dissolved oxygen (DO) water
quality standards in the Project tailwaters with operation under the New License from the
Federal Energy Regulatory Commission (FERC). Continuous tailwater quality monitoring
below the Tillery and Blewett Falls developments is conducted annually between the months
of May and November.
2.0 METHODOLOGY
The Charlotte Field Office of the United States Geological Survey (USGS) provides
continuous water quality monitoring data at two sites on the Pee Dee River, respectively
downstream of Lake Tillery (USGS 021237840 near Norwood at the Highway 731 Bridge)
and Blewett Falls (USGS 0212880025 near Pee Dee at Powerhouse Dam). These sites
provide water quality data for evaluation of compliance with applicable State of North
Carolina surface water standards for DO for the Project (NCDENR 2007). At either
monitoring site, flow, water temperature, and DO are recorded at 5 or 15 minute intervals.
DO percent saturation, as determined from the DO concentration and water temperature
relationship, is also reported at each site. Standard methods employed by the USGS for
continuous monitoring sites are followed for instrument maintenance and calibration, and
data quality assurance (Wagner et al. 2006). Provisional, real -time data are uploaded to a
USGS website. Real -time data will be available to the public with receipt of the New
License and can be accessed via the USGS web sites for the two monitored locations. These
web addresses are:
USGS 021237840 near Norwood (Tillery tailwater):
2

http: / /waterdata.usgs.gov /nc /nwis /dv/ ?site no= 0212378405 &agency_cd= USGS &referredm
odule =sw
USGS 0212880025 near Pee Dee (Blewett Falls tailwater):
http: / /waterdata.usgs.gov /nc /nwis /dv / ?site _ no = 0212880025 &agency cd =USGS &referred m
odule =sw
For this summary report, approved data spanning the entire 2014 monitoring season were
supplied to Duke Energy by the USGS Charlotte Field Office.
3.0 RESULTS
Tillery Hydro Tailwater
Figures 1 through 4 show the daily average, as well as the daily minimum and maximum
value for gage height, water temperature, DO, and DO percent saturation for the Tillery
Hydro tailwaters during the seven -month monitoring period. Daily average DO
concentrations remained at or above 4.0 mg/L at all times, and exceeded the daily average
water quality standard concentration of 5.0 mg /L for 93% of the days during the monitoring
period. Instantaneous tailwater DO concentrations less than 4.0 mg/L as well as daily
average DO values below 5.0 mg/L during the monitoring season coincided with periods of
non - generation.
Blewett Falls Hydro Tailwater
Figures 5 through 8 show the daily average, as well as the daily minimum and maximum
value for gage height, water temperature, DO, and DO percent saturation for the Blewett
Falls Hydro tailwaters during the seven -month monitoring period. Daily average DO
concentrations at this site remained above the 5.0 mg/L water quality standard throughout
the monitoring period. A minor instance of six 5- minute instantaneous DO concentrations
between 3.6 and 4.0 mg/L was recorded on the afternoon of June 24`h. These values are
extremely unusual and do not appear to be related to Project operations. Instantaneous DO
concentrations otherwise exceeded the 4.0 mg/L water quality standard for more than 99.99%
of the monitoring period
4.0 REFERENCES
[NCDENR] North Carolina Department of Environment and Natural Resources. 2007.
"Redbook" Surface waters and wetlands standards. NC Administrative Code 15A
NCAC 02B .0100, .0200 & .0300, Amended effective May 1, 2007. NCDENR,
Division of Water Quality. Raleigh, NC.
3

[Progress Energy] Progress Energy Carolinas, Inc. 2012. Yadkin -Pee Dee Hydroelectric
Project 2206. Tillery and Blewett Falls Developments Dissolved Oxygen Compliance
Implementation Plan. Progress Energy. January 20, 2012.
Wagner, R.J., Boulger, R.W., Jr., Oblinger, C J , and Smith, B.A. 2006. Guidelines and
standard procedures for continuous water - quality monitors — Station operation, record
computation, and data reporting: Techniques and Methods 1 –D3. U.S. Geological
Survey, US Department of the Interior. Reston VA.
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Figure 1. Daily average, minimum, and maximum Tillery tailwater gage height.
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Figure 2. Daily average, minimum, and maximum Tillery tailwater temperature.
Figure
4. Daily average, minimum, and maximum Tillery tailwater DO
saturation.
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Figure 5. Daily average, minimum, and maximum Blewett Falls tailwater gage
Figure 7. Daily average, minimum, and maximum Blewett Falls tailwater DO.
height.
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Figure 6. Daily average, minimum, and maximum Blewett Falls tailwater
Figure 8. Daily average, minimum, and maximum Blewett Falls tailwater DO
temperature.
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