NC0024406_Temporary Pumping System_20081001

Roquest for re -authorization for Temporary Pumping System this w•inte...
Subject: Request for re -authorization for Temporary Pumping System this winter to refill Belews Lake
From: "Lewis, Ron" <[e-mail]> /
Date: Wed, 1 Oct 2008 12:17:30 -0400 �Y '
To. James Mckay [e-mail]> �
CC: <[e-mail]> A(U OV , �2 I I
Jim,
`'
As we discussed this past month, despite recent rain in parts of the Carolinas, Belews Lake has not received its
share, as the lake level is about 3 ft below full pool or about where it was at this time last year. Thus, on behalf of
Duke Energy Carolinas, LLC I'm requesting reauthorization of the temporary pumping system and protocol that
was used to refill Belews Lake this past winter in 2008 (see attached letter of authorization and assessment
report). Also, as a result of a follow-up call with Fred Tarver about installation of a USGS gauge, I contacted
Jeanne Robbins of USGS, who has arranged a site visit this Thursday to select a suitable location for installation
of a USGS gauge. Doug Walters and Geoff Cartano of the USGS staff plan to arrive at Belews Creek Steam
Station between 9:30 and 10:00 AM Thursday to meet with the Duke Energy project team. If you would like to also
attend, please let me know.
In addition, an engineering firm has also been contracted to design a permanent pumping system for installation in
2009. We are currently evaluating several different conceptual designs and I anticipate that we will probably want
to set up a meeting with you in about a month to discuss the conceptual designs for the permanent system. If any
questions or actions are needed immediately for reauthorization of the temporary system, please contact me. Our
target date for operation of the temporary pumping system is December 1, 2008.
Thanks,
Ron
Duke Energy
Mail Code: EC13K
526 S. Church Street
Charlotte, NC 28202
Office 980-373-5710
Mobile [phone]
NCDENR pumping approval Jan 15 2008.pc
Content -Description: NCDENR pumping approval
Jan 15 2008.pdf
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Content -Description: Belews pumping 2008.pdf
Belews pumping 2008.pdf Content -Type: application/octet-stream
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1 of 1 10/1/2008 1:20 PM

BELEWS LAKE WATER QUALITY DURING
PUMPING FROM THE DAN RIVER TO
AUGMENT BELEWS LAKE LEVEL,
JANUARY - MARCH 2008
July 2008
Keith A Finley
Duke Energy
Corporate EHS Services
Huntersville, NC 28078

Table of Contents Page
ExecutiveSummary........:...................................................................................................3
Introduction........................:................................................................................................5
Methodsand Materials........................................................................................................6
Results and Discussion......................................................................................................7
Pumping Operations and Lake Elevation...................................................................7
Thermal and DO Profiles...........................................................................................7
Water Clarity and Suspended Solids....................................................................................... 8
Nutrients and Chlorophyll a....................................................................................................9
Specific Conductance, pH, and Dissolved Minerals......................................................... 9
Conclusions.......................................................................................................................10
LiteratureCited.................................................................................................................10
Tables................................................................................................................................12
Figures...........................................................................................................................................14
Appendix........................................................................................................................... 29
14

Executive Summary
Drought conditions in the Southeastern United States in 1998 — 2002, including the
Carolinas, led to unprecedented lowering of Piedmont groundwater levels and stream base
flows. Declining levels of cooling water in Belews Lake and risks to future operability of
Belews Creek Steam Station (BCSS) prompted Duke Energy to obtain regulatory approval to
supplement the reservoir with water pumped from the nearby Dan River. A temporary
pumping system was operated to supply water to Belews Lake during the winter of 2002 —
2003.
During the latter seven months of 2007, drought conditions once again prevailed, and by
early fall, had led to substantially reduced Belews Lake surface elevations. Possible
unchecked declines in lake levels over the ensuing months were again threatening future
cooling water availability for, and operations of BCSS.
Prior to the initial supplemental pumping, Duke Energy had projected that if the surface
elevation of Belews Lake dropped below 218.5 m (717 ft) above mean sea level (msl), BCSS
would become unavailable for generation due to condenser cooling water (CCW) pump
cavitation.. Subsequently, in early 2002 structures were added to the CCW inlets to suppress
potential vortices, permitting the plant to operate down to a surface elevation of 217.9 m (715
ft) msl.
As in 2002, in January 2008 regulatory approval was granted for winter 2008 (pre -April
2008) pumping of Dan River water to provide aid for Belews Lake water management. The
agreement included a request by the North Carolina Department of Environment and Natural
Resources to monitor Belews Lake water quality on a monthly basis during the pumping
operation to document any pumping -related impacts.
Pumping from the Dan River commenced January 22, 2008 with the lake surface elevation at
220.0 m (721.9 ft) msl, and terminated on March 31, 2008, with the surface elevation at
220.7 m (724.2 ft) msl. Subsequent springtime tributary inflows further accreted Belews
Lake storage volume, with the lake achieving full pond at 221 m (725 ft) msl by April 9,
2008. Pumping from the Dan River and coincident Belews Lake inflows supplied an
estimated 8,780 acre -ft, or about 74% of the volume required to achieve full pond.
3

As in 2002 — 2003, the winter 2008 monitoring effort indicated there were no substantial
water quality changes due to the Dan River pumping operation. Near -average water
temperatures, and dissolved oxygen concentrations well in excess of water quality standards
were observed lake -wide. Indicators of water clarity (i.e., Secchi depth, suspended solids,
and turbidity) measured at routine Belews Lake water quality monitoring sites revealed
virtually no discernable effects attributable to the pumping inputs. During monitoring
associated with 2002 — 2003 pumping, limited changes in those parameters were observed
only in the immediate vicinity of the pumping inflow.
Trends in major nutrients and chlorophyll a concentrations, while indicating a previously
0
documented gradient from uplake to downlake, revealed no temporal fluctuations downlake
potentially linked to pumping inputs. Long-term, slight upward trends in lake -wide specific
conductance and concentrations of several important ionic mineral constituents revealed that
both the former (2002 — 2003), and the more recent. pumping operations, had a negligible
overall impact relative to other factors. Gradual increases in conductance, mineral
constituents other than sulfate, and pH are thought to be linked to evaporative concentration
of normal watershed inputs in Belews Lake. Enhanced evaporative -induced concentration
caused by the preceding 1998-2002 drought, and to a somewhat lesser extent, the 2007
regional drought, appeared to be especially influential in shaping inter -annual trends in these
water quality constituents.
Prior investigation following the 2002 — 2003 Dan River pumping operation had concluded
that water quality impacts were: 1) limited primarily to the immediate vicinity of the pump
outlets in the lake; 2) of transient duration (i.e., days as opposed to weeks); and 3)
insignificant when compared to effects of the 1998 — 2002 drought or seasonal storm runoff -
related events. This follow-up investigation likewise supports those conclusions.
4

Introduction
Due to pre-existing low groundwater levels (USGS 2008a) and exceptionally low
precipitation totals in the latter seven months of 2007 (Figures 1 and 2; NOAA 2008a),
Piedmont North Carolina groundwater levels and stream flows were appreciably reduced in
the later half the year (USGS 2008b). Belews Lake surface elevations in late 2007 were
rapidly declining below seasonal norms, similar to as had occurred in the summer of 2002,
once again threatening potential operability of the Belews Creek Steam Station (BCSS)
(Figure 3).
Previous hydrological data had demonstrated that in a dry year, lake levels could easily drop
by three to four feet between the end of the relatively wet spring season and the end of the
calendar year (Finley 2003). Such conditions were observed in 2002, as a prolonged drought
continued and losses of surface water to groundwater and evaporation accelerated throughout
the summer and continued beyond. A repetition of this very dry weather pattern was evident
during the second half of 2007.
In 2002, with rapidly declining lake levels and no guarantee of rainfall, Duke Energy had
installed structural modifications at the BCSS CCW pump intakes to allow the station to
operate at a minimal surface elevation of 217.9 m (715 ft) msl without significant pump
cavitation occurring. Prior to these modifications, CCW pump operability would have been
jeopardized at a lake elevation of 218.5 m (717 ft) msl. In both 2007 and in the instance of
the previous drought, it became clear that additional measures would be needed to ensure
cooling water access and station operability; specifically, that supplemental water from the
Dan River would provide the only certainty that station operation would continue in the event
of a continuing drought.
In the summer of 2002, Duke Energy representatives had consulted with regulatory agencies,
including the North Carolina Department of Environment and Natural Resources, North
Carolina Wildlife Resources Commission, US Fish and Wildlife Services, US Army Corps of
Engineers, and other stakeholders seeking permission to install a temporary pumping
operation providing Dan River water to Belews Lake. Permission was subsequently granted
for a winter 2002 — 2003 seasonal withdrawal of Dan River water to provide a source for
Belews Lake water management. Operational criteria were stipulated which ensured that
pumping would be reduced or curtailed under low flow conditions in the Dan River, that
pump intakes would be screened to limit entrainment of Dan River biota, and that pumping

would be terminated in advance of the Dan River fish -spawning season. Pumping under the
granted authorization was to be completed by the end of March 2003.
More recently, in response to renewed drought conditions and rapidly declining lake levels in
2007, approval was again sought by Duke Energy and granted by the North Carolina
Department of Environment and Natural Resources (see Appendix) for a repeat temporary
pumping operation in the winter of 2008, under similar terms and operational constraints.
Pumping was to be completed during the period prior to April 1, 2008, utilizing similar
equipment to that employed during the winter of 2002 — 2003. Screened pump intakes were
to withdraw water from the Dan River at a maximum rate of 2.83 m3/s (100 cfs), which was
to be reduced on a sliding scale to zero in the event that river flow fell below 5.95 m3/s (210
cfs). Twelve pumps, each capable of supplying 0.23 m3/s (8 cfs), were installed at the Dan
River (Figures 4 and 5). Pairs of pumps were linked in tandem, combining their two
discharges into a common header, resulting in a total of six 0.45 -in 3/S (16-cfs) discharge lines
leading into Belews Lake, near -the spillway (Figure 6).
This report provides a summary of Belews Lake water quality monitoring conducted in
conjunction with the 2008 Dan River pump operation.
Methods and Materials
Pumping records were obtained from the Duke Energy Electronic Log (ELog) database, and
from the lead pumping project engineer (Harold Presson, personal communication). These
records, primarily non -quantitative in nature; were used to provide a general perspective on
Dan River pumping operations during January — March 2008. Belews Lake level data were
obtained from the Duke Energy PI DataLink system (OSISoft, Inc., San Leandro, CA). Dan
River provisional flow data at Wentworth, NC was accessed from the USGS internet site
(USGS 2008b). Dan River flow data at BCSS was estimated from the Wentworth gauge by
applying a proportional correction for site and gauge drainage areas.
Water quality was monitored twice during pumping operations, on February 14 and March
13, 2008. Sampling was conducted at locations previously established for routine Belews
Lake water quality assessments (Figure 7). At each lake location, vertical, one -meter
incremental profiles of in situ parameters (temperature, dissolved oxygen [DO], pH and
specific conductance) were obtained with a Hydrolab DataSonde° analyzer. Water samples
0

were collected with a Kemmerer bottle for laboratory analyses from surface (0.3 m), and
from one meter above bottom. Samples for soluble constituents were filtered (0.45-µm) in
the field, and samples were preserved (acidified or iced, depending on analytical
requirements) immediately following collection. Sample preservation and analytical
techniques are listed in Table 1.
Results and Discussion
Pumping Operations and Lake Elevation
Pumping from the Dan River was initiated on January 22, 2008, with Belews Lake surface
elevation at 220.0 in msl (721.9 ft msl). Pumping was terminated March 31, 2008, with the
lake elevation reaching 220.7 in msl (724.2 ft msl), nearing full pond (Figure 3). At the start-
up of pumping, during January 22 to February 2, reduced Dan River flow required operators
to reduce pumping rates in accordance with regulatory guidance. For the remainder of the
period, ample Dan River flow allowed for pumping at full system capacity (Figure 8). On
occasion, however, individual pumps were removed from service or operated at lower rates
due to various maintenance issues.
Without accounting for reservoir evaporative losses, by the end of March 2008
approximately 8,780 acre-feet of Dan River water had been added to Belews Lake both from
the Dan River pumping and from coincident, combined tributary inflows (Figure 9). This
represented approximately 74% of the volume required to achieve full pond elevation at 221
in (725 ft) msl, relative to the lake level at the onset of pumping. Typical winter -spring
tributary inflows in the Belews Creek drainage, attributable to the return of near-normal
precipitation totals for the months of February and March 2008 (NOAA 2008b, 2008c,
2008d), served to more than negate evaporative and consumptive use losses, and undoubtedly
increased the rate of filling the reservoir.
Thermal and DO Profiles
Water quality impacts of pumping operations at the time of Dan River supplemental pumping
during 2002 — 2003 were localized to the immediate vicinity of the inflow area. Cooler Dan
River water, upon entering Belews Lake quickly disperses and mixes both laterally and
vertically, as is indicated by the limited spatial dimensions of the higher -turbidity inflow
7

plume at the inflow point. While in 2008 water quality assessments were not made in the
immediate vicinity of the discharge, lake -wide water quality measurements, coupled with
observations of the inflow zone (Figure 6), confirmed similar results.
Vertical temperature and DO profiles measured at the forebay (Figure 10), and elsewhere in
the lower portions of the reservoir, confirmed the relatively minor thermal effect of inflowing
waters. February 2008 temperatures were generally within 1 °C of the winter average for
the post -1996 period, and were about 2 °C warmer than minimal temperatures measured
during pumping operations in 2003, a period when the lake was also influenced by unusually
heavy precipitation and stream inflows. Dan River inflows appeared to provide cooling for
the upper water column relative to the multiple year -averaged thermal profile. Forebay DO
concentrations during February 2008 were well in excess of applicable water quality
standards and were similar to maximum DO concentrations observed for non -pumping years
in the 1996 — 2007 interval.
Water Clarity and Suspended Solids
Lake -wide, assessment of water clarity and suspended material yielded results typical of
historical water quality monitoring data. Belews Lake has been classified as an oligothrophic
waterbody (Weiss and Kuenzler 1976). Typically, the downlake area (represented by
Locations 416.0, 418.0, and 410.0) is noted for water clarity due to very low concentrations
of suspended solids and limited algal biomass. In contrast, water clarity and suspended
solids concentrations at the uplake region (Location 405.0) are substantially impacted by
tributary inflows following heavy precipitation events. The mid -lake locations (419.2 and
419.3) represent a transition zone and are typically representative of a water quality gradient
between the downlake and uplake regions.
In the 2003 evaluation of the effects of pumping on Belews Lake water quality, it was
established that surface samples (as opposed to bottom samples) were most useful in
discerning potential changes in water quality parameters attributable to pumping activities.
Bottom samples, particularly at uplake and midlake transition zones, can introduce
substantial additional temporal variability, depending upon meteorological trends. Based on
this earlier finding and after cursory examination of 2008 bottom sample data, only surface
sample data were utilized in the data analysis.
8

Surface turbidity measurements collected in February and March 2008 at all regions of
Belews Lake (downlake, midlake and uplake) were within the range of values typically
encountered (Figures 11 — 13). Downlake and Location 419.3 (midlake) Secchi disk
transparency decreased marginally relative to long-term averages (Figures 14 and 15);
however, reduced winter 2008 measurements appeared to constitute part of a decreasing
trend observed since 2006. Secchi disk transparency in the shallower midlake and uplake
locations (419.2 and 405, respectively) was low compared with other regions of the lake,
similar to previously collected data (Figures 15 and 16). Belews Lake surface total
suspended solids concentrations during February and March 2008 were generally similar to
historical averages (Figures 17 — 19). Higher and considerably variable uplake suspended
solids concentrations, as was true for turbidity, are reflective of impacts from tributary inputs.
Nutrients and Chlorophyll a
Belews Lake forebay nutrient and chlorophyll a concentrations showed no discernable
effects attributable to Dan River inflows (Figure 20). Concentrations of total phosphorus and
nitrogen have remained low, indicative of a relatively low -productivity system (Duke Energy
2006). While winter 2008 nitrogen and chlorophyll a concentrations increased slightly with
respect to' previous winters, the significance is questionable given historical variability.
Water .quality impairment stemming from nutrient addition was not expected from the
pumping operations due to the relatively low nutrient concentrations commonly observed in
this reach of the Dan River (Duke Energy 2007).
Specific Conductance, pH, and Dissolved Minerals
Forebay pH and specific conductance measured during 2008 Dan River pumping were
similar to recent years (Figure 21). Temporal trending indicated, however, marginal
increases in both parameters over the last 117year period. Specific conductance has trended
upward from approximately 80 µ&cm to range between 100 and 110 µS/cm in the most
recent samplings. Forebay surface pH has likewise trended upward, from an average of
about 7.2 units to an average of about 7.9 units. Conductance and pH increases over time
appear linked to increasing concentrations of dissolved minerals, due to the combined effects
of inflow source contributions, coupled with constituent concentration due to evaporative
losses. Examination of the increases in these parameters is consistent with like -timed
increases in major anions (lower Figure 21) and cations (Figure 22), with the exception of
sulfates, which in recent years have remained at relatively constant concentrations in Belews
4

Lake. Evaporation -induced concentration of the various dissolved minerals in the water
column is further evidenced by the higher rates of concentration increases observed during
drought periods (i.e., 2000 — 2002, and 2007). Sulfate had been elevated in Belews Lake
well above natural background concentrations in the earlier years of BCSS operation, but had
trended downward substantially through much of the 1980s and 1990s (Duke Energy 2006).
In recent years, reductions towards expected background concentrations appear to have been
counterbalanced by sulfate concentration taking place due to evaporation. The resulting
reduced fraction of sulfate in the cation -anion equilibrium over time would lead to a
compensated increase in bicarbonate concentrations, thereby leading to the observed
increasing trend in pH.
Conclusions
Prior investigation following the 2002 — 2003 Dan River pumping had concluded that water
quality impacts were: 1) limited primarily to the immediate vicinity of the pump outlets in
the lake; 2) of transient duration (i.e., days as opposed to weeks); and 3) insignificant when
compared to effects of the 1998 — 2002 drought or seasonal storm runoff -related events.
Analysis of selected water quality spatial and temporal trends in this follow-up investigation
likewise supports those conclusions. Minor long-term trends noted in several Belews Lake
water quality parameters, i.e., specific conductance, dissolved minerals, and pH appear to be
primarily in response to a gradual concentration of soluble constituents in the reservoir,
attributable to low inflow and outflow rates. Increases in constituent concentrations tend to
be greater during drought years, but do not appear responsive in any significant way to either
episode of supplemental Dan River pumping.
Literature Cited
American Public Health Association (APHA); American Water Works Association
(AWWA); Water Environment Federation. 1998. Standard methods for the
examination of water and wastewater. 201h Edition. APHA, Washington, DC.
Duke Energy. 2006. Assessment of balanced and indigenous populations in Belews Lake for
Belews Creek Steam Station: NPDES No. NC0024406. Duke Energy Corporate
EHS Services. Huntersville, NC.
Duke Energy. 2007. Belews Creek Steam Station: 2006 Dan River summary. Duke Energy
Corporate EHS Services. Huntersville, NC.
10

Finley, KA. 2003. Water quality impacts of pumping Dan River water to augment Belews .
Lake level, winter 2002 — 2003. Duke Power Fossil -Hydro Environmental Health &
Safety. Huntersville, NC.
National Geographic Holdings, Inc. 2001. North Carolina Seamless USGS Topographic
Maps on CD-ROM. National Geographic Maps. San Francisco, CA.
National Oceanic and Atmospheric Administration. 2008a. National Climatic Data Center,
2007 local climatological data. Annual summary with comparative data —
Greensboro, North Carolina (KSGO).
. 2008b. National Climatic Data Center, Data for Greensboro, NC. January
2008. local climatological data.
. 2008c. National Climatic Data Center, Data for Greensboro, NC. February
2008 local climatological data.
. 2008d. National Climatic Data Center, Data for Greensboro, NC. March 2008
local climatological data.
United States Environmental Protection Agency (USEPA). 1983. Methods for the chemical
analysis of water and wastes. Environmental Monitoring and Support Lab, Office of
Research and Development. Cincinnati, OH.
United States Geological Survey (USGS). 2008a. Water -resources data for the United States
water year 2007. (accessed 6/4/2008). Web address:
http://wdr.water.usgs og v/wy2007/searcli.jsp.
. 2008b. Water resources data. National Water Information web site: USGS
water data for North Carolina. (accessed 5/29/2008). Web address:
hitp://waterdata.usgs.gov/ne/nwis/
Weiss, CM; Kuenzler, EJ. 1976. The trophic state of North Carolina lakes. Department of
Environmental Sciences and Engineering, School of Public Health, University of
North Carolina at Chapel Hill. Report No. 119.
11

Table 1. Analytical methods used to characterize water quality parameters for the winter
2008 Belews,Lake monitoring program.
Parameter
Method (EPA/APHA)a
Preservation
Limit
Alkalinity, Total
Total inflection point titration
< 6 °C
0.1 meq/L
EPA 310.1
CaCO3
Aluminum
Atomic emission / ICP
0.5% HNO3
0.05 mg/L
Arsenic, Total
ICP mass spectrometry
0.5% HNO3
2.0 pg/L
Recoverable
EPA 200.8
Cadmium, Total
ICP mass spectrometry
0.5% HNO3
0.5 pg/L
Recoverable
EPA 200.8
Calcium
Atomic emission / ICP
0.5% HNO3
0.03 mg/L
EPA 200.7
Chloride
Colorimetric
< 6 °C
1.0 mg/L
APHA 4500 -CI -E
Ion chromatographyb
< 6 °C
0.1 mg/L
Conductance, Specific
Temperature -compensated
in situ
0.1 pmho/cm`
nickel electrode
APHA 2510. B
Copper, Dissolved
ICP mass spectrometry
0.5% HNO3
2.0 pg/L
EPA 200.8
Copper, Total
ICP mass spectrometry_
0.5% HNO3
2.0 pg/L
Recoverable
EPA 200.8
Iron
Atomic emission / ICP
0.5% HNO3
0.01 mg/L
EPA 200.7
Lead, Total
ICP mass spectrometry
0.5% HNO3
2.0 pg/L
Recoverable
EPA 200.8
Magnesium
Atomic emission / ICP
0.5% HNO3
0.03 mg/L
EPA 200.7 .
Manganese, Total
ICP. mass spectrometry
0.5% HNO3
1.0 pg/L
Recoverable
EPA 200.8
Nitrogen, Ammonia
EPA 350.1 Rev. 2
<6 °C;
0.02 mg/L
0.5% H2SO4
Nitrogen,
Nitrite+Nitrate-N
Colorimetric / flow injection
< 6 °C;
0.02 mg/L
EPA 353.2 Rev. 2
0.5% H2SO4
Nitrogen, Total
EPA 351.2 rev. 2
< 6 °C;
0.1 mg/L
Kjeldahl
0.5% H2SO4
Oxygen, Dissolved
Temperature -compensated
in situ
0.01 mg/L°
polarographic cell
APHA 4500-0 G
a References: USEPA 1983 or APHA et al. 1998.
b Applies to November
2007 analyses only.
instrument sensitivity
furnished in lieu of laboratory reporting
limit.
12

Table 1. (Continued).
Parameter Method (EPA/APHA)
Preservation
Reporting
Limit
pH
Temperature -compensated
in situ
0.01 unit'
glass electrode
APHA 4500-H+ B
Phosphorus,
Colorimetric / flow injection
< 6 °C
0.005 mg/L
Orthophosphate
EPA 365.1 Rev. 2
Phosphorus, Total
Colorimetric / flow injection
< 6 °C
0.005 mg/L
EPA 365.1 Rev. 2
Potassium
Atomic emission / ICP
0.5% HNO3
0.25 mg/L
EPA 200.7
Selenium, Total
ICP mass spectrometry
0.5% HNO3
2.0 pg/L
Recoverable
EPA 200.8
Silica -Si
APHA 4500-SiO2-E
< 6 °C
0.5 mg/L
Sodium
Atomic emission/ICP
0.5% HNO3
0.1 mg/L
EPA 200.7
Solids, Total
Gravimetric, dried at 103-105 °C
< 6 °C
20 mg/L
EPA 160.3
Solids, Total
Gravimetric, dried at 103-105 °C
< 6 °C
1.0 mg/L
Suspended
EPA 160.2
Sulfate
Ion chromatography
< 6 °C
0.1 mg/L
EPA 300.0
Temperature
NTC thermistor
in situ
0.01 °Cc
APHA 2550 B
Turbidity
Nephelometric
< 6 °C
0.4 NTU
EPA 180.1
Zinc, Total
ICP mass spectrometry
0.5% HNO3
1.0 pg/L
Recoverable
EPA 200.8
13

1 75..................................:...................................................................
�Normal Annual Precipitaion (109.6 cm)
150
125
E
U
100
O
(6
75
N
CL
50
25
0 ' TI
0 0 0 0 6i rn W 0 0 rn 0 0 O 0 O 0 0 0
M rn rn rn rn M M M M M 0 0 0 0 0 0 0 0
N N N N N N N N
Figure 1. Annual precipitation totals for Greensboro, NC, during 1990 — 2007 compared
to the 30 -year annual normal calculated from the period 1971 — 2000.
30
25
f 20
5
0
8
M
Figure 2
n
Monthly precipitation totals for Greensboro, NC, 2000 — March 2008. (T =
Trace).
14

221
-------------------------- ----...........................••-•=--=---•-------••-
725
724
MiSsing Data---•------
221
723
722
220
:------------- ••---•--- ------------.............
w
m
721
E
o'
v
220
------------=---- --------•--................---�--•-•--••---••--•--•------------720�
C
O
�
j
719 y
. ,
W219
---•--------------
'----------------------------------- ..:. ------------ . ----
718
y
717
219
-------••-----•--------
------------ ;------------ =............ %------------- I•----------
716
218
715
i.
2001
2002 2003 2004 2005 2006 2007 2008
Date
Figure 3. Belews Lake surface elevations, 2001 — winter 2008. Periods of Dan River
supplemental pumping are highlighted in red.
Figure 4. Footprint of Dan River pumps (arrow) during January — March 2008.
15

Figure 5. Location of screened floating pump intakes (arrow) in the Dan River.
Figure 6. Location of pump outlets in the vicinity of the Belews Lake spillway.
16

Figure 7. Belews Lake water quality monitoring locations during 1997 — 2008.
17

100
c - . e.. .W. + . W �- W -... ..
2 5.95 m3/s (210 cfs) flow trigger point for pumping rate reductions
>,-------------------------------------------------------------------------------------------------
-------------------------•----------------------------------------.._.........--------.......----
1 '
1/22/2008 2/5/2008 2/19/2008 3/4/2008 3/18/2008 4/1/2008
Figure 8. Dan River daily minimum flows near BCSS, estimated from measured
discharge at the USGS Wentworth, NC station (02071000).
10,000••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••..............................
Belews Lake full pond volume = 279,000 acre -ft
9,000-•••••••••••••••••--••••...•••••-•••-••.......••••••••••••••••• ...............................
8,000 T --......----••-•.............•---.............-------------------------------- --------
7,000 -----------------
6,000 ---•--------------------------------------------•-----•----
5,000...........................................................
U
(0
4,000--------------------------------------------------------------------------•-----------------
3,000- ----------------------------- YC -----------------------------------------------------------------
2,000
---------------------------yr....----.---------.-.--------------------------------------------
2,000 t------------------ ---------------------------------------------------------------------------
1,000 ------------- f...----------...........----------------•---------------------------------------
Oy-
1 /22/08 2/5/08 2/19/08 3/4/08 3/18/08 4/11/08
Date
Figure 9. Cumulative volume of water pumped from the Dan River, plus tributary
inflows, minus evaporation and consumptive use during January — March
2008.
18

Temperature (°C)
0 2 4 6 8 10 12 14 16 18 20
DO (mg/L)
0 2 4 6 8 10 . 12 14 16 18 20
0
5 ---........---- ••--
10 ------- _-------- _._.____r_______r__.. -------- ,--------
r ........
r.._..__,_._.__.�
:
15 ----------------
20 ------- -------- ------- B -------- ------------------------
Q.
0 25 -•-- ----- ?...... j; ---- ....
30 ---• ---- --- -- N -� ... -"- ................ .....
35 ................ _........ .....O ----- ---- ...._ .....
40 ---------------- -------- .............
Figure 10. Thermal and DO vertical profiles at Belews Lake forebay (Loc 416.0). Mean
(solid blue) and extreme (dashed blue) winter values during 1997 — 2008,
exclusive of pumping periods (labeled years), are depicted.
WE
0
5
..... ---- ----
10
,---•---.,.
r......_
...................
...r __.'ter._..... ........
.....................
...
20
....... ,--------
---•----'--------`-•-
----------•'
.......:....... ........:
t
�
.
CL
0
25
---------------
30
---- ----
---
•-.-
- -
- O
---- .... ....
c4
35.............................:eu
- ------
-
---- ---- ----
.N
40
---------------
---
-•---
..1.
.
""
....
.... ...............
DO (mg/L)
0 2 4 6 8 10 . 12 14 16 18 20
0
5 ---........---- ••--
10 ------- _-------- _._.____r_______r__.. -------- ,--------
r ........
r.._..__,_._.__.�
:
15 ----------------
20 ------- -------- ------- B -------- ------------------------
Q.
0 25 -•-- ----- ?...... j; ---- ....
30 ---• ---- --- -- N -� ... -"- ................ .....
35 ................ _........ .....O ----- ---- ...._ .....
40 ---------------- -------- .............
Figure 10. Thermal and DO vertical profiles at Belews Lake forebay (Loc 416.0). Mean
(solid blue) and extreme (dashed blue) winter values during 1997 — 2008,
exclusive of pumping periods (labeled years), are depicted.
WE

10 - ------------------ ' -- ------------------
O
8
7
0
�- 5
-4
3
2 .............. N. ................ ........... .... ....................................
1
r- I- CO CO CD M a a M M M q- q- M M CO CO I- t- M M
M M M M M M CD CD CD 0 a a 0 o
O
CD 0 CD 0 0 CD C� CD a C� C�
.6 IL� � �� L� � � �n� � � .6���� � .6 .6 �n� .6�
:� � /p m /p � m � m � �� U- ~ � U- � U- � /p � U- � /p ~
10 ' ---'-----------------------------------------------
9
8
7
0
+' 5
-4
3
2
1
M M M M M 0 0 0 CD 0 CD CD 0 a 0 C3 0 CD 0 CD CD 0 0 0 0 0
O
10 - --- -------' ' --~ ---------------------------------------
9
-----'- --'-'-
O
8
7
O
5
-- 4
2
1 _ Oil
0 W wAINIIIIIII 11 11 IM, Ilion Ii
Fisuell' Dovvulake surface (0.3 n) turbidity during 1997 - vvbdor 2008.
Measurements coincident with Dan River supplemental pumping are depicted
by dark bars.
20
°

10 -----------------------------------------------------•-----••-----------------------------------------------
9-----------------------------------------------------------------------------------------------419:3
-----------------------------------------------------------------------------------------------------------
7 ------------------------------- -
6--------------------------•---......----------------........---•-•------------------------------------------
-
H5------------------------------------------------------------------------- ----- i,---------------------
z
4---------•-------------------------•-•-------------------------------*--------------------------.....
3 ...--••-------------------------•--... ....................................... „ ......................
2
1
I� 1� ti 00 00 O O O O N N M CO It to LO O (O r— t` O 00
O O O O O O O O O O O O O O O O O O O O O O O O O
-c� d -1& m .fl 07 -6 m C m -c� O ..O aT .!J 6) .O t>) .O �-
N
U- Q Q U- 0 U- Q U- Q U- Q Q u. Q U- Q 11 Q U- Q U -
Figure 12. Midlake surface (0.3 m) turbidity during 1997 — winter 2008. Measurements
made coincident with Dan River supplemental pumping are depicted by dark
bars.
70 ----- --•---------------------------------------------------------•--•----•---------------------------
405.0
60-----------------------------------------------•--------------•
.
50
„gat.
X40'---------••.................•--.....................................•---....................
H
z30--------------------------
20 •------------- u
10 . -- `
mri 171-1 F TI
I� ti a0 00 O O O O �--• N N 0 M V CD 0 0 0 00
M M O O O O O O O O O O O O O O O O O O
.fl C tT fs -6 Q .n iT IT A 6) C 67 .6 0n A fT -6 aT .O 6) Q
u -5 Q QU- cn U- Q u.. Q U- Q Q U- Q U- Q U- Q L- Q U
Figure 13. Uplake surface (0.3 m) turbidity during 1997 — winter 2008. Measurements
made coincident with Dan River supplemental pumping are depicted by dark
bars.
21

0
1
2
'3
a)
(D
E
5
6
7
CO CO O O O O — — N' N
Vto (0 O 1- � 0 0
OO O (A O O O O O O OO O O
@ 7 N 0 0 7 0 7 0 7 N N 7 0 7 0 7 W 7 N 7 CD W
Q U- W U- Q LL Q U- Q-5 L Q ti Q ti Q u. Q U- Q U-
................. —........................................................................................
416..0
0
1
2
E23
a)
(D
5
6
7
00
00 CO O 0) O O — N N CO CO M M V'V• V) to (0 CO I, r- CO 00
C,) 9 T Cn O O O O O O p O O O O O O O O O O O O O
rn n a .0 CM-0rn�6 rn c- m ami M aM 0) 0) m am
Ai `
Z3 7 N N N 7 N 7 y = M Ncc
2¢ LL CO LL Q LL Q, u. Q� u. 2 Q LL Q U- Q u. Q u. Q u. 2
----------------------- ------41.0..0.
Figure 14. Downlake Secchi depth during 1997 — winter 2008. Measurements made
coincident with Dan River supplemental pumping are depicted by dark bars.
22

�� � ����;0 tm � tm ����m � �M M =� a) m
M < LLm�< < U- < <u- < U- < U- < U- < U- 2
O
1 -- --'
2 -- --'.......--'t--'.......=—'..e=....------------
------------------------------------------------------'
� Ek -----------------------------------------'�------------'
5 ------------------------------------------------------'
O------------'---------------'�---'----------------------
|
7 ��^� � K�~u���
----------------_------------------------------'��'o��'
Figure 15' Midluko 8eoobi depth during 1997 — winter 2008' Measurements made
coincident with Dan River supplemental pumping are depicted 6vdark bars.
� 9 9 q �� 0 � Z
(D CD � � � � m
�<�m�< <�<� UT <:3 UT <:3 �< LL < U- -a
O
1 —'M ................. E..... --'M--'W--'--'°=="--'����
2 ------------_----------------------------------_------'
-----------------------------------------------'-------
�4 ----'--------------------------------------------------
5 ------------------------------------------------------'
0-------------'`----------------------------------'------'
f 7 ----------_-------�------------------------_-----'40.5..0'
Figure 16. Uplake 0coohi depth during 1997 — winter 2008' Measurements made
coincident with Dan River supplemental pumping are depicted by dark bars.
23

30
---------------
--------------------------------------------------------------------------------------------
25
----------------------------------------------------------------------------------------------416.0-.
20-----------------------------------
.----------------------------------------------------------------
J
418.0
25
--------------------------------------------------------•-•--....----•----------------------------------....
'rnM 5
-•----------------------------------------------------------------------------------------------------------
E
20
10
------------------------------------------------------------------------------------------------------------
__
-----------•--•--•--•---......---•--•---............................--------------...
5
....................................................................................•--------------•-•.•---•
J
�.
0
M LO COO
P- I`
r M M
O
M
O
O �- �-- N N M M M M It
It 0
0 0 0 r-� 00 00
m M M M
M M
M M M
O
O
O
O O O O O O CO O O O
O O
O O O O O O O
-[,A Q L].
�6 C
CT - m
�6
Q
d
ZT .6 6).6 m C .CZ - &A
6) .fl
&.fl O -6 6) -6-
2 Q LL W
LL -
Q 2 Q
LL
W
LL
Q LL Q LL Q LL 2 Q LL
Q LL
Q LL Q LL Q LL:E
30
-------------------------------------------•---.........................----------•--------------------•----
418.0
25
--------------------------------------------------------•-•--....----•----------------------------------....
20
--------------------
__
-----------•--•--•--•---......---•--•---............................--------------...
J
�.
5
,
10
.
....................................•-----...-•----..................................
5
------------------------------------------------------------------------------------•
0
c^
e
���r—
r r ..
��II,
r
h
ti
tiM
W
M
M
O
O
r
N
N
M
M
CO
CO
V'
'd' LO
LO
'CO
CO
I- h CO 00
W
m
O
M
M
M
M
O
O O
O
O
O
O
O
O
O
O
O O
O
O
O
O O O O
a)
Ccu
@
CA
.6Q
.6C
O
.fl
cu
cuN
O
.fl
..fl
O
.0
m
5
@
(U
LL
7
'--3
7
5
Q
2
7
Q
CU
LL
N
0
N
LL
= N
Q LL
=
7
Q
fU
LL
7
Q
L6
')
N
LL
2
7
Q
LL
=
7 N
Q LL
7
Q
N
LL
7
Q
N = 5
N
LL Q LL.2
30-----------------------------------------------------------------------------------------------------------
25 T ------------------------------------------------------•-----------•--•--•-----........--------410.0.
20--------------------------------------------------------------=---------------------------------------------
J
5 .................. -----------------------------••---•---.......••---------------------------------•....
10 --------------- P ........ ----------------------------------.........------•---.....------------------•
�
MA
0 e ter77M ".
r- r- n M 00 O CA O O
O O) (A O (A O M O O O O O O O O O O O O O O O O O O O O
it .6 ZT � ZT � O C � �• m .Q to .fl ZT .0 tT .Q O O �
LL Q Q LL fn LL Q LL Q LL Q M LL Q LL Q LL Q LL Q LL Q LL a
Figure 17. Downlake surface (0.3 m) total suspended solids concentrations during 1997 —
winter 2008. Measurements made coincident with Dan River supplemental
pumping are depicted by dark bars.
24

30
25 4 19.3
---------------------------------------------------------------------------------------------- -
20------------------------------------------------------------------------------------------------------------
J
��M 5-----------------------------------------------------------------------------------------------------------•
E
10 ------------------------------------------------------------------------------------------------------------
5------------------------------------------------------------------------------------------------------------
r ay � �e as as _icy _, a€ ¢ate n,: a — _ �� t ,xx i __ L;r E v
OO O O r ti r M O O O O O r N N 'M M V' 'd• to O W 0 I- r W M
O M M M O O O O O M M O O O O O O O O O O O O O O O O O O
O Q Q C m O d O Q m O C O m .Q m O O .fl
:EQ U- U) U-� 7 7 N 7 N 7 l.. fn 7 f 5 7 N 7 N 7 N 7 7 N
Q � Q lLL. Q Ll-. Q L.L Q � Q LL Q LL Q LL Q LL Q LZa
Figure 18. Midlake surface (0.3 m) total suspended solids concentrations during 1997 —
winter 2008. Measurements made coincident with Dan River supplemental
pumping are depicted by dark bars.
30 -----------
405...
-------------------------------
20
J
"615
E
10
5
C�]
O O C4 C4 f- 1� r- W W M M O O � r N N M M V• 1q,0 O 0 0 f- 1- W W
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
� 6) -C� N -CS 7 6)� 7 N N N 7 N 7 N 7 fC6 m N 7) N 7
QLL cn LL -5 Q Q LL CO U- Q LL Q U- Q Q u. Q u. Q U- Q LL Q LL a
Figure 19. Uplake surface (0.3 m) total suspended solids concentrations during 1997 —
winter 2008. Measurements made coincident with Dan River supplemental
pumping are depicted by dark bars.
25

0.05 ------------------ •..................................... .........._...----•---..........--.-
rn0.04-•------------------------=------------------•.........................; : .
w �0
i0.03 ------------------ --------- •-----. •---- ---- --
0
C .0
0 0.02 - ----------------- ------ ...... ..... ------- ... ........ ---- ............
a
0.01 0- :b o .0----- --- -- --©-- --
0 0 0 :0 0 0 0 :�
0.00
1.0---------------------------.....
0.9 ----- -•--- -•-- -----
0.8 ----- .................. ..... - -•--- -•-- -----
C0.6--------------------------- --•----------------------------------------
0 0.5------------------------------- ---- ---- ------ .............. o ---- -------- '0--
2 0 .
z0.4 © - �Q Q A .... :-0 ------ ---- --- ------ Q--'
: 0
0.3 ® o o
�0 0.2 :_.._____•_____________ Q...t ......:_____4_.:9D..___J________:________:________•__..._.
0.0
10 -r ------ ---- ---- ---- ---- ----- ----- - ------ ------ ----- ----- ..
9.---- ---- ----- •---- ------
0
J8 . ..............................................
6------- -------------------------- ....... ----------------- ........ -----....................
>, 5 -------- ---_. ..... ..... .......................................: R .
0 4-------------------------------- ---- .............. ........... . .0 ----- ----- :0
....... '
0
p .O
U 2 .................
:. ---•:-0------ :.........-----•----- 0 ---- : -----..J_....-- 'Q L
0
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
Figure 20. Forebay surface total phosphorus, total nitrogen, and chlorophyll a
concentrations during 1998 — winter 2008. Measurements made coincident
with Dan River supplemental pumping are depicted by dark symbols.
26

E160 ................. •--------,--------•-•------•-----------------•----•-----
E140 -------- -------------- -------- ----- ----- ------
U120 ------------------ ;------- :------- -------- ;-------------------------- -------- ...... + .
100..................a o..:_ -0 o �iP 0 0---' b 0-- o 0
80 ® -O-Q- --- o----- ---- -0---- ------------------ ---- ---- ----- ----- --
CU40 .................. ..... ...... ....• ...... ........ ----- .... ----- -----.
U
20----- ------- -------------------------- ------ ---------------- •-• --•-- .....- --
0- 0
U)
1 0..........................................
9 . ---- ---- ------------------
8 - -------- .............................. o--: .......--------------- ........ ; ......
0 0 0 0 �b 0 0 0
•--------=- . 0-.'.0.-,0 ,.................. ......-- ----- --
:0
6 ------ ---- ---- ---- ---- ---- ---- --- --------------------
5-
10 ------------510.............................................--------- ---- ---- ------ .........
9----- ----- ----- ---- ---- ---- --•-...........................................
8 0. _. _.0 ;!� ... .... Q ... ... o. ��.
,0
•0
5 0 ;0 ;0 ;0
00 0---------------.......................... 0 4 -----..............................................
3
1.............................................................- ---- ----------;-....---;
0
14...-- -- ---- ----- .......
12 ----- ----• ---_. ..... o...._ ..... ..... .--- ---- .... ..... --
10 0 -00--;-- o ;o -- ---;o ------ a o ;�_-----------a------0................o
o �0 ;o
8 Q 0 ;------. .a -;Q ------;0 ...........
6 ----------------- ----- ---- ---- ---- ---- ---- ---- ---- .---•-
:3 4 --- ---- ------------------ ---- -
0
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
Figure 21. Forebay surface specific conductance, pH, chloride, and sulfate concentrations
during 1997 — winter 2008. Measurements made coincident with Dan River
supplemental pumping are depicted by dark symbols.
27

N
00
Cr
CD ua w
CD
CD
CD
N �
O O
yCD
H • 7 �]Q
C W
arC
CCD O
• O V
O
CD
� n
d CD
A�
O
O
�s (n
Potassium (mg/L) Sodium (mg/L) Magnesium (mg/L)
N W ? M O" N CO -A• M O V O (O O O N CO ?
Calcium (mg/L)
CP O ' N W -P Ul O V W (O O
(n
w
CD
N
O
O
0
N
O
O
N
O
ro
N
N
O
O
W
N
O
CD
N
O
O
CnN
C)
O
rn
N
O
O
V
N
O
O
CO
.......
.....
... .._
:0
.... ...
...
�...._ .._
0.
O;
......:............Q
.
..............
:Q
ID
0
0
O
O
.... .............
.............
.. --
O
.... ---... _�. ...
9
0:
:0
o:
.....
d
o:
O;
.. ....•...f..7..5.. �..�..f..7..i
0
8
O
0:
: 0 ;
:o
.p.
o:
Cr.
. .

APPENDIX
NCDENR authorization to operate temporary cooling water intake structure
29

D410 POINT SOURCE Fax: [phone]
January 15, 2008
(d E. T.ewis
>,Encrgy Company
ill`Hydro Generation Dept.
Box 1006
latae, North Carolina 28201-1006
Jan 16 2008 8:55 P.02
Michael F. Easily, Governor
State of North Carolina
William ia, Ross, Jr., Secretary
Department of Environment and Natural Resources
Coleen H. Sullins, Direotor
Division of Water Quality
Subject: Authorization to Operate
Temporary Cooling Water Intake Structure
NPDES Permit NCO024406
Dake Power/ Belews Creek Steam Station
Stopes County
Lewis:
Ietter authorizes the operation of a temporary cooling water intake structure at the existing steam, electric
The intake structure will ptunp water from the Dau. Viver to Belews Lake, which provides condenser
ag water for the subject facility- In a typical year, Beltws Lake falls in the spring to 724.5 feet iml, then loses
feet over time summer and fall. Due to exceptional drought conditions, projections for 2008 indicate Belews
may fall below the minimum spring lake level necessary .for continued intake pump operation through the
ler period (i.e. 720 feet msl)- The plan proposes to pump take levels to a minimum of 720 feet uts1, up to a
amuut of 724.5 feet msl, by end of March 2008,
; pumping plan has been proposed to ensure tmimtterrupted power production at this base load facility, wbile
gating effects on the aquatic community and downstream users. This plan was reviewed in 2002 (when it was
:'requested) by staff of the NC Division of Water Quality (DWQ), NC Division of Water Resources (DWR),
Wildlife Resources Commission (WRC), NC Division of Land Resources (DLR), and the US Army Corp of
iueers. The cturent proposal has been reviewed by staff of tht NC Division -of Water Quality (DWQ), and NC
ision of Water Resources (DWR), It is our understanding that Duke Energy has discussed the proposed
porary pumping plan with downstream municipalities with water intakes.
temporary pumping plaid is authorized to be irTtplemepted vri% tine following operational and design measures
hikaize biological impacts and downstream water supply concerns:
➢ Pumping is scheduled to begin in January 2008 and end in March 2008, which coincides with the
historical period- of maximum flow in the Dan .River, and avoids the April -May fish spawning period. If
water levels in Belews Lake are still below 720 feet m -,l after this period, Duke Power must request
authorization to continue temporary pumping beyond this date.
➢ Pumping will not lower the flow in Damm ]liver below 110 cfs, which is the Division of Water Resources
tat•get flow recommendation for this site. River flow at the pumping location will be estimated prior to
each daily pumping event.
➢ The mllinimura pumping rate will be 10 cfs (6 MGD), and the maximum pampmg rate will be 100 cfs (65
MGA).
A The Dan River intake primps will be positioned above the river bottom and have an approach velocity less
than or equa). to 0.5 feet/ second across screening with mesa openings of less than I Cm to minimize fish
entrainment and impingement-
)>
mpingement➢ The withdrawal location will be near the cotdiuence of the spillway channel below Belews Lake Dam and
. the Dau River. This is a scoured bottom area that does not provide suitable aquatic habitat.
➢ The facility will perform routine monthly lane monitoring during the period of pumping to assess
liunnological conditions in Belews Lake.
1617 MAIL SERVICE CENTER. RALEIGH, NORTH C,44olaNA 27699-1 61 7 - TaEPHONE 919-733-5083/FAX [phone]
VISIT US ON TI -IE WS;B AT http: //h2o,uiir.s-tote.nc.us/NPDkS

DWQ POINT SOURCE Fax:[phone] Jan 16 2008 8:55 P.03
P -a p2of2
Saijuary 14, 2008
T Z . additional fishery issue associated with this temporary pumping, the potential for transmittal of a -fish virus
(Ld Spring Vizemi.a of Carp Virus) ftom the Dam River to Belews Lake has been reviewed by the lead- fisheries
ble togist and declared mot to be an issue. There was no evidence that the pathogen survived in the system =d no
evi emat:- was found in their monitoring in 2004 that the virus tial affected any fish in the upper Roanoke! Dan
Fti�'pg system.
pj; me. note that this authorization does not affect the legal requirements To obtain other permits which may be
t ed by the Division of Water Quality, the Division of Land Resources, the Coastal Area'Management Act, or
atr; other :federal or local governmental permits.
If roa have any questions or weed additional information, please do not hesitate to contact Jiro. McKay of my staff
at. 919) 733-5083, extension 595.
$ia
Surface Water Protection Section Chid
Central :Files
NPDES Unit f=iles
Winston-Salem Regional Office — Surface Water Protection
NCDWR! Fred Tarver
T

DWQ POINT SOURCE
Pumping ]gates
Fax:[phone] Jan 16 2008 8:55
P. 04
adrawals will be variable based upon available river flow, and a flow measuring device will
i,ltstalled at the intake location. The Division of Water Resources target flow
ornend;adonfor the Dan River at this site is 110 cfs.. Pumping will not lower the in -stream
r rates to less than 110 cfs. Tktus, the iu-stream flow rate should be sufficient for "N?DES
barges and water withdrawals. The rninimum pumping late will be 10 - 20cfs, and the
imam pumping rate will be 100 cfs. The following is as outline of proposed pumping
Table 1- Proposed Pumping hates
River Flow
C fs
Pumpik. Rate
cfs
>210
100
200
90
194----...�.�80
180
70
170
60
160
50
150
40
140
30
130
20
120
10
110
0
Pum'piung Schedule
)ng is scheduled to begin in January 2008, and withdrawals will vary based on available:
flow as outlined in Table 1. At the maximum proposed pumping rate, 61 clays of
mous punipinb would be required to raise the lake level from 716 to 720 feet rusl. if the
level chops to 715 feet msl, then 101 days of continuous pumping would be required to
the lake level fro -Da 715 to 720 feet msl and 202 days would be necessary to rause the lake
to full pond (724.5 feet mal). However, puaxpirtg is unlikely to extend into late spring due
rw and aquatic constraints.