HomeMy WebLinkAbout20030147 Ver 2_Meeting Minutes_20080602
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Progress Energy
2008 Dissolved Oxygen Study
Tillery Hydro Daily Schedule
.512/08 Draft
Date Day Test Time Description
8/14/08 Thur n/a All Da Deploy data sondes and level loggers from Blewett Falls
8/15/08 Fri n/a All Day Deploy data sondes and level loggers from Blewett Falls
Setup diesel air compressors, air lines, and manifolds
8/16/08
Sat
T1 0700 Sat
until Trashgate min flow test for 24 hrs
0700 Sun Target Flow: 330 cfs
8/17/08
Sun T1 0700 Sun
until Trashgate min flow test for 24 hrs
(cont.)
0700 Mon Target Flow: 330 cfs
0000 - 0700 Maintain trashgate min flow at 330 cfs
T2 Start up Unit 2 - Economy Load (no air)
0700- 1000 Immediately load Unit 4 (with air) up to 15 MW
8/18/08 Mon Once Unit 4 is on-line, shut Unit 2 down and close trash ate
T3 1000 - 1500 Bring Unit 4 off-line and open trash ate to 330 cfs
1500 - 1900 Normal station peaking operations (run 3 or 4 units - no air)
T4 Close trash ate when units are operating
1900 - 2400 Trash ate min flow at 330 cfs
T5 0700 -1000 Unit 4 - 9 MW (air on)
T6 1000 - 1300 Unit 4 - 15 MW (maintain air on)
Unit 2 - Economy Load (with compressed air)
8/19/08 Tue T7 1300 - 1600 Unit 4 - 9 MW (air on)
Measure downstream flows lit
Unit 2 - Economy Load (no air)
T8 1600 - 1900 Unit 4 - 9 MW (air on)
Measure downstream flows lit
Check data sondes
8/20/08 Wed n/a 0700- 1600 Deploy large mixer in forebay at Unit 2
Deploy underwater bubblers stem at Unit 2
T9 0700 -0900 Unit 2 - Economy Load (no air)
8/21/08 Thur T10 0900 -1200 Unit 2 - Economy Load (compressed air
TI I 1200 -1500 Unit 2 - Economy Load bubble diffuser
T12 1500 -1800 Unit 2 - Economy Load surface mixer
T13 0700 -0900 Unit 2 - Economy Load no air)
T14 0900 -1200 Unit 2 - Economy Load bubble diffuser
8/22/08 Fri T15 1200 -1500 Unit 2 - Economy Load surface mixer and bubble diffuser
T16 1500 -1800 Unit 2 - Economy Load (compressed air, surface mixer and
bubble diffuser
1 of 2
Date Day Test Time Description
1800 Fri 24-hr period of no generation to get a baseline dataset on
8/23/08 Sat T17 until rate of DO change due to vegetation. Opportunity to
1800 Sat measure leakage during this test if necessary.
1800 Sat Trashgate flow test at 725 cfs to verify spill rating curve
8/24/08 Sun T18 until Measure flow below Hwy Bridge (truncate test when flow
1200 Sun measurement is completed)
T19 0500 -0700 Unit 2 - Economy Load (no air)
T20 0700 -1000 Unit 2 - Economy Load (bubble diffuser)
T21 1000 -1200 Unit 2 - Economy Load (bubble diffuser)
Unit 4 - 9 MW air on
8/25/08 Mon
T22 1200 -1500 Unit 2 - Economy Load (surface mixer and bubble diffuser)
Unit 4 - 9 MW air on)
Unit 2 - Economy Load (compressed air, surface mixer, and
T23 1500 -1800 bubble diffuser)
Unit 4 - 9 MW (air on)
T24 0600 -0900 Unit 4 - 9 MW air on)
Unit 2 - Economy Load (compressed air)
T25 0900 -1200 Unit 4 - 9 MW (air on)
Measure downstream flows lit
8/26/08 T T26 1200 -1400 No Generation
ue Unit 2 - Economy Load (compressed air, surface mixer, and
bubble diffuser)
T27 1400 -1800 Unit 3 - Economy Load (air on)
Unit 4 - 9 MW (air on)
Measure downstream flows lit
8/27/08 Wed Retest as Necessary
8/28/08 Thur Retest as Necessary
8/29/08 Fri Demobilize
2 of 2
Progress Energy
2008 Dissolved Oxygen Study
Blewett Falls Hydro Daily Schedule
5/2/08 Draft
Date Day Test Time Description
Install flashboards on spillway and cinder to make
Prior to Testing watertight
Raise and to normal elevation on flashboards
8/7/08 Thur n/a All Day Deploy data sondes in forebay (3 locations with 3 data
sondes deployed vertically per location
8/8/08 Fri n/a All Day Deploy data sondes and level loggers in downstream reach
Deploy pontoon boat with small mixers at Unit 2
TI 0000 -0300 Unit 2 at Economy Load no air
T2 0300 -0600 Unit 2 at Economy Load with small mixers operating)
T3 0600 -0900 Unit 2 at Economy Load (with small mixers and vacuum
breaker valves open)
Unit 2 at Economy Load (no air)
8/9/08 Sat T4 0900 -1200 If tailrace DO drops below 5.5 mg/l, startup small mixers
If tailrace DO drops below 4.5 m /l, open vacuum breakers
Run at least two units across the peak, per dispatch (no air)
When not peaking:
T5 1200 -2400 Unit 2 at Economy Load (no air)
If tailrace DO drops below 5.5 mg/l, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Unit 2 at Economy Load (no air)
T6 0000 -1200 If tailrace DO drops below 5.5 mg/l, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
8/10/08 Sun Run at least two units across the peak, per dispatch (no air)
When not peaking:
T7 1200 -2400 Unit 2 at Economy Load (no air)
If tailrace DO drops below 5.5 mg/l, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Unit 2 at Economy Load (no air)
T8 0000 -1200 If tailrace DO drops below 5.5 mg/1, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Run at least three units across the peak, per dispatch (no air)
8/11/08 Mon When not peaking:
T9 1200 -2400 Unit I at Economy Load (no air)
If tailrace DO drops below 4.5 mg/1, open vacuum breakers
Move pontoon boat to Unit 5 during afternoon
T10 0000 -0300 Unit 5 at Economy Load (no air)
8/12/08 Tue T11 0300 -0600 Unit 5 at Economy Load (with small mixers operating)
T12 0600 -0900 Unit 5 at Economy Load (with small mixers and vacuum
breaker valves open)
1 of 2
Date Day Test Time Description
Unit 5 at Economy Load (no air)
T13 0900 -1200 If tailrace DO drops below 5.5 mg/1, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Run at least three units across the peak, per dispatch
When not peaking: .
T14 1200 -2400 Unit 5 at Economy Load (no air)
If tailrace DO drops below 5.5 mg/l, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Unit 5 at Economy Load (no air)
T15 0000 -1200 If tailrace DO drops below 5.5 mg/l, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
8/13/08 Wed Run at least three units across the peak, per dispatch
When not peaking:
T16 1200 -2400 Unit 5 at Economy Load (no air)
If tailrace DO drops below 5.5 mg/1, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Unit 5 at Economy Load (no air)
T17 0000 -1200 If tailrace DO drops below 5.5 mg/1, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Run at least three units across the peak, per dispatch
8/14/08 Thur When not peaking:
Unit 5 at Economy Load (no air)
T18 1200 -2400 If tailrace DO drops below 5.5 mg/l, startup small mixers
If tailrace DO drops below 4.5 mg/l, open vacuum breakers
Retrieve foreba data sondes and re-deploy at Tiller
Measure the following flows in the immediate tailrace:
Unit 2 at Economy Load (no air)
Unit 2 at Economy Load (with air)
Unit 5 at Economy Load (no air)j
8/15/08 Fri T19 - T22 0700 - 1600 Unit 5 at Economy Load (with air)
Move pontoon boat to Tillery Hydro parking lot
Retrieve downstream data sondes and re-deploy a Tillery
Retrieve level loggers and re-deploy at Tiller
2 of 2
D
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Devine Tarbell & Associates, Inc.
G-hi.g E.K;.e-, xw.fi-, k
con Pro ress Ene
to.3 9 MY
Comprehensive DO Enhancement
Program at Tillery and Blewett Falls
Hydroelectric Plants
FERC Project No. 2206
Meeting with N.C. Division of Water Quality
Raleigh, North Carolina
June 2, 2008
D
ZT?A?
Q Progress Energy
Tillery and Blewett Falls DO Enhancement Program
Schedule
Aeration Studies
Taking Place
2004 1 2005 1 2006
Studies wQ Monitoring Comprehensive Compressed Air
initiated Report and Draft Tube Injection and
Prelhninary Vent Testing Surface Mixing
Turbine in Forebay
Venting Report
Prepared 2006 W
Q
Monitoring and
WQ Certification
Draft Tube Application
Venting Submittal
Summary Report lone 2007
Submitted April
2007 2007 WQ
Monitoring Report
Submitted )une
2006
2007 1 2008 1 2009
Additional
Testing of
Compressed Air
injection and
Surface Mixing
in Fonebay
Compressed Air
Diffusion In
August 2008
113
2010
Design and
Implementation
2011
Compliance with
DO Standards
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
' D " ?
?QTLA
&*3 Programs EneW
Tillery and Blewett Falls DO Enhancement Program
Objectives
• Designed to systematically evaluate DO enhancement technologies for
effectiveness, viability, operational impacts, and cost
• Taking into consideration capital costs, annual O&M, energy
reductions, and relative DO gain efficiency
• Systematic program involves field testing and engineering design:
- Draft tube venting ?ot _ 1
- Compressed air injection- !
- Surface mixing of forebay jo-2' r'
r
- Compressed air diffusion in forebay``?
• Overall goal is compliance with applicable NC DO water quality
standards by 2011
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D
*+*** TA
QS' Pmgrm Energy
Present Status of DO Enhancement Program
• 2006 Study (July-August testing)
- Completed intensive study of draft tube venting capability at both
Tillery and Blewett Falls
• 2007 Study (August testing)
- Surface forebay mixing at both Tillery and Blewett Falls
- Compressed air injection at Tillery
- Data summarization, analysis, results, and conclusions provided in
2007 Study Report (to be provided June 2008)
• Key results and findings will be shared today
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D T PW= EmW
Dissolved Oxygen Enhancement Study: 2004-2005
• Purpose
- Assess potential for direct draft tube venting at Tillery and Blewett Falls
- Use results to develop detailed strategy for 2006 DO testing program
• Methodologies
- Tillery Unit 2: 6-inch draft tube connection tested
- Tillery Unit 4: Tested without venting
- Tillery House Unit operation - approximately 24 hours
- Blewett Falls Units 5 & 6: Tested single 3-inch vent line off each draft tube
• Results
- Tillery: Unit 2 showed between 0.3 and 1.1 mg/l DO improvement
- Blewett Falls: Units 5 & 6 showed between 2 and 3 mg/l DO improvement (some spillway
leakage during testing period may have affected the results)
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
TA
CN Pro sy EneW
Dissolved Oxygen Enhancement Study: 2006
Purpose
- Comprehensive, systematic turbine venting program
Methodology
- Simultaneous DO testing at both hydro plants: July 24-28 and August 5-8
- Direct turbine draft tube venting airflow measurements were made
- Units were tested individually and in various combinations
- Continuous downstream water quality monitoring during testing period
Results -r
- Tillery Units 1-3: Turbine venting does not provide any substantial downstream DO improvement::
- Tillery Unit 4: Turbine venting provides excellent air uptake when generating below 10 MW with the j1
vent valve open. Downstream DO concentrations equaled or exceeded 5 mg/L.
- Blewett Falls Units 1-6: all units entrain substantial amounts of air and increase downstream DO by 1.5
mg/L. Units 4-6 are more effective than Units 1 - 3 due to different valve types and larger valve openings.
Power loss was estimated at 10 to 15% on Units 1 - 3 and 20 to 35% on Units 4 - 6.
- Downstream DO concentrations (below proposed compliance locations) heavily influe ced by diurnal
effects of algal photosynthesis and respiration.
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D ` -
***** TA
&'IS' P y
Dissolved Oxygen Enhancement Study: 2007
• Purpose
- Conduct turbine venting, compressed air injection, and forebay surface mixing
• Methodology
- Simultaneous DO testing at both hydro plants: August 4-15
- Units were tested individually and in various combinations
- Downstream water quality monitored continuously during testing period
• Tillery Hydro
- Turbine venting (atmospheric air entrainment) on Unit 4 (similar to 2006 study)
- Compressed air injection into draft tube on Units 1 & 2
- Compressed air injection into intake trash blowout system on Units 1 & 2
- Surface mixing in forebay at Unit 2
- Minimum flow test (24 hr test) using trash sluice gate
• Blewett Falls 120 C- s
24-hr testing of proposed minimum compliance flows with vacuum breaker vents closed vs. open
Surface mixing in forebay at Unit 5 with vacuum breaker vents closed vs. open
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D
TA
C Pmgnm EneW
Tillery Hydro Profile
• 77 MW / 14,900 cfs when operating at best efficiency
• Units 1,2&3
- Installed 1927
- Vertical, Francis type
- Turbine flow & generator output (at best efficiency and 70 ft head)
• Unit 1: 3,700 cfs (19 MW)
• Unit 2: 3,000 cfs (16 MW)
• Unit 3: 3,700 cfs (19 MW)
• Unit 4
- Installed 1960
- Vertical, fixed-propeller type
- Turbine flow & generator output: 4,500 cfs (23 MW) (at best efficiency and 70 ft
head)
• Typical startup sequence of unit operations
- Unit 2 first on-line, then Unit 4, Unit 3, and Unit 1
- Peaking and load-following capabilities
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D' Pmgrm EneW
TA ?.?
Tillery Hydro Profile - Cross-Sectional Schematic
Red box indicates approximate area where draft tube vent connection are located
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Progress Energy
Tillery and Blewett Falls Hydroelectric Plants
PfClt a Na -NORTH CARMM
CARQJ" POWER a L*W CMVAW
Comprehensive DO Enhancement Program Meeting
June 2, 2008
DTA PW= EneW
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_.... «.......Yw.. Intake Blowout
System
Approximate location
of draft tube vent valve
connections CAPKLJ" sSLAWCOWN"
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D TA Tillery Hydro
Pmgnm
Draft Tube Vent Unit 4 ? Energy
Unit 4 8-inch head cover
vacuum release inlet pipe used
during 2006 and 2007 testing
period
Actual testing location shown
is outside of the unit block
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D
Z A
Tillery Hydro
Draft Tube Vent Unit 4 (cont'd
Unit 4 8-inch head cover
vacuum release valve used
during 2006 and 2007
testing period
Photo is inside the wheel pit on
top of the wicket gates
? Progress Energy
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA Tillery Hydro Air Compressor ProgressEnefsv
1600 cubic feet per minute
diesel air compressor used at
Tillery Units I and 2 during
2007 testing period
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA Tillery Hydro Draft Tube Vents t^ Pg,?.Eegy
6-inch draft tube vent valve
used during 2005, 2006 and
2007 aeration testing
(typical of Units 1, 2 & 3)
Compressed air hoses
attached
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D TA Tillery and Blewett Falls Hydro k42 ????y
Small Surface Mixer
7-inch diameter KASCO mixer
4 of these mixers were installed
on the corners of the floating
platform (pontoon boat) during
2007 testing at Tillery and
Blewett Falls
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DT A Tillery Hydro Large Surface Mixer
100-inch impeller axial mixer
used during 2007 testing in front
of Tillery Unit 2 intake structure
WIPIRM
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D?.A Tillery Hydro Large Surface Mixer
Photo showing location of 100-
inch impeller (center of pontoon
boat) and 7-inch mixers located
on each corner
M
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTillery Hydro Large Surface Mixer Deployment of pontoon boat and
surface mixers in front of Tillery
Unit 2 intake structure
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D Pmgrm Energy
TA
Blewett Falls Hydro Profile
• 23 MW / 7,380 cfs when operating at best efficiency
• Powerhouse contains 6 turbine-generator units
- Each unit is driven by 2 turbines
- Each turbine is a double runner, single discharge, Francis type
• Units 1 through 6
- Installed 1912
- Horizontal, twin Francis type
- Turbine flow & generator output (at best efficiency and 47 ft head)
• Unit 1: 1,210 cfs (3.5 MW)
• Unit 2: 1,210 cfs (3.5 MW)
• Unit 3: 1,210 cfs (3.5 MW)
• Unit 4: 1,250 cfs (4.2 MW)
• Unit 5: 1,250 cfs (4.2 MW)
• Unit 6: 1,250 cfs (4.2 MW)
• Typical plant startup sequence of unit operations
- Block-loaded facility; no particular sequencing of units
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA k*2 Progress Energy
Blewett Falls Hydro Profile - Cross-Sectional Schematic
Red box and arrows indicate approximate location of vacuum breaker valves
S ? 0 S IS :•
SCALE M FEET
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
'D TA
C Progress Energy
Typical Section
Thru Powerhouse With
e o s » za Existing Equipment Upgrades
SCALE w seer
IDM=2z- "' Fpwe 2
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
Blewett Falls Hydro Draft Tube Vents
4-inch vacuum breaker gate
style valve used during 2006 and
2007 testing period
(typical of Units 4, S & 6; two
valves per unit)
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
Blewett Falls Hydro
D7'A Surface Mixer Deployment C"rwEey
Deployment of four 7-inch
surface mixers at Blewett Falls
Unit 5 during
2007 testing period
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D
++40*1 TA 2007 Environmental Monitoring C PEnergv
Tillery and Blewett Falls Water
Quality Monitoring Locations
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA Tillery Monitoring Stations Progress Energy
LaAe r glen -- -
I'illerv Dent s'y,1? x.,. I l ('li 12
1'1 ( nl 13 ,
11% NI1
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o
1'- CN12,1 mot.
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ly v
l.,
key
Turk-
/ Creek
Reach 1:
'T'iller-, Dam to "Turkey Ton
Creek Confluence (15.3 miles)
o.
,y Water Quality Monitor Type N PROGRESSENERGY
1 TILLERY HYDRO PLANT
roortn Carokna 6 Lake Tlllny • Level Logger
}?\ BbwatlFalls Laka Continuous WQ Monitor 1 Water Quality Monitor
0 05 1 2 3 4 5 6 Locations
South Carolina
Ploja t Location Niles
O`,
r
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA Blewett Falls Monitoring Stations?? "ressEnergv
Reach 2:
Blewett Falls Lake Blemcett Falls Dam
Blewett Falls Dam to just below '
Hitchcock Creek (7.1 miles)
z _.
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It U ( \ 1 I X14 + 74 ..
r {fir `? ?`
Itrc nI l It ?" Hitchcock
`? ? ? .TM=;d` ltl c,>tlc ; ?r Creek
BFC'N12
It P( n12.4 I3FCA13
ltrc
,x
O 1,000 2,000 4,000?"
Feet - ;44 ??.s
Water Quality Monitor Type N PROGRESS ENERGY
North Carolina j Lake..ery • Level Logger -' BLEWETT FALLS HYDRO PLANT
I?( {BMwanFaOSLake Continuous WQ Monitor 1 Water Quality Monitor
\t----"--"-- --- 0 0.5 1 2 3 4 5 6 Locations
South Carolina ..??
? . Project Location Miles
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA 2007 Study Results: General &L? ProgrmEnerff
• Worst Case Conditions tk'A?9
- The testing period in August,2007 was conducted in conditions
of extreme heat with daily air temperatures over 100 °F and
with strongly stratified lake conditions Q, I'd t4kd
• Diurnal Effect
- There is a strong diurnal influence on DO concentrations in the
downstream portions of each study reach. Oftentimes resulting
in supersaturated conditions from algal dynamics.
- At Tillery, this effect is particularly seen in downstream monitoring locations TYCM2A, TYCM3, and TYCM4 ?h ,off
e
- At Blewett Falls, this effect is particularly seen in downstream
monitoring locations BFCM2 and BFCM3 r6?? U's `l4 d?A?
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA 2007 Study Results: General ?.,
u_ P9ress Energy
Example of downstream diurnal effect at Blewett Falls under steady flow conditions
August 4, 2007
12.0
11.0
10.0
9.0
8.0
a
E 70
e
d
O 6.0
i
' 5.0
0
D
4.0
3.0
2.0
I.0
12(
I1(
10(
90(
80(
70(
60(
50(
40(
30(
20(
10(
0.0 0
O - N M 7 Vi ?O h o0 Q. O _ N ? 7 ?/'?V
_ N ? ? O N N N O
Time
BF Flow BFCMO BFCM I BFCM I A _ BFCM I B BFCM I C
BFCM2 BFCM2A BFCM3 Unit 5 No Air • Saturation Limit
?.
b
77 K
v
i
Test BF I (24-hr Test)
Flow 1325 cfs
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants v ,)( June 2, 2008
D'I'A 2007 Study Program (cont'd) Q P
Monitoring Data Collected
Upstream
- Forebay DO and temperature vertical profiles (AM / PM)
- Reservoir elevation
In-Plant
- Generator output & wicket gate setting (% open)
- Airflow measurements at turbine vent connections
- Ambient air temperature
Downstream
- Tailrace and downstream water surface elevations a
- Continuous temperature and DO monitoring
Near field tailrace and spillway areas
• Proposed water quality compliance locations ?
• Several downstream locations in impaired water quality reaches
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D
TA 2007 Study Results: Tillery ?4, PmgrmEnew
4 -
• The foreba at Tillery was strongly stratified with DO concentrations at the surface typically
in the 6 - 8mg/L rane and less than 0.5 mg/L near the hydro intake opening alul ?2*f` CI '°^
• Compressed air injection into the Unit 2 draft tube resulted in a 1.5 mg/L increase in
downstream DO concentrations
ressed air in' ection into the Unit 1 and Unit draft tubes resulted in a similar increase
• Comp J
of 1.5 mg/L in downstream DO concentrations. Adding additional air into Unit 1 is offset by
an increased volume of low DO water that must be treated.
• Surface mixing alone increases tailwater DO concentrations by approximately 0.5 mg/L for
the small scale testing conducted during 2007
• The combination of compressed air injection and surface mixing at Unit 2 resulted in an
increase in downstream DO concentrations of 2.0 mg/L
• Opening the vacuum valve on Unit 4 resulted in a 2.9 mg/L increase in downstream DO
concentrations ,?)
• Surface minimum flow releases resulted in DO gains of 1.5-3.0 mg/l; additional tests will be
conducted in 2008 to achieve flow targets. 94° 4 C A a C?I -%k*
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA 2007 Study Results: Tillery .? ????y
140
130
130
11 0
100
90
u
E
8.0
i
u
p 70
9
d
6.0
50
40
30
3.0
I.0
0.0
Dissolved Oxygen Concentrations and Flow at all continuous monitoring locations
August 14, 2007
4
3
3
3
3
2
9
6
3
0
0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 o c o 0 0 0
O - l`I to V N . !? 00 P C 0 _ o
0 0
!'I
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0 0 0 0 o g o °o °o °o
0
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I fl fl C
_
-
Time _ _ _ - C
TYCM0 ----^°TYCMI TYCMIA TYCM3 TYCM2A
TYCM3 TYCM4 TYCM 12 ?-'° TYCM 13 -4- Unit-" No Air
0- Unit 2 Mixing 0 Unit 2 Air &, Mixing Saturation Limit TY Flow
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA 2008 Study Plan: Tillery PW= E,eW
Plans for Continued DO Enhancement Studies
at Tillery in 2008
• Surface water release of minimum flow for 24-48 hours
• Compressed air injection Units 1, 2 & 3
- Further testing of this technology based on 2007 results
- Continued testing of Unit 4 in combination with the above units
- Flow estimates below power plant to evaluate tailrace mixing and DO
dynamics
• Surface mixing in forebay
- Further testing of this technology based on 2007 results
otl?
• Air diffusion in forebay
- Initial testing of an air diffuser (bubbler) system in the Unit 2 forebay
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D TA 2007 Study Results: Blewett Falls Q Pmgr=Envw
• Stratification in the forebay at Blewett Falls varied throughout each testing day from strongly
stratified to weakly stratified depending on station operations and diurnal effects. Surface DO
concentrations were in the 6-13 mg/L range and DO concentrations near the intake were in the 1-5
mg/L range.
• An underwater silt depositional berm upstream from the intake structure is likely functioning as a
skimmer weir; increasing incoming DO concentrations.
• DO concentrations in the immediate tailwater increase 1-3 mg/L during periods of generation when
compared to periods of non-generation (even with the vacuum breaker valves closed).
• There is an immediate, incremental increase in DO concentrations of 1-1.5 mg/L in the tailwater
when the vacuum breaker valves are opened.
• Operating the small 7-inch diameter surface mixers boosts DO concentrations in the tailwater by
approximately 0.5 mg/L. This increase is in addition to gains associated with running units with the
vacuum breaker valves open.
• Based on study results, there appears to be a high probability of meeting state DO standards (4
mg/L daily minimum; 5 mg/L daily average) using a combination of the proposed future minimum
continuous flow (1200 cfs), opening existing vacuum breaker valves, and surface water mixers. In
most cases, the standards will be met by the continuous minimum flow alone. '? "" • ;tj+
Progress Energy Comprehensive DO Enhancement Program ?tjng
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D TA 2007 Study Results: Blewett Falls h? P rm Energy
Proposed minimum continuous flow without and with air valves open
August S, 2007
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Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
DTA 2008 Study Plan: Blewett Falls C, Energy
Plans for Continued DO Enhancement Studies at
Blewett Falls in 2008
• Testing during 2008 will focus on operating regimes and
technologies previously tested during 2006 and 2007.
• The difference for the 2008 study is that these operating regimes
and technologies will be combined in a stepwise methodology to
demonstrate if compliance with state DO standards can be
achieved while minimizing significant power losses associated
with opening vacuum breaker valves during generation.
• Tests will be performed by the power plant operators on a real
time basis to react to DO concentrations and implement
mitigative measures over a period of time.
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
?DTTA Psavw EneW
Continuous Water Quality Monitoring: 2004-2007
• Purpose
- Assess the spatial and temporal patterns of DO concentrations in the Pee Dee River
downstream of the Tillery and Blewett Falls Hydroelectric Plants
• Generation vs. non-generation conditions
• Stratified vs. de-stratified conditions
- Provides an interim measure for evaluating temperature and DO concentrations in
the river with varying flow and weather conditions
- Supporting data for evaluation of turbine venting tests
- Transition to permanent compliance monitoring points will occur by 2010-2011
• Methodolo s'
gY IA *J14
- Continuous in-situ monitoring (lateral and longitudinal) in tailwater reaches
- DO, temperature, pH, specific conductance
• Conditions tested
- Low and high flow conditions, varying meteorological conditions
- Typical startup and shutdown operational sequences
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
Continuous Dissolved Oxygen Monitoring Program
D Stud Ma of Monitoring Locations mw Energy
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Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
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Continuous Dissolved Oxygen Monitoring Program
D 2007 Water Tem eratures reliminar results ` P nm Ene
Ti p (p y ) vt ro9 r9Y
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35
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Date
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Temperature Standard 5 U
Blewett Falls Daily Temperatures
40
35
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BFCM 1 BFCM2
BFCM3 BFCM I A
Temperature Standard
ol?
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
D ontinuous Dissolved Oxygen Monitoring Program
07 DO Preliminary Results k ?9nm Energy
Tj 20
Tillery-2007
50 5. .2-14.0)
40
= 7.3 1.8-17.0)
as 30 ---
v
a? 20 -- -
a 10 -
o
TYCM 1 TYCM2 _
6.8 (2.6-14.1
8)
TYCM3 TYCM4
¦ < 2.0 mg/I ¦ 2.0-2.9 mg/I ¦ 3.0-3.9 mg/I ¦ 4.0-4.9 mg/I
50 Blewett Falls-2007
40 6.1 (0.5-13.5) 5. - .7)
2
1
4
11
5
6
v (
.
-
.
)
.
30
as
20
IL
10
BFCM1 BFCMi Station BFCM:&- BFCM3
¦ < 2.0 m /I ¦ 2.0-2.9 m /I ¦ 3.0-3.9 m /I ¦ 4.0-4.9 m /I
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
Continuous Dissolved Oxygen Monitoring Program
D 2004-2007 Results
• Tillery Hydroelectric Plant
-Monitoring has indicated low DO concentrations occur in tailwaters
from mid-to late May and persist until September to early October,
depending upon inflow and prevailing weather conditions.
-DO concentrations generally increase with increased distance
downstream from the power plant due to re-aeration and tributary
inflow. Some localized DO effects from Brown Creek and other
smaller tributaries have been noted.
-DO concentrations are affected by natural diel cycles of algal
photosynthesis and respiration, which was especially evident at
TYCM 1 and TYCM2.
Progress Energy
Tillery and Blewett Falls Hydroelectric Plants
-?- t'?3
Comprehensive DO Enhancement Program Meeting
June 2, 2008
Continuous Dissolved Oxygen Monitoring Program
D
+104 Ti 2004-2007 Results'
• Blewett Falls Hydroelectric Plant
- Monitoring indicated low DO concentrations occur in tailwaters from
mid-to late May and persist until September to early October, depending
upon inflow and prevailing weather conditions.
- DO sags during summer to early autumn months not quite as pronounced
as Tillery due to shallow nature of the lake, bathymetry configuration of
intake canal, degree of river inflow, and plant operations.
- DO concentrations did not consistently increase with increasing distance
from the power plant.
- DO dynamics at Stations BFCM2 and BFCM3 are strongly influenced by
algal photosynthesis and respiration.
- Station BFCM2 may have also be affected by inflow from Cartledge
Creek and/or backwater effects due to a downstream channel hydraulic
control.
Progress Energy Comprehensive DO Enhancement Program Meeting
Tillery and Blewett Falls Hydroelectric Plants June 2, 2008
Continuous Dissolved Oxygen Monitoring Program
ram C
D Proposed Changes for Monitoring Program
Ti g g v_ Progma B"9Y
Tillery Hydroelectric Plant
01j.-.
??
- Drop Stations TYCM3 and YCM4, retain Stations TYCM 1 and
TYCM2. e
- Add two continuous monitors at N.C. Highway 731 Bridge
(Station TYCM 1) to evaluate lateral channel differences in
temperature and DO (mid-channel and west channel).
- Will provide additional data to
compliance monitoring point.
Blewett Falls Hydroelectric Plant
make decisions about the
C
Drop monitoring Stations BFCM2 and BFCM3 and retain BFCM 1 Z?
and BFCM 1 A.
Progress Energy
Tillery and Blewett Falls Hydroelectric Plants
T( C_Ylf\t?)
Comprehensive DO Enhancement Program Meeting
June 2, 2008
D TA
&? Pmgrm EneW
END
Progress Energy
Tillery and Blewett Falls Hydroelectric Plants
Comprehensive DO Enhancement Program Meeting
June 2, 2008
1735000 1735200 1735400 1735600 1735800 1736000 1736200 1736400 1736600 1736800 1737000 1737200 1737400 1737600
i
i
Elevation Contours
17 TL. -
.. +
,wJ
A .
1735000 1735200 1735400 1735600 1735800 1736000 1736200 1736400 1736600 17368 1737000 1737200 1737400 1737600