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Home My WebLink About20030147 Ver 2_Meeting Minutes_20080602 ??O-R a6l4ceX P-?? P OJA r '' (( - ,cam A,.,?. 7 I Wup' 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 T A 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 i L n1 .?x;.t S a ? 4 1 t{ # µ TITJ v AM, n t~ a. ? F y i` `-? C_ r. _` Y . _ ? ? mow,. IL 'k i •._A7w.F..a Yin-+ .a+ _ t 2GO?37 ..... ... , r.». .a wr 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 + /? ¦arir rar >roirr w? rrr ? i wrwwr ?? ,; C ? ? j 1 r ? ^` ?=+r w1?N7 ?r ww jAMN µ ,?M?w.w ? r.r. Yr1 ?w ? aw„" ?'+ ?. G. :1ti0, t d, .+?..r. i ? Nrwrn "i aw?waWwtwri'4 k' ? ? ?? 7 Wt ? `? wa+ua .rs.rr r?r.ri?..? .w. ? ? wws.ariro ? ? ? NI +i + ;x Surface Vii. tLr . r? 7- -7 Cy .. ."!"'"Y' ?+?'? i Zone r,rry .."• rer' w..r.rs ?' ?ww."a!f•.?w?rws..AiaiMwl/a.?r.?r Yr?¢ •.a? rr! ??... _ 4"M wow ! Zfli a7 w? it .rte L,,rr i ? ain Cirri. ? ??? ? _ .Z,x:. 4i 1 r » . N i A-9*0" MIS : Ij , 4 4 } S..." MMwr Mr{'tiAri ?f a ?Mi w?. _.... «.......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 ,. 1 hrA \`. r? c nl o z,ooo 4,00 o 1'- CN12,1 mot. Q? 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 _. C t.3, t ' 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 _ o 0 0 0 0 0 0 o g o °o °o °o 0 P O 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 i:.V 11.0 10.0 9.0 8.0 TO e u u 6.0 E c 5.0 n D 4.0 3.0 2.0 1.0 0.0 I I( 10( 90( 80( 70( 60( 50( 40( 30( 20( 10( 0 O 0 O 0 O 0 O O o - rl M ? v1 D t? 0 O 0 0 W O. O 0 0 0 O 0 rl M 7 ? ? 0 0 0 O O 0 O 0 n W ? O rl M 0 Time BF Flow BFCMO BFCM2 BFCM2A BFCM I o BFCM3 -- BFCM I A Unit 5 N Ai BFCM I B 13FCM I C -0-U rati n Li it 5 Ai ¦ S t o r n r a u o n 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 TA Y p 9 Lake 2111ety - - - f V. i t Rua-ky ? Rivcl' '1'YC ']U o- e.ooo z,ooo 1'1"( :12,1 Feet ? ?1I3 r'Fu?i,key ?i "' 731o??n ? . . BL cnclt Fa1Lv Lake nn leu rkl ? 7- '-- III--tt Falls Dam . _ I I I41?1 \ ?Q - ? -- li \.1114 •;?' v.,t ZS3 111ta•hcucl: ?1'lt•1C ' 131`L'1?I2 - 1- j ? 9l r,.i i > ?•? etk Water Oualrt Monitor Type N TILLERY AND BLEWETT FALLS Level Logger _ HYDROELECTRIC PLANTS eewett ?.i?a ?.we O Continuous WQ Monitor Water Quality Monitor ` 0 0.5 1 2 3 4 5 6 Locations Smnf, Cvol?ne ? project Lo Ml- / V - M,, 111 Progress Energy Comprehensive DO Enhancement Program Meeting Tillery and Blewett Falls Hydroelectric Plants June 2, 2008 o (Ia C7 ? C. ? A e? "Jej w y a 0 b a? 0 v; n Dissolved oxygen (mg/L) J J -4 J O N? Ol co O N 4 d7 5/3/2006 5/17/2006 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 < 8/9/2006 3 d w 8/23/2006 9/6/2006 9/20/2006 10/4/2006 10/18/2006 11/1/2006 11/15/2006 11/29/2006 0 0 A a A v 0 0 a? 0 ft A A c b 0 vc 0 9 N 3 CD o o? 0o va 11/29/2006 Dissolved oxygen (mg/L) Dissolved oxygen (mg/L) ? ? r r O N E 01 O O N P C1 5/3/2006 5/17/2006 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 n 8/9/2006 3 v a, e 8/23/2006 9/6/2006 9/20/2006 10/4/2006 10/18/2006 11/112006 11/15/2006 O N E a) Cr O N 41 O 5/3/2006 5/17/2006 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 p 8/9/2006 $ 8/23/2006 9/6/2006 9/20/2006 10/4/2006 10/18/2006 11/1/2006 11/15/2006 11/29/2006 O Di N ss ? olved oxyg s r MOD 0N en r ? (m r 0 g/ ? c L) N o0 5/3/2006 5/17/2006 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 n 8/9/2006 v 3 N e 8/23/2006 9/6/2006 9/20/2006 10/4/2006 10/18/2006 11/1/2006 11/15/2006 11/29/2006 l 1 O y ?. rD O Gn A? O CC C '? CD Gn ? v N O ? O ? CD ? O Ir• ?. Nr. ? Q o ? QrQ I Al ? O. t to Z c 0 -o iv Dissolvaed Oxygen (mg/1) NNN?" O NJa C, 00 ONg. C) 5/1/07 5/16/07 5/31/07 6/15/07 6/30/07 7/15/07 7/30/07 8/14/07 8/29/07 9/13/07 9/28/07 10/13/07 10/28/07 11/12/07 11/27/07 Dissolvaed Oxygen (mg/1) O N i. C, co o NJ ? 5/1/07 5/16/07 0 5/:31/07 ^a 6/15/07 6/30/07 < 7/15/07 O 7/30/07 r? 8/14/07 8/29/07 9/13/07 9/28/07 0 va 10/13/07 N 3 10/28/07 N _ 11/12/07 0°0 11/27/07 n W .P Dissolvaed Oxygen (mg/1) IJ Li F-ti L.i O N ;. C? 00 O N A O 5/1/07 5/16/07 5/31/07 6/15/07 6/30/07 7/15/07 7/30/07 8/14/07 m 8/29/07 9/13/07 9/28/07 10/13/07 10/28/07 11/12/07 11/27/07 n Dissolvaed Oxygen (mg/1) NNNN? O N.P Cs 00 O N 4? C, 00 v d a l1 0 y ?. *Nod ? o y ? r'D C '? rD v N Q 0 J ? Mot WNow • Nr. M? 0 91 I ara Ay `? a t? w a. 0 "0 ,J n 0 3 a v O 0 0 b 0 (IQ o ?7 N 3 o - o a' Go vo 5/3/2006 5/17/2006 Dissolved oxygen (mglL) O N O co O N 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 p 8/9/2006 8/23/2006 9/6/2006 9/20/2006 10/4/2006 10/18/2006 11/1/2006 11/15/2006 11/29/2006 lA n 3 N Di O sso N lved oxyg 4 0 co O en N (mg A lL) O 5/3/2006 5/17/2006 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 p 8/9/2006 3 w 8/23/2006 9/6/2006 9/20/2006 10/4/2006 10/18/2006 11/1/2006 11/1512006 11/29/2006 Dissolved oxygen (mg/L) ..J J O N T O OD O N E 5/3/2006 511 712 0 0 6 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 W n p 8/9/2006 n 8/23/2006 9/6/2006 9/20/2006 10/4/2006 10/18/2006 11/1/2006 11/15/2006 11/29/2006 Dissolved oxygen (mg/L) O N 4 O co O N 4 5/3/2006 5/17/2006 5/31/2006 6/14/2006 6/28/2006 7/12/2006 7/26/2006 m p 8/9/2006 3 ro 8/23/2006 D 9/6/2006 9/20/2006 1014/2006 10/18/2006 11/29/2006 O 11/1/2006 11/15/2006 MEW 0 C ? ? O vs ? ksJ O O Inc C ? O A? rD M-d ,? O o ar0 v c ? a. 0 rfl ?s 0 Dissolvaed Oxygen (mg/I) F3 N N N O N T O 00 O N A C+ 5/1/07 5/16/07 5/31/07 6/15/07 6/30/07 0 7/15/07 CCD '.. 7/30/07 Q 8/14/07 s 8/29/07 9/13/07 9/28/07 b 10/13/07 o' ora 10/28/07 11/12/07 A N ? N 11/27,/07 o^ 00 IQ T N Dissolvaed Oxygen (mg/1) F+ ~ I, ONis O100 0 NJ 4. C) C? 5/1%07 5/16/07 5/31/07 I (i 6%15/07 6/30/07 7/15/07 7/30/07 ! m 8/14/07 1 ro 8/29/07 9/13/07 ML 9/28/07 10/13/07 10/28/07 ! ! I 11/12/07 11/27/07 T n Dissolvaed Oxygen (mg/1) H N N N O N A C., 00 O N A C, 5/1/07 r-- , 5/16/07 I 5/31/07 6/15/07 6/30/07 I 7/15/07 7/30/07 m 8/14/07 8/29/07 9/13/07 i 9/28/07 10/13/07 10/28/07 s ' 11/12/07 I 11/27/07 03 T W T (1 D r t:? L-5 n C pr• ? C v 0 O CD I*Mw/ CW 21 ?'C Continuous Dissolved Oxygen Monitoring Program D 2007 Water Tem eratures reliminar results ` P nm Ene Ti p (p y ) vt ro9 r9Y Tillery Daily Temperatures 35 30 ?j 25 20 15 CL m 10 r -- 5 O 0 0 0 0 0 0 N N = 0 0 0 0 0 0 N N ? O 0 0 `J 0 0 =J 0 0 N 0 0 0 0 0 0 0 0 0 0 ? N N N = 00 t0 O 0 0 0 0 N N M ai'? ? N a!f aa7 ? C cD cD I? N ? ? N O ? C 07 d O Date TYCM I TYCM2 1 n 5 TYCM3 TYCM4 _ l ,?? -" r Temperature Standard 5 U Blewett Falls Daily Temperatures 40 35 _ 30 v a ? 25 20 to d cL 15 F 10 5 0 r- O O O O 6 O O O O O O O N?J N N ?V ?J O O N O O N O O N O O $?J O O O 6 O O N ??J O O N O O N O O N •f> Q? N cp O ??J N 4'? u-i t0 tG 1? N N tZ O N 00 T OO N cp _O O7 ? O O M O h N Date 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