ML19305A897

Forwards Rept to Mn Pollution Control Agency on Results of Special Chlorination Program,In Response to NRC 791102 Request

ML19305A897
Person / Time
Site:	Prairie Island
Issue date:	03/13/1980
From:	Mayer L NORTHERN STATES POWER CO.
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8003180552
Download: ML19305A897 (30)

Text

{{#Wiki_filter:-,. . +. _ - f-NSIB NORTHERN STATES 'P O W E R COMPANY M O N N E A PO L.I S. M I N N E S OTA S5401 . March 13, 1980 Director of Nuclear Reactor Regulation U S Nuc1 car Regulatory Commission Washington, DC 20555 -PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 dPR-60 Special Chlorination Program Mr Schwencer's letter of November 2, 1979 transmitting appropriate amendments to the referenced licenses, _ requested copies of our report- 'ing to the Minnesota Pollution Control Agency (MPCA) on the results of the subject program. Enclosed are six copies of our letter report to the MPCA. L0Mayer,h PE Manager of Nuclear Support Services LOM/ECW/jh cc: J G Keppler (2) G Charnorf Attachments-MPCA Attn: J W Ferman (w/o attachments) 8003180($t N

e e s\\ s' MSp NORTHERN 57ATES POWER COMPANY M IN N E A PO L.I S. M S N N E S OTA 5 5401 March 3, 1980 T K Scherkenbach, Chief Compliance and Enforcement Section Division of Water Quality Minnesota Pollution Control Agency 1935 West County Road B2 Roseville, Minnesota 55113 ATTENTION: D L KRIENS PRAIRIE ISLAND NUCLEAR GENERATING PLANT Chlorination of Circulating Water to Remove Parasitic Amoeba On November 7 and 21, 1979, the circulating water syatem at the Prairie Island Nuclear Generating Plant was trer.ted with chlorine in an attempt to reduce populations of the parasitic amoeba, Naeglaria fowleri. The Minnesota Pollution Control Agency granted approval of the treatment procedure on October 29, 1979. The Agency's letter of approval requested submittal of a comprehensive report on the success of the chlorination. NSP and Agency staff agreed to delayed submittal of the report to allow time for additional sampling and analysis to evaluate presence of the amoeba in the circulating water system. We have received the results from samples taken in January and are, therefore, submitting the report at this time. I. Treatment Procedure The objective of the treatment plan was to reduce populations of N. fowleri by adding sufficient chlorine to maintain 2mg/l free chlorine in the circulating water for a six hour period. To aid the effectiveness of chlorination a biodispersant was added witn the chlorine. i i

NORTHERN GTATED POWER COMPANY k T K Scherkenbach, MPCA P I Chlorination Page 2 March 3, 1980 i The treatment plan consisted of two phases. Phase One took place on November 7, 1979 and occurred during helper cycle operation (cooling towers in service with no recirculation) and was limited to chlorination of the cooling towers with subsequent dechlorination prior to discharge. The purpose of Phase One treatment was to remove accumulated biological growth from the cooling towers and prevent its re-introduction to the circulating water system at the plant intake. The anticipated sloughing off of large amounts of biological material was not observed, however. The dechlor-ination effort was successful as evidenced by no detection of chlorine in the discharge canal. Phase Two of the treatment took place on November 21, 1979 and consisted of closed cycle operation (with a blowdown of approximately 25 cfs) with cooling towers in service. The purpose of the 25 cfs blowdown was to maintain a net loss of water in the system to prevent chlorinated water from escaping from the system under the. skimmer wall at the plant intake. A biodispersant was utilized to aid the chlorine treatment. Dechlorination of the 25 cfs discharge occurred continuously during Phase Two. Following the six hour chlorination period, the entire circulating water system was dechlorinated. Both dechlorination efforts proved successful as shown by no detectable chlorine measured in the discharge canal. Attachments One through Eight accompanying this report contain detailed information for both Phase One and Two regarding a description of the chemical addition, a log of occurrences during the treatment and the results of monitoring for both free and total residual chlorine.

NORTHERN CTATED POWER COMPANY T K Scherkenbach, MPCA P. I Chlorination Page 3 March 3, 1980 II. Fish Removal As we noted in our October 25, 1979 letter to the Agency requesting authorization to conduct the chlorination treat-ment, chlorine at 2 mg/l (free) would be lethal to fish residing in the cooling tower return canal and recirculation canal. Prior to Phase One chlorination, NSP biologists worked in conjunction with Minnesota Department of Natural Resources personnel and made several attempts to collect and remove fish from the circulating water system. Methods employed included electroshocking, seining, and trawling. These attempts were largely unsuccessful and some fish were killed during removal operations. Attachment Nine lists fish killed during removal operations. Three attempts were also made to " drive" fish out of the circulating water system using copper sulfate as a dispersant at MDNR concentration recommendations (0. 3 ppm). While it is not precisely known if the dispersant was effective, no visible reactions by the fish were observed. During chlorination, NSP and MDNR biologists captured and released some fish which survived the chlorine treatment. Prior to and during the chlorination, a total of 1,625 fish were captured and released into the discharge canal. Although many carp were captured, they were not returned to the river according to state regulations. These carp are included in the total number of fish killed. Attachment Ten presents a list of fish returned alive to the discharge canal. During Phase One Chlorination, some fish residing in the cooling tower return canal were killed. Many of these fish were collected in the discharge canal following expulsion from the cooling tower return canal through the discharge gates. Attachment Eleven lists all species killed during Phase One Chlorination. l t l l

NORTHERN STATES POWER COMPANY T K Scherkenbach, MPCA P I Chlorination Page 4 March 3, 1980 During Phase Two Chlorination, nearly all fish residing in the circulating water system were affected. Many were sub-sequently impinged on the plant's bar rack or vertical traveling screens. NSP and MDNR biologists also picked up many dead fish laying in the recirculation and intake canals. Although some fish were enumerated individually, an estimate had to be made of the total killed due to the large number involved. This was accomplished by determining the number and species composition of five randomly chosen five-gallon buckets and extrapolating this information to the total number of buckets counted. Attachment Twelve presents fish counted individually and those estimated to have been killed during Phase Two Chlorination. A total of 53,289 fish were estimated to have been killed during fish removal and chlorination operations. Of these, 46,450 (87.2%) were gizzard shad, primarily young-of-the-year ( $160 mm total length). Assuming an average weight of 40 grams per fish, approximately 4100 pounds of forage was lost due to the death of the gizzard shad. The second most abundant species killed was channel catfish (3,172) which comprised six percent of the total. While some of the catfish were quite large, the majority were juveniles (f200 mm total length). Game and panfish collectively comprised less than one percent of all fish killed. III. Amoeba Test Results Attachment Thirteen to this report presents the results of samples analyzed for presence of the thermophilic amoeba, Naeglaria fowleri. The samples taken in September, 1979 show the greatest percentage of samples indicating positive presence of the organism. Twenty-seven of thirty sediment samples and all nine water samples gave positive results for presence of the amoeba. It was upon receipt of these test results on September 25 that NSP contacted the Minnesota Department of Health to inform them of the presence of ((. fowleri at Prairie Island. Subsequent contact and meetings with the staff from the MN Dept of H7alth, MPCA, and MDNR resulted in the development ~of the chlorination treatment program conducted at the plant.

T K Scherkenbach, MPCA P I Chlorination Page 5 March 3, 1980 The next series of samples was taken on November 6, 1979 prior to the chlorination treatment. Eight of eighteen sediment samples and one of seven water samples showed positive indication of the amoeba. Note that this repre-sents a substantial reduction in amoeba density even though no chlorination had yet occurred. Samples taken November 26, 1979 following Phase One and Two Chlorination indicate one of thirty sediments and one of six water samples as positive. The most recent samples, taken January 14, 1980 show three of fifteen sediments positive, with all six water samples negative. While it is apparent that the population density of the amoeba has decreased since September, 1979, it cannot be stated with certainty that the chlorination treatment pro-gram was the cause. The onset of cold weather or other factors may also have had a contributing influence to decrease population density. Sampling for the amoeba is continuing, initially on a twice per month basis. Any future treatment requirements will depend upon the osul obtained from the sampling program. 9 t R D CLOUGH, ASSISTANT ADMINISTRATOR Special Projects jp bcc: J L Bechthold R O Burmeister attachments P W Comstock L W Eberley cc Howard Krosch, MDNR D E Gilberts Russell Frazier, MN Dept of Health J M Pappenfus F P Tierney E C Ward (8)V l G V Welk l t ~~.

LIST OF ATTACHMENTS ONE - Phase One Description TWO - Phase One Chlorination Log THREE - Phase One Free Chlorine Analysis Results FOUR - Phase One Total Residual Chlorine Analusis Results FIVE - Phase Two Description SIX - Phase Two Chlorination Log SEVEN - Phase Two Free Chlorine Analysis Results EIGHT - Phase Two Total Residual Chlorine Analysis Results 1 ) NINE - Fish Killed During Fish' Removal Operation Prior to Chlorination TEN - Fish Returned Alive to Discharge Canal ELEVEN - Fish Killed During Phase One Chlorination TWELVE - Fish Killed During Phase Two Chlorination THIRTEEN - Amoeba Test Results FOURTEEN - Amoeba Sampling Site Locations

ATTACHMENT ONE Phase One Description A. Plant Operation - Helper Cycle 1. Unit 1 on line 2. Unit 2 on line j 3. Discharge gates open j 4. Recycle gates closed 5. All cooling towers in service 1 B. Chemical Treatment 1. Chlorination a. Chemical: liquid sodium hypochlorite b. Concentration: 12.5% sodium hypochlorite c. Injection point: inlet of Cooling Tower Pump Basin d. Injection rate: 44 gpm e. Total chemical used: 7,300 gallons 2. Biodispersant a. Chemical: Nalco 7348 b. Injection point: inlet of Cooling Tower Pump Basin c. Injection rate: 1-1.5 gpm (Fed with sodium hypo-chlorite to maintain about 2 ppm Nalco 7348 in circulating water) 3. Dechlorination a. Chemical: Sodium sulfite b. Concentration: One pound sodium sulfite per gallon of water c.- Injection Point: Weir between Cooling Tower Canal and Discharge Canal d. Injection Rate: 6-60 gpm e. Total chemical used: 13,000 pounds l

ATTACHMENT ONE (CONTINUED) C. Monitoring 1. Sample point location a. Cooling tower pump discharge " Pump House" b. Cooling tower canal prior to the weir "CT Canal" c. Discharge canal sample through R21 Radiation monitor sample pump discharge - " Discharge Canal" f 2. Chlorine measurement test methods - Iodometric titration utilizing amperometric endpoint 3. -Chlorine monitoring frequency - Grab samples at approximate 30 minute intervals 4 ) I 1 I i 5 4 i l 1 I

ATTACHMENT 2 PHASE ONE CHLORINATION LOG PUMP HOUSE COOLING 'IOWER CANAL DISCHARGE CANAL TIME COMMENTS FREE 'IOTAL FREE TOTAL 'IOTAL CHLORINE RESIDUAL CHLORINE RESIDUAL RESIDUAL mg/l CHLORINE mg/l CHLORINE CHLORINE mg/l mg/l mg/l 1045 Prior to chlorination 0.0 1053 Prior to chlorination 0.0 1055 Start C12 feed at 44 gpm 1100 Start Na2SO3 feed at 44 gpm 1.9 3.1 1102 4.9 6.0 1106 0.35 1109 0.0 1112 1.7 3.0 1118 Increase Na2SO3 feed to 60 gpm 0.0 1120 7.3 1125 8.9 12 1130 4.0 6.8 0.0 1138 7.4 1139 0.0 1145 7.4 1150 0.0 1200 0.0 1202 8.0 1205 6.9 12.4 1215 8.7 0.0 Page 1

~__ __ - ATTACHMENT 2 CON'T PHASE ONE CHLORINATION LOG PUMP HOUSE COOLING TOWER CANAL DISCHARGE CANAL TIME COMMENTS FREE. TOTAL FREE TOTAL TOTAL CHLORINE RESIDUAL CHLORINE RESIDUAL RESIDUAL mg/l CHLORINE mg/l CHLORINE CHLORINE mg/l mg/l ag/l 1230 8.5 0.0 1235 4.1 11.8 1238. Stopped C12 feed due to inability to mix Na2SO3 solution fast enough. Approximately 4,800 gallons of sodium hypochlorite added thus far. Continuing Na2SO3 addition at 60 gpm. 1 1245 0.0 l 1250 7.0 i 1255 Cut feed of Na2SO 3 to 6 gpm. 1300 0.0 1310 0.26 l 1320 0.04 0.02 1322 Pecheck of 1320 0.0> discharge canal sample. 1325 Stopped Na2SO feed. Approximately 7,400 pounds of Na2SO3 added 3 thus far. 1425 Start C12 feed at 44 gpm. 1430 Start Na2SO3 feed at 60 gpm. 4.2 5.0 4 1440 1.4 1445 0.0 . 1455 3.1 10.8 8.0 1500 0.0 -Page 2

~ ATTACHMENT 2 CON'T PHASE ONE CHLORINATION IDG PUMP HOUSE COOLING TOWER CANAL DISCHARGE CANAL TIME COMMENTS FREE TOTAL FREE TOTAL 'IOTAL CHLORINE RESIDUAL CHLORINE RESIDUAL RESIDUAL mg/l CHLORINE mg/l CHLORINE CHLORINE mg/l mg/l mg/l 1507 8.4 1515 0.0 1519 Stopped C12 feed. Approximately 2,500 gallons of sodium hypochlorite added since 1425. 1522 7.2 1525 2.9 4.0 1530 0.0 1539 1.8 1540 Cut Feed cf Na2SO3 to 30 gpm. 1545 0.0 1555 0.04 0.19 1600 0.0 1604 0.09 l feed. Approximately 5,600 pounds of Na2SO3 added 1610 Stopped Na2SO3 since 1430. 1612 0.0 1615 0.0 1630 0.0 1645 0.0 Page 3

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ATTAC!! MENT FIVE Phase Two Description A. Plant Operation - Closed Cycle 1. Unit 1 on line 2. Unit 2 on line 3. Discharge gates closed to allow approximately 25 cfs blowdown from system 4. Recycle gates open 5. All cooling towers in service B. Chemical Treatment 1. Chlorination a. Chemical: liquid sodium hypochlorite b. Concentration: 12.5% sodium hypochlorite c. Injection point: inlet of Cooling Tower Pump Basin i d. Injection rate: 10-44 gpm e. Total chemical used: 3,600 gallons 2. Biodispersant a. Chemical: Nalco 7348 b. Injection point: inlet of Cooling Tower Pump Basin c. Injection rate: 1-1.5 gpm Fed with sodium hypochlorite to maintain about 2 ppm Nalco 7348 in circulating water. ) 3. Dechlorination of 25 cfs blowdown a. Chemical: sodium sulfit.3 b. Concentration: 0.2 lb sodium sulfite per gallon of water c. Injection point: opening of discharge gate d. Injection rate: 7-10 gpm e. Total chemical used: 750 pounds 4. Dechlorination of circulating water prior to discharge t a. Chemical: sodium sulfite L Concentration: one pound sodium sulfite per gallon of water c. Injection point: inlet of Cooling Tower Pump Basin d. Injection rate: 70 gpm e. Total chemical used: 5,000 pounds i

ATTAC11MEFT FIVE (CONTINUED) C. Monitoring 1. Sample point location a. Cooling tower pump discharge " Pump House" b. Adjacent to discharge structure prior to entering recirculation canal " Discharge Structure" + c. " Recirculation Canal" d. " Condenser Inlet" e. Discharge canal sample through R21 radiation monitor sample pump discharge " Discharge Canal" 2. Chlorine measurement test methods a. Iodometric titration utilizing amperometric endpoint at Points a,b,c, and e. b. DPD colorimetric at Sample Point d. 3. Chlorine monitoring frequency a. Grab samples from Sample Points a,b,d, and e at approximate 30 minute intervals b. Grab samples from Sample Point c taken periodically. E e

^ ^ PHASE 'IWO CHLORINATION LOG DISCHARGE RECIRCULA-i CONDENSER DISCHARGE PUMP HOUSE STRUCTURE TION CANAL INLET CANAL FREE TOTAL FREE TOTAL FREE TOTAL FREE TOTAL TOTAL TIME COMMENTS C12 RES* Cl3 RES* C12 RES* Cl2 RES* RES* mg/l C12 mg/l C12 mg/l C12 mg/l C12 C1 2 mg/l mg/l mg/l mg/l ag/l 0807 Prior to chlorination. 0.0 0825 Start cl2 feed at 22 gpm. 0.0 0830 Start Na2SO3 feed at 7 gpm (0.2 pound / gal solution) at 25 cfs blow down to discharge canal. 0840 2.7 40.2 40.5 0845 Noted that Cl2 feed is 15 gpm. 0850 0.2 0.8 0854 0.0 0855 0.11 0904 0.3 0.9 0910 3.0 3.8 0911 Increase C12 feed to 30 gpm. 0914 0.2 0.6 0921 Increase Cl2 feed to 44 gpm. .0925 ~. 0.68 0.0

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~ 3 ATTACHMENT 6 CON'T PHASE %V CHLORINATION LOG 4 DISCHARGE RECIRCULA- ' CONDENSER DISCHARG PUMP HOUSE STRUCTURE TION CANAL INLET CANAL FREE TOTAL FREE TOTAL FREE TOTAL FREE TOTAL 'IOTAL TIME COMMENTS C12 RES* Cl2 RES* Cl2 RES* Cl2 RES* RES* mg/l C12 mg/l C12 mg/l C12 mg/l C12 C12 mg/l mg/l mg/l mg/l mg/l 0930 0.9 1.5 0935 0.0 0940 8.5 9.2 2.1 3.0 0950 0.0 ~ 0955 1.7 0.0 1006 Increase Na2SO3 feed at discharge to 10 gpm. 1010 > 10 20 1014 2.7 3.6 1017 Stop C12 feed (ncte that Na2SO3 feed at discharge continues). 2,850 gallons of sodium hypochlorite added'thus far. 1020 0.0 1025 9.3 10.6 5.1 1030 >3 11 0.0 1041 6.8 1050 6.5 8.9

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ATTACHMENT 6. CON ' T PHASE 'IWO CHLORINATION LOG DISCHARGE RECIRCULA- ' CONDENSER DISCHA Rt, PUMP HOUSE STRUCTURE TION CANAL INLET CANAL FREE TOTAL FREE TOTAL FREE TOTAL FREE TOTAL TOTAL TIME COMMENTS Cl2 RES* Cl2 RES* C12 RES* C12 RES* RES*- mg/l C1 2 mg/l C12 mg/l C12 mg/l C12 C12 mg/l mg/l-mg/l mg/l mg/l 1055 6.8 0.0 1110 5.2 6.9 1115 6.4 1120 6.0 7.9 1124 0,0 1125 6.2 r 1130 Decrease Na2SO3 feed'to 7 gpm 1135 0.0 1140 4.3 1145 4.5 i

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~ t ATTACHMENT 6 CON *T PHASE TWO CHLORINATION LOG DISCHARGE RECIRCULA- ' CONDENSER DISCHARC PUMP HOUSE STRUCTURE TION CANAL INLET CANAL FREE TOTAL FREE TOTAL FREE TOTAL FREE TOTAL TOTAL TIME COMMENTS C12 RES* C12 RES* C12 RES* Cl2 RES* RES* mg/l C12 mg/l C12 mg/l C12 mg/l C12 C12 mg/l mg/l mg/l mg/l mg/l 1155 4.2 0.0 1210 3.4 1215 3.8 1225 2.8 0.0 1235 3.0 1240 2.5 3.8 2 feed at 10 gpm. 1245 Start C1 0.0 1255 1310 8.0 9.6 1315 2.4 1325 4.7 6.3 3.4 0.0 1335 4.7 6.0 1340 7.3 8.4 l i feed. 750 gallons of sodium o,o 1345 Stop C12 hypochlorite added since 1245. (Note that dechlorination of 25 cfs blowdown continues).

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t ATTACHMENT 6 CON'T PHASE 'IWO CHLORIWATION LOG DISCHARGE RECIRCULA- ' CONDENSER DISCHARG: PUMP HOUSE STRUCTURE TION CANAL INLET CANAL FREE TOTAL FREE TOTAL FREE TOTAL FREE TOTAL 'IOTAL TIME COMMENTS C12 RES* Cl2 RES* Cl2 RES* C12 RES* RES* mg/l Cl2 mg/l Cl2 mg/l C12 mg/l C12 C12 mg/l mg/l mg/l mg/l mg/l 1355 4.8 1410 3.9 6.0 1415 4.1 1425 4.2 0.0 1435 4.0 5.3 1443 3.2 1455 3,4 0,0 1509 2.7 1515 3.0 4.2 1525 1.8 0.0 1528 2.3 3.5 1530 Start dechlorination of circulating water. Na2SO3 feed rate is 70 gpm. 1545 0.0 2.5 1555 3.0 .1600 0.0

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t ATTACHMENT 6 CON'T PHASE TWO CHLORINATION LOG' DISCHARGE RECIRCULA-i CONDENSER DISCHARG PUMP HOUSE STRUCTURE TION CANAL INLET CANAL FREE TOTAL FREE TOTAL FREE TOTAL FREE TOTAL TOTAL TIME COMMENTS C12. RES* C12 RES* Cl2 RES* C12 RES* RES*- mg/l C12 mg/l C12 mg/l C12 mg/1. C12 C12 mg/l mg/l mg/l mg/l mg/l 1615 0.0 0.0 1625 0.07 1630 0.0 0.0 1640 Stop dechlorination. 5,000 pounds of Na2SO3 added. 1645 Stop dechlorination of 25 cfs blowdown. 0.0 0.0 1655 0.05 1700 0.0 1715 0.0 0.0 1725 0.05 1745 0.0 0.0 1755 0.0 t-T

• RESIDUAL Page 6

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ATTACHMENT 9 e TOTAL OF FISH KILLED DURING FISH REMOVAL OPERATIONS PRIOR TO CHLORINATION Gizzard Shad 1,814 Shiner and Minnow sp 13 Channel Catfish 1 Sauger-l' TOTAL' 1,829 l ? a i i t t - I l-L l j,. t ~,. - .n s

ATTACHMENT 10 TOTAL OF FISH RETURNED ALIVE TO DISCHARGE CANAL DURING AND PRIOR TO PRAIRIE ISLAND PHASE I AND II CHLORINATION Shortnose Gar 1 Longnose Gar 1 Gizzard Shad 632 Mooneye 1 Shiner and Minnuw sp 368 Caprsucker sp 67 Smallmouth Buffalo 17 Bigmouth Buffalo 6 Shorthead Redhorse 2 ~ Flathead Catfish 21 Channel Catfish 366 White Bass 77 Rock Bass 1 Smallmouth Bass 4 Bluegill 16 Crappie sp 4 Walleye 2 Sauger 1 Freshwater Drum 38 TOTAL 1,625 4 I i-l f I L

~ " ATTACHMENT 11 TOTAL OF FISH KILLED DURING PRAIRIE ISLAND PHASE I CHLORINATION . Shinner and Minnow sp 53 Carp 52 Carpsucker sp 1 Bigmouth Buffalo 3 Flathead Catfish 1 Channel Catfish 111 Freshwater Drum 2 . TOTAL. 223 e i 't, I

ATTACHMENT 12 TOTAL OF FISH KILLED DURING PRAIRIE ISLAND PHASE II CHLORINATION Individually Counted Estimated Shortnose Gar 2 Northern Pike 1 Gizzard Shad' 1 44,635 Carp 168 14 Shiner and Minnow Sp. 336 1,224 Carpsucker Sp. 41 163 Smallmouth Buffalo 14 27 Bigmouth Buffalo 4 Tadpole Madtom 5 Bullhead Sp. 1 Flathead Catfish 31 Channel Catfish 734 2,326 White Bass 65 231 Rock Bass 14 Green Sunfish 1 Bluegill 21 41 Smallmouth Bass 2 Crappie ~Sp. 9 14 Walleye 5 14 Sauger 1 Freshwater Drum 167 925 Total 1,609 49,628 l-l-

ATTACHMENT 13 THERMOPHILIC AMOEBA ANALYSES Sample Location Sample Type No. of Samples No. of Samples with positive Positive indication af amoeba September, 1979 Intake Canal Water 3 3 100 Intake Canal Sediment 10 8 80 Cooling Tower Canal Water 3 3 100 Cooling Tower Canal Sediment 10 10 100 Discharge Canal Water 3 3 100 Discharge Canal Sediment 10 9 90 November 6, 1979 Intake Canal Water 2 0 0 Intake Canal Sediment 6 2 33 Cooling Tower Canal Water 3 0 0 Cooling Tower Canal Sediment 6 3 50 Discharge Canal Water 2 1 50 Discharge Canal Sediment 6 3 50 November 26, 1979 Intake Canal Water 2 0 0 l Intake Canal Sediment 10 1 10 Cooling Tower Canal Water 2 0 0 l Cooling Tower Canal Sediment 10 0 0 Discharge Canal Water 2 1 50 l Discharge Canal Sediment 10 0 0 January 14, 1980 Intake Canal Water 2 0 0 Intake Canal Sediment 5 1 20 Cooling Tower Canal Water 2 0 0 Cooling Tower Canal Sediment 5 1 20 Discharge Canal Water 2 0 0 . Discharge Canal Sediment 5 1 20

ATTACIDiENT 14 EMEEE_EEEhlE9_EITE_pggATfggg MISSISSIPPI RIYER +-WI NG D AM (TYP) BARNEY'S POINT \\ \\ x /~> "h (1.f.. Eh C ~.4 V. ( _/ / T..r. .. ),,) " ~.. ~.. .. sh APPROACH ..,..../'...,,* j i,,, - ~~ ..w ~ " 's y / ~. n.. s. C ~- -. "~~~ ,/ f CHANNEL , s-L., EMERGENCY N INTAKE p/ jj [.h y__( b' '( f ./.0 \\ l d' SHORELINE 1 o \\ d# w m-- - E \\ \\ M y RECYCLE CANAL ,, C,, BARRIER [rY 1 WALL 1 1 1/ y I NTAKE N CANAL \\ j I N 4 E POWER P COOLING N. HOUSE]- TOWERS (TYP) SCREENHOUSE o i r l-500 250 0 500 l SCALE IN FEET "A" - Amoeba Intake Sample "B" - Amoeba Cooling Tower Canal Sample "C" - Amoeba Discharge Canal Sample .}}