P. 2

• ^ 2 § fc r- = < a . _ *

o o ? 2 £ 

# Mos s Landin g Powe r Plan t Modernizatio n Project 316(b ) Resourc e Assessmen t

\ _



### April 28, 2000 Prepared

for: 

## ©Duk e Energ y Mos s Landing , LL C 65 5 3 r d Stree t P.M.B . 4 9 Oakland , C A 9460 7


### TENER A s ivironmsflts l On e Market , Spea rTower , Suit e 1850 , Sa n Francisco , C A 9410 5

(415 ) 536-4744 , FAX (415 ) 536-471 4 3427- A Miguelit o Court , Sa n Lui s Obispo , Californi a 9340 1 (805 ) 541-0310 , FAX : (805 ) 541-042 1 

## %o0pP. 3 

# I I i TENER A

Ma y 1,200 0

Mr . Roge r

W . Briggs , Executiv e Officer CaliforniaRegiona l Wate r Qualit y Contro l Board , Centra l Coas t Regio n 8 1 Higuer aStreet , Suit e 20 0 Sa n Lui s Obispo , C A 93401-542 7

m MOS S LANDIN G POWE RPLAN T MODERNIZATIO N PROJEC T SUBMITTA L O F 316(b ) RESOURC E ASSESSMEN T Dear Mr . Briggs : Pursuan t t o th e requirement s establishe di n you r Jul y 21 , 199 9 "Requirement s Letter " relate dto thi s project , Duk e Energ y ha s conducte dvariou s studies , perfonne devaluations , an dsubmitte d variou s draf

t an dfinal reports . On e ofth e require dreport s wa s th e "draf t 316(b ) resourc e assessmen t

repor t for th e Mos s Landin g powe r plant" , date dJanuar y 1 , 2000 . Copie s o f tha t draf t repor t wer e als o submitte dto member s ofth e Technica l Workin g Grou p establishe dunde r you r Board' s purvie w for

thi s projec t

(includin g othe r

stat e agencies , you r

Board' s consultants , an d th e Califomi aEnerg y Commission' s (CEC ) consultant) , an dstaf f o f th e CEC . Th e draf

t repor t an dsubsequen t

revision s hav e bee n reviewe db y th e above liste drecipients , an ddiscusse da t a numbe r o f Technica l Workin g Grou p meetings . I n orde r t o proces s an danalyz e th e full year' s data , an drevie w th e report , th e Marc h 1 , 200 0 du e dat e fo r th e fina l 316(b ) Demonstratio n repor t wa s extende dt o Apri l 17 , 2000 . Th e repor t wa s complete dahea do f

schedul e an ddistribute do n Apri l 4 , 200 0 to member s ofth e Technica l Workin g Group . A t

th e las t meetin g o n Apri l 12 , 200 0 i t was determine dtha t

with th e incorporatio n o f

afew change s discusse da t that meeting , th e repor t

woul db e read y for submittal .

<"V e ».W/o t

S^or. - T„,., 0 , Ci"* o IDRf l - rr. (:--,_,„, c ._ , ^-.i;f„.,., , Qjins.-i' a-£iz^ C TC_17.4_ 1 C» Y M , c v ^IP..*"! 1 *P. 4

Th e repor t ha s subsequentl y bee n prepared . Pleas e find enclose dsi x copie s o f "Mos s Landin g Powe r Plant Modernizatio n Project , 316(b ) Resourc e Assessment . Apri l 28 , 2C00. " I f yo u wis h to discus s an y matter s relate dto thi s repon , pleas e don' t hesitat e to cal l Wayn e Hoffma n a t (510 ) 251-680 1 o r

m e a t (415 ) 53 6 3542 . Sincerel y yours ,
Davi dL . Maye r Presiden t TENER A Environmenta l LL C cc : Mr . Michae l Thomas , CCRWQC B (vi alette r t o R . Briggs ) Mr . Bra dHagemann , CCRWQC B (vi alette r t o R . Briggs ) Dr . Gre g Cailliet , MLM L Dr . Pet e Raimondi , UCS C Dr . Mik e Foster , MLM L Ms . Debora h Johnston , CDF& G Mr . Dic k Anderson , CE C (vi aCE C Docke t distribution ) Mr . Jo e O'Hagan , CE C (vi aCE C Docke t distribution ) Mr . Michae l Bowen , CC C Mr . Joh n Dixon , CC C Dr . Jef f Paduan , Nava l Postgraduat e Schoo l Mr . Wayn e Hoffman , Duk e Energ y Ms . Caro l Raifsnider , Tener aEnerg y Mr . Le e Genz , MLP P Mr . Wayn e Hoffma

n Mr . Brian Waters . Duk e Energ yP. 5



# Mos s Landin g Powe r Plan t Modernizatio n Projec t 316(b ) Resourc e Assessmen t

April 28, 2000 Prepared

for: 

## ©Duk e Energ y Mos s Landing , LL C 65 5 3 r d Stree t P.M.B . 4 9 Oakland , C A 9460 7



### TENER A & iro n menta l On e Market , Spea rTower , Suit e 1850 , Sa n Francisco , C A 9410 5

(415 ) 536-4744 , FAX (415 ) 536-471 4 3427- A Miguelit o Court , San Lui s Obispo , Californi a 9340 1 (805 ) 541-0310 , FAX : (805 ) 541-042 1P. 6 

# TABL E O F CONTENT S
EXECUTIV E SUMMAR Y ES- 1 1. 0 INTRODUCTIO

N 1- 1 1. 1 Developmen t

o f th e 316(b ) Study Plan s , 1- 2 1. 2 Overvie w ofth e 316(b ) Progra m1- 3 1.2. 1 Targe t

Organisms Selecte dfp

r Stud y 1- 3 1. 3 Organizatio n ofth e Report 1- 4 2. 0 DESCRIPTIO N O F TH E MOS S LANDIN G POWE RPLAN T AN D CHARACTERISTIC S O F TH E

SOURC E WATE RBOD Y 2- 1 2. 1 Th e Plan t

an dit s Coolin g System s 2- 1 2.1. 1 Plan t

Coolin g Wate r

Syste mDescriptio n an dOperatio n 2- 4 2. 2 Aquati c Biologica l Resource s in th e Vicinit y o f MLP P 2-1 2 2.2. 1 Elkhor n Slough/Mos s Landin g Harbo r 2-1 2 2.2. 2 Montere y Ba y 2-1 5 3. 0 ENTRAINMEN T STUD Y AN D ASSESSMEN T METHOD S 3- 1 3. 1 Entrainmen t

Stud y 3- 2 3.1. 1 Entrainmen t

Samplin g Method s 3- 2 3.1. 2 Entrainmen t

Samplin g Frequenc y Rational e 3- 4 3. 2 Sourc e Wate r

Stud y 3- 4 3.2. 1 Sourc e Wate r

Samplin g Method s 3- 4 3.2. 2 Comparabilit y o f

Surfac e an dObliqu e Towe dMethodologie s 3- 6 3. 3 Laborator y Processin g an dDat aHandlin g 3- 7 3. 4 Samplin g Sufficienc y 3- 8 3. 5 Assessmen t

Method s 3- 8 3.5. 1 Demographi c Approache s 3- 9 3.5. 2 Empirica l Transpor t Mode l {ETM) 3-1 6 4. 0 ENTRAINMEN T AN D SOURC E WATE RRESULT S 4- 1 4. 1 Entrainmen t

Stud y Result s 4- 1 4.1. 1 Samplin g an dLaborator y Processin g Sufficienc y 4-1 3 4.1. 2 Day-Nigh t

Compariso n 4-1 7 4. 2 Sourc e Wate r

Stud y Result s 4-2 1 4. 3 Gobiidae : Introductio n 4-2 9 4.3. 1 Unidentifie dGobie s 4-3 0 4.3. 2 Unidentifie dgob y result s (53. 2 percent ) 4-3 5 4. 4 Bay Gob y : 4-3 8 4.4. 1 Bay gob y result s (30. 4 percent ) 4-3 8 4. 5 BlackeyeGob y 4-4 4 4.5. 1 Blackey e gob y result s (3. 0 percent ) 4-5 0 4. 6 Pacifi c Staghor n Sculpi n 4-5 2 4.6. 1 Pacifi c staghor n sculpi n result s (2. 2 percent ) 4-5 6 E9-05 3 9 i MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P. 7 Tabl e o f Contents 4. 7 Whit e Croake r

4-5 8 4.7. 1 Whit e Croake r

Result s (2. 1 percent ) 4-6 2 4. 8 Blenniidae : Combtoot h blennie s 4-62 4.8. 1 Hypsoblennius Sp p 4-6 2 4.8. 2 Blennie s Hypsoblennius spp . Result s (1. 9 percent ) 4-6 5 4. 9 Longja w Mudsucke r 4-6 8 4.9. 1 Longja w Mudsucke r Gillichthys mirabilis Result s (1. 2 percent ) 4-7 1 4.1 0 Pacifi c Herrin g 4-7 7 4.10. 1 Pacifi c herrin g Clupea pallasi result s (0. 9 percent ) 4-8 1 4.1 1 Roc k

Crab s Famil y Cancrida e 4-8 4 4.1 2 Hairy Roc k

Crab Cancer

jordani 4-8 9 4.12. 1 Hairy Roc k

Crab Result s (29. 3 percent ) 4-9 0 4.1 3 Yello w Roc k

Crab Cancer

anthonyi 4-9 4 4.13. 1 Yello w Roc k

Cra b result s (19. 6 percent ) 4-9 6 4.1 4 Brow n Roc k

Crab Cancer

antennarius 4-9 9 4.14. 1 Brow n Roc k

Crab Result s (19. 0 percent ) , 4-10 0 4.1 5 Dungenes s Cra b Cancer magister 4-10 4 4.15. 1 Dungenes s Crab Result s (14. 7 percent ) 4-10 8 4.1 6 Re dRoc k

Crab Cancer

productus 4-10 9 4.16. 1 Re dRoc k

Cra b Result s (9. 8 percent ) 4-11 0 4.1 7 Slende r

Roc k Crab Cancer

gracilis 4-11 3 4.17. 1 Slende r

Roc k Crab Result s (7. 1 percent ) 4-11 4 4.1 8 Europea n Gree n Crab Carcinus maenas 4-11 8 4.18. 1 Europea n Gree n Crab Carcinus maenas Result s 4-12 1 5. 0 IMPINGEMEN T EFFECT S 5- 1 5. 1 Impingemen t

Stud y 5- 2 5.1. 1 Method s 5- 2 5. 2 Lif e Historie s o f

Abundantl y Impinge dFishe s 5- 4 5.2. 1 Fishe s 5- 4 5.2. 2 Macroinvertebrate s 5-1 2 5. 3 Impingemen t

Effect s 5-2 0 5. 4 Rat e o f

Impingemen t

an dIntak e Velocitie s 5-2 9 5.4. 1 Impingemen t

Surviva l an dIntak e Velocitie s 5-3 1 5. 5 Conclusion s 5-3 2 6. 0 COOLIN G WATE RSYSTE M IMPAC T ASSESSMEN T 6- 1 6. 1 Entrainmen t

Effect s Assessmen t

6- 2 6. 2 Unidentifie dGobie s 6- 4 6. 3 Ba y Gob y 6- 8 6. 4 Blackey e Gob y 6-1 1 6. 5 Longja w Mudsucke r 6-1 5 6. 6 Combtoot h Blenn y 6-1 8 6. 7 Pacifi c Herrin g 6-2 2 6. 8 Whit e Croake r

6-2 5 E9-053. 9 i i MLP P 316(b ) Resource Assessmen t 4-28-200 0P. 8
Tabl e o f Content s 6. 9 Pacifi c Staghorn Sculpi n 6-2 8 6.1 0 Hair y Roc k Crab 6-3 0 6.1 1 Yello w Roc k

Crab 6-3 2 6.1 2 Brow n Roc k

Crab 6-3 4 6.1 3 Dungenes s Crab 6-3 6 6.1 4 Re dRoc k

Crab 6-3 7 6.1 5 Slende r

Roc k Crab 6-3 9 6.1 6 Summary o f

Entrainmen t

Effect s 6-4 1 6.1 7 Impingemen t

Effect s Assessmen t

6-4 6 7. 0 EVALUATIO N O F ALTERNATIV E INTAK E TECHNOLOGIE S 7- 1 7. 1 First-leve l Evaluatio n —Ar e th e Technologie s Prove n an dAvailable ? 7- 2 7.1. 1 Behaviora l Barrier s 7- 4 7.1. 2 Diversio n System s 7- 4 7.1. 3 Physica l Barrier s 7- 4 7. 2 Second-Leve l Evaluatio n —Wil l Th e Technolog y Resul t In Biologica l Benefits ? 7- 6 7.2. 1 Closed-Cycl e Coolin g Wate r Syste m7- 6 7.2. 2 Intak e Locatio n 7- 7 7.2. 3 Behaviora l Barrier s 7-1 0 7.2. 4 Physica l Barrier s 7-1 1 7.2. 5 Fis h Collection , Removal , an dConveyanc e System s 7-1 3 7.2. 6 Intak e Maintenanc e An dOperationa l Modification s 7-1 5 7.2. 7 Conclusion : Biologica l Evaluatio n 7-1 9 7. 3 Third-Leve l Evaluatio n —Feasibilit y An dCos t Analysi s 7-2 0 7.3. 1 Seasona l Curtailmen t 7-2 0 7.3. 2 Closed-Cycl e Coolin g System s 7-2 3 7.3. 3 Modifie dVertica l Travelin g Scree n an dFis h Retur n Syste mfo r th e Ne w C C Unit s Intak e 7-3 0 7.3. 4 Reduction s i n Circulatin g Wate r Pum p Operatio n 7-3 3 7.3. 5 Dredgin g th e Intak e Are a7-3 5 7.3. 6 Alternativ e Biofoulin g Treatmen t Scheme s 7-3 5 7. 4 Summar y an dConclusion s 7-3 6 7.4. 1 Discussio n 7-3 7 7.4. 2 Conclusions.. . 7-3 9 8. 0 REFERENCE S 8- 1



# LIS T O F APPENDICE S Appendi x A . Estimatin g Tota l Annua l Entrainment . Appendi x B . Derivatio n ofth e Varianc e an dEstimate dVarianc e o f Appendi x C . Estimatin g Proportiona l Entrainmen t an dth e ETM

Calculations . Appendi x D . Delt aMetho dfor Calculatin g Variance .

E9-053. 9 ii i MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P. 9 Tabl e o f Contents 

# LIS T O F TABLE S Tabl e 2-1 . Histori c an dProjecte dSpecification s ofth e Coolin g Wate r Intak e Structure s a t MLPP , Unit s 1 throug h 5 an dth e Ne w Combined-cycl e Unit s 2- 3 Tabl e 3-1 . Commo n Entrainmen t Perio dan dPea

k Concentration s for

th e Eigh t Mos t Abundantl y Entraine dLarva l Fis h Tax aa t MLP P durin g 1978-198 0 (PG&E , 1983 ) 3- 4 Tabl e 3-2 . Collectio n Specification s fo r Sourc e Wate r

Samplin g at

MLP P 3- 6 Tabl e 3-3 . Dat aRequirement s an dOutput s for Thre e Approache s Propose dt o Estimat e Effect s o f Coolin g Wate r

Withdrawal s a

t MLP P 3-1 1 Tabl e 3-4 . Advantage s an dDisadvantage s ofth e Thre e Approache s Propose dt o Estimat e Effect s i n th e MLP P 316(b ) Assessmen t 3-1 2 Tabl e 4-1 . Mean Concentration s (#/1,00 0 m 3 ) o f al l Larval Fis h Tax aan dMegalop s Selecte d Crab s Collecte din front

ofth e MLP P Intakes : Marc h 2 , 199 9 - Februar y 24 , 200 0 4- 4 Tabl e 4-2 . Specie s foun dt o b e Uniqu e t o eithe r th e Ne w Combined-cycl e Unit s o r th e Unit s 6 an d7 Intake s 4-1 3 Tabl e 4-3 . Result s o f

T-test s Comparin g Larva l Fis h Concentration s at th e Ne w Combined cycl e Unit s an dth e Unit s 6 an d7 Intake s 4-1 4 Tabl e 4-4 . Sampl e Collectio n Time s b y Cycle , Dat e an dSourc e Wate r Stations , Harbo r

Mout h (HM ) an dHarbo r

Bridg e (HB ) 4-1 9 Tabl e 4-5 . Rati o o f

Daytim e an dNighttim e Concentration s o f Larva l Unidentifie dGob y Taxa , Ba y Goby , an dPacifi c Staghorn Sculpi n Collecte dth e Harbo r Mouth (HM ) Statio n t o Ne w C C Unit s Intak e Statio n Entrainmen t Concentration s 4-1 9 Tabl e 4-6 . Rati o O f

Daytim e an dNighttim e Concentration s o f Larva l Unidentifie dGob y Taxa , Ba y Goby , an dPacifi c Staghor n Sculpi n Collecte dth e Harbo r Bridg e (HB ) Statio n t o Ne w C C Unit s Intak e Statio n Entrainmen t Concentration s 4-2 0 Tabl e 4-7 . Mea n Concentration s (#/1,00 0 m 3 ) o f al l Larva l Fis h Taxa , Cancer spp . Megalops , an dEuropea n Gree n Cra b Megalop s Collecte di n th e Sourc e Wate r i n th e Vicinit y o f th e MLPP : Jun e 199 9 - Februar y 200 0 4-2 5 Tabl e 5-1 . Estimate dConcentration s Base do n Survey s take n fromJanuar y 1 , 197 9 - Marc h 31 , 198 0 5-2 8 Tabl e 5-2 . Existin g an dProjecte dApproac h an dThrough-Scree n Velocitie s for th e Pittsbur g Powe r Plant s Unit s 1 throug h 4 an dUnit s 5 an d6 Intake s 5-3 0 Tabl e 5-3 . Impingemen t

o f Stripe dBas s a

t Variou s Approac h Velocitie s 5-3 0 Tabl e 5-4 . Surviva l (% ) o f Stripe dBas s Impinge dFou r Minute s at

Variou s Wate r

Velocitie s 5-3 1 Tabl e 6-1 . Fina l ET M Outpu t Unidentifie dGobie s Gobiidae sp p 6- 6 Tabl e 6-2 . Annua l Entrainmen t an dFH Estimate s for

Unidentifie dGobie s Gobiidae spp. : Marc h 1 , 199 9 - Februar y 29 , 200 0 6- 7 Tabl e 6-3 . Fina l ETM

Outpu t Ba y Gob y Lepidogobius lepidus 6- 9 Tabl e 6-4 . Annua l Entrainmen t an dAEL Estimate s for

Ba y Gob y Lepidigobius lepidus: Marc h 1 , 199 9 - Februar y 29 , 200 0 6-1 0 E9-053. 9 i vMLP P 316(b ) Resource Assessmen t 4-28-200 0P.1 0 Tabl e o f Content s Tabl e 6-5 . Fina l ETM

Outpu t for Blackey e Gob y Coryphopterus nicholsi 6-1 2 Tabl e 6-6 . Annua l Entrainmen t an dFH Estimate s for

Blackey e Gob y Coryphopterus nicholsi: Marc h 1 , 199 9 - Februar y 29 , 200 0 6-1 3 Tabl e 6-7 . Annua l Entrainmen t an dAEL Estimate s for

Blackey e Gob y Coryphopterus nicholsi: Marc h 1 , 199 9 - February 29 , 200 0 6-1 4 Tabl e 6-8 . Fina l ETM

Outpu t for Longja w Mudsucke r

Gillichthys mirabilis 6-1 6 Tabl e 6-9 . Annua l Entrainmen t an dFH Estimate s for

Longja w Mudsucke r

Gillichthys mirabilis: Marc h 1 , 199 9 - Februar y 29 , 200 0 6-1 7 Tabl e 6-10 . Fina l ETM

Outpu t for Unidentifie dBlennie s Hypsoblennius sp p 6-1 9 Tabl e 6-11 . Annua l Entrainmen t an dFH Estimate s for

Unidentifie dBlennie s Hypsoblennius spp. : Marc h 1 , 199 9 - Februar y 29 , 200 0 6-2 0 Tabl e 6-12 . Annua l Entrainmen t an dAEL Estimate s for

Unidentifie dBlennie s Hypsoblennius spp. : Marc h 1 , 199 9 - February 29 , 200 0 6-2 1 Tabl e 6-13 . Fina l ETM

Outpu t for Pacifi c Herrin g Clupea pallasi 6-2 3 Tabl e 6-14 . Annua l Entrainmen t an dFH Estimate s for

Pacifi c Herrin g Clupea pallasi: Marc h 1 , 199 9 - February 29 , 200 0 6-2 4 Tabl e 6-15 . Annua l Entrainmen t an dAEL Estimate s for

Pacifi c Herrin g Clupea pallasi: March , 1 , 199 9 - February 29 , 200 0 6-2 5 Tabl e 6-16 . Fina l ETM

Outpu t for Whit e Croake r

Genyonemus lineatus 6-2 6 Tabl e 6-17 . Annua l Entrainmen t an dFH Estimate s fo r

Whit e Croake r

Genyonemus lineatus: Marc h 1 , 199 9 - Februar y 29 , 200 0 6-2 8 Tabl e 6-18 . Fina l ETM

Outpu t for Pacifi c Staghorn Sculpi n Leptooottus armatus 6-2 9 Tabl e 6-19 . Fina l ETM

Outpu t for Hair y Roc k

Crab 6-3 1 Tabl e 6-20 . Annua l Entrainmen t an dFH Estimate s for

Hairy Roc k

Crab : Marc h 1 , 199 9 - Februar y 29 , 200 0 6-3 2 Tabl e 6-21 . Fina l ETM

Outpu t for Yello w Roc k

Crab 6-3 3 Tabl e 6-22 . Annua l Entrainmen t an dFH Estimate s fo r

Yello w Roc k

Crab : Marc h 1 , 199 9 - Februar y 29 , 200 0 6-3 4 Tabl e 6-23 . Fina l ETM

Outpu t for Brow n Roc k

Crab 6-3 5 Tabl e 6-24 . Annua l Entrainmen t an dFH Estimate s for

Brow n Roc k

Crab : Marc h 1 , 199 9 - Februar y 29 , 200 0 6-3 6 Tabl e 6-25 . Annua l Entrainmen t an dFH Estimate s for

Dungenes s Crab : Marc h 1 , 199 9 - Februar y 29 , 200 0 6-3 7 Tabl e 6-26 . Fina l ETM

Outpu t for Re dRoc k

Cra b 6-3 8 Tabl e 6-27 . Annua l Entrainmen t an dFH Estimate s for

Re dRoc k

Crab : Marc h 1 , 199 9 - Februar y 29 , 200 0 6-3 9 Tabl e 6-28 . Fina l ETM

Outpu t fo r Slende r Roc k Crab 6-4 0 Tabl e 6-2 9 Annua l Entrainmen t an dFH Estimate s for

Slende r Roc k Crab : Marc h 1 , 199 9 - Februar y 29 , 200 0 6-4 1 E9-053. 9 vMLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.1 1 Tabl e o f Content s Tabl e 6-30 . Summar

y o f Estimate dMLP

P Ne w Combined-cycle Entrainmen t Effects fo r Abundan t Fishe s an dCance r Crab s Basedo

n ETM, FH, an

dAEL Model s (Marc h 1999-Februar

y 2000 ) 6-4 4 Tabl e 7-1 . Operationa

l Feasibilit y of Intak e Technologie s an

dOperationa

l Alternative s Considere dfo

r th e ProposedMLP

P Combined-cycle Unit s 7- 3 Tabl e 7-2 . Estimate dCos t

o f Replacemen

t Energy during two Period s o f Operatio n Curtailmen

t fo r th e Mos s Landin g Combined-cycl e Unit s 7-2 3

E9-053. 9 v i MLP P 316(b ) Resource Assessmen t 4-28-200 0P.1 2 r , . 

# I Tabl e o f Content s 

# LIS T O F FIGURE S Figur e 2-1 . Th e locatio n ofth e Mos s Landin g Powe r Plan t 2- 2 Figur e 2-2 . Existin g MLP P Unit s 1 throug h 5 coolin g wate r intak e structur e 2- 5 Figur e 2-3 . Propose dmodernize dMLP P combined-cycl e coolin g wate r intak e structur e 2- 6 Figur e 2-4 . Sectiona l vie w ofth e MLP P ne w combined-cycl e unit s intak e structure' s travelin g screen s 2- 7 Figur e 2-5 . MLP P Unit s 6 an d7 coolin g wate r intak e structur e 2- 9 Figur e 2-6 . Locatio n ofth e MLP P Unit s 6 an d7 discharg e structur e 2-1 0 Figur e 3-1 . Mos s Landin g Powe r Plan t samplin g location s 3- 3 Figur e 3-2 . Locatio n o f

Montere y Ba y nearshor e MLP P ocea n sourc e water , Mos s Landin g Harbor , an dElkhorn Sloug h area s use din calculatin g sourc e wate r an dreceivin g wate r volume s 3-2 0 Figur e 4-1 . Percen t

compositio n ofth e mos t abundan t larva l fish tax aan dCancer spp . megalop s collecte din entrainmen t survey s a

t th e MLPP : Marc h 199 9 - Februar y 200 0 4- 4 Figur e 4-2 . Mean , maximu man dminimu mcumulativ e number s o f specie s fro m1,000 iterations o f

dat acollecte dove r

4 2 survey s at

th e ne w combined-cycl e unit s intak e 4-1 6 Figur e 4-3 . Mean , maximu man dminimu mcumulativ e number s o f specie s fro m1,00 0 iterations o f

dat acollecte dove r

4 2 survey s a

t th e Unit s 6 an d7 intak e 4-1 6 Figur e 4-4 . Percen t

compositio n ofth e mos t abundan t larva l fish tax acollecte di n sourc e wate r survey s a t Elkhor n Slough , Mos s Landin g Harbor , an dOcea n areas : Jun e 199 9 - Februar y 200 0 4-2 2 Figur e 4-5 . Percen t

compositio n ofth e mos t abundan t megalopa l cance r

cra b tax acollecte di n sourc e wate r

survey s at

Elkhor n Slough , Mos s Landin g Harbor , an dOcea n Areas : Jun e 199 9 - Februar y 200 0 4-2 4 Figur e 4-6 . Mea n surve y concentration s (#/l,00 0 m 3 ) o f larva l unidentifie dgobie s a t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-3 2 Figur e 4-7 . Concentration s (#/l,00 0 m 3 ) o f larva l unidentifie dgobie s at th e ne w combined cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-3 2 Figur e 4-8 . Sourc e wate r concentration s (#/l,00 0 m 3 ) o f larva l unidentifie dgobie s a t si x station s nea r

MLPP : Jun e 199 9 - Februar y 200 0 4-3 3 Figur e 4-9 . Mea n surve y concentration s (#/1,00 0 m 3 ) o f larva l ba y gob y a t

th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-3 8 Figur e 4-10 . Concentration s (#/1,00 0 m 3 ) o f larva l ba y gob y at

th e ne w combined-cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-3 9 Figur e 4-11 . Sourc e wate r concentration s (#/1,00 0 m 3 ) o f larva l ba y gob y a t

si x station s nea r MLPP : Jun e 199 9 - Februar y 200 0 4-4 0 Figur e 4-12 . Length frequenc y o f al l larva l ba y gob y Lepidogobius lepidus length s measure d b y sourc e wate r

an dintak e samplin g location s (Jun e 199 9 - Januar y 2000 ) 4-4 1 E9-053. 9 vi i MLP P 316(b ) Resource Assessmen t 4-28-200 0P.1 3 Tabl e o f Contents Figur e 4-13 . Length frequenc y o f al l larva l ba y gob y Lepidogobius lepidus measure db y hig h an dlo w tid e stag e (Jun e 199 9 - Januar y 2000 ) 4-4 2 Figur e 4-14 . Scattergra mplo t o f al l larva l ba y gob y Lepidogobius lepidus length s measure db y sourc e wate r

surve y dat e (Jun e 199 9 - Januar y 2000 ) 4-4 3 Figur e 4-15 . Mea n surve y concentration s (#/1,00 0 m 3 ) o f larva l blackey e gob y a

t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-4 7 Figur e 4-16 . Concentration s (#/1,00 0 m 3 ) o f larva l blackey e gob y at

th e ne w combined-cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-4 8 Figur e 4-17 . Sourc e wate r concentration s (#/ l ,00 0 m 3 ) o f larva l blackey e gob y at

si x station s near MLPP : Jun e 199 9 - Februar y 200 0 4-4 9 Figur e 4-18 . Pacifi c staghor n sculpi n Californi astate-wid e landings : 1987 - 199 8 4-5 2 Figur e 4-19 . Mean surve y concentration s (#/l,00 0 m 3 ) o f larva l Pacifi c staghor n sculpi n a t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-5 3 Figur e 4-20 . Concentration s {fill ,00 0 m 3 ) o f

larva l Pacifi c staghor n sculpi n at th e ne w combined-cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-5 4 Figur e 4-21 . Sourc e wate r concentration s {Ull

,00 0 m 3 ) o f

larva l Pacifi c staghor n sculpi n at si x station s near

MLPP : Jun e 199 9 - Februar y 200 0 4-5 5 Figur e 4-22 . Whit e croake r landing s an dvalue s Californi astate-wide , Montere y area , an dMos s Landin g Harbo r

landings : 198 7 t o 199 8 4-5 8 Figur e 4-23 . Mean surve y concentration s (#/ l ,00 0 m 3 ) o f larva l whit e croake r

a t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-5 9 Figur e 4-24 . Concentration s (#/l,00 0 m 3 ) o f larva l whit e croake r

at th e ne w combined-cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-6 0 Figur e 4-25 . Sourc e wate r concentration s {Ull

,00 0 m 3 ) o f

larva l whit e croake r

a t si x station s nea r MLPP : Jun e 199 9 - Februar y 200 0 4-6 1 Figur e 4-26 . Mea n surve y concentration s {Ul 1,000 m 3 ) o f larva l Hypsoblennius spp . a t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-6 5 Figur e 4-27 . Concentration s (#/l,00 0 m 3 ) larva l Hypsoblennius spp . a t th e ne w combined-cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-6 6 Figur e 4-28 . Sourc e wate r concentration s (#/1,00 0 m 3 ) o f larva l Hypsoblennius spp . a t si x station s nea r

MLPP : Jun e 1999-Februar y 200 0 4-6 7 Figur e 4-29 . Mea n surve y concentration s (#/l,00 0 m 3 ) o f larva l longja w mudsucke r a t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-7 1 Figur e 4-30 . Concentration s (#/ l ,00 0 m 3 ) o f larva l longja w mudsucke r at th e ne w combined cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-7 2 Figur e 4-31 . Sourc e wate r concentration s {Ull

,00 0 m 3 ) o f

larva l longja w mudsucke r a t si x station s nea r

MLPP : Jun e 199 9 - Februar y 200 0 4-7 3 Figur e 4-32 . Length frequenc y o f al l larva l longja w mudsucker s Gillichthys mirabilis measure d b y sourc e wate r

an dintak e samplin g location s (Jun e 199 9 - Januar y 2000 ) 4-7 4
E9-053. 9 vii i MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P. M Tabl e o f Content s Figur e 4-33 . Length frequenc y o f al l larval longja w mudsucker s Gillichthys mirabilis measure d b y hig h an dlo w tid e stag e (Jun e 199 9 - Januar y 2000 ) 4-7 5 Figur e 4-34 . Scattergra mplo t o f larva l longja w mudsucker s Gillichthys mirabilis length s measure db y sourc e wate r surve y dat e (Jun e 199 9 - Januar y 2000 ) 4-7 6 Figur e 4-35 . Pacifi c herring , sac-ro e an droe-on-kel p Californi astate-wid e landings : 198 7 -

199 8 4-8 0 Figur e 4-36 . Mea n surve y concentration s (#/l,00 0 m 3 ) o f larval Pacifi c herrin g at

th e Mos s Landin g Powe r

Plan t ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-8 1 Figur e 4-37 . Concentration s (#/l,00 0 m 3 ) o f larva l Pacifi c herrin g at

th e ne w combined-cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-8 2 Figur e 4-38 . Sourc e wate r concentration s {Ull

,00 0 m 3 ) o f

larval Pacifi c herrin g a

t si x station s nea r MLPP : Jun e 199 9 - February 200 0 4-8 3 Figur e 4-39 . Califomi astate-wid e (197 9 -1998 ) an dPort s o f Montere y Bay (198 6 - 1998 ) landing s o f

roc k crab s 4-8 7 Figur e 4-40 . Mea n surve y concentration s (#/1,00 0 m 3 ) o f hairy roc k

crab megalop s a

t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-9 1 Figur e 4-41 . Concentration s {Ull ,00 0 m 3 ) o f

hairy roc k

roc k megalop s a

t th e ne w combined cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-9 2 Figur e 4-42 . Sourc e wate r concentration s (#/ l ,00 0 m 3 ) o f hairy roc k

cra b megalop s a t

si x station s nea r

MLPP : Jun e 199 9 - Februar y 200 0 4-9 3 Figur e 4-43 . Mean surve y concentration s {Ul 1,00 0 m 3 ) o f yello w roc k

crab megalop s at

th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-9 6 Figur e 4-44 . Concentration s (#/l,00 0 m 3 ) o f yello w roc k

crab megalop s a t

th e ne w combined cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-9 7 Figur e 4-45 . Sourc e wate r concentration s (#/l,00 0 m 3 ) o f yello w roc k

crab megalop s at

si x station s nea r

MLPP : Jun e 199 9 - Februar y 200 0 4-9 8 Figur e 4-46 . Mea n surve y concentration s {Ul 1,00 0 m 3 ) o f brow n roc k

cra b megalop s a t

th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-10 1 Figur e 4-47 . Concentration s {Ul 1,000 m 3 ) o f

brow n roc k

roc k megalop s at

th e ne w combined cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-10 2 Figur e 4-48 . Sourc e wate r concentration s (#/l,00 0 m 3 ) o f brow n roc k

crab megalop s at

si x station s nea r

MLPP : Jun e 199 9 - Februar y 200 0 : 4-10 3 Figur e 4-49 . Dungenes s crab landing s an dvalu e o f landing s from198 7 - 199 8 fo r Montere y Ba y port s an dth e port

o f Mos s Landin g 4-10 7 Figur e 4-50 . Mea n surve y concentration s (#/l,00 0 m 3 ) o f dungenes s crab megalop s a t th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-10 8 Figur e 4-51 . Mea n surve y concentration s (#/1,00 0 m 3 ) o f re droc k crab megalop s at

th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-11 1 Figur e 4-52 . Concentration s (#/l,00 0 m 3 ) o f re droc k roc k megalop s at

th e ne w combined-cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-11 2
E9-053. 9 i x MLP P 316(b ) Resource Assessmen t 4-28-200 0P.1 5
Tabl e o f Content s Figur e 4-53 . Mea n surve y concentration s (#/l,00 0 m 3 ) o f slende r roc k crab megalop s at

th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-11 5 Figur e 4-54 . Concentration s (#/l,00 0 m 3 ) o f slende r roc k crab megalop s at

th e ne w combined cycl e unit s intak e separate db y sampl e collectio n time : Jun e 199 9 - Februar y 200 0 4-11 6 Figur e 4-55 . Sourc e wate r concentration s {#11 ,000 m 3 ) o f slende r roc k crab megalop s at

si x station s near

MLPP : Jun e 199 9 - February 200 0 4-11 7 Figur e 4-56 . Mean surve y concentration s (#/l,00 0 m 3 ) o f Europea n gree n cra b megalop s at th e MLP P ne w combined-cycl e unit s intake : Marc h 199 9 - Februar y 200 0 4-12 1 Figur e 4-57 . Sourc e wate r concentration s (#/l,00 0 m 3 ) o f Europea n gree n crab megalop s at si x station s near

MLPP : Jun e 199 9 - Februar y 200 0 4-12 2 Figur e 5-1 . Bocacci o landing s fromMontere y Bay port s 5-1 1 Figur e 5-2 . Landing s o f

combine dmarke t

categor y for

bocaccio/chilipeppe r

5-1 1 Figur e 5-3 . Bocacci o landing s fro mCaliforni a5-1 2 Figur e 5-4 . Reporte dcommercia l ba y shrimp landing s i

n Sa n Francisco , Monterey , an dMos s Landin g area s from198 6 t o 199 8 5-1 6 Figur e 5-5 . Commercia l marke t squi dlanding s reporte dfo r Californi aan dMontere y Are a5-2 0 Figur e 5-6 . Mea n length o f bocacci o collecte di

n impingemen t

sample s a

t th e Mos s MLP P intake s (PG&E , 1983 ) ...5-2 2 Figur e 5-7 . Numbe r

measure dvs . tota l numbe r o f bocacci o collecte din impingemen t sample s a t th e MLP P intake s (PG&E , 1983 ) 5-2 3 Figur e 5-8 . Mea n monthl y concentration s ofth e mos t abundantl y impinge dfishes a t th e MLP P intake s (PG&E , 1983 ) 5-2 4 Figur e 5-9 . Mea n monthl y combine dconcentration s ofth e mos t abundantl y impinge dfishes a t th e MLP P Unit s intake s (PG&E , 1983 ) 5-2 6 Figur e 5-10 . Mea n monthl y concentration s ofth e mos t abundantl y impinge dCancer spp . crab s a t th e MLP P intake s (PG&E , 1983 ) 5-2 7 Figur e 7-1 . MLP P alternativ e closed-cycl e coolin g mechanica l draf t coolin g towe r

locatio n 7-2 5 Figur e 7-2 . MLP P alternativ e closed-cycl e coolin g natura l draf t coolin g towe r

locatio n 7-2 7 Figur e 7-3 . MLP P alternativ e closed-cycl e coolin g air-coole dcondenser s locatio n 7-2 9 Figur e 7-4 . Travelin g Wate r Scree n Proposa l Numbe r 1 7-3 2 Figur e 7-5 . Travelin g Wate r Scree n Proposa l Numbe r 1 (overhea dview ) 7-3 2

E9-053. 9 x MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.1 6 

# 1 1 I
H



# I EXECUTIV E SUMMAR Y

Th e purpos e o f

thi s repor t

i s t o evaluat e alternativ e intak e technologie s fo r th e possibilit y o f cost-effectivel y lowerin g potentia l effect s ofth e Mos s Landin g Powe r Plant' s ne w combined cycl e (CC ) unit s coolin g wate r intak e structur e (CWIS) . Th e ne w CWI S ha s bee n redesigne dt o reduc e impingement

effect s ofth e existin g Unit s 1 throug h 5 intak e structur e b y lowerin g approac h velocities , b y installin g modernized , angle drotatin g fish screens , an db y removin g a forebay tunne l that

previou s t o 1996 , trappe dfishes an dinvertebrates . Entrainmen t effect s ofth e existin g CWI S wil l b e significantl y an ddirectl y reduce db y th e ne w units ' 3 4 percen t reductio n in intak e coolin g wate r

flo w capacity . Thi s reductio n combine dwith th e result s ofth e 1999 - 200 0 entrainmen t

fieldsamplin g leads t o aprojectio n o f lo w entrainmen t

impacts . A n unidentifie dspecie s grou p o f gobie s account s for

5 3 percen t

o f al l th e larval fish that

wil l b e entraine db y th e ne w CWIS . Ou r analysi s o f

CWI S effect s o n thi s fish i s complete . Onl y 7 othe r tax a(specie s an dgrouping s o f species ) offis h combine dwith th e unidentifie dgob y mak e u p 9 5 percen t

o f al l th e entraine dnumbe r offis h larvae . Th e projecte dfractiona l losse s o f thes e specie s t o th e ne w CWI S an dcombine dMLP P entrainmen t ar e lo w du e t o thei r

sourc e wate r abundance . Th e CWI S withdraw s wate r fro masourc e o f

inherentl y lo w specie s diversity . Th e repor t

contain s th e complete dassessmen t o f alternativ e intak e technologies . Base don availabl e technologie s an dth e relativel y lo w entrainmen t an dimpingemen t

impact s projecte dfo

r th e ne w CWIS , th e redesigne dCWI S represent s bes t availabl e technolog y for th e site . Th e ne w travelin g screen s wil l lowe r scree n approac h velocitie s an doperat e t o mor e consistentl y remov e debris , reducin g impingemen t rate s tha t

ar e cause db y entanglement . Remainin g lo w potential effect s o r othe r uncertaintie s associate dwith projecte dCWI S effect s wil l b e addresse da s necessar y b y appropriat e measure s no w bein g discusse dwith regulator y an dresourc e agenc y representatives . Duk e ha s propose danumbe r o f environmenta l enhancemen t measure s t o addres s thes e uncertainties . Th e fiel dstudie s an ddat aanalyse s for th e propose dmodernizatio n projec t followe dth e 316(b ) Stud y Pla n develope di n coordinatio n wit h th e Technica l Workin g Grou p establishe dunde r th e auspice s ofth e Regiona l Wate r Qualit y Contro l Board . Finding s ofth e complete d316(b ) Demonstratio n resourc e assessmen t ar e presente dgraphicall y i n th e report , usin g th e result s o f ou r 1999-200 0 fieldstudies . Fro mthes e sit e survey s o f weekl y daytim e an dnighttim e entrainment , an dmonthl y sourc e wate r larva l fish concentrations , w e hav e foun dthat : o Onl y eigh t

tax ao f larva l fishe s mad e u p 9 5 percen t o f entraine dlarvae . Th e intak e locatio n i s i n an are atha t

ha s naturall y lo w diversity , typica l o f bay s an dsloughs , unlik e th e myria d o f specie s foun di n Montere y Bay' s marin e habitats , o Gobie s (Famil y Gobiidae ) comprise dth e overwhelmin g majority o f thi s 9 5 percent , E9-053. 9 ES- 1 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.1 7 Executiv e Summar

y



### • Thre e specie s of

fish (Pacifi c herring , whit

e croaker , an

dPacifi c staghor

n sculpin) , havin g som e commercia

l o r recreationa

l value , individually represente d5 percent ofth e eigh

t tax a o r species , • Th e proportiona

l entrainmen

t estimate s wer

e relatively low fo

r al l specie s analyzed ; below standar dfisher y managemen

t practice s fo

r sustainabl e harvest s of

atota l stock especially whe n reference dt

o tota l populations , • Thi s year' s entraine dlarva e ar e essentially the sam

e composition , abundance , an d distributio n of

las t year' s tax acollecte da

t the beginnin g of

ou r 12-mont h entrainmen

t study , an d

• Ou r result s ar e generally simila

r t o the previou s MLP

P 316(b ) Demonstration' s finding of lo w potentia l impact an dbes t availabl e intak

e technology . Cancer spp . megalop s concentration s collecte dfro mthe sam e survey s o

f weekl y daytim e an d nighttim e entrainment , an

dmonthl y sourc e wate

r hav e show

n that :

• Si x specie s o f

cance r cra b megalop s an

dunidentifie dcance

r megalop s wer

e collecte di

n entrainmen

t survey s a t the ne w CC unit s intake , • Fou r o f thes e cra b specie s (dungeness , brown rock , re drock , an dyello w rock

) hav e commercia

l importance , • The mos t

abundan t cance r cra b (hair y roc k crab ) collecte dha s n o commercia l value , • The proportiona

l entrainment

estimate s wer

e lo w fo r all specie s tha

t coul db e analyzed . However , the estimate s wer e typicall y base do

n asingl e surve

y P E value , an

d
• The numbe

r o f adul t crab s tha t migh t hav e resulte dfro

mth e entraine dmegalop s wa s low base don Fecundit

y Hindcas t

{FH) mode

l results .

i E9-053. 9 ES-2 MLP P 316(b ) Resource Assessmen t | • 4-28-200 0P.1 8 

# 1 1 1 1 I 1 B n 

# 1 Executiv e Summar v 

### A summar y ofth e estimate dentrainmen t effects fro mMarch 1999 through Februar y 200 0 ofth e new combined-cycl e unit s fo r th e mos t abundantly collecte dfishe s andcance r crab s i s presente d below . Thes e value s ar

e base don analyse s usin g the Empirica l Transpor t Model {ETM), andth e Fecundit y Hindcas t

{FH), andAdul

t Equivalen t Los s {AEL) models .

Unidentifie dgobie s Ba y gob y Blackey e gob y Longja w mudsucke r Hypsoblennius spp . Pacifi c herrin g Whit e croake r Pacifi c stagho m sculpi n Tota l Entrainmen t 2. 7 x 10 s 1.5xl0 8 1. 6 x IO7 8. 0 x IO 6 1.7 x 10 ' 4. 4 x IO 6 8. 6 x IO 6 « FH 

### 3oo;oo o » 1,82 5 49 7 9,08 6 23 5 27 0 » AEL

r 1,045,58 8 16,63 6 10,24 7 » 24 3 * * ETM 1 '* 0.02 6 0.03 9 0.04 3 0.05 2 0.11 1 0.12 9 0.01 6 0.03 6 ETM 01 * 0.10 7 0.2 1 0.07 5 0.08 9 0.18 2 0.13 4 0.12 9 0.11 8

Hair y roc k

cra b Yello w roc k

cra b Brow n roc k

cra b Dungenes s cra b Re droc k cra b Slende r roc k cra b Tota l Entrainmen t

1.7 x 10 6 0. 5 x IO 6 0. 8 x IO 6 0. 3 x IO 6 0. 2 x IO 6 1.7 x 107 FH

1,03 9 13 1 20 9 16 7 6 0 23 9 ETM 1 '* 0.01 8 * * * 0.04 1 0.02 5 ETM**

0.1 7 * 4 ft 0.04 1 0.07 9 'Unavailabl e informatio n o r valu e tha t

coul dno t

b e computed . (a ) ET M value s calculate dusin g sourc e wate r volume s 275 , 21 , an d 2. 2 m 3 x 10 6
. (b ) ET M value s calculate dusin g sourc e wate r volume s 21,21 , an d 2. 2 m 3 x 10 6
. 

# 1 1 1 1 I I Impingemen

t studie s reporte di

n the previou s 316(b ) Demonstratio n showe dthat : o Th e thre e mos t

abundantly impinge dfishe s (norther n arichovy , shine

r perch , andtopsmelt

) wer e impinge da

t higher rate s a t th e Unit s 1 through 5 intak e tha n a t th e Unit s 6 an

d7 intake , o Th e majorit

y o f Cancer spp . crab s an

d Crangon spp . shrimp s wer e impinge da

t highe r rate s a t th e Unit s 1 throug h 5 intak e tha n a t the Unit s 6 an

d7 intake , and o N o decline s i

n th e population s ofth e abov e liste dspecie s wer e foun dattributabl e t

o impingement . In additio n t o th e abov e findings , modification s mad e to th e Unit s 1 throug h 5 intak e structur e (shortenin g th e intak

e conduit , lowe

r approach velocities , an

d incline dtravelin g screens ) will
E9-053. 9 ES- 3 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.1 9 Executiv e Summar

y 

### reduc e previou s impingemen t rates . Alternativ e intak

e technologie s wer

e evaluate dfo

r us e i n the improvedCWI S base do n their :

• Prove n availability , • Potentia

l t o reduc e CWI S biologica

l effects an

dminimiz e population-leve l impacts , • Sit e feasibility , an

d
• Cost-effectivenes s performance . A stepwis e evaluatio n proces s of thes e factor s wa s employe dt o first determin e ase

t of intak e technologie s tha

t ar e availabl e an

dprove n fo r applicatio n a

t the C C site . A secondstag e analysi s ofth e availabl e an

dproven technologie s wa s performe dt o evaluat e the potentia

l effectivenes s o

f eac h alternativ e technolog y t

o reduc e biologica

l effects ofth e CWIS . The feasibilit y of intak e technologie s meetin g bot

h stag e on e an dstag e tw o evaluatio n criteri awer e analyze dan

d discusse di

n the report' s preliminar

y conclusion s on bes t

technolog y availabl e (BTA) fo r th e modernizatio n project' s CWIS . Th e combined-cycl e projec t

CWI S i s designe dt

o correc t th e entrapmen t effec t ofth e existin g CWI S by removin g th e 350-foo t shorelin e tunnel t

o the travelin g screens . Thi s modification , i n additio n to reducin g the ne w facility' s flo

w capacity , will significantly reduc e CC-CWI S impingemen t andentrainmen

t effects an dminimiz e the potentia l fo r impact s o n sourc e wate

r population s o f

fis h an dinvertebrates . The ne w powe r plant' s 3 4 percent

reductio n i

n intak e flow capacit

y fro mflow s i n th e 198 3 316(b ) demonstratio n studie s o f impingemen

t an dentrainmen

t effect s mak

e i t arelativel y straightforwar

dexercis e t

o projec t areductio n i

n effects wit

h the CC-CWIS . I

n additio n t

o thi s significan t reductio n i

n entrainmen

t andimpingemen

t effects , ou

r repor t examine s variou s proven andavailabl e intak

e technologie s an

dthei r cost-effectivenes s to reduc e even furthe r a ver y lo w potentia

l fo r intak e effects . A

n assessment

of additiona l technology-base dreduction s i n CWI S effects require s asite-specifi c understandin g of bot h existin g andprojecte dCWI S biologica l effect s an

dimpacts . A wide rang e o f site-specifi c informatio n i s availabl e fro m previou s sourc e wate

r andCWI S studie s ofth e existin g MLPP . A long-ter mstud y bega n i n March 199 9 t

o validat e thes e previou s finding s andconclusion s andasses s present coolin g wate

r entrainment

an dbiologica

l condition s in the MLP

P sourc e water . Thi s stud

y wa s complete di

n Februar y 2000 . The desig n an

doperatio n ofth e coolin g wate r systemfo r th e ne w combined-cycl e unit s ar

e describe dalon g wit

h adiscussio n ofth e physica l andbiologica

l characteristic s ofth e sourc e water . The finding s of

ou r long-ter mstud y tha t bega n i n March 199 9 wer

e use di n the biologica

l evaluatio n of

alternativ e CC-CWI S technologies . Separat e section s ofth e repor

t present information o

n CWI S entrainmen

t an dimpingemen

t a t th e powe r plant , followe dby a E9-053. 9 ES-4 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.2 0 Executiv e Summar

y 

### preliminar y assessmen

t of CWI S effects an

dpotentia l population-leve l impact s use di n evaluatin g the report' s lis t

of altemativ e technologies . Th e propose dne

w combined-cycl e unit s CWI S desig n represent s th e bes t technolog y availabl e fo r th e site . Fro

mbot h pas t MLP P CWI S an

dsourc e wate

r studie s an dou r present stud y findings , potentia

l entrainmen

t an dimpingemen

t effects ar e relatively minor , an

dtherefor e an y intak e technology not

alread y propose dwouldrepresent minor potentia l fo r furthe r reductions . Howeve r the ne w combined-cycl e CWIS' s lowe r intak e flows , improve dtravelin g scree n an d eliminatio n of

foreba y entrapmen

t tunnel s ar e proven andavailabl e alternativ e intak e technologie s tha

t mee t sit e engineerin g feasibility , an dcost-effectivenes s criteria . Th e implementatio n an

dbenefi t fro mthes e improvedtechnologie s ar e include di

n ou r assessmen

t o f bes t intak e technolog y availabl e fo

r the ne w combined-cycl e CWIS .

E9-05 3 9 ES- 5 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.2 1 

# 1 I 1 1 I 

# i I 1 I 1 1 1 1 I I
9 

## 1. 0 INTRODUCTIO N

The following repor

t present s the preliminar

y result s o f acoolin g wate

r intak e technolog y evaluatio n require dunde

r Section 316(b ) of

th e Federa l Clea n Wate r Ac t (CWA) . A 316(b ) demonstratio n progra

mi s currently being conducte da t Duk e Energy' s Mos s Landin g Powe r Plan t (MLPP) t o evaluat e powe r plan t coolin g wate

r intak e syste meffects an

dth e propose dne

w combined-cycl e unit s intak e technolog y relativ e t

o Bes t Technolog y Availabl e (BTA). 1 

### Duk e Energy i s plannin g t

o moderniz e th e powe

r plan t an dha s submitte dit s Applicatio n fo r Certificatio n (AFC ) t

o th e Californi aEnergy Commission . Modernizatio n projec t change s tha

t ar e proposedfo

r th e existin g intak

e ar e relatively mino

r facilit y modification s tha

t wil l significantly reduc e intak

e effects . Th

e necessar y Nationa l Pollutan t Discharg e Eliminatio n Syste m(NPDES ) permittin g proces s fo r thi s modernizatio n project

i s bein g administere di

n paralle l t o the AF C proces s b

y th e Californi aCentra

l Coas t Regiona l Wate r Qualit y Contro l Boar d(RWQCB) . Thi s 316(b ) repor t i s submitte di

n accordanc e wit

h the specification s ofth e RWQCB' s "Requirement s Letter " o f Jul y 21 , 1999 . Th e Clea n Wate r Act' s (P L 92-50 0 an

d95-217 ) Section 316(b ) require s that".. . th e location , design , construction , an

dcapacit y o f coolin g wate

r intak e structure s reflect

th e bes t technolog y availabl e fo

r minimizin g advers e environmenta l impact " (EPA , 1977) . Becaus e n o singl e intak e desig n ca n b e considere dt

o b e the bes t

technolog y availabl e a

t all sites , complianc e wit

h th e Ac t require s asite-specifi c analysi s of intake-relate dorganis mlosse s an dasite-specifi c determinatio n ofth e bes t

technolog y availabl e fo

r minimizing thos e losses . I n thi s report , intake relate dlosse s resultin g fro

mentrainmen

t (th e drawing o

f organism s into th e coolin g wate r system) an dimpingemen

t (th e retentio n o f

organism s o

n the intak e screens ) ar

e evaluate dand discussed . Intak

e technologie s ar

e evaluate daccordin g to operating , engineering , andbiologica l criteria ; th e bes t

technolog y availabl e fo

r minimizin g entrainmen

t andimpingemen

t losse s i s recommende dfo

r the coolin g wate

r intak e structur e ofth e Mos s Landin g Powe r Plant ne w combined-cycl e units . Th e firs t 316(b ) demonstratio n progra mstudie s wer

e conducte da

t th e Mos s Landin g Powe

r Plant fro m197 8 throug h mid-198 0 (PG&E , 1983) . Thi s progra mfollowedth e genera

l guidanc e provide dby th e Californi aStat e Wate r Resource s Contro l Boar

d(SWRCB) , Environmenta l Protectio n Agenc y (EPA) , Californi aDepartmen t of Fis h an dGam e (CDFG) , andUnite dState s Fis h andWildlif

e Servic e (USFWS) . Entraine dan dimpingedorganism s wer

e sample do

n a weekly basi s to gathe

r information o

n the specie s compositio n an dabundanc e o f

organism s affectedb y th e plant' s coolin g wate r system . Specia

l studie s wer

e als o conducte dt o examin e th e potentia l surviva l o f entraine dan

dimpinge dorganisms . Dat acollecte dfromnumerou s survey s 1 Th e RWQC B determine dtha

t th e existin g permittedintak

e representedthe Bes t

Technolog y Availabl e basedo n the result s ofth e previou s 316(b ) stud y (PG&E , 1983) . E9-053. 9 1- 1 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.2 2
1. 0 Introductio n 

### nea r th e plan t wer e usedi n conjunction wit

h CDF G commercia

l andsportfis h landin g dat

at o examine th e genera

l trend s i n the population s of

som e of th e specie s susceptibl e t

o th e effects of th e coolin g wate

r systems . Th

e information gatheredfro

mthes e studie s wa s use di

n conjunction wit h engineerin g an

doperatin g criteri at

o evaluat e alternativ e intak

e technologie s fo

r th e plant . The repor t conclude dtha

t ther e was no evidenc e tha

t loca l population s wer

e adversely affecte

d by the operatio n ofth e MLPP . Furthermore , i t wa s demonstrate dtha

t th e feasible alternativ e intak e technologie s examinedwouldno t hav e substantially reduce dbiologica l losse s a t the plan t o n acost-effectiv e basis . The 316(b ) demonstratio n was reviewedb y severa l agencie s includin g th e SWRCB , RWQCB , CDFG , EPA , an

dUSFWS . Question s raise db y the agencie s durin g th e review proces s wer e answeredi n supplementa

l response s t

o the 316(b ) Demonstratio n Report . Th e conclusio n o f thes e agencie s wa s tha

t no altemativ e intak

e technologie s o

r change s t o th e operation s ofth e powe r plant wer e require dbasedo

n th e information presente di n th e demonstratio n an

d information provide dt

o the agencie s durin g the review process . The modernizatio n project ha s no plan s t o chang e th

e approvedUnit s 6 an

d7 intak e facilities . 

## 1. 1 Developmen t of th e 316(b ) Stud y Plan s I n 199 8 Duk

e Energy announce dtheir

pla n t o moderniz e th e Mos s Landin g Powe r Plant . The RWQCB wa s contacte dan daserie s o f

meeting s wer

e hel dt o discus s th e renewa

l ofth e plant' s NPDE S permit . The RWQCB assemble datea mo f expert s t o assis t th e Board' s staf

f i n their revie w ofth e desig n an

dimplementatio n ofth e 316(b ) studies . Thi s team , th e Technica l Workin g Grou

p (TWG) , me

t periodically t

o discus s topic s relevant

t o ongoin g efforts a

t MLP P includin g th e desig n ofth e 316(b ) stud y plan . Th

e stud y pla n entitle dFinal

Moss Landing Power Plant Modernization Project Cooling Water

Intake and

Discharge Study Plans, (Tenera , Inc. , 1999 ) wa s submitte dt o th e RWQCB on Novembe r 18 , 1999 . The desig n ofth e 316(b ) fieldstud y progra mwa s based , i

n part , o n informatio n collecte ddurin g previou s studie s ofth e potentia l effec t o n th e aquati c communitie s o f Mos s Landin g Harbor , Elkhor n Slough , an

dMonterey Ba

y resultin g fro

moperatio n ofth e Mos s Landin g Powe r Plant' s coolin g water

systems . The thre e mos t

significan t studie s wer

e thos e conducte dby PG& E relatin g to th e effec

t ofth e coolin g wate

r discharge s o

n the beneficia

l use s ofth e receivin g water s a t th e MLP P (PG&E , 1973) , th e MLP

P Unit s 1 through 5 316(a) demonstratio n progra m (PG&E , 1978) , andth e MLP P Coolin g Wate

r Intak e Structure s 316(b ) Demonstratio n (PG&E , 1983) . Th e stud

y pla n wa s develope dusing information collecte di n thes e an dothe r studie s o f th e are ai n combinatio n wit

h stat e an dfedera l 316(b ) guideline s andwa s als o base don input fro mth e TWG . E9-053. 9 1- 2 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.2 3 1. 0 Introductio n 

# 1 1 i 1 1 1 1 1 I I I 1 1 1 1 1 1 Thre e modelin g approache s for us e in assessin g entrainmen t an dimpingemen t

losse s wer e presente dt o th e TWG . Thes e approache s ar e adul t equivalen t

los s {AEL), fecundity hindcastin g {FH), an dempirica l transpor t mode l {ETM). Thes e model s wer e describe di n adraf t report entitled , Moss Landing Power Plant Modernization Project

Cooling Water

System Intake Effects, Estimating Taxa Losses Caused by Entrainment

and Impingement, tha t

wa s submitte dt o th e TW G Septembe r

1 , 1999 . Th e repor t

wa s reviewe db y th e TW G an dthei r comment s wer e addressed . Th e repor t

wa s incorporate dint o th e Final Moss Landing Power

Plant Modernization Project

Cooling Water

Intake and

Discharge Study Plans (Tenera , Inc. , 1999) . 

## 1. 2 OveirvBe w o f tb®

316(b ) Progra m Th e basi c objectiv e ofth e 316(b ) progra mi s t o provid e asufficien t basi s for regulatory agencie s t o determin e whethe r

th e ne w combined-cycl e coolin g wate r intak e structur e (formerl y th e Unit s 1 throug h 5 intak e structure ) reflect s th e bes t technolog y availabl e fo r minimizin g advers e environmenta l impacts . T o accomplis h thi s objective , afieldstud y progra mwa s designe dan d conducte dt o determin e th e exten t o f entrainmen t

effect s a t th e Mos s Landin g Powe r Plant . Th e number s o f

aquati c organism s entraine dar e estimate dfro mplankto n sample s collecte di n fron t ofth e intak e structures . Sample s collecte di n Montere y Bay , Mos s Landin g Harbor , an dElkhorn Sloug h provide destimate s ofth e sourc e wate r population s tha t

ma y b e affecte db y entrainment . Consisten t

with th e final stud y plan , impingemen t studie s wer e not

conducted . Th e intak e structur e for

th e ne w combined-cycl e unit s wil l b e modifie da s par t ofth e modernizatio n project . Impingemen t

rate s at th e modernize dcombined-cycl e unit s intak e ar e expecte dt o decreas e from thos e reporte di n PG& E (1983 ) a s adirec t resul t o f thes e changes . 

## 1.2.1 Target

Organisms

Selected

for Study Th e TW G selecte dth e followin g aquati c organis mgroup s t o b e th e focu s ofth e 316(b ) entrainmen t

stud y at th e Mos s Landin g Powe r Plant : o Fishe s (al l lif

e stages ) o Cancer

spp . (megalopa l lif

e stage ) o Europea n gree n crab s Carcinus maenas (megalopa l lif e stage) . Fishe s an dCancer

spp . crab s wer e selecte dbecaus e o f thei r rol e i n th e ecosyste man dbecaus e som e o f the mhav e commercia l o r recreationa l value . Europea n gree n crabs , a n introduce d invasiv e species , wer e selecte dbecaus e o f concern s regardin g thei r presenc e i n th e vicinit y ofth e MLPP . E9-053. 9 1- 3 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.2 4 1. 0 Introductio n 

### Thi s repor t present s th e result s ofth e mode l approache s applie dto th e concentration s ofth e most abundan t fish tax aan

dall cance r crab s collecte di

n th e entrainmen

t samples . Concentration s of all larva l fis h tax aar e expresse da s the numbe

r pe r 1,00 0 cubi c meter s (#/1,00 0 m 3 

### ) . Fo r thi s report , w e furthe

r narrowe dthe focu s ofth e assessmen t of entrainmen

t effects t o the mos t abundan t tax ao f larva l fishe s an dall cance r crabs . Basedo

n the result s o f

entrainmen

t sampling t o date , th e eigh t mos t abundan t entraine dlarva

l specie s o r tax agroup s o

f fishe s wer e chose n fo r assessmen

t i n thi s report . The

y ar e unidentifie dgobies , ba

y goby , blackey e goby , Pacific staghor

n sculpin , whit

e croaker , blennies , longja

w mudsucker , an

dPacifi c herring . Al

l targete dcance

r cra b specie s wer

e assessed . 

## 1. 3 Organizatio n of th e Repor t Thi s 316(b ) demonstratio n i s asummar y an danalysi s ofth e dat

acollecte dan

dprocesse dfro

m March 199 9 through Februar y 2000 . Al

l datafro mfieldcollection s ar

e preliminar

y becaus e laborator y processin g qualit

y contro l check s hav e no

t al l bee n completed . Thi s repor

t include s Section s 1 through 8 . Th

e design an

doperatio n ofth e existin g Unit s 6 an d7 intak e structur e as well as the propose dmodernizatio n project' s intak e structur e ar e describe di

n Section 2 . Th

e experimenta

l design an

dstud y an dassessmen

t method s fo

r the entrainmen

t an dsourc e wate

r studie s ar e presente di

n Section 3 . Section 4 present s th e lif e histories , entrainmen

t andsourc e wate r surve y results , an

ddatacomparison s wit

h the previou s entrainmen

t stud y fo r th e eigh t fish tax aliste dabov e an

dth e targete dcra

b species . Impingemen

t datatha t wer e collecte ddurin g th e 197 9 - 1980 316(b ) stud

y hav e bee

n reanalyze dt

o estimat e th e rate o f

impingemen

t andar e presente di

n Sectio n 5 . Entrainmen

t an dimpingemen

t effects ar e evaluate di

n Sectio n 6 . Th

e bes t technolog y availabl e (BTA ) fo r th e modernize dintak

e syste mi s assesse din Sectio n 7 . Literatur e cite di n th e repor

t i s liste di n Sectio n 8 .

E9-05 3 9 1- 4 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.2 5



## 2. 0 DESCRIPTIO N O F TH E MOS S LANDIN G POWE R PLAN T AN D CHARACTERISTIC S O F TH E SOURC E WATE R BOD Y Thi s sectio n describe s th e Mos s Landin g Powe r Plan t (MLPP) andit s aquati c environmenta l setting , focusing o n th e variou s feature s ofth e existin g an dpropose dpower

plant desig n an d operation s relate dt

o th e facility' s aquati c environment . Section 2. 1 describe s th e plan t an dit s existin g andpropose dcoolin g wate r systems . Sectio n 2. 2 briefl y characterize s th e aquati c environmen

t i n th e vicinit

y ofth e MLPP . A

n analysi s of

whethe r th e modernize dsystem represent s th e bes t

technolog y availabl e t o minimiz e potentiall y advers e coolin g water intak e effects i s given i

n Sectio n 7 . 

## 2. 1 Th e Plan t an d it s Coolin g System s The Mos s Landin g Powe

r Plan t i s locate do

n th e easter n shorelin e o f

Mos s Landin g Harbor . Thi s mediu

msize dharbor , which provide s doc k spac e fo r approximately 60 0 commercia l an d recreationa

l vessels , i s locate dabou

t 11 0 mile s (17 7 km

) sout h o f Sa n Francisco . Mos s Landin g Harbor i s locate droughly midwa

y between Sant

aCru z an dMonterey , Californi aan

di s ope n to Monterey Ba

y (Figur e 2-1) . Th e plant

i s locate di

n arelativel y undevelope dare atha t include s industria l facilities , agricultura

l lands , spars e residences , recreationa l beaches , andtida

l wetlands . Th e MLP

P ha s tw o separat

e intak e structure s i

n Mos s Landin g Harbor

fo r withdrawa

l o f coolin g water

tha t i s necessar

y t o remov e exces s hea

t fro mth e power

generatio n process . One intak e previousl y service dth e now retire dUnit s 1 through 5 andi s currentl y unuse dan da secondintak

e structur e service s th e presently operatin g Unit s 6 and7 . Coolin g water fro mUnit s 6 and7 i s discharge dinto Monterey Ba y through tw o (one/unit

) subsurfac e conduits . Historically , coolin g water fro mUnit s 1 throug h 5 discharge dint o Elkhor n Slough . Th e desig n (historic) , actua

l (current) , andprojecte dspecification s ofth e new combined-cycl e unit s coolin g water intak e structur e (CWIS ) are summarize di n Tabl e 2-1 . Th e Mos s Landin g Powe

r Plant (MLPP ) currently produce s up t o about 1,50 0 M W fromtw o stea mboiler s (Unit s 6 and7) . I n addition , th e MLP

P sit e include s retire dUnit s 1 throug h 5 . Duk e Energ y propose s to replac e th e 1950 s technolog y of Unit s 1 throug h 5 wit

h tw o 530-M

W high efficienc y combined-cycl e (CC ) units . Eac h combined-cycl e uni t

wil l consis t

of tw o advance dclas s combustio n turbin e generators , tw o hea t recover y stea mgenerators , an

dasingl e stea mturbin e generator . Onl

y th e ne w stea mturbin e generator s wil l require asignificant amoun t o f ocea n coolin g water . Abou

t two-third s ofth e tota

l ne w power output wil l b e produce db y th e combustio n turbin e generators , which requir e no ocea n coolin g water .
E9-053. 9 2- 1 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.2 6
2. 0 Descriptio n o f th e Mos s Landin g Powe r Plan t an d Characteristic s o f th e Sourc e Wate r Bod y



## Francisc o Regio n Show n i n View 

# Pacifi c Ocea n Sant a L v 

## Cru z j Mos s

Landin g Powe r Plan t 

## Montere y JLMOS S 

## Ba y ^Landin g Montere y Salina s
W W E 

# s Figur e 2-1 . Th e locatio n ofth e Mos s Landing Powe r Plant .
E9-053. 9 2- 2 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.2 7 2. 0 Descriptio n o

f th e Moss Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Body Tabl e 2-1 . Histori c an

dProjectedSpecification s ofth e Cooling Wate r Intak e Structure s a

t MLPP , Unit s 1 through 5 an

dthe Ne w Combined-cycl e Units . Not e : Unit s 1 throug h 5 wer e retire di n 1995 . TB D = t o b e determined . Intak e Flo w Rat e Unit s 1- 3 an d Unit s 4 an d 5 Intak e Histori c (Design ) 381,00 0 (gpm ) 1,44 1 (mVmin ) Unit s 1- 5 Projected' " (AF C Desig n a s Revised ) 250,00 0 (gpm ) 94 6 (m'/min ) Ne w Combined-cycl e Unit s Bar Rack s Numbe r Locatio n Spacin g O C Ba r siz e 6 Shorelin e 4 (in. ) 10. 2 (cm ) 3x3/8(in. ) 7. 6 x 0. 9 (cm ) 6 Shorelin e 4 (in. ) 10. 2 (cm ) TB D Intak e Conduit s to Screenhous e Numbe r Siz e Lengt h Travelin g Screen s Locatio n Numbe r Manufacture r Mes h siz e Pump s pe r

uni t Locatio n Numbe r Manufacture r Typ e Capacit y (eac h pump ) 2 (a ) 9. 3 x 10. 6 (ft) 2. 8 x 3. 2 (m ) 350(ft ) 10 7 (m ) Vertica l Onshor e 6 Lin k Bel t 3/ 8 (in. ) 0. 9 (cm ) Unit s 1- 3 Onshor e 2 Foste r Wheele r Mixe dflo w single stag e vertica l 104. 5 (cfs ) 2.9 6 (mVsec ) 46,90 0 (gpm ) Unit s 4- 5 Onshor e 2 Foste r Wheele r Mixe dflow single stag e vertica l 55. 5 (cfs ) 1.57(m 3 /sec ) 24,90 0 (gpm ) 6 1 0 fix 27f t dee p - 1 0 (ft) ~3(m ) Incline d Shorelin e 6 TB D 5/1 6 (in. ) 0. 8 (cm ) Onshor e 3 (6,total ) TB D TB D 42,00 0 gp m Wate r velocitie s a

t maximumcapacity , mea n low , lo w wate r Approac h t o ba r

rack s Throug h ba r

rack s Approac h t o screen s Throug h screen s 0. 7 (fps ) 21.3 4 (cm/sec ) 0. 9 (fps ) 27.4 3 (cm/sec ) 1. 0 (fps ) 30.4 8 (cm/sec ) 2. 4 (fps ) 73.1 5 (cm/sec ) (2 ) (2 ) (2 ) (2 ) 0. 5 (fps ) 1 5 (cm/sec ) 0. 6 (fps ) 1 8 (cm/sec ) 0. 5 (fps ) 1 5 (cm/sec ) 0. 6 (fps) (3 ) 1 8 (cm/sec ) (1 ) Unit s 1 throug

h 5 intak e structur e modifie dt o serv e the ne

w combined-cycle plant . (2 ) Information abou

t ba r rack s an dtravelin g screen s applie s t o unit-grou

p intake s (Unit s 1 throug

h 5 shar e acommo

n intak e structure) . (3 ) Throug

h scree n velocit y base do n 6 5 percen

t ope n scree n are aan d55 ° slop e fro

mhorizontal .

E9-053. 9 2- 3 MLP P 316(b ) Resource Assessmen t 4-28-200 02. 0 Descriptio n o f th e Mos

s Landin g Powe r Plan t an d Characteristic s o f th e Sourc e Wate r Body 

### Therefore , th e ne

w combined-cycl e unit s wil l b e capabl e of generatin g about

1,06 0 M W whil e usin g abou

t 250,00 0 gp

m(94 6 mVmin

) of once-through ocea

n coolin g water

(a t 2 0 ° F [11. 1 °C ] temperatur

e increase) . B y comparison , th e existin g Unit s 6 an d7 requir e about 600,00 0 gp

m (2,27 0 mVmin

) o f ocea n coolin g wate

r (a t 2 8 ° F [15. 5 °C ] temperatur e increase ) t

o generat e 1,50 0 MW . I n additio n t

o the ne w combined-cycl e units , Duk e Energ y propose s to upgrade existin g Unit s 6 an d7 through replacemen

t ofth e stea

mturbin e high-pressur

e rotor , which wil l resul t

i n a n additiona l 1 5 M W pe r unit of generatio n capacity . Thes e tw o action s combine dyiel da n additiona l 1,09 0 M W (i.e. , 1,06

0 M W + 3 0 MW

) an dconstitut e th e Modernizatio n Project . 

### 2.1.1 Plant

Cooling Water System Description

and Operation 2.1.1. 1 Unit s 1 throug h 5 Coolin g Wate r System : Previou s Operatio n an d Propose d Modification s 

### Sinc e 1995 , Unit s 1 through 5 hav e bee n removedfro

mservic e andus e o f

tha t coolin g wate

r syste mha s bee n discontinued . The existin g intak e syste mfo r Unit s 1 throug h 5 , which will b e renovate dfo

r the Project , i s show

n schematically i

n Figur e 2-2 . The commo n coolin g wate r intak e structur e fo r Unit s 1 through 5 i s locate do n th e easter

n shor e o f Mos s Landin g Harbor . Seawate r drawn triroug

h ba r rack s a t th e entranc e t

o th e intak e structur e previousl y passe dunde

r the coas t highwa y through approximately 35 0 fee t o f tunnel t o reac h th e travelin g screen s an d circulatin g wate

r pump s locate di

n apumpwell structur

e inside th e plant . Each ofth e fiv e unit s ha dtw o circulatin g wate

r pump s tha

t historicall y pumpedcoolin g water to th e condenser s through tw o conduits , on e servin g each condense r half . Figur e 2- 2 show s th e majo

r feature s ofth e existin g intak e structure . Ba

r racks , space d4 inche s o n center , andlocate dabout 35 0 fee t i n fron t ofth e si x vertica

l travelin g screens , prevente dth e entr y of larg e object s int

o the coolin g wate

r system . Th e vertica

l travelin g screens , wit

h ames h siz e o f 3/ 8 inch , retaine dsmalle

r objects . Material s retaine db y th e screen s wer e remove ddurin g screen rotatio n an

dwashing . Screen rotatio n an dwashin g wer

e initiate dautomaticall y a

t approximately 24-hou

r intervals , o

r whe n th e across-screen hydrauli c pressure differentia l exceede dapredetermine dmaximum . The projec t

propose s t

o modif y th e existin g intak

e structur e previousl y use dfo

r Unit s 1 throug h 5 t o serv e th e ne

w C C units . Th

e travelin g screen s fo

r th e modernize dUnit s 1 throug h 5 intak e will b e locate da s clos e a s practica l t o th e shoreline , thu s reducin g th e lengt h ofth e intak

e tunne l upstrea mofth e screen s fro

m35 0 fee t to approximately 1 0 fee

t (se e Figur

e 2-3) . The ne

w travelin g screen s fo

r the C C Unit s will b e incline da t approximately 5 5 degree s fro mhorizonta

l (Figur e 2-4) , an dwill h 

### e mad

e o f continuously wove

n 1 8 x 1 8 x 1 4 wir

e mes h wit

h 3-inc h tine s E9-053. 9 2-4 MLP P 316(b ) Resource Assessmen t 4-28-200 0

# a a a • a C 3 a . a • a C

3 a •
z. u uescripiio n o rin e mos s Lanain g rowe rrian t an a cnaracteristic s o rtn e Sourc e wate rBod y



## ' EXISTIN G INLE T COOLIN G WATERSTRUCTURE. ,

UNIT S 1 throug h 5 , PLA

N VIEW,__——"""* ' i6 a 

## #--*f '

BARRACK S STO P LO G GUIDE ^ INTAK E SKIR T SIL T DIVERSIO N (SHEE T PILE ) SHORELINE $5SSS F

TRAVELIN G SCREEN S 

## „ 0



## A 

# H

Figur e 2-2 . Existin g MLP P Unit s 1 throug h 5 coolin g wate r intak e structure .
E9-053. 9 2- 5 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0

## PROPOSE D INLE T COOLIN G WATE RSTRUCTURE COMBINE D CYCL E UNITS , PLAN VIE W PUMp s
INSTAL L

CU T FLO W PAT H INSTAL L NE W TRAVELIN G SCREEN S REPAIR/REPLAC E STO P LO G GUIDE S REPLAC E INTAK E SKIR T SIL T DIVERSIO N (SHEE T PILE ) REPLAC E EXISTIN G 45,90 0 GP M PUMP S WIT H -12.00 0 GP M PUMP S , A t o F

I TEMPORAR Y COFFE RDA M Figur e 2-3 . Proposedmodernize dMLP P combined-cycl e coolin g wate r intak e structure . E9-053. 9 2- 6 MLP P 316(b ) Resourc e Assessmen t 4-28-200 035'3 "

?«t f ••*&. "rj. ---rj. >*j . •>¥ • •*» ' •'•i

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^ ^ - ^ ^ ^ '^ ' •»• • S » :«•?»••.?»? » 5 » > » ?* * f*" /

** » - ** * • " *«_

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Figur e 2-4 . Sectiona l vie w ofth e MLP P ne w combined-cycl e unit s intak e structure' s travelin g screens . E9-053. 9 2- 7 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0 T J C OP.3 2 2. 0 Descriptio n o

f th e Moss Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Bod y t o assis t wit h remova l o f

accumulate deelgras s Zostera marina durin g th e fal l season . Th e wir e mes h wil l hav e th e equivalen t o f a5/1 6 inc h openin g an dwil l hav e th e maximu mwidt h possibl e t o fit betwee n th e existin g sto p lo g guides . Th e lowe r flo w rat e approachin g th e screen s an d highe r cross-sectiona l are aofth e scree n ha s th e ne t effec t o f reducin g th e approac h velocit y at maximu mcapacit y an dmea n low , lo w water , fromth e histori c valu e o f abou t 0. 7 fp s t o approximatel y 0. 5 fp s for th e ne w C C units . I n addition , th e interna l wall s ofth e intak e structur e wil l b e modifie dt o allo w periodi c heat treatmen t for remova l o f

macroinvertebrate s ove r th e entir e length ofth e intak e system , fromth e shorelin e screen s t o th e condenser s in th e ne w C C units . Previously , it wa s possibl e t o heat

trea t onl y th e portio n ofth e Unit s 1 throug h 5 intak e syste mfromth e inlan dscreenwel l t o th e condensers , allowin g organism s t o mor e readil y coloniz e th e 35 0 feet o f untreate dintak e tunnel s upstrea mofth e screens . Predatio n b y thes e unremove d organism s was though t t o significantl y reduc e th e entrainmen t

surviva l rat e in th e ol dUnit s 1 throug h 5 system . Th e hea t treatmen t procedur e i s describe din th e followin g section . 2.1.1. 2 Unit s 6 an d 7 Coolin g Wate r System : Desig n an d Operationa l Procedure s Th e intak e for

th e once-throug h seawate r coolin g syste mcurrentl y servin g Unit s 6 an d7 i s show n schematicall y i n Figur e 2-5 . Th e intak e structure , locate do n th e shor e 70 0 fee t sout h o f th e Unit s 1 throug h 5 intak e structure , consist s o f ba r racks , travelin g screens , an dcirculatin g wate r pumps . Th e coolin g wate r flo w o f Unit 6 i s separat e fro mtha t

o f Unit 7 . Separat e subsurfac e conduit s carr y th e discharg e fro meac h uni t t o asubmerge doffshor e discharg e structur e locate din Montere y Bay 2,40 0 fee t fro mth e plant , abou t

55 0 t o 60 0 fee t

offshore , show n i n Figur e 2-6 . Figur e 2- 5 show s th e majo r feature s ofth e intak e structure . Bar racks , space d4 inche s o n center , ar e locate dabou t

1 5 fee t i n front ofth e eigh t

vertica l travelin g screens . Th e travelin g screen s ar e 3/8-inc h mesh . Materia l retaine db y th e screen s i s remove ddurin g scree n rotatio n an dwashing . Washin g i s initiate dautomaticall y eithe r b y atimer , a t

approximatel y 24-hou r interval s unde r

norma l operatin g conditions , o r whe n th e hydrauli c pressur e differentia l acros s th e scree n exceed s apredetermine dmaximum . Durin g scree n washing , spra y nozzle s was h th e collecte dmateria l int o asurroundin g sluicewa y whic h emptie s int o ascreenwas h we t well . Th e screenwas h discharge , les s th e impinge dmaterials , i s returne dt o Montere y Ba y b y large diamete r scree n refus e pump s that empt y int o th e discharg e condui t o f Unit 6 . Th e impinge d materia l tha t

separate s i n th e we t

wel l i s periodicall y remove db y aloca l refus e collectio n contracto r

an dtrucke dt o asanitar y landfil l for disposal .

E9-053. 9 2- 8 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.3 3 2. 0 Descriptio n o

f th e Mos s Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Body

71'7 "



# t X o z Figure 2-5 . MLP

P Unit s 6 an

d7 coolin g wate

r intak e structure .
E9-053. 9 2- 9 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.3 4 H ' 2. 0 Descriptio n o f th e Mos

s Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Body

60 0 SCAL E 1,20

0 FEE T GENERA L CONFIGURATIO N

POWE R PLAN T UNIT S 1- 5 AN D UNIT S 6 & 7 COOLIN G WATE R SYSTEM S DUK E ENERG Y MOS S LANDIN G LL C MOS S LANDIN G POWE R PLANT Figur e 2-6 . Locatio n ofth e MLP P Unit s 6 an

d7 discharg e structure .

E9-053. 9 2-1 0 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.3 5 2. 0 Descriptio n o

f th e Mos

s Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Bod y Th e ne w C C unit s coolin g wate r discharg e wil l combin e with th e existin g Unit s 6 an d7 coolin g wate r discharg e line s on-shore , insid e th e plant . Ther e ar e n o desig n change s t o th e existin g Unit s 6 an d7 outfal l structure s locate da s show n i n Figur e 2-6 . Th e top s ofth e discharg e pipe s ar e locate dapproximatel y 2 0 feet of f th e botto man d2 0 feet

belo w th e surface . Th e ne t effec t o f addin g th e ne w C C unit s discharg e coolin g wate r t o th e Unit s 6 an d7 discharg e flow i n th e existin g 1 2 foo t

diamete r line s i s t o increas e th e velocit y i n th e pip e fro mapproximatel y 5. 9 feet pe r secondt o approximatel y 8. 6 fee t pe r secon dat

maximu mflow. I t

shoul db e note dtha t

i n th e future , a t energ y demand s a

t th e MLP P o f

les s tha n abou t

1,000 MW , th e velocit y i n eac h pip e wil l b e reduce dt o approximatel y 2. 5 feet pe r seconda s onl y th e tw o ne w mor e efficien t combined-cycl e plant s wil l b e operating . A chemica l fee dsyste mconsistin g o f astorag e tan k

with injectio n pump s i s use dintermittently , a s necessary , t o suppl y sodiu mhypochlorit e (1 2 t o 1 4 percen t bleac h solution) , abiofoulin g inhibitor , int o th e incomin g coolin g wate r suppl y line s immediatel y afte r th e Unit s 6 an d7 intak e screen s an dbefor e th e condensers , t o reduc e biofoulin g ofth e condenser . Residua l chlorin e wil l no t excee dth e permitte dquantit y o f 20 0 part s pe r

billio n (ppb ) a t

th e outfall . Th e procedure s an dchemica l limit s ar e closel y regulate db y th e Regiona l Wate r Qualit y Contro l Boar d (RWQCB) . Th e ne w C C unit s wil l utiliz e asimila r system , excep t

tha t th e hypochlorit e solutio n injectio n poin t

wil l b e locate dat

th e condense r

inlets . Integra l t o th e desig n ofth e circulatin g wate r syste mwil l b e provision s for demusseling . Demusselin g i s required , fro mtim e t o time , t o remov e flow obstruction s withi n th e circulatin g coolin g wate r

system . Thi s procedur e wil l utiliz e th e onlin e condenser s o f bot h unit s t o suppl y heate dcoolin g wate r

int o th e coolin g wate r

suppl y lin e an dintak e tunne l b y reversin g th e flow throug h th e par t

ofth e syste mbein g treated . Th e amoun t o f tim e necessar y t o demusse l an inle t tunne l at treatmen t

temperatur e i s dependen t o n th e wate r

temperature , bu t

i s typicall y 1 hour . Th e tota l treatmen t

cycl e fro mbeginnin g t o en di s expecte dt o tak e 4 t o 6 hours . Th e intak e sto p log s o n th e tunne l bein g treate dar e close dt o preven t flow o f heate dwate r

t o th e harbor . A t

th e sam e time , th e discharg e lin e fro mth e condense r feedin g th e lin e bein g treate di s closed . Th e heate dtreatmen t

wate r flows int o th e activ e intak e tunne l whe n th e sto p log s o n th e treate d tunne l ar e closed . Th e discharg e ofth e uni t receivin g blende dcol dintak e an drecycle d v treatmen t wate r i s restricte dt o forc e par t ofth e flow throug h acrossove r lin e t o th e uni t

bein g treated . Th e balanc e ofth e wate r flows throug h th e partiall y close ddischarg e valv e t o th e discharg e tunnels . A t

th e en doftreatment , th e discharg e valve s an dintak e sto p log s ar e opene d an dth e circulatio n pump s restarted . Thi s procedur e i s repeated , a s necessary , approximatel y ever y 4 t o 6 week s i n eac h unit . Unit s 6 an d7 currentl y emplo y thi s procedur e fo r demusselin g th e inlet coolin g wate r

tunnels , aproces s whic h i s als o currentl y regulate db y th e RWQCB . Closur e ofth e sto p log s assure s tha t heate dcoolin g wate r

i s discharge donl y t o th e permitte d discharg e outfal l an dnot t o th e harbo r

b y revers e flow throug h th e intak e structure . Thi s proces s E9-053. 9 2-1 1 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.3 6 2. 0 Descriptio n o

f th e Moss Landin g Powe r Plan t an d Characteristic s o f th e Sourc e Wate r Body 

### i s conducte dsolely fo

r contro l of marin e growt

h i n th e coolin g wate

r intak e line s an di s no t intende dto provide an

y backwas h cleanin g ofth e condensers . A s describe dabove , th e ne w C C unit s will als o incorporat e th e capabilit y fo r periodi c hea

t treatmen t o f coolin g wate

r intak e lines . 

### 2. 2 Aquati c Biologica l Resource s i n th e Vicinit y o f MLP P The MLP P i s situate da

t the intersectio n of

thre e distinc t

marin e geographi c areas : Elkhor n Sloug h (tida l lagoon) , Mos s Landing Harbor , an dMonterey Bay . Eac

h o f thes e area s ha s it s ow n uniqu e aquati c biologica

l habitats . Distinc t

aquati c habitat s present

withi n th e boundarie s o f Mos s Landing Harbo

r an dElkhor n Sloug h include shallo w ope

n water , submerge daquati c vegetation , sanaVmud/sal

t flats , fresh/salt/brackis h marshes , rock y subtida l an dintertidal . Distinc t habitat s presen

t i n Montere y Ba y includ e sand y beach , rock

y intertida l an dsubtida l an d ope n wate r areas . 

### 2.2.1 Elkhorn

Slough/Moss

Landing

Harbor Elkhor n Sloug h i s anarrow , shallo w wate r embaymen

t tha t extend s 6. 2 mile s inlan dfro mth e easter n margin o f

Montere y Bay . A s i

t extend s inland , i

t gradually narrow s anddecrease s i n depth . Tida

l mu dflats andpicklewee d{Salicornia spp. ) mars h exten dth e lengt h ofth e slough . The drainag e basin fo

r Elkhor n Sloug h i s small , onl

y 22 6 squar

e mile s i n area . Th

e landnea r the slough i s usedprimarily fo

r agriculture . Shallo w ope

n wate r an dlagoo n habitat s compris e th e majorit y o f aquati c habita

t provide db y the Elkhor

n Sloug h an dMos s Landin g Harbor

complex . Severa l change s have occurre di

n the hydrolog y an

dchannel geomorpholog y sinc e th e tim e o f th e PG& E entrainmen

t andimpingemen

t studie s in 1978-198 0 (Malzon e andKvitek , 1994 ; Oxman , 1995 ; Lindquist , 1998) . I n th e mid1980 s severa

l dike s andlevee s surroundin g pastur e land s wer e reopene dt

o tida l flow. Thes e change s increase dthe surfac e wetland s b y 4 8 percent andth e tida

l volum e by 4 3 percent

(Malzone an

dKvitek , 1994) . The increase dvolume o f wate r exchange dwit

h th e tide s ha s increase dbot h th e rat e o f erosio n andth e velocit

y ofth e tida

l current s (Philip William s an dAssociates , 1992 , cite di

n Lindquist , 1998 ; Malzon e andKvitek , 1994) . Recen

t studie s ofth e effect s of

thi s erosio n on the trophi c ecolog y ofth e slough (Lindquist , 1998 ) an

dstudie s ofth e prey availabilit y fo r harbor seal s (Oxman , 1995 ) provid e update dinformation o

n th e specie s compositio n of adul t fishe s i n th e slough . Yoklavic h e

t al . (Draft , 1999 ) discus s datacollecte dfro mnumerou s studie s (pas t

andpresent) on fish assemblage s foun

di n Elkhor n Sloug h habitat s an

dsurroundin g marin e waters .

E9-053. 9 2-1 2 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.3 7 

# 1 I I I 1 1 I 1 1 i i l l i A g l 2. 0 Descriptio n o f th e Moss Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Body Th e varie dmarin e an destuarin e habitat s withi n Elkhorn Sloug h provid e habita t for at leas t 9 7 specie s offis h (representin g 4 0 families ) (Yoklavic h e t al. , 1992 ; Draft , 1999) . Mos t (76 ) o f thes e specie s ar e marin e specie s fro mMontere y Bay . Fis h specie s utilizin g th e sloug h wer e divide db y Yoklavic h e t

al . (Draft , 1999 ) int o severa l groups . Immigran t marin e specie s typicall y us e th e sloug h for spawnin g o r

a s anurser y ground . Thes e specie s includ e th e norther n anchov y Engraulis mordax, Pacifi c herrin g Clupea pallasi, an dcabezo n Scorpaenichthys marmoratus. Numerou s specie s o f flatfis h includin g th e speckle dsandda b Citharichthys stigmaeus, Englis h sol e Parophrys vetulus, san dsol e Psettichthys melanostictus, starr y flounder Platichthys stellatus, Californi ahalibut Paralichthys califomicus, an dsevera l specie s o f turbo t ar e als o considere dimmigran t marin e species . Fis h specie s considere dpermanen t resident s includ e th e Pacifi c staghor n sculpi n Leptooottus armatus, blac k surfperc h Embiotoca jacksoni, stripe dmulle t

Mugil cephaius, ba y pipefis h Syngnathus leptorhynchus, an dfive specie s o f gobies . Partia l residents , o r specie s tha t

liv e o r reproduc e i n th e sloug h bu t migrat e t o th e ocea n durin g certai n season s o r lif e stages , includ e th e jacksmel t Atherinopsis californiensis, shine r Cymatogaster

aggregata an dwhit e Phanerodon furcatus surfperches , leopar dshark Triakis semifasciata, an dbat

ray Myliobatis californica. Specie s primaril y associate dwith freshwate r includ e th e America n Alosa sapidissima an dthreadfi n Dorosoma petenense shad , mosquitofis h Gambusia affinis, prickl y sculpi n Cottus asper, threespin e sticklebac k Gasterosteus aculeatus, an dstripe dbas s Morone saxatilis. Fe w non-nativ e specie s hav e bee n note d(yellowfi n gob y Acanthogobius flavimanus, mosquitofish , America n shad , an dstripe dbass) . I n 1991 , otte r

trawl s wer e conducte da s par t o f astud y offis h availabilit y a s pre y item s for harbo r seal s (Oxman , 1995) . Otte r trawl s wer e conducte dmonthl y for ayea r (1991 ) i n Elkhor n Sloug h i n an effor

t t o establis h seasona l trend s o f fis h availabilit y an ddistribution . Th e trawl s wer e take n a t

th e sam e thre e station s (Bridge , Dairies , an dKirb y Park ) sample db y Nybakke n e t al . (1977 ) an dreporte db y Yoklavic h e t al . (1992 ) in th e mai n channe l ofth e slough . Eighty thre e daytim e otte r

trawl s capture d1,95 5 fish representin g 4 1 species . Th e 2 9 nighttim e trawl s a t tw o station s (Dairie s an dBridge ) resulte di n 1,46 1 fishe s representin g 3 9 species . Th e lowe r number s caugh t

durin g th e da y ma y hav e bee n aresul t o f fishes avoidin g th e net . Mor e the n 9 0 percen t

ofth e fishe s take n i n th e daytim e an dnighttim e trawl s wer e represente db y 1 1 species . Thes e fishes include dshine r surfperc h Cymatogaster

aggregata, Englis h sol e Parophrys vetulus, staghor n sculpi n Leptocottus armatus, Californi atonguefis h Symphurus articauda, speckle dsandda b Citharichthys stigmaeus, whit e surfperc h Phanerodon furcatus, cabezo n Scorpaenichthys marmoratus, blac k surfperc h Embiotoca jacksoni, an dlingco d Ophidion elongatus. Pipefis h Syngnathus spp . was caugh t durin g th e daytim e trawl s an dbrow n rockfis h Sebastes auriculatus wa s caugh t a t night . Oxma n (1995 ) reporte dtha t overal l ther e wa s asligh t chang e i n th e 199 1 diurna l fish assemblag e fro mtha t

reporte db y Yoklavich e t al . (1992 ) durin g 1974-1976 . Thes e change s E9-053. 9 2-1 3 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.3 8 2. 0 Descriptio n o

f th e Mos

s Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Bod y include dadecreas e i n th e mea n numbe r o f fish pe r tow , specie s diversit y decreas e at th e Bridg e an dDairie s stations , an dspecie s diversit y increase s at Kirb y Park . Specie s absen t fro mth e 199 1 daytim e trawl s tha t

wer e presen t

i n 1974-198 0 trawl s include dtopsmel t Atherinops affinis, jacksmel t Atherinopsis californiensis, Pacifi c herrin g Clupea pallasi, threadfi n sha dDorosoma pelenense, san dsol e Psettichthys melanosticus, blu e rockfis h Sebastes mystinus, queenfis h Seriphus politus, an dnigh t smel t Spirinchus starksi. Severa l specie s wer e les s abundant . Englis h sole , cabezon , lingcod , an dCaliforni atonguefis h increase di n relativ e abundanc e an d density . Oxma n (1995 ) state dtha t ther e was asignifican t

chang e in fish assemblage s a t th e Bridg e an d Dairie s station s sinc e th e 1974-198 0 otte r trawls . Severa l specie s wer e absen t an dman y wer e caugh t i n les s abundanc e in th e 199 1 tows . Englis h sole , lingcod , an dCaliforniatonguefis h increase din relativ e abundanc e an ddensity . Lindquis t (1998 ) collecte dfishe s i n otte r trawl s t o provid e informatio n o n thei r feedin g habit s fromfour station s in Elkhor n Sloug h fro mMay 199 6 t o May 1997 . H e analyze d1 1 specie s o f fis h fro mnin e families . Th e specie s wer e yellowfi n gob y Acanthogobius flavimanus, topsmel t Atherinops affinis, speckle dsanddab Citharichthys stigmaeus, arro w gob y Clevelandia ios, Pacifi c herrin g Clupea pallasi, shine r perc h Cymatogaster

aggregata, norther n anchov y Engraulis mordax, Pacifi c staghor n sculpi n Leptocottus armatus, whit e surfperc h Phanerodon furcatus, Englis h sol e Parophrys vetulus, an dCaliforni atonguefis h Symphurus atricauda. Thes e specie s accounte dfor

9 6 percen t

ofth e tota l abundanc e fromth e otte r trawls . O f

thos e specie s al l bu t yellowfin gob y an dCaliforni atonguefis h wer e dominant fishes durin g studie s conducte d i n Elkhor n Sloug h i n th e 1970 s (Lindquist , 1998) . Yoklavic h e t

al . (Draft , 1999 ) discusse dsevera l distinc t habita t type s whic h hav e bee n sample d withi n th e slough . Differen t samplin g method s wer e use dfor eac h habita t

typ e (otte r

trawl , beac h seine , an dchanne l nets) . Th e mos t abundan t an ddivers e famil y o f

fishe s withi n th e sloug h an dsurroundin g coasta l water s ar e th e embiotocids . Shine r perc h C. aggregata was th e mos t commo n specie s foun dthroughou t th e habitat s studie dan dth e Pacifi c staghor n sculpi n L. armatus wa s th e mos t abundan t specie s i n uppe r

sloug h areas . Severa l larg e elasmobranch s ar e als o relativel y commo n withi n th e sloug h (ba t ra y M. californica, shovelnos e guitarfis h Rhinobatos productus, gra y smoothhoun dMustelus califomicus, an dleopar dshark T. semifasciata; Yoklavic h e t al . Draft , 1999 ; San Filippo , 1994) . Yoklavic h (Draft , 1999 ) conclude dtha t i n general , fish assemblage s presen t i n Elkhor n Sloug h i n th e 1990 s ar e characterize db y decrease dabundanc e a t mos t sampl e site s a s wel l a s les s diversit y tha n i n th e past . Withi n th e las t twent y year s ahomogenizatio n offis h assemblage s appear s t o hav e occurre dbetwee n th e lowe r mai n channe l an dtida l channels . Thes e change s E9-053. 9 2-1 4 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.3 9 

# 1 1 1 • 

# 1 1 1

I 2. 0 Descriptio n o f th e Mos s Landin g Powe rPlan t an d Characteristic s o f th e Sourc e Wate rBod y



### hav e coincide dwit

h the continue derosio n an

dscourin g o

f smalle r channel s t

o th e poin t tha t they ar e now simila

r (in habita t type ) t o th e mai n channel (Malzone an

dKvitek , 1994) . The mos t abundantly collecte dfishes fro mstudie s reporte di

n Nybakken et

al . (1977) , Yoklavich e t al . (1991) , fro

mPG& E impingemen

t studie s i n 1978-8 0 (PG&E , 1983) , an dfro mLindquist' s wor k i n 1996-9 7 generally have remaine dthe same . Norther n anchovy , shine

r perch , an dPacific herrin g wer

e som e ofth e mos t

abundantly collecte dfishe s fro mall thre e o f

thes e studies . Topsmelt wa s the onl

y specie s collecte di

n high number s i

n impingemen

t sample s tha

t wa s no t collecte di n th e othe r tw o studies . Oxman' s (1995 ) studie s i n 199 1 however , showedgreate r difference s i

n specie s compositio n whe n compare dt

o the othe r studie s wit

h the exceptio n ofth e presenc e of

shine r perch . Thi s specie s wa s collecte di n hig h number s i

n th e slough fro

mal l studies . Fishe s tha

t wer e no t collecte di

n Oxman' s stud

y bu t wer e present i n high number s i

n all othe r studie s wer

e norther n anchov y an dPacifi c herring . Bot

h of thes e missin g specie s wer

e again collecte di

n hig h number s i

n Lindquist' s 1996-9 7 studies . Monterey Bay , California' s larges t open-coas t

embayment , i s forme

dby th e extent

o f shoreline betwee n Sant aCru z an dMonterey an

dby th e offshor

e depth s ofth e Monterey submarin e canyon . The openin g ofth e ba y i s 2 3 mile s acros s an

d1 0 mile s wide . Fou

r main tributaries , the Pajar o River , Elkhor

n Slough , th e Salina s River , an dth e Sa n Lorenz o River

flow into th e bay . The bay' s immens e supply o f cold , nutrient-rich , ocea

n wate r i s exchange dtidall y wit

h the Elkhor n Sloug h an dharbor locate dmidwa

y alon g th e ba

y shorelin e a

t th e hea dofth e canyon . Monterey Ba

y lie s withi n th e boundarie s ofth e Monterey Ba y Nationa l Marin e Sanctuar

y (MBNMS) . The MBNM S extend s fro m7 mile s nort

h ofth e Golden Gat

e Bridg e t o Cambri a Roc k i n norther n Sa n Lui s Obisp o County . Th e sanctuar y contain s about

40 0 statute mile s of coastlin e andextend s a

n averag e o f

3 0 mile s offshore . It s tota l are ai s 5,32 2 square miles . The MBNM S wa s officiall

y establishe di

n 199 2 b y th e authorit

y ofth e Secretar

y o f Commerc e unde

r th e 197 2 Marin e Protection , Research andSanctuarie s Act . The MBNM S i s one o f fourtee n marin e sanctuarie s i

n th e Unite dState s unde

r th e jurisdictio n ofth e Nationa l Oceani c Atmospheri c Associatio n (NOAA) ofth e U.S . Departmen t o f Commerce . Monterey Ba

y i s characterize db y agently slopin g shel f cu t b y asystemo f

submarin e canyons , th e larges t o f which i s th e Montere

y Submarine Canyon . The hea do f thi s canyo n i s locate dof

f ofth e entranc e t

o Mos s Landin g Harbor . The dept h ofth e canyo n range s fro

m6 0 fee t to 2,80 0 feet . The canyon i s 65 0 fee t wid e a t the hea dandapproximately 7. 5 mile s wide a t th e mout h of Monterey Bay .

E9-053. 9 2-1 5 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.4 0 

# 1 1 1
m

m BH f



# 1

m

m



### B 2. 0 Descriptio n o f th e Mos s Landin g Powe rPlan t an d Characteristic s o f fh e Sourc e Wate rBod y

Montere y Bay' s sand y beac h habita t extend s i n nearl y acontinuou s reac h o f approximatel y 2 0 mile s fro mSant aCru z t o Monterey , encompassin g th e Mos s Landin g area . Beac h habita t i n th e are ao f Mos s Landin g i s exposedt o high-energ y wave s fromth e northwest . Larg e quantitie s o f san dar e annuall y transporte do n an dof f th e beac h shorelin e b y stron g wave s an dlongshor e currents . Th e continuousl y changin g natur e o f thi s habita t

favor s mobil e invertebrat e an dfish specie s tha t

adjus t quickl y t o th e depletio n an daccretio n o f sediments . Relativel y fe w specie s ar e abl e t o adjus t

t o thi s habitat . Th e marin e resource s o f

Montere y Bay support

avariet y o f

commercia l fisherie s (Starr e t al. , 1998) . Man y ofth e fisherie s ar e ver y dynamic . Landing s ar e drive n b y th e demand s ofth e market , th e abundanc e ofth e targe t species , an dattempt s b y th e regulator s t o reduc e harvest . A s ne w market s ar e foun dfor specie s tha t

wer e previousl y unmarketabl e o r o f lo w value , annua l landing s o f

thos e specie s ca n increas e rapidly . Landing s fromothe r fisherie s declin e a s fishermen fill th e demand s ofth e ne w markets . Regulatio n offis h harvest , entr y int o afishery , gea r usage , an dseaso n length ca n hav e apronounce deffec t o n landings . Fisherie s als o declin e an dexpan dwith th e cycle s o f abundanc e an dscarcit y ofth e targete dspecies . Long-ter mover exploitatio n o f

man y fish stock s alon g th e Pacifi c Coas t ha s decrease dth e abundanc e o f adul t fishe s an drecentl y le dt o mor e restrictiv e regulatio n o f harves t levels . Som e regulation s wer e mad e becaus e o f

concern s regardin g decline s in populations . Decline s i n landing s ofte n follo w regulator y effort s an dma y not directl y reflec t

specie s abundance . Becaus e ofth e complexit y o f th e force s drivin g fish harves t i n th e Montere y Ba y area , generalization s abou t fish abundanc e basedo n landin g dat amus t b e mad e carefully . CDF G catchbloc k dat afro m197 5 throug h 199 8 wer e use dfor

th e followin g analysi s o f commerciall y importan t fish specie s presen t

i n th e Montere y Ba y region . Becaus e o f inconsistencie s i n catchbloc k reporting , landing s cite dfor a specie s o r marke t categor y b y catchbloc k

ar e generall y smalle r

tha n landing s reporte db y port . Fishe s an dinvertebrate s ar e harveste dfro mth e Montere y are ausin g avariet y o f fishing methods . A majority ofth e fishe s lande di n Montere y port s betwee n 197 5 an d199 8 was take n wit h purs e sein e an dtraw l nets . Se t gillnet s hav e traditionall y bee n use dt o harves t Californi a halibu t Paralichthys califomicus, rockfis h Sebastes spp. , whit e croake r Genyonemus lineatus, an davariet y o f

sharks . Commercia l fisherme n us e trollin g gear t o harves t

salmo n an dalbacor e durin g th e season s whe n the y ar e abundan t i n th e area . Hook - an dline - gea r ha s traditionall y bee n use dt o harves t

rockfis h Sebastes spp . an dlingco dOphiodon elongatus ove r rock y reef

s nea r th e canyon . Se t

longlines , whic h ar e no w prohibite di n nearshor e water s (withi n 1 mile) , ar e use di n th e Montere y canyo n are at o tak e sablefis h Anoplopoma fimbria an dgrenadie r (Famil y Macrouridae) . Fis h trap s an d"stic k gear " ar e use di n th e recentl y establishe dliv e rockfis h fishery . Trap s ar e als o use dt o tak e roc k crab s Cancer

spp . an dDungenes s crab Cancer magister.
E9-053. 9 2-1 6 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.4 1 

# 1 1 1 1 1 1 1 1 m 

# 1 fi 

### m 

# 1 |

ra fill 

# 1 H fl 

# 1 2. 0 Descriptio n o f fh e Moss Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Bod y 

### Th e mos t effectiv e gea

r fo r certai n species , i

n term s of biomas s harvested , i s th e purs e seine . Purs e seinin g i s use dt

o harves t pelagi c specie s suc

h a s marke

t squi dLoligo opalescens, Pacifi c sardin e Sardinops sagax, norther n anchovy Engraulis mordax, an dbot h Pacifi c mackerel Scomber japonicus an

d jac k mackere l Trachurus symmetricus. Market squi dha s consistently been one ofth e top tw o specie s lande di n th e Montere

y area . Between 1 0 an

d2 0 millio n pound s o f squi dar e typicall y lande da

t Monterey port s eac

h year . Norther

n anchovy andPacifi c sardine ran k secon dandthir

din pound s landed , however , th e fishery ha s shiftedfro mnorther n anchovy , which wer e abundan t i n th e 1970 s and1980s , t

o sardine s which hav e dominate dthe fishery i n recen t years . Bot

h Pacifi c mackere l andjac k mackerel ran

k among th e top 1 0 specie s landed . Pacifi c mackere l landing s peake di n th e earl y 1980s , rankin g between first an dfifth fro m198 0 to 1986 . Landing s of

Pacifi c mackerel hav e als o bee n hig h i n th e Monterey are adurin g the 1990s . Landing s of

jac k mackerel hav e ranke dbetween secondan dtwelft h fo r 1 9 ofth e pas t

2 4 years . Bot

h specie s of

mackere l wer

e als o landedi

n th e market

categor y "unspecifie dmackerel " which ranke dfirst

i n 1994 an dsecondfo

r th e nex t 2 years . Pacifi c herrin g Clupea pallasi hav e als o sustaine dhigh level s of harves t throug h mos t

ofth e period . The fishery i s somewha t cycli c an dpea k landing s fro

mth e are aoccurre di

n 1982 , 1987 , an

d1996 . Reporte dlanding s of Pacific herrin g range dfro

move r 560,00 0 pound s i

n 1987 t o 5 2 pound s i

n 1997 an daverage daround 165,000 pound s annually . N o landing s wer e reporte dfo

r the catchbloc k

are adurin g 199 1 an

d 1998 . Commercia

l trawler s in th e are atarget avariet y of demersa l fish species , or

groundfish . Ther

e ar e severa l distinctl y differen

t traw l fisherie s i

n Montere y Bay . Th e specie s targete ddepend s largel y on wha

t permit s th e boats , or

owners/captain s hav e been abl e to acquire . Th e harves t o f groundfis h specie s i s closel y regulate db y th e Pacifi c Fisherie s Managemen t Counci l an

d Nationa l Marin e Fisherie s Service . Th e DT S complex (Dove r sole , thornyhead , an

dsablefish ) i s targete donly b y vessel s wit h federa l limited-entr

y groundfis h permits . Th e harves t ofth e DT S complex i s secon dt

o tha t o f purs e seiner s i

n term s o f biomass . Dove

r sol e Microstomus pacificus, whic h ranke delevent h i n tota l pound s landedbetween 197 5 and1998 , di dnot ran k withi n th e to p te n specie s unti l 1985 . Thomyhead s Sebastolobus spp . andsablefis h are mor e valuabl e pe r

poun dtha n Dover sol e andthes e specie s hav e recentl y ha dmor e restrictiv e quotas . Sablefis h hav e consistentl y sustaine dhigh level s o f harvest . Longspin e thomyhead s Sebastolobus altivelis andshortspin e thomyhead s Sebastolobus alascanus were no t heavily exploite dunti l th e mid-1980s , whe n ne w market s fo

r the specie s opene din Japan . Trawler s wit

h federa l groundfis h permit s als o target splitnos e Sebastes diploproa an daurora rockfis h Sebastes aurora (Rosefis h market category) , wido w rockfis h Sebastes entomelas, bocacci o rockfis h Sebastes paucispinis, chilipeppe r rockfis h Sebastes goodei, andSebaste s complex species . The Sebaste s complex i s compose dof amixtur e o f rockfis h specie s tha

t do no t hav e specifi c quotas . Sebaste s complex specie s ar e ofte n landedi n th e market

categor y E9-053. 9 2-1 7 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.4 2 2. 0 Descriptio n o

f th e Mos

s Landin g Powe r Plan t an d Characteristic s o f th e Source Wate r Body 

### "unspecifie drockfish. " Unspecifie drockfis h landing s consistently ran k withi n th e top ten fish categorie s harveste dfro

mth e Monterey Ba

y area . The year s o f

pea k harves t fo r thi s market categor y wer e i n th e mid-1980 s an

dearly 1990s . Bocacci o andchilipepper rockfis h landing s wer e combine dint

o on e marke t categor y unti l bocacci o becam

e afederally regulate dquota species . Bocacci o hav e sustaine dconsistentl y high level s o f harves t unti l recentl y whe

n a declin e i n thei r abundanc e prompte dregulator s t o drastically reduc e quotas . Bot h chilipeppe

r rockfis h an

dth e market

categor y rosefis h hav e bee

n heavily exploite di

n th e 1990s . Bot

h wer e remove dfro

mth e Sebaste s Comple

x quot aan dgive n individua

l quota s i n 1999 . Limite dentr

y trawler s als o commonly landrex sol e Errexzachirus, petral e sol e Eopsetta jordani, Englis h sol e Parophrys vetulus, lingcod , grenadiers , an dskate/skat

e wing s {Raja spp.) . Trawler s without

afedera l groundfis h permi t

als o harves t

groundfis h (excep t

DTS) , however , thes e "Open Access " fisherme n ar e subjec t t o mor e restrictiv e quotas . Becaus e of restrictiv e rockfis h quotas , th e ope

n acces s traw l fisher

y generally target s demersa l fish specie s suc

h a s Californi ahalibut , whit

e croaker , sole , andPacifi c sandda b Citharichthys sordidus. Starr y flounder Platichthys stellatus, turbo t Pleuronichthys spp. , an

dPacifi c angel shar

k Squatina californica ar

e among the non-target

specie s caugh

t i n thi s fishery tha

t ar e considere dsaleabl e by-catch . Sandda

b harves t wa s variabl e durin g thi s perio dandrange dfro m17 7 pound s i n 198 4 t o nearly 530,00 0 pound s i

n 1998 . Fro

mCDFG catchblock

data , th e averag e annua

l harves t of sanddab s wa s around82,00 0 pounds . Sanddab s ranke dtwent y first i n pound s lande dbetween 197 5 an d1998 . Whit

e croake r ar e als o harveste db

y ope n acces s trawler s andranke dthirteent h overall . Landing s o f

whit e croake r fro mth e are aar

e somewha

t cycli c andrange dfro

m4,24 6 pound s i n 198 4 to nearl y 642,00 0 pound s i n 1980 . The averag e annua l landin g o f

whit e croake r fro mMonterey Ba

y fro m197 5 throug h 199 8 i s aroun d180,000 pounds . Whit e croake r consistentl y ranke damong th e to p te n specie s harveste di

n th e are a(annually ) fromth e mid 1970 s throug h th e earl y 1980s . Pin k shrim p Pandalus eous andspo t

prawn s Pandalus platyceros hav e become th e target o f alarg e numbe

r o f ope n acces s trawler s wit

h shrim p o r prawn permits . Th e pin

k shrim p fisher y i s seasona

l andhighly cyclic . Peak s o f harves t and fishing effor

t ar e ofte n followedb y steep decline s i n both . Spot

praw n harves t

i n th e are a consistentl y remaine da

t arelativel y low level (averag e of les s tha n 9,00 0 pound s annually ) unti l 1991 . Sinc e 199 1 th e annua l harves t ha s risen steadily to nearly 190,000 pound s (b y 1998) . Th e fisher y i s currentl y bein g driven b y th e hig h price s pai dfo r liv e spot prawns . Gillnet s hav e been a

n effective gea

r use di n th e pas t

to harves t avariet y o f species . Californi a halibut ar e th e target

ofth e fishery , however , whit e seabas s Cynoscion nobilis, whit e croaker , an dsevera l shar k specie s ar e als o regularl y lande db y gillnetters . Concer n ove r se aotter mortalit y resulte din regulatio n ofth e dept h in which gillnet s coul db e set . Currently , gillnet s canno t b e set insid e o f 3 0 fathom s (5 5 mo r

18 0 ft) of water . The annua

l harves t o f halibut fro m E9-053. 9 2-1 8 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.4 3 

# 1 1 I 1 1

_S 1 

# 1 

# • 

# 1 1 1 1 • m 2. 0 Descriptio n o f fh e Mos s Landin g Powe r Plan t an d Characteristic s o f fh e Sourc e Wate rBod y th e are arange dfromaroun d4,00 0 pound s i n 198 4 t o approximatel y 180,00 0 pound s i n 1997 . Th e averag e harves t

from197 5 t o 199 8 wa s abou t 57,00 0 pounds . Gillne t

boat s targetin g rockfis h generall y se t

thei r net s i n wate r

depth s fro m5 0 t o 12 0 fathom s (91 mt o 22 0 mo r 30 0 ft t o 72 0 ft) . Rockfis h gillnetter s targe t "red " rockfis h (vermilio n rockfis h Sebastes miniatus, yellowey e rockfis h Sebastes ruberrimus, canar y rockfis h Sebastes pinniger, coppe r rockfis h Sebastes caurinus, greenspotte drockfis h Sebastes chlorostictus, etc. ) bu t lan dlarg e number s o f bocaccio , chilipepper , an dban k rockfis h Sebastes rufus, a s wel l a s lingcod . Recen t regulatio n o f ope n acces s rockfis h harves t ha s eliminate dmuc h ofth e gillne t effor t for rockfish . Th e commercia l trol l fleet i n th e Montere y Ba y are atarget s kin g salmo n Oncorhynchus tshawytscha an dalbacor e Thunnus alalunga whe n the y ar e i n seaso n an davailable . Th e salmo n fishery ha s traditionall y bee n on e ofth e mor e lucrativ e fisherie s i n th e ba y fo r small , independen t

commercia l fishermen . Kin g salmo n harveste dwithi n th e are aran k withi n th e to p ten , in term s o f

pound s lande dannually , for al l year s (fro m197 5 t o 1998 ) excep t 198 5 an d1988 . Kin g salmo n ranke dseventh in tota l pound s lande dfor th e period . Silve r

salmo n Oncorhynchus kisutch was th e tent

h ranke dspecie s i

n 1975 . Albacor e ar e caugh t b y troller s i n th e oute r

region s o f Montere y Ba y durin g year s whe n warme r wate r i s relativel y clos e t o land . The y consistentl y ranke dwithi n th e to p te n specie s lande dfro mth e are athroughou t th e 1970 s an d1980s . Albacor e ranke dtenth i n tota l pound s lande dfro m197 5 t o 1998 . Man y boat s landin g albacor e i n are aport s fishe darea s outsid e th e bay . Som e commercia l troller s als o targe t rockfis h durin g th e seaso n whe n salmo n fishin g i s closed . B y modifyin g thei r gea r an dfishin g methods , thes e fishermen hav e traditionall y targete dre drockfis h but als o catc h asignifican t

numbe r o f bocaccio , chilipeppe r

rockfish , an dlingcod . Betwee n 198 0 an d199 8 annua l harves t (fo r al l gears ) o f re drockfis h (marke t

categor y 959 ) range dfro m9 0 pound s t o ove r 250,00 0 pounds . Th e averag e annua l harves t (Montere y area ) for

th e grou p ove r

th e las t 2 0 year s i s approximatel y 92,00 0 pounds . Th e re drockfis h marke t categor y ranke dtwenty-fourt h i n tota l pound s lande d fro m197 5 t o 1998 . Durin g th e earl y 1990 s ane w fishery evolve dt o suppl y th e marke t deman dfo r

liv e fish. Th e fishery target s nearshor e rockfis h specie s (gras s rockfis h Sebastes rastrelliger, gophe r rockfis h Sebastes carnatus, brow n rockfis h Sebastes auriculatus, chin arockfis h Sebastes nebulosus, etc. ) an dcabezo n Scorpaenichthys marmoratus. Fishe s ar e take n fromth e intertida l zon e dow n t o depth s o f 3 0 m(10 0 ft) with hoo k

an dlin e gear

o r trap s an dkep t

aliv e i n holdin g tanks . Kel p greenlin g Hexagrammos decagrammus an dlingco dar e not targe t specie s i n thi s fishery, bu t ar e commonl y landed . Harves t o f specie s fro mth e nearshor e reef s withi n Montere y Ba y an dcoasta l area s adjacen t

t o th e ba y increase ddramaticall y a s th e fishery expanded . Harves t level s peake d fo r man y specie s durin g 199 5 an d1996 . Over-exploitatio n o f thi s previousl y unregulate d resource , alon g with recen t regulation , ha s resulte di n amoderat e declin e i n landing s for mos t species . E9-053. 9 2-1 9 MLP P 316(b ) Resource Assessmen t 4-28-200 02. 0 Descriptio n o f th e Moss Landin g Powe r Plan t an d Characteristic s o f th e Sourc e Wate r Body 

### Th e Monterey Ba

y are aals o support s amoderate-size dcra b fishery . Dungenes s cra

b andtw o specie s o f roc k cra b ar e harveste dfro

mthe Monterey area . Dungenes s cra b landing s var

y wit h th e species ' abundanc e nea r th e souther

n endo f it s range . Harves t

reporte dfro

mth e are arange d fro maround1,00

0 pound s landedi

n 198 8 t o approximately 112,000 i

n 1998 . Landing s of Dungenes s cra

b fro mth e are ahave increase dsignificantly i n the 1990 s andranke dbetwee n elevent h an dthirteent h i n pound s landedannually between 199 4 an d1996 . Pacifi c roc

k cra b Cancer antennarius an

dredrock cra b Cancer productus ar

e typically lande di

n th e combined market categor y "Unspecifie droc

k crab " or their claw s ar e removedlande di

n th e "cra b claws " marke t category . Roc

k cra b landing s ar

e generally small , bu

t rangedfro

m1 2 pound s i

n 197 6 to around134,000 pound s i

n 1989 . Ther

e wa s significan

t variatio n i

n the pound s o f

cra b claw s landed . Fro

mreporte dcatchblock

dat abetwee n 198 6 an d1998 , annua

l landing s o f

cra b claw s range dfro maround81,20 0 pound s i

n 1987 to 1 poundi

n 1997 .

E9-053. 9 2-2 0 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.4 5



## 3. 0 ENTRAINMEN T STUD Y AN D ASSESSMEN T METHOD S Mos s Landin g Powe r

Plan t withdraw s wate r

for coolin g purpose s fro ma n intak e locate di n Mos s Landin g Harbor . Th e coolin g wate r i s pumpe dfromth e harbo r throug h screen s tha t

hav e 3/ 8 inc h (0. 9 cm ) mes h designe dt o exclud e anythin g greate r than th e diamete r

ofth e plant' s condenser tubes . Entrainmen t

occur s whe n organism s smal l enoug h t o pas s throug h th e 3/8-i n (0. 9 cm ) mes h ar e draw n throug h thes e screen s int o th e powe r plant' s coolin g wate r

syste m wher e the y ar e subsequentl y exposedt o stressfu l condition s —pressur e changes , shear forces , therma l changes , chemica l changes , an dcollision s with surfaces . Th e majo r

objectiv e o f

thi s 316(b ) stud y i s t o characteriz e entrainmen t a t th e Mos s Landin g Powe r Plant' s ne w combined-cycl e intak e (formerl y th e Unit s 1 throug h 5 intake) . Fiel ddat ao n th e composition an dabundanc e o f potentiall y entraine dlarva l fishe s an dcance r cra b megalop s provid e abasi s t o refin e estimate s ofth e tota l numbe r an dtype s o f

thes e organism s passin g throug h th e powe r

plant' s coolin g wate r

intak e system . Estimate s o f fractional losse s du e t o entrainmen t

b y th e ne w intak e structur e wer e obtaine dfromdat acollecte do n sourc e wate r population s o f

entrainabl e fish larva e an dCancer spp . megalops . Th e modification s t o th e ne w combined-cycl e intak e coolin g wate r flows wil l alte r

previousl y assesse dentrainmen t

rates . Dat afromsample s collecte din front ofth e intake s for

th e ne w combined-cycl e unit s wer e use dt o evaluat e entrainmen t effects . Thes e dat awer e used , assumin g 10 0 percen t

entrainmen t

mortality , with dat acollecte dfro mth e sourc e wate r t o asses s th e potentia l impac t

t o fishery resources . Th e studie s wer e designe dt o addres s th e followin g questions :

• Hav e change s occurre di n MLPP' s sourc e wate r bodie s tha t

woul dlea dt o alteratio n ofth e estimate s o f

abundanc e o r

distributio n o f

sourc e wate r

stock s o f entrainabl e larva l fishe s o r

cance r crab megalops ?

• Wha t i s th e potentia l impac t

ofth e powe r

plant' s coolin g wate r

syste mo n larva l fishes an dcance r

crabs ? Thes e result s als o provid e site - an dspecies-specifi c informatio n use dt o evaluat e th e potentia l effectivenes s o f

intak e modification s for minimizin g th e potentia l effect s o f entrainmen t

an dt o evaluat e availabl e intak e technologie s for th e ne w combined-cycl e unit s ofth e Mos s Landin g Powe r Plant . Th e Mos s Landin g Powe r Plan t entrainmen t

studie s ar e focuse do n fishes (al l lif e stages) , Cancer spp . (megalopa l lif

e stage) , an dEuropea n gree n crab s Carcinus maenas (megalopa l lif e stage) . A descriptio n o f

laborator y processin g method s i s als o provided . E9-053. 9 3- 1 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.4 6
3. 0 Entrainmen t Stud y an d Assessmen t Method s 

### 3. 1 Entrainmen t Stud y Thi s stud y wa s designe dt o quantif y th e curren t

composition an d abundanc e o f entraine dlarval fishes an dEuropea n gree n an d cance r crab megalop s a

t MLPP . Planktoni c fish egg s wer e no t quantifie din thi s study . Althoug h ther e ar e description s o f man y marin e eggs , th e taxonom y remain s difficul t

an d i s very tim e consuming . 

### 3.1.1 Entrainment

Sampling

Methods Towe dne t

samplin g bega n Marc h 2 , 199 9 an d continue dthroug h Februar y 24 , 2000 . Sample s ' take n fro mi n fron

t ofth e intake s fo

r th e ne w combined-cycl e unit s an d for Unit s 6 an d 7 wer e collecte db y towin g abong o frame wit h 0.7 1 m(2. 3 ft

) diamete r

opening s an d equippe dwith tw o 33 5 p mmes h plankto n net s an d codends . Sample s wer e collecte dove r acontinuou s 24-hou r period ; eac h perio dwa s divide dint o six , 4-hou r samplin g cycles . Two tow s wer e conducte d durin g eac h cycle . Sample s wer e collecte da t station s locate ddirectl y i n front ofth e intak e stmcture s for

bot h th e ne w combined-cycl e unit s an d for Unit s 6 an d 7 (Figur e 3-1) . Sampl e collectio n method s wer e similar t o thos e develope dan d use db y th e Californi aCooperativ e Oceani c an d Fisherie s Investigatio n (CalCOFI ) i n thei r larval fish studie s (Smith an d Richardson , 1977) . Th e bong o net s wer e lowere da s clos e t o th e botto ma s possible . Onc e th e net s wer e a

t th e correc t

depth , th e boat

wa s move dforwardan d th e net s retrieve da t a n obliqu e angl e (winc h cabl e at

a45 ° angle) . Th e winc h retrieva l spee dwa s constan t a t approximatel y 1 ft/sec . Eac h ne t

mout h wa s fitte dwit

h acalibrate dflowmete r

t o recor dth e wate r

volum e filtered . Th e targe t

wate r volum e filteredb y both bong o net s combine dwa s 4 0 m 3 (2 0 m 3 /net) . Th e sampl e volum e wa s checke dwhe n th e net s reac h th e surface . I f th e targe t

volum e wa s no t collected , th e net s wer e place dbac k i n th e wate r

an d th e to w repeate ds o tha t th e targete dvolum e wa s reached . Upo n successfu l completio n o f atow , th e net s wer e retrieve dfro mth e wate r an d al l ofth e collecte dmateria l wa s rinse dint o th e codend . Th e content s o f bot h net s wer e combine dint o asingle , labele dja r (constitutin g on e sample ) immediatel y afte r collectio n an d wer e preserve di n ethano l (ETOH) . Preservatio n usin g ETO H allow s specime n identification s t o b e geneticall y validate do r allow s for

ag e an d growth studie s shoul dth e nee darise . Eac h sampl e wa s give n aseria l numbe r basedo n th e location , date , time , an d depth o f collection . I n addition , tha t informatio n wa s logge dont o asequentiall y numbere ddat asheet . Th e sample' s seria l numbe r wa s use dt o trac k

i t throug h laborator y processing , dat aanalyses , an d reporting . Samplin g at

th e ne w combined-cycl e unit s an d Unit s 6 an d 7 intake s occurre donc e pe r wee k durin g th e pea k

larva l fish seaso n (Novembe r throug h June ) an d every othe r wee k durin g th e off

pea k perio d(Sectio n 3.1.2) . Al l ofth e entrainmen t sample s collecte dfro mth e ne w C C unit s an d
E9-053. 9 3- 2 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.4 7 3. 0 Entrainmen t Stud y an d Assessmen t Method s 

### th e Unit s 6 an

d7 intake s have bee

n sorte dan

dal l of th e larva l fishe s andtargete dcrab s have bee n identified . Qualit

y contro l resort s an

dtaxonomi c re-identification s ar e nearly complete . Similarit y wa s teste dfo

r fish dat afro mal l survey s (Survey s 1 through 42 ) fro msample s collecte di n fron t ofth e tw o intak

e complexes . Th

e result s of

thes e test s ar

e discusse di

n Section 4 .

Figur e 3-1 . Moss Landin

g Powe r Plan t samplin g locations . E9-053. 9 3- 3 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.4 8 3. 0 Entrainmen t Stud y an d Assessmen t Method s 

### 3.1.2 Entrainment

Sampling

Frequency

Rationale Usin g pea k

period s o f

larva l abundanc e fro mapreviou s MLP P entrainmen t stud y (PG&E , 1983 ; Tabl e 3-1) , arational e wa s develope dfor th e propose dsamplin g frequency . Th e eigh t tax a presente di n Tabl e 3- 1 represen t 9 4 percen t

ofth e tota l abundanc e o f larva l fishes entraine d durin g th e year s 1978-1980 . Th e observe dseasonalit y o f larva l abundanc e fro mMLP P (PG&E , 1983 ) correspond s wel l t o reporte dseasonalit y fromth e literatur e o n larva l fishe s (Matares e e t al. , 1989 ; Moser , 1996 ) an dwith apreviou s stud y conducte di n 197 4 - 197 8 nea r th e sit e ofth e presen t survey effor

t (Yoklavic h e t

al. , 1992) . Thus , i t

was propose dt o concentrat e th e samplin g effort s (on e 24-h r

perio dpe r

week ) durin g th e period s o f peak larva l abundanc e observe da t MLP P for

th e majority ofth e eigh t tax arepresente di n Tabl e 3-1 . Specifically , increase d samplin g effort s fro mth e beginnin g o f Novembe r

throug h th e en do f

Jun e (i.e. , greate r

collectio n frequency ) encompasse dth e majority o f spawnin g peak s for

thes e eigh t

taxa . Notably , th e observe dspawnin g pea k

for longja w mudsucke r

i s not encompasse dwithi n th e month s describe d above . However , th e year-roun dpresenc e an dcontinuatio n o f biweekly samplin g durin g th e remainde r

ofth e yea r

(Jul y throug h October ) i s expecte dt o adequatel y documen t th e presenc e an dabundanc e o f

thi s species . Tabl e 3-1 . Commo

n Entrainmen

t Perio dan dPea k Concentrations , i

n orde r o f Abundance , fo

r th e Eigh t Mos t Abundantl

y Entraine dLarva

l Fish Tax aa

t MLP P durin g 1978-198 0 (PG&E , 1983) . Nam e Norther n anchov y (Engraulis mordax) Gobie s (Gobiidae ) Silverside s (Atherinidae ) Smelt s (Osmeridae ) Pacifi c Staghor n sculpi n (Leptooottus armatus) Whit e croake r

(Genyonemus lineatus) Longja w mudsucke r

(Gillichthys mirabilis) Pacifi c herrin g (Clupea pallasi) Mos tCommo n Entrainmen t Perio d Novembe r

t o Apri l Year-Roun d Novembe r

t o Apri l Januar y t o Septembe r Septembe r

t o Ma y Augus t t o Apri l Year-Roun d Tw o spawnin g periods : Decembe r t o Marc h an dMa y t o Earl y Augus t Pea k Concentratio n (number / m 3 ) 5. 4 (March ) 2. 5 (January ) 2. 7 (March ) 4. 2 (February ) 0. 5 (February ) 0. 7 (Novembe r

an dDecember ) 0. 5 (Septembe r

an dOctober ) 0. 5 (January ) an d1. 3 (June ) 

### 3. 2 Sourc e Wate r Stud y 3.2.1 Source

Water Sampling

Methods Th e stud y wa s designe dt o characteriz e th e sourc e wate r composition , abundance , an d distributio n o f

larva l fishe s an dmegalopa l stage s of Cancer spp . an dEuropea n gree n crabs . Th e entrainmen t

concentration s an dintak e volume s wer e compare dt o sourc e wate r concentration s an dsourc e wate r

volume s t o provid e estimate s o f fractiona l los s a s wel l a s assis t i n th e definitio n
E9-053. 9 3-4 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.4 9 3. 0 Entrainmen t Stud y an d Assessmen t Method s 

### o f sourc e populatio n boundaries . A descriptio n of how the sourc e wate

r volume s wer

e calculate di s presente di

n Sectio n 6 . Sample s wer

e collecte da

t six station s (Tabl e 3-2) monthl y i n on e o f tw o ways ; obliqu e tow s fo r th e ocea n an dharbor station s andpus h net s fo

r th e Kirby Par

k an dDairie s stations . Th

e location s fo

r th e sourc e wate

r station s ar

e show n i n Figur e 3-1 . Th e following thre e station s wer e chosen to confor

mt o location s previously studie dby Nybakke n e t al . (1977) : (1 ) betwee

n th e Highwa

y 1 Bridg e an

dth e entranc e t

o th e Mos s Landing Harbor , (2 ) nea r th e Dairies , an

d (3 ) nea r Kirby Park . The remainin g thre e statio n location s wer e chose n basedo n discussion s wit h th e Technica

l Wor k Group durin g th e Septembe r 15 , 199 9 meeting . On

e additiona

l statio n wa s addedi

n th e mout h ofth e entranc e an

don e ocea n statio n locate dapproximately on e mil e (1. 6 km ) t o th e nort h o f th e harbo r

entranc e an

don e ocea n statio n locate dapproximately on e mil e (1. 6 km

) to the sout

h ofth e harbor

entranc e (Figur

e 3-1) . Tw o sample s o f

a t leas t 4 0 m 3 

### wer e collecte di

n dayligh t a t each statio n durin g one high an don e lo w tide . Sourc e wate

r samplin g wa s schedule dt

o occur durin g th e sam

e 24-hou r perio da s th e entrainmen

t collections . Samplin g a

t th e harbor

entranc e an

docea n station s consiste dof

a n obliqu e to w usin g the sam e methodolog y describe dabove . Samplin g a t th e Dairie s an

dKirby Par

k station s (Figur

e 3-1 ) consiste dof

pushin g a0.7 1 m(2. 3 ft) diamete r net of 33 5 fa mmes h o n th e surfac e i

n fron t of a movin g boat . All sourc e wate r sample s wer

e processe di

n th e laboratory . Additiona l samplin g ofth e Harbor

Mout h an dHarbor Bridg e station s wa s requeste dby the TW G a t th e Januar

y 18 , 200 0 meeting . Th e samplin g o f thes e station s will b e conducte ddurin g th e sam e cycle s a s th e entrainment samplin g a

t th e intakes . Thes e additiona l datawil l b e use d t

o provid e mor

e informatio n abou t

th e die l distributio n o f

larva l fishes.

E9-053. 9 3- 5 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.5 0 3. 0 Entrainmen t Stud y an d Assessmen t Method s Tabl e 3-2 . Collectio n Specification s fo r Sourc e Wate

r Sampling a

t MLPP . Statio n Nam e Ocea n North Ocea n Sout

h Harbo r Mouth Harbo r Bridg e Unit s 6 an d7 Intake Dairies Kirb y Par k Descriptio n On e mil e north o f

M L harbo r

mouth , a t

th e 20-mete r depth contour . On e mil e south o f

M L harbo r

mouth , a t th e 20-mete r depth contour . Entranc e t o Mos s Landin g Harbo r fro m Montere y Bay ; betwee n th e north an dsout h breakwaters . Mos s Landin g Harbo r

channe l a

t Highwa y 1 bridge . Mos s Landin g Harbo r

channe l a

t MLP P Unit s 6 an d7 intak e structure . Elkhorn Sloug h mai n channe l abou t 2. 2 k m (1. 4 miles ) inlan dfromth e Highwa y 1 bridge . Elkhorn Sloug h mai n channe l abou t 6. 2 k m (3. 9 miles ) inlan dfromth e Highwa y 1 bridge . Locatio n (Lat . / Long. ) 36°48.84'N / 121 ° 48.40' W 36°47.44'N / 121°48.52' W 36°48.38'N / 121 ° 47.40' W 36°48.292'N / 121°47.150' W 36°48.292'N / 121°47.130' W 36°48.74'N / 121°45.70' W 36 ° 50.40'N / 12T44.75 ' W Statio n Dept h at MLL W ( m / ft) 2 0 m / 6 6 ft 2 0 m / 6 6 f t 7 m/ 2 3 f t 7 m/ 2 3 f t 5. 5 m/ 1 8 f

t 4m/13f t 3 m / 1 0 f t 

### 3.2.2 Comparability

of Surface and Oblique Towed Methodologies Similar t o pas t studies , th e MLP P larva l fish studie s use dtw o differen t type s o f samplin g gea

r t o collec t samples . Both type s wer e selecte dt o solv e aparticula r samplin g challeng e associate d wit h differen t

statio n locations . Obliquel y towe dnet s collec t abottom-to-to p wate r

colum n sampl e an dpushe dnet s sampl e a fixeddepth , typicall y a

t th e surface . I n th e cas e ofth e MLP P studies , both gea r type s use d plankto n net s tha t

wer e equippe dwith 33 5 |i mmes h t o collec t th e sam e siz e o f

planktoni c organism s an duse dcalibrate dflowmeter s t o measur e th e volum e ofth e sample . I t i s no t expecte dtha t

samplin g efficienc y wil l vary significantl y betwee n obliquely-towe dnet s an d pushe dnets . Althoug h obliquel y towe dnet s vs . pushe dnet s woul db e presente dwit h differen t wate r t o sample , i t

i s unlikel y tha t

th e sample s collecte db y th e tw o differen t method s woul d produc e statisticall y differen t estimate s ofth e wate r

column' s larva l concentrations . Both type s o f gear ha dth e sam e diamete r

ne t mouths , use dth e sam e mes h net , ha dreduce d(McGowa n an d Brown , 1966 ) o r

n o bridl e effect s (e.g. , pus h net) , an dwer e towe da t th e sam e speeds . Thes e net s ar e designe dt o sampl e plankto n efficientl y an dt o minimiz e biase s commonl y associate dwit h samplin g planktoni c organism s (McGowa n an dBrown , 1966 ; Trante r an dSmith , 1968) . The y ar e conica l (wides t a t th e opening ) whic h promote s tumblin g o f planktoni c organism s dow n th e ne t

side s towardth e coden da s wate r i s filtere dou t

an dawa y fromth e ne t axis . Thi s typ e o f

filtration als o ha s th e advantag e o f causin g ver y littl e damag e t o th e planktoni c organism s aidin g i n both th e laborator y processin g an didentificatio n phase s o f sampl e analysis . E9-053. 9 3- 6 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.5 1 3. 0 Entrainmen t Stud y an d Assessmen t Method s However , th e fine mes h siz e o f thes e net s (33 5 p:m

) makes the msusceptibl e t o cloggin g unde r certai n condition s (e.g. , alga l bloom s o r hig h turbidity) . Clogge dnet s ca n b e precede db y a pressur e wav e reducin g filtration efficiency , warnin g mobil e zooplankter s ofth e net' s approac h (McGowa n an dBrown , 1966) , an dintroducin g unmeasure dbia s int o th e resultin g sample s du e to avoidanc e an descapement . Larva l fishes an dothe r

planktoni c organism s hav e patchy vertica l distribution s (e.g. , Schlotterbec k

an dConnally , 1982 ; Brewe r an dKleppel , 1986 ; Gray , 1993 ; Mose r an d Smith , 1993 ; Gray , 1998 ) whic h presen t uniqu e challenge s t o representativ e sampling . Th e rational e fo

r th e us e o f

a n obliqu e to w i s that

th e vertica l concentration s o f larva l fishes vary significantl y i n th e wate r

colum n an dsamplin g at

onl y on e depth woul dproduc e asampl e bia s whe n estimatin g tota l wate r colum n abundance . Fo r instance , variation s i n vertica l curren t stratificatio n o r

distributio n o f

planktoni c organism s ar e integrate db y th e representativ e samplin g o f

eac h samplin g stratu m(Simpson , 1959 ; Smit h e t al. , 1968) . Th e pushe dnet , whil e fishe da t afixe ddepth , i s use din shallo w area s wher e turbulen t tida l flo w potentiall y eliminate s wate r colum n stratificatio n o f

larva e (i.e. , th e vertica l larval distributio n shoul db e homogeneous) . Vertica l distributio n difference s ar e integrate dwhe n usin g a n obliquely-towe dne t

an dsamplin g th e entir e wate r

colum n an dar e nullifie db y shallo w wate r turbulen t mixin g i n th e cas e ofth e pushed-ne t

sampling . It

i s expecte dthat

obliquel y towe dne t

sample s at

th e deepe r

Mos s Landin g Harbo r

samplin g location s an dpushed-ne t sample s at

th e shallo w Elkhor n Sloug h samplin g locatio n wil l b e similarl y representativ e o f wate r colum n plankto n concentrations . Furthermore , i f

sligh t difference s exis t

betwee n th e towe dan dpushe dnets , i t i s probabl e tha t thes e difference s coul dno t b e statisticall y detected . 

## 3. 3 Laborator

y Processin g an d Dat a Handlin g Durin g laborator y processin g al l larva l fishes an dth e megalopa l stag e o f Cancer spp . wer e remove dfro mth e samples . Europea n gree n cra b Carcinus maenas megalop s wer e searche dfor an dremove dfro mth e samples . Fis h egg s wer e not remove dfro mth e samples . Althoug h ther e ar e description s o f

man y marin e eggs , th e taxonom y remain s difficul t an dtim e consuming . Larva l fishe s an dtargete dcrab specie s megalop s wer e identifie dt o th e lowes t taxonomi c leve l possibl e b y TENERA' S in-hous e taxonomists . I n addition , th e lifestage s o f larva l fishe s wer e identifie dan drecorde do n th e dat asheet . A laborator y qualit y contro l (QC ) progra mfor all level s o f laborator y sortin g an dtaxonomi c identificatio n wa s applie dt o al l samples . Th e Q C progra mals o incorporate dth e us e o f outside taxonomi c expert s t o provid e taxonomi c Q C an d resolv e taxonomi c uncertainties . E9-053. 9 3- 7 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.5 2 

# I 1 I 1 1 1 1 1 I I

I 

# 1 3. 0 Entrainmen t Stud y an d Assessmen t Method s



### Length s o f larva l ba y gob y andlongja

w mudsucke

r wer e obtainedusin g acompute r imaging syste man dOptima s imag e analysi s software . A qualit y assuranc e progra

mwa s maintaine dfo

r th e syste moperator . Th e imag e analysi s softwar e wa s interfaceddirectl y t

o Microsof

t Excel an d subsequently linkedt

o th e MLP P databas e i

n Microsof

t Access . Laborator y dat asheet s wer

e codedwit

h specie s o

r taxon codes . Thes e code s wer e verified agains t species/taxo n list s andsignedof f by the datamanager . The datawer e the n entere dint

o a compute r databas e fo

r analysis . 

## 3= 4 SampDnim

g Sufficienc y Specie s accumulatio n curve s wer e calculate dt

o asses s th e adequac y ofth e samplin g effor t (Krebs , 1989) . A specie s accumulatio n curv e depict s th e numbe r o f ne w specie s (specie s no

t encountere dbefore ) collecte ddurin g repeate dsamplin g efforts . I t i s i n effec t amnnin g tally of th e numbe r o f specie s collected . Th

e tall y i s cumulativ e s o eac

h specie s i s counte donl

y once . Generally , th

e slop e of aspecie s accumulatio n curv e i s steepes t durin g early samplin g efforts whe n ne w specie s ar

e frequentl y encountered . A s samplin g continue s fewe r ne w specie s ar

e collecte ds o th e slop e ofth e curv e tend s towar dzero . Thi s tren

dma y b e confoundedwhe

n computin g aspecie s accumulatio n curv e ove r tim e an dwhe n samplin g larva

l fishes, du e t

o th e reproductiv e cycle s o f

specie s within the community . Specie s accumulatio n curve s wer e compute dfro

mth e mean , maximum , an dminimumnumbe

r of specie s sample dfro

m1,00 0 rando miteration s ofth e dat at o hel p accoun t fo r seasona l difference s i

n reproductiv e cycle s among species . Result s ar

e presente di

n Section 4.1.1 . 

## 3. 5 Assessmen t Hetlhiodl s l i Larva

l samplin g a

t the coolin g wate

r intake s a t th e ne w combined-cycl e unit s provide dperiodi c estimate s o f

daily a s well a s annua

l larva l entrainment

a t th e MLPP . Estimate s of

entrainmen

t • loss , in conjunction wit h demographi c datacollecte dfro mthe fisherie s literature , permit s modelin g o f

adult equivalen t los s {AEL) an

dfecundit y hindcastin g {FH). Additiona l samplin g a

t 

# I th e potentia

l sourc e population s of

larva e i n the sourc e wate

r area s of Mos s Landin g Harbor , Elkhor n Slough , an

dMonterey Ba

y provide s the information tha t i s combine dto estimat

e atota l annua l harves t mortalit y probabilit

y using th e Empirica

l Transpor t Model {ETM). Considerin g I th e guideline s establishe di n th e EP A draf t documen t (EPA , 1977 ) an

dgiven th e constraint s of th e dataandavailabl e demographi c informatio n fo r th e larvae entrained , th e TWG wil l determin e 

# B which tax awithi n thes e group s will b e include di n mor e detaile danalyse s of

entrainment

effects whe n sufficien t datahav e been collected . Th e datarequirements , assumptions , outputs , advantages , an

ddisadvantage s of

thes e approache s ar

e summarize di

n Table s 3- 3 and3-4 . I

n th e E9-053. 9 3- 8 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.5 3 

# I t 1 1 I 1



# I 

# I 3. 0 Entrainmen t Stud y an d Assessmen t Method s

MLP P 316(b ) study , w e wil l us e eac h approac h (i.e. , AEL, FH, an dETM) a s appropriat e fo r eac h taxo n t o asses s effect s o f entrainmen t

losses .
Adul t equivalen t

los s model s evolve dfro mimpac t assessment s tha t

compare dpowe r

plan t losse s t o commercia l fisherie s harvest s and/o r estimate s ofth e abundanc e o f adults . I n th e cas e o f

adul t fishe s impinge db y intak e screens , th e compariso n wa s relativel y straightforward . T o compar e th e number s o f

impinge dsub-adult s an djuvenile s an dentraine dlarva l fishe s t o adults , it wa s necessar y t o convert

al l thes e losse s t o adul t

equivalents . Hors t

(1975 ) provide da

n earl y exampl e ofth e equivalen t adul t mode l {EAM) t o conver t number s o f

entraine dearl y lif

e stage s o f fishe s t o thei r

hypothetica l adul t

equivalency . Goodyea r

(1978 ) extende dth e metho dt o includ e th e extrapolatio n o f

impinge djuvenil e losse s t o equivalen t adults . Demographi c approaches , exemplifie db y th e EAM, produc e a n absolut e measur e o f

los s beginnin g with simpl e numerica l inventorie s o f entraine do r

impinge dindividual s an dincreasin g in complexit y whe n th e inventor y result s ar e extrapolate dt o estimat e number s o f adul t fishes , adul t crabs , o r biomass . W e wil l us e tw o differen t bu t relate ddemographi c approache s in assessin g entrainmen t

effect s at

MLPP : AEL, whic h expresse s effect s a s absolut e losse s o f number s o f

adults , an dFH, whic h estimate s th e numbe r o f adul t female s whos e reproductiv e outpu t ha s bee n eliminate db y entrainmen t o f larva e an dmegalops . Age-specifi c surviva l an dfecundity rate s ar e require dfo r AEL an dFH. Adult-equivalen t los s estimate s requir e survivorshi p estimate s fro mth e ag e a t entrainmen t

t o adul t recmitment ; FH require s eg g an dlarva l o r megalopa l survivorshi p unti l entrainment . Furthermore , t o mak e estimatio n practical , th e affecte dpopulatio n i s assume dt o b e stabl e an dstationary , an dage specifi c surviva l an dfecundity rate s ar e assume dt o b e constan t ove r time . Eac h o f

thes e approache s provide s estimate s o f adul t fish an dcrab losse s tha t

ma y stil l nee dt o b e place dint o contex t regardin g standin g fish/crab stocks . Species-specifi c survivorshi p informatio n (e.g. , age-specifi c mortality ) fro megg , larvae , an d megalo p t o adulthoo di s limite dfo r man y o f th e tax alikel y t o b e considere di n thi s assessment . Thus , i n man y cases , thes e rate s mus t b e inferre dfro mth e literatur e alon g wit h thei r measure s o f uncertainty . Uncertaint y surroundin g publishe ddemographi c parameter s i s seldo mknow n an d rarel y reported , but

th e likelihoo dtha t

i t i s very larg e shoul db e considere dwhe n interpretin g result s fromth e demographi c approache s for estimatin g entrainmen t

effects . Fo r

som e well studie dspecie s (e.g. , norther n anchov y Engraulis mordax), portion s o f thei r earl y mortalit y schedule s an dfecundity hav e bee n reporte d(e.g. , Parker , 1980 ; Zweife l an dSmith , 1981 ; Hewitt , 1982 ; Hewit t

an dMethot , 1982 ; Hewit t an dBrewer , 1983 ; L o 1983 , 1985 , 1986 ; McGurk , 1986) . Becaus e th e accurac y ofth e estimate dentrainmen t effect s fromAEL

an dFH E9-053. 9 3- 9 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.5 4
3. 0 Entrainmen t Stud y an d Assessmen t Method s 

### will depen do n the accuracy of

age-specifi c mortalit

y an dfecundit y estimates , lack

of demographi c information ma y limi t the utilit y o f thes e approaches .

E9-053. 9 3-1 0 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.5 5 ITT ' 3. 0 Entrainmen t Stud y an d Assessmen t Method s

Tabl e 3-3 . Dat aRequirements an dOutput s for Thre e Approache s Propose dt o Estimat e Effect s o f Coolin g Wate r

Withdrawal s at

MLPP . Approac h Proportiona l Entrainmen t (PE) Dat aRequire d

• Taxon-specifi c estimate s o f entrainmen t

losses . • Comparabl e life-stag e estimate s o f

taxon' s abundanc e (concentration ) i n sourc e water . Assumption s
• Sourc e wate r

sample s ar e representativ e o f th e compositio n an d abundanc e o f

larva e an dmegalop s i n th e stud y area . • Entrainmen t

sample s ar e representativ e o f th e organism s entraine din th e coolin g water . Outpu t
• Estimate dfractio n o f larva l an dmegalopa l concentratio n remove dfro mth e sourc e wate r

b y entrainment .

Adul t Equivalen t Los s (AEL) • Taxon-specifi c estimate s o f

entrainmen t

an d impingemen t

losses . • Age-specifi c mortalit y schedule s fo

r selecte dtax a fromentrainment impingement

t o som e predetermine dlif

e stag e (e.g. , recruitment) . • Fisher y resourc e abundanc e estimates fo

r relativ e impac t assessments . • Age-specifi c mortalit y

rate s ar e constan t

for th e population . • Populatio n a

t long ter mequilibriu mfor relativ e impac t assessment s (no t require dfor calculations) . • Entrainmen t

sample s ar e representativ e o f th e organism s entraine din th e coolin g water . • Numbe r o f animal s tha t woul dhav e survivedt o adulthoo d ha dthe y no t

bee n entraine do r

impinge d b y th e intake .

Fecundit y Hindcas t (FH) • Taxon-specifi c estimate s o f

entrainmen t

an d impingemen t

losses . • Species - an dage-specifi c adul t fecundity . • Age-specifi c mortalit y schedule s fo

r selecte dtax a fro mparturition/hatc h t o entrainment/impingement . • Age-specifi c mortalit y rate s ar e constan t

fo r th e population . • Populatio n at

long ter mequilibriu mfor relativ e impac t assessment s (no t require dfor calculations) . • Entrainmen t

sample s ar e representativ e o f th e organism s entraine din th e coolin g water . • Numbe r o f sexuall y matur e female s represente db y th e losse s o f reproductiv e outpu t du e t o entrainmen t

and/o r impingement .

E9-053. 9 3-1 1 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.5 6

1

i 1

*

tm
j i I i ! " 1 3. 0 Entrainmen t

Stud y an dAssessmen t

Method s | Tabl e 3-4 . Advantage s an dDisadvantage s ofth e Thre e Approache s Propose dt o Estimat e Effect s

in th e MLP P 316(b ) Assessment . | Approac

h ^ Proportiona l 1 Entrainmen t • {PE)

1 Adul t

Equivalen t TM Los s

(AEL)

1 Fecundit y Hindcas t

(FH)

E9-053. 9 Advantage s

• Empirica l estimat e o f

PE compare s larva e o r megalop s entraine dt o larva e o r megalop s in th e sourc e water . • Age - an dspecies-specifi c survivorshi p dat ano t

required .

• Entrainment/impingemen t losse s ar e expresse da s adult s facilitatin g th e interpretatio n o f

population leve l impacts . • Commo n usag e in 316(b ) studies .

• Entrainment/impingemen t losse s ar e expresse da s adult s facilitatin g th e interpretatio n o f

population leve l impacts .

3-1 2 Disadvantage s • Montere y Bay tax a(e.g. , Genyonemus lineatus) no t

adequatel y sample din presen t design . • Loca l adul t

populatio n size s no t

wel l describe db y fishery catc h dat afor . mixe dspecie s (e.g. , Sebastes spp. , Pleuronectidae , etc.) . • Scalin g intak e effect s u p t o populatio n leve l impact s wil l b e problematic .

• Difficul t t o interpre t

for entraine d organism s i

n broa dtaxonomi c categorie s (e.g. , Gobiidae spp. ) containin g multipl e life-histories . • Age - an dspecies-specifi c mortalit y dat aar e littl e know n o r

unavailabl e fo

r man y organism s tha t

ar e entrained/impinge db y th e intakes . • Loca l adul t

populatio n size s no t

wel l describe db y fishery catc h dat afor mixe dspecie s (e.g. , Sebastes spp. , Pleuronectidae , etc.) . • Age - an dspecies-specifi c mortalit y dat aar e littl e know n o r

unavailabl e for man y organism s tha t

ar e entrained/impinge db y th e intakes . • Loca l adul t

populatio n size s no t

wel l describe db y fishery catc h dat afor mixe dspecie s (e.g. , Sebastes spp , Pleuronectidae , etc) . • Scalin g intak e effect s u p t o populatio n leve l impact s wil l b e problematic . • Age - an dspecies-specifi c fecundity dat ahav e no t

bee n previousl y reporte d for man y organism s tha t

ar e entrained/impinge db y intakes .

MLP P 316(b ) Resourc e Assessment

4-28-200 0P.5 7 3. 0 Entrainmen t Stud y an d Assessmen t Method s 

### Th e precursor

t o the AEL andFH calculation s i s a

n estimat e of tota l annua l larva l an dmegalopa

l entrainment . A

n estimat e o f larva l an dmegalopa

l entrainmen

t a t the ne w combined-cycl e unit s intak e wil l b e basedo

n periodi c to w sample s wit h tota l annua l entrainmen

t a t MLP P expresse d as t T 

### = tcc 

### (1 ) wher e E cc 

### i s the estimat

e o f tota l entrainmen

t a t the ne w combined-cycl e unit s intak e (Appendix A) . Estimate s o f tota l entrainmen

t a t the intak e ar e base do n two-stag e samplin g designs , wit

h day s withi n period s andreplicat e tow s within days . The within-da y samplin g i s basedo n astratifie drandomsamplin g schem e wit h 4 tempora

l stratacorrespondin g t

o tida l flows (Appendix A) . 3.5.1. 1 Adul t Equivalen t Los s (AEL) 

### Th e AEL approach use s estimate s ofth e abundanc e ofth e entraine dor impingedorganism s (i.e. , E T 

### ) t o project the los s of

equivalent

number s o f

adult s basedo

n mortalit y schedule s an

dage-atrecruitment . Th

e primar y advantag e o

f thi s approach i s tha

t i t translate s powe

r plant-induce d earl y life-stag e mortalit

y int o number s o f

adul t fishe s an dadult cance r crab s tha t ar e familia r unit s to resourc e managers . Adult equivalen t los s doe s not

requir e sourc e water

estimate s of larva l o r megalopa l abundanc e i

n assessin g effects . Thi s latte r advantag e ma

y b e offse t by the needt o gathe r age-specifi c mortalit

y rate s t o predic t adult losse s andth e nee dfo

r information o

n th e adult populatio n o f

interes t fo r estimatin g population-leve l effect s (i.e. , fractional losses) . However , th e needfo

r age-specifi c mortalit

y estimate s ca

n b e reduce db y variou s forms o f approximatio n a s sho w b y Sail ae t al . (1997) . The

y describ e a

n AEL andapply i

t to six year s o

f entrainmen

t an dtw o year s of

impingemen

t dat afo r winte r flounde r Pleuronectes americanus, redhak e Urophycis chuss, andpolloc k Pollachius virens a

t th e Seabrook

Station , i n Ne w Hampshire , andcontras t

thes e wit h equivalen

t adul t losse s o f winte r flounder a t PilgrimStation , anothe r coasta l powe r plant . Their

model assume s a

n adul t populatio n a

t equilibrium , astabl e ag e distribution , aconstant male:femal e ratio , anda

n absenc e o f

density-dependent

(i.e. , compensatory ) mortalit

y betwee n entrainmen

t an drecmitment

t o th e adults . Startin g wit

h th e numbe

r o f ag e clas s /

larva e entraine d(EA, i

t i s conceptuall y eas y to conver t thes e number s t

o a n equivalent

numbe r o f adult s los t

(AEL) a t som e specifie dag e clas s fro

mth e formula : AEL^Efi (2 

### ) 1= 1 E9-053. 9 3-1 3 MLP P 316(b ) Resource Assessmen t •4-28-200 0P.5 8 3. 0 Entrainmen t Stud y an d Assessmen t Method s wher e n = numbe r

o f ag e classes ; E- = estimate dnumbe r

o f larva e an dmegalop s los t i n ag e clas s / ; an d S t = surviva l probabilit y for th e ith clas s t o adulthoo d(Goodyear , 1978) . Age-specifi c surviva l rate s fro mlarva l an dmegalopa l stage s t o recmitmen t int o th e fishery mus t b e include din thi s assessmen t method . Fo r

som e commercia l species , natura l surviva l rate s ar e know n after

th e fishe s o r

crab s recmi t

int o th e commercia l fishery . Fo r th e earlie r

year s o f development , thi s informatio n i s no t well-know n an dmay b e lackin g for non-commercia l species . Th e informatio n o n surviva l probabilitie s i n Equatio n (2 ) wil l likel y b e unknown , in whic h cas e a simplifie dAEL

expressio n ca

n b e writte n a s AEL = E T -S A (3 ) wher e S

A = surviva l fro mth e average ag e o f larval entrainmen t

t o adulthood . Th e exac t varianc e for

Equatio n (2 ) ca n b e expresse da s Var(AEL) = E

2 T • Var(JE T

) + S 2 A • Var[s

A ) + Var{E T

)• Var(S

A ). Th e behavio r

o f estimato r (3 ) for AEL appear s log-linear , suggestin g tha t an approximat e confidenc e interva l can b e base do n th e assumption s tha t ln ( AEL) i s normall y distribute dan d use s th e pivota l quantit y In AEL-\n AEL \Var{AEL) i AEL2 A 9 0 percen t

confidenc e interva l for

AEL wa s estimate db y solvin g for AEL an dsettin g Z equa l t o ±1.645 , i.e . AEL-e v AEL t o AEL-e V AEL 3.5.1. 2 Fecundit y Hindcastin g (FW ) Th e FH approac h compare s larva l an dmegalopa l entrainmen t losse s wit h adul t

fecundit y t o estimat e th e amoun t

o f adul t femal e reproductiv e outpu t eliminate db y entrainmen t an dthereb y E9-053. 9 3-1 4 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.5 9 3. 0 Entrainmen t Study an d Assessmen t Method s hindcast s th e number s o f adul t female s effectivel y remove dfro mth e reproductivel y activ e population . Th e accurac y o f thes e estimate s o f

effects , a s with thos e ofth e AEL above , i s dependen t

upo n accurat e estimate s o f age-specifi c mortality fromth e eg g an dearl y larva l o r megalopa l stage s t o entrainment . I f i t ca n b e assume dtha t

th e adul t populatio n ha s bee n stabl e a t som e curren t

leve l o f exploitatio n an dtha t

th e male:femal e ratio i s constan t an d50:50 , the n fecundity an dmortalit y ar e integrate dint o a n estimat e o f

los s b y convertin g entraine dlarva e an d megalop s bac k

int o female s (i.e. , hindcasting) . A potentia l advantag e o f

FH i s tha t survivorshi p nee donl y b e estimate dfor arelativel y short perio dofth e larva l stag e (i.e. , eg g t o larva l o r megalopa l entrainment) . Th e metho drequire s age-specifi c mortalit y rate s an dfecunditie s t o estimat e entrainmen t effect s an dsom e knowledg e ofth e abundanc e o f

adult s t o asses s th e fractional losse s thes e effect s represent . Thi s metho d assume s that

th e los s o f

asingl e female' s reproductiv e potentia l i s equivalen t t o th e los s o f

a n adul t fish o r crab whic h ma y b e inaccurate . I n th e FH approach , th e tota l o f

larval entrainmen t

fo r aspecie s \E T

\ wil l b e projecte dbackwar d t o estimat e th e numbe r

o f breeding female s require dt o provid e th e number s o f larva e an d megalop s see n i n th e entrainmen t samples . Th e estimate dnumbe r o f breedin g female s (FH) whos e fecundity i s equa l t o th e tota l los s o f entraine dlarva e an dmegalop s woul db e calculate d a s follows :

FT v= ' *J wher e v v = numbe r

o f week s th e larva e o r

megalop s ar e vulnerabl e t o entrainment ; Ej= estimate dtota l entrainmen t fo r they't h wee k (/ ' = 1,... , vv) ; Sj= surviva l rat e fro megg s t o larva e ofth e stag e presen t i n they't h wee k (J = 1,... , vv) ; FT = averag e tota l lifetim e fecundity for females , equivalen t

t o th e averag e numbe r

o f egg s spawne dpe r

femal e ove r

thei r reproductiv e years . Th e tw o ke y inpu t

parameter s i n Equatio n (5 ) ar e fecundity FT an dver y earl y surviva l rate s [SA fromspawnin g t o week y ofth e survey . Description s o f thes e parameter s ma y b e limite dfor man y specie s an dar e apossibl e limitatio n ofth e method . Typically , th e informatio n for th e finegraine dag e stmctur e ofth e Equatio n ( 5 ) wil l no t b e available , an dth e FH calculation s wil l b e reduce dt o

E9-053. 9 3-1 5 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.6 0 3. 0 Entrainmen t Stud y an d Assessmen t Method s

^ Erf 

### FH= 

# W (6) wher e S L 

### = surviva l fro meg g t o th e averag e ag e o

f larva l entrainment . Th e varianc e fo

r the FH calculation s [Equation (6) ] i s Var(FH) = (FH) 2 

### CV(E T



### f +CV(P T 

### ) +CV(s L 

### f (7 ) 

### where , i n general , 

### r\ 2 Var

### { 0 

### ) CV 

# { 0 

# ) =^r Th e behavior of estimator (7 ) fo r FH appear s log-linear , suggesting tha t a n approximat

e confidenc e interva

l ca n b e basedo

n the assumption s tha

t \n{FH ) i s normally distribute dan d use s th e pivota

l quantit y InFH-lnFH

\Var{FH) V FH

2 

### A 90 percen

t confidenc e interva

l fo r FH wa s estimate db

y solving fo

r FH andsettin g Z equa

l t o ±1.645 , i.e . V FH 2 tn r u . „ V FH 2 {FH) •|.U*tJ, ( 7 

### FHe v 

### TM 2 

### to FH-e 

### 3.5.2 Empirical

Transport

Model (ETM) The empirica

l transpor t model {ETM) ha s bee

n propose dby th e U.S . Fis h andWildlif e Servic e t o estimat e mortalit y rate s resultin g fro

mcoolin g water

withdrawal s a

t powe r plant s (Borema

n e t al. , 1978 , 1981) . Variation s of thi s mode l hav e bee n discusse di

n MacCall e

t al . (1983 ) an

d usedt o asses s impact s (Parke

r an dDeMartini , 1989) . The ETM has been use dt

o asses s impact s a t th e Sale mNuclea r Generatin g Statio n i

n Delawar e Bay , Ne w Jersey (PSE&G , 1993 ) a s well a s othe r powe r station s alon g th e Eas t

Coast . The ETM

approach wa s als o use da

t th e Diabl o Canyon Powe

r Plan t i n centra l California . W

e wil l employ ametho dsimila r to tha t describe db y MacCall e t al . (1983 ) an

duse db y Parke r an dDeMartin

i (1989 ) whil e unde

r contrac t t o the Marine Review Committe e in their final repor

t t o th e Californi aCoasta

l Commissio n (Murdoch e t al. , 1989 ) fo

r Sa n Onofr e Nuclea r Generatin g Statio n o

n the coas t o f souther n California . E9-053. 9 3-1 6 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.6 1 

# 1 

# e

m m WB

9 E



# 1 1 m 

# 1

mrf



### m H 3. 0 Entrainmen t Stud y an d Assessmen t Method s



### Empirica l transpor t modelin g permit s the estimatio n of annua l conditiona

l mortalit y du e t o entrainmen

t whil e accountin g fo

r the spatia l an dtempora l variabilit y i n distributio n an

d vulnerabilit

y of eac h lif e stag e to powe

r plant withdrawals . Th

e generalize dfor

mo f ETM incorporate s man

y time- , space- , an

dage-specifi c estimate s of

sourc e wate

r larva l an dmegalopa

l mortalit y a s well a s informatio n regardin g spawning periodicit y an dduration , mos t

of whic h ar e limitedo r unknown fo

r the marin e tax abein g investigated . A t MLPP , th e larva

l andmegalopa

l sourc e populatio n ha s a priori bee n defineda s thos e larva

e an dmegalop s i

n the Monterey Bay , Mos s Landing Harbor , an dElkhor n Sloug h a s show n i n Figur e 3-2 . 3.5.2. 1 Sourc e Wate ran d Receivin g Wate rVolume s 

### A variet y of method s wer

e usedt o estimat e th e volume s ofth e sourc e an dreceivin g wate

r bodie s associate dwit

h the Mos s Landin g Powe

r Plant . Th e method s usedt

o determine th e stati c wate

r volume s of

Mos s Landin g Harbor , Elkhor n Slough , an

daprescribe dnearshor

e portio n o f Montere y Ba y (ocea n sourc e water) ar

e presente dbelow . Wher

e i t i s applicable , th

e method s usedt o determin e the daily tida

l exchang e ofth e individua l wate r bodie s ar e als o given . Monterey

Bay (nearshore)

/ MLPP Ocean Source Water 

### The volum

e of Monterey Ba

y wate r providin g MLP

P coolin g wate

r wa s estimate dby tw o methods . The first

metho dwa s base do

n the rational e tha

t th e majorit

y o f entraine dba

y specie s originate di

n th e shallo w ba

y habitat s i

n contac t wit h nearshor e current s reachin g the harbor entrance . Ocea

n botto mdepth s immediately i n fron t ofth e harbor' s entranc e plung e rapidly int o th e Monterey Canyon . Th e bay' s depth s t o th e nort h an dsout h shoa l t o become broa

dsandan d mudbotto mplain s characteristi c ofth e bays ' nearshor e habita t fo r whit e croake r an dPacifi c staghor n sculpin ; th e only ba

y specie s appearin g i

n MLP P entrainmen

t sample s i n an y number . The volum

e of thi s nearshore , source-wate r habita t wa s calculate dfo

r th e are aone kilomete

r nort h an done kilomete

r sout h ofth e harbor

entranc e ou

t t o adept h of 5 0 m . I n discussion s wit

h th e Technica

l Workin g Grou

p an dCaliforni aEnergy Commission staff , it wa s agree dt

o boun d ou r estimat e o f Monterey Ba

y sourc e wate

r volum e basedon habita

t wit h th e daily tida

l exchang e volum

e ofth e harbor/slough . Method s andsource s o f

information use dt

o estimat e thi s rang e o f

Montere y sourc e wate

r volum e ar e describe dhere . For

th e purpose s of

thi s study , th e nearshor

e water s o f

Montere y Bay/MLP P ocea n sourc e water s ar

e defineda s thos e lying along ashorelin e reac h of 2,00 0 mto th e nort h an dsout h ofth e Mos s Landin g Harbor entranc e an

dextendin g out

t o adept h o f 5 0 m (Figur e 3-2) . The volum

e of thi s wate r bod y wa s calculate dusin g the informatio n provide db y th e Nationa

l Oceani c andAtmospheri c Administratio n (NOAA ) char t #1868 5 (31 s t



### edition , E9-053. 9 3-1 7 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.6 2 3. 0 Entrainmen t Stud y an d Assessmen t Method s 

# 1 1 

# 1 1 1 1 I 1 1

an



### H 

# I

^ 9 

### Ma

y 16 , 1998) . The are adescribe dabov e was inscribe do n the char t an dthen subsequently divide dint

o small sector s of

simpl e geometri c shapes . Th e siz e ofth e sector s wa s dependen t upon th e natur

e ofth e complexit

y ofth e bottomcharacteristic s withi n the sector . Area s wit h larg e expanse s o f

botto mtopograph

y havin g fairl

y unifor mslope s were enclose dwithi n suitabl y larg e geometri c sectors . Area s wit h mor e comple x bottomtopography , lik

e thos e i n the vicinit

y ofth e Montere

y submarine canyon , wer

e enclosedi

n relatively small sectors . Th e purpos e o

f thi s exercis e wa s t

o provide sector s tha

t wer e of asiz e tha t allowe deas y estimatio n ofth e averag e dept

h within the sector . Whe

n thi s was completedth e surfac e are ao f eac h sector an dit s volume , base do

n the averag e dept

h within the sector , wer

e calculated . Whe

n the sector

volume s wer e totaled , th e ocea

n sourc e wate

r volum e wa s determine dto b e 27 5 x IO 6

### m3


### . It shouldb e notedtha t th e dept h sounding s foun

do n NOA A char t #1868 5 ar

e given a t Mea n Lowe r Lo w Wate r (MLLW) (0. 0 feet) . Th

e volume s ofth e othe

r wate r bodie s associate dwit

h the MLP P (se e below ) wer

e subsequently adjustedt

o be representativ e o f

tida l condition s equivalen

t t o Mea n SeaLevel (MSL) (+2. 7 feet) . Th e ocea n sourc e wate

r volume , however , i s littl e affecte d by tida l fluctuation s sinc e th e borde r tha t define s it s area , the 50-misobath , als o fluctuate s i n positio n wit

h th e ris e an

dfal l ofth e tides . Moss Landing Harbor 

### The volum

e o f Mos s Landin g Harbo

r wa s determinedusin g method s simila r to thos e usedto determin e th e volum

e ofth e Montere

y Ba y nearshor e /ocea n sourc e water . Dept

h sounding s wer e again taken fro

mNOA A char t #18685 . Th

e char t als o contain s detaile dinformation o n the dredg e depth s ofth e boa

t channel s an

dturnin g basin s within th e harbor . Th e harbor wa s defined a s th e are afro

mth e end s ofth e breakwater s (harbo r mouth) eas t

t o th e mout h of Elkhor n Sloug h (Highwa y 1 bridge ) an

dinclude dthe nort

h an dsout h arm s ofth e navigabl e harbor (Figur e 3-2) . Th e harbor

wa s divide dint

o geometri c sector s an

dthe averag e depth , surfac e area , andsector volum e wer e then calculated . The tota l volum e ofth e harbor

a t MLL W wa s determine dto b e 770,00 0 m3


### . The volum

e ofth e harbor

a t MS L wa s calculate db y multiplyin g th e tota l surfac e are aofth e harbo r

b y th e differenc e i

n tida l heigh t betwee n MS L an dMLL W (2. 7 feet

) an d addin g the resultin g numbe r t o th e MLL W volume . Volum

e a t MS L wa s calculate dt

o b e 1.1 5 x 10 6 

### m 3


### . Daily tida

l exchang e fo

r th e harbor

alone wa s calculate dt

o b e 1.0 3 x 10 6 

### m 3 

### base don a mea n tide rang e of

3. 6 fee t an dth e calculate dharbo

r area . Elkhorn Slough 

### I n th e 198 3 316(b ) Demonstratio n report , Pacifi c Gas andElectri c Compan y liste dth e tota

l volum e of Elkhor n Sloug h a t MS L t o b e 4. 8 x IO

6 

### m 3 

### (PG&E , 1983) . Sinc e tha

t time channel erosion , accompanie dby dik e an dleve e breaches , hav e increase dth e tota l surfac e are aandtida

l volume ofth e system(Figur e 3-2) . Malzone andKvite

k (1994 ) reporte da4 3 percent increas e in tida l volum e an da4 8 percen

t increas e i n th e tota l surfac e are aofth e systemove r th e decade E9-053. 9 3-1 8 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.6 3
3. 0 Entrainmen t Stud y an d Assessmen t Method s 

### precedin g their

work . Basedo

n bathymetri c survey s conducte di n 199 3 an ddirec t tida l measurement s taken within th e slough , the y calculate dthe tota

l tida l volum e o f the syste mt o b e 5.5 5 x IO6 

### m3


### . Thi s equate s t o adaily (25-hr

) tida l exchang e o f

11. 1 x IO

6 

### m 3 

### fo r th e sloug h system . Usin g th e datacollecte ddurin g th e 199 3 surveys , Malzone (1999 ) calculate dth e tota l volum e ofth e Elkhor

n Sloug h syste mt o b e 1 0 x IO

6 

### m 3 

### a t MSL .

E9-053. 9 3-1 9 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.6 4 3. 0 Entrainmen t Stud y an d Assessmen t Method s

Montere y Ba y (nearshore) MLP P Ocea n Source Wate r

Figure 3-2 . Location of

Montere y Ba y nearshor e MLP P ocea n sourc e water , Mos s Landin g Harbor , an d Elkhor n Slough area s usedi

n calculatin g sourc e wate

r an dreceivin g wate

r volumes .

E9-053. 9 3-2 0 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.6 5 3. 0 Entrainmen t Stud y an d Assessmen t Method s Th e purpos e ofth e ETM

calculation s i s t o estimat e th e probabilit y o f mortalit y o f

larva e an d megalop s associate dwit

h powe r plan t entrainment . Th e calculation s requir e not onl y th e abundanc e o f

larva e an dmegalop s entraine dbu t als o th e abundanc e ofth e larva l an dmegalopa l population s at

risk o f entrainment . Th e samplin g a t th e coolin g wate r

intake s i s use dt o estimat e entraine dnumbers . O n an y on e samplin g day , th e conditiona l entrainmen t mortalit y ca n b e expresse da s E T PE u = T " (9 )

R u wher e Ej: - tota l number s o f larva e entraine do n they't h day (j= 1 , ...,d { ) ofth e iih tempora l samplin g stratu m(

/ = 1,... , L); Rjj= number s o f

larva e at risk o f entrainment , i.e. , abundanc e o f larva e in Montere y Ba

y (MB) , Mos s Landin g Harbo r (MLH) , an dElkhorn Sloug h (ES) . I n rum , th e abundanc e o f

entraine dlarva e an dmegalop s ca n b e expresse da s th e entrainmen t number s a

t th e ne w combined-cycl e unit s intak e wher e E T v -r.E^(10 ) an dEy C i s th e entrainmen t

abundanc e a t

th e ne w combined-cycl e unit s intak e o n they't h samplin g day . Wit

h th e larva l an dmegalopa l sourc e population s a priori defined , th e abundanc e o f larva e an dmegalop s at

risk ca n the n b e directl y expresse da s R,j= V m • D miJ + V^• D mmj+ V ES -D ESij(H ) wher e V denote s th e wate r

volum e an dD, th e averag e larva l an dmegalopa l concentratio n i n a sourc e populatio n durin g th e //th samplin g day . Combinin g Equation s (9-11) , th e probabilit y o f entrainmen t

for alarva e an dmegalo p i n th e thre e sourc e population s durin g th e (/t h samplin g da y ca n b e estimate d(Appendi x C ) b y pec

PE = = ^ r-^r- (VMB ' D MBi j+ ^MLH

' L^MBij+ 'ES

' ^EStj

E9-053. 9 3-2 1 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.6 6 3. 0 Entrainmen t Stud y an d Assessmen t Method s PE = 

### E? *MB ' ^MBij

+ 'MLH

' L>MBij

+ * ES ' ^ESij

I ^^f Th e ETM mode l use s th e periodi c estimate s o f PEtjt o estimat e th e annua l probabilit y o f entrainmen t

mortalit y ( P M ) . Ho w th e ETM

calculation s incorporat e th e individua l estimate s o f PEtjdepend s o n th e natur e o f th e entrainmen t

proces s an do n th e namr e ofth e spawnin g an dhatchin g sequenc e ofth e fish o r cra b species . Mode l formulatio n wil l diffe r whethe r ther e i s asingl e synchronou s breedin g o r whethe r ther e i s multipl e overlappin g breedin g b y th e species . I n th e cas e o f asingl e synchronou s breedin g withi n asurve y period , th e ETM can b e formulate da s 

## p M 

## =i-iif{\-PE,) D 

## ' (n )

1= 1 wher e D. = numbe r

o f day s that larva e o r megalop s ar e susceptibl e t o entrainmen t i n th e rth samplin g perio dan df

- th e fractio n ofth e spawnin g tha t occurre ddurin g th e it

h samplin g period . I n Equatio n (13) , th e estimate dentrainmen t mortalit y probabilit y PE. i s assume dt o b e representativ e ofth e dail y mortalit y durin g th e £> , perio do f

time . I n th e cas e wher e ther e ar e multipl e non-overlappin g spawnings , th e ETM calculation s ca n b e formulate da s 

### h=\-tXfij(\-PEij) D 

### * (14 ) i= I > ! wher e f

tj= fractio n o f

th e spawnin g tha t

occurre ddurin g th e i/t

h samplin g period , D tj= th e numbe r o f day s i n th e i/t

h samplin g period , an dd i ar e th e numbe r o f brood s i n th e i't

h samplin g period . Equatio n (14 ) assume s th e population-wid e probabilit y o f entrainmen t

i s th e essenc e o f th e ETM approac h o f

MacCal l e t

al . (1983) . I f

thi s populatio n i s stabl e an dstationary , the n P M i s als o an indicato r

ofth e effect s o n th e full y recmite dag e classe s whe n n o compensator y natura l mortalit y i s assumed .

E9-05 3 9 3-2 2 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.6 7 

# 1 1 1 1 1 1 B 

# 1 1 4. 0 Entrainmen t an d Sourc e Wate rResult s



# I 

# I 

# 1 1 1 1 1 4 D 

## © ENTRADNMEN T AM D SOURC E WATE R RESULT S Larva l fish andtargete dcra

b specie s datapresente di

n thi s section ar

e fro mentrainment

an d sourc e wate

r sample s tha

t hav e ha dthe laborator

y processin g procedur

e completed . Entrainmen

t dataar e fro mweekly 24-hou

r survey s conducte dfro

mMarc h 2 , 199 9 throug h Jun e 30 , 199 9 an d fro msurvey s conducte dever

y othe r wee k fro mJul y through Octobe

r 1999 . Datafro

mth e weekly survey s i

n NovembeiTT^^TlTro ^ 200 0 fromth e new combined-cycl e unit s intak e ar e als o discussed . The remaining sample s collecte dfro mth e Unit s 6 an

d7 intak e ar e currently bein g processe dan dth e resultin g dat

awil l be reporte di

n th e Fina l 316(b ) demonstration . Dat

afro mal l monthl y sourc e wate

r sample s fro

minceptio n (June 1999 ) throug h Febmar y 200 0 ar e als o presented . Basedo n discussion s a

t the Januar y 18 , 200 0 Technica

l Working Grou

p meeting , w e measureda sub-sampl e o

f ba y gob y Lepidogobius lepidus andal l longja w mudsucke

r Gillichthys mirabilis larva e fro mth e following surveys :
° the ne w combined-cycl e unit s intak e entrainmen

t survey s tha

t coincide dwit

h monthl y sourc e wate

r survey s (June 199 9 throug h Januar y 2000) , an

d o al l sourc e wate

r sample s (June 199 9 throug h Januar y 2000) . Thes e lengt

h dat awill b e usedt

o estimat e the age s o

f larva e entraine dan

dth e larva e availabl e fro mth e sourc e populations . Thes e dat aar e presente di

n Section 4. 4 fo

r ba y goby an dSection 4. 9 fo r longja w mudsucker . Bot

h specie s collecte di

n th e Febmar

y 200 0 survey s ar

e currently bein g measure dan

dth e datawil

l b e presente di

n the nex t report . 

## 4. H Enttiraiiiniinnieinil

t Study ResyDtt s Eigh t tax ao f larva l fishe s comprise d9 5 percen t o f the tota l number s o

f tax acollecte di

n entrainmen

t sample s (Figur

e 4-la) . The taxa , liste di

n decreasin g order

o f abundance , were : unidentifie dgobie s Gobiida e (53. 2 percent) , ba

y gob y Lepidogobius lepidus (30. 4 percent) , blackey e goby Coryphopterus nicholsi (3. 0 percent) , Pacifi c staghor n sculpin Leptooottus armatus (2. 2 percent) , whit e croake r Genyonemus lineatus (2. 1 percent) , blennie s Hypsoblennius spp . (1. 9 percent) , longja

w mudsucke

r Gillichthys mirabilis (1. 2 percent) , andPacifi c herrin g Clupea pallasi (0. 9 percent) . O f the 9 5 percent , nearly 8 8 percen t wer e represente dby member s o f on e Family—Gobiidae . Thi s Family include dth e unidentifie dgobies , ba y goby , blackey e goby , andlongja

w mudsucker .

E9-053. 9 4- 1 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.6 8 4. 0 Entrainmen t an d Source Wate r Results Th e lif e histories , rang e o f

populations , an dhabita t

description s fo r

thes e tax aar e presente di n Section s 4- 3 throug h 4-10 . Informatio n i s presente do n th e tempora l an ddiuma l concentration s o f thes e tax acollecte dfro mi n front o f th e intak e o f

th e ne w combined-cycl e units . Mea n entrainmen t

concentration s (no./l,000 m) fo r al l larva l fishes separate db y uni t groups , fo r

al l survey s ar e presente di n Tabl e 4-1 . Brie f comparison s ar e mad e o f thes e curren t

dat awit h th e previou s 197 8 -198 0 entrainmen t dat a(PG&E , 1983) . Th e eigh t tax aliste dabov e ar e discusse d individuall y i n Section s 4. 3 throug h 4.10 . Impac t assessmen t

analyse s fo r

thes e eigh t

tax aar e presente di n Sectio n 6 . Si x specie s o f

Cancrida e an don e unknow n Cancer spp . megalop s wer e collecte di n entrainmen t sample s a t th e ne w C C unit s intak e (Figur e 4-lb) . Th e species , liste di n decreasin g orde r o f abundanc e were : hairy roc k cra b Cancer

jordani (29. 3 percent) , yello w roc k cra b Cancer anthonyi (19. 6 percent) , brow n roc k crab Cancer

antennarius (19. 0 percent) , dungenes s crab Cancer magister (14. 7 percent) , re droc k

cra b Cancer

productus (9. 8 percent) , slende r roc k crab Cancer gracilis (7. 1 percent) , an dunidentifie dCancer spp . (0. 5 percent) . Th e lif e histories , rang e o f

populations , an dhabita t

description s for

thes e roc k

crab s an dth e Europea n gree n crab ar e presente di n Section s 4-1 1 throug h 4-18 . Mea n entrainmen t concentration s (no./l,00 0 m 3 ) fo r al l targete dcrab species , separate db y uni t groups , fo r

all surveys ar e presente di n Tabl e 4-1 . Impac t assessmen t

analyse s fo r

al l megalopa l Cancer

spp . crab s ar e presente di n Sectio n 6 .

E9-053. 9 4- 2 MLP P 316(b ) Resource Assessmen t 4-28-200 0(a ) P.6 9
4. 0 Entrainmen t an d Sourc e Wate r Result s

Percen t Compositio n o f Entraine d Larva l Fishe s Pacifi c herrin g 0.9 % longja w mudsucke r 1.2 % ~ 1 Hypsoblennius

spp . 1.9 % ~\ whit e croake rI 2.1 % ~~

\ I Pacifi c staghor n sculpi n \ U< | 2.2 % ~ \

^Bv& blackey e gob y Z ^HB | 3.0 % ~ y

\ ^ | al l others

5.0 %

* "____f5

l I unidentifie d gobie s 53.2 %

« * 

### *«<*.V ^ 

# 3
(b ) Percen t Compositio n o f Entraine d Cance r Cra b Megalop s

unidentifie d cance rcrab s

0.5 %

dungenes s cra b 14.7 %

hair y roc k

cra b 29.3 % brow n roc k cra b 19.0 %

yello w roc k

cra b 19.6 %

slende rroc k

cra b 7.1 % Figur e 4-1 . a ) Percen t

compositio n ofth e mos t abundan t larval fis h tax aan db ) Cancer spp . megalop s collecte di n entrainmen t

survey s at

th e Mos s Landin g Powe r Plant : Marc h 199 9 throug h Februar y 2000 .

E9-053. 9 4- 3 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.7 0 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-1 . Mea

n Concentration s (#/l,00 0 m 3 ) of al l Larva l Fis h Tax aan

dMegalop s of

Cancer spp . an d Europea n Gree n Crab s Collecte di

n fron t o f th e Mos s Landing Powe

r Plan t Ne w Combined-cycl e Unit s an d Unit s 6 an d7 Intakes : March 2 , 1999 through Februar y 24 , 2000 .
Taxo n Ammodytes hexaptems Anedius lateralis Anedius spp . Atherinida e unid . Atherinops affinis Atherinopsis californiensis Aulorhynchus flavidus Bathytagus ochotensis Bathymastcridae unid . Blennioide i Brosmophycis marginato Cebidichthys violaceus Chamopsida e unid . Citharichthys sordidus Citharichthys uigntoeus Clinocouus aitalis Clupea pallasii Clupeida e unid . Oupeiforme s Coryphopterus nicholsi Cottida e unid . Coitus asper Engraulis mordax Genyonemus lineatus Gibbonsia (pp . Gillichthys mirabilis Gobiesocida e unid . Gobiesox (pp . Gobiida e - t)p e 1 Gobiida e unid . Hcxagrammidae uni d Hypsoblennius spp . larva ) 0t h • damaged larva l ru n fragmen

t larval/posl-larva ! fish . unid . Lepidogobius lepidus Leptocottus amtasus ieurogtossus stilbius Liparis jucenns Liparis spp . Oligocottus spp . Ophidiida c uni d Ophiodon elongatus Osmerida e tni d Oxyiebius pictus Parophrys vetulus Pholididaeisii d Pleuronectes bilineatus Pleuronectes isatcpis Pleuronectida e unid . Pleuronectiforme s uni d Psettichthys melanostictus Ruscarius creaser! Sardinops sagax Scorpaenichthys mtumoraaa Sebastes spp . 5>_Mi_ur r spp . V Sebasses sp p V_ D Sebastes sp p V_D c Sebastes sp p V D aVbajfrsspp . V P Sebasutobtu spp . Stenebntchius leucapsarus Stichaesda e unid . Syngnathida e tni d Syngnathus spp . Tarlelonbeania crenularis Typhlogobius cali/omienlis Cancerantennarius (megalops ) Canceranthonyi (megalopa ) Cancergracilis (megalopa ) Cancer jordani (megalopa ) Cancermagister(megalops ) Cantorproductus (megalops ) Cancerspp . (megalops ) Carcinus maenas (megalops ) Common Nam e Pacifi c san d lanc e smcothhea d sculpi n sculpin s silverside s topsmel t jacksmel t tutesnou t popey e Macksmelt ronquil s Mennie s re d hrotula monkeyfac e ee l tub e Nennie s Pacifi c sandda

b speckle d sandda

b wool y sculpi n Pacifi c herrin

g herring s herring s an

d anchovie s blackey e gob y sculpin s prickly sculpi n norlhem anchovy white croaker clini d kelpfishe s longja w mudsucker clingfishe s clingfishe s gobie s gobie s greenling s blennie s unidentifie d larva

l fishe s unidoitific d larva] fishe s unidentifie d larva

l fishe s ba y gob y Pacifi c siagho m sculpi n Califcrni a smoothtongu c slipski n Riailfish snailfishe s sculpin s cusk-cel s lingco d smell s painte d greenlin g Englis h sol e gunnel s rocksol e butte r sol e flounders flatfishe s san d sol e rouchcheck sculpi n Pacifi c sanbn e cabezo n rockfishes rockfishes rockfishe s rockfishe s rcckfish a rockfishe s thanyhead s norther n lampfis h pricklebncks pipefishe s pipefishe s blu e lantemfiri i U in d gob y FIS H TOTALS : brow n roc k oa b yello w rock cra b slende r roc

k cra b hairy roc k cra b dungenes s aa b red rock (Ta

b unidentifie d cance r crab s Europea n gree n cra b CRA B TOTALS : Coun t 19 1 4 3 5 9 4 1 9 34 9 2 1 1 3 1 19 3 1 9 8 12 9 83 0 1 4 1 3 1.63 7 124 23 4 22 3 J.10 1 1 7 88 2 1 2 2 29.21 1 2 1.16 3 6 7 27 4 2 9 14.33 7 1.43 1 I 1 6 2 4 1 1 39 1 1 0 1 4 3 I I 2 3 8 2 8 4 3 3 3 2 1 8 2 2 9 3 1 7 4 34 0 7 4 3 2 5 1 33.61 8 4 7 5 5 2 5 12 4 3 7 2 8 5 5 32 6 Stave )

Marc h 2- 3 Ne w C C Unit s N«I 2 Cl . 3 1 3 2 0

3

7 1 2 9 7 1 5 1 59 9 4 1 14 3 3 3

5

1 4 1

86 5

0 Den . 3. 2 1. 2 4. 2 26. 1

3 6

9 3 1. 2 2. 6 11 0 8. 3 19. 7 1 6 741. 8 4. 3 1 6 183. 9 42. 3

7. 3 •

1.6 6. 3 1. 2 199 9 Unit s 64 7 N = Cl . 1 2 9

3

7 3 2 9 2 1 3 44 2 3 1 3 2 2 7

5

1 1 1

1

58 3

0 1 2 Den . 0. 8 3. 1 13. 0

4. 5

10 8 3. 2 42. 4 3. 1 19. 7 651. 0 5. 2 1. 5 37. 6 41. 7

7. 8

1.3 1. 7 1. 3

1 5 Surve

y 2 Marc h S- 9 Ne w C C Units N Cl . 1 1 5 1

3 I I 4 3 143 1 I 18 2

6 7 2 4

4 7

1

3 1

46 3

1 1 = 12 Den . 1. 7 1. 2 6 9 1 5

3. 8 15 9 5 9 4. 1 196. 5 1 5 1 2 262. 9

93. 4 36 0

5. 2 9. 5

1.9

4. 3 1. 2

1. 4 199 9 Uni u 64 7 N=I 2 C tDen . 8 12. 9 4 6. 4

6 9. 8 2 3. 6 7 11. 8 7 11. 5 10 3 167. 4 3 5. 3 142 248 6

1 1 7 4 4 76. 6 1 8 29. 4

2 3. 8 1 1. 7 1 1. 4

3 4. 8

35 2

0 Survey 3

Marc h 14-15 . 199 9 Ne w C C Units N = Ct. 2 2 6

4

1 0 4 3 1 5 62 9 3 3 11 2 2 8

2 2 2

1 1

82 0 1 1

2 1 2 Den . 2. 8 3 1 8. 5

5. 6

14 0 6. 4 4 0 1 3 7. 6 95 9 1 4. 5 4 0 159. 2 4 0 1

2. 4 2. 9 3. 0

I. I 1.3

1. 3 1.3 Unit s 64 7 N = Cl . 2 1

4 6 1 3 9
7 34 5 1 2 8 15

1

1

48 7

0 1 2 Den . 3. 8 2. 2

78 8 1. 7 80. 3 13. 1 618. 5 1. 8 48. 3 23 9

1. 6

1.7 Surve y 4

Muc h 22-23.199 9 Ne w C C Uni u N = a.

7 8 1 1
7 24 4 1 1 6 4 8 4

8

33 6

0 1 2 Den .

10 3 II. B 1 3 1.6 10 3 371, 7 1. 7 1. 4 9. 3 73. 0 5. 9

11. 1 Uni u 6* 7 N = a . 2

2

3 0 1 8 7
7 19 7 1 2 2 5 1

1

7

29 1

1 1 1 2 Den . 3. 9

3 5

57 6 2. 1 12 3 1 2 6 1 3 0 360 8 1 9 2. 9 44. 1 1.6

1. 4

11. 2

1.8 Survey s

Mard l 30-31.199 9 Ne w C C Uni u N=1 2 Cl .

4

1

9 1 0 1 1 8 44 8 I 7 4 1 7

7 1

38 2

1 1 Den .

5. 2

1. 2

13. 4 15. 3 1. 7 1.5 1 3 2 689. 2 1. 2 111 4 24. 3

10. 0 1. 3

1. 5 Uni u 64 7 N«1 2 Ct . Den . 1 1. 5

4 6 6 1 3 22. 3 1 1. 7 4 6. 9 1 4 26 7 49 8 861. 4 1 1 3 2 4 44 6 1 0 18. 4 1 1.3

1 6 27. 9

2 3. 6

58 9

0

E9-053. 9 4- 4 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.7 1 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m 3 ) o f all Larva l Fis h Tax aan

dMegalop s o

f Cancer spp . an dEuropea n Gree n Crab s Collecte di

n fron t ofth e Mos s Landin g Powe r Plan t Ne w Combined-cycl e Unit s an

dUnit s 6 an

d7 Intakes : March 2 , 1999 through Februar y 24 , 2000 .
Taxo n Ammodytes hexapserus Anedius lateralis Anedius spp . Atherinidae unid . Atherinops affinis Atherinopsis californiensis Aulorhynchus

flavidus Bathylagus ochotensis Bathymasteridae taii d Blennioide i Brosmophycis marginata Cebidichthys \Holaceus Chamopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinocottus totalis Clupea patlasii Clupeida e igiid . Clupeiforme s Coryphopterus nicholsi Cottida e unid . Coitus asper Engraulis mordax Genyonemus lineatus Gibbonsia Ip p Gillichthys mirabilis Gobiesocida e unid . Gobiesox spp . Gobiida e - lyp e 1 Gobiida e iniid . Hexagramnvda e tnid . Hypsoblennius spp . larva l fish - damage d larva ) fish fragmen

t larval/post-larva

l fish. tnid . Lepidogobius lepidus Leptocottus armatus Leuroglossus slilbius Liparis fucensis Liparis spp . Oligocotlus spp . Ophidiida c taii d Ophiodon elongatus Osmerida e isti d Oxyiebius pictus Parophrys vetulus Pholidida c uni d Pleuronectes bilineasus Pteuroaeclrs isaiepis Pleurcnedida e unid . Pleuronectiforme s uni d Psettichthys melanostictus Ruscarius creaseri Sardinops sagax Scorpaenichthys mamortuus Sebastes spp. Sebastes spp . V Sebastes sp p V__

D Sebastes spp . V_D e Sebastes spp . V D Sebastes spp . V P Sebastolobus spp . Stenobrachius leucopsanu Slkhaeida e uni d Syngnathidae uni d Syngnathus spp . Tarieumbeania crenularix Typhlogobius caH/oeniensis Canceramennariits (megalops ) Canceranthonyi (megalops ) Cancergracilis (megakps ) Cancer jordani (megalops ) Cancermagister(megalops ) Cancerproductus (megalopa ) Cancerspp . (megalops ) Carcinus maenas (megalops ) Commo n Nam e Pacifi c san d lanc e smoothhea d sculpi n sculpin s silverside s topsmel t jacksmel l tutesnoul popey e biacksmel l ronquil s blennie s redtrotul a menkeyfac e ee l lub e blennie s Pacifi c sandda

b speckle d sandda

b wool y sculpi n Pacifi c borin g herring s herring s an

d anchovie s blackey e gob y sculpin s prickly sculpi n norther n anchovy white croaker clini d kelpfishe s longja w mudsucker clingfishe s clingfishe s gobie s gobie s greenling s Mennie s unidentifie d larva

l fishes unidentifie d larva

l fishe s unidentifie d larva

l fishes bay gob y Pacifi c staghor

n sculpi n Californi a smoothlongu e slipski n snailfis h snailfishe s sculpin s cusk-eel s lingco d smcl u painte d greenlin g Englis h sate gunnel s rocksol e culle r sol e flounder s flatfishe s san d sol e rouchdiee k sculpi n Pacifi c sardin e cabezo n rockfishe s rockfishe s rockfishe s rockfishe s rockfishe s rockfishe s thomyhead s norther n lampfu h pricklebnck s pipefishe s pipefishe s blu e lanlemfu h blin d gob y FIS H TOTALS : brow n roc k cra b yello w roc

k cra b slende r roc

k cra b hair y roc k cra b dungenes s cra

b red roc k CTab unidentifie d cance r crab s Europea n gree n cra b CRA B TOTALS : Swvey 6 April 4-3 . 199 9 Ne w C C Uni u N o 1 2 a .

3

1 2

4 1 8 6 1 1 0 48 9 1 40 1 3

8 2

1

3

96 4 1

1 Den .

4. 2

17. 3

6 6 25. 9 9 4 1.6 1 7 0 722. 8 1. 2 485. 5 6 9

9. 4 3. 4

1.7

4. 7

1. 6 Uni u 64 7 N = a . i 4

4 2 1
7 I S 2 7 1 5 30 3 2 2 3 9

5

1

43 1

0 1 2 Den . 1 5 6. 4

73. 8 I. I 10 4 29. 7 2. 6 11. 2 1 5 7. 5 494. 3 2. 8 36. 7 13. 5

6 8

1.9 Surve y 7

April 13-16.199 9 Ne w O C Uni u Uni u 6* 7 N=1 2 N = a .

12 1 I I 1 6 1 8 41 9 4 3 0 3

4 2

1

53 9

2 2 4 Den . Cl .

1 16 1 1 9 1. 4 2 14 6 8 1.9 8. 4 3 1 4 1 10. 7 1 1

1 572. 7 33 1 5 1 41 0 3 4. 1 3

58 0 3 8

1. 4

2

42 9

2. 7 1 1 8 1 12

Den .

I S 30 6 3. 5 12. 6 8 6 1. 8 17 0 1. 3 526. 3

7. 6 7. 6

60. 7

3. 7

1. 6 Survey 8

Apri l 22-23.199 9 Ne w C C Uni u Uniu6& 7 N Cl . 1 3

8

5 4 2 3 5 1 1 6 49 7

16 5 6

2

78 1

6 1 7 t. 12 N s Den . Cl . 1. 4 2 4. 3 2

I

10. 8 2

79. 7 3 9 2 9 1 4 47. 4 2 4 1. 4 1. 1 2 9. 1 3 717. 9 25 9

1 229. 8 4 9 8. 3 1

2. 6 1

1 1

39 3

7. 8 2 1. 2 2 1 2

Den . 3. 2 3. 1 1. 7

3. 3

67. 3 2. 0 6. 7 40. 2 3. 4 5. 4 459. 7 1. 7 86. 6 1.9

1 6

1. 6 1.5

3. 4 Surve y 9

April 23-30 . 199 9 Ne w C C Uni u Uniu6& 7 N=I 2 N=I 2 Cl . Den . Cl . Den ,

1 1 4

1 1.

4 2 4 39. 1 3 1 52. 7 2 3. 0 14 23. 7

3 4 6 3 4 7 9 15. 3 28 6 414. 2 21 9 378. 1 1 I I 1 1. 8 5 4 75. 1 2 5 36 9

1 1.9

3 4. 2 1 0 16. 9

1 1.

4

37 5 31 4

1 1. 2 1 1. 6 1 1 Surve y 1 0 Ma y 6-7 . 199 9 Ne w C C Uni u Unit s 64 7 N = Cl . 1

3 8

2 5 6

6 50 9 1 15 2 1

1

1 5

63 8

2 2 1 2 N=I 2 Den . Cl . 1.3 1

1

63. 8 5

3. 7 8 95. 3 2 0

1

11. 2 2 872. 6 27 4 1 9 1 22. 3 7 3. 2 2 1.6 1 1.3

1

1.9 8. 3

32 4

2. 7 4

4 Den . 1. 9 1. 6

8. 7

13. 8 37. 0 1 9

4. 1 498. 3 1.9 12 3 4. 2

2. 3

1. 9

6. 7

E9-053. 9 4- 5 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.7 2
4. 0 Entrainmen t an d Sourc e Wate r Result s Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m) o f al l Larva l Fis h Taxa , Megalop s o

f Cancer spp . an dEuropea n Gree n Crab s Collecte di

n fron t of the Mos s Landing Powe

r Plant Ne w Combined-cycl e Unit s an dUnit s 6 an

d7 Intakes : March 2 , 199 9 through Februar y 24 , 2000 . Taxa ) Ammodytes hexapterus Anedius lateralis Anedius spp . Atherinidae tmid . Atherinops affinis Atherinopsis californiensis Aulorhynchus

ftm-idus Bathylagus ochotensis Bathymastcridae uni d Blennioide i Brosmophycis marginasa Cebidichthys violaceus Chaenopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinocotlus analis Clupea pallasii Clupeida e uni d Clupeifisme s Coryphopterus nicholsi Cmtidae uni d Coitus asper Engraulis mordax Genyiinemus lineatus Gibbtmsia sp p Gillichthys mirabilis Gobiesocida e unid . Gobiesox sp p Gobiida e - type 1 Gobiida e unid . Hcxagramnudne uni d Hypsoblennius sp p larva l fish - damage d larva l fis h fragmen

t larval/posl-larva

l fish. unid . lepidogobius lepidus leptocottus ormolus leuroglossus stilbius Liparis fucensis liparis spp . Oligoeoaus spp . Ophidiida c uni d Ophiodon elongatus Osmeridae uni d Oxyiebius pictus Parophrys vetulus Pbotididae uni d Pleuronectes bilineasus Pleuronectes isaiepis Pleuronectidae unid . Pleuronectiforme s uni d Psettichthys melanostictus Ruscarius creased Sardinops sagax Scorpaenichthys marmoratus Sebastes spp . Sebastes spp . V Sebastes spp . V_ D Sebastes spp . V_D e Sebastes spp . VD Sebastes spp . V P Sebastolobus spp . Slenobrachius teucopsarus Slichaeida e uni d Syngnathidae uni d Syngnashus spp . Tarletonbeania crenularis Typhlogobius califomiensis Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancermagister(megalops ) Cancerproductus (megalops ) Cancerspp . (megalops ) Carrrm u maenas (megalops ) Commo n Name Pacifi c san d lanc e smoolhhea d sculpi n sculpin s silverside s topsmel t jacksmel t tubesnou t popey e Macksmel

t rcnquil s Ncnn.e s redtrolul a monkeyface ee l lub e blennie s Pacifi c sandda

b speckle d sandda

b wool y sculpi n pacifi c herrin

g herring s herring s an d anchovie s blackey e gob y sculpin s prickly sculpi n noriho n andiov y whit e croake r clini d kelpfishc s Icngja w mudsucke

r clingfishe s clingfishe s gobie s gobie s greenling s blennie s unidentifie d larva

l fishe s unidentifie d larva

l fishe s unidentifie d larva

l fishe s ba y gob y Pacifi c slagho m sculpi n Calilomi a smouthtcngu e slipski n snailfis h snailfishe s sculpin s cusk-eel s lingco d smeJ U painted freenlin g Englis h sol e gunnel s roc k sol e butte r sol e flounder s flatfishe s sand sol e rouchcheek sculpi n Pacifi c sardin e cabezo n rockfishe s rockfishe s rockfishes rockfishes rockfishe s rockfishes thomyhead s northe m lampfis h prickleback s pipefishe s pipefishe s blu e lantanfis h blin d gob y FIS H TOTALS : brow n rock cra b yello w rock cra

b slende r roc

k cra b hair y roc k cra b dungenes s (Ta

b red roc k cra b unidentifie d cance r crab s Europea n gree n (Ta b CRA B TOTALS : Surve y Ma y 13-1 4 Ne w C C Uni u N=1 2 Cl . Den . 1 1 4 1 1. 3

6 8 6 1 0 14 3

9 12. 2 55 6 757. 5 1 1. 2 1 1 6 4 5 1 27 34. 9 5 6 4 1 1. 1

4 4. 7

6 7. 0 1 I. I

63 3

2 2. 3 2 I I

. 199 9 Unit s 64 7 N = a . i

i

1 9 2 1 1 1 2 21 8

2 1 2

1

27 0

0 1 2 Den . 1.5

1 3

27. 2 2. 5 1. 3 I S 1. 5 3 0 323. 8

32. 5 2. 5

1. 2 Surve y 1 2

Ma y 20-21 . 199 9 Ne w C C Uni u Uni u 64 7 N Cl . 1 1 1

12

1 7 1 1 1 6 18 0 3 3 3 1 1

1

2

31 6

8 7 1 3 = 1 2 N = Den . Cl . 1. 6 1 1. 6 1. 6 1

16. 5 2

1. 6 12 2 9 9 2 15 3 1 6 1 6 1 8 8 1 4 248. 7 125 4. 8 4 4. 1 1 41. 6 4 4 1.3

1.3 3

2. 9 1

36 4

10. 1 8. 3 0 1 2

Den . 1. 5 1. 6

3. 0

18. 4 3. 1 230. 5

1.5 21. 1 185. 8 5 6 1. 4 65. 9

4. 6

1. 3 Survey 1 3

Ma y 27-2 8 Ne w C C Uni u N=1 2 Cl . Den . 1 1.

7 1 1.3

2 9 3 4 1

2 2. 7 1 3 18. 3 1 1.

2

4 5. 9 40 4 563. 7 2 3 1 3 1 4 3 0

6 7. 3

49 4

1 1.

2 1 .199 9

Uni u 64 7 N = Cl . 2

1 7 3 1 6 13 4 1 2 2 1

9

19 6

1 1 12 Den . 3. 4

24. 9 4. 5 1 6 9 0 211. 2 1 6 2. 7 33 6

13. 0

1.3 Surve y 1 4

Jun e 3- 4 Ne w C C Uni u N = a. 2

9

6 3 1 1 3 1 0 64 9 5 8 4

4 1

I

82 6

5 1 6 1 2 Den . 2. 5

11. 2

9. 1 63. 2 I. S 3. 7 14 4 845. 3 7. 6 109. 9

5. 5 1. 3

1. 5

6. 3 1. 2 199 9 Uni u 64 7 N = C l
1 1

12 1 7

2 1 3 22 1 6 1 I I 1

1

1 28 8

2 2 1 2 Den . 1. 5 1. 3

20 6 25. 4

2. 9 19. 2 341. 3 9 2 1 8 13. 6 1.5

1.3

1.5

2. 7 Survey 1 3

Jun e 10-1 1 Ne w C C Uni u N Cl . 2 2

7 5 9

2 2 2 78 3 1 2 2 4 6 9

96 4

0 = 1 2 Den .

3 0 2. 9

9 4 77. 3

34. 7 2. 4 116 4 6 17. 3 3. 2 6 8 85. 9 199 9 Unt U 64 7 N = a . 1

1

1 0 3 3

1 2 1 29 0 6 1 4

1 1

37 9

0 12 Den . 1 6

1. 7

1 3 0 49 0

2 1 42. 3 550. 0 10. 1 21. 7

1. 7 1.8

E9-053. 9 4- 6 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.7 3 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m 3 ) o f al l Larva l Fis h Tax aandMegalop s o f Cancer spp . an dEuropea n Gree n Crab s Collecte di

n fron t o f the Mos s Landin g Powe

r Plant Ne w Combined-cycl e Unit s an

dUnit s 6 an

d7 Intakes : Marc

h 2 , 1999 through Februar

y 24 , 2000 .
Taxo n Ammodytes hexapterus Anedius lateralis Anedius spp . Atherinida e unid . Atherinops affinis Atherinopsis californiensis A ulorhynchus flavidus Bathylagus ochotensis Baihymasierida e unid . Blennioide i Brosmophycis marginata Cebidichthys violaceus Chaenopsida e unid . Citharichthys sordidus Citharichthys • stigmaeu s Cl inor onus anal

it Clupea pallasii Clupeida e unid . Clupe i frames Coryphopterus nicholsi Crttida e unid . Coitus asper Engraulis mordax Genyonemus lineatus Gibbtmsia spp . Gillichthys mirabilis Gobiesocida e uni d Gobiesox sp p Gobiida e • lyp c 1 Gobuda e unid . Hcxagramrnhla e uni d Hypsoblennius spp . larva l fis h - damage d larva l fis h frapmem larvnl/pnsl-l.irvn l fish . unid . Lepidogobius lepidus LeptocOltus armatus Leuroglossus stilbius Liparis fucensis Liparis spp . OUgocottus *pp. Ophidiida c tni d Ophiodon elongatus Osmerida e untd . Oxyiebius pic tus Parophrys vetulus Pholididaeunid . Pleuronectes bilinearus Pleuronectes isaiepis neuroncclida e unid . Reuronectiforme s unid . Psettichthys melanostictus Ruscarius crraseri Sardinops sagax Scorpaenichthys manrusratus Sebastes spp . Sebastes spp . V Sebastes spp . V_ D Sebastes SR

X V_D e Sebasiesspp V D Sebastes spp . V P Sebastolobus spp . Stenobrachius Uucopsana Stichaeida e uni d Syngnathida e unid . Syngnathus spp . Tarletonbeania crenularis Typhlogobius californiensis Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancermagister(megalops ) Cancerproductus (megalops ) Cancer spp . (megalops ) Carcinus maenas (megalops ) Commo n Nam e Pacifi c san dlanc e srnoolhhea d sculpi n sculpin s silverside s topsmel t jacksmel t tubesnou t popey e btacksmel i ronquil i blennie s re dtrotul a monkeyfac e ee l tub e blennie s Pacifi c sandda b speckle dsanddab vrooly sculpi n Pacifi c herrin g herring s herring s an danchovie s Nackey e gob y sculpin s pnetl y scu t

pi n norther n anchov y whit e croake r clini dkelpfishe s longja* - mudsucke r clingfishe s clingfishe s gobie s gobie s greenling s blennie s unidentifie dlarva ) fishe s unidentifie d larva l fishe s unidentifie d larval fishe s ba y gob y Pacifi c staghor n sculpi n Californi asmoot

h tongu e slipski n snailfis h snailfishe s sculpin s cusk-ee l s lingco d smell s painte dgreenlin g Englis h sol e gunnd s roc k sol e butte r sol e flounder s flatfishe s san d sol e rouchchce k

sculpi n Pacifi c sardin e cabezo n rockfishe s rockfishe s rockfishe s rockfishe s rockfishe s rockfishe s thomyhead s norther n lampfis h pricklebad u pipefishe s pipefishe s blu e laniemfis h Min d gob y FIS H TOTALS : brow n roc k

cra b yello w roc k

cra b slende r roc k cra b hair y roc k

cra b dungenes s cra b re d roc k cra b unidentifie dcance r

crab s Europea n gree n cra b

CRA B TOTALS : Surve y 1 6 Jun e 17-18 . 199 9 Ne w C C Uni u Uniu6A 7 N=M * N=I 2 Cl . Den . Ct . Den .

1 1. 3

7 12. 3 5 9. 3 4 2 63. 3 1 2 19. 4

1 1. 0 1 1 8 4 6 5 23 1 313 9 10

4 174. 2 1 7 25. 0 6 10. 3

1 1.2 8 0 93. 8 2 7 38. 9 1 1 6 5 6. 6 2 3. 2

1 1. 3

38 6 16 2

1 1 3 0 1 Surve y 1 7 Jun e 24-25 . 199 9 Ne w C C Unit s Uni u 6* 7 N Ct .
1

6 4 2
2 1 6 69 4 2 0 4 5 1 16 2 1

4 1

1

96 0

0 >I 2 N = Den . Cl .

2 1. 2

8. 3 1 57. 3 1 5

1 2. 4 20. 4 1 4 892. 7 32 1 26. 7 7 5. 2 2 6. 8 3 1. 4 210 6 5 7 1. 3

5 1 6 1. 4

1. 2

42 9

0 1 2 Den . 3. 1

1. 4 22. 2 1. 3

17. 2 426 4 9. 8 3. 0 4. 4 78. 8

8 1 Surve y 1 8

Jul y 12-13 . 199 9 Ne w C C Unit s Uni u 64 7 N=I 2 N = Ct . Den . Ct . 9 10. 0 2

1

2 2 3 26. 9 7

1

6 9. 3 7 8 8 141 4 12

7 3 2 42. 2 2 5 2 3. 3 1 6 1 68. 6 8 1 i o

22 2 18 1

1 1 1. 0 1 1 1 2

Den . 3. 1 2. 5

3. 0 12. 9 1. 3

13. 0 238. 7 39. 8 1. 7 12. 5

1. 7 Surve y 1 9

Jul y 29-30 . 199 9 Ne w C C Uni u N=1 2 Ct . 1 2

1 2

6 9 7 5 0 2 1 5 8

1 23 0

0 Den . 1. 6 3, 3

21. 0

11. 2 177. 3 85. 1 3. 4 1. 7 103. 5

1. 6 Unit s 6& 7 N = Ct . I I

1

1 5

1 4 24 7 4 4 2 2 7 8 I

1

40 7

0 1 2 Den . 1. 5 1. 8

1. 3

25. 0

20. 9 417. 3 66. 8 3. 6 2. 8 108. 2 1. 7

1. 3 Surve y 2 0

Augus t 12-13 . 199 9 Ne w C C Uni u Unit s 64 7 N=1 2 N = 1 2 Ct . Den . Q . Den . 1 1. 4

2 2. 9 3 4. 9 1 3 18. 5

6 10. 7 1 0 14. 7 2 7 42. 8 13 6 193. 4 4 2 69. 2 10 3 142. 1 1 1 6 6 6 99. 7 1 3 21. 1

I 1. 4

14 7 27 7 1 1. 1 1 1. 5

1 1. 2 1 2
•On e sampl e voide ddurin g laboratory processing .

E9-053. 9 4- 7 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.7 4
4. 0 Entrainmen t an d Sourc e Wate r Result s Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m 3 ) o f all Larva l Fis h Tax aan

dMegalop s o

f Cancer spp . an dEuropea n Gree n Crab s Collecte di

n fron t o f the Mos s Landin g Powe

r Plant Ne w Combined-cycl e Unit s an

dUnit s 6 an

d7 Intakes : Marc

h 2 , 1999 throug

h Februar y 24 , 2000 .
Taxo n Ammodytes hexapterus Artedius lateralis Artedius spp . Atherinida e unid . Atherinops affinis Atherinopsis californiensis Auiorhynchus

flavidus Bathylagus ochotensis Balhymasterida e uni d Blennioide i Brosmophycis marginata Cebidichthys violaceus Chacnopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinocottus analis Clupea pallasii Clupeida e unid . Clupeiforme s Coryphopterus nicholsi Cottida e uni d Cottus asper Engraulis mordax Genyonemus lineatus Gtbbonsia sp p Gillichthys mirabilis Gobicsocida c unid . Gobiesox spp . Gobiidae - lyp c I Gobiida e unid . Hexagramirtida c uni d Hypsoblennius spp . larva l fish - damage d larva l fish fragmen t larval/posl-larva l fish, uni d lepidogobius lepidus Leptocoaus armatus Ijeuroglossus stilbius Liparis fucensis Liparis spp . OUgocottus spp . Ophidiida c uni d Ophiodon elongatus Osmerida e unid . Orytebms pictus Parophrys vetulus fltotidida e unid . Pieuronecies bilineatus Pleuronectes isotepis Pleuronectida e unid . Pleuronectiforme s uni d Psettichthys melanostictus Rustarius creaseri Sardinops sagax Scorpaenichihys marmoratus Sebastes spp . Sebastes spp . V Sebastes spp . V. D Sebastes spp . V_D e Sebastes spp . V D Sebastes spp . V P Sebastolobus spp . Stenobrachius leucopsams Slichaeida e unid . Syngnathidae unid . Syngnathus spp . TaHetonbeania crenularis Typhlogobius californiensis Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancermagister(megalops ) Cancerproductus (megalops ) Cancer spp . (megalops ) Carcinus maenas (megalops ) Commo n Nam e Pacifi c san dlanc e smoothhea d sculpi n sculpin s silverside s topsmel t jacksmel t tubesnou t popey e Nacksmel i ronquil i blennie s redbrotul a monkeyfac e ee l tub e blennie s Pacifi c sandda b speckle dsandda b wool y sculpi n Pacifi c herrin g herring s herring s an danchovie s Nackey e gob y sculpin s prickl y sculpi n norther n anchov y whit e croake r clini dkelpfishe s longja w mudsucke r clingfishe s clingfishe s gobie s gobie s greenling s Nennic * unidentifie dlarval fishe s unidentifie dlarval fishe s unidentifie dlarva l fishe s bay gob y Pacifi c staghor n sculpi n Californi asmoothtongu c slipski n (nailfis h snajlfishe s sculpin s cusk-eel s lingco d smelt s painte dgreenlin g Englis h sol e gunnd s rocksol e butte r sol e flounders flatfishe s san d sol e rouchchee k

sculpi n Pacifi c sardin e cabezo n rockfishe s rockfishes rockfishe s rockfishe s rockfishe s rockfishe s ihcmyttead s norther n lampfis h prickleback ! pipefishe s pipefishe s blu e lanter n fish blin djw* y FIS H TOTALS : brow n roc k

cra b yello w roc k

cra b slende r roc k cra b hairy roc k

cra b dungenes s cra b re droc k cra b unidentifie dcance r

crab s Europea n gree n cra b

CRA B TOTALS : Surve y 2 1 Aug . 3 1 -Sep . 1.199 9 Ne w C C Uni u N=I 2 Ct . Den . 1 4 20. 7

1 1. 5 1 1 4 6 4 88. 8

7 10. 3
11 1 159. 3 14 3 210. 1 1 1 4 14 3 164. 6 3 4. 4

2 2. 9

1 1.

4 I 1. 0 49 4
2 2. 9

2 Uniu6& 7

N o Ct . 5 8 I

1 1 2 4 0

2
14 0 11 8 3 5 5 1

37 7
4

4 1 2 Den . 8. 8 11. 0 1. 5

1. 2 1 4 3. 1 57. 5

3. 3 195. 6 172. 1 4, 0 74. 9 1. 4

6. 3 Surve y 2 2

Septembe r

16-17 . 199 9 Ne w C C Uni u N=1 2 Ct . Den .

8 12. 1 1 1. 5 7 5 111. 2 1 1.

4 7 10. 3 29 4 438. 0 18 2 270. 8 1 1. 6 192 277. 1

1 1. 5

2 2. 9 76 4 6 9. 1 7 10. 5

1 3 Uni u 6A 7

N=1 2 Cl . Den .

2 2. 7
1 1.2 5 7 77. 1

1 4 19. 5
42 2 578. 4 15 4 211 4 2 2. 6 17 6 241.2

2 2. 3

I 1. 2

83 1

0 Surve y 2 3

Sep . 30-Oc t

1 . 199 9 Ne w C C Uni u Uni u 64 7 N=I 2 N = Cl . Den . Ct .

2 2 3. 4 2

1 7 28. 4 4 1 1. 5 1

1 7 11. 8 6 107 179. 9 17 1 2 2 37. 2 2 0

1 2 3 4 2 11 8 206. 6 9 7

27 6 30 7 3 9. 2 6

5 3 2 63. 0 5 4 1 2. 2 1 3 8 6 6 1 2 Den .

2. 9 2. 9

5 8
1 9 1. 0 8. 9 252. 1 29. 8 1. 4 2. 9 144. 3

10 8 8. 9 101. 1 1. 9 Surve y 2 4

Octobe r 14-15 , 199 9 Ne w C C Uni u Uniu6& 7 N=I 2 Nal 2 Ct . Den . Cl . Den .

I 2. 6

2 3. 3 5 9 89. 4 9 1 128. 1

2 2. 6

1 8 27. 3 7 8. 7
27 7 428. 6 40 5 524. 8 3 9 60. 7 3 3 42. 5

4 5 4 16 3 234. 8 19 4 226. 2 4 6. 4 2 2. 3

1 2. 6

56 2 74 0 3 4. 1 3 6. 9 4 5. 0

8 4 Surve y 2 3 Oaobe r 2 8 - 29.199 9 Ne w C C Uni u UniU6A 7 N = a

i 5 2 0 1

1 9 18 6 1 3 2 34 5 3

39 5

0 1 2 N = 1 2 Den . Ct . Den .

2 2. 6

1. 7 8 2 8 11. 9 3 3 1 1 0 15. 4 1. 8 2 2. 9 32. 3 1 7 27. 0 308. 9 18 2 272. 7 20. 8 9 14 3 2. 7 471. 5 21 5 331. 0 4. 6 5 6. 7

43 0

0

E9-053. 9 4- 8 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.7 5 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m 3 ) o f all Larva l Fis h Tax aan

dMegalop s o

f Cancer spp . an dEuropea n Gree n Crab s Collecte di

n fron t of the Mos s Landing Powe

r Plant Ne w Combined-cycl e Unit s an

dUnit s 6 an

d7 Intakes : Marc

h 2 , 199 9 through Februar

y 24 , 2000 . Taxo n Ammodytes hexapterus Anedius lateralis Anedius spp . Atherinidae latid . Atherinops affinis Atherinopsis cali/omiensis Auiorhynchus

flavidus Bathylagus ochotensis Balhymasterida c 1s

ti d Blennioide i Brosmophycis marginata Cebidichthys violaceus Chamopsida e tnid . Citharichthys sordidus Citharichthys stigmaeus Clinocottus analis Clupea pallasii Clupei-la e unid . Clupeiforme s Coryphopterus nicholsi Cottida e unid . Cottus asper Engraulis mordax Genyonemus lineatus Gibhonsia sp p Gillichthys mirabilis Gobiesocida e unid . Gobiesox spp . Gobiida e - typ e 1 Gobiida e unid . Hexagrammidae uni d Hypsoblennius spp . larva l fis h - damage d larva l fis h fragmen

t larval/posl-larva ] fish . i_nid . Lepidogobius lepidus Leptocottus armatus Leuroglossus stilbius Liparis fucensis Liparis spp . OUgocottus spp . Ophidiida c unid . Ophiodon elongalus Osmerida e unid . Oxyiebius pictus Parophrys vetulus PtKSidida

c uni d Pleuronectes bilitteatus Pleuronectes isaiepis Pleuronectida e tnid . Pleuronectiforme s unid . Pseaiehlhys melanostictus Ruscarius creaseri Sardinops sagax Scorpaenichthys marmoratus Sebastes spp . Sebastes spp . V Sebastes spp . V_D Sebastes (pp . V_D e Sebastes spp . VD Sebastes spp . V P Sebaslotobia spp . Stenobrachius leucopsants Slichacida e unid . Syngnathida e tni d Syngnathus Eft) . Tarletonbeania crenularis Typhlogobius californiensis Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancermagister

(megalopa ) Cancerproductus (megalops ) Cancerspp . (megalops ) Carcinus maenas (megalops ) Commo n Nam e Pacifi c san d lanc e smoothhead sculpi n sculpin s silverside s topsmel t jacksmel t lubesnoul popey e blacksmel t ronquil s blennie s red brolula monkeyfac e ee l tub e Mennies Pacifi c sandda

b speckle d sandda

b wool y sculpi n Pacifi c heiTin

g horing s herrings an

d anchovie s Nackey e gob y sculpin s prickly sculpi n norther n anchovy whil e a*oake

r clini d kelpfishe s longja w mudsucker clingfishe s clingfishe s gobie s gobie s greenling s blennie s unidentifie d larva

l fishe s unidentifie d larva

l fishe s unidentifie d larva

l fishe s ba y gob y Pacifi c staghorn sculpi n Califomi a smoothtongu c slipski n snailfis h snaiirishc s sculpin s cusk-ccl s lingco d smelt s painte d greenlin g Englis h rol e gunnel s rocksol e butte r sol e flounders flatfishe s san d sol e roudtchec k sculpi n Pacifi c sardine cabexo n rockfishe s rockfishe s rockfishe s rockfishe s rockfishe s rockfishe s Ihcmyhead s norther n lampfis h pricklcrjock

s pipefishe s pipefishe s blu e lanlemfis h blin d gob y FIS H TOTALS : brow n rock cra

b yello w rock cra b slende r roc

k cra b hair y rock cra

b dungenes s era

b re d rock cra

b unidentifie d cance r crab s Europea n gree n cra b CRA B TOTALS : Survey 2 6 Novembe r 4 Ne w C C Units N=1 2 Q
2 1 I

1 1 2 0 2 6 1 3 0 1.30 5 8 6 45 7 9

1

1.83 1 1 1 2 Den . 2. 9 1. 4 1. 2

1 6 1. 4 28. 0 2. 6 8. 6 1. 2 4 3 1 1798. 7 12. 0 8 8 655. 2 13 2

1. 4

1 4 1. 4 -5,199 9 Uni u 6* 7 N = Ct. 1

2 1 1 6 6 27
77 2 6 3 14 2 1 4

1

1

1 99 3 2

1 3 12 Den . I I

2. 7 1.3 21. 0 7, 6 35 5 1018. 9 8. 2 3 9 18 8 9 18. 3

1. 2

1 4

1. 1

2. 8

1 3 Survey 2 7

Novembe r 1 1 • 12 . 199 9 Ne w C C Units Units 64 7 N=1 2 N=I 2 O . Den . Cl . Den .

1 1. 2

17 0 280 8 2 6 3 6 1 1 1 9 8 13. 6 1

3 18. 6 1 8 28. 4 2 6 38. 3 49 3 788. 5 48 2 719. 4 1 2 19 7 1 1. 2 1 1.5 3 4 3 60 9 1080. 8 49 5 698. 4 1 0 16 0 2 2 32 8

1.322 1,06 9 3 5. 1 2 3. 4 1 1.7 1 1.7

7 0 Survey 2 8 Novembe r 18 - 19.199 9 Ne w C C Uni u Umts 64 7 N=I 2 a . 4 1

1 2 4 7 4 1 3 56 8 6 5 1.68 9 12

2.32 5 3 2 1 1 1 8 N = Den . Ct. 4.8 , 1. 4

1 18. 1 2 6. 0 9. 4 3 6 1 18 9 12 851. 5 34 4 8. 8 2 8. 3 2 2668. 2 24 8 16. 1 6

62 0 3. 9 3 2. 4 1 1. 2 1. 2 1 1. 4 5 1 2

Den .

1. 7 2. 4 5. 2 16. 8 488. 3 3. 1 2. 7 382. 4 9. 2

3. 7 1. 2 1. 2 Surve y 2 9 Novembe r 2 2 Ne w C C Uni u N = Ct.

3

4 6 8 1 3 20 8 1 1 53 6 1 8

79 8 1 1

2 1 2 Den .

5. 8

7 6 9 8 14 3 24. 4 369 5 1 9 1 8 905. 7 33. 4

1 9 1. 9 -23.199 9 Uni u 6* 7 N = a 1 0 1 2

1 2 14 6 3 1 44 5 1 12 13 8 5 5

72 7 1

1 12 Den . 15. 9 20 4

1.8 3. 2 25 8 10 9 53. 3 749. 5 1. 4 19 4 244. 7 92. 3

1.7 Survey 3 0

Decemher 2 Ne w C C Uni u N=I 2 Cl . 1 5 4 1

1 1 2 5 2 0 1 9 39 0 1 5 8 53 4 3 6

1 1.07 9 1 2 1 1 1 6 Den . 22. 2 53. 6

1.3 17. 0 7. 0 28 8 1. 5 12 4 545 0 1. 3 7, 6 11. 7 769. 2 50. 9

1.3 1.3 3. 2 1.3 1. 3 1. 3 •3.199 9 Uni u 6* 7 N=I 2 Ct. 1 4 3 0

3 1 0 3 1 3 5 2 5 66 3 1 6 1 3 33 2 2 9 2 0

1

1 1.16 9 1 1 1 1 4 Den . 16. 5 34 9

3. 7 9. 8 3 6 15. 5 5. 8 28. 6 745. 5 I. I 6 6 15 6 386 3 33. 5 29. 5

1. 6

1. 2 I. I 0 8 1. 3 I. I

E9-053. 9 4- 9 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.7 6 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m) o f al l Larva l Fish Tax aandMegalop s of Cancer spp . an dEuropea n Gree n Crab s Collecte di

n fron t o f th e Mos s Landing Powe

r Plan t Ne w Combined-cycl e Unit s an

dUnit s 6 an

d7 Intakes : March 2 , 199 9 through Februar y 24 , 2000 .
Taso i Ammodytes

hexapterus Anedius lateralis Anedius spp . Atherinida e unid . Atherinops

affinis Atherinopsis

californiensis Auiorhynchus

flavidus Bdlhylagus

ochotensis Bathymasterida e uni d Blennioide i Brosmophycis

marginata Cebidichthys

violaceus Otaenopsidaeunid. . Citharichthys

sordidus Citharichthys

stigmaeus Clinorottus

analis Clupea pallasii Clupeida e uni d Gtrpeiforme s Coryphopterus

nicholsi Cottida e uni d Conus asper Engraulis

mordax Genyonemus

lineatus Gibbonsia

sp p Gillichthys

mirahilis Gobiesocida e unid . Gobiesox

sp p Gobiida e - typ e 1 Gobiida e uni d Hesagrammida e uni d Hypsoblennius

spp . larva l fis h - damage d larva l fis h fragmen l larval/poRI-larva l fish , uni d Lepidogobius

lepidus Leptocottus

armatus Leuroglosxus

slilbiut Liparis fucensis Liparis spp. Oligocoaus

sjjp . Ophidiida e tni d Ophiodon

elongatus Osmerida e uni d Oxyiebius

pictus Parophrys

vetulus Pholitbda c mi d Pleuronectes

bilinealus Pleuronectes

isaiepis Pleuronectida e unid . Plcuraiectirorme s unid . Psettichthys

melanostictus Ruscarius

ereaseri Sardinops

sagax Scorpaenichthys

marmoratus Sebastes

spp . Sebastes

spp . V Sebastes

spp . V_ D Sebastes

spp . V_.D e Sebastes

spp . V D Sebastes

spft. V P Sebaslotoous

stn . Stenobrachius

teucopsarus Slicfcacida e uni d Syngnathida e tni d Syngnathus

spp . 7an>lon_»ranj' d crenularis Typhlotobius

califomiensis Cancer antennarius

(megalops ) Cancer anthonyi

(megalqx ) Cancer gracilis

(megalops ) Cancer jordani (megalops ) Cancer magister

(megalops ) Cancer productus

(megalqx ) Cancer spp . (megalqts ) Carcinus

maenas

(megalops ) Commo n Nam e Pacifi c san d lanc e smoothhea d sculpi n sculpin s silverside s topsmel t Jacksmel t lubesnou t popey e blacksmel l rcsiquil s blennie s re d trotul a monkeyfac e ee t tub e blennie s Pacifi c sandda b speckle d sandda b wool y sculpi n Pacifi c herrin g herring s herring s an d anchovie s Nackey e gob y sculpin s prickl y sculpi n norther n anchov y whit e croake r clini d kelpfishe s longja wmudsucke r cl_ngfist.e s clingfishe s gobie s gobie s granting * Ncnnic s unidentifie d larva l fishe s unido.lir.c d larva l fishe s unidentifie d larva l fishe s ba y gob y Pacifi c slagho m sculpi n Californi a smoothlangu e slipskt n snailfis h snailfishe s sculpin s cusk-eel s lingoo d smel u painte d greenlin g Englis h sol e gunnel s roc k sol e butle r sol e llounder s flatfishe s san d sol e itsjch<_hcc k

sculpi n Pacifi c sardin e cabezo t rockfishes rockfishe s rockfishe s rockfishe s rockfishe s rockfishes thor n yhead s northe m IsirpTis h pricklcback s pipefishe s pipefishe s blu e lanlemfis h blin d gob y FIS H TOTALS : brow n rock

cra b yello wrock

cra b slende r rock

cra b hair y rock

cra b dungenes s cra b re d rock

cra b unidentifie d cance r crab s Etropea n gree n cra b

CRA B TOTALS : Surve y 3 1 Decembe r 9 Ne wC C Uni u N = 1 2 C l Den .

7 11 6

5 8 1 8 13. 5 5 7. 9 1 7 24. 8
32 1 532. 5 1 1 6 1 1. 8 1 1 6 48 2 772. 7 1 3 19 8

4 5. 7

5 7. 5

87 0 6 8. 4 1 I- S 1 1. 3 8 10 . 199 9

Uni u 6& 7 N = C l

2 0

3

6 2 1 4 5

22 6

2 36 2 2 2

1

2 2 69 4 1 6

1 8 1 2Den .

27. 4

3. 9

8. 3 2. 5 1 4 6 0 8
331. 3
3. 9 611. 1 32. 8

1. 5

3. 3 3. 0

1. 3 8 0

1. 2 Surve y 3 2

Decembe r 1 6 Ne wC C Uni u N=1 2 C i . Den .

3 6 50 8

6 8. 2 11 2 170 1 1 1. 8 9 12. 7
55 4 767. 2

1 1 16. 2 22 3 334. 0 16 3 224. 7

I S 24 4
3 3. 2 1.13 3 1 1. 6 1 3 16. 3

1 4 17.199 9

Uni u 64 7 N = Ct .

6

1 8 2 6 1 7
35 1 4 1 2 17 6 10 8

1

3
3 70 7 5

3 1 2 Den .

10. 7

1. 2 14. 2 4 3 0 1 6 1 0 9
527. 2 6. 5 18. 2 250. 7 181. 7

1 6

5. 2
4. 4
8 4 Surve y 3 3

Decembe r 2 1 • 22.199 9 Ne w C C Unit s Uni u 6* 7 N = C t

3

3 1 1 1 3 14 6 1 3
23 8

1 20 1 3 6

8

1 66 5 2 7 1

1 0 1 2 N =

Den . Ct .

4. 4 5

4. 3 8 1. 5 1. 2 3 19. 6 3 3 226, 4 4 7 19. 1 2 3
347. 2 19 1

3 1. 7 4 283. 3 20 0 3 6 9 6 9

1

12. 7 3

1. 2 3 59 7 3. 2 1 1 1 0 2 1. 6

3 1 2 Den .

6. 5

11. 8 6. 8 47. 6 69. 4 35. 0

274. 5 3. 7 5. 7 257. 2 98. 8

1. 2

4. 8
3. 5 1. 2 2. 9 Surve y 3 4

Decembe r 2 9 - 30.199 9 Ne w C C Uni u Unit s Ml 7 N = Ct .

1 6 1 I I 1 6 I I
42 4
5 27 8 1 7
I

2

2 8

79 2 1 1

2 1 2 N = Den . Ct .

1

1. 6 1 10. 7 3 1. 6 18. 6 3 1. 7 9. 2 1 18 6 9

714. 5 23 3
9. 3 4 460 6 6 9 27. 4 9

1 6 1

1

3 1 1

40. 3 2 5

3 36 4 2. 0 2. 0

0 1 2Den .

1. 7

1 9 5. 3
5 4 1. 6 1 5 2
395. 7
6 6 119. 6 14. 6

1. 7

1. 9

1. 3

43. 2
5. 2 Surve y 3 5

Januar y 6 - 7.200 0 Ne w C C Uni u Uni u 6* 7 N C l .
3 8

1

7 5 1 8

21 6
1 31 7 2 1

1 1

59 9 5

1 6 = 1 2 N=I 2 Den . Cl . Den .
5. 7 15. 7 1 2 22. 1

1. 2

14 6 1 0 16. 7 9. 8 4 6. 9 3 6 5 I I 1 7 1
426. 2 14 6 254, 5

3 6 1 1. 8 6 H. O 58 9 6 13 4 23 0 1 39. 2 2 0 34 4

1 8 1 8

34 6 9. 5 1 1. 7

2. 0 1

E9-053. 9 4-1 0 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.7 7 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m) of all Larva l Fis h Tax aandMegalop s o f Cancer spp . an dEuropea n Gree n Crab s Collecte di

n fron t o f the Mos s Landin g Powe

r Plan t Ne w Combined-cycl e Unit s an

dUnit s 6 an

d7 Intakes : Marc

h 2,199 9 through Februar

y 24 , 2000 . Taxo i Ammodytes hexapterus Artedius lateralis Anedius spp . Atherinidae tnid . Atherinops affinis Atherinopsis californiensis Auiorhynchus flavidus Bathylagus ochotensis Balhymastcrida c tni d Blennioide i Brosmophycis marginata Cebidichthys violaceus Chaenopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinecoaus totalis Clupea pallasii Clupeidae unid . Clupe i formes Coryphopterus nicholsi Cottida e tni d Cottus taper Engraulis mordax Genyonemus lineatus Gibbtmsia spp . Gillichthys mirabilis Gobiesocida e unid . Gobiesox spp . Gobiida e - typ e I Gobiida e mid . Hexagranvnida c unid . Hypsoblennius spp . larva l fis h - damage d larva ) fis h fragmen

t larval/posl-larva

l fish . unid . Lepidogobius lepidus Leptocoaus armatus Leuroglossus stilbius Liparis fucensis Liparis tre, OUgocottus spp . Ophidiidaeini d Ophiodon elongatus Osmeridae uni d Oxyiebius picats Parophrys vetulus Jmdidida c tni d Pleuronectes tnlineatus Pleuronectes isaiepis Pleuronectida e uni d Pleuroneaiforme s tni d Psettichthys melanostictus Ruscarius crtaseri Sardinops sagax Scorpaenichthys marmoratus Sebastes spp. Sebasses spp . V Sebastes spp . VJ ) Sebastes spp . V_D e Sebastes spp . V D Sebastes spp . V P Sebassoloous spp . Stenobrochiiu leucapsarus Stichaetda e uni d Syngnathida e uni d Syngnashus Sffi . Tarletonbeania crenularis Typhlogobius edifornienxis Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megakfM ) Cancermagister(mcgakfM ) Cancerproductus (megalops ) Cancerspp . (megalops ) Carcinus maenas (megalops ) Commo n Nam e Pacifi c san d lano e smocthhea d sculpi n satlpin s silverside s topsmelt jacksmel l tubesnou t popey e biacksmel t rcnquil s blennie s redbrotul a monkeyfac e ee l tube blennie s Pacifi c sandda

b speckle d sandda

b wool y sculpi n Pacifi c herring herring s herring s an d anchovie s Nackey e gob y sculpin s prickly sculpi n norther n andiov y whit e croaker clini d kelpfishe s longjaw mudsucker clingfishe s clingfishe s gobie s gobie s greenling s Nenn.e s unidentifie d larva

l fishe s unidentifie d larva

l fishe s unidentifie d larva

l fishe s ba y gob y Pacifi c stagho m sculpi n Californi a smoothtcngu e slipski n snailfts h snailfishe s sculpin s cusk-eel s lingco d smel u painted greenlin g Englis h sol e gunner s rocksole butte r sol e flounders flatfishe s sand sol e rouchdieck sculpi n Pacifi c sardine cabezo n rockfishes rockfishe s rockfishe s rockfishes rockfishes rockfishes thornyhead s norths n lampftsh pricktebacks pipefishe s pipefishe s Nu e lanltrofis h Nindgob y HS H TOTALS : trow n rock cra

b yello w roc

k cra b slende r rock cra

b hair y roc k cra b dungenes s cra b red rock cra

b unidentifie d cance r crab s Europea n green cra

b CRA B TOTALS : Surve y 3 6 Januar y 1 3 14.200 0 Ne w C C Uni u Uni u 64 7 N=I 2 N = Cl . Den . Ct . 1 2. 1

1 2 2 34. 7 2 1 1 7 1 3 5. 2 6 28 4 492. 2 20 0

2 28 2 509. 5 6 2 2 9 48 6 2 0

3 3 88 8 1 0

1 2. 1

67 6 30 4 1 2. 1 1 1.

7 2 1 1.

7 3 2 1 2 Den .

1. 8 3. 2 1. 7 9. 5 319, 0 3, 0 98. 7 34. 0

17. 0

3. 3 Survey 3 7

Januar y 20 - NewCCUni u N = C l 3

4

1 2

3 14 6 1 22 1 5 6

2

1 2 2 1

44 5 2 1 2

5 1 2 De n 3. 7

7. 9

2, 0 3. 2

6 0 249. 2 1. 7 367. 9 104. 3

3 3

2. 0 4. 0 3. 4 2 0

3 9 2. 0 4. 0 21.200 0 Uni u 6* 7 N = ci . 1

4 1

3 1 1 2 I I 5 10 8

12 1 6 5

3

3 1 1 2

33 3 1

1 1 2 Den . 1.9

6. 8 1. 7

3. 2 2. 1 2 0 3. 5 22. 1 9 1 19 5 6

209. 4 118. 9

3. 6

5. 3 2 1 1.5 3. 2

2. 1 Survey 3 8

Januar y 2 7 Ne w C C Uni u N = a . 3

1 8

14 1 6 2 1 1 3 2 1 2 . 41 4 6 30 5 2 8

9

3

2

83 0 1

1 1 2 Den . 4. 8

31. 6

23. 9 2. 2 12 0 3. 8 20. 8 9. 4 33. 7 4. 0 792. 8
II I 577. 1 52. 7

16. 7

4. 9

3. 1

1 8 28.200 0 Uni u 6* 7 N = Cl . 2

2 2

3

3 3 3 1 8 4 1 3 2 25 4 1 2 19 8 3 3

3

1

58 7 1 1

2 1 2 Den . 3. 1

32. 2

4. 7

61 0 4. 7 1. 9 13. 0 6. 4 20. 2 3 2 446 4 2. 2 3. 5 335. 5 56 9

7. 3

1. 6

1. 8 1.7 Surve y

Febniary3 - NewCCUni u N=I 2 Ct . 5 9

6

2 6 6 1 3 2 2 3 3 2 2 5 35 1 2 45 9 3 7 1 1 2 3

3 5 2

3

1.06 1 2 1 3 Den . 99. 6

9. 8

3 5 109 5 1. 4 5 0 3 4 3. 4 4. 6 5 1 37. 4 8. 8 601. 2 3 8 797. 0 63. 1 1.7 1. 7 38. 3

5. 6 8 5 3. 5

5. 0

3. 2 1.7 3 9 4.200 0 Uni U 6* 7 N c Cl . 4 2 1 1 0 1

157 2 1 3 4 5 2 22 0 3 4 17 7 6 0

2 8 1 2

3

73 7 3 3 6 1 2 De n 77. 8 1. 9 18 1 1 4

285. 0 3 4 29 5 7. 0 8 9 3 5 393 8 5. 5 7. 2 312. 8 106. 3

50. 7 1. 7 3. 4

5. 2

6 0 3. 6

E9-053. 9 4-1 1 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.7 8 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-1 . (continued) . Mea n Concentration s (#/l,00 0 m 3 ) o f al l Larva l Fis h Tax aan

dMegalop s of Cancer spp . andEuropea

n Green Crab s Collecte din fron t ofth e Mos s Landin g Power Plant Ne w Combined-cycl e Unit s an

dUnit s 6 an

d7 Intakes : March 2 , 1999 through Februar y 24 , 2000 . Taxa i Ammodytes hexapterus Anedius lateralis Anedius spp . Atherinida e mid . Atherinops affinis Atherinopsis californiensis Auiorhynchus flavidus Balhylagus ochotensis Balhymasterida e tni d Blennioide i Brosmophycis marginata CebisSchthys violaceus Chaenopsida e tnid . Citharichthys sordidus Citharichthys stigmaeus Clinocotlus analis Clupea pallasii Clupeida e tnid . Clupeiforme s Coryphopterus nicholsi Cottida e mi d Cottus asper Engraulis mordax Genyonemus lineatus Gibbtmsia spp . Gillkhlhys mirabilis Gobiesocida e unid . Gobiesox spp. Gobiida e - typ e 1 Gobiida e mid . Hexagrammidae mid . Hypsoblennius spp . larva l fis h - damage d larva l fis h fragmen

t larval/post-larval fish . unid . Lepidogobius lepidus Leptocottus armatus Leuroglossus stilbius Liparis fucensis Liparis spp . OUgocottus spp . Ophidiida c mi d Ophiodon elongatus Osmerida e mi d Oxyiebius pkttts Parophrys vetulus Pholidida e mi d Pleuronectes bilineattts Pleuronectes isaiepis Pleuronectida e mi d Pleuroneclifcnrc s mi d Psettichthys melanostictus Ruscariiu crtaseri Sardinops sagax Scorpaenichthys mamtoratus Sebastes spp. Sebastes spp . V Sebastes spp . VJ > Srfxuje s spp . V_D e Sebastes spp . V D Sebastes sp p V P Sebastatobus spp . Stenobrtschius leucopsarus Stieftacida c uni d Syngnathida e tni d Syngnathtu spp . Tartetonbeania crenutaris Typhlotobius ealihmiensis Canceranseimtsritts (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancermagister(megalops ) Cancerproductus (megalops ) Cancerspp . (megakps ) Carcinus maenas (megalops ) Common Nam e Pacifi c san d lano e smtxxhhca d sculpi n sculpin s silverside s topsmel t jacksmel l lubesnou l popey e Nacksmel l ronquil s Hennie s redbrotul a ' monkeyfac e ee l tub e blennie s Pacifi c sandda

b speckle d sandda

b wool y sculpi n Pacifi c herrin

g herring s herring s an

d anchovie s blackey e gob y sculpin s prickly sculpi n norther n anchovy white croaker clini d kelpfishe s longja w mudsucker clingfishe s clingfishe s gobie s gobie s greenling s Mennies unidentifie d larva

l fishe s unidentifie d larva

l fishe s unidentifie d larva

l fishe s ba y gob y Pacifi c staghor

n sculpi n Califomi a smoothtongu e slipski n snailfts h snailfishe s sculpin s cusk-eel s lingco d stnel u painte d greenlin g Englis h sat e gunnel s rocksol e butle r sol e flounders flatfishe s san d sol e rouchchcck sculpi n Pacifi c sardin e cabezo n rockfishes rockfishe s rockfishe s rockfishe s rockfishes rockfishe s thornyhead s ncrtho n lampTis

h pricklebnck s pipefishe s pipefishe s blu e lantonfis h blin d gob y FIS H TOTALS : brow n rock cra b yello w rock cra b slende r rock cra

b hairy roc k cra b dungenes s tra b re d rock cra

b unidentifie d cance r crab s Europea n gree n cra b CRA B TOTALS : Surve y 4 0 Februar y 10 - Ne w C C Uni u N c Q . 3 7 1 4

1 2 1 0 I 4 3 1 2 7 9 3 72 8 1 7 2 24 0 2 5 1

1 3 6 1
1

1

1.16 7 2 1

3 1 2 Den . 57. 2 1 6 6. 3

1 6 3. 2 14. 8 1 6 5. 9 8. 3 1 4 3. 0 13 2 0 4. 7 110 2 4 1 4 9. 6 2. 7 360. 8 38 0 1 4

1. 7 4. 6 9 6 2 1 1. 4

1. 4

3. 2 1. 4 1.2O0

O Uni u 6* 7 N = a . 2 8

3

1 1 1 10 1 6 1 10 4 2 2 31 3 3 1 7 6 7 1 4 1

2 2

1 1 38 1 1 1 2 12 Den . 45. 5

4. 6

1 6 1. 7 1 7 1 6 1 1 4 9 3 1 9 139. 6 3. 0 3. 0 491. 1 5 0 27. 7 109. 9 21. 7 1.5

3. 2 2. 8

1.5 1 4

1 4 1. 4 Survey 4 1

Fetruary 1 7 • Ne w C C Uni u i N = Cl .

2 6

1 1 I I 4 1 8 5 5 4 4 85 0 8 1 3 16 0 3 5

1 14 1 2 2

1 8 1

1.22 0
1

1 1 2 Den .

42. 9

1. 3 2. 0 18 5 6 3 30 9 7. 7 87, 0 7. 0 1338 4 14. 3 21. 6

' 248. 3 59 5

1.5 23. 3 2 1 3. 0 3. 1

1 5 12. 6 1.3

1.3 8.200 0 Uni u 6* 7 N = C l 2

1 1 2 4 3 2 0 1 7 4 4 5 1 3 31 4 1 0 3 12 1 4 7

7

4

1

9 1

64 7 2 1

3 12 Den . 3. 0

1. 8 1 7 39. 1 5, 0 32. 2 28, 5 6 6 73. 1 21. 7 537. 7 17. 1 4. 9 205. 1 78. 9

11 9
6, 7

1.6

14. 8 1. 6

3. 5 1. 7 Survey 4 2

Februar y 24 - NewCCUni u N c ci . 5

1

3 2 1 0 1 I 1 0 2 1 8 3 4 5 I I 72 7 1 15 2 9 1 10 7 2 6 1 1 2 1 1 1 2 2 4 4

4

3 4 14 2 1 8 1,25 3

0 12 Den

7, 7

1. 7

4. 1 3 0 16 9 1 6 1.3 14 9 2. 5 27 8 4. 6 69 4 16 5 1088. 4 1 6 21 8 44. 9 1 5 154. 0 41 0 1 6 19. 3 1.3 1 6 1. 5 3 0 35. 5 5. 5

5. 7

52 6 221. 3 1, 8 12. 8 25.200 0 Uni u 6* 7 N = C l 2

1 3 1 1 5 1 0 1 9 5 3 5 2 1 4 49 3 4 I I 16 1 2 7

1 7 1 7 9 3

4 1 1 2 1 7 4 1 3 93 4 1 2 3 1 2 Den . 3. 0

1 4 4. 6 1. 4 1. 2 7. 4 14. 4 28. 1 7. 4 4. 6 74. 7 20. 3 707. 9 5. 9 16. 2 227. 8 39 9

25. 0 1. 2 9. 7 12. 2 4 6

3. 5 1. 6 1. 2 30. 0 107. 4 1. 4 4. 3

1. 4 3. 2

E9-053. 9 4-1 2 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.7 9 4. 0 Entrainmen t an d Source Wate r Results 

### 4.1.1 Sampling

and Laboratory

Processing

Sufficiency Th e accumulatio n o

f specie s durin g entrainmen t samplin g through Jul y a

t MLPP followed expecte dpattern s wit

h rapi daccumulatio n durin g earl y samplin g efforts tha t decrease dwit

h continue dsamplin g (Figure s 4- 2 and4-3) . Difference s i n th e tota l numbe r of tax acollecte dan

d the rate o f tax aaccumulatio n wer

e note dbetwee

n samplin g stations . A tota l o f 64 tax awas collecte da

t th e ne w combined-cycl e unit s intak e whil e 5 7 tax awer

e collecte dfro

mth e Unit s 6 an d7 intak e ove r th e entir e yea r o f surveys . The tax acollecte da t the ne w combined-cycl e unit s intak e tha t wer e not collecte da

t th e Unit s 6 an

d7 intak e fro mMarch 2 through Februar y 24 , 200 0 ar e show n i n Tabl e 4-2 . The tax atha

t wer e uniqu e to the Unit s 6 an

d7 intak e ar e als o show n i n Tabl e 4-2 . Tabl e 4-2 . Species foun

dt o b e Uniqu e t o eithe r th e Ne w Combined-cycl

e Unit s o r th e Unit s 6 an d7 Intakes . Dat

afro mSurveys 1 throug

h 42 . Taxa unique to the New combined-cycle Units intake Taxo n Scorpaenichthys marmoratus Ophiodon elongatus Leuroglossus stilbius Bathymasterida e unid . Ophidiida e unid . Sebastes spp . V P Sebastes spp . V_ D Pleuronectes isolepis Gobiida e - typ e I Gobiesocida e unid . Liparis spp . Brosmophycis marginata Hexagrammida e unid . Commo n Nam e cabezo n lingco d Californi asmoothtongu e ronqui l cuskee l rockfis h rockfis h butte r sol e unidentifie dgob y unidentifie dclingfis h unidentifie dsnailfis h re dbrotul a greenlin g Taxa unique to the Units 6 and 7 intake Taxo n Auiorhynchus

flavidus Pleuronectes bilineatus Liparis fucensis Typhlogobius californiensis Bathylagus ochotensis Commo n Nam e tubesnou t roc k sol e slipski n snailfis h blin dgob y popey e blacksmel t



### Mea n concentration s (#/m3 

### ) fo

r fishe s collecte dfro

mth e station s i

n fron t o f th e ne w combined cycl e unit s an

dth e Unit s 6 and7 intake s durin g Survey s 1 through 4 2 wer e base don tw o replicat e sample s collecte da

t eac h locatio n durin g acycle . Thes e datainclude dall six cycle s fo r Survey s 1 through 42 . A tota l o f 25 1 paire dsample s was analyze dt o determin e i

f difference s i

n specie s abundance s between th e tw o samplin g area s coul db e detected . I f n o difference s wer

e detected , laborator

y processin g coul db e reduce dto asingl e representativ e location . Although 7 0 larva l fish tax agroup s wer

e collecte dfro

mthes e samples , only 5 1 tax awer e collecte da

t bot h locations . Th e mea n concentration s o

f th e 5 1 tax acollecte da

t bot h location s wer

e analyze dstatistically usin g apaire dt-tes t

(Tabl e 4-3) . Th e concentration s fo r bot h location s wer

e transforme dusin g E9-053. 9 4-1 3 MLP P 316(b ) Resource Assessmen t 4-28-200 03 .8 0 4. 0 Entrainmen t an d Source Wate r Results logio(x-f-.Ol ) t o loo k

a t relativ e difference s betwee n th e tw o intake s an dt o accoun t fo r som e o f th e difference s i n abundanc e betwee n samplin g events . O f th e 5 1 tax acollecte di n both areas , significan t

difference s (a=0.05 ) betwee n th e tw o intake s wer e detecte di n seve n taxa : blackey e gob y Coryphopterus nicholsi, Pacifi c herrin g Clupea pallasi, whit e croake r Genyonemus lineatus, longja w mudsucke r Gillichthys mirabilis, prickl y sculpi n Cottus asper, ba y gob y Lepidogobius lepidus, an dEnglis h sol e Parophrys vetulus. Pacifi c herring , longja w mudsucke r an dprickl y sculpi n wer e collecte di n significantl y highe r concentration s at

th e Unit s 6 an d7 intak e whil e th e othe r

four tax awer e collecte di n significantl y highe r concentration s a

t th e ne w combined-cycl e unit s intake . Tabl e 4-3 . Result s o

f T-test s Comparing Larva

l Fis h Concentration s a

t the Ne w Combined-cycl e Unit s an dthe Unit s 6 an

d7 Intake s Collecte ddurin g Survey s 1 through 42 . Taxo n Pholididae unid . Gibbonsia spp . Atherinidae unid . Oxyiebius pictus Coryphopterus nicholsi Cebidichthys violaceus Engraulis mordax Artedius lateralis Pleuronectidae unid . Artedius spp . Stichaeida e unid . Syngnathus spp . Sebastes spp . larval/post-larva

l fish, unid . Citharichthys stigmaeus Citharichthys sordidus Clinocottus analis Chaenopsida e unid . Sebastes spp . V Sebastes spp . V__.D

e Ruscarius creaseri larva l fish - damaged Hypsoblennius spp . Sebaste s spp . V D Sebastolobus spp . Clupeiforme s Clupea pallasii Lo g (x+.Ol ) Difference s Betwee n Ne w C C Unit s an d Unit s 6 an d 7 Mea n Differenc e -0.00121 1 -0.00432 2 0.00763 6 0.00611 5 0.04857 1 0.01754 0 -0.01779 7 -0.00023 2 0.00034 4 -0.01092 9 0.00332 7 0.00136 2 -0.00008 4 0.00544 7 0.00735 0 0.00039 9 0.00366 0 -0.00335 6 0.00323 8 0.00704 3 -0.00158 6 -0.00448 4 0.01393 3 0.00132 3 0.00373 8 0.00175 0 -0.10082 1 No .

25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 Std . Erro r

0.03233 4 0.05545 3 0.14004 7 0.05581 3 0.34790 1 0.17043 3 0.17206 6 0.03417 2 0.10470 2 0.10835 7 0.04385 3 0.04013 5 0.02415 2 0.08699 6 0.07127 0 0.05496 8 0.05373 6 0.07640 5 0.05474 6 0.10888 8 0.04234 4 0.14692 8 0.23636 9 0.03016 7 0.06715 7 0.07765 7 0.30551 8 T-Valu e

-0.59 3 -1.23 5 0.86 4 1.73 6 2.21 2 1.63 0 -1.63 9 -0.10 8 0.05 2 -1.59 8 1.20 2 0.53 7 -0.05 5 0.99 2 1.63 4 0.11 5 1.07 9 -0.69 6 0.93 7 1.025 -0.59 3 -0.48 3 0.93 4 0.69 5 0.88 2 0.35 7 -5.22 8 Probabilit y

of T 0.553 5 0.218 1 0.388 5 0.083 8 0.027 9 0.104 3 0.102 5 0.914 4 0.958 5 0.111 3 0.230 6 0.591 4 0.956 0 0.322 2 0.103 5 0.908 4 0.281 6 0.487 1 0.349 7 0.306 5 0.553 6 0.629 2 0.351 3 0.487 9 0.378 8 0.721 4 0.000 0 Powe r o f

Tes t 0.000 3 0.010 3 0.001 0 0.197 9 0.841 9 0.115 3 0.120 5 0.000 1 0.000 1 0.096 4 0.008 3 0.000 2 0.000 1 0.002 2 0.117 5 0.000 1 0.003 8 0.000 4 0.001 6 0.002 7 0.000 3 0.000 2 0.001 5 0.000 4 0.001 1 0.000 1 1.000 0 E9-053. 9 4-1 4 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.8 1 4. 0 Entrainmen t an d Source Wate r Results Tabl e 4- 3 (continued) . Result s o f T-test s Comparing Larva

l Fis h Concentration s a

t th e Ne w Combined-cycl e Unit s an

d the Unit s 6 an

d 7 Intake s Collecte ddurin g Survey s 1 throug h 42 . Taxo n Gillichthys mirabilis Ammodytes hexapterus Cottus asper Lepidopsetta bilineata Cottidae unid . Syngnathida e unid . Atherinopsis californiensis Genyonemus lineatus OUgocottus spp . Lepidogobius lepidus Gobiida e unid . Leptocottus armatus Parophrys vetulus Psettichthys melanostictus Osmerida e unid . Tarletonbeania crenularis Stenobrachius leucopsarus Clupeida e unid . Gobiesox spp . Pleuronectiforme s unid . Sardinops sagax larva l fish fragmen t Blennioide i Atherinops affinis Lo g (x+.Ol ) Difference s Betwee n Ne w C C Unit s an d Unit s 6 an d 7 Mea n Differenc e -0.04618 4 0.00609 1 -0.03328 7 0.00181 4 -0.02207 8 0.00005 3 0.02453 5 0.05821 4 -0.00743 9 0.11877 6 0.00075 4 0.00360 5 0.00811 9 0.00288 9 0.00079 7 -0.00359 5 0.01533 3 -0.00316 7 0.00015 6 0.00526 6 0.00071 5 0.01035 6 -0.00079 1 -0.00525 7 No .

25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 25 1 Std . Erro r

0.29277 1 0.11585 1 0.20523 0 0.04754 6 0.19522 2 0.03168 1 0.21616 1 0.22434 4 0.08845 3 0.49928 8 0.44022 6 0.28095 7 0.05263 0 0.03879 2 0.22208 8 0.06879 6 0.14823 7 0.07110 3 0.02457 8 0.07914 6 0.01133 1 0.24552 5 0.03173 1 0.07806 9 T-Valu e

-2.49 9 0.83 3 -2.57 0 0.60 4 -1.79 2 0.02 7 1.79 8 4.11 1 -1.33 2 3.76 9 0.02 7 0.20 3 2.44 4 1.18 0 0.05 7 -0.82 8 1.63 9 -0.70 6 0.10 1 1.05 4 1.000 0.66 8 -0.39 5 -1.06 7 Probabilit y

of T 0.013 1 0.405 7 0.010 8 0.546 1 0.074 4 0.978 7 0.073 4 0.000 1 0.183 9 0.000 2 0.978 4 0.839 1 0.015 2 0.239 2 0^954 7 0.408 5 0.102 5 0.481 0 0.919 8 0.292 9 0.318 3 0.504 6 0.693 1 0.287 1 Powe r o f

Tes t 0.990 3 0.000 9 0.996 4 0.000 3 0.256 2 0.000 1 0.263 7 1.000 0 0.019 3 1.000 0 0.000 1 0.000 1 0.980 6 0.007 2 0.000 1 0.000 8 0.120 6 0.000 4 0.000 1 0.003 2 0.002 3 0.000 4 0.000 1 0.003 5 Preliminar y result s —qualit y contro l check s incomplet e


# 1 I E9-053. 9 4-1 5 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.8 2 4. 0 Entrainmen t an d Source Wate r Results 

### Unit s 1- 5 7 0 C O X C O I — o 4f e C D > 6 0 5 0 4 0 3 0 

### c u O 2 0 1 0
r 1 0 1 I ' ' ' ' I ' ' ' ' I ' ' ' ' I ' ' ' ' I ' ' ' ' I ' 1 5 2 0 2 5 3 0 3 5 4 0 

### 4 5 

### Surve y Numbe r Figur e 4-2 . Mea

n (dotte dline) , maximu

man dminimu m(dasheduppe

r an dlowe r lines ) cumulativ e number s o f

specie s fro

m1,00 0 iteration s o

f datacollecte dove

r 4 2 survey s a

t th e ne w combined-cycl e unit s intake . 

### Unit s 6- 7

-p-i—IIIIIIII—111111111111111—111 1 -i—11111—| - 0 5 1 0 1 5 2 0 2 5 3 0 35 4 0 4 5



### Surve y Numbe r Figur e 4-3 . Mea

n (dotte dline) , maximu

man dminimu m(dasheduppe

r an dlowe r lines ) cumulativ e number s o f specie s fro

m1,00 0 iteration s o

f datacollecte dove

r 4 2 survey s a

t th e Unit s 6 an

d7 intake . E9-053. 9 4-1 6 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.8 3 4. 0 Entrainmen t an d Source Wate r Result s Th e powe r

o f th e dat at o detec t

adifferenc e betwee n intake s i f on e actuall y existe dwas calculate dfo r

th e tax agroup s with dat afro mboth intakes . I n th e tax awher e n o difference s wer e detected , th e lo w estimate s o f powe r (al l < 0.80 ) indicate dtha t i t woul db e difficul t

t o conclud e from" th e dat afo r

thos e tax atha t

n o significan t

differenc e betwee n intake s existed . Althoug h statistica l powe r

usuall y increase s wit

h sampl e siz e i t

i s als o affecte db y variance . Th e varianc e increase dwit

h sampl e siz e reducin g th e powe r o f th e tests . Th e numbe r

o f significan t difference s betwee n unit s for th e 5 1 tax ai s greate r

than on e woul dexpec t

base do n a9 5 percen t probabilit y level . Thes e dat aindicat e tha t ther e ar e both qualitativ e an dquantitativ e difference s betwee n th e tw o intakes . 

### 4.1.2 Day-Night

Comparison ETM an dproportiona l entrainmen t (PE) value s ar e base do n daytim e estimate s o f entrainmen t an dsourc e wate r

larval concentrations . Becaus e th e unmarke dElkhor n Soug h channe l canno t b e safel y navigate dothe r

than durin g daytim e hours , calculatio n o f ETM values (an dP

M ) mus t rel y on daytim e sourc e an dentrainmen t samplin g results . Intak e effect s ar e als o estimate dwhe n possibl e usin g fecundity hindcastin g (FH) an dadul t equivalen t

los s (AEL) model s base don daytim e an dnighttim e entrainmen t samples . Twelv e month s o f weekl y entrainmen t

sample s (Marc h 199 9 t o Marc h 2000 ) hav e bee n collecte dfor thes e analyse s in th e routin e 24-hou r entrainmen t

samplin g describe di n Sectio n 3 . Generall y highe r

concentration s o f

larva e wer e collecte din nighttim e entrainmen t samples . Thes e diurna l change s i n larva l concentration s foun di n ou r 24-hou r sample s result s ar e importan t measurement s i n accuratel y estimatin g o f tota l entrainment . Th e tota l entrainmen t value s ar e use di n bot

h th e fecundity hindcas t

(FH) an dadul t

equivalen t

los s (AEL) model s t o estimat e entrainmen t

losses . Thes e daytim e an dnighttim e change s i n th e concentratio n o f entraine dlarva e ar e unimportan t usin g a n ETM mode l o f entrainmen t

loss , i f th e rati o o f entrainmen t

t o sourc e wate r

concentration s remai n th e sam e throughou t th e day . Sinc e sourc e wate r

station s i n th e Elkhor n Sloug h coul donl y b e safel y sample ddurin g dayligh t hours , member s o f

th e TW G requeste dtha t

w e tes t for diurna l change s i n proportiona l entrainmen t

usin g tw o sourc e wate r

station s tha t

coul db e safel y sample dat night . A separat e sourc e wate r

survey wa s conducte do n Januar y 2 7 an d28 , 200 0 an danothe r conducte do n Februar y 3 an d4 , 200 0 at th e Harbo r

Bridg e (HB ) an dHarbo r Mouth (HM ) station s show n in Figur e 3-1 . Sample s wer e collecte dt o coincid e wit h eac h o f th e si x cycle s i n th e 24-hou r entrainmen t

surveys . Th e tim e o f

da y fo r eac h collectio n cycl e 1 throug h 6 ar e liste di n Tabl e 4-4 . Prio r

t o completin g thes e survey s an danalyses , w e first conducte dates t

usin g 24-hou r dat afro mneighborin g entrainmen t station s (ne w combined-cycl e unit s an dUnit s 6 an d7 intakes) . E9-053. 9 4-1 7 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.8 4 4. 0 Entrainmen t an d Source Wate r Results 

### Result s o f 24-hou r entrainmen

t samplin g ( 6 samplin g cycles , fou r hour s apart) clearl y indicat e significan t increase s in evenin g an

dnighttime larva

l abundance , peakin g in th e middl e o f th e night . Hypothetically , increase s i n entrainmen

t larva l concentration s shoul db e accompanie dby similar , i f no t identica l increase s i

n sourc e wate

r concentrations . Sinc e information o n nighttim e source-wate

r concentration s i s not

available , we cannot

mak e adirec t tes t o f thi s hypothesis . Instead , w e compare dthe rati o o f 24-hou r larva l concentration s collecte da t th e neighborin g Unit s 6 an d7 entrainmen

t samplin g station . Concentration s o

f unidentifie dGobiidae , th e mos t consistently abundan

t larva l taxa , wer e usedt o provide th e larges t

numbe r o f paire dstatio n samples . Result s fro m2 9 weekly 24-h

r entrainmen

t survey s (1-2 8 an

d34 ) collecte dfro

mth e station s o

f the ne w combined-cycl e an

dUnit s 6 an

d7 intake s wer

e use di n the comparison . Result s fro mSurve y 13 , cycl e 4 ; Surve

y 14 , cycl e 5 an

d Surve y 16 , cycl e 5 wer

e no t use di n th e analysi s du e t

o the extreme , outlyin g natur e o f the thre e values . The value s ma

y represen t eithe r arar e se t o f ye t unexplaine dcircumstance s or experimenta

l error . W e wil l continu e to investigat

e thes e separate dresults . Concentration s fro m th e tw o area s wer

e compare db

y simpl e rati o o

f replicat e sample s a s closely paire di n tim e a s possible . Th e tes t result s indicat

e the rati o o

f unidentifie dGobiida

e larva l concentration s betwee

n th e tw o station s chang e roughly 7 5 percen t betwee n da y an dnight . Th e decrease dnighttime similarit y o f the tw o station s ma

y reflect th e presenc e o

f ahydrauli c transitio n zon e betwee n the tw o stations , wher e mor e outgoin g tida

l flows fro mElkhor n Sloug h bearin g concentration s o

f larva e reach th e combined-cycl e are atha

n th e are ao

f th e Unit s 6 and7 intake . Th e existenc e o f such ahydrauli c patter n wouldb e amplifiedby the lat e nighttime hour s (cycle s 4 an d5 ) b y highe

r concentration s o f larva e fro mthe slough . Although w e continu e belo w to compar e thes e finding s to result s fro mnighttime sample s collecte da t the Harbor

Bridg e an dHarbor Mout h stations , th e spatia

l effects see n in th e firs t

tes t result s see

mt o preclude th e possibilit

y o f convertin g daytim

e sourc e wate r concentration s to nighttim e concentrations .

E9-053. 9 4-1 8 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.8 5 

# 1 I 4. 0 Entrainmen t an d Sourc e Wate rResult s 

# 1 1 I 1 1 1 1 1 1 I 1 I 1 Tabl e 4-4 . Sample Collectio n Time s (PST ) b y Cycle , Dat

e an dSourc e Wate

r Stations , Harbo

r Mout h (HM ) an dHarbor Bridg e (HB) . Cycl e 1 2 3 4 5 6 Harbo

r Mout h 01/27/200 0 02/03/200 0 10:5 5 11:1 2 14:3 9 14:4 3 18:4 2 18:4 9 22:3 8 22:4 8 2:5 1 2:4 7 6:4 3 6:45 1 Harbo r Bridg e 01/27/200 0 02/03/200 0 10:4 5 10:5 8 14:2 8 14:2 9 18:3 2 18:3 7 22:2 7 22:3 4 2:3 4 2:3 3 6:3 0 6:3 3 Th e result s o f

adaytim e an dnighttim e surve y o f tw o sourc e wate r

station s reveale dn o clea r patter n o f eithe r highe r o r lowe r entrainmen t

proportion s wit

h respec t t o tim e o f

day . Th e concentration s ofth e thre e larval taxa , unidentifie dgobies , bay goby , an dPacifi c staghor n sculpin , tha t

wer e consistentl y presen t in both entrainmen t

an dsourc e wate r

sample s ar e compare di n Table s 4- 5 an d4-6 . Ratio s show n in th e tabl e wer e calculate db y dividin g th e species ' larva l concentration s collecte da t th e ne w C C unit s intak e entrainmen t statio n b y thei r concentration s a

t th e Harbo r

Mout h (HM ) an dHarbo r

Bridg e (HB ) stations . Th e result s ar e tabulate dfo r

th e thre e tax ab y survey dat e an dth e si x samplin g cycles . Th e averag e o f al l o f th e species ' ratio s b y tim e o f da y (samplin g cycle ) range s fro m1. 5 t o 12. 8 with minimu mvalue s o f 0. 1 t o maximu mvalues o f 57 . Th e result s wer e highl y variabl e with n o clea r patter n o f nighttim e an ddaytim e difference s i n proportio n o f entrainmen t

an dsourc e wate r

larva l concentration s fro mth e harbo r stations . Th e effec t

o f tida l current s o n distributio n o f larva l fishe s fro mth e Elkhor n Sloug h an dMontere y Ba y woul db e expecte dt o represen t alarg e sourc e o f variatio n amon g sourc e wate r station s an dth e rati o o f

entrainmen t

an dsourc e wate r concentrations . Tabl e 4-5 . Rati o of

Daytim e an dNighttim

e Concentration s of

Larva l Unidentifie dGoby Taxa , Ba y Goby , an

dPacifi c Staghor

n Sculpin Collecte da

t the Harbo r Mout h (HM ) Statio n to Ne

w C C Unit s Intak

e Statio n Entrainmen

t Concentrations . H M Cycl e i 2 3 4 5 6 Unidentifie d Gobie s 01/27/200 0 2.1 4 2.2 5 0.3 0 1.0 7 7.9 0 0.4 5 02/03/200 0

0.2 3 0.3 4 10.9 5 * 0.8 4 14.5 7 Ba

y Gob y 01/27/200 0 4.4 7 19.9 9 1.0 7 1.28 4.9 3 0.3 9 02/03/200 0

0.7 1 1.0 3 54.2 5 57.1 0 2.4 7 21.0 7 Pacifi c Staghor n Sculpi n 01/27/200 0 02/03/200 0 * * 0.4 1 0.2 5 2.4 0 0.5 6 2.7 1 1.6 0 0.4 7 1.3 0 3.4 2 0.9 8 MEA N

1.8 9 4.0 5 11.5 9 12.7 5 2.9 9 6.8 1 MI

N 0.2 3 0.2 5 0.3 0 1.0 7 0.4 7 0.3 9 MA X

4.4 7 19.9 9 54.2 5 57.1 0 7.9 0 21.0 7 *N o value ca

n b e computed . E9-053. 9 4-1 9 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.8 6
4. 0 Entrainmen t an d Source Wate r Results Tabl e 4-6 . Rati o of

Daytim e an dNighttim

e Concentration s o

f Larva l Unidentifie dGob

y Taxa , Ba y Goby , an

dPacifi c Staghor

n Sculpin Collecte da

t th e Harbo r Bridg e (HB ) Statio n t o Ne w C C Unit s Intak

e Statio n Entrainment

Concentrations . H B Cycl e 1 2 3 4 5 6 Unidentifie dGobie s 01/27/200 0 02/03/200 0 2.2 0 0.1 9 3.6 0 0.3 5 0.2 4 2.9 5 1.0 4 2.1 1 1.2 7 0.7 0 0.3 7 10.0 5 Ba y Gob y 01/27/200 0 02/03/200 0 2.4 0 0.4 7 8.9 8 1.2

9 0.7 8 14.8 8 1.2 1 6.7 2 2.3 6 2.0 8 0.3 4 23.3 6 Pacifi c Staghor n Sculpi n 01/27/200 0 02/03/200 0 5.6 2 * 1.05 0.1 3 1.7 8 0.9 9 1.3 3 2.0 1 0.7 4 2.0 3 3.4 9 1.1 5 MEA N 2.1 8 2.5 7 3.6 0 2.4 0 1.5 3 6.4 6 MI N

0.1 9 0.1 3 0.2 4 1.0 4 0.7 0 0.3 4 MAX

5.6 2 8.9 8 14.8 8 6.7 2 2.3 6 23.3 6 *N o valu e ca n b e computed .

E9-053. 9 4-2 0 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.87 

# 1 1 1 1 1 1 1 1 1 I 1 4. 0 Entrainmen t an d Sourc e Wate rResult s 

## 4__ 2 Sow© © Wate rSttyd y Resyflft i Nin e monthl y surveys hav e bee n conducte dsinc e th e sourc e wate r stud y bega n i n Jun e 1999 .

• Initiall y thre e station s (Kirb y Park , Dairies , an dHarbo r Bridge ) wer e sampled . Thre e ne w station s (Figur e 3-1 ) wer e adde dt o th e sourc e wate r stud y i n Septembe r

1999 . Tw o o f

thes e station s ar e locate di n Montere y Ba y (Ocea n North an dOcea n South ) an don e statio n i s locate d • a

t th e mout h o f th e Mos s Landin g Harbo r (Harbo r Mouth) . Description s o f statio n location s ar e provide di n Tabl e 3-2 . Dat afro mthes e ne w station s fro mSeptembe r 199 9 throug h Februar y 200 0 ar e presente di n thi s report . Th e sourc e wate r

wa s divide dint o thre e area s fo r th e purpos e o f

dat aassessment . T o comput e larval fis h percen t

compositio n an dt o calculat e proportiona l entrainmen t fo r "Elkhor n Slough " dat awer e analyze dfro mth e Kirb y Park , Dairies , an dHarbo r Bridg e station s fo r

al l nin e surveys . "Mos s Landin g Harbor " dat awer e calculate dfro msample s collecte da t th e Harbo r

Bridg e an d th e ne w combined-cycl e unit s an dth e Unit s 6 an d7 intake s o n day s whe n th e sourc e wate r surveys wer e conducted . Th e "Ocean " dat awer e calculate dfro msample s collecte dfro mth e Harbo r Bridg e Statio n for

th e first thre e surveys (befor e th e ne w station s wer e added ) an dfro m th e ne w Harbo r

Mouth an dth e tw o ne w Ocea n station s fo r Survey s 4 throug h 9 . Eigh t tax ao f larva l fishe s comprise dnearl y 9 5 percen t o f th e tota l number s o f

tax acollecte din th e Elkhor n Sloug h are a(Figur e 4-4) . Th e taxa , liste di n decreasin g orde r o f abundanc e were : unidentifie dgobie s (60. 4 percent) , Pacifi c herrin g (10.9 percent) , blennie s Hypsoblennius spp . (6. 8 percent) , longja w mudsucke r Gillichthys mirabilis (5. 1 percent) , ba y gob y Lepidogobius lepidus (5. 0 percent) , Pacifi c staghor n sculpi n Leptocottus armatus (4. 1 percent) , blackey e gob y Coryphopterus nicholsi (1. 6 percent) , an dnorther n lampfis h Stenobrachius leucopsarus (1. 1 percent) . Ninety-fiv e percen t

o f th e tota l number s o f

tax acollecte di n th e Mos s Landin g Harbo r are a (Figur e 4-4 ) was represente db y man y o f th e sam e tax aliste dabove . Th e taxa , liste di n decreasin g orde r

o f abundanc e were : unidentifie dgobie s (48. 4 percent) , ba y gob y (30. 5 percent) , Hypsoblennius spp . (5. 1 percent) , blackey e gob y (2.9 percent) , norther n lampfis h (2. 7 percent) , Pacifi c staghor n sculpi n (2. 5 percent) , longja w mudsucke r (1. 6 percent) , an dwhit e croake r G. lineatus (0. 9 percent) . Specie s compositio n was mor e varie da t th e Ocea n area . Twelv e tax a(includin g unidentifie d larva l fishes ) comprise d9 6 percen t o f al l tax a(Figur e 4-4) . Th e taxa , liste di n decreasin g orde r o f abundanc e were : unidentifie dgobie s (36. 2 percent) , norther n lampfis h 5 . leucopsarus (21A percent) , unidentifie drockfishe s Sebastes spp . (6.9 percent) , whit e croake r (4. 4 percent) , ba y gob y (4. 1 percent) , Hypsoblennius spp . (3. 0 percent) , thomyhead s Sebastolobus spp . (3. 0 E9-053. 9 4-2 1 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.8 8 4. 0 Entrainmen t an d Source Wate r Result s percent) , Pacifi c staghor n sculpi n (2. 5 percent) , unidentifie dlarva l fishes (2. 4 percent) , blu e lanternfis h Tarletonbeania crenularis (1. 7 percent) , unidentifie dflounder s Pleuronectida e (1. 5 percent) , an dPacifi c san dlanc e Ammodytes hexapterus (1. 2 percent) .
Fishe * Collecte d I n Oma n Station *

Fishe s Collecte d i n Elkhor n Sloug h norther n lampfis h blackey e gob y 1.6 % staghor n sculpi n 4.1 % longja wmudsucke

r • 5 1 % uwdsWiBlW d pot-sii i 36_2 %

unidentifie d gobie s 60.4 %

Fishe s Collecte d i n Mos s Landin g Harbo r tongjawmudsucke r 1.6 %

ba y gob y 30.5 % unidentified gobies 48.4 %

Figur e 4-4 . Percen

t composition ofth e most

abundan t larva l fish tax acollecte di

n sourc e wate

r survey s a t Elkhor n Slough , Mos s Landing Harbor , an dOcea n areas : June 199 9 through Februar y 2000 .

E9-053. 9 4-2 2 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.8 9 4. 0 Entrainmen t an d Source Wate r Results Mea n sourc e wate r

concentration s (no./l,00 0 m 3 ) for al l larva l fishes fo r

al l sourc e wate r

survey s ar e presente di n Tabl e 4-7 . Sourc e wate r concentration s o f

th e eigh t mos t abundan t tax a collecte di n th e entrainmen t surveys (Sectio n 4-1 ) ar e discusse dindividuall y i n Section s 4- 3 throug h 4-10 . Mea n sourc e wate r

concentration s (no./l,00 0 m 3 ) fo r al l targete dcra b specie s collecte di n sourc e wate r surveys ar e presente din Tabl e 4-7 . Sourc e wate r concentration s o f

th e targete dcra b specie s collecte di n th e entrainmen t surveys (Sectio n 4-1 ) ar e discusse dindividuall y i n Section s 4-1 1 throug h 4-18 . Thre e specie s o f

cance r crab megalop s comprise d10 0 percen t o f th e tota l number s o f

tax a collecte di n th e Elkhor n Sloug h are a(Figur e 4-5) . Th e taxa , liste din decreasin g orde r o f abundanc e were : hairy roc k crab Cancer

jordani (5 0 percent) , re droc k cra b Cancer

productus (2 5 percent) , an dyello w roc k crab Cancer

anthonyi (2 5 percent) . Specie s compositio n wa s mor e varie da t th e Mos s Landin g Harbo r area . Fiv e specie s o f

cance r crab megalop s comprise d10 0 percen t o f th e tota l number s o f

tax acollecte din th e Mos s Landin g Harbo r are a(Figur e 4-5) . Th e taxa , liste din decreasin g orde r o f abundanc e were : hairy roc k crab (36. 4 percent) , brow n roc k crab Cancer

antennarius (34. 7 percent) , redroc k cra b (12. 2 percent) , yello w roc k

crab (8. 2 percent) , an dslende r roc k crab Cancer

gracilis (8. 2 percent) . Fiv e tax ao f

cance r crab megalop s comprise d10 0 percen t o f th e tota l number s collecte di n th e Ocea n are a(Figur e 4-5) . Th e taxa , liste di n decreasin g orde r o f abundanc e were : hair y roc k cra b (66. 9 percent) , unidentifie dCancer spp . (15.9 percent) , brow n roc k cra b (10. 6 percent) , slende r roc k cra b (5. 3 percent) , an dyello w roc k cra b (1.3 percent) .

E9-053. 9 4-2 3 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.9 Q
4. 0 Entrainmen t an d Sourc e Wate r Result s

Ocea n Station s
Cance rapp . (megalops ) 15.9 % Cance rantennariu s (megalops ) 10.6 %

Elkhor n Sloug h Station * Cance rproductu s (megalops ) 25 % Cance ranthony i (megalops ) 1.3 % Cance rgracili s (megalops )

5.3 %

Cance rjordan i (megatops) 6 6 9 %

:e rjordan i •galops ) 50 %

Cance ranthony i (megalops ) 25 % Mos s Landin g Harbo r Cance rproductu s (megalops ) 12.2 %

Cance rjordan i (megalops )

36.7 % Cance rantennariu s (megalops ) 34.7 %

Cance ranthony i (megalops )

6 2 % Cance rgracili s (megalops )

8.2 % Figur e 4-5 . Percen

t compositio n ofth e most

abundan t megalopa l cance r cra b tax acollecte di

n sourc e wate r survey s a t Elkhor n Slough , Mos s Landing Harbor , an dOcea n Areas : Jun e 199 9 through Februar y 2000 .

E9-053. 9 4-2 4 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0Tabl e 4-7 . Mea n Concentration s (#/l,00 0 m 3 ) o f all Larva l Fis h Taxa , Cancer

spp . Megalops , an

dEuropea n Gree n Cra b Megalop s Collecte di

n the Sourc e Wate

r i n th e Vicinit

y ofth e Mos s Landin g Powe r Plant : Jun e 199 9 through Februar y 2000 . Taxo n Agonida e unid . Ammodytes hexapterus Artedius spp . Atherinida e unid . Atherinopsis californiensis Bathylagus ochotensis Bathymasterida e unid . Blennioide i Cebidichthys violaceus Cbaenopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinocottus analis Clupea pailasii Clupeida e unid . Clupeiforme s Coryphopterus nicholsi Cottida e uni d Cottus asper Engraulis mordax Genyonemus lineatus Gibbonsia spp . Gillichthys mirabilis Gobiida e unid . Hexagrammida e unid . Hypsoblennius spp . larval fis h - damage d larval fis h fragmen t tarval/post-larva l fish . unid . Lepidogobius lepidus Leptocottus armatus Leuresthes tenuis Liparis spp . OUgocottus (pp . Osmerida e unid . Oxyiebius picius Paralichthyida e unid . Parophrys vetulus Pleuronectes bilineatus Pleuronectida e unid . Pleuronectiforme s uni d Psettichthys melanostictus Scorpaenichthys marmoratus Sebastes aurora Sebastes diploproa Sebastes jordani Sebastes spp . Sebastes spp . V Sebastes spp . V_D e Sebastes spp . V D Sebastolobus spp . Stenobrachius leucopsarus Sttchaeida e uni d Syngnathida e unid . Tarletonbeania crenularis Xeneretmus latifrons Cancer antennarius (megalops ) Cancer anthonyi (megalops ) Cancer gracilis (megalops) . Cancer jordani (megalops ) Cancer productus (megalops ) Cancer spp . (megalops ) Carcinus maenas (megalops ) Commo n Nam e poacher s Pacifi c san dlanc e sculpin s silverside s jacksmel t popey e Nacksmel t ronquil s blennie s monkeyfac e ee l lub e blennie s Pacifi c sandda b speckle dsandda b wool y sculpi n Pacifi c herrin g herring s herring s an danchovie s Nackey e gob y sculpin s prickl y sculpi n northe manchov y whit e croake r clini dkelpfishe s longja w mudsucke r unidentifie dgobie s ' greenling s Mennie s unidentifie dlarva l fishe s unidentifie dlarva l fishe s unidentifie dlarva l fishe s ba y gob y Pacifi c staghor n sculpi n Califomi agrunio n snailfishe s sculpin s smell s painte dgreenlin g leftey e flounders & sanddab s Englis h sol e rocksol e flounder s flatfishe s lan d sol e cabezo n auror arockfis h splitnos e rockfis h shortbell y rockfis h rockfishe s rockfishe s rockfishe s rockfishe s thomyhead s northe mlampfis h prickleback s pipefishe s Hu e lantemfis h Nackey e poache r

FIS H TOTALS : brow n roc k

cra b yello w roc k

cra b slende r roc k cra b hair y roc k

cra b re droc k cra b unidentifie dcance r

crab s Europea n gree n cra b

CRA B TOTALS : Coun t I

54 7 8 4 0 9 7 1 2 1 7 5 1 1 3 1 2 2 68 3 1 1 1 6 2 4 8 3 8 5 5 39 9 1 21 4 8.68 6 2 23 9 7 18 1 1 2 1,86 1 46 5 I 1 1 21 6 3 2 3 3 8 0 2 7 5 9 1 1 3 1 2 8 2 2 5 8 9 2 63 0 1 2 3 7 1 15.03 8 1 7 2 1 0 11 0 3 2 4 1 16 7 Surve y 1 Jun e 17 . 199 9 Mea n Den . <#/IO0Om3 ) Kirb v Park

Dairie s Harbo r Bridg e N = Coun t

3 4

4 5 36 6 4 2

45 1

0 4 N= 4 N= 4 Den . Coun l Den . Coun t Den . 1 2. 7

2 6. 2 1 4. 3 146. 3 8 23. 0

1 3. 0 .
182. 0 2 2 61 6 1571. 8 14 6 414 3 7 33. 7 17. 3 3 5 99 7 3 1 4 5 1 4. 3 7. 9 2 5. 7

1 6 0

21 7 1 3

0 0 Surve y 2 Jul y 12 . 199 9 Mea n Den . <#/IOOOm3 ) KJirb v Par k pairie s Hartv r Bridg e N = 2 N = 4 N- 3 Coun t Den . Coun l Den . Coun t Den .

1 4. 5

1 5. 7 2 10 2

1 2 141. 0 7 2 845. 7 1 2 49. 2 1 2 58. 3 1 11. 7 3 1 2 4 4 9 253. 5

2 7. 9 2 9. 0 1 5. 0 5 24 9

8 5 1 8 7 2

0 0 0 Surve y 3 Augus t 12 . 199 9 Mean Den . (#/1000m3 > Kirb v Park

Dairie s Hartx T Bridz e N = 4 N= 4 N= 4 Coun l Den . Coun l Den . Coun l Den .

4 I7. |

2 1 0 1 1 4. 8 1 4 57. 4 2 7 137. 3 1 2 53. 2 1 1 3 6 9 6 8 343. 1 1 4 4

1 4. 1 2 7 9 6 1 8

0 0 0
E9-053. 9 4-2 5 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0 toTabl e 4- 7 (continued) . Mea n Concentration s (#/l,00 0 m 3 ) of al l Larva l Fis h Taxa , Cance

r spp . Megalops , an

dEuropea n Gree n Cra b Megalop s Collecte di

n th e Sourc e Wate

r i n th e Vicinit

y ofth e Mos s Landin g Powe r Plant : Jun e 199 9 through Februar y 2000 . Taxo n Agonida e unid . Ammodytes hexapterus Anedius spp . Atherinida e unid . Atherinopsis californiensis Bathytagus ochotensis Bathymasterida e uni d Blennioide i Cebidichthys violaceus Chaenopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinocottus analis Clupea patlasii Clupeida e unid . Clupeiforme s Coryphopterus nicholsi Cottida e unid . Cottus asper Engraulis mordax Genyonemus lineatus Gibbonsia spp . Gillichthys mirabilis Gobiida e unid . Hexagrammida e unid . Hypsoblennius spp . larva l fis h • damage d larva l fis h fragmen t larval/potl-larva l fish . unid . Lepidogobius lepidus Leptocottus armatus leuresthes tenuis Liparis spp . OUgocottus spp . Osmerida e unid . Oxyiebius (rictus Paralichthyida e uni d Parophrys vetulus Pleuronectes btlineatus Pleuronectida e uni d Pleuronectiforme s unid . Psettichthys melanostictus Scorpaenichthys marmoratus Sebastes aurora Sebastes diploproa Sebastes jordani Sebastes spp . Sebastes spp - V Sebastes spp . V_D e Sebastes spp - V D Sebastolobus spp . Stenobrachius leucopsarus Stichaeida e uni d Syngnathida e unid . Tarletonbeania crertularis XeneretmuS lasifrons Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancerproductus (megalops ) Cancer spp . (megalops ) Carcinus maenas (megalops ) Commo n Nam e poacher s Pacifi c san dlanc e sculpin s silvenide s jacksmel t popey e Nacksmel t ronquil i blennie s monkeyfac e ee l tub e Mennie s Pacifi c sandda b speckle dsandda b wool y sculpi n Pacifi c herrin g herring s herring s an danchovie s blackey e gob y sculpin s prickl y sculpi n norther n anchov y whil e croake r dini d kelpfishe s longja w mudsucke r unidentifie d gobie s greenling s blennie s unidentifie dlarva l fishe s unidentifie dlarva l fishe s unidentifie dlarva l fishe s ba y gob y Pacifi c itagho msculpi n Californi agrunio n snailfishe s sculpin s smelt s painte dgreenlin g leftey e flounder s A sanddab s Englis h sol e roc k sol e flounders flatfishes san dsol e cabezo n auror arockfis h splitnos e rockfis h shortbell y rockfis h rockfishe s rockfishe s rockfishe s rockfishe s thomyhead s norther n lampfis h prickleback s pipefishe s Hu e la n le mfis h Nackey e poache r

FI5 H TOTALS : brow n roc k

cra b yello w roc k

cra b slende r roc k cra b hair y roc k

cra b re d roc k cra b unidentifie dcance r

crab s Europea n gree n cra b

CRA B TOTALS : Kirb v Park N > 4 Coun t Den .

2 12. 6 5 0 314. 9 8 53. 7

6 0

0 Ppiric s

N » 4 Coun t Den .

1 6 3

2 12. 7

2 10. 8 1 4 84. 3 9 55. 5 3 1 198. 8

5 9

0 Surve y 4

Septembe r

16 . 199 9 Mean Den . (#/IOOOm3 ) Hartw r Brids e Harbo r

Mout h N * 4 N* 4 Coun t Den . Coun t

Den .

1 5. 0

1 6. 9

1 4. 9 2 13 5

1 4

0 0 Ocea n North N » 4 Coun t Den .

2 5. 1 3 7, 1 1 2. 3

6 1 2 3 2 5. 6 1 8 52 0 1 6 39. 1 3 7 Ocea

n South N = 4 Coun t Den .

1 2. 9 1 2. 9 1 2. 3 1 2 9

4
3 8. 7 3 Kirb v Park

Dairie s N = 4 N = 4 Coun t Den . Coun t

Den . 1 5. 7

1 5. 2

6 32- 1 3 8 131. 7 18 4 965. 8 3 17. 3 2 5 126. 9

2 9. 2 3 1 158. 6

4 1 25 0

0 0 Surve y 5 Octobe r 14 . 199 9 Mean Den . (*/|000m3 ) Harbo r Brida e Harbo r

Mout h Ocea n Nort

h Ocea n South N = 4 N= 4 N= 4 N= 4 Coun l Den . Coun t

Den . Coun l Den . Coun t Den .

1 2. 2 1 2. 4 1 2. 5 1 2. 2 1 2. 0 3 16. 2 6 1 322 4 3 10. 2 2 4. 7 8 44. 9 3 1 0 3 3 6. 9

1 2. 9 1 2. 6 4 8 254. 3 I 3. 4 2 4. 7 1 2. 2

12 0 8 9 5 4 10 8 1 2. 0 1 3. 6 2 4. 5 2 11. 2 1 0 33. 5 2 5. 1 1 3 27. 9 1 2 6 1 2. 0 2 1 1 7 1 7
E9-053. 9 4-2 6 MLP P 316(b ) Resource Assessmen t 4-28-200 0 C OTabl e 4- 7 (continued) . Mea n Concentration s (#/l,00 0 m 3 ) of all Larva l Fis h Taxa , Cancer

spp . Megalops , an

d Europea n Green Cra

b Megalop s Collecte di

n th e Sourc e Wate

r in th e Vicinit

y ofth e Mos s Landin g Powe r Plant : Jun e 199 9 through Februar y 2000 . Surve y 6 Novembe r

18 , 199 9 Mea n Den . (#/IOOOm3 ) Kirb v Par k

ppifie s Harbo r Bridg e Harbo r

Mout h Ocea n Nort

h Ocea n South N « 4 N« 4 Ne 4 N- 4 N = 4 N = 4 Coun t Den . Coun t

Den . Coun t

Den . Coun t

Pen . Coun t

Den . Coun t

Den . Kirb v Par k

Dairie s N = 2 N= 4 Surve y 7 Decembe r

29 . 199 9 Mea i Da v <fl/IOOOm3 ) Harbo r Bridg e Harbo r

Mouth Ocea n Nort h Ocea n Sout h N = 4 N = 4 N = 4 N « 4 Den . Coun l Den . Coun t Den . Coun l Den . Coun l Den . Coun t Den . Agonida e unid . Ammodytes hexapterus Artedius spp . Atherinida e unid . Atherinopsis californiensis Bathylagus ochotensis Bathymaslerida e uni d Blennioide i Cebidichthys violaceus Chacnopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinocottus analis Clupea pallasii Clupeida e uni d Clupeiforme s Coryphopterus nicholsi Cottida e unid . Cottus asper Engraulis mordax • Genyonemus lineatus Gibbonsia spp . Gillichthys mirabilis Gobiida e unid . Hexagrammida e unid . Hypsoblennius spp . larva l fis h - damage d larva l fis h fragment larval/post-larva l fish . unid . Lepidogobius lepidus Leptocottus armatus Leuresthes tenuis Liparis spp . OUgocottus spp . Osmerida e uni d Oxyiebius pictus Paralichthyida e unid . Parophrys vetulus Pleuronectes btlineatus Pleuronectida e unid . Pleuronectiforme s uni d Psettichthys melanostictus Scorpaenichthys marmoratus Sebastes aurora Sebastes diploproa Sebastes jordani Sebastes spp . Sebastes spp . V Sebastes spp . V_D e Sebastes spp . VD Sebastolobus spp . Stenobrachius leucopsarus Stichaeida e uni d Syngnathida e uni d Tarletonbeania crenularis Xeneretmus tatifrons poacher s Pacifi c san dlanc e sculpin s silverside s jacksmel t popey e Nacksmel t ronquil i Mennie s monkeyfac e ee l tub e Mennie s Pacifi c sandda b speckle dsandda b wool y sculpi n Pacifi c herrin g herring s herring s an danchovie s Nackey e gob y sculpin s prickl y sculpi n norther n anchov y whit e croake r clini dkelpfishe s longja w mudsucke r unidentifie dgobie s greenling s blennie s unidentifie dlarva l fishe s unidentifie dlarva l fishe s unidentifie dlarva l fishes bay gob y Pacifi c staghor n sculpi n Califomi agrunio n s o ail fishe s sculpin s smell s painte dgreenlin g leftey e flounder s & sanddab s Englis h sol e roc k sol e flounders flatfishes san dsol e cabezo n auror arockfis h splitnos e rockfis h shortbell y rockfis h rockfishe s rockfishe s rockfishe s rockfishe s thomyhead s norther n lampfis h prickleback s pipefishe s Nu e lantemfts h Nackey e poache r 8 44. 9 2 7 152. 0 31. 6 1064 9 7. 3

116. 2 7

12 7
3 1 2 1 26 4 490 6
11 4 45. 8 4. 6 1 3

1 4 4 32. 2

2 1 8. 3 8. 3 12. 7 399, 6 6

10 2 .13. 8 844. 9 2

3 0 11 3 166 8

24. 7 124. 0 25. 6 62. 7

2

1 7 3 1 4 0 3 I

4 5 2 5 2. 0 10. 3 11. 4 57. 2

FIS H TOTALS : 2 5 2 0 Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancerproductus (megalops ) Cancer spp . (megalops ) Carcinus maenas (megalops ) brow n roc k cra b yello w roc k

cra b slende r roc k cra b hair y roc k

cra b re d roc k cra b unidentifie dcance r

crab s Europea n gree n ga b 2 5 3 4. 2 124. 0 2

1 4. 2 2. 2

E9-053. 9 4-2 7 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0Tabl e 4- 7 (continued) . Mea n Concentration s (#/l,00 0 m 3 ) o f all Larva l Fis h Taxa , Cancer

spp . Megalops , an

dEuropea n Gree n Cra b Megalop s Collecte di

n th e Sourc e Wate

r i n th e Vicinit

y ofth e Mos s Landin g Powe r Plant : Jun e 1999 through Februar y 2000 .
Taxon Agonida e mid . Anttnodytes hexapterus Anedius spp. Atherinida e unid . Atherinopsis californiensis Bathylagus ochotensis Bathynuslerida e uni d Blennioide i Cebidichlhyt

violaceus Qtaenopsida e unid . Citharichthys sordidus Citharichthys stigmaeus Clinocottus analis Clupea pallasii Clupeida e unid . Clupeiforme s Coryphopterus nicholsi Cotlids e unid . Cottus asper Engraulis mordax Genyonemus lineatus Gibbtmsia spp . Gillichthys mirabilis Gobiida e unid . Hexagraimnida e uni d Hypsoblennius spp . larva l fis h - damaged larva l fis h fragmen

t larval/post-larva ] (ish . unid . Lepidogobius lepidus Leptocoaut

armatus Leuresthes tenuis Liparis spp. Otigocoaus spp . Osmerida e uni d Oxyiebius pictus Paralichthyida e uni d Parophrys vetulus Pleuronectes bilineatus Pleuroncctida e tnid . Pleuronectiforme s uni d Psettichthys melanostictus Scorpaenichthys marmoratus Sebastes aurora Sebastes diploproa Sebastes jordani Sebastes spp . Sebastes spp . V Sebastes spp . V_D e Sebastes spp . V D Sebastolobus spp . Stenobrachius leucopsarus Stichaeidaeuni d Syngnathida e unid . Tortelottbeania crenularis Xeneretmus latifrons Cancerantennarius (megalops ) Canceranthonyi (megalops ) Cancergracilis (megalops ) Cancer jordani (megalops ) Cancerproductus (megalops ) Cancerspp . (megalops ) Carcinus maenas (megalcsps ) Cofitmon Nam e paadKr s Pacifi c san d lanc e sculpin s silverside s jacksmel t popey e Nacksmel t ronquil s blennie s monkeyfac e ee l tub e blennie s Pacifi c sandda

b speckle d sanddab woolysculpi n Pacifi c herrin g herring s herring s and anchovie s blackey e gob y sculpin s prickl y sculpi n norther n anchov y whil e croake r clini d kelpfishe s longja w mudsucker unidentifie d gobie s greenling s blennie s unidentifie d larva] fishe s unidentifie d larva

l fishes unidentifie d larva

l fishe s ba y gob y Pacifi c staghor

n sculpi n Californi a grunio n snailfishe s sculpin s smelt s painted greenlin g leftey e flounders A sanddab s Englis h sol e rocksol e flounder s flatfishe s san d sol e cabezo n auror a rockfis h splitnos e rockfis h shonbell y rockfis h rockfishe s rockfishe s rockfishe s rockfishe s thomyhead s norther n lampfis h pricklebacks pipefishe s blu e lantemfis h Mackeye poache r

FISH TOTALS : brow n roc k cra b yello w roc

k cra b slende r roc

k cra b hair y roc k cra b red roc k aa b unidentifie d cance r crab s Europea n green cra

b CRA B TOTALS : KirtivPark

N = 4 Coun tDen .

5 29. 2 1 4. 7

3 17. 2 3 4 191. 8 1 4. 4 1 4. 7 3 16. 0 2 0 93. 3

1 4. 4

6 9

0 Survey s Januar y 20 . 200 0 Mea n Den . (I/I000m3 ) Dairie s Harbo

r Bridn e HarborMouth Ocea n Nort h Ocea n Sout

h N = 4 N = 4 N a Coun tDen . CountDen . Coun t 1 1 1 4. 1

4 14. 8 1 3. 7 3

1 6 6 1

1 1 7. 1 1 6 6 2 5 3 309. 6 6 4 388. 2 7 3 5 7 32. 2 4 25. 2 2 0

3 19. 7 1 2 12. 0 3

3

1 3. 1 1 5. 7 2

6 9 7 7 11 6

0 0 0 4 N = 4 N= 4 Den . CountDen . Coun l Den . 4. 2 1 2. 7 7. 3
1 2. 1

15. 2 7. 3 6. 1 1 2. 3 1 2. 0 11 6 1 2 0 423. 1 1 2. 3 1 9 37. 8 1 2. 2 23. 5 129. 7 1 4 27. 7 6. 1 8 19. 4 15. 9

17. 2 2 4. 0

2 4. 8 6 14 4 7 1 6 1 5 10. 8 9. 7 1 9 44. 7 3 6 9

1 2. 0 4 3 4 8

O 0 KirWPi»| t N = 4 CcuntDen . 1 1 4 7 0 3 13. 7

33 1 1471. 3

1 4. 7 12 52. 5 3 7 163. 4 20 7 918 2

5 9 232. 1

66 1

0 Dairie s

N = Count 2 1 3

1 3 2 5 9 6 8

3 2 1 1

5 1 1

1 5

13 2

0 4 Den . 7. 4 3. 5 8. 4

4 6 10 9 9. 3 24. 4 26 6 255. 3

10. 9 74. 7 4. 6
24. 8 5 0 4. 6

5 0 20 9 Surve y 1 3

Februar y 24 . 200 0 Mea n Den . («/KI00m3 ) Harbo r Bndst e Harbo

r M N = 4 N= 4 CountDen . Coun

l
1

1 6 4 1 3 8 2

2 9 47. 8 7 1 3. 1 2 1 3. 8 1 5 27. 4 3 1 3 6 9 1 3 0 2 10. 2 3 19 3 945. 6 28 3

1 9 43. 8 7

1 4 21. 7 4 1 0 45. 2 6 9 45. 1 10

1 1 52 9 1 6

1 6 4 1 1 6 1 1

1 1 6 1 2 1 0 51 2 14 2 8 148. 4 6 6 2 11 5 6 31 2 47 0

1 1 0 2 out h Den 4. 7

8. 8 9. 4 30. 7 9 0 4. 7 13. 5 133. 8 12. 3 256. 7 4. 1 31. 0 4. 7 18. 5 27 0 45. 1
73. 1

4. 3 4. 9 4. 3 8. 2 62 6 293. 7 26 0 4. 7 4. 7 Ocea n Non h

N = Counl 2 1

3 3 1 1 1 1 3 5 2 3 7 8 4 1

1 0 6

1 2 0 1 3 2 4 31 1 1 4 31 0

0 4 Den . 50. 1

6. 0 9 6 2 2 1 8 1 8 2. 4 82. 4 51. 3 14. 9 16 7 8. 4 1.8
26. 8 10. 8

2. 4 42. 9 26. 3 50. 0 647. 6 30. 2 Ocea n Sout

h N = Count 1 1

2 1

1 2 3 S O 1 3 1 1 1

5 3 1 3 3 9 9 2 4 13 8 1 2 35 9

0 4 Den . 1. 8 1.8

3. 9 2. 8

2. 1 49. 0 178 0 28 3 1. 8 2 8 2. 2

10 8 6 3 2. 1 5. 8 86 8 20 4 52. 0 289. 9 26. 1

E9-053. 9 4-2 8 MLP P 316(b ) Resourc e Assessmen t 4-28-200 0P.9 5 

# I 1 1 4. 0 Entrainmen t an d Source Wate r Results



# 1 I I I 1 I 1 I I 1 1 1 1 I 4. 3 0©boodla© o 1 1 unit md m Gobie s belon g t o asuccessfu l famil y (Gobiidae ) o f small , demersa l fishe s tha t ar e foun d worldwid e i n shallo w tropica l an dsubtropica l environments . Th e famil y contain s aroun d1,87 5 specie s in 21 2 gener a(Nelson , 1994 ; Moser , 1996) . Th e Famil y Gobiida e i s secon donl y t o th e Famil y Cyprinidida e (minnows ) in tota l number s o f specie s (Moyl e an dCech , 1988) . Twenty-on e gob y specie s fro m1 6 gener aoccu r i n th e Californi aCooperativ e Oceani c Fisherie s Investigation s (CalCOFI ) stud y area , fro mth e norther n Californi aborde r t o south o f

Baj a Californi a(Moser , 1996) . Member s o f

th e gob y famil y shar e avariety o f distinguishin g characteristics . Thei r bod y shap e i s elongat e an dca

n b e eithe r

somewha t

compresse do r

depresse d(Moser , 1996) . Mos t member s ofth e famil y lac k

both alatera l lin e an dswi mbladde r (Moyl e an dCech , 1988) . Gobie s generall y hav e tw o dorsa l fins , th e firs t consistin g o f

2 t o 8 flexibl e spine s an dth e secon d containin g aspin e an dsevera l segmente dray s (Moyl e an dCech , 1988 ; Moser , 1996) . Thei r cauda l fi n i s rounde dan dthei r

pelvi c fin s ar e typicall y joine dt o for macup-lik e dis c (Moser , 1996) . Th e eye s o f mos t gobie s ar e relativel y larg e an dar e adominan t featur e o f

thei r blun t head s (Moyl e an dCech , 1988) . Gob y specie s ar e extremel y variabl e i n coloration . The y rang e fro mth e drab , crypticall y colore dspecie s that inhabi t mudflat s t o th e striking , brightl y colore dspecie s o f

tropica l an dsubtropica l reef s (Moser , 1996) . On e o f th e mos t importan t

characteristic s o f

th e gob y famil y i s thei r

smal l size . Th e smallest know n vertebrate , whic h i s matur e a t 8 t o 1 0 mm(0.3 t o 0. 4 in.) , i s agob y specie s Trimmatom nanus fro mth e Chago s Island s i n th e India n Ocea n (Moyl e an dCech , 1988) . Th e yellowfi n gob y Acanthogobius flavimanus, a n introduce dspecie s tha t i s nativ e t o China , i s th e larges t gob y specie s foun dalon g th e Californi acoast . I t reache s amaximu mtota l length (TL ) o f aroun d24 1 m m(9. 5 in.) (Mille r an dLea , 1972) . Du e t o thei r siz e an devolve dtolerance s fo r a variet y o f environmenta l conditions , gobie s hav e bee n abl e t o coloniz e habitat s tha t ar e inaccessibl e t o mos t

othe r fishe s (Moyl e an dCech , 1988) . Thes e includ e crack s an dcrevice s i n cora l reefs , invertebrat e burrows , mudflats , mangrov e swamps , freshwate r stream s o n oceani c island s an dinlan dsea s an destuarie s (Moyl e an dCech , 1988) . Gobie s generall y occu r

i n shallo w marin e habitats , howeve r man y member s o f

th e famil y ar e euryhalin e an dar e abl e t o tolerat e very lo w salinitie s an deve n freshwater . Gobie s ar e often th e principa l freshwate r

fis h specie s o n oceani c island s an dar e commo n i n man y o f th e river s an d stream s i n Asi a(Moyl e an dCech , 1988) . A gob y specie s Pandaka pygmaea fro mLuzo n (Philippines) , whic h i s matur e a t 1 0 t o 1 2 m m(0. 4 t o 0. 5 in.) , i s th e world' s smalles t freshwate r fish . A numbe r

o f gob y specie s als o hav e th e ability t o surviv e ou t o f th e wate r

b y "breathing " air . Th e longja w mudsucke r Gillichthys mirabilis can surviv e fo r day s ou t o f wate r if kep t moist , E9-053. 9 4-2 9 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.9 6 

# 1 4. 0 Entrainmen t an d Sourc e Wate rResult s 

# 1 1 1 1 I 1 I I 1 I I I 1 1 1 I an dth e mudskippe r Periopthalamus spp . regularl y leave s th e wate r t o forag e fo r

terrestria l insect s amon g mangrov e root s an dexpose drock s (Moyl e an dCech , 1988) . Gobie s ea t avariet y o f larval , juvenile , an dadul t crustaceans , mollusks , an dinsects . Man y wil l als o ea t smal l fishes , fish eggs , an dfis h larvae . Gobie s fro mth e genu s Gobisoma ar e know n t o "clean " othe r fishes o f ectoparasites . I n what

coul db e define da s aparasiti c relationship , on e grou p o f gobie s feed s o n th e tub e feet

o f thei r se aurchi n host s (Teylaud , 1971) . Gobie s ar e oviparou s an dproduc e demersa l egg s whic h ar e generall y elliptica l i n shap e (Moser , 1996) , typicall y adhesive , an dar e attache dt o th e nes t substrat e at

on e end . Parenta l care , ofte n provide db y th e male , i s commo n i n th e famil y (Moser , 1996) . Hatche dlarva e ar e planktonic . Th e duratio n o f

th e planktoni c stag e varie s greatl y withi n th e family . Larva l gobiid s ar e distinctiv e an dno t

easil y confuse dwit

h othe r fish larvae . Exception s includ e certai n lif e stage s o f eleotrid s an dscarid s (Moser , 1996) .
Identificatio n o f

larval gobiid s t o th e specie s leve l i s difficult . Larva l gobie s collecte ddurin g MLP P entrainmen t

samplin g that

coul dno t

b e identifie dt o th e specie s leve l wer e lef t a t th e famil y leve l (Gobiidae ) an dar e probabl y compose dof som e combinatio n o f

th e followin g species : arro w gob y Clevelandia ios, cheekspo t gob y Ilypnus gilberti, an dth e yellowfi n gob y Acanthogobius flavimanus. At certai n larva l stages , bay gob y Lepidogobius lepidus ma y shar e simila r taxonomi c character s makin g i t difficul t t o separat e fro mth e othe r species , especiall y whe n th e specimen s ar e no t i n goo dcondition . Myomer e count s an ddorsa l pigmentatio n characteristic s ca n b e use dt o identif y man y larva e t o th e specie s leve l (Moser , 1996) . A numbe r o f specie s canno t

b e separate dunequivocall y durin g certai n larva l stage s (Moser , 1996) . Th e arro w gob y Clevelandia ios, cheekspo t gob y Ilypnus gilberti, an dth e shado w gob y Quietula y-cauda canno t b e differentiate ddurin g an y larva l stag e (Moser , 1996) . However , th e know n rang e ofth e shado w gob y Q. y-cauda extend s onl y a s fa r north a s Morr o Ba y in centra l California . Adul t shado w gobie s wer e not foun di n arecen t

stud y o f fishe s i n th e vicinit y o f

th e MLP P (Lindquist , 1998) . Brother s (1975 ) reporte ddifficulty i n separatin g arro w gob y fromcheekspo t gob y tha t

wer e les s than 6 5 m m(2. 6 in. ) i n length . Th e arro w gob y C . ios an dth e cheekspo t gob y / . gilberti hav e overlappin g range s an doccup y simila r habitats . Bot

h specie s inhabi t

burrow s i n mu dflat s an dothe r shallo w region s o f

bay s an d estuarie s (Mille r

an dLea , 1972) . Th e fecundity o f th e arro w gob y (75 0 t o 1,00 0 eggs ) an dth e cheekspo t gob y (25 0 t o 1,800 eggs ) ar e simila r (Wang , 1986) . Egg s ar e demersa l an dadhesive , with filament s fo r

anchorin g t o substrate s (Wang , 1986) . N o fecundity informatio n i s availabl e for th e shado w goby . Th e northern rang e o f th e cheekspo t

gob y extend s t o Tomale s Ba y (Mille r an dLea , 1972) . Arro w gob y occup y th e mos t extensiv e rang e (o f

th e three) , occurrin g fro mth e E9-053. 9 4-3 0 MLP P 316(b ) Resourc e Assessmen t 4-28-200 04. 0 Entrainmen t an d Sourc e Wate r Results



### Gul f o f Californi at o Vancouve

r Island , Britis h Columbi a(Mille r andLea , 1972) . Arro w gob y ar e commo n i n th e Mos s Landing-Elkho mSloug h are aan dprobably accoun

t fo r amajorit y o f th e unidentifie dlarva

l gobie s collecte ddurin g MLP P entrainmen

t sampling . Th e cheekspo t gob y ha s bee

n documente di

n th e are aan

dma y compos e aportio n o

f the Gobiidae category . Sinc e i t appear s tha

t arrow gob

y ma y accoun t fo r alarg e portion o

f th e larvae identifie da s Gobiidae , it s demograph

y wil l b e usedt o estimat e entrainmen

t effects . Brother s (1975 ) estimate datwo-mont

h mortalit y fo r arro w goby larva

e o f 98. 3 percent . Combinin g thi s estimat e wit h species-specifi c fecundit

y an da n assumptio n o

f stabl e ag e distribution , allowe du s to calculat e th e numbe

r o f adult s potentially affectedb y larva l entrainmen

t mortality . Endangere dtidewate

r gob y Eucyclogobius newberryi adult s wer e recentl y collecte di

n Bennet t Sloug h i n Octobe r 199 9 (M . Sazaki , CEC , pers . comm.) . Larva l tidewate r gob y ca n be distinguishe dfro

mothe r gobie s an dnone wer

e collecte ddurin g an

y entrainmen

t o r sourc e wate

r survey s a t MLPP . 

### 4.3.2 Unidentified

goby results (53.2 percent) Unidentifie dlarva

l gobie s comprise d53. 2 percen t o f th e tota l numbe r o f fishe s collecte di

n entrainmen

t sample s fro

mthe ne w C C unit s intak

e (Figur e 4-1) . They wer

e collecte di

n al l entrainmen

t survey s fro

mMarc h 2,199 9 through Februar

y 24 , 200 0 fro

mi n fron t ofth e intak

e o f ne w C C unit s (Figur

e 4-6) . Pea

k concentratio n (1,799/1,00 0 m3 

### ) occurre do n Novembe

r 4 , 199 9 an dth e lowes t

concentratio n (43/1,00 0 m 3 

### ) occurre do n Augus t 12,1999 . The diel distribution s wer

e plotte dfo

r concentration s o

f larva l unidentifie dgobie s collecte di n fron t o f th e ne w combined-cycl e unit s intak e (Figur e 4-7) . W e analyze donly th e entrainmen t survey s tha

t coincide dwit

h the sourc e wate

r survey s fro

mJun e 199 9 through Februar y 2000 . Unidentifie dgobie s wer

e typicall y collecte di

n highes t concentration s durin g th e nighttime betwee n 220 0 an d030 0 hour s PS T except

fo r th e Octobe

r 1999 , an dJanuar y andFebruar

y 200 0 surveys . I n Octobe r 199 9 an dJanuar y 2000 , th e pea

k die l concentratio n occurre dafte r sunse t a t approximately 183 0 hour s PST . I n Januar y 2000 , th e pea

k diel concentratio n occurre ddurin g dayligh t a t 103 5 hours , andi

n Februar y 200 0 th e pea

k occurre da

t daw n (062 7 hours) .

E9-053. 9 4-3 1 MLP P 316(b ) Resource Assessmen t 4-28-200 04. 0 Entrainmen t an d Source Wate r Results
Unidentifie

d Gobie s Entrainmen

t Mea n Concentratio n
1,80 0

E MO O

8 g 80 0 

# fi 

# a

••-•I I fffff*f««.ffff_rt*£fct.i£ff?g;?ffff]Fffff?»»skf;i i * B » 8 B » "

* i * B = * « - » B j i j 1 j , " « ; * - S j 8

__

; s ——M Note : Al l dat aar e preliminary . Figur e 4-6 . Mea

n surve y concentration s (#/l,00 0 m 3 ) o f larva l unidentifiedgobie s a

t th e Mos s Landing Powe r Plan t ne w combined-cycl e unit s intake : Marc h 1999 throug

h Februar y 2000 . Unidentifie

d Gobie s Larva l Entrainmen

t Die l Mea

n Concentratio n

—2.50 0 E § E 2,00 0

1



# . E 1 •

... . —• • 

## . 1 H . 

### I



# l l l l .!• ! 

# 1 . 1



# .iL n • i 

# ll . Bana^'uss a Au g 1 2 _t»t!S B -'B»!l« s "88SI I Se p 1 6 Oc

t 1 4 Nov K 2*8S--8S8S"~SBSS - Note : Thes e entrainmen t survey s wer e conducte da t th e sam e tim e a s th e sourc e wate r surveys . Dat aar e preliminary . Figure 4-7 . Concentration s (#/l,00 0 m 3 ) o f larva l unidentifiedgobie s a

t th e ne w combined-cycl e unit s intak e separate db

y sample collectio n tim

e (PST) : June 1999 throug

h Februar y 2000 . E9-053. 9 4-3 2 MLP P 316(b ) Resource Assessmen t 4-28-200 0P.9 9
4. 0 Entrainmen t an d Source Wate r Results Larva l unidentifie dgobie s wer e th e mos t abundantl y collecte dtax afro mth e Elkhor n Slough , Mos s Landin g Harbor , an dth e Ocea n areas . A s previousl y stated , adult s o f both arro w (C . ios) an dcheekspo t

(/ . gilberti) gobie s an dhav e bee n documente di n th e area . I t i s likel y tha t

som e o f thes e unidentifie dgobie s ar e represente db y thes e species , althoug h th e larva l form s a t certai n stage s canno t

b e distinguishe dfromon e another . Mean concentration s (#/l,00 0 m 3 ) o f unidentifie dgobie s fo r

al l stations , b y tida l cycl e ar e presente di n Figur e 4-8 . Unidentifie dgobie s comprise d6 0 percen t ofth e tota l larva l fishe s collecte di n th e Elkhor n Sloug h area , 4 8 percen t

i n th e Mos s Landin g Harbo r area , an d3 6 percen t

i n th e Ocea n are afro m Jun e 199 9 throug h Februar y 2000 . Unidentifie dgobie s wer e collecte dever y month (Figur e 4-8) . The y wer e collecte dfro mall station s sample dfro mJun e throug h Decembe r 199 9 excep t

in Septembe r

an dOctobe r

1999 , whe n the y di dno t occu r a t th e Harbo r

Bridg e (Septembe r

only ) an dOcea n North stations . Peak s in concentration s fo r both th e lo w tide s an dhig h tide s occurre d i n th e Elkhor n Sloug h area ; hig h tid e concentration s peake d(2,913/1,00 0 m 3 ) i n Kirb y Par k in Jun e 199 9 an d th e lo w tid e pea k concentratio n (1,682/1,00 0 m 3 ) occurre da t th e Kirb y Park

i n Februar y 2000 . Unidentifie dgobie s wer e collecte da t bot h hig h an d lo w tide s fro mal l station s i n Novembe r

199 9 an dFebruar y 2000 . (Figur e 4-8) .
Unidentifie d Gobie s Sourc e Wate r Mea n Concentration s

1,000 B Hig h

• Lo w

5 

### I 3 S c 8 

### I 

### I s OO O OO O oo o 

# J

Ju n 1 6 Ju l 1 2 Au g 1 2 Se p 1 6 Ocl1 4 No v 1 8 De

c 2 9 Ja n 2 0 Fe b 24 Key— KP: Kirb y Park ; D : Dairies ; HB : Harbo r Bridge ; HM : Harbo r

Mouth ; ON : Ocea n North ; OS : Ocea n Sout h O Station s not

include di n stud y desig n unti l September . © Sample s voide ddu e t o imprope r preservation . Figur e 4-8 . Sourc e wate

r concentration s (#/l,00 0 m 3 ) o f larva l unidentifiedgobie s a

t si x station s nea

r Mos s Landing Powe

r Plant : Jun e 1999 throug

h Februar y 2000 . E9-053. 9 4-3 3 MLP P 316(b ) Resource Assessmen t 4-28-200 0