# -0-, DE Q State o f Orego n Departmen t o f Environmenta l Qualit y 

# Nationa l Pollutan t Discharg e Eliminatio n System PERMI T EVALUATIO N AN D FAC T SHEE T

Ma y 28 , 200 4 

# Orego n Departmen t

o f Environmenta l Quality Western Regio n 75 0 Fron t S t NE , Suit e 120 Sale mO R9730 1 (503 ) 378-824 0

Permittee :

Curren tPermit :

Sourc e Information :

Sourc e Contact : Propose d Action :

Permi tWriter : Cit y o f Woodbu m 281 5 Molall aRoa

d Woodbum , O R9707 1 Fil e Number : 9881 5 NPDE S Permi t

Number : 10158 8 EPA Referenc e Number : OR002000- 1 Issu e Date : March 31 , 199 8 Expiratio n Date : Februar

y 28,200 3 Woodbu mPOTW 281 5 Molall aRoa

d Woodburn , Orego n Latitud e 45 ° 9.255 ' North , Longitud e 122 ° 4 8 41 8 Wes t Fran k Sinclair , POT

W Superintenden t Phone : 503-982-528 0 NPDE S Majo r

Domesti c Permi t

Renewa l Applicatio n Number : 98522 8 Dat e Received : Septembe r 6 , 200 2 Mar k E , Hamli n Phone : 503-378-8240 , extensio n 23 9Cit y o f Woodbu m NPDE S Renewa l Evaluatio n Repor t

INTRODUCTIO N Th e Cit y o f Woodbu mown s an doperate s a n advance dsecondary wastewate r treatmen t

facility locate d nea r Woodbum , Orego n (se e Figur e 1) . Municipal wastewate r i s treate dan ddischarge dt o th e Puddin g Rive r in accordanc e wit h Nationa l Pollutan t Discharg e Eliminatio n Syste m(NPDES ) Permi t numbe r 101588 . Th e Permi t

for th e facility wa s issue don Marc h 31 , 199 8 an dexpire do n February 28 , 2003 . Figur e 1
y sc . 'in •-•> \) /

-- -

Treatmen t Plan t 

# 'T- V K-tF , 

# " 4 'Yi-YJtfmM .'••* » '( I Al 7 '



## N

.r , t I 

### ^ fc * ' , \i - . . - > <• .

Th e Departmen t

receive darenewa l applicatio n o n Septembe r 6 , 2002 , Th e permi t

shal l no t b e deeme d t o expir e unti l final actio n ha s bee n take n o n th e renewa l applicatio n a s pe r Orego n Administrativ e Rule s (OAR ) 340-045-0040 . A renewa l permi t i s necessary t o discharg e t o stat e water s pursuan t t o provision s o f Orego n Revise dStatute s (ORS ) 468B.05 0 an dth e Federal Clean Wate r Act , Th e Departmen t propose s t o rene w th e permit . Thi s permi t evaluatio n report

describe s th e basi s an dmethodolog y use di n developin g th e permit . Thi s permi t

i s ajoin t

federa l an dstat e permi t an dsubjec t

to federal an dstat e regulations . Th e Clean Wate r Act , th e Cod e o f

Federa l Regulations , an dnumerou s guideline s o f th e Environmenta l Protectio n Agenc y provid e th e federal permi t requirements . Th e Orego n Revise dStatutes , Orego n Administrativ e Rules , an dpolicie s an dguideline s o f th e Departmen t

o f Environmenta l Quality provid e th e stat e permittin g requirements .

PAG E 2Cit y o f Wooclbur n NPDE S Renewa l Evaluatio n Repor t

FACILIT Y DESCRIPTIO N Th e treatmen t

facility serve s th e entir e City o f Woodbu mwit

h th e exceptio n o f

som e isolate dresidences . Som e servic e i s provide dt o th e Orego n Yout h Authority outsid e th e City' s limits . Th e complete d wastewate r

treatmen t

facility fo

r th e desig n year

202 0 i s bein g buil t

i n tw o phase s o f

construction . Th e City complete dPhas e 1 o f th e facility upgrad e i

n Jun e 2001 . Phas e I

I wil l b e constructe dwhe n require d b y increase dflo w o r

loading . Th e previou s Rotatin g Biologica l Contacto r (RBC ) facility wa s mostl y abandone ddurin g th e phas e 1 upgrade , Th e facility (se e Attachmen t #1 ) consist s o f

headwork s wit

h screenin g an ddegritting , primar y clarification , anoxi c selecto r activate dsludg e secondary treatmen t an dclarification , effluent filtratio n an dultraviole t

(UV ) disinfectio n with discharg e t o eithe r th e Puddin g Rive r

o r apoplar tre e plantation . Sludg e i s anaerobieall y digested , store di n facultativ e sludg e lagoon s an dlan dapplie do n th e popla

r plantation . Th e treatmen t facility headwork s ha s tw o mechanica l ba r screen s wit

h ascreening s compactor . Gri t

fro mth e tw o gri t

chamber s i s classifie dwit h acyclon e gri t

separator . Fou r

primar y clarifier s perfor

mprimary sedimentatio n (tw o fo r normal operatio n an dtw o for we t weathe r operation) . Secondary treatmen t

i s performe db y two , anoxi c selecto r activate dsludg e aeratio n basin s an dthre e secondary clarifiers . Th e effluen t i s filtere dby tw o continuou s backwas h filter s capabl e o f handlin g 3.3 3 MGD . Disinfectio n i s performe db y U V ligh t i n tw o U V channel s prio r

t o discharg e t o th e Puddin g Rive r an d irrigatio n o f

th e poplar

plantation . Phas e I i s capabl e o f disinfectin g u p t o 1 2 MGD . Th e chlorin e contac t chamber s fromth e ol dRB C facility wer e retaine dfor us e a s a n irrigatio n pump statio n we t well . Sodiu mhypochlorit e i s occasionall y injecte ddownstreamo f th e irrigatio n pump s t o clean th e irrigatio n system . Treate deffluent ca n b e discharge dt o th e Puddin g Rive r or beneficiall y reuse da s Leve l H I reclaime dwate r

o n 8 8 acre s o f

popla r trees , Additional popla r tre e acreag e (u p t o 24 0 acres ) ca n b e adde da s needed . Flo w monitorin g i s provide dat th e influent , effluen t

an dirrigation . Th e 14, 3 acr e bentonit e line dlagoo n wit h acapacit y o f

3 7 millio n gallon s i s use dfor reclaime dwate r

storage . Digeste dsludg e i s pumpe dfromth e tw o primar y digester s t o tw o facultativ e sludg e lagoon s adde d durin g Phas e I , Th e sludg e lagoon s ca n b e dredge dinto aday tan k for lan dapplicatio n a s biosolid s o n th e poplar plantatio n durin g th e summer . Th e sludg e dryin g bed s fromth e RB C facility wer e retaine dfor bac k u p operation , A thir danaerobi c digeste r ca n b e adde dwhe n necessary . Th e facility regularl y receive s septag e at

aseptag e receivin g station . Th e Phas e I desig n averag e dry weathe r flo w (ADWF ) i s 3.3 3 millio n gallon s pe r

day (MGD ) whil e th e desig n averag e we t weathe r flo w (AWWF ) i s 4. 8 MGD . Th e desig n loading s ar e show n i n Tabl e I . Table 1: Phase I

Design Loadings
CBOD s TS S Dr y Weathe r Desig n Loadin g (lb/day ) Dail y Averag e 720 0 650 0 Monthl y Ma x

950 0 840 0 We t

Weathe r Desig n Loadin g (lb/day ) Dail y Averag e 640 0 670 0 Monthl y Ma x

730 0 830 0 In Phas e II , a

n additiona l ba

r screen , gri t

chamber , cyclon e separator , primar y clarifier , aeratio n basin , secondary clarifier , effluent filter an dU V channe l wil l b e added . Th e disinfectio n capacity wil l b e increase dt o 1 8 MGD . Th e pea k hydrauli c capacity i s rate dat 16. 0 MG D base don th e Mil l Creek pum p statio n pum

p capacity . Th e Phas e I I ADW Fwil l b e 5.03 7 MG D an dth e desig n AWW Fwil l b e 7. 3 MGD . Th e desig n loading s ar e show n i n Tabl e 2 PAG E 3

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t
Table 2; Phase II

Design Loadings
CBOD 5 TS S Dr y Weathe rDesig n Loadin g (lb/day )

Dail y Averag e 1140 0 1050 0 Monthl y Ma x

1480 0 1340 0 We tWeathe rDesig n Loadin g (lb/day )

Dail y Averag e 1010 0 1080 0 Monthl y Max

1150 0 1330 0 Th e facility i s unmanne dat night , bu t

ha s 24-hou r

alarmtelemetr y throug h th e treatmen t plant . Th e facilit y ha s standb y electri c generatio n at th e treatmen t

plant . Al l bu t

tw o lif t station s ar e or

wil l hav e redundan t powe r (fixe dor

mobil e electri c generators) . Thi s permi t include s arequiremen t

t o instal l redundan t powe r capability at

th e tw o lif

t station s that

canno t currentl y b e serve db y mobil e generators . Durin g th e las t

tw o dry season s (2002 an d200 3 fromMay 1 throug h Octobe r 31) , th e plan t

receive dan averag e o f

1.7 6 MG D o r

5 3 percen t

o f th e Phas e I hydrauli c capacity . Summe r plan t loadin g average d5 5 percen t o f th e Phas e I CBOD s organic capacity an d6 8 percen t o f th e TS S capacity . Th e maximu m CBOD 5 loadin g (52.5 % o f th e maximu mmont

h design ) occurre ddurin g Jul y 200 3 whil e th e maximu m TS S loadin g (79 % o f

th e maximu mmont

h design ) occurre dSeptembe r 2002 . Plan t flow s durin g th e winte r

ar e weathe r

dependant . Durin g th e las t tw o we t weathe r period s (2002/0 3 an d2003/0 4 fromNovembe r 1 thoug h Apri l 30) , th e plan t receive da

n averag e o f

2.8 8 MG D o r

6 0 percen t o f th e Phas e 1 hydrauli c capacity . Winte r plan t loadin g average d7 0 percen t o f th e Phas e I CBOD 5 organi c capacit y an d7 5 percen t o f th e TS S capacity . Th e maximu mCBOD 5 loadin g (73 % o f th e maximu mmont

h design ) occurre ddurin g Decembe r 200 2 whil e th e maximu mTS S loadin g (86 % o f th e maximu mmont

h design ) occurre dJanuary 2003 , Sinc e start

u p o f th e Phas e I facility , n o modification s hav e bee n mad e t o th e facility , Biosolid s Managemen tan d Utilizatio n Al l wast e sludg e mus t

b e manage di

n accordanc e wit

h th e Departmen t

approve dBiosolid s Managemen t Plan (BMP ) t o ensur e complianc e with th e federal biosolid s regulation s (4 0 CF RPart 503 ) an dth e stat e rule s (OAR340-050) , Th e City' s BM P wa s originall y approve dDecembe r 10 , 1987 . Th e Departmen t propose s t o approv e ane w BM P with thi s permi t actio n Th e biosolid s consistentl y mee t th e vecto r

attractio n an dClas s B pathoge n reductio n requirement s i n 4 0 CFRPart 503 , Afte

r treatmen t

necessai y t

o comply wit

h vecto r attractio n andpathoge n reductio n requirements , th e biosolid s ar e beneficiall y landapplied . Th e update dplan include s sit e selectio n criteri a for lan dapplicatio n o f

Clas s B biosolids . Th e sit e selectio n criteri ainclude s al l o f western Oregon , Th e Departmen t

i s proposin g t o approv e th e pla n (se e Attachmen t#2) , Woodbum' s treatmen t

work s produce s biosolid s fro mprimar y clarifie r solids , wast e activate dsludge , an d septage . Th e wast e activate dsludg e i s thickene dusin g dissolve dai r floatation . All thre e sewag e soli dtype s ar e blende dtogether

i n ablen dtank

befor e pumpin g t o th e tw o primar y digesters . Sludg e i s digeste dfo r a minimu mmea

n cel l residenc e tim e o f

betwee n 1 5 an

d60 day s a

t aminimu mtemperatur e betwee n 3 5 an d 5 5 degree s centigrade . Digeste dsolid s are store di n tw o 2. 5 acr e facultativ e sludg e lagoon s (abou t 24,400,00 0 total gallons) , Solid s ar e store di n th e lagoon s for a n averag e o f

thre e year s prio r

t o removal . Solid s ar e dredge dfro mth e lagoo n an deither drie di n sludg e dryin g bed s andlandapplie da s asolid , o r applie ddirectl y t o th e popla r tre e reus e systema s aliquid . Soli dapplicatio n i s b y spreader truc k or manur e spreade r

whil e liqui dapplicatio n i s by a PAG E 4

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t self-retrievin g hos e ree l or tracto r pulle dliqui dfieldspreaders . Biosolid s coul dals o b e landapplie ddirectl y fro mth e digester s or , potentially , a s Clas s A biosolid s afte r composting , Th e biosolid s ar e beneficiall y landapplie dt o th e 8 8 acre popla r plantation . Th e Cit

y monitor s volatil e solid s reductio n t o demonstrat e complianc e wit h federa l vecto r attractio n requirement s an dfeca l colifor m monitorin g t o demonstrat e complianc e wit h federa l pathoge n reductio n requirements . Th e Cit y produce s approximatel y 90 0 metri c di y ton s o f biosolid s per

year . Biosolid s application s generall y occu r durin g th e summer . Th e landapplicatio n site s hav e been approve db y th e Department . Th e Cit y ma y continu e to utiliz e th e previousl y authorize dlandapplicatio n site , Th e curren t sit e i s locate d i n Mario n County , Any futur e landapplicatio n sit e mus t confor mt o th e sit e selectio n criteri ai n th e Biosolid s Managemen t

Pla n an dmus t

b e locate di

n Mario n an dClackama s Counties . Th e Cit y conduct s yearl y chemica l testin g o f remove dsludg e (se e Tabl e 1) . Testin g include s analyse s fo r nutrient s an d1 1 metals , Base don th e analyses , ther e ar e n o know n potentia l impact s fro mth e curren t lan dapplicatio n program .
Parameter Arseni c Cadmium Chromiu m Copper Lead Mercur y Tabl e

Mg/dry K g 6,2 6 <5, 0 26. 1 39. 9 12. 3 0.17 0 1 - Biosolid s Metal s Result s for Jul y 200 4 §503.1 3 Tabi c 3 Limi t 4 1 mg/kg 3 9 mg/k g N o limi t 150 0 mg/kg 30 0 mg/kg 1 7 mg/k g Paramete r

Molybdenum Nicke l Seleniu m Silver Zin c Mg/dry K g "' " <2. 5 21. 4 <0.5 0 3.1 6 14 4 §503.1 3 Tabl e 3 Limi t N o limi t 42 0 mg/kg 100 mg/kg N o limi t 280 0 mg/kg Inflo w an d Infiltratio n (I/I ) Th e plan t receive da

n averag e o f

1.7 6 MG D durin g th e las t tw o dr y season s whil e it

receive da

n averag e o f 2.8 8 MG D durin g th e las t tw o we t weathe r periods . Th e we t

perio daverag e flo w i s les s tha n tw o time s th e dr

y perio daverag e flow . Th e maximu mdail y flo w o f 8.7 3 MG D occurre di

n Marc h 2003 . Th e plan t experience s significan t

bu t no t extrem e level s o f

I/I , Collectio n syste moverflow s can resul t fro mcatastrophic failur e o f

th e treatmen t

plan t o r pump statio n o r hig h flow s du e t o stormevents . Accordin g t o th e rule s (OA R340-041-0009(6 ) an d(7)) , th e City i s prohibite dfromdischarging ra w sewag e durin g th e perio do f Novembe r

1 throug h May 21 , excep t durin g astor meven t greate r than th e one-in-five-year , 24-hou r duratio n storm . I

n addition , the y canno t discharg e ra w sewag e durin g th e perio do f Ma y 2 2 throug h Octobe r

31 , excep t

durin g astormeven t greate r tha n th e one-in-ten-year , 24-hou r duratio n storm . Th e Cit y o f Woodburn ca

n compl y wit

h thes e rules . Th e curren t

permi t contain s Carbonaceou s Biochemica l Oxyge n Deman d(CBOD s ) an dtotal suspende d solid s (TSS ) remova l efficienc y limit s o f 8 5 percent . Th e City ha s ha dn o violation s o f

th e removal efficienc y limits . Th e Departmen t i s proposin g t o retai n th e existin g limits . Industria l Pretreatmen t Th e Cit y o f Woodburn implement s a n industria l pretreatmen t progra moriginall y approve db y th e Departmen t

Marc h 26 , 1983 . Th e Stat e an dFedera l pretreatmen t requirement s wer e include din th e NPDE S permi t

fo r thi s facility whe n originall y issued . In th e calenda r year 2003 , th e Cit y permitte d6 significan t

industria l user s (SIUs) . Th e City currentl y ha s 1 categorica l industria l user ; 3 significan t industrial users , an d2 non-dischargin g categorica l industries . PAG E 5

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t
Th e cor e component s o f

th e City' s approve dpretreatmen t progra mar e curren t

wit h th e exceptio n o f

th e nee dt o re-evaluat e local limits . Revision s t o th e origina l approve dprograminclude : update s t o th e local limit s approve dby DE Q an dincorporate dinto th e NPDE S permi t by referenc e on Jun e 26 , 1995 ; modification s t o th e sewe r us e ordinanc e approve dby DE Q on Ma y 30 , 1996 , an dincorporate dinto th e NPDE S permi t

by referenc e o n Augus t

26 , 1996 ; revision s t o th e Enforcemen t Respons e Guid e approve d b y DE Q o n February 17 , 1999 , an dincorporate dint o th e permi t by referenc e o n Augus t

25 , 1999 ; and , change s t o th e pretreatmen t implementatio n procedure s approve dby DE Q an dincorporate dint o th e NPDE S permi t

b y referenc e o n February 17 , 1999 . Th e Cit y performe datechnica l evaluatio n o f th e nee dt o re-evaluat e loca l limit s a s par

t o f th e NPDE S renewa l process . It

wa s determine dtha t

alocal limit s stud y i s appropriat e t o furthe r quantif y headwork s loadings , remova l efficiencies , an dloca l limit s base do n th e recen t

improvement s t o th e treatmen t processes . Th e local limit s stud y i s currentl y i n progress . Th e technicall y base drevise dlocal limit s ar e expecte dt o b e complet e by 2006 . Additionally , th e Cit y i s implementin g amanagemen t plan t o reduc e mercur y an dsilve r

fromth e raw sewag e enterin g th e wastewate r treatmen t

plan t whic h correspond s t o reduction s in th e amount s discharge dt o th e receivin g waters . Th e managemen t pla n wa s approve dby DE Q on Marc h 27 , 1997 , an di s bein g implemente do n a n ongoin g basis . Th e City o f

Woodburn' s industria l pretreatmen t programwa s nominate dfor aNationa l Pretreatmen t ProgramExcellenc e Awar dby DE Q an dth e USEP A Regio n 1 0 i n 2000 . Th e mos t

recen t federal-leve l pretreatmen t

programaudi t

wa s performe dby DE Q durin g Jun e 5-6 , 2001 . Th e findings o f th e audi t resulte din require dan drecommende daction s t o improv e th e progra mbu t n o violation s o f

th e NPDE S permi t Schedul e E Pretreatmen t Activitie s wer e documente d(i. e Notic e o f Noncompliance) . Th e require dan drecommende daction s identifie di n th e audi t

wer e resolve dt o th e satisfactio n o f th e Departmen t

i n aDE Q letter

date dJul y 1 1 , 200 1 , Groundwate rIssue s Th e treatmen t

plan t i s constructe dentirel y o f imperviou s structure s excep t for th e bentonit e line dstorag e lagoo n an dth e facultativ e sludg e lagoo n (FSL) . Th e storag e lagoo n i s use dfor storag e o f

fully treate d reclaime dwate r

i f th e reclaime dwate r

canno t b e applie da

t th e tim e i

t i s generated . Th e FS L ha s 4 0 mi l pol y liner . It

i s no t anticipate dtha t

th e treatmen t

proces s itsel f

o r th e discharg e t o surfac e water s wil l caus e groundwate r

impacts . Th e biosolid s an dreclaime dwate r application s ar e performe dat agronomi c rate s or

less . Becaus e the y ar e applie da

t agronomi c rate s o r

less , th e Department' s groundwate r protectio n requirement s ar e satisfied . Prio r t o th e curren t

permit , th e City performe dgroundwate r monitorin g fo

r leve l an dnitrat e du e t o th e potentia l groundwate r

impact s fromth e lagoon . N o significan t impact s t o groundwate r

wer e note ddu e t o th e facility althoug h som e upgradien t (background) nitrat e level s wer e elevated . Schedul e A o f

th e propose dpermi t

prohibit s advers e impact s to groundwater , A conditio n i n Schedul e D state s tha t n o groundwate r

evaluation s wil l b e require ddurin g thi s permi t cycle , Stormwate rIssue s General NPDE S permit s fo r stormwate r

ar e require dfo

r facilitie s wit

h adesig n flo w o f

greate r tha n 1 MG D i f stormwate r

i s collecte dan ddischarg e fromth e plant site . Thi s facilit

y ha s been assigne daseparat e 1200
- Z permi t that regulate s th e discharg e o f stormwater . Stormwater

i s not addresse di

n thi s permit . PAG E 6Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Outfall s Th e curren t

NPDE S Permi t

allow s th e treatmen t

facilit y t o discharg e treate deffluent into th e Puddin g Rive r southeas t o f th e plan t throug h tw o outfal l pipe s a t River Mil e 21.5 . Al l flo w discharge s throug h Outfal l 001 A excep t

when discharg e flow s a

t th e facilit y excee dabou t

1 2 MGD . At

that point , treate dwastewate r overflow s a

n interna l wei r an dbegin s t o discharg e fro mbot h outfalls . Al l effluent

monitorin g occur s prio r t o th e interna

l weir . Th e Department' s GI S tool identifie s th e discharg e locatio n fo r Outfal l 001 A an dOutfal l 0 0 I B a s Rive r Mil e 21.4 . Th e renewal permi t wil l includ e arive

r mil e o f 21. 4 fo r bot h outfalls . Outfal l 001 A i s locate dat approximatel y Latitud e 45 ° 9.053 ' North , Longitud e 122 ° 48,23 2 West . Outfal l 001 B i s locate dat ' approximatel y Latitud e 45 ° 9.071 ' North , Longitud e 122 ° 48.18 2 West . Treated , disinfecte dan d dechlorinate deffluent

i s discharge dthroug h Outfall s 001 A and00I B i n accordanc e wit

h th e limit s in Schedul e A , Conditio n La . Outfal l 00I B ma y not b e usedunti l th e capacity o f Outfal l 001 A ha s bee n reached . Th e curren t

NPDE S Permi t

allow s th e treatmen t

facilit y t o lan dappl y treate dan ddisinfecte dreclaime d wate r to th e 8 8 acr e popla

r plantation . Th e plantatio n wil l b e expande di n th e futur

e a s needed . Leve l H

I reclaime dwater

i s landapplie dthroug h Outfal l 002 . Th e plantatio n i s locate dat th e wastewate r

treatmen t facilit y at approximatel y Latitud e 45 ° 9.255 ' North , Longitud e 122 ° 48,41 8 West . Irrigatio n mus t b e in accordanc e wit

h th e limit s i

n Schedul e A , Conditio n 1 .b . Th e existin g Penni t

identifie s thre e emergenc y overflo w point s a t pump stations . Th e propose dpermi t identifie s th e sam e thre e emergenc y overflo w points , Lif t Statio n # 2 a t

Janse n Wa

y ha s bee n replace d with th e Vanderbec k

Lif t Statio n bu t

th e overflo w poin t

remain s th e sam e (Outfal l 003) . After filling th e we t well , th e syste mwil l overflo w t o a n unname dswal e a

t approximatel y Latitud e 45 ° 9.654 ' North , Longitud e 122 ° 51.74 4 West . Lif t Statio n # 6 (Outfal l 004 ) overflow s t o a n unname dswal e i

n afieldnear 45 ° 8.44 ' North , Longitud e 122 ° 52.3 6 West . Th e Mil l Cree k Pump Statio n (Outfal l 005 ) overflow s directl y t o Mil l Cree k

a t approximatel y Latitud e 45 ° 9,107 ' North , Longitud e 122 ° 50.77 6 West . Discharge s fro

mthes e overflo w point s ar e prohibite dexcep t i n accordanc e wit

h th e Orego n Administrativ e Rule s (OAR) . Mixin g Zon e Analysi s Federa l regulation s (4 0 CFR131.13 ) allo w for th e us e o f

mixin g zones , als o know n a s "allocate dimpac t zones" . Whe n usin g mixin g zone s acut e toxicity t o driftin g organism s mus t b e prevente dan dth e integrity o f

th e waterbod y a s awhol e ma y no t b e impaired . Mixin g zone s allo w th e initial mixin g o f wast e an dreceivin g water , bu t ar e no t designe dt o allo w for

treatment , EP

A doe s no t

hav e specifi c regulation s pertainin g t o mixin g zones . Eac h stat e mus t adop t it s ow n mixin g zon e regulation s tha t ar e subjec t t o revie w an dapprova l by EPA , I n State s tha t

lac k approve dmixin g zon e regulations , ambien t wate r quality standard s mus t

b e me t at th e en do f

th e pipe . Th e Departmen t

ha s adopte dth e two-numbe r aquati c lif

e criteri aan ddevelope dmixin g zon e regulation s with respec t

t o that , Th e regulation s ar e primaril y narrativ e an dessentiall y requir e th e permi t write r t o us e bes t professional judgmen t

i n establishin g th e siz e o f th e mixin g zone . Base don EP A guidanc e an d th e Department' s mixin g zon e regulations , tw o mixin g zone s may b e develope dfor eac h discharg e tha t reflec t acut e an dchronic effects : 1 ) Th e acut e mixin g zone , als o know n a s th e "zon e o f initial dilution " (ZID), an d2 ) th e chroni c mixin g zone , usuall y referre dt o a s "th e mixin g zone" . Th e acut e mixin g zon e i s designe dt o preven t

lethality t o organism s passin g throug h th e ZID . Th e chroni c mixin g zon e i s designe dt o protec t

th e integrity o f

th e entir e wate r

bod y a s awhole . Th e allowabl e siz e o f th e mixin g zon e shoul db e base dupo n th e relativ e siz e o f th e discharg e t o th e receivin g stream , th e beneficial use s o f th e receivin g stream , locatio n o f othe r discharge s t o th e sam e wate r body , locatio n o f

drinkin g wate r PAG E 7

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t intakes , an dothe r

considerations . Mor e specifi c guidanc e i s availabl e fromEPA regardin g criteri ause d i n appropriatel y sizin g aZID . Primarily , th e ZI D mus t b e designe dto preven t lethality t o driftin g organisms . Th e Department' s mixin g zon e regulation s stat e th e mixin g zon e mus t b e les s than th e total streamwidt h a s necessary t o allo w passag e offis h an dothe r aquati c organisms . Earl y recommendation s regardin g th e siz e o f th e zon e o f

passag e originate dfro

mth e Departmen t

o f Interio r (1968) . The y recommende da zon e o f passag e o f

7 5 percen t

o f th e cross-sectiona l are aand/o r volum e o f

flo w o f th e receivin g stream . Base do n thi s recommendation , th e Department' s standar dpractic e i s t o allo w n o mor e than 2 5 percen t o f

, th e streamflow for

mixin g zones . Th e curren t

permi t provide s fo r

amixin g zon e that

consist s o f

that portio n o f

th e Puddin g Rive r extendin g fromapoin t

te n (10 ) feet

upstreamo f

Outfal l 001 A t o apoin t thre e hundre d(300 ) feet downstreamfromth e outfall . Th e Zon e o f Immediat e Dilutio n (ZID ) shal l b e define da s tha t portio n o f th e allowabl e mixin g zon e tha t i s withi n thirty (30 ) feet

o f th e poin t o f discharge . I

t i s likel y th e effluen t mixe s wit h mor e than 25 % o f

th e strea mflow prio r

t o 30 0 fee t

downstream . Th e propose dpermi t reduce s th e siz e o f

th e mixin g zon e an di s describe da s follows : Th e allowabl e mixin g zone s for outfall s 001 A an d00I B limi t th e lateral exten t

t o te n fee t

upstreaman d 20 0 fee t downstreamfro meac h respectiv e outfal l an drestrictin g th e dilutio n t o n o mor e than 2 5 percen t o f th e streamflow . Th e zon e o f initial dilutio n i s limite dt o tha t portio n o f

th e mixin g zon e that

i s withi n twenty feet

o f eac h outfall . A t th e critica l cas e lo w flo w (7Q1 0 streamflo w an ddischarg e at th e desig n flo w o f

5.03 7 MGD) , th e dilutio n achieve dwithi n th e ZI D an dmixin g zon e define dabov e i s 1.2 a t th e edg e o f

th e ZI D an d1. 6 a t th e edg e o f

th e mixin g zone . Thi s dilutio n i s base do n th e discharg e o f

outfal l 001 A onl y becaus e outfal l 001 B i s onl y operationa l unde r extremel y hig h flow event s (bot h plan t an driver flows) . Receivin g Strea m Wate rQualit y Th e City' s discharg e i s t o th e Puddin g River a t Rive r Mil e 21.4 , Th e discharg e i s withi n th e Willamett e basi n an dMolalla-Puddin g sub-basin . Th e designate dbeneficial use s o f th e receivin g streamare : publi c an dprivat e domesti c wate r supply , industria l wate r

supply , irrigation , livestoc k watering , fis h an daquati c lif e (includin g salmoni drearin g an dpassage) , wildlif e an dhunting , fishing, boating , wate r contac t recreation , aestheti c quality an dhydr o Power . Th e wate r quality standard s fo

r th e Willamett e Basi n (OAR340-041 ) wer e develope dt o protec t th e beneficial use s o f

th e basin . Th e Puddin g Rive r

i s include do n th e Department' s 200 2 Lis t o f Wate r Qualit y Limite dWate r

Bodie s (als o calle dth e 303(d ) List ) a s wate r quality limite dfo

r temperatur e i

n th e summer , feca

l bacteri ayear roun dan dDD T year-round , A Tota l Maximu mDail y Load(TMDL ) addressin g thes e parameter s shoul d b e issue ddurin g 2006 . Th e TMD L ma y assig n Wast e LoadAllocation s (WLA) t o thi s source , Th e WL A ma y b e incorporate dint o th e permi t b y modificatio n o r

durin g th e nex t

permi t renewal , Previously , th e dissolve doxyge n standar dwa s violate di n th e Puddin g Rive r

fromJun e throug h Octobe r mos t years . Th e dissolve doxyge n violation s were du e t o poin t sourc e discharge s an dnon-poin t sourc e contribution s o f

oxyge n demandin g pollutants . I n Augus t 1993 , th e Departmen t

establishe daTMD L t o brin g th e rive r

into complianc e with th e dissolve doxyge n standard , Th e TMD L contain s WL A for CBOD 5 , ammoni aan ddissolve doxyge n i n th e discharge deffluent

fromWoodburn' s treatmen t facility . I n January 1996 , th e Environmenta l Qualit y Commissio n (EQC ) adopte dne w dissolve doxyge n standards . Th e Departmen t recalculate dth e TMD L wast e loadallocations (usin g th e sam e model ) t o tak e int o accoun t

th e newl y approve dwate r quality standard s for

dissolve doxygen . I

n 1998 , th e revise d PAG E 8

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t WLA s wer e incorporate dint o Woodburn' s permit . Th e revise dWLA' s ar e flo w base d(both effluen t an d stream ) concentratio n limit s that provide dmor e operationa l flexibility t o th e City for spli t discharges , Temperature Issues Wate r temperatur e affect s th e biologica l cycle s o f aquati c specie s an di s acritica l facto r i n maintainin g an drestorin g health y salmoni dpopulation s throughou t th e state . I

t i s th e polic y o f

th e Environmental Quality Commissio n (EQC ) to protec t aquati c ecosystem s fro

madvers e temperatur e change s cause dby anthropogeni c activities . Th e purpos e o f th e temperatur e criteri aliste di n OA R340-041-002 8 i s t o protec t designate dbeneficia l use s that ar e temperatur e sensitive , includin g salmonid s in water s o f th e State . Th e Departmen t

utilize s Fis h Us e Designatio n an dSalmo n an dSteelhea dSpawnin g Us e Designation s map s t o identif

y applicabl e temperatur e criteri afo r eac h basin . Th e Willamett e Basi n map s ar e containe di

n OAR340-041 , Figure s 340 A an d340B , respectively . Accordin g t o th e newl y approve dus e designatio n maps , salmo n an dsteelhea dspawnin g i s designate da s salmo n an dtrou t rearin g an d migratio n habitat . Salmo n an dsteelhea dspawnin g i s no t adesignate duse . Therefore , th e applicabl e numeri c temperatur e criteri ai s 1 8 ° C durin g th e entir e year . Summer Period Th e Department' s Lis t

o f Wate r Qualit y Limite dWater

Bodie s (als o calle dth e 303(d ) List ) for 200 2 indicate s th e Puddin g Rive r i s wate r qualit y limite dfo

r temperatur e durin g th e summer . Pursuan t t o OAR340-0 4 l-0028(12)(b)(A) , prio r t o th e completio n o f

atemperatur e TMDL , eac h NPDE S poin t sourc e that

discharge s int o atemperatur e wate r quality limite dwate r

i s allowe da"Human Us e Allowance" . Eac h poin t sourc e ma

y caus e th e temperatur e o f th e wate r

bod y t o increas e u p t o 0. 3 degree s Celsiu s abov e th e applicabl e criteri aafter mixin g wit

h eithe r twent y fiv e (25 ) percen t o f th e streamflow , o r

at th e edg e o f

th e mixin g zone , whicheve r i s mor e restrictive . In Woodburn' s case , th e mixin g zon e i s limite dt o mixin g wit h 2 5 percen t

o f th e streamflo w s o bot

h criteri aabov e ar e equivalent . Allowin g for

mixin g wit

h 2 5 percen t

o f th e streamunder

7Q1 0 conditions , thi s discharg e ha s a reasonabl e potentia l t o violat e th e temperatur e standard(Se e attachmen t 4) . Therefore , a

n Exces s Therma l Load(ETL ) limi t mus t b e include di

n thi s permit . Th e propose dlimi ti s 9. 2 millio n kcal s pe r day a s aweekl y average . Th e City may no t

b e abl e t o consistentl y compl y wit h th e propose dexces s therma l loadlimit . Th e permi t include s aschedul e o f

improvement s th e permitte e mus t complet e a s necessar y t o compl y wit h th e temperatur e standard . Winter Period Th e Department' s Lis t

o f Wate r Quality Limite dWate r

Bodie s (als o calle dth e 303(d ) List ) for 200 2 indicate s th e Puddin g Rive r i s no t wate r quality limite dfo

r temperatur e durin g th e winter . I n orde r t o protec t col dwater , apoin t

sourc e ma

y no t increas e th e streamtemperatur e (a t th e poin t

o f maximu m impact ) by mor e tha

n 0. 5 degree s Celsiu s abov e th e ambien t temperatur e (OA R340-041-0028( 1 l)(b)) . Base do n th e existin g discharg e (existin g facility desig n flo w an dmaximu meffluen t temperatures) , th e Departmen t

calculate din-streamtemperatur e increase s base do n th e stream' s 7Q1 0 flo w (se e Attachmen t#3-4) , Becaus e th e in-streamtemperatur e increas e i s significantl y smalle r than th e allowabl e increase , thi s facility ha s n o reasonabl e potentia l t o violat e th e temperatur e standard . Therefore , a

n Exces s Therma l Loadlimi t ha s no t bee n include di

n thi s permit . Th e abov e summe r

perio dlimi t

i s considere dinteri man dth e permi t ma y b e reopene dan dth e thermal loadlimi t adjuste du p o r

dow n whe n mor e accurat e temperatur e o r dilutio n dat abecome s available . If PAG E 9

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t th e temperatur e TMD L fo r thi s sub-basi n assign s aWL A t o thi s source , thi s permi t ma y b e re-opene dt o establis h ne w therma l loadlimit s and/o r ne w temperatur e condition s o r requirements . Fecal Bacteria Issues A s stated , feca

l bacteria l level s excee dth e standar dyear-roun dbu t n o TMD L ha s been developed . Th e NPDE S Permi t

represent s th e Bacteri aContro l Managemen t Pla n for th e City o f

Woodburn . A s lon g a s th e discharg e remain s in complianc e with th e permit' s bacteri alimits , th e treate deffluen t discharg e wil l no t hav e anegativ e impac t on th e wate r

quality o f

th e Puddin g Rive r

wit h respec t t o bacteria . Th e sewag e collectio n syste m(includin g portion s no t owne dby th e City ) ha s experience dafew ra w sewag e overflow s durin g thi s permi t cycle . Thes e overflow s hav e contribute da n unknow n amoun t

t o th e violation s o f

th e feca l bacteri astandard . I f th e bacteri aTMD L for

thi s sub-basi n assign s aWL A t o thi s source , thi s permi t ma y b e re-opene dt o establis h ne w bacteri alimit s and/o r ne w bacteri acondition s o r requirements . DDT Issues Th e TMD L t o b e issue di n 200 6 wil l addres s thi s pollutan t bu t i t i s no t likel y thi s discharg e i s a significan t

sourc e o f

thes e pollutants . However , th e Departmen t ha s littl e informatio n concernin g th e discharg e o f

thes e pollutant s unde r

thi s permit . Therefore , th e propose dpenni t include s th e pesticid e fractio n in th e monitorin g requiremen t for priority pollutant s i

n Schedul e B . I

f th e TMD L for

toxi c pollutant s in thi s sub-basi n assign s aWL A t o thi s source , thi s permi t ma y b e re-opene dt o establis h ne w limit s o n toxi c pollutant s and/o r ne w toxi c pollutan t

condition s or

requirements . Th e Departmen t

i s no t awar e o f an y othe r

wate r quality violation s that

ma y b e attributabl e t o thi s source . A future TMD L wil l determin e th e correctiv e action s necessary t o brin g th e Puddin g Rive r bac k into compliance . Tha t

TMD L ma

y assig n on e o r

mor e pollutan t

WL A t o thi s poin t

sourc e discharge . Thi s permi t ma y b e reopene dt o incorporat e an y WLA . PERMI T HISTOR Y Previou s Permi tAction s NPDE S Permi t

#10155 8 wa s issue dby th e Departmen t o n Marc h 31 , 1998 , Th e Permi t wa s modifie do n Augus t 5 , 199 9 t o substitut e abette r descriptio n o f

th e Whol e Effluent

Toxicit y (WET ) testin g protocol. Th e Permi t

expire do

n Februar y 28 , 2003 , A renewal applicatio n wa s receive don Septembe r 6,200 2 an d th e permi t

shal l no t b e deeme dt o expir e unti l final actio n ha s been take n o n th e renewa l application . Th e Marc h 31 , 199 8 permi t establishe dCBOD 5 an dTS S concentratio n an dmas s limit s tha t var y betwee n summe r an dwinte r

seasons . Limit s wer e als o establishe dfo r CBOD 5 an dTS S removal efficiency , pH , E. coli bacteri aan dtota l chlorin e residual . Durin g th e TMD L perio d(Jun e throug h November) , ther e ar e dail y maximu mlimit s for CBOD 5 an dTS S concentration , dissolve doxyge n an dammonia . A mixin g zon e an dZon e o f

Immediat e Dilutio n (ZID ) wa s included , Tw o treate deffluent

outfall s (001 A an d00IB ) ar e identifie dalon g wit h tw o reclaime dwate r

outfall s (00 2 fo r Leve l III reuse) . Thre e emergenc y overflo w point s wer e identified . A n Antidegradatio n Revie w wa s complete dwit h arecommendatio n t o procee dwit h thi s permi t

actio n (se e Attachmen t#5) .
PAG E 10

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Existin g Permi tLimit s Schedul e A contain s th e effluen t limit s fo r th e treatmen t

facility . Som e limit s ar e dependen t upo n th e seaso n (summe r

an dwinter ) o r

mont h whil e other s ar e year-round . Th e existin g permi t limit s ar e a s follows : Outfal l 00 1 - Treate dEffluent (1 ) Ma y 1 - Paramete r CBOD 5 TS S Octobe r 3 1 : Averag e Effluent Concentration s Monthl y Weekl y 1 0 mg/ L 1 5 mg/

L 1 0 mg/ L 1 5 mg/

L Monthl y

Averag e lb/day 42 0 42 0 Weekl y

Averag e lb/day 63 0 63 0 Dail y

Maximu m lb s 83 0 83 0 (2 ) Novem t Paramete r CBOD 5 TS S >e r 1 - Apri l 30 : Averag e Effluent Concentration s Monthl y Weekl y 2 5 mg/ L 4 0 mg/

L 3 0 mg/ L 4 5 mg/

L Monthl y

Averag e lb/day 94 0 110 0 Weekl y

Averag e lb/day 140 0 1700 Dail y

Maximu m lb s 1900 220 0 (3 ) Othe r

Parameter s (year-round ) Parameter s E. coli Bacteri a p H
CBOD 5 an dTS S Remova l Efficienc y ; Limitation s Shal l no t excee d12 6 organism s pe r 100 m L monthl y geometri c mean . N o singl e sampl e shal l excee d40 6 organism s pe r

10 0 m L Shal l no t b e outsid e th e rang e o f

6. 0 - 9. 0 fo

r mor e than atotal o f

7 hour s an d2 6 minute s i n an y calendar month ; an dn o individua l excursio n fromthi s rang e shal l excee d6 0 minute s Shal l no t b e les s tha n 85 % monthl y average , (4 ) Othe r

Parameter s (Jun e 1 - Octobe r 31) : Parameter s CBOD 5 an dTS S Dissolve dOxyge n Ammonia- N Limitation s Shal l no t excee d2. 0 mg/ L dail y maximu m Shal l no t b e les s than 6. 5 mg/L a s adail y averag e Ther e ar e 9 0 separat e ammoni alimitatio n rangin g fro m 0, 1 mg/ L t o 1 0 mg/

L base do n month , effluen t flo w an d rive r flo w Schedul e A als o define s th e mixin g zone , prohibit s discharg e o f chlorine , include s requirement s an d limit s for th e beneficial reus e o f

Leve l (I I reclaime dwate r

an drestrict s discharge s fromth e emergenc y overflo w outfalls . Complianc e Histor y Thi s facilit

y wa s las t

inspecte dDecembe r

4 , 200 3 an dwa s foun dt o b e operatin g i n complianc e wit

h th e permit . Th e followin g Notice s o f Noncomplianc e (NON ) hav e bee n issue dfor violation s documente da t thi s facilit y durin g thi s permi t

cycle : PAG E I ICit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Dat e o f Enforcemen tActio n Novembe r

24 , 199 8 Septembe r

10 , 199 8 Typ e o f

Enforcemen tActio n Clas s 2 NO N Clas s 2 NO N Descriptio n o f Violatio n mwmMi$M$ Failur e to monito r

ammoni ao r

nutrient s Thre e Clas s 2 violation s an don e Clas s 3 violation s fo r exceedin g permi t

limit s NON' s ar e informal enforcemen t actions . Formal enforcemen t action s includ e Notic e o f Permi t Violatio n (NPV) , Civi l Penaltie s (CP ) an dadministrativ e orders . Th e City wa s issue daNP V o n February 17 , 199 9 fo r

th e permi t

violation s liste dabov e an dsom e tha t occurre ddurin g th e previou s permi t cycle . Th e City responde dt o th e NP V wit h a n appropriat e correctiv e actio n schedule . O n Octobe r

20 , 1992 , th e City wa s issue dStipulatio n an dFinal Orde r (SFO ) #WQMW-WVR-92-25 8 tha t establishe dapla

n an dschedul e fo

r comin g into complianc e wit h th e Wast e LoadAllocatio n (WLA ) establishe db y th e Puddin g Rive r Tota l Maximu mDail y Load(TMDL ) for dissolve doxygen . Th e SF O containe dinteri mdischarg e limitation s that th e facility coul dmeet unti l th e ne w facilitie s wer e completed . Th e SF O require dth e City t o b e i n complianc e wit

h th e TMD L establishe dfor th e Puddin g River

an dth e acut e an dchronic criteri afor toxi c substance s tw o month s after star t u p o f th e Phas e I nitrificatio n process . Th e SF O wa s terminate d6 0 day s after ful l complianc e wa s achieve di n 2001 , Th e abov e violatio n o r

violation s ar e considere dt o b e mino r and/o r hav e bee n corrected . Therefore , th e Departmen t

consider s thi s facility t o b e i n substantia l complianc e wit h th e term s o f

th e curren t

permit . Ther e i s n o recor do f

an y complaint s abou t

thi s facility . PERMI T LIMITATION S Tw o categorie s o f

effluen t limitation s exis t

fo r NPDE S permits : 1 ) Technolog y base deffluen t limits , an d 2 ) Wate r quality base deffluen t

limits . Technolog y base deffluent limit s hav e bee n establishe db y EP A rales. Technolog y base deffluen t limit s wer e establishe dt o requir e aminimu mleve l o f treatmen t

for industria l o r

municipa l source s usin g availabl e technology . Wate r quality base deffluen t

limit s ar e designe dt o b e protectiv e o f th e beneficial use s o f

th e receivin g wate r

an dar e independen t

o f th e availabl e treatmen t

technology , I n addition , whe n performin g apermi t renewal , ther e ar e existin g permi t limit s (discusse dabove) . Thes e ma y b e technology-base dlimits , wate r quality-base dlimits , o r limit s base don bes t

professiona l judgment . Whe n renewin g apermit , th e mos t stringen t o f technology-based , wate r quality-based , an d existin g effluent

limit s mus t

b e applied . Technology-Base d Effluen tLimit s EP A ha s establishe dsecondar y treatmen t standard s for

domesti c wastewate r

treatmen t

facilities . Th e standard s ar e foun din 4 0 CFRPart 133 . Thi s facilit

y mus t achiev e abiochemica l oxyge n deman d (BOD5 ) monthl y averag e o f 3 0 mg/ L an daweekl y averag e o f 4 5 mg/ L o r acarbonaceou s biochemica l oxyge n deman d(CBOD 5 ) monthl y averag e o f 2 5 mg/ L an daweekl y averag e o f 4 0 mg/L . Th e facilit

y mus t als o achiev e asuspende dsolid s (TSS ) monthl y averag e o f 3 0 mg/ L an daweekl y averag e o f 4 5 mg/L . Th e p H mus t

b e betwee n 6. 0 an d9,0 . I n addition , th e facility mus t remov e a t

leas t 85 % o f th e influent CBOD 5 an dTSS , PAG E 1 2

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Orego n Administrativ e Rule s establis h minimu mdesig n criteri afor domesti c treatmen t

facilities . I

n th e Willamett e Basin , th e CBOD 5 an dTS S minimu mdesig n criteri ai s 1 0 mg/L a s amonthl y averag e i n th e summe r perio dan dsecondar y treatmen t i n th e winte r

period . I

n addition , ther e ar e requirement s for disinfectio n an ddilutio n o f oxyge n demandin g pollutants . Wate rQuality-Base d Effluen tLimit s Pollutan t parameter s shoul db e limite di f ther e i s areasonabl e potentia l for th e discharg e t o caus e o r contribut e t o a

n excursio n abov e an y stat e wate r quality criteri ao r

standard . Th e futur

e TMDL s ma

y assig n additiona l WLA s t o thi s sourc e t o addres s in-strea mviolation s o f

wate r quality criteria . Th e Departmen t

i s require dt o determin e whethe r th e discharg e ha s th e reasonabl e potentia l t o caus e o r contribut e t o a

n exceedanc e o f

awate r quality criterion . EP

A ha s develope dametho dt o make thi s determinatio n for

toxi c pollutant s calle dareasonabl e potentia l analysi s (RPA) . An RP A relie s o n statistica l probabilit y t o determin e th e likelihoo dthat adischarg e wil l violat e a n instreamcriterio n base d o n th e effluent

data , it s variability , availabl e dilution , an dth e receivin g wate r backgroun dconcentration . Th e Departmen t

ha s develope dRPA spreadsheet s tha t emplo y EPA' s methodology . N o RPA for

chlorin e wa s performe ddurin g thi s evaluation . N o chlorin e i s use dfo r disinfectio n o f wastewate r

that i s discharge dfro mOutfall s 001 A o r 00IB . Ammoni adurin g th e summe r TMD L perio d wa s extensivel y evaluate ddurin g th e 199 8 permi t actio n an di

t wa s determine dthat

th e allowabl e ammoni adischarg e base do n maintenanc e o f instreamdissolve doxyge n wa s mor e stringen t than th e maximum s base don toxicit y fo r eac h flo w scenari o an dseason . A n ammoni aRP

A wa s performe dfor

th e non-TMD L perio d(se e Attachmen t #6a ) fo r thi s permi t action . Th e prio r

permi t evaluatio n report

assume dth e non-TMD L perio dammoni aconcentration s woul db e consistentl y belo w 1 0 mg/L . However , o f th e 9 4 ammoni aresult s evaluate db y th e Department , th e highes t

concentratio n wa s 2 2 mg/L , Th e RPA indicate s thi s sourc e ha s areasonabl e potentia l t o caus e a n excursio n abov e th e stat e wate r quality criteria . A s aresult , th e Departmen t i s proposin g t o includ e ammoni alimit s fo r th e non-TMD L perio di

n th e renewal permi t A RPA for

cyanide , metal s an dtoxi c organic s wa s performe db y evaluatin g effluen t dat ai n th e DE Q spreadsheets . N o organi c compound s (includin g tota l phenols ) wer e detecte di n th e priority pollutan t scans . O f th e metal pollutant s an dcyanide , th e RPA (se e Attachmen t#6b ) indicate dtha t concentration s o f copper , cyanide , lead , mercury , silve r an dzin c i

n th e effluent

coul dhav e areasonabl e potentia l t o caus e a n excursio n abov e th e stat e wate r qualit y criteria . Primarily , thi s wa s cause db y th e smal l numbe r o f in-streamtest s performe db y th e Departmen t an dth e detectio n level s o f

thos e tests . I

n mos t eases , th e effluent

concentratio n wa s nea

r o r eve n belo w th e minimu mdetectio n leve l for that parameter . I

n addition , th e upstreambackgroun dconcentration s wer e actuall y abov e th e wate r qualit y criteri afo

r several parameter s (an dwer e ofte n base do n th e detectio n limi t fo r tha t parameter) . Th e Departmen t

propose s t o includ e permi t requirement s for

specia l monitorin g o f

th e effluent

an d receivin g streamusin g a"clean " samplin g method , a n "ultra-clean " samplin g method , EP A metho d166 9 o r an y othe r

metho dapprove db y th e Department . Monitorin g for mercur y shal l b e conducte di n accordanc e wit

h EPA Metho d1631 . Th e specia l monitorin g mus t b e conducte don th e effluent semi
annuall y for

a t leas t tw o years . After

2 years , th e permitte e ma y discontinu e specia l monitorin g o f th e effluent unles s otherwis e notifie di n writin g b y th e Department , Th e specia l monitorin g o f th e receivin g strea mmus t

b e conducte dsemi-annuall y durin g 2005 , PAG E 1 3

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t After specia l monitorin g i s complete , th e Departmen t wil l perfor

mane w RP A t o determin e i f th e discharg e ha s apotentia l to caus e o r contribut e t o a

n excursio n abov e th e stat e wate r quality criteria . I f ther e i s areasonabl e potential , th e Departmen t ma y modif y th e permi t

a s necessary . PERMI T DRAF T DISCUSSIO N Th e propose dpermi t

limit s an dcondition s ar e describe dbelow . Refer t o th e propose dpermi t

an dth e discussio n abov e whe n reviewin g thi s section . Fac e Pag e Th e fac e pag e provide s informatio n abou t th e permittee , descriptio n o f th e wastewater , outfal l locations , receivin g streaminformation , permi t approva l authority , an dadescriptio n o f permitte dactivities, Th e permitte e i s authorize dt o construct , install , modify , or operat e awastewate r

collection , treatment , contro l an ddisposa l system . Permit s discharg e o f treate deffluen t

t o th e Puddin g Rive r

withi n limit s se t

b y Schedul e A an dth e followin g schedules . Al l othe r discharge s ar e prohibited . I n accordanc e wit

h OA R340 , Divisio n 4 9 al l permitte dmunicipa l wastewate r collectio n an dtreatmen t facilitie s ar e t o receive aclassificatio n base don th e siz e andcomplexit y o f th e systems . Th e Departmen t ha s incorporate dth e classificatio n o f th e collectio n an dtreatmen t system s into th e NPDE S discharg e permit . Th e treatmen t

syste mi s considere daClas s I V syste mwhil e th e collectio n syste mi s considere d Clas s III . Bot

h system s wer e reevaluate dt o determin e th e appropriatenes s o f th e curren t

classificatio n for operato r certificatio n requirement s (se e Attachmen t#7) , N o change s ar e propose dt o th e syste m classifications . Schedul e A , Wast e Discharg e limitation s Schedul e A contain s th e effluen t limitation s propose dfor Outfal l 001 . I

n addition , ther e ar e condition s prohibitin g raw sewag e overflows, th e us e o f chlorin e fo

r disinfectio n purpose s an dadvers e impact s o n existin g o r

potentia l beneficia l use s o f groundwater . Outfall s 001 A an d00I B - Treate dEffluent Th e Departmen t

i s generall y proposin g t o retai n th e existin g limit s show n abov e wit h afe w exceptions . Th e p H limi t

wil l becom e slightl y mor e restrictiv e an dth e numbe r o f differen t ammoni alimit s durin g th e TMD L perio dwil l b e reduced . I n addition , tw o ne w limit s ar e bein g proposed . Th e ne w limitation s wil l regulat e th e discharg e o f therma l loadbetwee n Ma y I an dOctobe r

3 1 an dth e discharg e o f ammoni a betwee n Novembe r

1 an dMay 3 1 eac h year . CBOD 5and

TSS concentration and

mass limits N o change s ar e bein g propose dt o th e existin g limits . Belo w i s adescriptio n o f ho w the y wer e calculate d previously . Base don th e Willamett e Basi n minimumdesig n criteria , wastewate r treatmen t

resultin g in a monthl y averag e effluent concentratio n o f

1 0 mg/ L fo r Carbonaceou s Biochemica l Oxyge n Deman d (CBOD 5 ) an dTS S mus t

b e provide dfro

mMa y 1 throug h Octobe r

31 , Fro mNovembe r

1 throug h Apri l 30 , aminimu mo f

secondary treatmen t

i s required . Secondary treatmen t i n Orego n i s define da s a monthl y averag e concentratio n limi t o f 3 0 mg/ L fo r BOD 5 o r 2 5 mg/ L fo r CBOD 5 and3 0 mg/

L for TSS , Th e Cit y i s requestin g t o maintai n it s concentratio n an dmas s limit s base do n CBOD 5 year-round . Th e Departmen t

i s proposin g concentratio n limit s at leas t a s stringen t

a s th e basi n minimu mdesig n criteria . Th e propose dmonthl y averag e summe r CBOD 5 an dTS S concentratio n limit s ar e 1 0 mg/ L wit h aweekl y averag e limi t

o f 1 5 mg/L . Durin g th e TMD L perio d(Jun e 1 throug h Octobe r 31) , th e facilit

y i s als o require dt o compl y wit

h CBOD 5 an dTS S dail y maximu mlimit s o f 2 0 mg/L . Th e propose dmonthl y averag e winte r

CBOD 5 concentratio n limit s ar e 2 5 mg/ L wit h aweekl y averag e limi t o f 4 0 mg/L . Th e PAG E 1 4Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t propose dmonthl y averag e winte r TS S concentratio n limit s ar e 3 0 mg/ L wit h aweekl y averag e limi t o f 4 5 mg/L . In accordanc e wit

h OA R340-041-006 1 (10)(b) , th e monthl y an dweekl y averag e an ddail y maximu m mas s loadlimit s for

CBOD 5 an dTS S fo

r ne w facilitie s shoul db e calculate don th e estimate dcapability o f th e treatmen t

plant . Unde r

thi s rule , th e summe r

mas s loa dlimit s for

ane w facility woul db e base don th e 2 year

recurrenc e hig h summe r flo w an dth e capability o f th e facility t o trea t

th e wastewate r

at that flow. Th e 2 yea r

recurrenc e hig h summe r flo w wa s no t

determine dbu t

th e desig n ADW Fi s 5.03 7 MGD . Th e 2 year

recurrenc e hig h summe r flow woul db e somewhat highe r an dth e facility coul dconsistentl y produc e effluent

wit h 1 0 mg/ l o f CBOD 5 an dTS S at

thos e flows . However , thi s woul dresul t i n discharg e limit s that

woul db e highe r

tha n assigne dwast e loadallocatio n base don 5, 0 MGD . Thi s coul dresul t i n potentia l instreamviolation s o f dissolve doxyge n (at

some flo w scenario s an dparticularly toward s th e en do f th e desig n lif

e o f th e facility) . Therefore , th e mas s load s ma y no t excee dth e WLA' s assigne dby th e TMDL . Th e facility' s propose dsumme r mas s limit s (monthl y an dweekl y averag e an ddail y maximum ) fo r CBOD s an dTS S ar e base do n th e wast e loa dallocatio n flo w o f

5. 0 MG D an dth e monthl y averag e CBOD j an dTS S concentratio n limi t o f 1 0 mg/L , Th e mas s loadlimitation s ar e rounde dt o tw o significan t

figures . N o change s ar e propose dfo r th e summe r

mas s limits . Th e summe r calculation s are : a ) 5, 0 MG D x 8.3 4 lbs/gal x 1 0 mg/ L = 41 7 (420 ) lbs/day monthl y avg . b ) 41 7 lbs/day monthl y av g x 1. 5 = 625. 5 (630 ) lbs/day weekl y avg . c ) 41 7 lbs/day monthl y av g x 2 = 83 4 (830 ) lb s dail y maximu m Th e winte r

monthl y an dweekl y averag e an ddail y maximu mmas s loadlimit s fo r CBOD s an dTS S calculate di

n accordanc e wit

h OA R340-04 1 -006 1 (10)(b ) woul dals o b e base don th e estimate dcapability o f th e treatmen t

plant . Th e winte r

perio dmas s loa

dlimit s coul db e base do n th e desig n maximu mmont h we t weathe r flo w o f 8.7 7 MG D an d2 5 mg/

L an d3 0 mg/

L fo r CBOD 5 an dTSS , respectively . Th e City chos e no t t o reques t

amas s loadincreas e fo

r winte r mas s load s durin g th e las t permi t issuance . Th e City reserve s th e righ t

t o petitio n th e EQ C for

a n increas e i

n accordanc e wit

h OA R340-041-0004(9 ) a t som e tim e i n th e future . Fo r thi s permi t

renewal , th e Departmen t i s proposin g t o retai n th e wintertim e mas s loadlimit s base do n th e desig n AWW Fo f

th e previou s RB C facility . Th e propose dwinte r mas s loadlimit s (monthl y an d weekl y averag e an ddail y maximum ) fo r CBOD 5 an dTS S hav e been base don 4. 5 MG D an dth e monthl y averag e concentratio n limit s o f 2 5 mg/ L an d3 0 mg/

L fo r CBOD 5 an dTSS , respectively . Th e mas s load limitation s ar e rounde dt o tw o significan t figures . N o change s ar e propose dfor th e winte r

mas s limits . Th e winte r

calculation s for

CBOD s are : a ) 4. 5 MG D x 8.3 4 lbs/gal x 2 5 mg/ L = 93 8 (940 ) lbs/day monthl y avg . b ) 94 0 lbs/day monthl y av g x 1.5 = 141 0 (1400 ) lbs/day weekl y avg . c ) 94 0 lbs/day monthl y av g x 2 = 188 0 (1900 ) lb s dail y maximu m Th e winte r

calculation s for

TS S are : a ) 4. 5 MG D x 8.3 4 lbs/gal x 3 0 mg/ L = 112 6 (1100 ) lbs/day monthl y avg . b ) 110 0 lbs/day monthl y av g x 1.5 = 165 0 (1700 ) lbs/da y weekl y avg . c ) 1100 lbs/day monthl y av g x 2 = 220 0 lb s dail y maximu m I n accordanc e with OA R340-006110(a)(C) , th e dail y mas s loadlimi t i s suspende don any da

y i n whic h th e flo w t o th e treatmen t facility exceed s 6.6 6 MG D (twic e th e desig n averag e dr y weathe r flow o f th e PAG E 1 5

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Phas e I facilities) , A revie w o f monitorin g dat a(se e Attachmen t#8 ) for th e las t tw o year s indicat e th e City i s generall y abl e t o compl y wit h th e permi t

limits . CBOD 5and

TSS Percent Removal Efficiency A minimu mleve l o f

percen t remova l for

CBOD 5 an dTS S for

municipa l discharger s i s require dby th e Cod e o f Federal Regulation s (CFR ) secondar y treatmen t standard s (4 0 CFR , Par t 133) . A n 8 5 percen t remova l efficienc y limi t

i s include di

n th e propose dpermi t

t o compl y wit

h federal requirements , A revie w o f monitorin g dat aindicate s th e City shoul dgenerall y b e abl e t o compl y wit h th e CBOD 5 an d TS S remova l efficienc y limits , pH Th e curren t

effluent limit s fo r p H ar e 6. 0 t o 9, 0 for

th e facility . Thi s limi t

i s i n accordanc e wit

h Federal wastewate r

treatmen t

guideline s for

sewag e treatmen t

facilitie s (i n 4 0 CF R133.102(c) ) an di s applie dt o th e majorit

y o f NPDE S permittee' s i

n th e state . Th e Willamett e Basi n wate r qualit y standard s for

p H ar e establishe di

n OAR340-041-0345 . Th e allowe dambien t rang e i s 6. 5 t o 8,5 . Withi n th e permittee' s mixin g zone , th e wate r

qualit y standar dfo

r p H doe s no t

hav e t o b e met . Previously , th e Departmen t believe dthat

mixin g with ambien t

wate r withi n th e mixin g zon e woul densur e tha t th e p H at

th e edg e o f th e mixin g zon e me t

th e standar d However , th e Departmen t use dane w spreadshee t

t o evaluat e th e p H o f

th e effluen t

mixe dwit

h ambien t wate r withi n th e mixin g zon e (se e Attachmen t#9) . Usin g 90' 1 ' percentil e hig h an dlo w streamp H an d th e dilutio n achieve dwithi n th e mixin g zone , i t wa s determine dtha t

alowe r p H limi t o f 6. 0 woul dno t

b e protectiv e o f

th e wate r

quality standard . Therefore , th e Departmen t i s proposin g ne w p H limit s i n thi s permi t action . Th e propose dlimit s ar e 6. 5 t o 9.0 , Monitorin g for

pH i s continuous . When continuou s monitorin g i s provided , th e permi t allow s th e discharg e t o b e outsid e th e allowe drang e fo r u p to 1 percen t

( 7 hour s an d2 6 minutes ) o f any calendar month . N o singl e excursio n ma y las t longe r than on e hour . Th e Departmen t consider s th e propose d permi t limit s t o b e protectiv e o f th e wate r qualit y standard . Fecal Bacteria Th e curren t

permi t contain s limit s o n E. coli ar e base do n th e bacteri astandar dapprove din January 1996 . Th e limit s ar e amonthl y geometri c mea n o f 12 6 E. coli pe r

10 0 mL , wit

h n o singl e sampl e exceedin g 40 6 E. coli pe r 10 0 mL . Th e ne w bacteri astandar dallow s that if asingl e sampl e exceed s 40 6 E. coli pe r

100 mL , the n th e permitte e ma y tak e fiv e consecutiv e re-samples . If th e lo g mea

n o f th e five re-sample s i s les s tha n o r equa l t o 126 , aviolatio n i s no t triggered . Th e ne w rul e state s that th e re sample s shoul db e take n at four hou r interval s beginnin g a s soo n a s practicabl e (preferabl y withi n 2 8 hours ) after

th e origina l sampl e wa s taken . N o change s ar e propose dt o th e E. coli permi t limits . Th e E. coli effluen t limitation s ar e achievabl e throug h prope r

operatio n an dmaintenance . Dissolved Oxygen Th e Puddin g Rive r

TMD L assigne dCBOD 5 an dammoni aWLA' s base dupo n aminimu meffluent dissolve doxyge n concentratio n o f 6. 5 mg/l , Th e prio r

permi t include daminimu meffluent concentratio n limi t for dissolve doxyge n o f

6. 5 mg/ L fromJun e 1 throug h Octobe r 3 1 eac h year , Th e renewal permi t propose s t o continu e thi s limit , Excess Thermal

Load A s discusse dabove , thi s facility ha s areasonabl e potential t o violat e th e temperatur e standar ddurin g th e summer period . Th e calculate din-streamtemperatur e increas e ha s areasonabl e potentia l t o excee dth e "Human Us e Allowance " usin g dilutio n achieve di n th e mixin g zone . Therefore , a n Exces s Therma l PAG E 1 6

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Loa d(ETL ) limi t

mus t b e include di

n thi s permit . Th e formul afor calculatin g th e ET L limi t i s a s follows : ETL = 3.7%541Q e SATC p p Where : 3,7854 1 = flo w conversio n fromMGD t o m'Vda y Q e = effluen t

flo w i n MG D S = dilutio n i

n mixin g zon e A T = allowabl e temperatur e increas e i n ° C C p = specifi c hea t

o f wate r ( 1 cal/ g °C ) p = densit y o f

wate r ( 1 g/cm" ) Therefore , th e limi t

is ; ET L = (3.78541)(5. 0 MGD)(1,62)(0.3°C)(1.0cal/g o C)(l,0g/cm 3 ) = 9. 2 Millio n Kcals/da y Th e limi t i s applie da s aweekl y averag e fro mMa y 1 throug h Octobe r

3 1 eac h year . Th e ET L limi t i s considere dinteri man dth e permi t ma y b e reopene dandth e therma l loa dlimi t adjuste du

p o r dow n whe n mor e accurat e temperatur e o r dilutio n dat abecome s available . I f th e Tota l Maximu mDail y Loa d (TMDL ) fo

r temperatur e for

thi s sub-basi n assign s aWast e Loa dAllocatio n (WLA ) t o thi s source , thi s permi t ma y b e re-opene dt o establis h ne w therma l loa dlimit s and/o r

ne w temperatur e condition s o r requirements . Th e permitte e ma

y o r ma y no t currentl y hav e th e ability t o compl y with th e exces s therma l loadlimit . Therefore , th e Departmen t i s proposin g t o includ e aschedul e o f complianc e i

n Schedul e C o f

thi s permit , Th e Cit y wil l hav e t o compl y wit h th e ne w limi t

by n o later

Octobe r 31 , 2009 . Th e Exces s Therma l Loadlimi t ma y b e adjuste di

f th e Permitte e choose s riparia n improvement s a s a portio n o f thei r therma l reductio n program . Ammonia Ammoni ai s asubstanc e normall y foun di n wastewater , Th e wastewate r treatmen t

processes , particularl y aeratio n an dbiologica l treatment , ca n convert alarg e portio n t o nitrat e an dnitrit e bu t th e treate deffluen t stil l contain s som e ammonia . After discharge , th e continue dproces s o f oxidizin g th e ammoni aremove s dissolve doxyge n fro mth e ambien t water . A s part

o f th e Puddin g Rive r

Tota l Maximu mDail y Loa d (TMD L ammoni awast e loadallocation s (WLA ) were assigne dt o th e City for variou s plan t

an dstrea m flo w scenarios . Complianc e wit h th e WLA s shoul densur e complianc e wit h th e dissolv e oxyge n standards . Unionize dammoni ai s als o atoxi c agen t an dma y hav e t o b e limite dt o preven t toxicity . Th e wate r outsid e th e boundary o f

th e mixin g zon e mus t

b e fre e o f

material s i

n concentration s tha t

wil l caus e chronic (sublethal ) toxicit y whil e th e wate r outsid e th e ZI D mus t

b e fre e o f

pollutant s that

wil l caus e acut e toxicity . Th e 199 8 permi t

include dammoni alimit s base do n th e ammoni aWLAs . A tota l o f 9 0 separat e permi t limit s wer e develope dan dcompare dwit h calculate dlimit s base dtoxicity . I n eac h case , th e allowabl e ammoni adischarg e base don maintenanc e o f instreamdissolve doxyge n wa s mor e stringen t than th e maximum s base do

n toxicity . Th e Departmen t propose s t o retai n thes e limitation s excep t that th e limit s applicabl e t o plan t

flow s betwee n 3, 0 MGD an d3. 5 MG D hav e bee n eliminated , Whe n plan t flows ar e withi n tha

t range , th e facility wil l hav e t o compl y wit h th e mor e stringen t

limit s tha t

appl y whe n plan t PAG E 17

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t flow s ar e betwee n 3, 5 MG D an d4. 0 MGD . N o othe r change s ar e propose dt o th e ammoni alimit s durin g th e TMD L period , A t th e tim e o f

th e las t permi t issuance , i

t wa s assume dtha t

th e non-TMD L perio dammoni alevel s woul d b e consistentl y les s tha n 1 0 mg/L . Ninety-fou r effluent ammoni aconcentratio n result s fro mth e non TMD L perio dwer e reviewed . Th e highes t concentratio n foun dwa s 2 2 mg/L . Usin g th e critica l cas e streaman dPhas e I effluen t condition s an dth e estimate ddilutio n factor s for th e non-TMD L period , th e spreadshee t

(se e Attachmen t#6a ) calculate dtha t ther e wa s areasonabl e potentia l fo r chronic toxicity du e t o ammonia , Onc e strea mflow s excee d36 0 cfs , ther e i s n o reasonabl e potentia l for toxicit y an dn o permi t limi t i s neede d(se e Attachmen t#10) . Therefore , th e Departmen t i s proposin g t o includ e 3-tierec l effluen t ammoni alimit s fo

r th e non-TMD L perio di n thi s permi t

renewal . Usin g th e sam e critica l cas e strea man deffluen t condition s an destimate d dilutio n factors , ne w end-of-pip e limit s base don th e criteri awer e calculate d(se c Attachment s #ll a an d #llb) . Th e curren t

permi t doe s no t contai n alimi t

o n ammoni adurin g th e non-TMD L period . Th e wate r quality base dlimi t

i s th e mos t

restrictiv e permi t

limit . Th e Departmen t i s proposin g t o includ e th e followin g 3-tiere dwate r

qualit y base dlimit s i

n th e permi t

for th e perio do f

Novembe r

1 throug h Ma

y 3 1 eac h year : lEarairieter . •

" Ammonia- N (Novembe r

1 throug h Ma

y 3 1 whe n monthl y averag e strea mflo w i s les s than 20 0 cfs ) Ammonia- N (Novembe r

1 throug h May 3 1 whe n monthl y averag e strea mflo w i s equa l t o or greate r tha n 20 0 cf s bu t les s than 36 0 cfs ) Ammonia- N (November

1 throug h Ma

y 3 1 whe n monthl y averag e strea mflo w i s equa l t o o r greate r than 36 0 cfs ) Limitation s Shal l no t excee damonthl y averag e concentratio n o f 5. 7 mg/ L an dadail y maximu mconcentratio n o f 1 3 mg/ L (se e Not e 3 ) Shal l no t excee damonthl y averag e concentratio n o f 9. 6 mg/ L an dadail y maximu mconcentratio n o f 2 2 mg/ L (se e Not e 3 ) N o limitatio n
Th e ammoni acriteri acurrentl y in Tabl e 2 0 ar e base do n EPA' s Quality Criteri afo r Wate r (1986) , whic h i s als o know n a s th e "Gol dBook " criteria . Th e criteri afo r ammoni ai s bot

h p H an dtemperatur e dependant . Th e stat e o f

Orego n ha s adopte dth e newe r EP A 199 9 criteri afo

r ammonia . Th e EP

A 199 9 acut e criterio n i s als o p H dependan t an dth e chroni c criterio n i s bot h p H an dtemperatur e dependant , Effluent limitation s base don th e 199 9 criteri awer e als o calculate d(se e Attachment s #ll a an d #llb) . Th e propose dlimit s are : Paramete r Ammonia- N (November

1 throug h Ma

y 3 1 whe n monthl y averag e strea mflo w i s les s than 20 0 cfs ) Ammonia- N (November

1 throug h Ma

y 3 1 whe n monthl y averag e streamflo w i s equa l t o or greate r tha n 20 0 cf

s bu t les s than 36 0 cfs ) Ammonia- N (November

1 throug h Ma

y 3 1 whe n monthl y averag e streamflow i s equal t o o r

greate r than 36 0 cfs ) Limitation s Shal l no t excee damonthl y averag e concentratio n o f 2 0 mg/ L an dadail y maximu mconcentratio n o f 4 5 mg/ L Shal l no t excee damonthl y averag e concentratio n o f 2 7 mg/ L an dadail y maximu mconcentratio n o f 6 0 mg/ L N o limitatio n

PAG E 1 8

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Th e ammoni alimit s calculate dusin g th e EP A Gol dBoo k

Criteri aar e considere dinteri mlimits . Th e Departmen t

propose s t o includ e final effluen t ammoni alimitation s whic h ar e t o b e effectiv e upo n EP A approva l o f

th e revise dwate r

quality toxic s criteri afo

r ammonia , A file revie w o f

effluen t monitorin g dat ashow s tha t th e ammoni aconcentration s occasionall y excee d thes e limits . Th e permitte e ma y o r ma y no t currentl y hav e th e ability t o reduc e ammoni alevel s i n th e discharg e t o reduc e potentia l toxi c effect s o n th e receivin g stream . Therefore , th e Departmen t propose s t o includ e aschedul e o f

complianc e i

n Schedul e C o f

thi s permit . Th e Cit y wil l hav e t o compl y wit h th e ne w limi t by n o later

Octobe r 31 , 2009 , Mixing Zone Th e curren t

permi t provide s for

amixin g zon e tha t

consist s o f

tha t portio n o f

th e Puddin g Rive r extendin g fromapoin t

ten (10 ) fee

t upstreamo f

Outfal l 001 A t o apoin t thre e hundre d(300 ) fee t downstrea mfromth e outfall . Th e Zon e o f Immediat e Dilutio n (ZID ) i s define da s that portio n o f

th e allowabl e mixin g zon e that i s withi n thirt y (30 ) feet

of th e poin t o f discharge . Th e effluent

plum e likel y mixe s wit h mor e than 2 5 percen t

o f th e receivin g streamprio r t o 30 0 feet downstreamwhil e Outfal l 001 B i s locate dles s than 30 0 feet downstrea mfromOutfal l 001A , Therefore , th e Departmen t

i s proposin g t o revis e th e existin g mixin g zone . In orde r t o avoi doverlappin g mixin g zone , th e Departmen t

propose s to reduc e th e siz e o f th e mixin g zon e t o tha t

portio n o f

th e Puddin g Rive r wher e th e effluent

mixe s wit

h 2 5 percen t

o f th e streamflo w bu t

i n n o cas e shal l i

t exten dfarther

tha n te n (10 ) fee t upstreamo f

th e outfal l t o apoin t

tw o hundre d(200 ) feet

downstrea mfro mth e outfall . Th e Zon e o f Immediat e Dilutio n (ZID ) shal l b e define da s that portio n o f

th e allowabl e mixin g zon e tha t i s withi n twent y (20 ) fee t

o f th e poin t o f discharge , Th e ne w mixin g zon e i s applie dt o eac h outfall . Chlorin e Th e facility use s ultraviole t ligh t t o disinfec t

th e treate dwastewate r

prio r t o discharge . Th e permi t prohibit s th e us e o f

chlorin e a s adisinfectin g agen t an dstate s that

n o chlorin e residua l shal l b e allowe d i n th e discharge deffluent

du e t o chlorin e use dfo

r maintenanc e purposes . Outfal l 00 2 Th e propose dNPDE S Permi t allow s th e treatmen t

facilit y t o continu e lan dapplicatio n o f treate dan d disinfecte dLeve l II

I reclaime dwate r

t o th e poplar

plantatio n (Outfal l 002) . Th e utilizatio n o f treate d effluent for agricultura l purpose s i s regulate dunde r OAR340-055 . Irrigatio n mus t

b e i n accordanc e wit

h th e limit s i

n Schedul e A , Conditio n l.b . Prio r to irrigatio n o f

th e reclaime dwater , th e discharg e mus t compl y wit

h total colifor

mlimit s base don protectio n o f huma n health du e to huma

n pathogens . Fo r

Leve l II I reclaime dwater , th e limit s includ e aweekl y media n o f 2. 2 total coliformpe r

100 mi s wit

h n o mor e tha

n 2 3 organism s pe r

10 0 mi s i n an y sample . Th e applicatio n o f

reclaime dwate r

mus t b e manage di

n accordanc e wit

h th e approve dReclaime dWate r Us e Plan , Al l reclaime dwate r shal l b e distribute do

n land , fo

r dissipatio n b y evapotranspiratio n an d controlle dseepag e by followin g soun dirrigatio n practice s s o a s t o prevent : Prolonge dpondin g o f

treate dreclaime dwate r

o n th e groun dsurface . Surfac e runof

f or subsurfac e drainag e throug h drainag e tile . Th e creatio n o f

odors , fl y an dmosquit o breedin g o r othe r nuisanc e conditions . Th e overloadin g o f

landwit h nutrients , organics , or

othe r pollutan t parameters . Impairmen t

o f existin g or

potentia l beneficial use s o f groundwater .
PAG E 1 9

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Specifi c crops , applicatio n rate s an dbuffer s ar e approve dby th e Departmen t withi n th e Reclaime dWate r Us e Plan . Th e bacteria l effluen t limitation s ar e achievabl e throug h prope r operatio n an dmaintenance . Outfall s 00 3 throug h 00 5 (Emergenc y Overflows ) Th e permi t

identifie s thre e emergenc y overflo w points . Th e Cit y ha s experience dinfrequent raw sewag e overflow s fro

mth e sewag e collectio n system . Schedul e A contain s aconditio n prohibitin g discharge s fro mthes e outfall s unles s th e caus e o f th e overflo w i s alarg e stor meven t i n accordanc e wit

h OAR340
- 041-0009(6 ) an d(7) . Groundwate r Base do n th e Department' s curren t information , thi s facility ha s alo w potentia l for adversel y impactin g groundwate r

quality . Therefore , th e permi t include s aconditio n i

n Schedul e A tha t

prohibit s any advers e impac t on groundwate r

quality . I

n addition , Schedul e D o f th e propose dpermi t

state s that

n o groundwate r

evaluation s wil l b e require ddurin g thi s permi t cycle , Schedul e B - Minimu m Monitorin g an d Reportin g Requirement s Schedul e B describe s th e minimu mmonitorin g an dreportin g necessary t o demonstrat e complianc e wit h th e condition s o f

thi s permit . Th e authority t o requir e periodi c reportin g by permittee s i s include di n OR S 468,065(5) , Self-monitorin g requirement s ar e th e primar y mean s o f

ensurin g that

permi t limitation s ar e bein g met , However , othe r parameter s nee dt o b e monitore dt o collec t information when insufficient informatio n exist s t o establis h alimit , bu t wher e ther e i s apotentia l for awate r quality concern . I n 1988 , th e Departmen t develope damonitorin g matri x for commonl y monitore dparameters . Th e matri x wa s update di

n 2004 , Propose dmonitorin g frequencie s for al l parameter s ar e base don thi s matri x and , i n some cases , ma

y hav e change dfromth e curren t permit . Th e propose dmonitorin g frequencie s for al l parameter s correspon dt o thos e o f facilitie s o f

similar siz e an dcomplexit y i

n th e state . Th e permitte e i s require dt o hav e alaboratory Quality Assurance/Qualit y Contro l program . Th e Departmen t

recognize s tha t

som e test s d o no t

accuratel y reflec t

th e performanc e o f

atreatmen t

facility du e t o quality assurance/qualit y contro l problems . Thes e test s shoul dno t b e considere dwhen evaluatin g th e complianc e o f

th e facility wit

h th e permi t

limitations . Thus , th e Departmen t i s als o proposin g t o includ e in th e openin g paragrap h o f Schedul e B astatemen t

recognizin g tha t

som e tes t

result s ma

y b e inaccurate , invalid , d o no t adequatel y represen t

th e facility' s performanc e an dshoul dno t b e use di

n calculation s require db y th e permit , Belo w i s adiscussio n o f som e o f th e minimu mmonitorin g requirement s containe di n th e propose d permit : Influen t an dOutfal l 00 1 (Treate dEffluent ) Dail y monitorin g o f

influen t an deffluen t

flow an dcalibratio n o f th e flow meter s ever

y si x month s i s retaine di n thi s permit . Th e Cit y ha s requeste dtha t

al l BOD s effluent

limit s (concentration , mas s an dpercen t removal ) b e change dt o CBOD 5 . Monitorin g o f th e influent

an deffluent

fo r CBOD 5 an dTS S i s retaine dat twic e pe r week . Pound s o f

effluen t CBOD 5 an dTS S mus t b e calculate dat

th e sam e frequency . Ammoni a monitorin g i s require dyear-roun dbot h becaus e CBOD 5 replace s BOD 5 an dt o determin e complianc e with ammoni alimits . Monitorin g mus t b e performe don th e sam e sample s a s CBOD 5 s o twic e pe r wee k monitorin g frequenc y i s proposed .
PAG E 20

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Federa l secondary treatmen t standard s requir e municipa l source s t o achiev e aspecifi c CBOD 5 an dTS S removal efficienc y a s amonthl y average . Reportin g o f th e remova l efficiencie s i s require di n th e curren t permi t an dn o change s ar e proposed , Th e propose dpermi t

require s monitorin g o f

th e effluen t

for U V Radiatio n Intensity o n adail y basi s t o confir mconsisten t

performanc e o f

th e disinfectio n system . Bacteri amonitorin g o f th e effluen t

for E . col i ha s been retaine dat

twic e pe r

week . Monitorin g fo

r E . col i mus t

b e performe di

n accordanc e wit

h on e o f th e method s approve dby th e Department . Monitorin g o f th e influen t

an deffluen t

for p H ha s bee n retaine dat

thre e time s pe r

week . In orde r t o fully characteriz e th e facility' s contributio n o f nutrient s t o th e receivin g stream , th e Departmen t

i s proposin g t o requir e monitorin g o f th e treate deffluen t

for nutrients , Weekl y monitorin g o f Tota l Kjeldah l Nitroge n (TKN) , nitrat e plu s nitrit e an dtotal phosphoru s i s propose dfor th e perio d fro mMa y throug h Octobe r

eac h year . Th e curren t

permi t require dth e Cit

y t o monito r th e effluen t

for dissolve doxyge n twic e pe r wee k from May throug h October . Th e propose dpermi t include s arequiremen t

t o continu e thi s monitoring . Continuou s temperatur e monitorin g o f th e effluen t

i s require dyear

round . I n addition , th e permitte e wil l b e require dt o calculat e th e weekl y averag e o f th e dail y maximu meffluen t temperature s an dth e weekl y averag e exces s therma l loaddischarge dfromMa y throug h October . Thes e ar e ne w requirements . Th e curren t

permi t require dth e City t o monito r th e influen t

an deffluen t

fo r 1 1 metal s an dcyanid e semi
annuall y for

thre e consecutiv e days . Th e propose dpermi t continue s thi s monitorin g requirement . Monitorin g result s ar e t o b e submitte di n th e annual pretreatmen t report an dar e no t

require dt o b e submitte dwit

h th e monthl y DMR . Th e permitte e mus t

perform"priorit y pollutant " scan s i n orde r t o complet e Part

D o f EP A Form2 A for th e nex t renewa l application . Thre e scan s ar e require ddurin g th e 4 Vi year s after permi t issuance , Tw o o f th e thre e scan s mus t

b e performe dn o fewer

than 4 month s an dn o mor e tha n 8 month s apart . A s state d above , th e propose dpenni t require s that

th e pesticid e fractio n b e include din th e monitorin g o f priority pollutants . Th e Departmen t

ha s require dannua l whol e effluent toxicit y (WET ) test s usin g thre e specie s i n th e propose dpermit . I

f th e result s o f

th e first fou r test s sho w that

th e effluen t

i s no t toxic , n o further

WE T testin g wil l b e require ddurin g thi s permi t cycle , WE T test s ar e t o b e conducte din accordanc e with EP A tes t method s an dprocedura l requirement s a s define di n Schedul e D , Fo r th e firs t tw o year s after

permi t issuance , th e Cit

y mus t perfor mspecia l toxic s monitorin g fo r copper , cyanide , lead , mercury , silve r an dzin c i

n th e effluent . Th e specia l toxic s monitorin g shal l b e conducte d usin g a"clean " samplin g method , a n "ultra-clean " samplin g method , EPA metho d166 9 o r an y othe r

tes t metho dapprove db y th e Departmen t wit h adetectio n limi t

o f 0. 1 ug/L o r

less . Monitorin g for

mercur y shal l b e conducte di

n accordanc e wit

h EP A Metho d1631 . Th e effluen t shal l b e sample dfor

hardnes s whe n metal s ar e sampled . After tw o years , th e City ma

y eliminat e th e special monitorin g o f th e effluen t

unles s otherwis e notifie d b y th e Department , Th e Departmen t wil l bas e it s determinatio n upo n th e ability o f th e permitte e t o consistentl y compl y wit

h th e wate r

quality criteria .

PAG E 2 :

### Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Biosolid s OA R340 , Divisio n 50 , "Lan dApplicatio n o f Domesti c Wastewate r

Treatmen t

Facility Biosolids , Biosolid s Derive dProducts , an dDomesti c Septage " require s monitorin g an dreportin g o f specifi c sludg e parameter s unde r

Sectio n 35 , Thes e parameter s ar e identifie di n Schedule ' B unde r

"Biosolid s Management " an dinclude : Tota l solids , Volatil e solids , Nitrogen , eleve n metal s (Ag , As , Cd , Cr , Cu , Pb , Hg , Mo , Ni , S e & Zn) , Phosphorus , Potassiu man dpH , I n orde r t o demonstrat e complianc e wit h pathoge n reductio n requirements , th e propose dpermi t require s monitorin g o f

th e duratio n an dtemperatur e o f biosolid s digestion , I

n orde r t o demonstrat e complianc e wit h vecto r attractio n requirements , th e propose dpermi t require s monitorin g o f

volatil e solid s reduction . Th e City mus t

als o recordinformatio n abou t th e beneficial us e o f

biosolid s tha

t ar e landapplied . Outfal l 00 2 (Reclaime dWater ) Th e propose dpermi t

include s monitorin g o f

th e reclaime dwate r

for volume , chlorin e use dan dresidual , pH , nutrient s an dtota l coliform . Whe n irrigatin g Leve l II I reclaime dwater , th e monitorin g frequenc y fo r tota l colifor

mi s thre e time s per

week , Al l monitorin g frequencie s ar e i n accordanc e wit

h Departmen t rule s an dguidance . Schedul e B als o require s a n annual report

describin g th e effectivenes s o f th e reclaime dwate r

system . Outfall s 00 3 throug h 00 5 (Emergenc y Overflows ) Th e estimate dduratio n an dvolum e o f eac h overflo w fro

mth e emergenc y outfall s mus t b e recorded . Ther e i s n o chang e in thi s requiremen t excep t for th e deletio n o f

on e overflo w poin t

an dth e additio n o f si x ne w overflo w points . Receivin g Stream Th e Departmen t

doe s no t hav e adequat e informatio n o n th e backgroun dconcentratio n o f certai n metal s in th e Puddin g Rive r

an dcanno t

perfor macomplet e reasonabl e potentia l analysis . For th e first year after permi t issuance , th e City mus t perfor mspecia l toxic s monitorin g fo r copper , cyanide , lead , silve r an d zin c i n th e receivin g stream . Th e specia l toxic s monitorin g shal l b e conducte dusin g a"clean " samplin g method , a n "ultra-clean " samplin g method , EPA metho d166 9 o r any othe r

tes t metho dapprove db y th e Departmen t

with adetectio n limi t

o f 0. 1 pg/ L o r

less . Th e receivin g strea mshal l b e sample dfor hardnes s whe n metal s ar e sampled . After on e yea r o f thi s specia l toxic s monitoring, th e requiremen t t o monito r th e receivin g strea mwil l b e eliminated . Reportin g Th e reportin g perio di s th e calendar month . Discharg e monitorin g report s mus t b e submitte dt o th e Departmen t

monthl y b y th e 15t

h day o f th e followin g month . Th e monitorin g report s nee dt o identif y th e principa l operator s designate db y th e Permitte e t o supervis e th e treatmen t an dcollectio n systems . Th e report s mus t

als o includ e record s concernin g applicatio n o f biosolid s an dal l applicabl e equipmen t breakdown s an dbypassing . Schedul e B o f

th e permi t

include s th e requiremen t fo r th e submitta l o f

four annua l reports . Th e condition s ar e standar dlanguag e requirement s concerning : Annua l report

whic h detail s progres s toward s reducin g inflo w an dinfiltratio n Annua l report

o f solid s handlin g activitie s if biosolid s ar e landapplie d Annua l report

o n th e effectivenes s o f

th e reclaime dwate r

syste m Annua l report

o n temperatur e monitorin g result s

PAG E 2 2Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Schedul e C , Complianc e Schedule s an d Condition s Th e permi t

contain s four

complianc e condition s wit h deadlines : 1 , Withi n 180.day s o f

permi t issuance , th e permitte e mus t submi t a n update dprogra

man dtim e schedul e for

identifyin g an dreducin g inflow . 2 . Withi n 9 0 day s after permi t issuance , th e permitte e mus t submi t arepor t whic h identifie s know n sewag e overflows . 3 , B y n o late r

than Jun e 30 , 2005 , th e permitte e mus t submi t fo r Departmen t

approva l apla

n an d schedul e t o provid e redundan t powe r to tw o lif t stations . 4 . Th e permitte e mus t

evaluat e th e alternative s necessary t o compl y wit h th e ne w winte r

perio d ammoni alimi t

an dth e ne w exces s therma l loa dlimit . Al l improvement s mus t b e complete db y n o later tha n Octobe r 31 , 2009 . Th e final conditio n require s th e permitte e t o meet th e complianc e date s establishe di n thi s schedul e o r notif y th e Departmen t

withi n 1 4 day s followin g any lapse dcomplianc e date . Schedul e D - Specia l Condition s Th e permi t

contain s eigh t

specia l conditions . Th e requirement s include : 1 . Schedul e D o f

thi s permi t

include s condition s requirin g biosolid s b e manage di n accordanc e wit

h th e approve dbiosolid s managemen t plan . Al l ne w biosolid s applicatio n site s mus t mee t th e sit e selectio n criteria . Sludg e ma y b e dispose do f

i n aDepartmen t

approve dlandfill . 2 , Th e permi t

ma y b e modifie dto incorporat e change s i n federal biosolid s standards . 3 . Th e requirement s for Whol e Effluent

Toxicity (WET ) testin g ar e specified . 4 . Schedul e D include s aconditio n requirin g th e permitte e t o compl y wit h th e rule s concernin g th e us e o f reclaime dwate r

an dth e Reclaime dWate r Us e Plan approve dby th e Department . 5 , A conditio n i s include di n Schedul e D that

require s th e permitte e t o kee p acove r cro p o n th e irrigatio n sit e at

al l time s unles s otherwis e approve db y th e Departmen t i n th e Reclaime dWate r Us e Plan , Th e Departmen t ha s approve dth e City' s Pla n t o gro w poplar

trees . 6 . Th e permitte e mus t

hav e th e facilitie s supervise db y personne l certifie db y th e Departmen t i n th e operatio n o f

treatmen t

and/o r collectio n systems . 7 , Th e permitte e mus t

notif y th e Departmen t

o f malfunctions , 8 , Th e permitte e shal l no t b e require dt o perfor

mahydrogeologi c characterizatio n o r groundwate r monitorin g du e durin g th e ter mo f thi s permit . Schedul e E - Pretreatmen t Th e curren t

permi t contain s aSchedul e E whic h require s th e City t o conduc t an denforc e a

n industria l wast e pretreatmen t

programa s approve db y th e Departmen t

an dth e Genera l Pretreatmen t Regulation s (4 0 CFRPart

403) , Th e Departmen t

i s proposin g to includ e similar bu t update dcondition s i

n th e ne w permit ,

PAG E 2 3Cit y o f Woodbur n NPDE S Renewa l Evaluatio n Repor t Schedul e F , NPDE S Genera l Condition s Al l NPDE S permit s issue di n th e Stat e o f

Orego n contai n certai n condition s tha t remai n th e sam e regardles s o f

th e typ e o f

discharg e an dth e activity causin g th e discharge , Thes e condition s ar e calle d Genera l Conditions . Thes e condition s can b e change dor modifie donl y o n astatewid e basis , Th e lates t editio n o f th e NPDE S Genera l Condition s i s Decembe r 1 , 199 5 an dthi s editio n i s include da s Schedul e F o f th e draf t permit . Sectio n A contain s standar dcondition s whic h includ e complianc e wit h th e permit , assessmen t o f penalties , mitigatio n o f noncompliance , permi t renewal application , enforcemen t actions , toxi c discharges , property right s an dreference drule s an dstatutes . Sectio n B contain s requirement s for operatio n an dmaintenanc e o f th e pollutio n contro l facilities . Thi s sectio n include s condition s for prope r operatio n an dmaintenance , duty t o hal t o r reduc e activity i

n orde r to maintai n compliance , bypas s o f treatmen t facilities , upse t

conditions , treatmen t

o f singl e operationa l events , overflow s fro mwastewate r conveyanc e system s an dassociate dpum p stations , publi c notificatio n o f effluent violatio n o r

overflow , an ddisposa l o f

remove dsubstances . Sectio n C contain s requirement s for monitorin g an dreporting . Thi s sectio n include s condition s for representativ e sampling , flo w measurement , monitorin g procedures , penaltie s o f

tampering , reportin g o f

monitorin g results , additiona l monitorin g by th e permittee , averagin g o f measurements , retentio n o f records , content s o f

records , an dinspectio n an dentry . Sectio n D contain s reportin g requirement s an dinclude s condition s fo r reportin g planne dchanges , anticipate d noncompliance , permi t

transfers , progres s on complianc e schedules , noncomplianc e whic h ma y endange r publi c healt

h o r th e environment , othe r

noncompliances , an dothe r information . Sectio n D als o contain s signatory requirement s an dth e consequence s o f falsifyin g reports . Sectio n E contain s th e definition s use dthroughou t

th e permit . PERMI T PROCESSING/PUBLI C COMMENT/APPEA L PROCES S Th e beginnin g an den ddat e o f th e publi c commen t

perio dt o receiv e writte n comment s regardin g thi s permit , an dth e contac t

nam e an dtelephon e numbe r ar e include di

n th e publi c notice . Th e permitte e i s th e onl y party havin g standin g t o file apermi t appeal . I f

th e Permitte e i s dissatisfie dwit h th e condition s o f th e permi t

whe n issued , the y ma

y reques t ahearin g before th e EQ C o r it s designate dhearin g officer , withi n 2 0 day s o f

th e fina l permi t bein g mailed . Th e reques t for hearin g mus t

b e sen t t o th e Directo r

o f th e Department . An y hearin g hel dshal l b e conducte dpursuan t t o regulation s o f

th e Department ,

PAG E 2 4

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S i M-K- M JIMM9*Attachmen t2 Septembe r200 4 Biosoli d Managemen tPla n

fo r Th e City o f

Woodbur n Fil e Number : 9881 5 Permi tNumber : 10155 8 I . Treatmen tFacilit y Introduction : Th e Cit y o f Woodburn (populatio n approximatel y 23,000 ) own s an doperate s amunicipal sewag e collectio n an dtreatmen t

syste munde r

Nationa l Discharg e Eliminatio n Syste m(NPDES ) permi t numbe r (101558) . Wastewate r

processe db

y th e sewag e treatmen t

work s i s principall y o f

domesti c origin . Phas e I o f

th e ne w activate dsludg e secondary treatmen t facility wa s place dint o operatio n i n Jun e 2001 . Septag e i s accepte dat thi s wastewate r

treatmen t

facility . Treate deffluent fromth e treatmen t plan t i s discharge dt o th e Puddin g River , i n Mario n County , Oregon , Th e Cit y o f Woodburn implement s aDepartmen t approve dindustria l pretreatmen t program , I

n 2003 , th e City permitte d6 significan t industria l user s (SIUs ) includin g 1 categorica l industria l user ; 3 significan t

industria l users , an d2 non-dischargin g categorica l industries , A ) Wastewate rProcessing : Woodburn operate s aselecto r activate dsludg e plan t

wit h anaerobi c digesters . Th e designe daverag e dr y weathe r flo w o f Phas e I i s 3.3 3 millio n gallon s pe r day (MGD ) Influen t

passe s throug h th e headwork s wit

h tw o mechanica l ba

r screens , screening s compactor , tw o gri t chamber s an dcyclon e gri t separator . Fro mth e headworks , flo w enter s tw o primary clarifier s (170,00 0 gallon s (gal. ) each ) prio r t o enterin g two , anoxi c selecto r activate dsludg e aeratio n basins , Th e aeratio n basin s ar e 930,00 0 gal , each . Fro mth e activate dsludg e basin s mixe dliquo r i s transferre dt o thre e secondary clarifier s (158,00 0 gal. ) each . Tw o continuou s backwas h filters filter clarifie deffluent . Filtere d effluent i s directe dt o ultra-viole t disinfectio n an ddischarge dt o Puddin g Rive r at rive r mil e 21.4 . A percentag e o f

th e solid s fro mth e secondary clarifier s ar e returne dt o th e activate dsludg e basin s an d apercentag e i s waste dt o th e anaerobi c digesters , Th e activate dsludg e i s pre-thickene dto abou t 5 % solid s i n tw o dissolve dai r

flotation-thickenin g unit s prio r t o pumpin g int o a12,000-gallo n sludg e blen dtank . Fro mth e blen dtan k sludg e i s route dto tw o primary anaerobi c digester s (digeste r # 1 i s 48,40 0 gallon s an ddigeste r #2 i s 45,20 0 gallons . I

n Phas e I I o f constructio n digeste r

# 3 wil l b e 73,90 0 gallons) . A t

th e maximu mmonth s sludg e loadin g th e digeste r detentio n tim e i s 2 1 days , B) Solid s Processing : Woodburn' s treatmen t

work s produce s solid s utilizin g primary clarifiers , activate dsludge , an d septage , All thre e sewag e soli dtype s ar e blende dtogethe r i n ablen dtan k

befor e pumpin g t o primar y digesters . Digeste r

sludg e unde r

goe s aminimu mmea

n cel l residenc e tim e o f

betwee n 1 5 an d6 0 day s at aminimu mtemperatur e betwee n 3 5 and5 5 degree s centigrade . After treatmen t

an dprio r t o removal fro

mth e digeste r

volatil e solid s reductio n calculation s ar e performed .Septembe r 200 4 Cit y o f Woodbur n BiosolidManagemen

t Pla n Page 2 o f 1 0 Fou r (4 ) potentia l en droute s for biosolid s include : 1 ) Biosolid s remove dfromth e anaerobi c digester , 2 ) Biosolid s fro mth e facultativ e sludg e storag e lagoons , 3 ) Biosolid s fro mth e air-dryin g beds , an d 4 ) Biosolid s fromStati c aerate dpil e compos t C ) Solid s Storag e Structure : Primar y digeste dsolid s ar e store di n two , tw o an dahal f

acr e facultativ e sludg e lagoon s (tota l gallon s o f abou t 24,400,000. ) Solid s ar e store di n th e lagoon s fo

r a n averag e o f

thre e year s prio r t o removal . Solid s ar e dredge dfromth e lagoo n an deithe r drie di n sludg e dryin g bed s an dlan d applie da s asolid , o r

applie ddirectl y t o th e poplar tre e reus e syste ma s aliquid . Soli dapplicatio n i s b y spreade r

truc k o r manur e spreade r

an dliqui dapplicatio n i s by aself-retrievin g hos e ree l o r tracto r pulle dliqui dfieldspreaders , D ) Septag e Receivin g Facility : Septag e fro mClackama s an dMario n County pumper s ar e receive da t th e Woodburn wastewate r treatmen t facility . Al l septag e i s processe dusin g alakesid e septi c treatmen t syste memployin g a fin e screen , scre w conveyer , dewaterin g scre w an dscree n press . Th e facility ha s a700 0 gallo n twin-cel l holdin g tan k

system . F ) Pretreatmen tProgram : Th e Cit y ha s aDepartmen t

approve dindustrial wastewate r pretreatmen t

programtha t

complie s wit h al l CFR40 3 requirements , Enforcemen t o f pretreatmen t

standard s ha s produce dabiosoli d wit h lo w metal concentration s compare dt o th e EP A 40CF RPart

50 3 biosoli dstandards . I I Soli d Treatmen tProcesse s Th e Cod e o f

Federa l Regulation s (CFR ) Par t 50 3 an dDEQ' s OAR340-5 0 allo w permittee s t o us e EP A approve dalternative s t o satisf y Clas s A an dB biosolid s pathoge n an dvecto r attractio n reductio n criteria . Th e permitte e mus t notif y th e Departmen t

i n writin g an dge t

approva l prio r

t o an y proces s chang e tha t

woul dutiliz e pathoge n reductio n o r vecto r attractio n reductio n alternative s othe r

tha n thei r

primary reductio n alternative s containe di n thi s managemen t

plan . Th e permitte e mus t

als o certif

y that th e alternative s use dar e EPA approve dan dthat samplin g an d monitorin g conform s t o th e 4 0 CFR50 3 an dOAR340-05 0 regulations . Pathoge n Reductio n Th e Cit y i s require dt o mee t

pathoge n reductio n before or at th e sam e tim e a s vecto r

attractio n reduction s an dcompl y wit h CF RPart

503 ,Septembe r 200 4 Cit y o f Woodbur n BiosolidManagemen

t Pla n Pag e 3 o f 10 Clas s A Biosolid s Clas s A alternative s requir e microbia l monitorin g fo r feca l coliform s or

Salmonella sp , a s describe di

n section s A an dB below . Thi s managemen t pla n describe s th e primary alternative s an doption s employe db y th e permitte e t o mee t Clas s A an dB biosolid s criteria . A ) Monitorin g fo rFeca l Colifor m o rSalmonella sp . Monitorin g for

Fecal Coliformo r

Salmonella sp, i s require dt o detec t th e growt

h o f bacteria l pathogens . Becaus e Clas s A biosolid s ma y b e use dwithou t

sit e restrictions , al l Clas s A materia l mus t

b e teste dto sho w that

microbial requirement s ar e me t a t th e tim e whe n i

t i s read y t o b e used , disposed , sol do r give n away . I

n additio n t o meetin g proces s requirements , Clas s A biosolid s mus t

mee t on e o f th e followin g requirements :

• Eithe r

th e densit y o f

th e feca l coliform s i

n th e biosolid s b e les s than 1,00 0 MP N pe r gramtota l solid s (dry gra mweight) , t Or

th e density of

Salmonella sp . Bacteri ai n th e biosolid s b e les s than 3 MP N pe r 4 gram s o f tota l solid s (dry weigh t

basis) . Unlik e Clas s B biosolids , Clas s A requirement s ar e no t base do n a n averag e value . Samplin g for Clas s A biosolid s consist s o f at leas t seve n (7 ) discret e sample s take n ove r a2-week period . Tes t

result s ar e require dbefore Clas s A material i s release dfor us e o r disposal . Th e microbia l requiremen t

that aClas s A biosolid s mus t mee t i s either : At th e tim e o f

us e o r disposal , or At th e tim e th e biosolid s ar e prepare dfo r sal e o r give n awa y i

n aba g o r othe r containe r for landapplication , or • A t tim e th e biosoli do r

material derive dfro

mth e biosoli di s prepare dt o mee t th e requirement s i

n 503.10(b) , 503.1 0 (c) , 503.1 0 (e ) or 503.1 0 (f) . B) Clas s A Pathoge n Reductio n Alternative s Alt . 3 ) Sewag e Sludg e treate di n know n Processe s 503.32(a ) (5 ) Thi s requiremen t

relie s o n comprehensiv e monitorin g o f bacteria , enteri c viruse s an dviabl e helmit h ov at o demonstrat e adequat e reductio n o f pathogens :

• Eithe r

th e density o f

th e feca l coliform s i

n th e sewag e sludg e i s les s than 1,00 0 MPN pe r gramtota l solid s (dry gra mweight) , Or

th e densit y of

Salmonella sp . Bacteri ai n th e sewag e i s les s tha

n 3 MP N per 4 gram s o f

tota l solid s (dr y weigh t

basis) . • Th e density o f

enteri c viruse s i

n th e sewag e sludg e mus t b e teste dprio r

t o pathoge n reductio n treatmen t

an dthe n agai n after

pathoge n treatmen t

at whic h tim e th e enteri c viruse s mus t

b e les s than 1 PFU per

4 gram s o f

tota l solid s (dr y weigh t

basis) . • Testin g fo

r th e density o f

viabl e helmit

h ov ain th e sewag e sludg e mus t occu r before pathoge n reductio n treatmen t an dthe n again , after

pathoge n treatment . Th e final tes t for viabl e helmit

h ov amus t

b e les s tha

n 1 PF U pe r 4 gram s o f

tota l solid s (dry weigh t basis) .Septembe r 200 4 Cit y o f Woodbu m BiosolidManagemen

t Pla n Page 4 o f 1 0 503.3 2 (a) (7 ) Alt . 5 ) Eithe r th e density o f

feca l colifor mi n th e sewag e sludg e shal l b e les s tha n 1000 Mos t

Probabl e Numbe r

per gra mo f total solid s (dry weigh t

basis) , o r th e density o f Salmonella , sp . Bacteri ain th e sewag e sludg e shal l b e les s tha n thre e Mos t Probabl e Numbe r pe r four gram s o f tota l solid s (dry weigh t

basis ) a t th e tim e th e sewag e sludg e i s use dor disposed . Sewag e sludg e that

i s use do r

dispose dshal l b e treate di n on e o f th e Processe s t o Furthe r Reduc e Pathogen s describe di n Appendi x B o f

CFR503 . Clas s B Biosolid s Clas s B biosolid s ca

n b e me t by usin g on e of

thre e alternatives , th e tw o primar y alternative s use dby thi s facility ar e Alt . 1 ) Monito r sewag e sludg e fo

r feca l coliform503.32(b)(2) , an d Alt . 2 ) Us e Proces s t o Significantl y Reduc e Pathoge n (PSRP ) 503.32(b)(3) . Alt . 1 ) Monito r

sewag e sludg e for

feca l colifor m503.32(b ) (2 ) require s tha t seve n sample s o f treate dsewag e sludg e (biosolids ) b e collecte dan dthat th e geometri c mea

n feca l colifor m density o f thes e sample s b e les s tha n 2 millio n MP N per dr y gra mbiosoli d(dry weigh t basis) . Alt . 2 ) Us e Proces s t o Significantl y Reduc e Pathoge n (PSRP ) 503.32(b)(3 ) consider s sludg e treate di n on e o f th e PSRP s liste di

n Appendi x B of

th e 4 0 CF RPart

50 3 t o mee t

Clas s B biosoli dcriteri afor

pathoge n reduction , Fo r thi s facility th e followin g PSRP s ar e primaril y used :

• #2 Ai r

Drying , sludg e ai r

drie don bed s for

minimu mo f

3 month s (ambien t

temperatur e abov e 0 C (32F ) 2 ou t

o f th e 3 months , • # 3 Anaerobi c digestion , sludg e i s treate di n th e absenc e o f

air/oxyge n for

aspecifie d residenc e tim e at

aspecifie dtemperature . Value s o f th e mea n cel l residenc e tim e an d temperatur e shal l b e betwee n 1 5 day s a t 35 C t o 55 C (1 3 IF ) an d6 0 day s at 20 C (68F ) • # 4 Composting , th e temperatur e o f th e sewag e sludg e i s raise dt o 40 C (104F ) o r highe r an dremain s at

40 C o r highe r for 5 days . Fo r

4 hour s durin g th e 5-da

y period , th e temperatur e i

n th e compos t

pil e mus t excee d55 C (1 3 IF) , an d • # 5 Lime stabilization , sufficien t lime i s adde dto th e sewag e sludg e to rais e th e p H o f th e sewag e sludg e t o 1 2 wit

h n o further

additio n o f

alkal i agent , an dmaintai n sludg e p H o f 1 2 active-mi x fo

r 2-hours , B) Vecto rAttractio n Thi s facility primaril y use s vecto r attractio n reductio n Optio n # 1 t o satisf

y thei r 4 0 CF R50 3 volatil e solid s reductio n requirements . Opt . 1 ) Th e % volatil e soli dreductio n calculatio n t o us e for anaerobi c digeste r

that i s decante d an dtha t doe s no t hav e appreciabl e gri t

accumulatio n woul db e th e Van Kleec k o r Approximat e Mas s balanc e (AMB ) equatio n dependin g upo n th e percen t solid s i n th e decantante . (se e Attachmen t2A )Septembe r 200 4 Cit y o f Woodbur n BiosolidManagemen

t Pla n Page 5 of 10 T o mee t th e biosoli dvecto r

attractio n reductio n requirement s a n aerobi c digeste r

mus t provid e a 4 0 da y detentio n tim e at

20 C i n acompletel y mixe dhig h rat e digeste r i n orde r t o achiev e a volatil e solid s reductio n o f 3 8 % o r more . Ther e ar e alternativ e volatil e soli dreductio n method s tha t ar e deeme dequivalen t

t o th e 38 % volatil e soli dreductio n criteri aunde r th e EPA' s an dth e DEQ' s regulations . Opt , 2 ) Whe n th e 38 % volatil e solid s reductio n ca n no t b e me t for anaerobicall y treate dsolid s vecto r attractio n reductio n ca

n b e demonstrate db

y showin g ales s than 17 % additiona l volatil e soli dlos s durin g bench-scale anaerobi c batc h digestio n o f th e sewag e sludg e for

4 0 additiona l day s a t 3 0 t o 37C . Opt . 4 ) Th e Specifi c Oxyge n Uptak e Rate (SOUR ) for sewag e sludg e treate di

n a n aerobi c proces s shal l b e equa l t o or les s tha n 1. 5 milligram s (mg ) o f

oxyge n pe r

hou r pe r gra mo f total solid s (2 % or

les s tota l solids , dr

y weigh t basis ) at atemperatur e o f

2 0 C . Opt.5 ) Aerobi c treatmen t o f sludg e fo r at leas t 1 4 day s a

t ove r 40 C (104F) , durin g th e proces s th e averag e temperatur e mus t b e ove r 45 C (Compost) , Opt , 6 ) Th e p H o f

th e sewag e sludg e shal l b e raise dt o ap H o f 1 2 or highe r by th e additio n alkal i agen t an dwithou t

th e additio n o f

more alkal i agent . Th e batc h shal l remai n at ap H o f 1 2 or , fo r tw o hour s o r

mor e activ e mix ; an dat

ap H o f 11, 5 o f highe r fo r a n additiona l 2 2 hours . Opt . 7 ) Th e sewag e sludg e mus t achiev e 75 % soli dby dryin g prio r t o mixin g wit

h othe r materials . Sewag e sludg e treate di

n aerobi c o r

anaerobi c proces s (i.e . Sewag e sludg e tha t doe s no t contai n unstabilize dsolid s generate di n secondary wastewate r

treatment) , Opt . 8 ) Th e sewag e sludg e mus t achiev e 90 % soli db y dryin g prio r t o mixin g wit

h othe r materials . Sewag e sludg e treate di

n aerobi c o r

anaerobi c proces s (i.e . Sewag e sludg e that contain s un stabilize dsolid s generate di n primar y wastewate r

treatment) . Op t 10) Sewag e sludg e landapplie dan dshal l b e incorporate dinto th e soi l withi n si x hour s o f lan dapplication , C ) Batc h Processe s Clas s A Biosolid s Alt . 5 , PFR P Compost , compos t pil e mus t meet PFRP ) o f

3 consecutiv e day s at

aminimu mpil e temperatur e o f

55C . (Note : Clas s A PFR P mus t b e me t withi n th e Clas s B PSRP treatmen t parameter , EP

A requirement) . Clas s B Biosolid s Alt . 3 , #4 PSRP ) Compost , Proces s that Significantl y Reduce s Pathogen s (PSRP ) showin g a n averag e pil e temperatur e o f 45 C an dminimu mtemperatur e o f 40 C i n th e pil e withi n 1 4 consecutiv e days .Septembe r 200 4 Cit y o f Woodbur n Biosoli dManagemen

t Pla n Pag e 6 o f 1 0 Note : Clas s B compos t

(PSRP ) ha s t o b e demonstrate dthroug h aerobi c (tim e an dtemperature ) before o r at th e sam e tim e vecto r

attractio n reductio n satisfie dth e PSRP compostin g process . Il l Biosoli d Characteristic s Woodburn generate s approximatel y 90 0 metri c dr y ton s of biosolids . Woodburn lan dapplie d (940 ) dr y metri c ton s o f

Clas s B biosoli di

n 2003 . 4 0 CFR503,1 6 require s Woodburn t o sampl e an dmonito r

thei r biosolid s four

time s pe r

year . Monitorin g frequenc y depend s on th e amoun t o f biosolid s th e facility generate s (metri c tons ) tha t i s sol do r give n away , landapplie dand/o r surfac e disposal . After

th e sewag e sludg e ha s been monitore dfo r tw o year s at

th e frequenc y i

n Tabl e 1 o f

503.16 , th e City ma

y petitio n th e Departmen t t o reduc e th e monitorin g o f metal s an d pathoge n t o onc e ayear . Samplin g : Refe rto Biosoli d Samplin g Pla n develope d i n accordanc e wit h Tes tMethod s fo r Evaluatin g Soli d Waste , Volum e 2 ; Fiel d Manual , Physical/Chemica l Methods , Novembe r1986 , Thir d Edition , Chapte r9 . Biosoli d Analysis : Biosoli d Chemica l Analysis : Th e City o f

Woodbur n operate s wastewate r treatmen t

plan t of f highwa y 211 . Th e facility i s situate do n 15 0 acres . 9 0 acre s o f th e 15 0 t o th e nort

h an deas t

o f th e facility ar e use dfo

r biosoli d lan dapplicatio n an deffluen t use . Fro mth e Woodburn' s 200 3 biosoli danalysi s th e followin g i s a representativ e samplin g o f th e biosoli dmetal concentration . Meta l mg/k g Arseni c (As ) 5,9 3 Cadmiu m(Cd ) 0,43 1 Chromiu m(Cr ) 23, 4 Coppe r (Cu ) 32, 5 Lead(PB ) 10, 7 Mercury (Hg ) 0.22 8 Molybdenu m(Mo ) 2.1 6 Nicke l (Ni ) 18. 3 Seleniu m(Se ) 0.43 1 Zinc(Zn ) 13 8 Th e sit e lif

e woul db e limite dto (851 ) year s base do n th e arseni c loadin g Woodburn' s 2003
- biosoli danalysi s (Attachmen t2B) . Biosoli d Nutrien tAnalysis : Fo r th e year 2003 , th e biosoli dcontaine dabou t (2273 ) pound s (lb. ) tota l nitroge n (N ) o f whic h abou t (1061 ) lb . wa s i

n th e nitrat e for

m(N03-N02 ) an d(788 ) lb . wa s i n th e ammoni afor

m (NH3) . Fro mth e analysi s th e Woodburn need s approximatel y (23 ) acre s t o lan dappl y on popla r tree s (26 0 lb , PAN/ac-yr ) t o handl e thei r annua l biosoli dnitroge n production .

#/acre-yr . 0.00 3 0.000 2 0.012 6 0.017 5 0.005 8 0.000 1 0.001 2 0.009 9 0.000 2 0,074 3 sit e li

f 85 1 114 4 631 6 568 4 345 3 918 2 427 6 282 7 2857 4 249 9Septembe r 200 4 Cit y o f Woodbu m BiosolidManagemen

t Pla n Page 7 o f 1 0
I V Biosolid s Beneficia l Reus e Progra m Transportatio n an d Lan d Application : Biosolid s ar e offloade dinto city owne d(1 0 yard. ) spreade r truc k at th e plant . Th e biosolid s loadin g area s ar e impounde di n cas e o f accidenta l spillag e o f

biosolid s durin g th e truc k loadin g process . Durin g th e summe r months , Woodburn' s biosolid s ar e lan dapplie do n several Cit y owne dsites . Fo r

th e year 200 3 Woodbur

n lan dapplie dt o severa l DE Q authorize dsite s totalin g abou t 72-acres . Th e biosoli dlan dapplicatio n site s ar e capabl e o f assimilatin g Woodburn' s annua l tota l nitroge n production . Th e agronomi c biosoli dlan dapplicatio n rat e for poplar tree s i s 26 0 lb . availabl e N pe r

acre-yr . Lan d application : Woodburn landapplie s on authorize dpoplar reus e sites . Al l DE Q sit e authorization s for

Woodbur n ar e part

o f Woodburn' s Biosoli dManagemen t Plan , Th e Cit

y o f Woodburn currentl y ha s atota l o f 9 0 acre s authorize dfor

lan dapplication . Th e site s ar e locate d o n th e Woodburn wastewate r facilit y compound . Woodburn Biosolid s Sit e Managemen t Information : Sit e 

### #1 # 2 # 3 U #5 #6 

### # 7 # 8 # 9 

### #1 0 #1 1 #1 2 Tota l Use / acre s 

### 7 7 7 7 7 7 7 7 7 6, 3 

### 7 3. 3 8 0 lb . "N/acr e



### 26 0 26 0 26 0 26 0 26 0 26 0 26 0 26 0 26 0 26 0 26 0 26 0 lb . N/sit e 182 0 182 0 182 0 182 0 182 0 182 0 182 0 182 0 182 0 163 8 182 0 

### 85 8 2069 6 Lon g ter mbiosoli dapplicatio n rate s an dsit e restriction s ar e containe di n th e biosoli dsit e authorizatio n letter . Reference s to th e OAR340-50 , Th e 4 0 CF RPart 503 , sit e setbacks , sit e agronomi c loadin g rates , lan dapplicatio n restriction s an dsit e restriction s ar e als o detaile dou t i n th e sit e authorizatio n letter . V Contingenc y Option s I n th e even t

biosolid s ar e spille dbetwee n th e treatmen t facility an dth e lan dapplicatio n site , Woodburn' s sewag e treatmen t work s shal l contai n th e spil l wit h lim e o r absorben t

(fo r exampl e sand ) an dremov e spille dsludg e solid s wit h afront-en dloade r

o r shovels . Th e biosolid s wil l b e dispose do f

at aDE Q authorize dsite . Al l spill s into water s o f th e stat e o r

spill s on th e groun dSeptembe r 200 4 Cit y o f Woodbur n BiosolidManagemen

t Pla n Page 8 o f 1 0 surfac e tha t

ar e likel y t o ente r

water s o f th e stat e shal l b e reporte dimmediatel y t o Orego n Emergenc y Respons e Syste m(OERS ) at 1-800-452-0 3 1 1 an dyou r regiona l biosolid s coordinato r at (541 ) 440-3338 , Al l spill s o f 2 5 gallon s or

mor e on th e groun dsurfac e shal l b e report t o th e regiona l biosolid s coordinato r a t (541 ) 440-3338 . V I Reportin g Dail y Reportin g an d Recordkeeping : Eac h yea r befor e th e lan dapplicatio n o f biosolids , th e sourc e operator s shal l chec k t o se e i f contiguou s property owner s hav e changed . Th e operator s shal l kee p arecordo f contac t (date , and/o r writte n lo g o f

phone/lette r

cal l w / nam e andnumber , and/o r xero x o f postcar dw /

nam e an d address , etc,, ) wit

h al l contiguou s lan dapplicatio n property owners , an dnotif y any ne w neighbo r at th e beginnin g o f

th e lan dapplicatio n seaso n o f th e city' s inten t

t o lan dappl y biosolid . Operato r shal l provid e thi s documentatio n i n th e annual biosoli dreport . Annua l Reportin g Th e Annual Biosoli dRepor t i s du e February 19 , o f

eac h yea r for th e previou s year s lan dapplie d biosolids . Part

o f thi s repor t

i s th e submittal o f

th e dail y sit e logs , whic h hav e th e date , time , an d quantity gal-lb . N/acr e lan dapplie dfor eac h clay-tank-batc h lan dapplied . Sit e log s shal l hav e a scale dma p showin g th e sit e an dth e landapplicatio n locatio n that coincide s wit

h th e dail y sit e loadin g method s (truc k

spreader'bar , irrigatio n cannon) . Dail y record s shoul dclearl y sho w th e locatio n o f

dail y biosoli dloadin g sit e log . Th e Annual Repor t

shal l contai n asigne dcop y of th e certificatio n statement s fo r pathoge n reduction , vecto r

attractio n reductio n an dbiosolid s ha s bee n lan dapplie dat approve dagronomi c loading . Th e perso n signin g th e statement s shoul db e th e operator o f recor dat th e treatmen t

plant . Th e operato r

shal l sho w ho w th e vecto r attractio n reductio n wa s met i.e. , volatil e solid s reductio n wa s achieve db y tim e an dtemperature , th e Va n Kleec k equatio n fille dou t

with digeste r

record s (MCRT) , benc h scal e test , sou r tes t o r any othe r EP A approve dalternativ e metho dappropriate d fo r biosoli dgenerate dat

you r facility . Certificatio n o f

pathoge n reductio n i s require dandi s satisfie db y submitta l o f

tes t result s i n th e Annual Biosoli dRepor t A M th e previou s year' s biosolid s samplin g an danalysi s tha t i s require dby th e permi t shal l b e include di

n Woodburn' s Annual Biosoli dRepor t

(i n th e year' s annual repor t appendix) . VI I Certificatio n Statemen t Woodburn' s facility i s capabl e o f meetin g thei r

primar y alternative s for

achievin g Clas s A or

B biosoli dpathoge n an dvecto r attractio n reductio n criteria . A s require dunde r 40CF R503.1 7 a signe dClas s A and/o r

B biosoli dan dvecto r

attractio n certificatio n statement s shal l accompan y al l biosolid s tha t

ar e lan dapplie d(se e Attachmen t 2C) . Fo r

Clas s A o r

B biosoli dannual biosoli danalysi s mus t

b e provide dupo n request . Certificatio n statement s mus t als o sho w conformanc e wit

h nutrien t an dlandapplicatio n loadin g rate s wher e applicable .Septembe r 200 4 Cit y o f Woodbu m BiosolidManagemen

t Pla n Page 9 o f 10 Attachmen t 2A : Calculatio n o f

th e % volatil e solid s reductio n fo r th e aerobi c digester s i s t o b e base do n compariso n o f arepresentativ e grab sampl e o f total an dvolatil e solid s enterin g th e digestio n proces s ( aweighte d blen do f th e primary an dsecondar y clarifie r solids ) an darepresentativ e composit e sampl e o f th e solid s existin g th e sludg e holdin g tanks . Typicall y i

n th e pas t we'v e use dth e Va

n Kleec k equatio n fo r

digesters . Th e assumptio n i s tha t ther e i s n o gri t accumulatio n i

n th e digester . Thi s volatil e solid s equatio n assume s th e fixedsolid s inpu t equal s th e fixe dsolid s output . Th e Va n Kleec k equatio n i s appropriat e if th e digeste r

decatant e i s lo w i n tota l solids . Th e Van Kleec k equatio n ca

n b e use dt o calculat e th e volatil e solid s reductio n fo r adigeste r tha t decant s provide dVS b equal VS d FVSR : Fractiona l Volatil e Solid s Reductio n FVS R= 1 - VS b * ( 1 -VSf ) / VS f ( I - VSb ) VS f Fee dSludg e Fractiona l Volatil e Solid , (kg/kg ) VS b Digeste dSludg e (digeste r bottom ) Fractiona l Volatil e Solids , (kg/kg ) VS dDecantat e Fractiona l Volatil e Solid s Fo r thi s equatio n t o b e vali dVS b mus t equa l VSd . Fo r digester s wit

h decan t withdrawa l (decan t

hig h i n solids ) an dn o gri t

accumulation , wher e th e volatil e an dfixe dconcentration s ar e know n fo r al l stream s a s wel l a s th e volumetri c flow rate s fo r th e decan t an ddigeste r

sludg e the n th e Approximat e Mas s Balanc e equatio n shoul db e used . FVSR : Fractiona l Volatil e Solid s Reductio n FVS R= Fyb - Byb - Dy d/ Fy b Fy b (F ) Fee dSludg e Volumetri c Flo w Rat e (m3/d ) (yb ) Fee dSludg e Volatil e Solid s Concentratio n (kg / m3 ) By b (B ) Digeste r

Sludg e (bottom ) Volumetri c Flo w Rat e (m3/d ) (Bb ) Digeste r

Sludg e (bottom ) Volatil e Solid s Concentratio n (kg / m3 ) Dy d(D ) Decantat e Volumetri c Flo w Rat e (m3/d ) (yd ) Decantat e Volumetri c Solid s Concentratio n (kg / m3 ) Assumptions : Fixe dSolid s an dVolatil e Flow s Streams ,Septembe r 200 4 Cit y o f Woodbur n BiosolidManagemen

t Pla n Pag e 1 0 o f 1 0 Attachmen t2C :

"I certify , unde r

penalty o f

law , tha t th e pathoge n requirement s i n [insert eithe r 503.32(a ) or 503.32(b)] , th e managemen t practice s i

n 503.1 4 an dth e vecto r

attractio n reductio n requirement s in [insert 503.33(b ) (1 ) throug h 503.33(b ) (10) ] hav e been met . Thi s determinatio n ha s bee n mad e unde r m y directio n an dsupervisio n i n accordanc e with th e syste mdesigne dt o ensur e that qualifie d personne l properl y gathe r an devaluat e th e informatio n use dt o determin e tha t th e pathoge n requirement s an dvecto r

attractio n reductio n requirement s hav e been met , 1 als o certif y that al l biosolid s wer e lan dapplie dat th e approve dagronomi c loadin g rate note di n th e respectiv e Departmen t

sit e authorizatio n letter , I a mawar e that

ther e ar e significan t

penaltie s for

fals e certificatio n includin g th e possibilit y o f fine an dimprisonment, "
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## Attachmen t 5 Appendi xB : Antidegradatio n Revie w Shee t ANTIDEGRADATIO N REVIE W SHEE T FO RA PROPOSE D INDIVIDUA L NPDE S DISCHARG E 1 . Wha t i s th e nam e o f

Surfac e Water

that receive s th e discharge ? Puddin g Rive r Briefl y describ e th e propose dactivity : Municipa l Wastewate r Treatmen t I s thi s revie w fo

r a^renewal ) O Rne w (circl e one ) permi t application ? G o t o Ste p 2 . 2 . I s thi s surfac e wate r a n Outstandin g Resourc e Wate ro r upstrea m froma

n Outstandin g Resourc e Water ? No . G o t o Ste p 3 , 3 . I s thi s surfac e wate r aHig h Quality Water ? No , G o to Ste p 4 , 4 . I s thi s surfac e wate r aWate rQuality Limite d Water ? Yes . G o t o Ste p 14 , 14 , Wil l th e propose dactivity resul t i n aLowerin g o f

Wate r Quality i n th e Wate r Quality Limite d Water ? [se e OAR340-04 1 -0004(3)-(5 ) for adescriptio n i n rul e o f discharge s that

d o no t resul t i n lowerin g o f

wate r quality o r

d o no t constitut e a ne w and/o r

increase ddischarg e o r

ar e otherwis e exemp t

fromantidegradatio n review ; otherwis e se e "I s a n Activity Likel y t o Lowe r Wate r Quality? " i n Antidegradation Policy Implementation Internal Management

Directive for NPDES Permits and

Section 401 Water

Quality Certifications.} No , Procee dwit

h Permi t Application . Applican t

shoul dprovid e basi s fo

r conclusion . G o t o Step 2 1 ,

### 21 , O n th e basi s o f th e Antidegradatio n Review , th e followin g i s recommended :

_ X Procee dwith Applicatio n t o Interagenc y Coordinatio n an dPubli c Commen t Phase . Den y Application ; return t o applican t

an dprovid e publi c notice . Actio n Approve d Section : DE Q Western Regio n W Q Revie w Prepare dBy : Mar k E . Hamli n Phone : (503 ) 378-8240 , ext . 23 9 Dat e Prepared : Septembe r 10 . 200 4 Pleas e provid e th e followin g informatio n an dsubmi t with th e complete dapplicatio n for m to : Departmen t

o f Environmenta l Quality Wate r Qualit y Division—Surfac e Wate r Managemen t 81 1 S W Sixth Avenu e Portland , Orego n 97204-139 0 Name : Nam e o f Company : Address :
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## Wastewate rSyste m Classificatio n Workshee t fo rOperato rCertificatio n OA R 340-049-002 0 Genera l Requirement s {OA R 340-049-0015 ) - Eac h owne ro f a regulate d wastewate rsyste m mus t hav e it s syste m supervise d by on e o rmor e operator s wh o hol d a vali d certificat e fo rth e typ e o f system , wastewate r treatmen t o rcollection , an d a t a grad e equa l t o o rgreate rtha n th e wastewate rsyste m classificatio n a s define d i n OAR-340-049-002 0 an d 0025
. DE Q wil l advis e syste m owner s o f th e classificatio n o f thei rsystem s a s a permi t action
. A s th e classificatio n establishe s th e operato r certificat e typ e an d grad e require d fo r compliance , i t need s t o b e se t prio r t o "start-up " o f a ne wo r upgrade d and/o r expande d facility . Wastewate rtreatmen t syste m classification s wil l b e derive d fro m th e tota l point s assigne d base d o n criteri a show n i n OA R 340-049-002 5 (se e Classificatio n Worksheet)
. Collectio n syste m classification s ar e base d o n desig n populatio n o rpopulatio n equivalen t t o b e serve d b y a wastewate rtreatmen t syste m (se e Worksheet)
. Upon written notice to the wastewater

system owner, DEQ

may classify a wastewater

treatment

system higher than the classification

based on accumulated

points if the complexity

of a treatment

system is not reflected

in the criteria(see

Worksheet

examples). If

deemed appropriate, DEQ

may classify a wastewater

collection system higher than the classification

based on population

when a Class I by population

will have significant pumping of sewage including

S TEP or other pumping

that may warrant a Class II designation. In

either case, designation

must be consistent

with the intent of the classification

system (see OAR 340-049-0020(4)

& (5)). Classificatio n o f Wastewate r System s (OA R 340-049-0020 ) Al l wastewate rsystem s regulate d unde rOA R 340-04 9 wil l b e classifie d b y DE Q a s wastewate rtreatmen t system s and/o rwastewate rcollectio n systems , a s appropriate , i n accordanc e wit h th e followin g classificatio n system :

Wastewate rTreatmen t System s Clas s I - 3 0 tota l point s o rles s Clas s I I - 31-5 5 tota l point s Clas s H I - 56-7 5 tota l point s Clas s I V - 7 6 o rmor e point s Wastewate rCollectio n System s Clas s I -1,50 0 o rles s desig n populatio n Clas s I I -1,50 1 t o 15,00 0 desig n populatio n Clas s II I -15,00 1 t o 50,00 0 desig n populatio n Clas s I V - 50,00 1 o rmor e desig n populatio n Definition s use d i n thes e regulation s unles s otherwis e require d b y contex t (se e OA R 340-049-0010) : "Averag e Dr

y Weathe r Flow " (ADWF ) mean s th e desig n averag e dr y weathe rflo w capacit y o f th e wastewate rtreatmen t syste m i n gallon s pe rda y o rMillio n Gallon s pe rDay (MGD) , a s approve d b y th e Department
. "Industria l Waste " mean s liqui d waste s fro m a n industria l o rcommercia l proces s discharge d int o a wastewate rsyste m fo r conveyanc e an d treatment . "NPDE S Permit " mean s a wast e discharg e permi t issue d i n accordanc e wit h requirement s an d procedure s o f th e Nationa l Pollutan t Discharg e Eliminatio n Syste m authorize d by Sectio n 40 2 o f th e Federa l Clea n Wate rAc t an d OA R 340 , Divisio n 45
. "Population " mean s th e desig n populatio n o f th e wastewate rsyste m represente d a s th e numbe ro f peopl e o rth e populatio n equivalen t th e syste m i s designe d t o serve . Equivalen t populatio n ordinaril y i s determine d base d o n 7 0 gallon s pe rperso n pe rday averag e dr

y weathe rflo w (ADWF ) o r0.1 7 lbs
. BOD S pe rperso n pe rday , whicheve ri s greater . "Wastewater " o r"sewage " mean s th e water-carrie d huma n o ranima l wast e fro m residences , buildings , industria l establishment s o rothe rplaces , togethe rwit h suc h groundwate rinfiltratio n an d surfac e wate ra s ma y b e present . Th e admixtur e o f domesti c an d industria l wast e o rothe rby-products , suc h a s sludge , i s als o considere d wastewate ro rsewage . "Wastewate r Treatmen t System " o r"Sewag e Treatmen t System " mean s an y structure , equipmen t o rproces s fo rtreatin g an d disposin g of , o rrecyclin g o rreusin g wastewate ran d sludg e (includin g industria l waste ) tha t i s discharge d t o th e wastewate rsystem , "Wastewate r Collectio n System " o r"Sewag e Collectio n System " mean s th e trunks , arterials , pumps , pump/lif t stations , pipin g an d othe rappurtenance s necessary t o collec t an d can y awa y wastewate ro rothe rliqui d wast e treatabl e i n a communit y o rprivat e wastewate rtreatmen t facility , "Wastewate r System " mean s "Sewag e Treatmen t Works " define d i n OR S 448.40 5 a s an y structure , equipmen t o rproces s require d t o collect , carry awa y an d trea t domesti c wast e an d dispos e o f sewag e a s define d i n OR S 454.010
. Typically , component s o f a wastewate rsyste m includ e a wastewate rcollectio n syste m an d a wastewate rtreatmen t system . "WPC F Permit " mean s a Wate rPollutio n Contro l Facilitie s permi t t o construc t an d operat e a collection , treatmen t and/o r disposa l syste m wit h n o discharge t o navigabl e waters .

## Wastewate rSyste m Classificatio n Workshee t fo rOperato rCertificatio n OA R 340-049-002 0 W W Syste m Commo n Name : Woodbur n Wastewate rTreatmen t Facilit y Facilit y ID : 9881 5 Location : 281 5 Molall a Roa d Tota l Point s (fro m pag e 3) : 95
_ Desig n Population 1 : 4750 0 Desig n ADW F loa d (Influen t MGD ) 3.3 3 Classifie d by : Mar k

E
. Hamli n Dat e thi s classificatio n file d wit h th e Operato r Certificatio n office : WW T Clas s (check) : Q l D I I D H I S I V WW C Clas s (check) : D l D I I I S II I •I V Desig n BO D loa d (Influen t Ibs./day ) 720 0

Date : 9/10/0 4 Syste m start-u p dat e fo r thi s classificatio n (new , upgrad e o r expansion) : I s thi s a chang e fro m a prio r classification ? (check) : •Ye s {E l N o 

## Criteri a fo rClassifyin g Wastewate rTreatmen t System s (OA R 340-049-0025 ) (1 ) Desig n Populatio n o r Populatio n Equivalen t Point s (1 0 Point s • Les s tha n 75 0 

### • 75 1 t o 2000 • 200 1 t o 500 0 • 500 1 t o 10,00 0 [x ] Greate rtha n 10,00 0 Poin t subtota l laximum ) 0, 5 point s 1 poin t 1. 5 point s 2 point s 3 point s EJU S 1 pe r10,00 0 (2 ) Averag e Dr

y Weathe r Flo w(Desig n Capacity ) Point s (1 0 point s Maximum )
• Les s tha n 0,07 5 MG D • Greate rtha n 0.07 5 t o 0. 1 MG D • Greate rtha n 0. 1 t o 0. 5 MG D • Greate rtha n 0. 5 t o 1. 0 MG D L E Greate rtha n 1, 0 MG D (3 ) Uni t Proces s Point s (Chec k al l tha t apply ) Preliminar y Treatmen t an d Plan t Hydraulics : • Comminutio n (include s shredders , grinders , etc. ) Q Gri t Removal , gravit y IE l Gri t Removal , mechanica l tE l Screen(s) , in-sit u o rmechanica l • Pump/Lif t Station(s ) (pumpin g o f mai n flow ) • Flo w Equalizatio n (an y type ) Primary Treatment : • Communit y Septi c Tank(s ) fX ] Clarifier(s ) n Flotatio n Clarifier(s ) • Chemica l Additio n Syste m • Imhoff Tan k

(o rsimilar ) Poin t subtota l

Poin t subtota l 0, 5 poin t 1 poin t 1. 5 point s 2 point s 3 point s plu s 1 pe r1 6. 3
1 poin t 1 poin t 2 point s 1 poin t 2 point s 1 poin t 3 1G D

Poin t subtota l Tota l Point s Pag e 1 2 p o 5 p o 7 p o 2 p o 3 p o 5 2 2 ! nt s 'nt s int s 'nt s 'nt s Pag e 1 o f 3
1 See "Population " definition
. Use th e desig n averag e dail y pe rperso n loa d fo rInfluen t Flo w o rInfluen t BODS , whicheve r i s greater . Thi s valu e i s als o use d t o determin e th e Collectio n Syste m Classification
.

## Wastewate rSyste m Classificatio n Workshee t

Uni t Proces s Point s - Continue d (Chec k al l tha t apply ) Secondary , Advanced , an d Tertiar y Treatment : • Lo w Rat e Tricklin g Filter(s ) (n o recirculation ) • Hig h Rat e Tricklin g Filter(s ) (recirculation ) • Tricklin g Filte r- Solid s Contac t Syste m [E l Activate d Sludg e (an y type ) D Pur e Oxyge n Activate d Sludg e • Activate d Bi o Filte rTowe rles s tha n 0, 1 MG D D Activate d Bi o Filte rTowe rgreate rtha n 0. 1 MG D • Rotatin g Biologica l Contactor s 1 t o 4 shaft s D Rotatin g Biologica l Contactors , 5 o rmor e shaft s D Stabilizatio n Lagoons , 1 t o 3 cell s withou t aeratio n • Stabilizatio n Lagoons , 1 o rmor e cell s wit h primar y aeratio n • Stabilizatio n Lagoons , 2 o rmor e cell s wit h ful l aeratio n Q Recirculatin g Grave l Filte r • Chemica l Precipitatio n Unit(s ) IE ! Gravit y Filtratio n Unit(s ) • Pressur e Filtratio n Unit(s ) IE ] Nitroge n Removal , Biologica l o rChemical/Biologica l Syste m • Nitroge n Removal , Designe d Extende d Aeratio n Onl y • Phosphoru s Remova l Unit(s ) • Effluen t Microscreen(s ) • Chemica l Flocculatio n Unit(s ) • Chemica l Additio n System(s ) ( 6 point s maximum ) Poin t subtota l Solid s Handling : • Anaerobi c Primar

y Sludg e Digester(s ) w/o Mixin g an d Heatin g (E l Anaerobi c Primar

y Sludg e Digester(s ) wit h Mixin g an d Heatin g • Anaerobi c Primary an d Secondary Sludg e Digester s [E l Sludg e Digeste rGa s reus e • Aerobi c Sludg e Digester(s ) IE l Sludg e Storag e Lagoon(s ) (o rtanks , basin s etc. ) • Sludg e Lagoon(s ) wit h aeratio n • Sludg e Dryin g Bed(s ) IE l Sludg e Ai ro rGravit y Thickenin g • Sludg e Composting , I n Vesse l • Sludg e Belt(s ) o rVacuu m Press/Dewaterin g • Sludg e Centrifuge(s ) • Sludg e Incineratio n • Sludg e Chemica l Additio n Unit(s ) (alum , polymer , etc. ) • Non-Beneficia l Sludg e Disposa l IE l Beneficia l Sludg e Utilizatio n Poin t subtota l Disinfection : •Liqui d Chlorin e Disinfectio n • Ga s Chlorin e Disinfectio n • Dechlorinatio n Syste m IE l Othe rdisinfectio n system s incl
. u traviole t an d ozonatio n Poin t subtota l 7 point s 1 0 point s 1 2 point s 1 5 point s 2 0 point s 6 point s 1 2 point s 7 point s 1 2 point s 5 point s 7 point s 9 point s 7 point s 3 point s 2 point s 4 point s 4 point s 2 point s 4 point s 2 point s 3 point s 2 point s 2 1 5 point s 7 point s 1 0 point s 3 point s 8 point s 2 point s 3 point s 1 poin t 3 point s 1 2 point s 5 point s 5 point s 1 2 point s 2 point s 1 poin t 3 point s 1 5 2 point s 5 point s 4 point s 5 point s 5 Tota l Point s Pag e 2 4 1 Pag e 2 o f 3 OpCertClassWorksheet
. rev 5 (10/9/03 )

## Wastewate rSyste m Classificatio n Workshee t

(4 ) Effluen t Permi t Requiremen t Point s (Chec k a s applicable) : • Minimu m o f secondary effluen t limitation s fo rBO D and/o rTS S 2 point s • Minimu m o f 2 0 mg/ L BO D and/o rTota l Suspende d Solid s 3 point s [X] Minimu m o f 1 0 mg/ L BO D and/o rTota l Suspende d Solid s 4 point s • Minimu m o f 5 mg/ L BO D and/o rTota l Suspende d Solid s 5 point s [X] Effluen t limitation s fo reffluen t oxyge n 1 poin t Poin t subtota l 5 (5 ) Variatio n i n Ra wWast e Points . ( 6 point s maximum ) Point s i n thi s category wil l b e awarde d onl y whe n condition s ar e extrem e t o th e exten t tha t operatio n an d handlin g procedur e change s ar e neede d t o adequatel y trea t wast e du e t o variatio n o f ra w wast e • Recurrin g deviation s o rexcessiv e variation s 100 % t o 200 % 2 point s • Recurrin g deviation s o rexcessiv e variation s o f mor e tha n 200 % o r conveyanc e an d treatmen t o f industria l waste s b y Pretreatmen t progra m 4 point s [E l Septag e o rothe rhaule d wast e (contro l and/o rpreliminary treatment ) 2 point s Poin t subtota l 2 (6 ) Samplin g an d Laborator y Testin g Point s (chec k a s applicabl e - maximu m 1 1 points )
• Sampl e fo rBOD , Tota l Suspende d Solid s performe d b y outsid e la b 2 point s IE ] BO D o rTota l Suspende d Solid s analysi s performe d at treatmen t plan t 4 point s • Bacteriologica l analysi s performe d by outsid e la b 1 poin t IE ] Bacteriologica l analysi s performe d at WW T plan t la b 2 point s • Nutrient , Heav

y Metal s o rOrganic s analysi s performe d by outsid e la b 3 point s [E l Nutrient , Heav

y Metal s o rOrganic s analysi s performe d a t WW T plan t 5 point s Poin t subtota l Ij
. (7 ) Point s Fo r Othe r Complexitie s No t Reflecte d Above : (se e OA R 340-04 9 0020(4 ) & (5) )
• Odo rContro l ( 2 point s maximum ) 1 t o 2 point s IE l Standb y Powe rUnit s @ 1 poin t • Solid s Compostin g o rLan d Application of Biosolid s 1 0 point s • Alkalin e Stabilizatio n ( 3 point s maximum ) 2 t o 3 point s [E 3 Othe rEffluen t Limit s [ammonia , CI2 , temp, , etc . (lis t o rattac h list) 1 @ 1 poin t IE l Pond(s ) (advance d treatmen t polishin g o rirrigatio n holding ) 2 point s G Effluen t Lan d Disposa l - Evaporatio n (surfac e o rsubsurface ) 2 t o 4 point s IE l Effluen t direc t Reus e o rRecycl e 6 point s IE l SCAD A o rsimila rfo rdat a (limite d t o extensiv e tota l proces s operation ) 2 t o 6 point s • Chemical/Physica l advance d wast e treatmen t followin g secondary 1 0 point s • Chemical/Physica l advance d wast e treatmen t w/o secondary 1 5 point s • Biologica l o rChemical/Biologica l advance d wast e treatmen t 1 2 point s • Revers e Osmosis , Electro-dialysi s o rMembran e Filtratio n technique s 1 5 point s • Othe rcomplexitie s (lis t o rattac h list) : Poin t subtota l j_ 4 Tota l Point s Pag e 3 3 2 

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A Offic e o f Water , Washingto n D.C. ) Attachmen t # 9 INPU T 

### ' Lowe r p H - 1 . DILUTIO N FACTOR A T MIXIN G ZON E BOUNDAR Y 1
. UPSTREAM/BACKGROUN D CHARACTERISTIC S Temperatur

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. EFFLUEN

T CHARACTERISTIC

S Temperature (de g C) : pH : Alkalinity (m g CaC03/L) : OUTPU T •: • • ' , 1
. IONIZATIO N CONSTANT S Upstream/Backgroun d pKa : Effluen t pKa : 2
. IONIZATIO N FRACTION S Upstream/Backgroun d Ionizatio n Fraction : Effluen t Ionizatio n Fraction : 3
. TOTA L INORGANI C CARBO N

, Upstream/Backgroun d Tota l Inorgani c Carbo n (m g CaC O Effluen t Tota l Inorgani c Carbo n (m g CaC03/L) : 4
. CONDITION S A

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