### Pag e 1 o f 2 9 

# ^3 . DE Q Stat e 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 

# Orego n Departmen t

o f Environmenta l Quality Northwes t Region 2020 S W 4 t h

### Ave. , Suit

e 40 0 Portland , O

R9720 1 (503 ) 229-526 3

Permittee : Existin g Permi t Information : Sourc e Contact : Sourc e Location : LLI D Receivin g Stream Propose d Action : Sourc e Category Permi tWriter : Tri-Cit y Servic e Distric t 15 0 Beavercree k

Rd , Suit e 430 , Orego n City , O R9704 5 Fil e Number : 8970 0 PermitNumber:10116 8 Expiratio n Date : 4/15/201 6 EP A Referenc e Number : OR-003125 9 Dou g Harbaug h (503 ) 557-280 2 Wastewate r

Qualit y Manager 1594 1 Agne s Avenu e Orego n City , Orego n 9704 5 1227618456580-25.5 D Willamett e Rive r Permi t Renewa l Applicatio n Number : 99152 8 Dat e Received : 1/29/199 8 NPDE S Majo r

Domesti c Etsegene t Belete Wate r Qualit y Specialis t

## Pag e 2 o f 2 9 Tabl e of Content s 1. 0 Introductio n 3 2. 0 Facilit y descriptio n 3 2. 1 Genera l 3 2. 2 Wastewate r

Treatmen t

5 2. 3 Change s i n Operatio n 7 2. 4 Groundwate r

Issue s 8 2. 5 Stor mWate r 8 2. 6 Outfall s 8 2. 7 Industria l Pretreatmen t 8 2.8Biosolid s 9 2. 9 Inflo w an dInfiltratio n (I/I ) 1 0 

## 3. 0 Permi t

Histor y 1 0 3. 1 Complianc e histor

y 1 1 

## 4. 0 Receivin g Wate r

1 2 4. 1 Receivin g Strea

mWate r Quality 1 3 4. 2 Mixin g Zon e Analysi s 1 4 4. 3 Environmenta l Mappin g 1 5 

## 5. 0 Permi t

limitation s 1 5 5. 1 Permi t

Limit s 1 5 5. 2 Wate r Quality-Base dEffluen t

Limit s 1 6 5. 3 Whol e Effluent

Toxicit y : 2 1 5. 4 Antidegradatio n 2 1 

## 6. 0 Permi t

Draf t Discussio n 2 2 6. 1 Fac e Pag e 2 2 6. 2 Schedul e A , Waste Discharg e Limitations . 2 2 6. 3 Schedul e B —Minimu mMonitorin g an dReportin g Requirement s 2 2 6. 4 Schedul e C-Complianc e Schedule s andCondition s 2 2 6. 5 Schedul e D - Specia l Condition s ..2 3 6. 6 Schedul e E , Pretreatmen t ProgramActivitie s ..2 3 6. 7 Schedul e F,NPDE S Genera l Condition s 2 3 6. 8 Permi t

Processing/Publi c Comment/Appea l Proces s -.,2 4 Appendi x A - Anti-degradatio n workshee t 2 5 Appendi x B (1&2)-Reasonabl e Potentia l Analyse s 2 6

### Pag e 3 o f 2 9 1. 0 INTRODUCTIO N Th e existin g Nationa l Pollutan t Discharg e Eliminatio n Syste m(NPDES ) Permi t expire do n Jul y 31 , 1998 . Th e Departmen t receive drenewa l applicatio n numbe r 99152 8 fro

mTri-Cit y Servic e Distric t for th e Tri-City Wast e Pollutio n Contro l Plan t (Tri-Cit y WPCP ) o n January 29 , 1998 . A s thi s renewa l applicatio n wa s submitte dt o th e Departmen t i n atimel y manne r

prio r t o th e expiratio n dat e o f

th e permit , th e permi t

ha s bee n administrativel y extende dunti l fina l actio n i s take n o n th e renewa l applicatio n t o issu e th e ne w permi t a s pe r OA R340-045-0040 . Thi s permi t

evaluatio n report

describe s th e basi s and methodolog y use di n developin g th e permit . Th e permi t

i s divide dint o several sections : Schedul e A - Wast e discharg e limitation s Schedul e B - Minimu mmonitorin g an d report requirement s Schedul e C - Complianc e Schedul e Schedul e D - Specia l condition s Schedul e E - Pretreatmen t condition s Schedul e F - Genera l condition s Th e Federa l Wate r

Pollutio n Contro l Ac t

o f 197 2 and subsequen t

amendment s requir e aNPDE S permi t for th e discharg e o f

wastewate r

t o surfac e waters . Furthermore , Orego n Revise dStatute s (ORS ) 468B.05 0 als o requir e adischarge r b e grante dapermi t

for th e discharg e o f

wastewate r

t o surfac e waters . Thi s propose dpermi t actio n b y th e Departmen t complie s wit

h bot h federal and stat e requirements . Th e propose dpermi t

contain s th e followin g substantiv e change s fromth e previou s permit . • Schedul e A include s mor e stringen t effluen t limit s for

CBOD 5 an dTSS , an d an interi m limi t for ammonia . I t

als o include s condition s an d limitation s regardin g Recycle dWate r Use . • Schedul e B ha s Priority Pollutan t Sca n an d Bioassa y testin g requirement s whic h ar e par t o f requirement s o f

EP A Permi t

applicatio n for

m2A . I t als o contain s temperatur e monitoring , an dU V intensity monitorin g fo r th e Membran e Bio-Reacto r (MBR ) treatmen t system . • Schedul e D include s Whol e Effluent Toxicity Testin g condition s that hav e bee n revise d sinc e th e las t

permit , Biosolid s managemen t condition s and Recycle dWate r Us e conditions . • Schedul e E ha s Pretreatmen t conditio n tha

t ha s bee n revise dsinc e th e las t permit . • Schedul e F o f

th e propose dpermi t

include s th e lates t

edition , edite db y th e Departmen t i n Septembe r

2009 . 

### 2. 0 FACILIT Y DESCRIPTIO N 2. 1 Genera l Tri-City Servic e Distric t

operate s th e Tri-City WPC P locate di n Orego n City , Oregon . Wastewater i s treate danddischarge dt o th e Willamett e Rive r i n accordanc e wit

h National Pollutan t

Discharg e Eliminatio n Syste m(NPDES ) Permi t No . 101168 . Th e mos t

recen t Permi t fo r th e facilit y i s a modificatio n that

wa s issue don Augus t

1,1997 . Th e permi t

modificatio n expire don Jul y 31 , 1998 .Figure 1 : Facilit y Locatio nPag e 5 o f 2 9 Thi s propose dpermi t

i s arenewa l tha t

include s ne w requirement s for th e we t weathe r desig n o f th e existin g facility . Th e Tri-City Servic e Distric t i s partnere dwit

h Clackama s County Servic e Distric t N o 1 t o expan dth e liqui dtreatmen t capacity . Th e secondar y treatmen t proces s expansio n wa s neede dt o serv e curren t growth an dregiona l capacity needs . Th e permi t provide s fo

r th e di y andwe t weathe r desig n o f th e expande dliqui dtreatmen t capacity . Th e mas s loadlimit s tha t ar e establishe dfo

r th e existin g seasona l flow s ar e no t increase dfo r

th e expande dtreatmen t

capacity . A renewal permi t

i s necessar

y t o discharg e t o stat e water s pursuan t t o provision s o f

OR S 468B.05 0 andth e Federal Clea

n Wate r Act . Th e Department

propose s t o modif

y an drene w th e permit . 

### 2. 2 Wastewate r Treatmen t Th e Tri-City Servic e Distric t own s an doperate s th e Tri-City WPC P whic h i s locate da t 1594 1 S Agne s Avenu e o n th e eas t sid e o f th e Willamett e Rive r

i n th e cit y o f Orego n City . Thi s i s a

n activate dsludg e secondary treatmen t plan t that treat s th e wastewate r

fro mOrego n City , Wes t Linn , Gladston e andsevera l unincorporate darea s o f th e county . Th e facilit

y bega n operatio n i

n 1986 . Mos t

o f th e equipmen t

place di n servic e aroun dthat

tim e i s stil l i n us e today . Variou s pump s wer e adde daroun dth e facility t o improv e solid s handling . Th e plan t wa s operatin g a t

9 5 t o 100 percen t

o f it s desig n capacit y o n averag e wit h maximu mda y loading s reachin g desig n capacity . Th e actual averag e we t weathe r flo w (Novembe r

1 throug h Apri l 30) , for

th e year s 2006-200 9 wa s 11.1 3 MGD . Th e curren t actual averag e di y weathe r flo w (May 1 throug h Octobe r

31 ) for 2006-200 9 wa s 7.0 1 MGD . Th e secondary treatmen t

proces s expansio n i s lease dspac e fo r CCS D #1 t o serv e curren t growt h an dregiona l capacity needs . Thi s capacit y increas e wa s accomplishe db y th e additio n o f ane w paralle l Membran e Bio-Reacto r (MBR ) system . Th e dry seaso n desig n capacity increase dt o 17. 1 MGD . Th e Distric t

complete dstartu p an doperatio n o f th e expande dfacilit

y i n Spring , 2011 . Thi s propose dpermi t

incorporate s th e expansio n o f th e liqui dtreatmen t

capacity . Th e permi t provide s fo r

th e dry an dwe t

weathe r desig n o f th e expande dliqui dtreatmen t capacity . Fo r

thi s expansion , th e summer

andwinter

desig n flo w wil l increas e bu t th e mas s loa

d limit s remai n th e same . Th e concentratio n o f BOD5 , CBOD 5 equivalen t andTS S are reducedfro

m2 0 mg/ L t o 1 0 mg/L . Thes e ne w limit s reflec t th e Willamette basi n treatmen t standard s prescribe di

n Orego n Administrativ e Rule s fo r

period s o f

lo w strea mflo w (OA R340-041-0345(3)(a)(A)) . Percen t remova l i s dependen t

upo n th e averag e monthl y influen t concentration . Mas s loa

dlimit s are waive d whe n th e influent

flow s excee dtwic e th e expande ddr y weathe r desig n flow . Th e curren t

treatmen t plan t consist s o f

th e pre-existin g activate dsludg e treatmen t andth e ne w MB Rtreatmen t

system . Th e tw o treatmen t system s functio n independentl y andeffluent fromth e tw o treatment s i s mixe dbefore discharg e t o th e receivin g stream . Conventional

Activated

Sludge (CAS) Treatment System: Th e CA S treatmen t

plan t i s mad e u p o f

aserie s o f

uni t processes . Eac h uni t

proces s perform s a specifi c functio n t o ai di n th e treatmen t o f th e wastewater . Influent Pump Station Th e wastewate r

enter s th e facility throug h th e influen t pump station . I

n th e influent

pum p station , ther e ar e tw o 5,00 0 gp m(7. 2 MGD ) andthre e 12,50 0 gp m(1 8 MGD) , variabl e frequenc y spee d pumps . Headworks Primary treatmen t

include s th e headwork s an dprimar y ciariflers . Th e headwork s provid e screenin g an dgri t

remova l wher e th e influent i s screene dt o remov e material s wit h four ba r

### Pag e 6 o f 2 9
screens : on e 4f

t wid e (10. 4 MGD ) mechanicall y cleane dbar screen , tw o 7 ft

wid e (2 5 MGD) , mechanicall y cleane dba

r screen s an don e 7 ft

wid e (2 5 MGD ) manuall y cleane dba r screen . Th e mechanica l bar

screen s preven t

rags , plastic , an dmediu man dlarg e debri s fromenterin g th e treatmen t process . Th e screene dmateria l i s conveye dt o ahoppe r wher e i t i s collecte dfo

r disposa l t o asoli dwast e landfill . Onc e th e influen t

flo w passe s th e screen s i t flow s throug h parshal l flumes . Th e parshal l flume s measur e th e amoun t

o f influen t flow . Fro mther e acommo n channe l direct s th e flo w t o th e aerate dgri t

basins . Th e gri t

basin s remov e iner

t particulat e matte r

fromth e screene dra w sewag e t o reduc e abrasiv e wear

on downstreampump s an dequipmen t an dreduc e th e amoun t

o f materia l that settle s i n th e primary , secondary an dsolid s processin g tanks . Gri t i s remove di n tw o 55,02 3 gallo n aerate dgri t

chambers . Th e gri t

settle s t o th e botto mo f

th e gri t chamber s wher e i s i t pumpe da s slurry t o hydrocyclon e de-gritter s an dclassifier s for separatio n fro mth e water . Th e gri t i s washe di

n th e gri t washer s an dremove dfo r disposa l t o asoli dwast e landfill . A septag e receivin g statio n i s als o locate di n th e headwork s screenin g building . Septag e hauler s discharg e septag e into areceivin g vaul t equippe dwit

h abar rack . Septag e i s containe di n th e 10,00 0 gallo n septag e storag e tank . Th e septag e storag e tank i s locate dnex t

t o th e gri t

chamber s buildin g complex . Septag e tan k wast e enter s th e treatmen t syste mafte r

th e influent

pum p statio n prio r t o screenin g i

n th e screenin g approac h channel . Th e screenin g headwork s buildin g i s completel y enclose dandducte dt o odo r contro l equipment . Primary Clarifiers After screening s an dgri t

removal , th e influen t

flow s t o th e primar

y clarifiers . Influent

sluic e gate s t o th e primary clarifier s wer e pu t unde r automati c operatio n thi s pas t summe r t o manag e flow s t o th e primary clarifiers . Th e primar y clarifier s concentrat e th e "settleable " portio n o f th e suspende dsolid s i

n th e wastewater . Si x primary clarifier s provid e condition s whic h allo w solid s i n th e wastewate r

eithe r t o settl e o r

t o float . Settle dsolid s als o calle d"sludge " i s collecte di n th e primar y basin' s dee p sludg e collectio n hoppers , whic h i s the n pumpe dt o th e anaerobi c digester s fo r furthe r processing . Th e scu mthat float s o n th e to p i s collecte dwit h askimme r

an dremove d t o th e anaerobi c digester s a s well . Secondary Treatment Th e activate dsludg e proces s provide s secondary treatmen t t o plan t flow s belo w 2 5 MGD . Th e activate dsludg e proces s remove s suspende danddissolve dorganic s that wer e no t remove di

n th e primar y treatmen t

proces s b y creatin g a n environmen t for micro-organism s t o metaboliz e th e foo di n th e wastewater . Th e secondary treatmen t syste mconsist s o f

four 639,00 0 gallo n aeratio n basin s wit h fine por e diffuser s an da n anoxi c zon e a t

th e fron t en do f eac h basin . I

n Septembe r 2001 , a$ 1 millio n dollar

projec t wa s approve dfor

improvin g th e efficienc y an deffectivenes s i n al l four aeratio n basin s o f

treatmen t facility . Th e anoxi c zon e o f th e aeratio n basi n wa s furthe r divide dint o 3 chamber s whil e keepin g th e aeratio n zon e t o further improv e biologica l nutrien t removal . Dissolve dOxyge n probe s with motorize dbutterfl y valves wer e als o adde dt o provid e automati c oxyge n control . Th e aeratio n basi n create s a n environmen t

for biologica l treatmen t

o f th e wastewater . Th e resul t i s sludg e that

settle s ou t

for separatio n an dremoval i n th e secondary clarifiers . Ther e are tw o 12 0 ft diamete r secondar y clarifier s eac h wit h sid e wate r

depth s o f 1 8 feet . Floatin g scu mfro mth e secondary clarifier s i s collecte dwith askimme r an dremove dt o th e anaerobi c digesters . A hydroge n peroxid e solutio n that feed s directl y t o th e retur n activate dsludg e lin e t o contro l filamentou s bacteri awa s installe di n Apri l 2003 .

### Pag e 7 o f 2 9 Disinfection Th e secondar y effluen t i s disinfecte

dprio r t o discharge . Chlorine dosag e i s controlledb y th e effluen t flo w mete r prior t o th e chlorine contact

basin . Contact

time i s provide

di n th e tw o 274,500 gallon chlorine contact basins , h i 1995 , asodiu

mbisulfit e dechlorination syste

mwas added . Th e treate deffluen

t i s dechlorinatedwit

h sodiu mbisulfit e prior t o discharge . Membrane Bio-Reactor

(MBR) Treatment

System: Th e MB Rfacilit

y i s designe

dto provid

e treatmen t of th e flow s enterin g th e treatmen t plan t i n conjunctio n wit h the CAS system . All flo

w fro mth e MB Rsyste

mi s combine

dwit h th e CA S syste mprio r to discharge . Thi s combine dflo w i s requiredto mee

t the discharg e criteri aof

th e NPDES permit . I

n addition , th e MB Rtreatmen t syste mtreat s to aleve

l tha t will allow th e distributio n of

reclaimedwate

r tha t meets th e curren t reus e requirement s i

n OA R340-055 . Th e MB Rtreatmen

t syste minclude s Fine Screening s Building , Aeration Basins , Blowe r Building , Membran

e Filtration Building an

dUltraviole

t (UV ) Disinfection Building . Primar y effluen t fee dt o th e tw o aeration basin s i s b y gravit y fro mth e fine scree

n buildin g an dflo w i s spli t evenl y betwee n th e tw o basins . Mixe

dliquo r fro mthe aeratio n basin s i s the n transferre

dint o the submerge

dMB Rbasins . Treatedeffluen t fro mth e MB Ri s conveye

dt o the U V disinfection areabefor e discharge . 2, 3 Change s i n Operatio n h i Januar y 2000 , the Tri-Cit

y WPC P startedaccepting flo

w fro mth e Kellog g Cree

k wastewate r treatmen t plan t i n orde r t o reduc e loading to th e Kellog g treatmen t plant , bu t ther e i s n o direc t connection betwee

n th e tw o facilities . Planning an dconstruction schedule s fo

r the Tri-Cit

y WPC P i s discusseda s par

t o f the Kellog g Cree

k Mutua l Agreemen

t an dOrde r (MAO) No . WQ/M-MWR-08-067 . Th e Tri-Cit y WPC P pu t diversion int

o plac e to reduc e load s fo

r th e Kellog g Cree

k wastewate r plant . O n average , 0. 6 MG

D during dr

y weathe r wit h pea k we t weathe r flo w o f abou t 1. 5 MG D wa s pumpe dfro mKellogg . I

n 2009 , followin

g a n upgrad e to th e Clackama s Pum

p Station , th e phas e I diversion project

was placedo

n line . Wit h thi s diversion , flo

w increasedto a

n averag e 1.

5 MG D wit h apea k of 2. 5 MG D during we

t weather . Upo n startu p of th e MB Rsystem , wastewate r fro mthe Kellog g Cree

k treatmen t facilit y ca n b e divertedto the MB Rfacility . A t tha t time , upgrade s t

o th e conventiona

l activatedsludge syste

m wil l begin . Upgrade s will includ e installation of

ne w Mixe dLiquor Suspende dSolid s (MLSS ) recirculation pumps , ne

w aeration diffuser

s an dne w proces s ai

r blowers to hel

p the syste mwit h increasedenergy efficienc

y an dimprove dnitrification/de-nitrification . I n Jul y 2012 , the ne

w diversion pum

p station wit

h th e capacit

y of 2- 4 MG D di y weathe

r flo w an d1 0 MG D of pea k flow will be completed . Upo n completion o

f the MB Rfacilit

y an dthe diversio

n systems , the tota

l increasedflow fro

mth e Kellog g plan

t wil l b e abou t 6- 8 MG D of di y weathe

r flo w wit h pea k flow o f 17. 5 MG D during we

t weather . Tri-Cit y upgradedthe redundancy powe r t o th e facilit

y afte r th e powe r outag e o n Novembe

r 22 , 2009 . During tha

t time , th e 115k

V transmission lin e fel

l int o th e 13k V primar y line s causing bot

h feeders to becom

e de-energized . Following the incident , PG E removedth e double circuit to eliminat e th e preferre

dan dalternat e circuit s bein

g take n ou t b y asingle sourc e event . Ther e remain s tw o commo

n ti e points betwee

n bot h the preferre

dan dalternat e fee d(source ) to Tri City . On e of th e commo

n ti e point s i s dow

n strea mof fuses thu s if

afaul t occurs betwee

n th e switc h an dupstrea mfuses , the preferredan

dalternat e source s to Try-Cit

y will remai

n i n service .Pag e 8 o f 2 9 I n addition , th e expande dMB Rfacility include s astan dalon e generato r tha t wil l provid e powe r t o th e mai n influent

pump an dt o th e MB Rpart o f th e treatment . Thi s wil l provid e treatmen t withou t discharg e o f

untreate deffluent

i f th e tw o mai n powe r

source s t o th e facilit

y fail . 2. 4 Groundwate r Issue s Base do n th e Department' s curren t information , thi s facilit

y ha s alo w potential for

adversel y impactin g groundwater

quality . Therefore , Schedul e D o f th e propose dpermi t

state s that

n o groundwater

evaluation s wil l b e require ddurin g thi s permi t cycle . Th e permi t

als o include s a conditio n i n Schedul e A that prohibit s any advers e impac t on groundwater

quality . 

## 2. 5 StormWate r Stormwate r

discharg e fromth e facilit y i s covere dunde r

th e District' s NPDE S Industria l Stormwate r

Discharg e 1200Z Permi t

(Fil e no . 110122) . 

## 2. 6 Outfall s Th e existin g outfall convey s th e final plant effluen t throug h 1. 1 mile s o f

pipin g t o th e Willamette River . There i s approximatel y 3,14 2 feet o f 72 - inc h pip e betwee n th e chlorin e contac t basin s and th e flo w contro l structure fo r th e outfall . Fro mth e discharg e distributio n bo x there are thre e 40-feet long , 42-inc h diameter

line s tha t discharg e th e final effluen t t o th e Willamette River

a t river mil e 25. 5 usin g th e LLI D referenc e poin t (o r 25. 2 whe n usin g aUSG S topographi c map) . Th e outfall diffuse r consist s o f

thre e (3 ) 42-inc h diameter discharg e port s tha

t discharg e belo w th e surfac e durin g di y weathe r

(lo w rive r

flow ) condition s a t

adept h o f approximatel y 7 feet . Th e diffuse r axi s i s aligne dparalle l t o th e rive r flow , wit h th e diffuse

r port s dischargin g a

t 45 ° relativ e t o th e directio n o f th e river flow . Outfal l inspectio n wa s conducte di n Augus t 201 0 b y Advance dAmerica n Construction , Inc. , andall thre e pipe s wer e free o f

upset s andabnormalities . There wa s n o accumulatio n insid e th e pipes . 

## 2. 7 Industria l Pretreatmen t Th e Tri-City Servic e Distric t implement s a

n industrial pretreatment

progra moriginall y approve dand incorporate dinto th e permi t o n December

21,1983 . Federa

l andstate pretreatmen t

requirements wer e include di

n th e NPDE S permi t

fo r thi s facilit

y whe n th e previou s permi t wa s issued . O n Decembe r

30 , 1996 , Tri-City Servic e Distric t submitte dt o th e Departmen t propose d modification s t o thei r

industria l pretreatmen t

programprocedure s i

n respons e t o finding s o f

th e Department' s Apri l 4 , 1996 , pretreatmen t complianc e inspection . O n Decembe r 4,1998 , th e Tri Cit y Servic e Distric t

provide dpubli c notic e o f th e propose dmodification s o f th e Procedure s Manua l i n accordanc e wit

h requirement s o f

4 0 CF R403.1 8 an d403.11 . Tri-City Servic e Distric t notifie dth e Departmen t

o n Januar y 11,1999 , tha t n o comment s andn o request s fo r publi c hearin g wer e receive dregardin g thes e modifications . I n accordanc e with 4 0 CF R403.11(d) , EP A wa s give n 3 0 day s t o revie w th e modification . Th e final DE Q approval wa s grante do n Marc h 1 , 1999 . Th e Agenc y als o approve dpretreatmen t programmodification s that includ e RCR A notificatio n procedure s an dform s o n Augus t 6 , 1999 , an drevision s t o th e Enforcemen t Respons e Guidanc e o n Novembe r

13,2002 . Thes e modification s t o th e pretreatmen t programar e hereb y incorporate dint o th e NPDE S permi t b y reference . O n Jun e 15,2001 , Tri-City Servic e Distric t receive daNotic e o f

Noncomplianc e SWM/NWR WQ-0 1 -06 6 for

failur e t o furnis h th e Departmen t requeste dinformatio n withi n areasonabl e time , an dfailure t o enforc e it s pretreatmen t progra ma s approve db y th e Department . O n Novembe r 30,2001 , th e Audi t

Report indicate dthat

th e item s i n th e Notic e o f Noncomplianc e wer e satisfactoril y addressed . O n Februar y 2009 , th e Departmen t approve dth e District' s reques t forPag e 9 o f 2 9 Pretreatmen t

ProgramNon-Substantia l Modification , respondin g t o Augus t 200 8 pretreatmen t complianc e audit . Th e Distric t

wil l b e conductin g a

n evaluatio n o f

th e nee dt o revis e thei r

technically-base dlocal limit s withi n 1 8 month s afte

r th e re-issuance o f

thi s NPDE S permit . Th e loca l limit s evaluatio n wil l includ e a n evaluatio n o f

th e headwork s loadin g criteri aan dpossibl e source s o f th e variou s pollutant s bein g evaluated . Th e USEP A revise dth e federa l pretreatmen t

streamlinin g rule s (4 0 CFR§ 403 ) effectiv e Novembe r 14,2005 . Th e Distric t

wil l b e implementin g progra mmodification s t o reflec t

th e voluntar

y and mandator y change s durin g 200 6 whic h wil l resul t i n modification s t o Schedul e E , Pretreatmen t Activities , i

n th e futur e t o incorporate streamlining-relate d changes . 

### 2. 8 Biosolid s Solid s generate di

n th e primar

y clarifier s andsecondar

y clarifie r treatmen t ar e processe dan

dthe n stabilize di n tw o anaerobi c digesters . Th e initial processe s thicke n th e solids . Th e primar y solid s are thickene di n deep hopper s i n th e primar

y clarifier s andth e secondar y solid s are thickene dusin g gravit y bel t thickener s prio r

t o pumpin g t o th e digesters . Polymer s ar e use di n th e thickenin g process . Thickenin g reduce s th e volum e o f th e sludg e adde dt o th e digesters . Tw o fixedcove r 65-f t diamete r digester s andassociate dequipmen t provid e fo r

th e stabilizatio n an ddigestio n o f th e solid s generate di

n th e treatmen t

plant . Th e content s o f

th e digester s ar e mixe dwith pum p mixers . Digester

ga s that i s produce di s utilize di

n a n engin e generato r

producin g u

p t o 250k W o f electrical power . I

t i s anticipate dthat

wit h th e facilit

y expansio n solid s handlin g wil l change . Waste Activate dSludg e (WAS ) stream s o f th e MB Ran dth e conventiona l activate dsludg e system s wil l b e conveye dt o th e gravit y bel t thickener s for

thickening . Th e tw o existin g gravity bel t thickener s wil l b e dedicate dt o eac h proces s stream . Thi s permi t require s monitorin g o f

th e method s use dt o compl y with vecto r

attractio n an dpathoge n reductio n requirements . I t als o require s th e submitta l o f a n annua l summary . Biosolid s mus t

b e manage di

n accordanc e wit

h th e Departmen t

approve dBiosolid s Managemen t Pla n t o ensur e complianc e wit h th e Orego n an dfederal biosolid s regulation s (4 0 CF RPart 503) . Th e Tri-City Servic e Distric t wil l submi t

arevise dbiosolid s managemen t pla n a s par t o f a requiremen t

o f thi s permit . Onc e th e biosolid s management pla n ha s bee n reviewe dandapprove d th e management

pla n wil l b e place don publi c notice . Monitorin g result s for

metal s conten t

i n th e final produc t

t o b e lan dapplie dar e note dbelow . Al l metal s concentration s appear t o b e well belo w EP A pollutan t concentratio n limits . Paramete r Arseni c Cadmiu m Coppe r Lead Mercur y Molybdenu m Nicke l Seleniu m Zin c Concentratio n

(mefks) 2/2/201 0 2.8 3 <9.3 0 48 0 19.1 7 1.1 6 <9.2 0 < 13. 9 4. 3 89 3 Concentratio n

(me/ke ) 8/10/200 9 4.1 0 < 13.4 0 53 5 <26.8 5 0.9 5 < 13.4 2 <20. 1 <6.6 100 0 EP A Pollutan t

Concentratio n Limit s dne/ke ) 4 1 3 9 150 0 30 0 1 7 7 5 42 0 100 280 0Pag e 1 0 o f 2 9 2. 9 Inflo w an d Infiltratio n (I/I ) Tri-City i s aregional sewerag e agency ; th e local collectio n facilitie s are owned , operate dan d maintaine dindividuall y by th e citie s o f Gladstone , Orego n Cit

y andWes t

Linn . Betwee n 198 6 and 199 2 Tri-City , Gladstone , Orego n Cit y andWes t

Liimwen t

thoug h amajor

combine dsewe r separatio n progra

mt o disconnec t

stree t stor mwate r inlet s fro mth e sewer

system . Thi s program reduce dth e pea

k flo w t o th e wastewate r

treatmen t facility ; howeve r

inflo w andinfiltratio n (I/I ) ar e stil l problems . We t Weather Mas s Loa

dIncreas e Tri-City submitte dth e Tri-Cit y Servic e Distric t

Sewerag e Master

Pla n prepare dby WE S an d CH2MHH1 , (Oc t

1998 ) whic h containe dtechnica l memorand adescribin g an dsupportin g th e desig n averag e we t

weathe r flo w andpercen t

removals . Th e Departmen t approve dth e engineerin g stud y whic h supporte dth e chang e i n th e we t weathe r mas s load increas e an dpercen t remova l requirements . I n addition , th e we t

weathe r mas s loa dincreas e i s allowe dprovide dth e facilit y follow s a

n approve dprograman dtim e schedul e for identifyin g an dreducin g inflow . Th e approve dprogra m an dtim e schedul e i s usuall y begu n afte r apermi t modificatio n for

th e mas s loa

dincreas e ha s bee n issued ; however , fo r anumbe r o f years , th e Tri-Cit y Servic e Distric t ha s bee n activel y pursuin g th e reductio n o f infiltratio n an dinflo w (I/I ) t o th e Tri-City WPCP . Betwee n 198 6 an d 1992 , twelv e combine dsewe r overflow s wer e plugge da s part o f amajo r combine dsewe r separatio n project . Th e 199 8 Tri-Cit y Servic e Distric t Sewerag e Maste r

Pla n conducte danalysi s t o identif y sewerag e basin s whic h ar e larg e contributor s t o I/I . Thi s analysi s i s als o presente di n Appendi x C i n th e Maste r Plan technica l report

submitte dt o DE Q i n Marc h 1999 . Thi s analysi s resulte di n recommendation s fo

r selectiv e smok e testin g an dtelevise dinspection s i n local basin s wher e I/ I problem s hav e bee n identified . Thi s permi t renewal include s th e same requiremen t i n Schedul e C i

n order t o receiv e a

n update dprogra

mwit h alook a t where th e progra

man dtim e schedul e i s for continuin g t o identif

y an daddres s reducin g inflow . Th e propose dpermi t

we t weather mas s loa dfo r th e facilit y i s calculate dbase do n th e existin g plant desig n capacity ; averag e desig n we t weather flo w o f 13. 5 MGD . 

## 3. 0 PERMI T HISTOR Y Th e permi t

tha t wa s issue di n Jun e 28,1991 , wa s for apermi t renewal tha

t wa s administrativel y extende dfromJul y 31 , 1988 . Th e permi t wa s issue dwit

h a n expiratio n date o f

May 31,1996 . Th e permi t containe dconcentration , mas s loa dan dpercen t

remova l limit s o f BOD 5 andTS S a s wel l a s permi t limit s fo r feca l coliform , p H andchlorin e residual . Th e 1.5 mg/ L permi t limi t fo r chlorin e residual wa s subjec t

t o modificatio n base dupo n th e result s o f amixin g zon e study . Th e siz e o f th e mixin g zon e wa s describe da s a15 0 foo t radiu s fro mth e poin t

o f discharge . Th e permi t

als o containe daconditio n wit

h higher mas s loa dlimit s fo r BO D andTS S when th e combine dsewer system s cause dth e monthl y averag e flo w goin g into th e treatmen t facilit y t o g o abov e th e averag e desig n dr y weathe r flo w o f 8. 4 MGD . Th e permi t

wa s issue dalon g wit

h aStipulatio n andFinal Order (SFO ) No . WQ-NWR-91-80 . Th e SF O containe darequirement t o complete th e separatio n o f th e remainin g combine dportion s o f th e Orego n Cit

y andGladston e sewag e collectio n systems . Th e 199 1 permi t

wa s appeale dafte

r issuance ; th e appeal for

Tri-City Servic e Distric t

andsi x othe r

partie s wa s settle di n Novembe r

1993 . A n outcome o f

th e appeal wa s arul e chang e i n OA R340-041-012 0 (no w OA R340-041-0061(10) ) t o recogniz e tha t mas s loa dlimit s coul db e base do n awe t weathe r desig n flo w o f

th e treatment

facility . O

n December

10,1993 , th e permi t

wa s issue dwit

h a nPag e 1 1 o f 2 9 expiratio n dat e o f

Jul y 31,199 8 andSF O No . WQ-NWR-91-8 0 wa s supersede db y SF O No . WQMW-NWR-93-108 . O n September

13,1994 , th e permi t

wa s modified , t o incorporate th e result s o f th e mixin g zon e study an dinclud e revise dpermi t limit s fo r chlorin e residual . Th e chlorin e residual permi t limit s are adail y maximu mlimi t

o f 0.0 5 mg/ L andamonthl y averag e limi t o f 0.0 2 mg/L . Th e mixin g zon e wa s redefine da s 30 0 fee

t downstrea

mo f th e poin t o f discharg e wit

h azon e o f

initia l dilutio n o f

3 0 feet downstream . Th e di y seaso n BOD 5 wa s change dt o th e equivalen t o f CBOD 5 . Th e CBOD 5 concentratio n limit s ar e considere dequivalen t t o th e minimu mdesig n criteri afo r BOD 5 specifie d i n OA R340-041 . Th e permi t allowe dfor

th e percen t

removal requirement s t o b e change dupo n reques t andbase don th e approval o f a n engineerin g evaluation . Th e permi t expiratio n remaine dJul y 31,1998 . Tw o pretreatmen t

Permi t Actio n Letter s were issued . A permi t actio n letter

wa s issue di

n Augus t 14 , 1995 , t o incorporate approve dlocal limit s into th e pretreatmen t program . A permi t

actio n letter

wa s issue di n Septembe

r 22 , 1995 , t o incorporate approve dchange s i n th e rule s an dregulation s o f th e pretreatmen t

program . O n Februar

y 27,1997 , afte

r discussion s wit

h th e DEQ , Tri-City Servic e Distric t applie dfo

r a modificatio n o f

th e permi t

t o pu t th e remainin g requiremen t fro mSF O No . WQMW-NWR-94-04 7 into th e permit . O n Augus t 1 , 1997 , th e permi t

wa s modifie dt o includ e aschedul e fo r completin g a basin-wid e evaluatio n o f

alternatives , andt o provid e capacit y a t th e Bolto n pum

p statio n adequate t o accommodate estimate dflow s unde r aon e i n five-year

stor mevent . Tri-Cit

y Servic e Distric t complete dth e other

requirement s i

n SFO No . WQMW-NWR-94-047 . Th e remainin g requirement s relatin g t o th e Bolto n pum

p statio n were transferre dt o th e complianc e schedul e i n Schedul e C an

d SF O No . WQMW-NWR-94-04 7 wa s terminated . Th e permi t limit s remaine dth e sam e a s th e previou s permi t

issue don September

13,1994 . Th e permi t

allowe dfo

r th e percen t

removal requirement s t o b e change dupo n reques t an dbase do n th e approval o f a n engineerin g evaluation . Th e permi t

expiratio n remaine dJul y 31,1998 . Thi s permi t

actio n i s arenewa l o f

th e permi t

that wa s issue do n Augus t

1,1997 . Th e propose d permi t regulate s CBOD 5 an dTS S concentration s yea r round . Th e propose dpermi t include s modification s fo

r th e di y weathe r

concentratio n o f

CBOD 5 an dTS S base don Basi n Standard . Percen t remova l efficiencie s t o reflec t

th e dilut e we t

weathe r flows are proposed . Mas s loa dlimit s wil l b e waive dwhe n influent flow s excee dtwic e th e desig n averag e di y weather flow. Th e bacteri a standardwa s change di n 199 6 fro mfeca l colifor mt o __ . coli. Thi s permi t

renewal include s bacteri a limit s fo r E. coli. Th e propose dpermi t

incorporate s th e expansio n o f th e liqui dtreatmen t

capacity . Th e secondary treatmen t proces s expansio n i s neede dt o serv e curren t growth an dregiona l capacity needs . Th e necessary capacit y increas e i s accommodate dthroug h addition o f th e MB Rfacilit

y operatin g i

n paralle l t o th e conventiona l activate dsludg e system . Th e permi t provide s fo r

th e dr y andwe t weathe r desig n o f th e expande dliqui dtreatmen t capacity . Fo r

thi s expansion , th e summe r an d winter desig n flo w wil l increas e but th e mas s loa

dlimit s remai n th e same . 

## 3. 1 Complianc e history Th e permi t

that wa s issue do n Augus t

1 , 199 7 containe dth e remainin g requirement s o f Stipulate d Fina l Orde r

No . WQMW-NWR-94-047. Th e remainin g requirement s wer e place dint o Schedul e C conditio n No . 3.a . throug h c . i n th e permit .Pag e 1 2 o f 2 9

• Conditio n Nos . 3.a . an d3.b . wer e satisfie dupo n th e receip t o f th e Bolto n Pum

p Statio n repor t o n Septembe r

1 , 1998 . A Novembe r

30 , 199 8 lette r

fromDE Q t o Tri-City Servic e Distric t refer s t o th e revie w o f

th e report . • Conditio n No . 3.c . wa s satisfie dwhe n ane w gravit y intercepto r

wa s place di n operatio n o n Decembe r

14,2001 . Th e preliminary desig n report date dMarc h 29,2001 , contain s th e detaile ddesig n calculation s for th e projec t

t o sho w tha t

th e pump statio n i s adequat e t o accommodat e estimate dflows unde r aon e i n five-year, 2 4 hou r

stormevent . Notic e o f Noncomplianc e (WQ/D-NWR-02-053 ) wa s issue do n Septembe r 3,2002 , for exceedin g th e mas s loadlimit s fo r TS S andCBOD 5 . Notic e o f Violatio n an dAssessmen t o f Civi l Penalty No . (WQ/M-NWR-02-172 ) wa s writte n fo r sewag e spill s that

occurre do n Augus t

2,2002 , an dNovembe r

6,2002 . Notic e o f Noncomplianc e (WQ/D NWR-03-0048 ) wa s writte n fo r exceedin g th e weekl y fecal coliformgeometri c mea n i n Januar y 2003 . Notic e o f Noncomplianc e (WQ/D NWR-04-0080 ) wa s writte n on Jun e 28 , 2004 , fo r exceedin g th e mas s loa

dlimi t for TSS . Warnin g Lette r

(WL-NWR-WQ-2005-0070 ) wa s writte n on Augus t 24,2005 , fo

r alat e stormwate r

samplin g annua l report . Notic e o f Violatio n (NWR-WQ-06-169 ) wa s writte n becaus e durin g th e wee k o f Octobe r 8 , 2006 , th e facilit y faile dt o monito r

fo r tota l kejldah l nitroge n an dtota l phosphorus . Warnin g Lette r

(WL-NWR-WQ-08-0107 ) wa s writte n o n Octobe r 9,2009 , fo r

constructio n commencin g withou t

Departmen t

approva l i n th e sprin g o f 2009 . Notic e o f Violatio n an dAssessmen t o f Civi l Penalt y No . (WQ/M-NWR-09-041 ) wa s issue do n Marc h 31,2009 , for

multipl e exceedance s o f

CBOD 5 an dTS S values betwee n Decembe r 28 , 200 8 an dJanuary 3 , 2009 . Warnin g Lette r

(NWR-WQ-09-0147 ) wa s writte n for sewag e spill s that

occurre do n Novembe r 22 , 2009 , du e t o primar y an dsecondary power failure . Thi s proble mha s sinc e been correcte dan d th e facility currentl y ha s tripl e powe r redundancy . Notic e o f Noncomplianc e (NWR - WQ-10-0067 ) wa s issue do n Ma y 10,2010 , for exceedin g th e mas s loa dlimit s for

CBOD 5 . 

## 4. 0 RECEIVIN G WATE R Th e Tri-City WPC P discharge s t o th e Willamett e River . Th e wate r qualit y standard s fo

r all water bodie s (Orego n Administrativ e Rule s 340-41 ) andspecificall y th e Willamette Basi n (Orego n Administrativ e Rule s 340-4 1 -0345 ) were develope dt o protec t th e beneficia

l use s fo r th e basin . Th e designate dbeneficial use s o f th e Willamett e Rive r

Basin fro mth e mout

h t o Willamette Fall s are liste dbelow : • Privat e Domesti c Wate r Suppl y • Publi c Domesti c Wate r Suppl y « Industria l Wate r

Suppl yPag e 1 3 o f 2 9 Irrigatio n Livestoc k Waterin g Fis h & Aquati c Lif

e Wildlif e & Huntin g Fishin g Boatin g Wate r Contac t Recreatio n Aestheti c Quality Hydr o Powe r Commercia l Navigatio n & Transportatio n 

### 4. 1 Receivin g Strea m Wate r Qualit y Th e Departmen t

i s require dby th e Federal Clea n Water Act , Sectio n 303(d ) t o identif y all wate r bodie s i n Orego n tha

t d o no t mee t wate r quality standards . Onc e identified , th e strea msegment s are place don th e DEQ' s "303(d ) list" . Thi s listin g mean s tha t th e standard s tha

t protec t th e mos t sensitiv e beneficia

l use s o f th e wate r are no t bein g me t

andth e Department

i s require dt o establis h a pla n wit h goal s andpollutio n contro l target s for improvin g wate r

quality . Th e "303(d ) list " provide s away t o identif y an dprioritiz e wate r

qualit y problems . Th e lis t

als o serve s a s aguid e fo

r developin g an dimplementin g watershe dpollutio n reductio n plan s t o achiev e wate r qualit y standard s an dprotec t

beneficia l uses . Fro mriver

mil e 24. 8 t o 54.8 , th e Willamette Rive r i s liste dfo r

th e followin g parameter's : Paramete r Toxic s
Iro n Biologica l Criteri a C riteria/Stan d ar d Fis h Tissue-DD T an dDDT'Metabolit e (DDE ) Fis h Tissue-PC B Fis h Tissu e —Aldri

n Fis h Tissu e -Dieldri n RM 3 4 an d4 8 Tabl e 2 0 > 30 0 ug/L drinkin g wate r Skeleta l deformitie s i n squawfis h Seaso n Yea r Roun d Yea r Roun d Yea r Roun d Yea r Roun d Year Roun d N A A Tota l Maximu mDail y Loa d(TMDL ) for th e Willamette Rive r

for temperature , bacteri aan d mercury wa s approve db y bot h DE Q an dEP A i n Septembe r 2006 . h i th e TMD L fo

r bacteria , individual municipal discharge s are require dt o compl y wit h th e water

quality standar

dfo r E. coli. A permi t limi t fo r E. coli bacteri aha s been se t andmeet s thi s requirement . A separat e Departmen t Orde r wil l b e writte n fo r

mercur y sampling . Th e facilitie s include di n th e Departmen t

Orde r wil l b e require dt o follo w thos e samplin g an danalysi s requirements . Th e temperatur e thermal loa d limit s ar e include da s part o f thi s permit . Toxic s suc h a s Aldrin , Dieldrin , PCB , DD E an dDD T ar e no t know n t o b e introduce dt o th e domesti c wastewate r

treatmen t facility throug h productio n o r manufacturin g processes . The y ar e no t considere dt o b e presen t

abov e trac e backgroun dlevels . Skeleta l deformitie s i n fis h i s aseparat e study , thi s sourc e ha s no t bee n evaluate dfo

r it s contributio n t o skeleta l deformitie s i n squawfish . A recen t

stud y entitle dEnvironmenta l Stresse s an dFis h Deformitie s i

n th e Willamett e Rive r

Projec t Statu s Repor

t (Decembe r

2003 ) conducte d b y Department s o f

Environmenta l an dMolecular Toxicology , Microbiology , an dFisherie s and Wildlife , Orego n Stat e University , Corvallis , Oregon , indicate s that parasite s ar e majo r contributor s t o hig h prevalenc e o f skeleta l deformitie s i

n fish fromth e Newber g Poo l sectio n o f th e Willamett e River .Pag e 1 4 o f 2 9 Iro n i s liste da s exceedin g th e drinkin g wate r standard s becaus e iro n an dmanganes e can b e aestheticall y unappealin g i n drinkin g water . RP A show s tha t ther e i s n o reasonabl e potentia l for iro n i n th e Tri-City effluent discharge . 4. 2 Mixin g Zon e Analysi s Federa l regulation s (4 0 CF R131.13 ) allo w fo r th e us e o f

mixin g zones , als o know n a s "allocate d impac t zones" . Thes e ar e smal l area s aroun dadischarg e wher e wate r quality standard s may b e suspended . Applicatio n o f mixin g zone s mus t

ensur e acut e toxicit y t o driftin g organism s i s prevente dan dth e integrity o f th e waterbod y a s awhol e i s no t impaired . EPA doe s no t

hav e specifi c regulation s pertainin g t o mixin g zones . Eac h stat e may adop t it s ow n mixin g zon e regulation s tha t

ar e subjec t

t o revie w an dapproval b y 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 a t th e en do f

th e pipe . OA R340 - 041-0053(1 ) provide s tha t th e Departmen t

may suspen dal l o r

part o f th e wate r quality standard s i n adesignate dportio n o f th e receivin g wate r

t o serv e a s azon e o f

dilutio n fo

r waste s an d receivin g water s t

o mi x thoroughly . Th e Departmen t

ha s develope dmixin g zon e regulation s an dpolic y base di n par t o n th e acut e an d chroni c aquati c lif

e criteria . Base do

n EP A guidanc e an dth e Department' s mixin g zon e regulations , tw o mixin g zone s may b e develope dfor eac h discharg e that

reflec t acut e andchroni c effects : 1 ) Th e acut e mixin g zone , als o know n a s th e "zon e o f initia l dilution " (ZID), an d2 ) th e chroni c mixin g zone , usuall y referre dt o a s "th e mixin g zone" . Acut e criteri aar e suspende d withi n th e ZI D bu t

it i s designe dt o preven t

lethality t o organism s passin g throug h th e ZID . Chroni c criteri aare suspende dwithi n th e mixin g zon e an dar e designe dt o protec t th e integrity o f th e entir e wate r

body 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 beneficia l use s o f th e receivin g stream , locatio n o f

othe r discharge s nearby , locatio n o f drinkin g wate r

intakes , an dothe r considerations . Mor e specifi c guidanc e i s availabl e fromEP A regardin g criteri ause di n appropriatel y sizin g aZID . Primaril y th e ZI D mus t b e designe dt o preven t

lethalit y t o driftin g organisms . Th e firs t mixin g zon e stud y entitle d'Mixin g Zon e Evaluatio n for TCS D Outfall o f

th e Tri-City WPCP ' wa s conducte dfor Tri-Cit y Servic e Distric t

by Liberi e Environmental Associate s i n October 2001 . Th e CORMDC

2 mode l wa s use dt o simulate 7Q1 0 critical lo w rive r flo w o f 543 0 CF S base d o n th e USG S statistical flow dat afro mWilsonville . Th e modelin g wa s refine dusin g datafro mth e Tri-City WPC P Mixin g Zon e Fiel dStud y (Volume 2 o f

3) . Th e fieldstud y include s datatha t wa s collecte ddurin g lo w rive r

flow s i n Augus t 2001 . Th e fieldstudy result s wer e adjuste dt o critica l condition s t o simulate th e mixin g zone . h i October

o f 200 7 th e Distric t

provide dadditiona

l velocit y measuremen t

a t th e Tri-Cit

y outfal l sit e i n aTeciniica

l Mem o title d"Curren t

Velocit y Measuremen t

a t th e Tri-City andKellog g Creek WPC P Outfall Sites-CIackama s WES" . h i May 2010 , thi s dat awa s use di n conjunctio n wit

h th e 200 1 dat ai

n CORMI X v6. 0 modelin g t o predic t plume trajector

y an ddilution . A ful

l leve l 3 stud y wil l b e complete di n lat e summer or earl y fall o f 2010 . Th e allowabl e mixin g zon e (RMZ ) i s that portio n o f

th e Willamette Rive

r whic h extend s 30 0 fee

t downstrea

mo f th e point o f discharge . Th e zon e o f

initia l dilutio n (ZID ) i s tha

t portio n o f th e Willamette River

whic h extend s 3 0 fee

t downstrea

mo f th e discharg e point . At

th e zon e o f initia l dilutio n an da

t th e edg e o f

th e mixin g zone , adilutio n wa s derive dfo r th e facilit y expansio n fro

mth e mixin g zon e stud

y data . A facilit

y flo w o f 17. 1 wa s substitute di n th e equations . Dilutio n a t th e edg e o f

mixin g zon e i s 13. 9 an dth e dilutio n a t th e zon e o f

initia l dilutio n i s 3.3 .

### Pag e 1 5 o f 2 9 

## 4. 3 Environmenta l Mappin g Environmenta

l Mappin g wa s completeda

s par t of the mixing zon

e stud y complete di n July of 2010 . Th e stud y indicate s tha

t th e Willamett

e Rive r outfal l structur e i s locate dadjacen t t o th e Willamett e Rive r a t approximatel

y rive r mile 2 5 o n th e righ t shoreline , jus t

upstrea mfro mwher e Clackama s Rive

r joins . Ther

e ar e n o commercia

l / recreationa

l shellfish o

r cold wate r refugi a area s nea r th e Tri-Cit

y outfal l location . Fish us e fo

r th e area , including a

t the Clackamas confluenc e ar

e Summe r Steelhea d an dCoh o Salmo n migration ; Winte

r Steelhea drearing an

d Chinoo k Salmo n rearin g an

dspawning . Bal

d Eagl e an dN . SpottedOw

l ar e the tw o possibl e threatene do

r endangere dspecie s tha

t ma y have presence , habita

t o r migration pathway s nea

r th e outfal l location . Fishing occur s i

n the Willamett

e an dClackamas River . Orego

n Departmen

t of Huma n Service s fishin g advisorie s fo

r th e mai n ste mof th e Willamett

e Rive r continue . Th

e Departmen

t of Huma n Service s recommend s tha t consumers limit

thei r consumption of

residen t fis h fro mthe Willamett e River . Thi s advisor

y doe s no t relat e to migrating ocea

n fish suc h a s salmon , steelhead , sha do r lampreys . Fis h us e the mout h of the Clackama s Rive

r a s aholdin

g area . Th e fish ar e presen t ther e fo r alonge r perio dof tim e befor e continuing thei

r migration . Ther

e i s afishin

g spot tha t i s dubbe d'th e garbag e hole ' whic

h i s locatedabove th e outfall . Th e 'garbag e hole ' i s a deepe r are a(slightl

y deepe r tha n 1 5 feet ) i n th e Willamett

e Rive r tha t fish ten dt o holdu p in . Th e sid e of th e rive r tha t the outfal l i s locate dha s bee n alteredb y rip ra p an da s suc h i s faste r moving th e are atha

t fish tendto move righ

t through . 

## 5. 0 PERMI T LIMITATION S Two categorie s of

effluen t limitation s exis t

fo r NPDE S permits : 1 ) Technolog y base deffluen t limits , an d2 ) Wate r qualit y base deffluen t limits . Technology base

deffluen t limits ar e developed b y applying th e nationa

l effluen t limitation guideline s (ELGs ) establishedb y EP A fo r specific industria l categories . Technolog

y base deffluen t limits wer

e establishedto requir

e aminimu

m leve l o f treatmen t fo r industria l o r municipa l source s using availabl e technology . Wate r qualit y base deffluen t limit s ar e designe dto be protectiv e o f

the beneficia

l use s of the receiving wate

r an dar e independen

t of 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 limits . Thes e ma

y be technology-basedlimits , wate r quality base dlimits , o r limit s base

do n best professiona

l judgment . Whe

n renewing apermit , the most stringen t of technology base

do r wate r qualit y base dlimits apply . 

## 5. 1 Permi t Limit s TreatedEffluen

t Outfal l 00 1 (Wastewate

r treatmen t facilit y discharge ) (1 ) Ma y 1 - Octobe r 31 : Paramete r CBOD 5 TS S Averag e Effluen t Concentration s Monthl y Weekl y 1 0 mg/ L 1 5 mg/

L 1 0 mg/ L 1 5 mg/L Monthly *

Averag e lb/da y 105 0 140 0 Weekly *

Averag e ib/day 175 0 210 0 Daily *

Maximu m lb s 210 0 280 0 (2 ) Novembe r

1-Apri l 30 : Paramete r CBOD 5 TS S Averag e Effluen t Concentration s Monthl y Weekl y 2 5 mg/ L 4 0 mg/L 3 0 mg/ L 4 5 mg/ L Monthly *

Averag e lb/da y 280 0 340 0 Weekly *

Averag e Ib/da y 450 0 510 0 Daily *

Maximu m lb s 560 0 680 0Pag e 1 6 o f 2 9
* Th e winte r

mas s loa dlimit s ar e base dupo n averag e we t weathe r desig n flo w prio r

t o expansio n (13. 5 MGD) . Th e dail y mas s loadlimi t i s suspende do n an y day i n whic h th e flow int o th e treatmen t facilit y exceed s 23. 8 MG D (twic e th e desig n averag e di y weathe r flow). 

## (_ i Othe r parameter s (year-round ) E. coli Bacteri a p H BOD 5 andTS S Remova l Efficienc y Tota l Chlorin e Residua l Ammoni a(Interi mlimit ) Limitation s Shal l no t excee d12 6 organism s pe r 10 0 m L monthl y geometri c mean . N o singl e sampl e shal l excee d40 6 organism s pe r

100 mL . Shal l b e withi n th e rang e o f 6. 0 - 9. 0 Shal l no t b e les s tha n 85 % base do n amonthl y averag e for

BOD 5 ) an dshal l no t

b e les s tha n 85 % base do n amonthl y averag e for TSS . Shal l no t excee dan averag e monthl y concentratio n o f 0.0 2 mg/ L an damaximu mdail y concentratio n o f 0.0 4 mg/ L Shal l no t excee damonthl y averag e o f 1 5 mg/ L BOD^/CBODsan d TS S concentratio n an dmas s limit s fo r secondary treatmen t

expansio n After th e expansion , th e facility wil l hav e o f averag e di y weathe r

desig n flow o f

11. 9 MG D an d we t weathe r desig n flow o f

17. 1 MGD . Th e BOD 5 an dTS S mas s load limit s wil l remai n th e sam e a s th e previou s permit . Th e monthl y concentratio n limi t o f BOD 5 an dCBOD 5 whic h i s th e equivalen t

o f BOD 5 wil l b e reduce dt o 1 0 mg/L ; an dth e TS S monthl y concentratio n limi t wil l b e reduce dt o 1 0 mg/

L base do n th e Willamett e basi n standard . BOD and TSS Percent Removal Efficiency BO D i s require dt o mee t

8 5 percen t

remova l efficiency . Th e federal secondary treatmen t regulation s allo w fo r

exception s t o th e 8 5 percen t removal efficienc y limitatio n for wastewate r treatmen t facilitie s with aseparat e sewe r syste munde r

4 0 CFRPart

133.103(d) . T o qualif

y for thi s exception , ther e ar e thre e condition s t o meet . DE Q determine dtha t th e Tri-City WPC P qualifie dfo

r exception s base dupo n informatio n provide dt o th e departmen t i n 1998 . Upo n furthe r consideration , DE Q determine dtha t th e Tri-City WPC P doe s no t mee t th e thre e condition s necessar

y t o allo w exception s t o th e BO D andTS S percen t remova l efficiency . Namely , th e Tri-City WPC P ha s consistentl y me t th e 85 % remova l requiremen t i n recen t years . Therefore , th e propose dpermi t require s 85 % remova l o f BO D an dTSS . 5. 2 Wate r Quality-Base d Effluen tLimit s Reasonable Potential

Analysis Th e Departmen t

perform s an analysi s t o determin e i f ther e i s areasonabl e potential t o caus e o r contribut e t o violation s o f instrea mwate r

quality criteria . Th e Departmen t ha s adopte dEPA' s recommende dmethodolog y fo r performin g areasonabl e potentia l analysi s (RPA) . Thi s methodolog y wa s develope dprimaril y fo r acut e andchroni c criteri abu t can b e adapte dt o othe r criteri abase don different frequencie s an ddurations . Thi s RPA take s int o accoun t effluent variability , availabl e dilutio n (i f applicable) , an dreceivin g strea mwate r quality . Th e RP A fo

r specifi c parameter s ar e discusse dbelow . I n accordanc e wit

h DEQ' s "Interna l Managemen t Directiv e for

Reasonabl e Potentia l Analysi s for Toxi c Pollutants " (Septembe r 2005) , domesti c source s lik e Tri-City Servic e Distric t with adi y weathe r desig n flo w greate r

tha n 1. 0 MG D mus t

b e characterize dfor

chlorin e an dammoni aa s well a s other

potentiall y toxi c parameter s identifie di n thei r renewa l application . A summary o f th e RP A result s base do n th e mos t recen t mixin g zon e stud y i s provide da s an attachment . Th ePag e 1 7 o f 2 9 RP A spreadshee t

usin g dat afro mth e mos t recen t permi t cycl e indicate s that

ther e i s n o reasonabl e potentia l for

toxi c pollutant s t o caus e o r contribut e t o a

n excursio n abov e Stat e wate r qualit y standards . However , th e reasonabl e potentia l analysi s indicate s that th e existin g facility ha s th e potentia l t o caus e o r contribut e t o aviolatio n o f wate r quality standard s fo r

ammonia . Expansio n o f

th e liqui dtreatmen t

capacity : Th e sam e dat awa s use dt o evaluat e th e expande d treatmen t capacit y usin g adilutio n o f 3. 3 a t th e zon e o f

initia l dilutio n an d13. 9 a t th e edg e o f

th e mixin g zone . Th e reasonabl e potentia l analysi s indicate s tha t th e existin g facilit

y ha s th e reasonabl e potentia l t o caus e o r contribut e t o aviolatio n o f wate r qualit y standard s fo r

ammonia . Ammoni a Th e Reasonabl e Potentia l Analyse s show s tha t th e facility' s discharg e ammoni aconcentratio n exceed s th e chroni c wate r qualit y standar dan dha s areasonabl e potentia l t o pollute . Th e previou s permi t hadn o permi t

limi t fo r ammoni ai

n th e discharge , an dth e Tri-Cit y WPC P canno t immediatel y compl y wit

h th e effluent

limi t that wa s calculate dbase do n th e RPA . Therefore , a Mutua l Agreemen t

an dOrde r

(MAO ) ha s bee n develope dtha t include s arequiremen t

for Tri-Cit y WPC P t o reduc e th e ammoni aconcentratio n t o th e leve l o f complianc e b y providin g additiona l treatmen t throug h process , o r

re-designin g th e outfal l t o improv e th e dilutio n i n th e receivin g stream . Th e MA O include s complianc e date s for an administrativ e an dengineerin g feasibility study , completio n o f

construction/start

up , an dinteri meffluen t

limi t fo r ammoni ai

n th e effluent . I f th e facility choose s t o redesig n th e outfall , with outfal l improvemen t andbette r

diffusion , th e dilutio n associate dwit

h th e mixin g that

occur s withi n th e zon e o f initia l dilutio n an dedg e o f th e mixin g zon e ma y change . Th e reasonabl e potentia l analysi s wil l b e re-evaluate dafte r th e requiremen t

i s addressed . Chlorin e Residua l Wate r qualit y standard s for

chlorin e ar e base do n preventin g bot h acut e an dchroni c toxicity . Th e acut e chlorin e standar di n 0.01 9 mg/ L an dchroni c chlorin e standar di s 0.01 1 mg/L . Th e facility use dchlorin e ga s fo

r th e disinfectio n o f

effluen t t o compl y wit h th e effluen t limit s for bacteria . Sodiu mbisuffat

e i s use dfor

dechlorination . Effluent

i s reflectiv e o f

th e us e o f

th e dechlorinatio n syste man deffluent

values hav e typicall y bee n i n th e 0.00 3 mg/ L range . A permi t

limi t remain s i n th e permi t

t o indicat e th e amoun t

o f chlorin e residua l tha t

woul dcaus e awate r

quality violatio n i f th e equipmen t

wer e no t operatin g properly . Th e p H i s ameasure o f

ho w acidi c o r

basi c asolutio n is . At

ap H o f 7. 0 s.u . th e solutio n i s considere dneutral . Th e purpos e o f a n in-strea mwate r qualit y pH standardi s generall y th e protectio n o f aquati c lif

e sinc e mos t

aquati c organism s ca

n onl y tolerat e afairl

y narro w rang e aroun d7. 0 s.u . Th e Willamette Basi n Water Qualit y Standar dfo r p H i s foun di

n OAR340-041-0290(l)(a) . Th e allowe drang e i s 6. 5 t o 8. 5 s.u . Th e propose dpermi t limit s p H t o th e rang e 6. 0 t o 9. 0 s.u . Thi s limi t i s base don Federa

l secondar y treatmen t

standard s fo

r wastewate r

treatmen t facilitie s (4 0 CFRPar

t 133.102) , an di s applie dt o th e majorit y o f domesti c NPDE S permittee s i n th e state . Withi n th e permittee' s mixin g zone , th e wate r qualit y standardfor

p H doe s no t

hav e t o b e met . Th e Departmen t evaluate dp H usin g aspreadshee t tha t derive s th e p H a

t th e mixin g zon e boundar

y usin g th e tabl e below . Figurel . Dilutio n analyse s fo r p H Calculatio n o f

p H o f amixtur e o f

tw o flows . Base do n th e procedur e i

n EPA' s DESCO N progra m(EPA , 1988 . Technica l Guidanc e o n Supplementary StreamDesig n Condition s fo r Stead y Stat ePag e 1 8 o f 2 9 Modeling . USEP

A Offic e o f Water , Washingto

n D.C. ) INPU T 1 . DILUTIO N FACTO R A T M Z BOUNDAR

Y - (Qe+Qr)/Q e 2 . UPSTREAM/BACKGROUN D CHARACTERISTIC S Temperatur e (de g C) : pH : Alkalinit y (mgCaC03/L} : 3 . EFFLUEN

T CHARACTERISTIC

S Temperatur e (de g C) : pH : Alkalinit y (m g CaC03/L) : 4 . APPLICABL E P H CRITERI A 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 CaC03/L) : Effluen t Tota l Inorgani c Carbo n (m g CaC03/L) : 4 . CONDITION S A

T MIXIN G ZON E BOUNDAR Y Temperatur e (de g C) : Alkalinit y (m g CaC03/L) : Tota l Inorgani c Carbo n (m g CaC03/L) : pKa : p H a t Mixin g Zon e Boundary : Is ther e Reasonabl e Potential ? RPA t Lowe r p H Criteri a 1 2 22. 0 6. 8 25. 0 25. 0 6. 0 75. 0 6. 5 6.3 7 6.3 5 0.7 3 0.3 1 34.2 6 242.9 0 22.2 6 29.3 5 52.4 0 6.3 7 6. 5 N o orp H

Uppe r p H Criteri a 1 2 22. 0 7. 9 25. 0 25. 0 9. 0 75. 0 8. 5 6.3 7 6.3 5 0.9 7 1.0 0 25.7 4 75.1 7 22.2 6 29.3 5 30.0 3 6.3 7 8. 0 N o Bacteri a Th e propose d permi t

limit s ar e base d o n th e E. coli standar d containe d i n OA R340-041-0009(5) . Th e propose d 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 per 10 0 mL . I f asingl e sampl e exceed s 40 6 E. coli pe r 10 0 mL , the n th e permitte e may tak e five consecutiv e re-samples . I f th e lo g mea

n o f th e five re-sample s i sPag e 1 9 o f 2 9 les s tha n o r

equa l t o 126 , aviolatio n i s no t triggered . Th e re-samplin g mus t b e take n a

t four hou r interval s beginnin g withi n 2 8 hour s afte r th e origina l sampl e wa s taken . Th e propose dlimit s ar e take n directl y fro mth e Orego n bacteri arul e whic h i s foun di n OA R340 - 041-0009 . Thi s rul e establishe s numeri c in-streamwate r qualit y standard s (OA R340-041 - 0009(1) ) an destablishe s effluent limitation s an dth e methodolog y for establishin g aviolatio n (OA R340-041-0009(5)) . Regardin g th e genera l conditio n 6 foundi n Sectio n B o f

Schedul e F i

n thi s permi t

whic h prohibit s overflow s fromwastewate r conveyanc e systems , th e Environmenta l Qualit y Commissio n (EQC ) recognize s tha t

it i s impossibl e t o desig n an dconstruc t aconveyanc e syste mtha t wil l preven t overflow s unde r

al l stormconditions . Th e applican t i s no t seekin g permi t

coverag e for

overflow s an dth e permi t

doe s no t authoriz e suc h discharges . Th e Stat e o f Orego n ha s determine dtha t al l wastewate r

conveyanc e system s shoul db e designe dt o transpor t stor mevent s u p t o aspecifi c siz e t o th e treatmen t

facility . Therefore , i n exercisin g it s enforcemen t discretio n regardin g Sanitar y Sewe r Overflows , th e Departmen t wil l conside r

th e following : (1 ) Whethe r

th e permitte e ha s conveyanc e an dtreatmen t facilitie s adequat e t o preven t overflow s excep t

durin g astor

meven t greate r tha n th e one-in-five-year , 24-hou r duratio n stor mfro mNovembe r

1 throug h May 2 1 an dexcep t durin g astormeven t

greate r tha n th e one-in-ten-year , 24-hou r

duratio n stor

mfro mMay 2 2 throug h Octobe r 31 . I n addition , DE Q wil l als o conside r

usin g enforcemen t

discretio n for

overflow s that

occu r durin g a stor meven t les s tha n th e one-in-five-year , 24-hou r duratio n stor

mfromNovembe r

1 throug h May 2 1 i f

th e permitte e hadseparat e sanitat y an dstor msewer s o n Januar y 10 , 1996 , ha dexperience dsanitary sewe r overflow s du e t o inflo w an dinfiltratio n problems , an dha s submitte da

n acceptabl e pla

n t o th e Departmen t

t o addres s thes e sanitai y sewe r overflow s b y January 1 , 2010 ; (2 ) Whethe r

th e permitte e ha s provide dth e highes t an dbes t practicabl e treatmen t

and/o r contro l o f wastes , activities , andflow s an dha s properl y operate dth e conveyanc e an d treatmen t facilities ; (3 ) Whethe r

th e permitte e ha s minimize dth e potentia l environmenta l andpubli c healt h impact s fromth e overflow ; an d (4 ) Whethe r

th e permitte e ha s properl y maintaine dth e capacit y o f th e conveyanc e system . DE Q wil l revie w th e permittee' s determinatio n o f th e one-in-five-year , 24-hou r duratio n winte r stor man dth e one-in-te n year , 24-hou r duratio n summe r

stor ma s describe dabov e i n th e permittee' s facilitie s plan . I n th e even t that apermitte e report s a

n overflo w even t

associate dwith astor meven t an dDE Q doe s no t

hav e informatio n fro mth e permitte e sufficient t o determin e whethe r or no t th e stormeven t

exceed s stor

mevents a s specifie di

n OA R340-041-0009(6 ) & (7) , DE Q wil l perfor

mth e determinatio n usin g th e informatio n containe di n Figur e 2 6 o f th e 197 3 NOA A Atla s 2 entitle d"Precipitation-Frequenc y Atla s o f th e Western Unite dStates , Volum e X - Oregon" . Thi s figure i s entitle d"Isopluvial s o f 5-y r 24-h r precipitatio n i n tenth s o f a n inch" . Th e Atla s ca n b e obtaine do n lin e a t http://hdsc.nws.noaa.gov/hdsc/pfds/other/o r pfds.html . howeve r th e file i s ver

y large . A scanne dversio n o f Figur e 2 6 i s availabl e at : http://www.wrcc.dri.edu/pcpnfreq/or5y24.gif . DE Q wil l compar e th e informatio n i n thi s figur e wit h rainfal l dat aavailabl e fro mth e Nationa l Weathe r Service , o r

othe r source s a s necessary . Temperatur e Fo r existin g andexpande dfacility : A n evaluatio n o f

effluent temperatur e dat acollecte dthroug h 200 8 an d200 9 fo r th e existin g facilit y indicate s that

temperatur e criteri ai s me t a t th e edg e o f

th e mixin g zone . Th e 201 0 mixin g zon e stud y predicte ddilution s usin g th e result s o f aCORMI X v6. 0 modelin g stud y o f mixin g

### Pag e 2 0 o f 2 9
zon e dilutio n for

th e Tri-cit y outfal l for

201 5 projecte dan dcurren t 201 0 discharg e rate s o f

17. 1 an d8. 4 MGD , respectively . Th e stud y indicate s that therma l impact s fromTri-City ma y b e significan t

fo r asumme r

discharge . Sinc e critica l ambien t temperatur e i s assume dt o b e Ta = 20°C , atemperatur e ris e o f les s than 5° C woul dmee t th e standard . Thi s segmen t

o f th e Willamett e Rive r

serve s a s amigratio n corrido r fo r sahnonids . OA R340 - 04 1 -0028(4)(d ) state s tha t th e 7-da y maximu mtemperatur e o f astreamidentifie da s amigratio n corrido r may no t excee d20°C(68°F) . I

n addition , fo

r stream s tha

t d o no t meet wate r qualit y standards , OAR-041-0028(12)(b)(A ) state s that prio r t o th e completio n o f

atemperature TMD L or other cumulativ e effect s analysis , n o singl e NPDE S poin t sourc e that

discharge s into temperature wate r qualit y limite dwate r

ma y caus e th e temperature o f th e water bod y t o increas e more tha

n 0.3° C abov e th e applicabl e criteri aafte r mixin g wit

h either twenty-fiv e percen t

o f th e strea mflo w or th e temperature mixin g zon e whichever i s mor e restrictive . A temperatur e TMD L ha s bee n complete d for th e Willamett e River , therefor e th e abov e provisio n fro mOA R340-041-0028(12)(b)(A ) doe s no t apply . Th e propose dpermi t include s Exces s Therma l Load(ETL ) limitatio n fo r th e facilit

y base do n th e Septembe r

200 6 Willamett e Basi n TMD L for temperature . Temperature Thermal

Plume Limitations Th e Department' s wate r

quality standard s als o includ e th e temperatur e thermal plum e limitation s i n OA R340-041-0053(2)(d) . Thi s sectio n o f th e rule s contain s criteri at o preven t potentia l advers e impact s that

ma y resul t

fromtherma l plume s withi n th e mixin g zone . [OA R340-041-0053(d)(A)] : Th e impairmen t o f an activ e salmoni dspawnin g are awher e spawnin g redd s are locate do r likel y t o b e located . Thi s segmen t o f th e Willamett e Rive r

i s a migratio n corrido r

for sahnonids . Base do n Figur e 304 B i n OA R340-041-0028 , spawnin g i n thi s segmen t o f th e rive r doe s no t occur . [OA R340-041-0053(d)(B)] : Acut e impairmen t o r instantaneou s lethality i s prevente do r minimize db y limitin g potentia l fish exposur e t o temperature s o f 32° C o r highe r t o les s than 2 seconds . Base don temperatur e dat a(2008/2009 ) collecte dusin g acontinuou s recordin g device , th e maximu meffluent

temperatur e o f

23.7° C i s les s tha n 32°C . [OA R3 40-041-0053 (d)(C)] : Therma l shoc k cause db y asudde n increas e i n wate r temperatur e i s prevente dor

minimize db y limitin g potentia l fish exposure t o effluen

t temperature s o f

25° C or higher t o les s tha n 5 % o f th e cross-sectio n o f

th e 7Q1 0 flo w o f

th e water body . Th e maximu meffluen t temperature recorde di

n 200 8 and200 9 wa s 23.0° C an d23.7°C , respectively . Th e Cormi x modelin g dat a(Mixin g Zon e Evaluatio n for TCS D Outfal l o f

th e Tri-Cit y WPC P Volum e 1 o f 3 an d Volum e 3 o f

3 ) indicate s th e cros s sectio n o f th e Willamett e Rive r

i n th e are ao f

th e outfal l i s approximatel y 250 0 squar e feet . Base do n amaximu mtemperatur e o f 23.7°C , atemperatur e o f 25° C wil l b e me t

prio r t o th e edg e o f

th e zon e o f

initial dilution . Effluen

t temperature s will b e reduce dt o 25° C i

n les s than 5 % o f

th e cros s sectio n o f

th e 7Q1 0 o f

th e wate r body . [OA R340-041-0053(d)(D)] : Unles s ambien t temperatur e i s 21° C o r

greater , migratio n blockag e i s prevente do r

minimize db y limitin g potentia l fish exposur e t o temperature s o f 21° C o r highe r t o les s tha n 25 % o f th e cross-sectio n o f

th e 7Q1 0 flo w o f

th e wate r body . Th e maximu meffluen t temperature recordedi n 200 3 and200 4 wa s 23.0° C an d23.7°C , respectively. Th e Cormi x modelin g dat a(Mixin g Zon e Evaluatio n fo r TCS D Outfal l o f

th e Tri-City WPC P Volum e 1 o f 3 and Volum e 3 o f

3 ) indicate s th e cros s sectio n o f th e Willamett e Rive r

i n th e are ao f

th e outfal l i s approximatel y 250 0 squar e feet . A 25 % cros s sectio n woul db e 62 5 square feet . Base don a maximu mtemperatur e o f 23.7°C , atemperatur e o f

21° C wil l b e me t

prio r t o th e edg e o f

th e zon e o f initia l dilution . Th e cros s sectio n i s les s tha n 25 % ((225/2500 ) x 100 = 9%) .Pag e 2 1 o f 2 9 5. 3 Whol e Effluen tToxicit y I n additio n t o analyzin g th e effluent for individua l pollutants , th e effluen t i s als o teste dt o determin e it s aggregat e effec t o n aquati c organisms . Thes e test s ar e know n a s whol e effluent toxicit y (WET ) tests . Effluen t sample s ar e collecte dan daquati c organism s ar e subjecte dt o variou s effluent

concentration s i n controlle dlaboratory experiments . EPA ha s develope dWE T tes t protocol s usin g bot

h freshwate r

an dmarin e an destuarin e tes t species . EP A recommend s runnin g test s usin g a

n invertebrate , avertebrat e an daplant . Organism s use di n WE T test s ar e indicator s o r

surrogate s for

th e aquati c communit y t o b e protected , an dameasur e o f th e rea l biologica l impac t

fromexposur e t o th e toxi c pollutants . T o protec t wate r quality , EP

A recommend s that

WE T test s b e use di n NPDE S permit s togethe r with requirement s base don chemical-specifi c wate r

qualit y criteria . WE T test s are use dt o determin e th e percentag e o f effluent tha t produce s a

n advers e effec t

o n a grou p o f tes t organisms . Th e measure deffec t ma y b e fertilization , growth , reproduction , o r survival . EPA' s methodolog y include s bot h a n acut e tes t

an dachroni c test . A

n acut e WE T tes t i s considere dt o sho w toxicit y i f advers e affect s occu r

a t effluent concentration s les s than that whic h i s foun da

t th e edg e o f

th e zon e o f

immediat e dilutio n (ZID) . A chroni c WE T tes t i s considere dt o sho w toxicit y i f advers e affect s occu r

a t effluent concentratio n les s than that whic h i s know n t o occu r

a t th e edg e o f

th e mixin g zone . Two WE T test s wer e conducte dfo r th e existin g facilit

y i n 2008/2009 , afte

r applicatio n submittal . N o acut e toxicity wa s note di n an y o f thes e test s fo r

100 % effluent . I n addition , n o chroni c toxicit y wa s observe da

t wors t cas e effluen t

concentration s expecte dt o b e foun da t th e edg e o f th e mixin g zone . Th e Departmen t recommend s tha t

apoin t estimat e (IC25 ) b e use dt o asses s th e likelihoo do f

chroni c toxicity . Th e tabl e that follow s demonstrate s th e effluent concentration s tha t cause da25 % reductio n i n abiologica l measuremen t (i.e . growth , reproduction ) an dth e correspondin g dilutio n i n whic h chroni c toxicity woul db e anticipate dfromth e effluent . Fo r example : A significan t

reductio n wa s estimate di n reproductio n fo r P. promelas a

t an effluent concentratio n o f

40.3% . Th e correspondin g dilutio n (2.5:1 ) can b e compare dt o th e demonstrate d dilutio n (18.6:1 ) whic h occur s a t th e mixin g zon e boundary . Th e mixin g zon e stud y demonstrate d dilutio n i s muc h greate r

tha n th e dilution s a

t whic h chroni c toxicit y wa s estimate dandthu s thes e advers e effect s note dd o no t occu r a t concentration s les s than th e 2.4 % wors t cas e effluent concentratio n expecte dt o b e foun da t th e mixin g zon e boundary . Th e WE T tes t result s indicat e th e effluen t

i s no t causin g eithe r

a n advers e acut e o r

chroni c aggregat e effec t

on th e aquati c community . Samplin g month/year Marc h 200 8 Marc h 200 9 Pimephale s promela s

(Fathea dMinnow ) Concentratio n 40.3 % >50 % Dilutio n

2.5: 1 2: 1 Ceriodaphn i

(Wate r F Concentratio n 37.6 % >50 % adubi a

ea ) Dilutio n 2.7: 1 2: 1 Raphidoceliu s subcapitat a

(Algae ) Concentratio n 34.3 % >50 % Dilutio n

2.9: 1 2: 1 Bioassa y stud y for

th e expande dfacility wil l b e base don th e mixin g zon e dilution s fo r th e projecte ddischarg e rat e o f 17. 1 MGD . Th e propose dpermi t include s WE T dilutio n number s for th e expande dfacility . 

## 5. 4 Antidegradatio n A n Antidegradatio n Revie w wa s performe dfo r thi s discharge . Th e permi t i s bein g renewe d withou t an y increas e i

n discharg e loadings . Permi t renewal s wit

h th e sam e discharg e loading s a s th e previou s permi t

ar e no t considere dt o lower

wate r quality fromth e existin g condition . Base d

## Pag e 2 2 o f 2 9
o n th e antidegradatio n review, th e Departmen t determine dth e propose ddischarg e complie s wit h th e Antidegradatio n Polic y for Surfac e Water s foun di n OA R340-041-002 6 (se e Appendi x A) . 

## 6. 0 PERMI T DRAF T DISCUSSIO N 6. 1 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 d activities . Th e permitte e i s authorize dt o construct , install , modify , o r operat e awastewate r collection , treatment , control , anddisposa l system . Th e permi t allow s discharg e t o th e Willamett e Rive r

withi n limit s se t

b y th e followin g schedules . Al l othe r discharge s ar e prohibited . 

## 6. 2 Schedul e A , Wast e Discharg e Limitation s Th e propose dpermi t

contain s limitation s fo r

th e existin g facilit

y andfor th e expande dfacility . Summe r tim e CBOD 5 /TS S concentration s ar e base do n th e basi n limi t whil e mas s loa dlimit s stay th e sam e a s th e previou s permit . Percen t remova l efficienc y limi t

i s dependen t

on influen t BOD/TS S concentratio n whil e ETL limitatio n include s thre e option s o f calculatin g therma l loa

d for th e facility . Th e bacteri astandar dwa s change di n 199 6 fromfeca l colifor mt o E. coli. Thi s permi t renewal include s bacteri alimit s fori? , coli. Thi s schedul e als o include s UV dosag e limitatio n an dlanguag e regarding Recycle dWate r Us e an dBiosolids . Other

permi t limit s remai n th e sam e a s th e previou s permit . 

## 6. 3 Schedul e B - Minimu mMonitorin g an dReportin g Requirement s Du e t o th e type s o f

treatmen t processe s utilize dt o trea t domesti c wastewater , DE Q develope d recommende dmonitorin g frequencie s for parameter s base don th e siz e an dtype o f treatmen t facility . Wastewate r

discharg e permi t

monitorin g frequencie s o f simila r type facilitie s wer e reviewe dfor

specifi c parameter s i n relatio n t o th e facility desig n flow . Simila r monitorin g frequencie s fo

r parameter s allo w for

statewid e consistenc y base do n facilit y desig n flo w an dtype . Th e monitorin g an dreportin g requirement s i n thi s permi t ar e i n accordanc e wit

h th e DEQ' s monitorin g matri x for

an activate dsludg e an dMB Rfacility with adesig n flo w greate r than 1 0 MGD . Additiona l samplin g requirement s hav e bee n adde dt o thi s permi t t o mee t th e effluent

testin g fo

r th e EP A For

m2 A renewa l applicatio n date dJanuary 199 9 an dth e monitorin g requirement s prescribe di n th e DE Q Interna l Managemen t Directiv e fo r

th e Reasonabl e Potentia l Analysi s fo r Toxi c Pollutant s date dSeptembe r 2005 . 

## 6. 4 Schedul e C - Complianc e Schedule s an dCondition s Thi s permi t

doe s no t includ e acomplianc e schedule . Rather , aMutual Agreemen t an dOrde r (MAO ) ha s bee n develope dt o addres s ammoni aconcentratio n an dth e nee dfor capita l improvement s o r

additiona l treatmen t

o f ammoni ai n orde r

reduc e it s concentratio n i n th e effluent discharge . Th e Distric t

i s give n milestone s for

completio n o f

th e necessary improvements . Th e MA O als o include s ammoni ainteri meffluent limi t tha t i s a s stringen t

a s practicable ; base do n th e discharg e monitorin g repor t dat afro mth e las t thre e years . Upo n completio n o f requirements , th e Permitte e i s expecte dt o mee t th e wate r quality standard s fo

r ammonia ; RPA for

ammoni awil l b e re-evaluate da

t tha t time .

### Pag e 2 3 o f 2 9 6. 5 Schedul e D - Specia l Condition s Th e permi t include s eigh

t specia l conditions . Condition s L2& 3 ar

e relate dto th e biosolid s managemen t practice s tha

t ar e t o be followe

dan d includ e areopene

r condition shoul

dthe standar

dbiosolid s practice s be change ds o tha t the y becom e mor e stringen t tha n th e proposedpermi

t unde r the Clea n Wate r Act . Condition 4 relate s to whole effluen t toxicit y (WET ) testin g o r bioassa y testing t o loo

k fo r the potentia l fo r toxi c effect

s fro mthi s wastewate

r discharge . Th e condition specifie s th e organism s an dprotocol s fo

r acut e an dchroni c testing , ho

w thos e test s shoul

dbe evaluated , the qualit

y assuranc e an

dreporting specific s an

dreopene r fo r the permi t shoul di t becom e appropriat

e base d o n the WE T tes t results . Condition 5 define s the operato r certification requirement s tha t mus t be adhere dto i n accordanc e wit h Orego n Administrativ e Rules , Chapte r 340 , an dDivision 49 . Condition 6 include s arequiremen t tha t notification b e mad

e t o th e Departmen

t fo r malfunction s a t the treatmen

t facilit y suc h tha t correctiv e action s ca

n be coordinatedif

appropriate . Condition 7 require s tha

t the permittee have i

n plac e acontingency pla

n tha t lay s ou t prevention measure s an

darespons e pla

n fo r spill s o r unplanneddischarges . Condition s 8 & 9 require the permittee to mee t the requirement s of

OA R340-055 , "Recycled Wate r Us e Rules" . Condition 1 0 prohibits an

y advers e impac

t o n groundwate

r quality . 

### 6. 6 Schedul e E , Pretreatmen t Progra mActivitie s Thi s section include s condition s related t o th e prope

r implementation of

apretreatmen

t progra m i n accordanc e wit

h 4 0 CF R§ 403 . 

### 6. 7 Schedul e F , NPDE S Genera l Condition s NPDE S Genera

l Condition s ar

e the sam e i n all permit s issue

di n th e Stat e of Oregon . Thes e Genera l Condition s hav e five sections . Section A-Standar

dCondition : contain s compliance , penalt y an dassessmen

t o f violations , mitigation , permi

t renewa l application , permi

t action , toxi c pollutan

t discharges , propert

y rights , reference drule s an dpermi t fees . Section B - Operation an

dMaintenanc e of

Pollution Controls : contain s operation an dmaintenanc e of the facilit y whic h includ e operation an

dmaintenance , nee

dt o halt o r reduc e activit

y i n orde r t o compl y wit h the permit , bypas s o

f treatmen t facility , upse

t conditions , treatmen

t of single operationa l upset , overflow s fro

mwastewate

r conveyanc e system s an

dassociatedpum

p stations , publi c notification of

effluen t violation an

doverflow , emergenc

y respons e an

dpubli c notification plan , an ddisposa l of remove dsubstances . Section C - Monitoring an

dRecords : contain s monitoring an dreporting requirements includin g representativ e sampling , flo w measurements , monitoring procedures , penaltie s o f tampering ,Pag e 2 4 o f 2 9 reportin g o f

monitorin g results , an y additiona l monitoring , averaging , recor dretention , record s contents , inspectio n an dentry , an dconfidentiality o f information . Sectio n D - Reportin g Requirements : contain s reportin g requirement s an dinclude s reportin g planne dchanges , anticipate dnoncompliance , transfers , complianc e schedule , twenty-fou r hou r reporting , othe r

noncompliance , duty t o provid e information , signatory requirements , informatio n falsification , an dchange s t o indirec t dischargers . Change s andmodificatio n t o th e Genera l condition s ca n onl y occu r

statewide . Th e Genera l Condition s include di

n th e Schedul e F o f

th e permi t

ar e th e lates t

edition , edite di n September , 2009. - Th e 200 9 change s are summarize dbelow .

« Ther e ar e additiona l citation s t o th e federa l Clea n Wate r

Ac t andCFR , includin g reference s t o standard s for sewag e sludg e us e o r

disposal . • Ther e i s additiona l languag e regardin g federal penalties . • Bypas s languag e ha s bee n mad e consisten t with th e Cod e o f

Federa l Regulations . • Overflo w languag e ha s bee n modified . Formerl y th e languag e state dtha t overflow s i n respons e t o th e fiv e o r te n year even t woul dno t

violat e th e permit . No w i t state s that

overflow s ar e prohibited . DE Q wil l continu e t o exercis e enforcemen t

discretio n wit

h respec t t o overflow s consisten t

with th e provision s o f th e Bacteri aRul e (OAR340-041-0009) . « Reportin g requirement s regardin g overflow s hav e bee n mad e more explicit . • Requirement s regardin g emergenc y respons e an dpubli c notificatio n plan s hav e bee n mad e mor e explicit . » Languag e pertainin g t o dut y t o provid e informatio n ha s bee n mad e mor e explicit . • Confidentiality o f

informatio n i s addressed . 

## 6. 8 Permi t

Processing/Publi c Comment/Appeal 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 are include di

n th e publi c notic e (Se e Attachmen t

G) . 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 may 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 final 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 5 o f 2 9 

## Appendi x A : Antidegradatio n Revie w Shee t ANTIDEGRADATIO N REVIE W SHEE T FO RA PROPOSE D INDIVIDUA L NPDE S DISCHARG E 1 . What

i s th e nam e o f

Surfac e Wate r

that receive s th e discharge ? Willamett e Rive r Briefl y describ e th e propose dactivity : I s thi s revie w fo r

a<genewaT_X>

Rne w permi t

application ? G o t o Step 2 . 2 . I s thi s surfac e wate r a n Outstandin g Resourc e Wate r o r upstrea m froma

n Outstandin g Resourc e Water ? Yes . G o t o Step 5 . (No ) G o t o Step 3 . 3 . I s thi s surfac e wate r aHig h Qualit y Water ? Yes . G o t o Step 8 . (No ) G o t o Step 4 . 4 . I s thi s surfac e wate r aWate r Qualit y Limite d Water ? CjosT^) G o t o Step 14 . No . G o t o Step 2 . Note : Th e surfac e wate r mus t fal l int o on e o f

thre e (3 ) categories : Outstandin g Resourc e Wate r (Ste p 2) , Hig h Quality Wate r (Ste p 3) , o r Wate r Qualit y Limite dWate r

(Ste p 4) . 14 . Wil l th e propose dactivit y resul t i n aLowerin g o f

Wate r Quality i n th e Wate r Quality Limite d Water ? [se e OA R340-04 1 -0004(3)-(5 ) fo r 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 qualit y o r

d o no t constitut e ane w and/o r

increase d discharg e o r

ar e otherwis e exemp t

fromantidegradatio n review ; otherwis e se e "I s an 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.]

G o t o Ste p 15 . Procee dwith Permi t

Application . Applican t

shoul dprovid e basi s fo

r conclusion . G o t o Ste p 21 . 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 ; retur n t o applican t an dprovid e publi c notice . Actio n Approve d Section : Northwes t Regio n - W O Permitting _ Revie w Prepare dBy : _Etsegene t Belet e Phone : 503-229-534 9 Dat e Prepared : Sep t 23 . 201 0o

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