ML14007A085

Response to NRC Request for Additional Information, Dated November 21, 2013, Related to the Byron and Braidwood Stations, Units 1 and 2 License Renewal Application, Byron Station Applicants Environmental Report. Part 5 of 15

ML14007A085
Person / Time
Site:	Byron, Braidwood
Issue date:	12/19/2013
From:	Exelon Generation Co, Exelon Nuclear
To:	Office of Nuclear Reactor Regulation
Shared Package
ML14007A078	List: ML14007A080 ML14007A081 ML14007A082 ML14007A083 ML14007A084 ML14007A085 ML14007A086 ML14007A088 ML14007A089 ML14007A090 ML14007A091 ML14007A092 ML14007A094 ML14007A105 RS-13-282, Response to NRC Request for Additional Information, Dated November 21, 2013, Related to the Byron and Braidwood Stations, Units 1 and 2 License Renewal Application, Byron Station Applicants Environmental Report. Part 4 of 15
References
RS-13-282
Download: ML14007A085 (126)

Text

Byron Environmental Audit - Request for Additional Information Response Question #:

HH-1 Category:

Human Health Statement of Question:

Provide NPDES monthly discharge monitoring reports for the past five years.

Response

The NPDES monthly discharge monitoring reports for all months of years 2008 through 2012.

and January through July 2013 are provided.

List Attachments Provided:

1. NPDES monthly discharge monitoring reports for January 1, 2013 through July 31, 2013.

2. NPDES monthly discharge monitoring reports for January 1, 2012 through December 31,2012

3. NPDES monthly discharge monitoring reports for January 1, 2011 through December 31,2011

4. NPDES monthly discharge monitoring reports for January 1, 2010 through December 31,2010

5. NPDES monthly discharge monitoring reports for January 1, 2009 through December 31,2009

6. NPDES monthly discharge monitoring reports for January 1, 2008 through December 31,2008

Exelon.

ExeTon Generation Company. LLC www.exeloncorp corn Nuclear Byron Station 4450 North German Church Road 8ron, IL 61010-9794 February 18, 2011 LTR:

BYRON 2011-0031 Fie:

2.09.0411 1.10.0101 inoie Environmenta PMtecton Agency Water Pollution Contol Compliance Assurance Section #19 1021 Norlh Grand Avenue East P.O. Box SM76 Sanged, IL 02794-9276 sWbe Byron Station Mon" DIOcharge Montn Report In accordance with National Pollutant Discharge Eiminati System (NPDES) Permit Number IL0048313,Isue

%Sepsmber 8, 2000 we are submitting the Monitoidng Report Byron Station. Units 1 and 2. This report covers the period January 1,2011 through January 31,2011.

If there are any questions regarding this report, please contact Ms. Zoe Cox, Environmental Speciait, at (815) 406-035.

Brakdltey J.Adams Plant Manager Byron Nuclear Generating Station BJArZC/vlb Attachments

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ATTACHMENT TO COOLING SYSTEM BLOWDOWN LINE (Outfall 001)

DISCHARGE MONITORING REPORT For Exelon Byron Station

..... Permit-H 0483-3----..

January 2011 BLOWDOWN TEMPERATURE MONITORING:

Date Calculated Maximum Allowable Blowdown Temp. (Degrees F)

Maximum Actual Blowdown Temp.

(Degrees F) 01/01/11 01/0/11 01/15/11 01/22/11 01/29/11 120 120 120 120 120 71.8 61.5 69.0 68.3 68.8 Note:

Station proceduns derive the Calculated Maximum A~lowble Blowdlw Teqmp ure based on existing Rock River temperature and a calculated maximum river temperature incease. When the arithmetic sum of these values exceeds 120 degrees Fahlenheit, the Calculatd Max~imum AowaNe Temperaure limit defaults to 120 degrees FarenheitL HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of January 2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

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ATTACHMENT TO COOLING SYSTEM BLOWDOWN LINE (Outfall 001)

DISCHARGE MONITORING REPORT (Page 2)

For Exelon Byron Station Permit U1)4313

-4anmuay-20~-*............

COMMENTS:

1.

The weekly halogen concentration curves and daily halogen dosing time reports are attached.

2.

Bromine was not used this month.

3.

There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.

4.

Flow existed through this outfall 31 of 31 days.

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EXELON BYRON STATION Permit Ul.0048313 WEEKLY HALOGEN DOSING INFORMATION 01/01/11 is 2is 01A)2111 20 19 OlM1I i1 20 20 01/04/11 20 20 0105/I 1 20 20 01A)6/I 23 23 01/07/11 20 20 018/ I1 20 20 0109/I 1 20 20 HALOGEN DOSING CURVE Concentraion of total residual chlorineihalogen vs. minutes of chlorination period.

Date: 01/02/I1 Time: 10.18 Analynd by: G.N.P.

Reviewed by: D. M.

Unit: 2 Note:

The limit of detection for dte imirument as tested in the Station Labontory is 0.02 mg/L All values less than this limit are reponted fbr information only.

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EXELON BYRON STATION Permit 104313 WEEKLY HALOGEN DOSING INFORMATION UI U-2ITL 01/10/1I 20 20 01/1111 __

20 20 01/12/11 20 20 01/13111 16 17 01/14/11 20 20 0111511i 21 20 01/16/11 20 20 HALOGEN DOSING CURVE Concentration of total residual chlorineihalogen vs. minutes of chlorination period.

Date: 01/11/ 11 Time: 12:41 Analyzed by: L K.

Reviewed by: D. M.

Unit: I Note:

The limit of detection for the imnstument as tested in the Station Labo~ratory is 0.02 Mg/L All values less than this limit are repoMed for information only.

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EXELON BYRON STATION Pemit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION SMi M) 01/17111 20 20 01/18/11 20 25 01/19/11 19 22 01/2I 1 22 20 01/21/II 18 19 0122i/lI 18 19 01/23/11 18 19 HALOGEN DOSING CURVE Concentration of total residual chlorinefhalogen vs. minutes of chlorination period.

Date: 01/18/11 Time: 11:55 Analyzed by: T. K.

Reviewed by: D. M.

Unit 2 Note:

The limit of detection for the intrume as tested in the Station Laboratory is 0.02 mg/L All values less than this limit are reported for information only.

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EXELON BYRON STATION Permit IL0048313 WEEKLY HALOGEN DOSING INFORMATION U-1 01/24/Il 20 20 01125/11.

20 20 01/26/ 11 20 20 01/27/I I 20 20 0128/lI 20 20 01/29/1I 20 20 01/30/1I 19 20 HALOGEN DOSING CURVE Concentration of total residual chlorineIhlogen vs. minutes of chlorination period.

Date: 01/25/11 Time: 11"58 Analyzed by: M.D.

Reviewed by: D. M.

Unit: I Note:

The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L All values less than this limit are reported for information only.

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Date: 01/31/i I Time: 11:53 Analyzed by:

MW.

Reviewed by: D. M.

Unit I Note:

The limit of detection for dhe ismtruent as tested in the Station Laboratory is 0.02 mg1L All values less than this limit are reported for information only.

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Exelkn.

Exelon Generation Company, LLC www.exeloncorp.com Nudear Byron Station 4450 North German Church Road Byron. IL 61010-9794 March 22, 2011 LTR:

BYRON 2011 -0051 File:

2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, issued January 24, 2011 we are submitting the Discharge Monitoring Report for Byron Station, Units 1 and 2. This report covers the period of February 1, 2011 through February 28, 2011.

On February 2, 2011 the Unit 1 Natural Draft Cooling Tower (NDCT) debris fence became blocked with tower fill material that was damaged by the blizzard conditions experienced on this day. The debris fence blockage caused an overflow of cooling system blowdown water to exit the NDCT basin and flow Into the storm water ditch located on the West side of German Church Road. The water flowed North in the storm water ditch and entered Woodland Creek via storm water Outfall 003, East Station Area Runoff. The estimated amount of cooling system blowdown water that flowed through Outfall 003 was determined to be approximately 1,500 gallons.

Analysis of the overflow sample determined a pH value of 8.6 and a zinc concentration of 0.034 mg/L Byron Station Operators took Immediate measures to lower the cooling system blowdown water level in the basin of the NDCT to stop the overflow condition. Actions were taken to remove the damaged fill material from the debris fence. To prevent future debris fence blockage, Byron Station has a repair plan scheduled for March 2011.

If there are any questions regarding this report, please contact Ms. Zoo Cox, Site Environmental Specialist, at (815) 406-3035.

Respectfully, Brdly :.Adams Plant Manager Byron Nuclear Generating Station BJA/ZC/CA Attachments

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4300 WINFIELD RD WARRENVILLE, IL 60665-5701 FAC.IITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)

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EXELON GENERATION CO LLC LOCATION:

4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHPEIMJNATION SYSTEM (NPDES)

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EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE, IL 60555-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)

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4300 WINFIELD RD WARRENVILLE. IL 60W65-5701 FACILTY:

EXELON GENERATION CO LLC LOCATION:

4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT OISCHLMINATION SYSTEM (NPDES)

DIS(CARGE MISrOMNG REPORT (oUR)

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EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)

OCHNARGE MONTORIMo REPORT (DMR)

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Z NUMSERJ MONITFORNG PERIOD IMWD~MMf~YYYYIlWWI FROM 02iW201 TO 02121201 Pa~vm wwad OWN&4M OUR Mailing ZIP COOE.

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DEMINERALIZER REGENERATE WASTE (0011 EImnal Oudd pR QUANTITY OR LOADING QUAUTY OR CONCENTRATION Mo.

mou.ngcy SYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS SoAds.

10W WSpeWad SAMPLE

4.

5_

MEASURMW 0063010 PEROT 15 30 nei EFfiiertl Gross REa N

300A AG DOALY MX MOnx" COMP" Chnorr*m. hexavisl (as Cr)

SAM"PE MEASUREMENT 50 0103210 PERMIT

.1

.2 ElMeMA Gross REQUIW3AENT 3OoA AVG DALY MX Oak GRAB Ctuonium, ktWi (as Cr)

SAMPLE 5

MEASUREME__

__T 0103410 PERMIT 1

2 n1L Effljut Gross REQUIREMENT 30OA AVG DALY MX D

GRAB Copper. Iow (as Cu)

-AMPLE 01042 10 PER.5-Eiben Gross R

30DA AVG DAILY MX Daly GRAB Iron. totla (as Fe)

SAMPLE 0104510 PERMIT

-MO Faiuent Gross

-EQUIREMNAILy LY MX Day GRAB Lead.

oto (as Pb)

SAMPLE I

s.

01051 10 PERwMT

.2

.4 fot-EFfluent Gross REQUIREMENT 300A AVG DAILY MX Daly GRAB NkAeI. IoWa (as NI)

-AMPLE 0106710 PERMIT

=

2 migL Eflumt Gross REQUIREMENT 300A AVG DAILY MX HNAITITE PRNWVIAL EXECUTWE OFFICER I.a TEEHNEDT udleaj --. Actowe O%*s--

COWINTS AND *XP*ANATION OF AMY VIOLATIONS (*imime uU bIa)

GL I -TI4C, WAS WD D O CoM" OF PPo

-5ACD SMAM C

,bi0AEcA L CLCA4lJ6 K/AS TMW A

DWAG TrHIS A7A-t 4/.

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law *Adam m" ba4mot 02fluml PINP 1

NATIONAL. POLU IIANT O4SCABJMINATION SYSTEM (NPOES) mOCHARGE MONITORING REOR (OUR)

• AW,id PERMunTEENAME/ADOIRES

(&wkdoFdoiyNWn1.nW,

1. Uwi NAME:

EXELON GENERATION COMPANY LLC ADDRE:

4300 WINFIELD RO WARRENVIU.E. IL 60555701 FACILITY:

EXELON GENERATION CO LLC LOCATO: 4450 NORTH GERMAN CHLIRCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIEN SPEC DRM*aii*UfPCODE 61010 MAJOR (SUSR 01) 1t REGENERATE WASTE (0011 FExtemal Outdd ENOamd wI I

~R

~NO.

PRQEY SAMPLE PARAMETER QUANTT_

OR QUALITY OR CONCENT__RATION

.... NOFE_

NgrLYUM TypE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Zinc. total (as Zn)

SAMPLE 5

01092 10 PERMIT 2

W40L Eftkent Gss 300A AVG DMALY MX Day Flow. In cow"u or Otuz teasainat p~af SAMIPLE MEASUREMENT 0_01 O070

))3 g

5005010 PERRiq Mn Iq Mmon.

M-EI~kwo Gros EURMmT SD V

AY MX REOIRIIN pap __

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l md

/

JlJ I/

l vm 02221 IEPA Form =94 (ROWAN% P Gv

@dMw* MOV bs 0DO&

02rAFAI I Pop 2

NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)

D-CHARGE ITRWl REPORT (w R)

FamAna cml N&-

PERMITTEE NAMFJADODESS (m:IpFactyNwm.tcmW.f IDlfwwO NAME:

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE, IL 60555-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COX1ENV SPEC 1

13 1

1 60" 1

I PERM NUjIlIBEIt 1, 1 DISCHARGE NUMER I DMR MIbn ZIP CODE:

61010 MAJOR (SUER 01)

SIP PLANT EFFLUENT(FORUER 0018 Exbrna Ouldd L~I PROMS I 000MIi I K~LrJy TOI m

i PAAMTR lAMTH OR LOADOIS QUALITlY OR CONCENTATION NE.

PSOF 1

STMPLE VALUE VAL UEIJV L EVAUIA U

~

f S 0

Q O

' C BOO. 5-.20dayodg.C

_____PL j-aj a.o 0031010 ppyIN

.3WAV D0LY MX 3_DA

-V-EthintGrssR~JI5MNT 30 beG DALY MX Maih 00"0 1 0 PupWy S

GRA Efbasa Gross pajpIU1 g j MIASUR WW__

_____e

-AMPLE

.29. 4, 0

dO90 DC-.

10lai PERMAT 5.3 10A5 am-30 0a TiePr CL 00530Gos EU~LMM W

10G IALY MX 30DA AVG DALY MX Monih CM Flow, In am"uf Or lini Irsatmen Plai SAIIIPLE

.00 0000 13 Ch WMSAURWOEN.CXS 000---

0 1S 50050 10 PERMI Daly Man Mn.

MM Efluieet Gross I0D AVG Y MX INANITm.LE PFicUM. Eucinwi oF"iER !=

TEEPON DAT "ir-adlt

-T. Adamis

-100/=,

TYPED OR PUNTED GNTAM-0IWUM mm COENTB MMWU MA1IU OPMW VIOLATiONS(Nutmacs cUaftinmo la GL. 1. FLOW 69 Si~r 'rAROWGH -MIS OUTIFALL-425~

DOV q DAYS DUEti~jj -rife AAWbIN1.

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P, "Mcom m" be ""

02==111 IV PW I

PERWfMEENAMEiAOOMSS (hici*.

ef UPocoo hewqm NAME' EXELON GENERATION COMPANY LLC ADORE8S:

4300 WINFIELD RD WARRENVILLE, IL 6055.6701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROWO BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT OISCIVA.MINATION SYSTEM (NPDES)

DOICHtARO REPORT

• U)

PERMIT NUMBER I ISCHAOE NUMBER

-0/0 TO PEROD MINDONYY I

I UW I~V FROMd 0=~1/2011 1TO 02/28/201

'S 01m 0

61010 Noobld~mus DNR Nd&W 2W CODE:

MAJOR (SUBRo0)

W#rP (FORMER 001C)

Exlwral OudI nAwmngTI PR3wwAL UUTvEm woUU

=iinT01"NEDT TWED Rpw PUTOffEEAOI I. TEIRE WAS #10 01scAqGe air PROCESSE SYVA-bI C Gl~krOa COCAWICJ4L CtAlElAhM~,

W3ST7lMA47Eif J)"IA~ rTMI

~r&VtA 1 A.FLoW 67X15'Er 1A**OLJG/

7W#'S OUr9.4wd 4l &-Ro MAYS' pUgpVCG ri/e

1. VDr#.

EPA Fom 232M i(Rw.OWS Pmiem GiWA uw be us@&

0212113 Pops I

PERMMnEE NAMEJADDRSS (bmkx* Fya Mwetocn If DfwmQ NAMIE EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60555-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)

-SCHARGE MO-IT'O1190 REPOT (oUR (L"ME1-1 01 1 PEROMT N0M1 T1 uo~om mI

~whum y

FROM 02001f2011 TO1 0W201j FamA pmnd oHs "m DMR iffl"g 2P CODE:

MAJOR (SUSR 01)

WWTP (FORMER 001C)

Extera OWN 61010 No bdmuuqp-pARAMTR QUANTITY OR LOADING QUALITY OR CONCENTrATI*ION EX OF AIU SYPLE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Zrnc, ttl (as Zn)

SAMPLE 01092 1 0 P..lT-.

1 2

Mei Efauent Gros R, EQUIREMENT 3A AVG DAILY MX taGA Flow. In conuit or ftru Vetmalen p~mnt SAPE 0

Ol

)C 90 13 -

RECIUI O.OIR O.O34Z M e35" col 50f0luent Gr010 noRE R

0Mn j

Daly CONTIN NAMEIWL PRU~WA X~c~hI OF~CERI TUWN~

I DTEm COsITS AMQ EXKLAATMO OF ANy VIOLAION pbbmanw allmmf i

1m GL EPA Fwm 3U0- vi Powdm

-Ile mW be met.

t W2WNlIV Pegs 2

0 PERMITTE #AMEIA0OPESS (bm#*ds FcWyNanutolosiu W~mn0 NAME' EXELON GENERATION COMPANY LLC ADDRESS; 4300 WINFIELD RD WARRENVILLE. IL 60655-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 81010 ATTN: ZOEY COX0ENV SPEC NATIONAL POLLUTANT DCSCHAELUUNATION SYSTEM (NPOES) mDcMHAR MtONFrOMN REPORT (oM*

D1-F WRWM (1

I ITO 0m/2m l

FROM (o12totii To r-mami T I

9W.-

DMR MUslbg ZP COOE.-

61010 (SUBR 01)

RADWASlE TREATMENT(FORMER 0OlD Extea Outi No Dbscwmrge QUANTITY OR LOADING QUA&AIfY OR CONCENTRATION NO.

gp=c SAMP4LE PARAMETER EX_____

T__________

_____0ML YPE VALUE VALUE UNITs VALUE VALUE VALUE UNITS Solft. tow al mxdd

&AMPL.E

<0....'

~

q MEAMSRET ME<0.5

<T0.

0

• qO 00630 10 PERMIT 15 30 04o.

Tvdce PW Efflue Gross REUIRNT 300A AVG DALY MX m

COpos Flow Idu orund outrestrntwdp SAMPL-MEASURMENT

0. =35

o. xa...

0 135 c*

50050 10 M.

Re u

Effmuentms RJSQUlREMElT 000ATVY COINII COirsN AN EXPLANATION OF ANY VIOLATI 101wU(beas m.All l

uIIte) mi I.- FLoiPJ Ek'ISED 7WROI16H 'rift ofrpAw u-OP 2? oA Ys xo r& me o~rA/.

EPA Pam 3320-S (Rav.0t*S) PmImag ailmis ~

be me~

Passi

&A Fam 1=06-1 W.&W.K" Pf*v odftft ma to a" Page1

PERMTTEE NAMEIADDRESS (hnwtU$ FtNy nt*vwrv fbtq NAME:

EXELON GENERATION COMPANY LLC ADORESS:

4300 WINFIELD RD WARRENVILLE. IL 60565-5701 FACIULIY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCIAGE ELIMINATION SYSTEM (NPOES)

-s.Mm imn'~om~m w*.,m (om IPERMIT itl IR DISCHARGE NUMSER MONITORWN PERI1OD FROMDOM I

I U-W 02F1R2M11 TO 02/2802011 F-App

-u fu~co CMMW* MPCODE:

61010 MAJOR (SUR01)

STORMWATER (FORMER 001E)

Exenal Ouel No bwscarsE QUANTITY OR LOADING QUALTY OR CONCENTRA10 NO.

mumoc SAMPLE PARAMETER EX_____

x O

Y TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Solds. totW suspeded SAMPLE 00530 10 PERT 30 DOOL Efluent Gross REQUIREMENT 300A AVG OLY UX Solid, to suspeded

--. SAMPLE 0053080 PERIT 30 100 mIA Olver Teetnient. PAoes Contet REQUIREMENT 300A AVG OAILY MX Weetl GRAS Chronum, hexavalet (w Cr)

SAMPLE 01032 10 PERMIT

.1

.2 aL_

Eflhme Gross RCARME 300A AVG DALY MXD Chroinium, lots (as Cr)

SAMPLE MEASUREMENT

_500 01034 1 0 PERM33" 1

2 MW Efliht Gross RmImNO 300A AVQ DALY MX Dy GRAB Copper. tow (as CU)

SAMPLE 01042 10 P.5T s

1 m50.

Emiet Gross IREQUIIREENT 300A AVG DAILY MX D*

GRAB Ira. total (as Fe)

SAMPLE 01045 1 0 PERMIT MO.L Efflue Gross REQUREMENT DAILY UX G

Lewd. total (as Pb)

SAMPLE Soo MEASUREME____

__N_

01051 10 PERMI

-4

-2

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GRA INANflITLE PRmcWAL exicuiws OFFCE TRPN DAT Q

,3/,U lw I I "I15

"'-0 O3TURE O O

O FF oft'u ToPED OR PfNTED ANYRtEn

=*m AmUIm v

C0M11U AND XPLANTlOh0NfOfTVIOLAT=8IS(RatI canaenW here)

Gi. I.

EA WAS4 hA16 Vl"~p4Rj6 OF PRCE~Z' SM.4ii GEAJtat c cmx*M. cccAwoV~& vA STE WATG6 bui/AA me, A~bvrW.

R. Fw W-"

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22 F v4 Dsptc a*G 77w tIadt?1 VA FOO "214 W P,

"Mom 00 bm "ad, ormwil w

ft" 1.

PERMrrTEE NAMEIADDOSS (bhd Fw N&MC002ona ff0ew1 NAME:

EXELON GENERATION COMPANY LLC ADORESS:

4300 WINFIELD RD WARRENVILLE. IL 6055575701 FACILITY:

EXELON GENERATION CO LLC LOCATlON: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHWL MINATION SYSTEM (NPDES)

SClARGE MONTOlNO RIO (D

imwvwI IMwoIol FROM 02=0112011 TO

,,2*12011 Owm

'~

DURIMlbg PCODE:

61010 MAJOR (SUOR 01)

STORMWATER (FORMER 001E)

Fx*

OumNofIwm NO.

wosa SAMPL.E QUANTITY OR LOADING QUALUTY OR CONCENTRATION NO on SAMTYPLE PARAMETERl E__________________

x OAMOMYS YE VALUE VALUE UNITS VALUE VALUE VALUE UNITS NkW.6 botal (as NI)

&AMPLE

-500 MEA~tmMWN

_t.A 01067 10 P

1 2

m E010671 Grow 0

30DA AVG DALY MX o

ZMC. totli (as Zn) 5AMP-ME~MUW 01092 1 0 P

1 2

mOL Efuemt Gross RemmnwT 30DA AVG DAILY M o

OpA Flow, in condu or Uvu beabywe pIwd S

0 13 0.

0

,9O C 4 50050 10 pEWmuIT RPat kon L eq MN.w TVA0-- Per lF Gsg m3AM UII AVk ima.Y MX coMim N

II~~ rNA XEU FN RPOEDATE pier&a M%^"nS 80GRTUR PI AL I)C~V OFFI...

OR~

TYPED~~

Of PIK

-f=T05Z COMINIMM AND MCLANAflON OF ANY VIOLATIS (ere.

alsleinw bet) r.1eaSbsd4 br1 GL I. No1TU9619 BULDeACY FI ICEAIJ OL Sump o ra~EtIc NNW-MCNAIcAL A4CrAL cLE*JWG u'j~srrT u

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ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 February 2011 Page I of 2 MONITORING DATA:

CWCWB D

Row Rock River DATE Temperature mC d Flow dog F Cfb 02/01/2011 64 18.46 6920 02/02/2011 63 20.17 6060 02/03/2011 61 16.56 5620 02/04/2011 69 18.03 6010 02/05/2011 68 20.77 6940 02/06/2011 69 17.53 7310 02/07/2011 70 14.34 7420 02/08/2011 70 17.45 7410 02/09/2011 63 8.71 7200 02110/2011 63 16.23 6810 02/11/2011 69 21.37 7150 02/12/2011 71 20.49 7440 02/1312011 73 16.84 7750 02/14/2011 72 10.64 8010 02/15/2011 66 17.11 8100 02/16/2011 71 13.72 8130 02/17/2011 75 16.63 9030 02118/2011 72 16.89 12800 02/19/2011 64 21.51 14300 02/20/2011 70 18.02 11000 02/21/2011 66 13.47 13200 02/22/2011 63 18.94 14100 02/23/2011 68 16.69 13100 02t24/2011 68 18.63 12500 02/25/2011 64 14.49 12100 02/26/2011 63 24.44 11800 02/27/2011 64 16.89 11700 02/28/2011 65 12.60 11500 K:\\BYR_Cf-IBYRON.DB\\CIerk\\Monthly Discharge Monitor Rpt\\2011 ReportsWeb 201 1\\ATTACHO1.doc

B ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 February 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of February 2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS:

1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.

2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.

3. Flow existed through this outfall 28 of 28 days.

4. Per Special Condition 24 the Influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value measured was 2.58 mg/L on 02/07/2011. The CWBD TSS values obtained were 6.00 mg/L on 02/04/2011 and 3.30 mg/L on 02/07/2011.

5. Rock River flow for February 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).

6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals In February 2011. (Special Condition 15)

K:ABYRCHFYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\Feb 201 I\\ATTACHOI.doc

Exelon.

Exelon Generation Company. LLC www.exeloncorpxcom NuI a

Byron StationNuclear 4450 North German Church Road Byron. IL 61010-9794 April 20, 2011 LTR:

BYRON 2011-0061 File:

2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, issued January 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units I and 2. This report covers the period of March 1, 2011 through March 31, 2011.

On March 11, 2011 a pump seal leak was identified on a station heat pump located in the Fuel S

Handling Building (FHB) Train Shed. The water leaking from the pump was directed to a floor drain in the FHB Train Shed that is piped into the station's stormwater drainage system. The water in the stormwater drainage system for the plant is directed to an oil separator and is then discharged into the Construction Run-Off Pond (CROP). The CROP is designated as Outfall E-01-0 in the station's NPDES permit. It is estimated that approximately 500 gallons of station heat water was discharged to Outfall E-01 -0. Station heat is a closed water system that is used to provide heat to various areas of the plant The water Is chemically treated to prevent corrosion of the piping using chemicals that have been previously reviewed and approved by IEPA. Station heat is not currently listed as a contributing discharge to Outfall E-01 -0. The floor drains in the FHB Train Shed are all labeled to contact the site NPDES Coordinator prior to directing any water, other than stomwater, to the drains. Once it was identified that the Station heat water was directed to the FHB Train Shed drains, actions were taken to redirect the water to an appropriate catch container so the water could be disposed of properly. A work request was generated to fix the pump seal leak and it is being tracked in the station's Work Control process. Outfall E-01-0 met all NPDES permit limits for March 2011.

If there are any questions regarding this report, please contact Ms. Zoo Cox, Environmental Specialist, at (815) 406-3035.

Respectfully, Bradley Adams Plant Manager Byron Nuclear Generating Station BJA/ZC/ca Attachments

PERM-TEE NAMEJADOMSS (kwkd.Fam*Nwj,,wmt n Imwwwq MAKE.'

EXELON GENERATION COMPANY LLC ADORESS:

4300 WINFIELD RD WARRENViLLE. IL 60556-5701 FACILTY:

EXELON GENERATION CO LLC LOCATION: 445D NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXfENV SPEC NATIONAL POLLUTANT DISCHRE ELIMiNATION SYSTEM (NPOES) ms a.VNEMO WPOR (OUR)

M1 3 01-0

-OIOA PERIOD 0mma1/01 MMIDt O

0 Y1 1

FROM I 03Mi207117 TO 1 03&31/2011 FmA-l am ma

-ma OmR a"ZIP CO 61010 MAJOIR (SUBR 01)

COOLING SYSTEM SLOWDOWN E~smTi Outa PARAMETER QUANTITY OR LOADING QUALITY OR CONCENTRATION NO OF SMftV TYPE VALUE VALUE UNIS VALUE VALUE VALUE uNTSI Temperature. water d "g. khrmarI SAMPLE 1

0 000110 PER*I

-La-sMom dogF Eiemt Gross REQIGItUENT U_

W

-4 00&0 czqo C2 004" 10 PERMIT 8

9sk Efiecut Gross RZUW436EUTg MINIMM MAXIUOA Weemy OPAB SO W....SAMPLE 3 3.0 S q.-

0

, '5 00530 1 P

pERMIT Mar" GrOSS RhrQUwRUIRGMENT MEASURTMlf<1-Iýrg OlOra s e SAMPLEt u...

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mA cronhium. tow (as Cr)

SAMPLE Lo) 7 k

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.2 Effiumt Gross REQUIREMENT DALY MX WAu GRAB Coppe-. tow(C)

SA 0.01 40 R

0104210 PERMIT

.0o1 WOW.

EI*wt Gross REQUIREMENT OALY MX W

RAB Z-.

(as Zn)

SAMPLE 0

Q 01092 0

Pp y 213 A33 al-Efiient Gross REQUORMEN 300A AVG DAILY MX Wely GRAB WAMEMfTII PRIOWAL inXECcurw owucu ad-a1 1 TELEPHON DATE I

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PERMITTEE NAME/ADORESS (/nwkd Faeft wmAocabw if D#bun NAM&

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60665-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION:

4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCH EIMINATION SYSTEM (NPOES) m 1o

-0m REPORT (ORR 11004813

[ZZ 1-Z PERMIT NUMUE jD"-

NAJE FS001,TO03N1 PER10 1

FROM 030011201 TO 03/31/2011 401 W, -

Mailing ZIP CODE:

61010 MAJOR (SUBR 01)

COOLING SYSTEM BLOWDOWN Exrmw Ouftg N Obdchargs GI.

WA FOrm 122B4 (Rsv*I) PmIum ~

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Pap 2 EPA form IND-1 (ftvAU0% P - dam odd= w" be ww&

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PERWtTEEWAAA/D00SS (bwmftFaWs'IAkmoml*AW" NAME EXELON GENERATION COMPANY LLC ADDRESS:

4300 WflELD RD WARREDVILLE. IL 605666701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. tL 61010 ATTN: ZOEY COXIEWN SPEC NAT1WI. POLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES) 0U8CHAREUNmWORN= REPORT (OUR) 1 PIR I DImSC,*uRGINUMSFER

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1 WDONTYYI FR= I

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OAM0DRESS (Is

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EXELON GENERATlON COMPANY LLC ADDRESS: 4300 WINFIELD RD WARRENVILLE. IL 60555-5701 FACIUTY:

EXELON GENERATION CO U.C LOCATrON: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT I 1M NATION SYSTEM (NPOES)

OISCHARN 00lom REPORT (DUR)

MON-TORIN PERIOD I

rMSiY I

I MW,*

uM FROM I 03012011 TO 03/31/2011

• 0~~~

~au~.. um DMOU Mfi ZIP CODE:

61010 MAJOR (SUSR 01)

STORMWATER RUNOFF BASIN Extmem Oudafl PARAMETER QUANTlTY OR LOADING QUAUTY OR CONCENTRATION Ex P, Afl.*SM YPE VALUE VALUE UNIT$

VALUE VALUE VALUE UNITS Nickal ww (as NM)

WA K En 01067 10 Few Oll

.176 Effn Gross RE__MENT 300A AVG oAL.Y MX U

GRASw Zk wc tola (as Zn)

SAMPLE M

E A

U W

_T 01092 1 0 047

,LgA.

DaG.

Eftent GroSS 300A AVG DAILY *X O adS Oonoae SAMPLE 0358210 Pon"r 5

20 mor.

When GRAS Ellimel raoss REQUIREMEN 300A AVG DALY MX Ddp Flow, in condui or Uuu trsonent plak SAMP L.

0 R N E-M A Efilhient Gross pEQmgEE P-AkrG M~

C0111111mNT AnS mLmAu""

OW AnY VIOIAM0N (Rwaftma al Wfow 110101 GL. T14 IJS PSOL4GE ftniwr iw's Nor us2D rmis Abv7W.

el. Tl~ifge WAs do b'31C144GE OF PROCe-esSCD S7wAMf c.ENSGAArg CI-/EMICAL CILIAAfIr/A ksmSE4T W', 7H 1

EPA km 3UG-1 Mmftft Pi e adlimmmWimeamt Pagel

PERMnIEE NAMEIAOORESS (bnmftl Fammy NameAocwon ir Ow NAME:

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60555-5701 FACILTY:

EXELON GENERATION CO LLC LOCATION:

4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIE1NV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)

DISCHARGE MONITORING REPORT (oMR)

PERMIT NUMBER DCHARGE NUMBER MONITORMNPERIOD IMWWfM I

I-MMIDWY FROM 030102011 TO 03/31/2011 F-OSS N~ -

OMR Malingi ZIP CODE:

81010 MAJOR (SUBR 01)

DEMINERALVER REGENERATE WASTE (0011 Extrml Outfall Nooma~hUS PARAMETER QUANTITY OR LOADING QUAUTY OR CONCENTRATION NO.F ANAYSIC SAMPLE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Soids totalsu*.l.,'

SAMPLE..-.-5

<.3

<014 0

,A ?'5 E..

MEASUREMENT 0053 10 PE, RMIT.

15 30 mgL.

Effluerd Gross REQEC tI!RMEHT 300A AVG DAILY MX MOM*

Chromkum, hexavalem (as Cr)

SAMPLE 5700 0103210 _RMIT 1 A ElMient Gross REQUIREMENT A AVG DALY MX C*mt, total (as Cr)

SAMPLE._.*

MEAREM E N-5-00 0103410 PERMIT 1

2 MWL Effluert Gross REQWMENT 300A AVG DAILY MX Dl GRAS Copper. total (as Cu)

SAMPLE

___u__.__ r 5"00 0104210 PEASIR

-MENT

.5 5"

m01 Eflueart Gross R-QUIREEW4T 300A AVG DAILY MX Deiy GRAB Iron, total (as Fe)

SAMPLE 5.)Q MEASUREMEN'T 5-00___________

0104510 P

1 mgfL Effluent Gross REQUIREMENT DAILY UX Omi GRAm Lead, total (as Pb)

SAMPLE MEASUREMENT

_0_

01051 10 PERIUT

.2

.4 notOm Euikie Gross REQUIREMENT 300A AVG DALY MX DG N*ce. total (as NI)

SAMPLE MEASUREMENT 5____

00_

0106710 PERMT 2

me&GA Effluent Gross REQUIREMENT 300A AVG DAILY MX Daly GRAS GL I.THEE WAS 4D DIMCj.4~AGC oFPPIRESSEr' SMAN GOtJER~ro CI#EAI4L. CLCAA41A)

WASTEUA TEA? DCM'it wis lA/I AiY1.

2. FLOW 6KISTMtD AS oF* 31 DAY'S 'DUjiiG r-HiS I_4rwrii.

A IPA F00 M320.4 W

) Prum 0u a" "e ued, a

-M ft

0 PERMITTEE NAMEIADRESS (hxh s

Fsdly Nwmtoae IoDom NAME:

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE, IL 60556-5701 FACILTY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXJEN SPEC NATIONAL POLLUTANT OlSCHEIUMINATION SYSTEM (NPDES)

DISCHARGE I l REPORT (OUR)

FRJI PEMT1/11 DISCHARGE NUMBER IMMIDoIYYY I

I

• MIoIYfr FROM 03101/2011 1TO r 03/31=211 0

FQAim i~

OURMiUNbO ZIP CODE:

61010 MAJOR (SUDR 01)

DEMINERALIZER REGENERATE WASTE (0011 Extenat Otft QUANTITY OR LOADING QUALITY OR CONCENTRATION NO.-

,amruny SAMPLE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Zinc. totd (n Z)

SAMPLE 50109 10 PERMIT R...

t 2

MOIL Efluetm Grom REQUIREMENT 300A AVG DAILY NIX Ow GR Flow, in onduit or tT treaLnrm kunt SAMP.E c

MEASUREMENT 0-.0;.3 0- 015

_t K#WfIg RNIA E)(EC..~rN OFI TELEPHON DATEJR LEECTV P~RO TYPED OR PEITED AUTHORM A0EIM COMEINITS AN 6"LANATION OF ANY VIOLATIOW (Riem all aidonsam)*0wo GL EPA Fom 33=4 (X&VAUM ftevimM *AftM MW bf ON&

IIpoep 2

PERMfTIEM NAME/ADORESS (bmndeFaeydWMwamAmUwfD m4, NAME.

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60556-5701 FACULJTY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXJENV SPEC NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPOES)

DSCHOARE MONITORNG REPORT (UR)

PERMIT" NUMER SCARG NUMBER I

DWYYY I

I MDOIYYY FROM 0310112011 TO 03i2O11 OW bpN&d DMR Mailing ZIP CODE:

61010 MAJOR (SUBR 01)

STP PLANT EFFLUENT(FORMER 0018 External Oufd NoODudWWrgsE NO.

FRasmucv SAMPLE PARAMTR QUANTITY OR LOADING QJAUTY OR CONCENTRATION EX O

• ,ML TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS 6o0, 54W. 2 0 d

eg. C S MP LE1.1

_(0 3q o

p c.

003101 0 PERMIT 5.3 10.5 Il 30 60 T1101.

TCice Per Effluenm GrIoI SODA AVG DALY MX 300A AVG DAILY MX COLW24 PH~

SAPL

-,&1o

_)

0o400 1 0 PlpmT

-PERMIT 6

9 TAPr GRPe Effkuent Gross REQUIREMENT MmMUM MAMoMnM GPM SoIds. toal su mp ded SAM PLE 0.1T 0.9_p

?

/

57 0

07 90 V c -

00530 10 POW 5.3 10.5 Id*

30 60 W40L TWO Pr Effaen Gross REQUIEMEN`T 300A AVG DALY MX 300A AVG DAILY MX Flow. In condui or On trambemrd plant SAMP,,E

-4URtErr o. o 0.009

o. O4 Q

35" 04 Efikuent Gross REQUIREMENT I OaMAVGY Dw CONTIN NMAErITW1E PRcIPAL MEXCUTIVE OFFICERE9PO DT

.stD~t~j X

. Adsos o

ik(-3003q

/a AUM OR PION,,W iýiqTNOWimoa8ff coirrsm uo OPn HE, vt-our

."nom* *.j~ms. almm.,u bs)

OL I. FL.*J E s*Det "I'ROUG,4 "TII-5 oumrFALL., t oF 31 TDAYS tL*a,4(, "rA4 E. Mti4T.

1WA FomW 9".

@16)o Psmtsm a"im mbe u"e U

-l RIMP

PERMITTFEW AMEADORESS gfn*A*FbcW~Ne4.~cmowi IWhwvo NAME.

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60555-5701 FACILfTY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT ODSiIEUMINATION SYSTEM (NPOES)

ISCNAuE MOWTUNO REPORT (OUR)

U

,.oo41*3

'1 o

lsu N-0 RO

-31/YYYY

-O0/121 PROM' 03M12011 ITO 03131=211 61010 No 018rg0 D-R NIng ZIP CODE:

MAOR (SUBR 01)

WWTP (FORMER 001C)

Extend Ouft COUMTS8 AND EXPLANATIMI OF ANY VIMLA11WU

-dwgmd W

hnenb)

(3 I.THErAE WAs g ND ISAR GE oF ?AWRCe-SD TF-A A GCE~JA4TEo C06P4 ICAL CLEAMIX6.ASrMWArElt ZeWV& 77JS MoN r,'.

A~. FLoW EXI STED -n4ADUGN rills ourFALL J?; oF 31 IDAYS PDi4/#JG -//C M/-fl7.

ffA Fwm 23010tD*MAh)f vPmsdm

.ainmm" 02rewwzi Pals I

PERWM'TEE NAMWAEA ESS (Lnnte F.~I), NuWaca.ome lant9OW, NAME-EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE, IL 80555-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)

DISCHARGE MONr0NG REPORT (OUR)

PERMIT NUMBER DISHARGQE NUMBER NOWTORMN PERIOD I

-M YYYY I

I MWOYYY FROM 1 0Io,11...

TO 03/31/2011 PcApm~d am "C

UR Malfn ZIP CODE.

MAJOR (SUSR 01)

WWTP (FORMER 001C)

E~dmal Ou~

61010 No DkscAUgsE PARAMETER QUANTITY OR LOADING QUALITY OR CONCENTRATION

.EX OF, M SIM TAMPLE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Zinc. Wd (as Zn)

SAMPLE 5"00 ME.ASURW 0109210 PERMIT 1

2 Effluent Gross RECARIMENT 30DA AVG DALY MX O

WAS

Flow. in conduit or dw treebyw plant SAMPLE

,MEASUENT O._

0.053 0

135" Chi 50050 10 PERM-Efilus.'J Gross REQIREENT UMAVG6

=M&YW03V CN?

WAM~fwnnLE PrNCwVAL E)nCUTIV OwuM=

/

111 TELEP4OME DATE Iet~v I~

MONA umS PRENCIAL WUcuTivE OFFCE Om -A 1WED OR PRINTED AuTmO~WEDaf COMMNTS AND ELARAYON OF ANY VIOlATIONS (RnMGOoh MI 8

A3 l biW)

GL EPA.,~ SSI~t inG.. gm.

my b sas 02U/Ni Amok 5

WA ftm =04 JW Po Lik" odNbm mW be ww&

am-ml 1w Pao 2ý

PERUITTEENNAMEIADIMSS (bik FacmyN&wlamMa

DMrwew, NAME:

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. 1605s-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHELIMINATION SYSTEM (NPOES)

DISCHAR G

REPORT (OUR)

WMMMO I

I MMINDMYYY FROM 0310112011 TO 0313112011 Fam Aspo-DMR MaIlng ZIP CODE:

61010 MAJOR (SUBR 01)

RADWASTE TREATMENT(FORMER 001D EdlemW Ouftl N om 0w mp"-

QUANTITY OR LOADING QUALITY OR CONCENTRATION No.

0 *,*US SAMPLEy VALUE VALUE UNITS VALUE VALUE VALUE UNITS SoftwsswwSAMPLE

-05 5

<o._"

0 a90 (!O

.P MEASUREM_

l 005m 10 PERMIT is 30 mr/

Twim PF Efuen Grss REQUIREMENT 300A AVG DALY UX UomPOS Flow.1noondaorthtvulbnentpanr t

SAMPLE 5-SUEMIT Ro. a 1 5-Ca 50050_0 R

iRM 3e A Y

Effluent Gross REQUI3REMENfT 304MAVG Mr-a ONT9 COMIITS AN EXPLARATION OP ANY VICA=WO (RduWMe 8 alamis~ "

GL.FLOW EX13TF-JD -M4RoU&I4 -THIS our FALL 12 o F 31 DAYS DuRiNjG -n4C AIONr74.

EPA Pmm 3U-1 (RseMiSS) PmIesm aiim mq be u.4 0212W3011 Peel EPA Fwm WN-1 (ftvAl"PmvftW Ild "W66M04 avnml ft"I

PRmnT'E*NAWMED/0ESS (8,,sraiyNn.OC. Dwwz NAME:

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60555-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION:

4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHARGE ELILMNATION SYSTEM (NPOES)

DICAG NO~fOR1111 REPORT (Oli)

ILOOM613 EF1-0 PERMIT &

0BE DISCHARGE NUMBER uMONTRN PERIOD IWMXvW I

I MMIDYY FROM 03/01/2011 TO 03/31/2011 ram AMl oe 11106 DMR MaIling ZIP CODE:

61010 MAJOR (SUBR 01)

STORMWATER (FORMER 001E)

ExtemaI Oufal Noinmcharge-j PARAMETER QUANTITY OR LOADING QUALITY OR CONCENTRATION NO.F FNALY SAMPLE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Souds, tou Sinpald SAMPLE 5)

MEASUREMENT 00530 10 PERMIT 15 30 ML Effluent Gross REQUIREJ.NT 300A AVG DALY MX Wedw WAS Sold, totw suspwmd SAMPLE G* MEASUREMN

/0_/

_-7_

_3_

0030 80 PERMIT 30 100 MWG Ohw Treatment, Pmcess Complete REQUIREMENT 30DA AVG DAILY MX Wwas GRAB Chnomium, hexavelen (as Cr)

SAMPLE MEASUREMENT 01032 1 0 PERMIT

.1

.2 maL Effluent Gross REQUIREMENT 300A AVG DAILY MX IDy GRAB Chromiun, total (as Cr)

SAMP-LE 0103410,MEASUREMENT 1_2 500 0103410 PERMI-T 1

2 mOIL Efuent Gross REQUIREMENT 300A AVG DAILY MX D

GRAB Copper. total (as Cu)

SAMPLE MEASUREMENT__

01042 1 0 PERMIT 5

1 MGRA Efflumt Gross REQUIREMENT 300A AVG DAILY MX Dy GRAB Ironl. total (as Fe)

SAMPLE MAUEET5"00 01045 10 PERMIT I

Eflut Gross REQUIREMENT DALY MX Daily GRAB Lead. toal (as Pb)

SAMPLE 0010MEASUREMENT 2__

.4_

____L

__500 010611 0 PERMIT 0

-VG 2

D.4 UG Efiwe Gross REQUIREMENT 30IA AVG DAmmY MX 3110"aT OPRIMIPAL EXECUMW unwm OR I

Allswmmmos-I coýuiNsOs AI inwsW~io NOTVIOLIIW 110111u ins GL..THNE*C WAS NO VI SC.HA i ZCl -oF: Pvm~owChsseD STEAM GLEAWAmgD C1&E-M1CKL CLEAMfY W4Srca.~rf DUR1'46 ThAI A040A7.

A - FLbW cyIsTED fl4IRWuIi THIS Ot~r.ALL "

qOF -1 D&4YS WgLIv& THCqj Me6#Irol IWA Fem W10.1,9 PrsOa 61111110 ma4be sm" wm*

• arai W Pemll-

0 PERMJTT-E AMEJADDRFESS (hima Fryt Nwatocagm I mp NAME:

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60565.5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 81010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT OLSCKJOIELIMINATION SYSTEM (NPOES)

DISoCroRG REPORT (DR) w E01 i

MONI01 TO PERIOD IMM1OYwDNIMMD'YYY I moty FROM 03/0112011 TO 03/31/2011 0mw lb

-00 DMR Mifling ZIP CODE:

81010 MAJOR (SUSR 01)

STORMWATER (FORMER O01E)

Exwfud Ouftl moowcbdgocpQ MNAME/ILE P ECIALEXWWWFE OWFCa IEEN DATE~d~

_1

&4-uDA~

ORCO COMOMM AND EWLMANAON OF MYT VIOATI00 MS-8

&U~asd~Mmmft 1K 7

o

' 40~Y6aNE SULt.OiIA FIrlf 4WfD oil..5APO~CP~i V-W3icL~~A LA~I~k5Ee#~Ii W*)7fI

~. E~.C cjprrje gvsY'me wAzAt W irgR kAS DIS2Cd/Mcco 7wis Mowri.

EPA Fam 3320-1 (RevMMS Pmtem aibirno be toe@.

02122/21I Pulp 2

a ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 March 2011 Page 1 of 2 MONITORING DATA.-

CWBD CWBD Flow Rock River DATE Temperature CW D

Flow dRFmgd cf 03101/2011 67.0 17.7211200 03102/2011 67.2 13.39 1i,500 03/0312011 66.9 16.96 11.900 03/04/2011 71.9 14.66 11,100 03105/2011 70.0 20.43 12,200 03106/2011 64.8 17.38 13,500 03107/2011 64.0 12.08 12,800 03/08/2011 65.0 17.21 12,000 03/09/2011 63.0 0.71 11l800 03110/2011 66.3 11.73 12,600 03/11/2011 65.7 16.87 12,600 03112/2011 72.2 23.27 12,200 03/13/2011 66.0 9.22 11,600 03114/2011 61.7 16.22 11,200 03/15/2011 61.4 17.23 11,000 03/16/2011 69.7 18.30 10,800 03/17/2011 75.4 14.93 10,700 03118/2011 77.0 18.91 10,500 03119/2011 68.7 18.05 10,400 03(20/2011 71.0 16.30 11,200 03121/2011 73.7 13.39 13,800 03/22/2011 71.9 18.47 14,400 03/23/2011 69.5 15.89 15,100 03124/2011 67.2 19.50 15,900 03t25/2011 66.3 18.89 15,800 03/26/2011 66.0 16.74 15,500 03127/2011 66.7 18.98 15,400 03/28/2011 67.5 11.60 15,200 03/29/2011 67.0 15.03 14,900 03130/2011 68.3 18.96 14,600 03/31/2011 70.0 19.78 14300 K:\\BYRCH\\BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\Mar 2011\\ATTACHOI.doc

ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 March 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rnses) containing hydrazine discharged to the Cooling System Blowdown during the month of March 2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS:

1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.

2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine In this month.

3. Flow existed through this outfall 31 of 31 days.

4. Per Special Condition 24 the influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS values measured were 42.25 mg/L on 03/07/2011 and 7.40 mg/L on 03/14/2011. The CWBD TSS values measured were 54.67 mg(L on 03/07/2011 and 11.29 mg/L on 03/14/2011.

5. Rock River flow for March 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).

6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in March 2011. (Special Condition 15)

K:\\BYR_CH\\BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\201 I Reports\\Mar 201 1\\ATTACHO.doc

Exelon.

Nxelon Generation Company, C ww.exeono,.couclear Byron Station 4450 North German Church Road Byron. IL 61010-9794 May 20, 2011 LTR:

BYRON 2011-0081 File:

2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 SubJect:

Byron Staton Monrly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, Issued January 24,2011, we are submitting the Discharge Monitoring Report for Byron Station, Units 1 and2. This reportoover the period of April 1. 2011 through April 30, 2011.

On 4/1 W20111 during calibration of the flow totalizer for the clean water storage tank discharge of the Wastewate Treatment system, NPDES outfall C01-0, the Instrument Technician determined the transmitter was receiving a higher pressure than what It was scaled to mcelve. The transmitter Is scaled to 3-15 ps1g and was giving an ouput reading of 21 psig. The ansmter feeds kio a square root extractor that Is also scaled to 3-15 pelg. The result is the flow being reported for the Wastewater Treatment system is too low. System Engineering has evaluated the issue and determined an interim corrective action to conservatively address the low reading is to multily the current totalizer readings by a factor of 2. To aid in boublehooti the Issue, a temporary uitrasonic flow detector will be installed on a suitable section of the clean water storage tank pump discharge one. This will allow more accurate anlysis of the actual flow through the clean water storage tank dischrge line. The results of the temporary ultrasonic flow detector will be used to help determine a final solution to this Issue which could include throttling the discharge of the clean water storage tank pumps or changing he discharge line flow oifice size. All actions to address his Issue are tracked in the station's Corrective Action Program. The station's NPDES permit does not limit the amount of clean water storage tank effluent that Is discharged via Oulfall C01 -&; the station Is required to report the amount of flow from Outfall 001-0 on the monthly Discharge Monitoring Report. Outfall C01-0 met all NPDES permit limits for April 2011.

If the are any questions regarding this report, please contact Ms. Zoe Cox, Environmental Specalst, at (815) 4064-035.

Plant Manager Byron Nuclear Generating Station BJA/ZC/ca Attachments

NATIONA. POLLUTANT DISCHARGE EUMINATION SYSTEM (NOFES)

ICHG

-1114 REOR M Rm~

ARVW~

PfM'rt NME/ADORESS (h NFae L000on I wfa NAME' EXELON GENERATION COMPANY LLC ADORESS:

4300 WINFIELD RD WARRENVILLE. IL 80555-4701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4460 NORTI GERMAN CHURC ROAD BYRON.L 81010 ATTN: ZOEY COXEW SPEC F7OiM13 0

cIR J

M~]oaue us

=

NwMMM DMRdiZ W COOE.:

61010 (SUBR 01)

CoOmeNG SYSTEM SLOWDOWN NoDbdkwpsE FROMI om T

Lmmwf QUATIY R LADNOQUAJI

~NO.

Fwmww SAMPLE PARAMEME OR_____

CM E

OF WMAVE TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS T~onowiw 96-5er uI--

.m 157 o 13 5 -

-1 00011 10 PEMT F

~

0T E~w GrossEUtM~ro or 0040010

_9_

_ h2O

/

EfwtOmPERMT a

9 su 801mug SAMPLE 4-

-9_

W 5jsjgt Grs

-~umm 9 MAVG 8 14 ow ON a Grone SAMPLE

__0__

1 L 1 9 0

2 ) L q Q G P PERMI6 10 pUy15 EfhamntGrms ReURM1I SM0AVO DALY MX WisMJ GRAS CtwIdmnw loW(

Cf)

0. 001 1 q 0

oW3 Gk 0103410 PEW nL WA enIJIw ios REUIIaium DALY IJ fai R

SAMP-E1'

--.o 0.012 1q 0 a2'o GrR 0104210 PEMIT T--lGA R~~audtEMEKT DAILY AI Wsb o

Dinc t"W (as Zn)

SAMPLE

_o.

OW O.OoI, 1q 5jQqo Gk 0109 10 ps"R1 1

-A=

sOL iEIfasn Grm

&XAVG WaLy wwx WOO~

mA

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8

PER~frEENAMMADORM. (k*W~t&w~a~f~Ibm NAME EXELON GENERATION COMPANY LLC ADDRES:

4300 INFIELOD RD WARRENVILLE IL 608585401 FACILITY:

EXELON GENERATION CO LLC LOCATI: 440 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATrN: ZOEY COXIENW SPEC NATIONAL POLLUTANT SCK*IUIMINATION SYSTEM (NPOES) 1,O e33 1l 001-0 ummrrum m I m

m m

FROM 04,lft01 TO 04 tl 0t~pa coPam-UR MUling ZIP COOE:

61010 MAJOR (SUOR 01)

COOLING SYSTEM SLOWDOWN E~dms Oudd No ndais QUANTITY OR LOAnmO UALIY COwcENTRAu N0.

mouin SAMPLE PARAMETER EX_____

TY____

______x CM PE VALUE VALUE UNITS VALUE VALUE VALUE UNITS Ox rst t

okuldu SAMIPLE Soo-___

0 34044 10 As ROL RfmI* mobiwi k"b ehiSM SAMPLE 0

MEASUREMNT SooL

~I2 I

~

C.

50060810 paw myla ali Effisnt Goes mEQIlImiffl we&*_

GRAB I_ ___

-o 072 /Z

-A~o Eflbasd Gnos R~tMIIT WANV&S p~tl WO Aacoy Chpima. IoWp~

-eku so MEUWMEN

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ATTACHMENT TO COOUNG SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 Apdl 2011 Page I of 2 MONITORING DATA:

CWBD CWBD Flow Rock River DATE Temperature mgd Flow ftF dem 04/01/2011 71.0 12.51 14,000 04/02/2011 71.0 18.59 13,700 04/03/2011 86.5 14.11 13,300 04/04/2011 86.5 11.61 13,000 04/05,2011 70.8 13.11 12,800 04/06/2011 75.0 16.28 12,500 04/07/2011 72.0 19.61 12,400 04/08/2011 75.0 15.96 12,500 04/09/2011 84.6 15.87 12,700 04/10/2011 85.3 22.12 12,700 04/11/2011 85.3 12.45 12,500 04112/2011 77.0 19.00 12,100 04/13,2011 75.1 16.15 11,700 04/14/2011 78.0 19.80 11,400 04/15/2011 72.5 18.24 11,200 04/16/2011 72.5 16.82 11,600 04/17/2011 70.9 18.07 11,400 04/18/2011 71.0 17.76 11.200 04/1912011 69.1 15.46 11,700 04/20/2011 71.0 16.72 13,500 04/21/2011 71.0 18.42 14,500 04/22/2011 74.4 18.00 14,400 04/23/011 75.8 19.44 14,600 04/24/2011 75.8 19.63 14,600 04r25211 74.6 13.95 14,200 04/26/2011 80.6 14.37 14,500 04/27/2011 80.6 17.14 15,100 04/28/2011 70.7 16.89 15,300 04/29=11 73.0 16.86 14,800 04/3=/2011 78.0 21.98 14,400 K:\\BYRCH\\BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\Apr 2011\\APR 2011 ATTACHOI.doc

ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 April 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of April2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS:

1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.

2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazIne In this month.

3. Flow existed through this outfall30 of 30 days.

4. Per Special Condition 24 the Influent from the Rock River and effluent from Ouffall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value measured was 31.2 mg/I. on 04/04/2011. The CWBD TSS value measured was 4.75 mg/t. on 04/04/2011.

5. Rock River flow for April 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).

6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in April 2011. (Special Condition 15).

K:\\BYRCHBYRON.DB\\CIerk*MonthIy Discharge Monitor Rpt\\2011 Reports\\Apr 201 1\\APR 2011 ATTACHO1.doc

Exelon.

xelon Generation Company, LLC www.exeloncorp.com Nuclear Byron Station

'4450 North German Church Road Byron. IL 61010-9794 June 23, 2011 LTR:

BYRON 2011-0096 File:

2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 S

Subject Byron Station Monthly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, Issued Januay 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units 1 and 2. This report covers the period of May 1, 2011 through May 31, 2011.

Pursuant to Byron Station's NPDES permit, the Station monitors the Total Suspended Solids (TSS) result for Outfall C01 (Wastewater Treatment Plant Effluent) twice per month and sets a 30 mg/L Daily Maximum and 15 mg/L 30-Day Average. On May 5, 2011, the TSS composite sample result for Outfall C01 was 48.4 mg/I and the duplicate result showed 49.2 mg/L. The following day, May 06, 2011, the TSS composite sample result for Outfall C01 was 12.1 mg/L and the duplicate result was 12.9 mg/I The elevated TSS of May 05, 2011, did not endanger health or the environment. Byron Station has been revlewlng potential causes of the elevated TSS at Outfall 001. It is reasonable that the TSS result of May 5e1 may be related to algae growth In the influent water being treated by the Wastewater Treatment Plant (TR). The TR system uses two 30,000 gallon Collection Tanks to collect influent wastewater until enough water is collected to start the TR system process. The TR system also consists of four settling ponds that are located outside the TR facility and these settling ponds also collect Influent wastewater for eventual TR processing. On May 5, 2011, the influent wastewater being processed at TR consisted primarily of TR settling pond water. Since the settling pond water is exposed to outdoor elements, algae appear to have developed In the water, which were too fine for the gravity-fed sand filters to remove from the final effluent. Several actions are being taken to prevent this event from occurring in the future. These include: implementing operating procedure changes to capture past experience for TR water processing, possible use of portable turbidity meter to measure turbidity of the effluent, obtaining a grab sample of TR effluent approximately 2-3 hours after the process is started which is filtered through filter paper to visually ensure suspended solids are low. Also, Byron Station Operations personnel have been directed to Increase the frequency they visually monitor the effluent water quality when the

TR system is running. This event and all actions associated with the event are captured in Byron Station's Corrective Action Program under Issue Report 1212078.

If there am any questions regarding this report, please contact Ms. Zoe Cox, Environmental Specialist, at (815) 406-3035.

Respectfully, Z~dleJ. ~dms; Plant Manager Byron Nuclear Generating Station BJNVZC/ca Attachments 0

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M Ma uo M REPORT (DMU 1,.Wt' am ba.oo POOMTEE K

1. NdAIiaM MAO& Fooft Mmamn conk I UNeW,@I NAME:

EXELON GENERATION COMPANY LLC ADOIESS:

4300 WINFIELD RD WARRENVILLE. IL 60555-701 FACLITY:

EXELON GENERATION CO LLC LOCAT.ON: 4450 NOM GERMAN CHURCH ROAD BYRON, IL 81010 ATTN: ZOEY C0X0EN SPEC mmioi PEROD DUR Milling 23P CODE:

61010 MAJOR (SUSR 01)

STORMWATER RUNOFF BASIN E.ie Outl No DisChmes0 ILwoom Lmxim 0511/211 NO.

-momy SAMPLE PARAMETER QUANTITY OR

_ QUALITY OR CONCENTRATION EX O *Avm VALUE VALUE UNITS VALUE VALUE VALUE UNITS Sdol.

-O VAPxd SAMPLE 0053010 PEOWIT 1

30 weL Eibmnt Goss REQUIRIET 30DAAVO DALY mX Wfdo GRA sdlft low

-opwd SAMPLE 0053060 PERM-30 100 '

OA

ONwTMrsn, Pro1 Complete REQUIRMENT

'AAVO DALY WX WS GR Chomwiu

?mva, l (sw C)

SAMPLE 01032 10 PERIT 7

Al li mot.

ElAft Gros REsUE T

3AAVG DALYMX 0*

GRAB

.,ankmit, bt (w, Cu)

SAMPLU 0103410 PeRMIT.

1 2

mg#.

Eflkwt Gros REQUIAEilNT 3AAVO DALY mm 0*

GRA Capper, low (as Cu)

SAMPLE----

MEA6~mmT 01042 10 PERMIT

-41 EIkuor Gross REQUIREMENT 2DAAVG DALY 0X am Im, to" (s Fe)

SAMPLE 0104510 PERMIT" Efhjsen Gros REQUIREMENT VALYNX am LiA loW (as Pb)

SAP 010511 0 PmaT

.20G Rlai UGross pXMj~j AVGY May"a C C0111ITS A M OUI (W

N 1I N O Y VIOLATII ASld9tSOSt1 1 C. 4 4

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p. io FILE PRo cci7w4,Qwc 5(AVAZ

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g4cLaseD C0O4IAC SYSTMl bWiAJA9 ff w.45v WAS 4ISRICED

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PERWTTENAW*JWC8, 1h, r-Nn

,mhn e

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NAME-EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVILLE. IL 60555-6701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIEWN SPEC t4AT1OWAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)

M0ARG NOWO REPRT-:

UO 1300-INWO~VI f wvWl~

FROM 0500112011 1TO r M112DI1 ram~p-~

-m N&

OUR Mdlig ZIP CODE.:

61010 MAJOR (SUBR 01)

STORMWATER RUNOFF BASIN E*

Out moowdhagem PATOR LOAD QUAITYORCONCENTRATION NO.

Pau.m SAMPLE PARAMETER E_____

_____X OFAMOV.

TYPE VALUE VALUE UNIT$

VALUE VALUE VALUE UNITS NOW wISI (as N)

SAMPLE MEAS 01067 10 PERil a*"

-Ali

.717

.lL EhmWm r

RmUWMEIEfT 3DAAVO DALYWX GRO irc toW (as Zn)

SAMPLE ME__ASURE__-T 01092 10 PEA ff Q&.

EjewtGim ftQIRJpinfl 30D AVG DALY MX owl GRAD Olmidq3UU SAMPLE-aa-02 1 0 PEuIT a

a--

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MEASUMMrr 5006010 P.

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II I

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PERMffTEE NAMEfADORSS (bias Fa~' Nwn~toc~wl&Abwi MAKE EXELON GENERATION COMPANY LLC ADDRESS:

4300 WNFIELD RD WARRENVILLE. IL 60555-6701 FACILITY:

EXELON GENERA11ON CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL. POLLUTANT OISCHAR*JIINATION SYSTEM (NPDES)

DInuum~

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61010 MAJOR (SUBR01)

OEMINERALIZER REGENERATE WASTE (001J Edernam Oudd QUAITY a ~nm ~u~owNO.

-mumy SAMPLE PARAMETER QUANTITY OR____

LODIG_______RONEI(FAT EX OFDJAtLY11 TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS SOWdS toalm suspamded sAlmPL

/. R

-?

10

-EM' 30__

,q o

g5 E

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8 Chvonmkn hsamviMg (as Cr)

SAMPLE 0__

0103210 PERMT mm--.

2 aMO._

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avonkuM, kmd (as C,)

-S-MPL-500~

Elfuer Gross R~URN 30DAAVG DAILYN Oak am Copper, total (ws Cu)

SAMPLE----5 0

01042 10 PERMIT Am m

~

Eflbeit Gross REQUIREMENT 30 V

DALYIA am Iran WWt (as Fe)

SAMPLE 0

01450MEASUREMENT 00-GA Ellieg Gross REQUIEMN

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SAMPLE Soo

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not4 01061 10 PRl!UIR!T 301DAAV DALY MX 0*

GRAB M*

wgI (as NI)

SAMPLE 500 0108ros 10 REQURENT 30DA AVG DALY PAX Oall GRAB emotfwmd4 mdi Gros RQRMM_

r N~lflWLE PRICIAL EXECUTIVE OWSFICE

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I MM I I E NAMUJADDOSS (bubb Faaf DAumatooOM fDONe NAME EXELON GENERATION COMPANY LLC ADDRESS:

4300 WIFELD RD WARRENVILLE. IL 60565-5701 FPACLIT:

EXELON GENERATION CO LLC LCTlON: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 ATTN: ZOEY COXfENV SPEC NATIONAL POLLUTANT DISCHOARGE BJMINATION SYSTEM (NPD)ES) omai mrmmwNwr aRPOT E ILOw13 I

I A01-0 FROMd 050012011 1TO 1 03112011j OUR Mailing 1 CODE:

61010 MAJOR (SUBR 01)

DEMINERALIZER REGENERATE WASTE (001i Exi'Oih Ouhgd pQUATITY OR L Q

OR.CONCE.RATM NX oy SAMLE PARAM11TER EX____

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4300 VtNFIELD RD WARRENVILLE. IL 80555660 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COX/ENV SPEC NATIONAL POLLUTANT OSCHAIRWiNATION SYSTEM (NPDES)

DOCHAF mNOWI&

REPOT *M"J mmmT moa*uUnma FROM 1 50~112011 TO W631011 J.4L awft2004 DUR Mailig P COODE 61010 MAJOR (SUER 01)

SIP PLANT EFFLUENT(FORUER 0016 ExbNngi OutDl PARAMETER QUANTITY OR LOADING QUALITY OR CONCENTRATION NO.

F AN.cT SMYPLE VALUE VALUE UNITS VALUE VALUE VALUE UNITS 00.o day, 2o dq. C SAJMPLE 0,29 alp

&A oq 2X.

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POMMUf NAMEJADSS (knig FPamNm.a4W.n #CAN" NAML EXELON GENERATION COMPANY LLC ADDRESS:

4300 WIFIELD RD WARRENVILLE. IL 60665-5701 FACUJTY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. L 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) mo~fms pm I w wDIYY I -vDWYY FROM 1 5r1i2011 I To 0I O31=011 D MaIhIg W COOD:

MA"O (SUBR 01)

WW"P (FORMER 001C)

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NATIONAL POLLUTANT DISCHAR*IMAlION SYSTEM (NPOES) mCN Mmuo mrwoREPORT (DER cALu PEftnrT NAMJADFrESS g8 F-a I

NAME:-

EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARREJMLLE. IL 8055701 FACIUIY:

EXELON GENERATION CO LLC LOmAIO: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATm: ZOEY COXIEW SPEC IJ E

J0823 I

C0-OUR Malling flP COOE MAJOR (SUOR 01)

WWTP (FORMER 001C)

E.arna OudII 61010 HoObadmprgsE I

amn -raw II FROM 0601i201 ITO r ON3SIPJ0II SJA~fl ORLOflhO o

~no.

Fraumcy SAMPLA PARAMETER,

____R

__________ETRAIO E_____ OF AW.WS I

VALUE VALUE UNITS VALUE VALUE VALUE UNIITS asn. Icia (as Zn)

SAMPLE 5) 01002 10 Pgftgfl 1

-2 EfaimenGins.

REQUIREMENT 30DA AVG DAa.YN I*

GR AS Ra. ~cn~~~wbu0niji04O.'

7 0.09.2C 0

1

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PMUTTEE NAME/ADORESS ONO#* FmW, muai, IOes NAME:

EXELON GENERATION COMPANY LLC MDOREIS:

4300 WIFIELD RD WAFF3VIlf-IL 60555-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON, IL 61010 AT*N: ZOEY COXJEV SPEC NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPES) 13 001-0 PERWT NDCNARGRE NUMBER om6olol I

Io 08m1w/

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61010 MAJOR (SUBR 01)

RADWASTE TREATMENT(FORMER 001D Eoflhch~ugs 1.0MWG

~j~y

~No.

PRESimyC WMPL PARAMETER a___ A_____

OR_____

EX_

aAWNW-YM TYPE VALUE VALUE UNtom VALUE VALUE VALUE UNIT$

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FE*Ar'E NWAMEJOFSS fb (bxFo

)vam NAnstorn, IgAbm, NAME' EXELON GENERATION COMPANY LLC ADDRESS:

4300 WINFIELD RD WARRENVLLE. IL 60566-5701 FACIULTY:

EXELON GENERATION CO LLC LOCAllON: 44"0 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTN: ZOEY COXIENV SPEC NATIONAL POLU.tAI4T OISCARCINATIONd SYSTEM (NPOES)

DISCHARE MOIT01 IIMWR DWIR)W FROM OwliniOl TO 0"I31m01 OSSMew OUR Mdtg ZIP CODE:

61010 MAMO (SUER 01)

STORMWATER (FORMER 001E)

Fdernal Ouslcl QUANTIY OR LOADOSQUALTY OR ONCENSAMPLEO

-AAEE E_____

I_____

BIT____

OMUY VALUE VALUE UNITS VALUE VALUE VALUE UNITS Sado, to SAMPLE----

MEABUREONT 00310 PRMITr 15 30 AW..

haa.t Gross m~aumga 04V DALY aU.YXVi" 00w80POW

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SAM101---

5C 010M210 PERMT 1.2 g.

Eawart Gross Rluxuam WMAN DALYNX Gaw Chronim. total (ws Cr)

SAMPLE---

MEASURRW

_500 01034 10 PERM.

-2

1.

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SAMPLE 0

01042 10 PEMIT

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GA ban. tota (as Fe)

&AMPLE "0-0104610 p-~

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SAM-L-01051 10 POW

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~

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)

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NAMAE EXELON GENERATION COMPANY LLC ADORESS:

4300 WINFIELD RD WARRENVILLE. IL 60555-5701 FACILITY:

EXELON GENERATION CO LLC LOCATION: 4450 NORTH GERMAN CHURCH ROAD BYRON. IL 61010 ATTNI: ZOEY COXIENV SPEC I L 00431 I I 01-I~

mum PM AMI 10ARENU OUR.MaIlingPCODE 61010 MAJOR (SUBR 01)

STORMWATER (FORMER 01 E)

Extemaol Oulftl E~Nmd CubS FROM

,mrZ l I TOLID~fI1 PARMETR UA~LN OR LOADING QUALITY OR CONCENTRANON No.

nuomcv SAMPLE VALUJE VALUE UNITS VALUE VALUE VALUE UNITS N~icks. loa (as NI)

SAMPLE 5)

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V DAJLY WXi GA

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Zn 500 0100210 PERW 1I 2GRAB E~m Gross RQIENf 0AAG DL XDf P

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0 02WLI1 WIN 2

ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 May 2011 Page 1 of 2 MONITORING DATA:

CWBD Rock River DATE Temperature CWBD lowFlow dt IF mgde 05/01/2011 78.4 17.11 14,100 05/02/2011 74.0 13.24 13,500 05/03/2011 67.0 18.32 13,100 05/04/2011 66.3 15.34 12,800 05/05/2011 70.5 16.58 12,400 05/06/2011 77.0 17.91 12,000 05107/2011 81.0 23.47 11600 05/08 11 74.5 19.62 11,400 05/09/2011 80.7 15.61 11,000 0511012011 83.6 21.16 10.900 05/11/2011 92.0 17.02 10,600 05/1212011 86.7 19.21 10,400 05/13211 88.8 19.16 10.400 05/142011 80.6 23.66 11500 05/15/2011 77.9 19.45 11,500 05/16/2011 73.5 14.51 11300 05/17/2011 74.0 21.29 10,600 05/18/2011 75.6 18.80 9,990 05/19/2011 79.5 20.33 9,620 05/20/2011 83.0 19.99 9,280 05/21/2011 84.7 22.65 8,970 05/22/2011 78.6 19.20 8,910 05/23/2011 77.3 20.03 11,100 05/24/2011 77.0 24.28 10,700 05/25/2011 76.0 19.07 10.400 05/26/2011 66.0 23.22 11,100 05/27/2011 73.4 21.42 11,600 05/28/2011 77.6 30.76 11,400 05/29/2011 82.7 20.14 11100 05/30/2011 88.0 17.17 12,800 05/31/2011 90.7 19.48 13,100 K:\\BYR_C-BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\MAY 2011 ATrACHOI.doc

ATTACHMENT TO COOUNG SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 May 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of May 2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS:

1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.

2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.

3. Flow existed through this outfall 31 of 31 days.

4. Per Special Condition 24 the Influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value measured was 49.6 mg/L on 05/02/2011. The CWBD TSS value measured was 2.6 mg/L on 05/02/2011.

5. Rock River flow for May 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).

6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in May 2011. (Special Condition 15).

6 K:\\BYRCHlBYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\MAY 2011 AIWACH01.doc

Exelkn..

Exelon Generation Company, LLC www.exeloncorp.com Nuclear Byron Station 44S0 North German Church Road Byron, IL 61010-9794 July 18, 2011 LTR:

BYRON 2011-0104 File:

2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, issued January 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units I and 2. This report covers the period of June 1,2011 through June 30, 2011.

If there are any questions regarding this report, please contact Ms. Zoe Cox, Environmental Specialist, at (815) 406-3035.

Respectfully, Bradley J. Adams Plant Manager Byron Nuclear Generating Station BJN/ZC/ca Attachments

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ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 June 2011 Page 1 of 2 MONITORING DATA:

CWBD CWBD Flow Rock River DATE Temperature mgd Foow dogIF dfe 06/01/2011 91.7 22.02 12,200 06/0212011 86.2 21.55 11,600 06/03/2011 85.2 22.27 10,300 06/04/2011 94.8 28.32 81960 06/05/2011 92.3 27.52 8,130 06/06/2011 92.5 12.72 7,680 06/07/2011 94.4 23.46 7,300 06/08/2011 94.1 18.60 6,910 06/09/2011 93.1 24.10 7,650 06/10/2011 86.1 18.13 9,790 06/11/2011 81.3 31.27 10.500 06/12/2011 82.2 22.67 10,600 06/13/2011 84.7 14.79 10,200 06/14/2011 84.7 22.77 9,090 06/15/2011 84.0 21.13 8,470 06/16/2011 86.4 21.67 8,760 06/17/2011 89.0 22.55 7,980 06/18/2011 89.0 28.05 7,480 06/19/2011 90.8 22.85 7,200 06/20/2011 90.8 17.15 6,970 06/21/2011 91.8 24.70 6,900 06/22/2011 91.8 21.02 6,980 06/23/2011 85.9 24.02 7,040 06/24/2011 84.3 20.50 6,950 06/25/2011 87.4 28.62 6,880 06/26/2011 88.3 22.40 6,650 06/27/2011 89.0 16.61 6,480 06/28/2011 89.0 23.93 6,180 06/29/2011 86.0 20.89 6,070 06/30/2011 94.0 22.30 5,990 S

K:\\BYRCH\\BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports&une 2011Uune 2011 ATTACHO1.doc

ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 June 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of June 2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS:

1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.

2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.

3. Flow existed through this outfall 30 of 30 days.

4. Per Special Condition 24 the influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 67.5 mg/I on 06/06/2011 and was 10.4 mg/l on 06/13/2011. The CWBD TSS value was 17.0 mg/L on 06/06/2011 and was 33.6 mg/L on 06/13/2011.

5. Rock River flow for June 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).

6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in June 2011. (Special Condition 15).

K:ABYRCH\\BYRON.DB\\C1erk\\Monthly Discharge Monitor Rpt\\201 1 ReportsJune 201 1une 2011 ATTACHO1.doc

u Exelon.

Gxelon Gereation Company, LtC www.exeloncornpcom Nuclear Byron Station 4450 North German Church Road Byron, I1 61010-9794 August 22, 2011 LTR:

BYRON 2011-0117 File:

2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number 1L0048313, issued January 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units 1 and 2. This report covers the period of July 1o2011 through July 31, 2011.

If there are any questions regarding this report, please contact Ms. Zoo Cox, Environmental Specialist, at (815) 406.3035.

Respectfully, Brdley

. Adams Plant Manager Byron Nuclear Generating Station BJANZC/ca Attachments

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ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 July 2011 Page 1 of 2 MONITORING DATA:

CWBD Rock River DATE Temperature mC d Flow dogIF cla 07/01/2011 95.0 24.50 5,790 07/02/2011 96.0 26.75 5,630 07/03/2011 96.0 22.65 5,480 07/04/2011 89.3 15.41 5,370 07/05/2011 89.7 26.22 5,230 07/06/2011 91.5 21.39 5,010 07/07/2011 91.5 23.37 4,870 07/08/2011 90.8 19.74 4,800 07/09/2011 93.3 31.51 4,660 07/10/2011 94.1 21.98 4,450 07/11/2011 94.1 17.86 4,500 07/12/2011 94.0 20.80 4,370 07/13/2011 91.4 24.16 4,390 07/14/2011 85.7 19.22 4,340 07/15/2011 90.0 25.55 4,100 07/16/2011 91.7 25.80 3,950 07/17/2011 97.6 20.44 3,720 07/18/2011 97.6 18.86 3,680 07/19/2011 99.1 22.45 3,590 07/20/2011 97.7 23.16 3,560 07/21/2011 97.7 25.09 3,460 07/22/2011 95.5 20.60 3,930 07/23/2011 94.0 23.36 4,790 07/24/2011 94.6 19.42

.. 5,520 07/25/2011 93.1 24.33 5,490 07/26/2011 93.7 24.01 5,360 07/27/2011 93.7 20.95 5,200 07/28/2011 92.9 22.68 6,750 07/29/2011 93.4 22.99 8,120 07/30/2011 93.3 31.02 7,960 07/31/2011 94.6 20.09 7,600 K:\\BYRCH\\BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\201 1 ReportsUuly 201 l'July 2011 ATTACHO1.doc

ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 July 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of July 2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS:

1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.

2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.

3. Flow existed through this outfall 31 of 31 days.

4. Per Special Condition 24 the influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 59.0 mg/I on 07/04/2011. The CWBD TSS value was 4.2 mg/L on 07/04/2011.

5. Rock River flow for July 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).

6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in July 2011. (Special Condition 15).

K:\\BYR_CHMBYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\July 201 1Uuly 2011 ATTACHO0.doc

• 'Exelkn.

Exelon Generation Company, LLC www.exeloncorp.com Byron Station 4450 North German Church Road Byron, IL 61010-9794 September 23, 2011 LTR:

BYRON 2011-0135 File:

2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, Issued January 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units I and 2. This report covers the period of August 1,2011 through August 31.2011.

If there are any questions regarding this report, please contact Ms..Zoe Cox, Environmental Specialist, at (815) 406-3035.

Respectfully, Br adl 4

. Adams Plant Manager Byron Nuclear Generating Station BJA/ZC/vb Attachments

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ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 August 2011 Page 1 of 2 MONITORING DATA:

WBD C WBD Flow Rock River DATE Temperature mgd Flow dog IF er 08/01/2011 94.8 16.77 7360 08/02/2011 95.8 25.15 7420 08/03/2011 95.8 20.21 7680 08/04/2011 94.0 22.96 7980 08/05/2011 92.0 21.77 7610 08/06/2011 92.0 30.56 6830 08/07/2011 95.0 21.64 5780 08/08/2011 95.0 16.44 5030 08/09/2011 92.2 23.63 5040 08/10/2011 88.4 21.05 4800 08/11/2011 86.0 22.50 4700 08/12/2011 88.3 22.68 4500 08/13/2011 91.3 28.84 4710 08/14/2011 91.3 22.30 5450 08/15/2011 87.5 18.18 4960 08/16/2011 89.7 21.87 4460 08/17/2011 89.7 22.72 4220 08/18/2011 90.8 22.26 4050 08/19/2011 90.8 22.88 3920 08/20/2011 92.4 28.02 3920 08/21/2011 89.0 22.11 4110 08/22/2011 88.3 16.40 4190 08/23/2011 92.2 22.98 4400 08/24/2011 95.7 20.52 4810 08/25/2011 95.7 23.90 4840 08/26/2011 90.0 22.49 4490 08/27/2011 90.6 26.06 4220 08/28/2011 89.8 25.45 3940 08/29/2011 87.4 15.34 3810 08/30/2011 89.8 22.43 3640 08/31/2011 92.0 21.54 3600 K:ABYRSH\\BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\August 201 I\\August 2011 ATTACH01.doc

ATTACHMENT TO COOUNG SYSTEM BLOWDOWN (Outfall 001-0)

DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 August 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of August 2011.

TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS:

I. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.

2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.

3. Flow existed through this outfall 31 of 31 days.

4. Per Special Condition 24 the influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 25.3 mg/L on 08/01/2011 and was 20.0 mg/L on 08/22/11. The CWBD TSS value was 11.4 mg/L on 08/01/2011 and was 28.0 mg/L on 08/22/11.

5. Rock River flow for August 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).

6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in August 2011. (Special Condition 15).

K:\\BYR_CH\\BYRON.DB\\Clerk\\Monthly Discharge Monitor Rpt\\2011 Reports\\August 2011 \\August 2011 ATTACHO.doc