ML20003G177

NPDS Permit Mn 0004006,issued to Northern States Power Co

ML20003G177
Person / Time
Site:	Prairie Island
Issue date:	01/19/1981
From:	Schade B ENVIRONMENTAL PROTECTION AGENCY
To:
Shared Package
ML20003G170	List: ML20003G169 ML20003G175 ML20003G177
References
MN-0004006, MN-4006, NUDOCS 8104280429
Download: ML20003G177 (34)

Text

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• ,U' (f Page 1 of 33

,. Permit No: MN 0004006 AUTHORIZATION TO DISCHARGE AND CONSTRUCT WASTEWATER TREATMENT FACILITIES UNDER T$E flATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM AND STATE DISPOSAL SYSTEM PERMIT PROGRAM In compliance with the provisions of the Federal !4ater Pollution Control Act, as amended, (33 U.S.C.1251 et sea; hereinafter the "Act"), Minnesota Statutes Chapters 115 and 116 es amended and flinnesota ?ollution Control Acency Regulation WPC 36 (hereinafter Agency Regulation WPC 36)

NORTHERN STATES POWER COMPANY is authorized by the Minnesota Pollution Control Agency, to construct and operate wastewater treatment facilities and/or to discharge from Prairie Island Nuclear Generating Plant Welch, Minnesota to receiving water named ttle Mississippi River in accordance with effluent limitations, monitoring requirements and other conditions set forth in Parts I and II, hereof.

This permit shall become effective on the date of issuance by the Director.

This permit and the authorization to discharge shall expire at midnicht, June 30, 1985 . The Permittee is not authorized to discharce after the above date of expiration. In order to receive authorization to discharge beyond the above date of expiration, the Permittee shall submit such information and forms as are required by the Agency no later than 180 days prior to the above date of expiration pursuant to Agency Regulation WPC 1 l

Barr C. Schade Di ctor Division of Water Quality Date: JAN 191981 For Terry Hoffman Executive Director "innesota ocliution Control Acency

Rev.12-la-79(141538) g10 4 28N

PART 1

- Page 2 of 33

,. Permit No: MN 0004006 A. DESCRIPTIO'l This facility is a two unit nuclear fueled steam electric generating plant us-ing a-pressurized water reactor system with a maximum generating capacity of 1,120 megawatts. The disposal system consists of cooling towers, a chemical treatment system, a radwaste treatment system, pumps and piping. Steam genera-tor blowdown and radwaste effluent are discharged via discharge serial numbers 20101 and 20102, respectively, into the circulating water system. Neutralizer tank effluent and resin rinse water are discharged to the circulating water system via outfall serial number 20103. Unit 1 and Unit 2 turbine building sumps composed of non-contact cooling water, condensate traps and drains, resin

-inse overflow and roof and floor drains are discharged into the circulating water system via cutfall serial numbers 20104 and 20105, respectively. Metal cleaning water is dischc-ged from outfall seria'. ~. der 20106 into the circulating water system. Units 1 and 2 condensate c:cw-down are discharged into the circulating water system .ia outfall serial numbers 20107 and 20108, respectively. Mis-cellaneous plant building floor drains are discharged into the circulating water system via outfall 20109. Heating system blewdown is discharged into the circulating water system via the Unit I turbine building sump through outfall number 20110. The circulating water system composed of condenser cooling water, plant cooling water and discharges 20101 through 20110 discharges to the Miss-issippi River via outfall serial number 20100. During icing conditions, addit-fonal circulating water is discharged from outfall 20200 into the backwater slough south of the discharge. After completion of the intake modifications as described in Part I.C.6. and Part I.F.1. of this pennit, screen backwash and fish return water will be discharged from outfall 20300. The discharges at this facility are characterized as follows:

Discharge Maximum Typical Serial Number Tyce of Wastewater Flow Flow ,,

20100 Circulating Cooling Water, Condenser Cooling Water 892 MGD 716 MGD Plant Cooling Water 44 MGD 23 MGD 20101 Steam Generator Slowdown 250,000 gpd 25,000 spd 20102 Radwaste Treatment System Effluent 50,000 gpd 3,000 gpd 20103 Neutralizer Tank Effluent 100,000 gpd 55,000 spd and Resin Rinse Water 20104, 20105 Unit 1 and 2 Turbine 520,000 spd 200,000 spd i Building Sumo 20106 Metal Cleaning Water 5,000 gpd 0 gpd 20107, 20108 Unit 1 and 2 Condensate Blowdown 250,000 gpd 25,00) gpd 20109 Miscellaneous Plant Building Floor Drains l

PART I Page 3 of 33 -

Pemit 'lo: MN CCC4CC6 A. CESCRIPTICN (cen't)

Discharge Maximum Typical Serial 'tumber Tvee cf Wastewater _ Flow Ficw 20110 Heating Systam 31cwdcwn 30,0C0 g;d 0 spd 20200 Sackwater 51cugh Deicing Water 1.5 MGD 1.5 NO 20300 Screen Backwash and Fish Return Effluent 3.2'50 2.0 MGD d

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Page 4 of 33 -

Permit No: MN0004006 ,

)

. PART I

' B. EFFtUENT LIMITATIONS AND MONITORING REQUIREMENTS i 1. During the period beginning on the effective date of this Permit and lasting until June 30, 1985 the Permittee

! is authorized to discharge circulating cooling water, plant cooling water, and miscellaneous waste streams from

'. outfall serial number 20100.

Such discharges shall be limited and nonitored by the Permittee as specified below:

, EfftUENT CllARACTERISTIC DISCilARGE LIMITATIONS MONITOR:";G REQUIREMENTS Lg/ day (1bs/ day) Other Units (specify)

Thirty (30) Thirty (30)

. Consecutive Consecutive Heasurement Sample

Day Average Daily Max Day Average Dail & Frequency _ Type Flow-m3/ Day (MGD) - - - -

Continuous -

Temperature OC(OF) - See page 17 of 33 -

Continuous * -

, Chlorine (Total Residual) Not to exceed 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> / day 0.2 mg/l bi-weekly ** Grab Plant Capacity Factor-Percent Total Capacity - - - -

Monthly Average -

, The Pennittee shall monitor the amount and time of chlorine application daily and report it monthly along with other 1 monitoring reports. Chlorine may only be used in the plant cooling water, except chlorine may be used in the circul-ating cooling water periodically to treat the parasitic amoeba provided the circulating cooling water is dechlorinated prior to discharge.

The pil shall not be less than 6.5 nor greater than 8.5. These upper and lower limitations are not subject to averag-Ing and shall be net at all tines.

The pil shall be nonitored at the intake and discharge and sampled by weekly grab samples.

There shall be no discharge of floating solids or visible foam except that which occurs naturally in the river in other than trace anounts.

The discharge shall not contain oil or other substances in annunts sufficient to create a visible color film on the surface of the receiving waters.

Sanples taken in compliance with the nonitoring requirements specified above shasl be taken at a point representative of the discharge.

' Intake & Olscharge

• • The daily total annunt of chlorine used in the plant cooling water shall not exceed 100 pounds. This application rate does not apply to periodic chlorination for the parasitic amoeba.

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i Page 5 of 33 l l

PermiL No: HN0004006 i l ,

', B. Ef tLUENI llHi1All0FS AND HONil0 RING Nt()tilRtHIN1 [

,

• i

! 2. Ikaring the period beginning on the effective date of this permit end lasting until June 30,19tl5 j the permittee is authorizeal to disclearge steam gelierator lilowdown f roni outf all serial riumlier 20101. i 1 .

! Such discharges shall be limited and snonttored by the Permittee as specified below:  ;

i

] ff flufHT CilARACHRISilC DISCliARGE l.lHITATIONS HON 110 RING R[()UlpfMENTS lig/ day (lbs/ day) OtherUnits(specify)

Thirty (30) Thirty (30) i Consecutive Consecutive Measureasent Sampic

! Day Average Daily Max Day _ Average Daily Ham Fre.luency Type _

flow-ad/ Day (HGD) - - - -

Montlily Hally Average Estimate lotal Suspended Solids

• Ell.4 (62.6) 94.6(208.6) 30 mg/l 100 muj/l Monthly Grab

. Turbidity - - -

25 Nill Honthly Grali i

I ll The discharge shall not contain oil or other substances in asiounts sufficient to create a visible color film on the surface of the receiving waters. .

Scmples taken in compliance with the aionttoring requirements specified above shall lie taken at a point representative of the discharge prior to mixing with other waste streams.

a lli additlosi to the sminithly avesage asid daily ainaxliiiimi limitatlosis, tile sevest (?) coilsecutive day average concen-trattori shall not exceed 45 mg/l. -

(6/79)164496 ,

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f of Page' 33 ,

Permit No: MN0004006 PART I s

i D. EFFLUENT LIMITATIONS AND t10NITORING REQUIREMENTS

3. During the period beginning on the effective date of this permit and lasting until June 30, 1985 the Pennittee is authorized to discharge radwaste treatment effluent from outfall serial number 20102.

l Such discharges shall be limited and monitored by the Permittee as specified below:

1 EFFLUENT CllARACTERISTIC DISCllARGE LIMITATIONS MONITORING REQUIREMENTS _

kg/ day (lbs/ day) Other Units (specify)

Thirty (30) Thirty (30)

Consecutive Consecutive Measurement Sample i

_ Day _ Averaue Daily Max Day Average Daily Max Frequency Type Flow-m3/ day (MGD) - - - - Monithly Daily Average Estimate Total Suspended Solids

• 5.7 (12,5) 18.9 (41.7) 30 pj/1 190 mg/l Monthly Grab Turbidity - - -

25 NTU Monthly Grab The discharge shall not contain oil or other substances in amounts sufficient to create a visible color film on the surface of the receiving waters.

Samples taken in compliance with the monitoring requirements specified above shall be taken at a point representa-Live of the discharge prior to mixing with other streams.

'In addition to the monthly average and daily maximum limitations, the seven (7) consecutive day average concentraticn-shall not exceed 45 mg/l.

g Page 7 of 33 Permit No: HN0004006 l PART I

8. EFFLUENT LIMITATIONS ANil HON 110 RING'REQUIRfhfMIS I.

4. 1 9112 During the period the Permittee beginningtoon is authorized discharge the effective date oftasil neutralizer thiseffluesit permit dead and lasting resin rinse until water llay 31,v rom outfall serial nunber 20103.

Such discharges shall be limited and monitored by the Perinttlee as specified below:

EffillENT CilARACifRISTIC DISCliARCE LlHITATIONS HONI10RINC: REQUIMfMLNIS kg/ day (lbs/ day) Other Units (specify)

Ihlrty (30) Thirty (30)

I Consecutive Consecutive Measurement Sample

! Day Average Daily _Hav Day _ Average _ llally Max frequency lyg Flow-WI / Day (HGD) - - - - hi-Weekly Daily Average Estimate total Suspended Solids - - - - bi-Weekly Grab lurbidity - - - - bl-Weekly Grah I

The discharge shall not contain oil or other substances in amounts sufficient to create a visible color flim on the surface of the receiving waters. .

Semples taken in compliance with the monitoring requirements specified above shall be taken at a guilnt represesitative ut the discliarge girlor to siilxiiig wills other waste streassis.

(6/79)164496 ,  ;

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Page a of 33 'I Permit No: HN0004006 PART I i i l B. EFFLUENT LIMITAT10 TIS AND MONITORING REQUIREMENTS l s

l l S. During the period beginning on June 1, 1982 and lasting until June 30, li a 3 the Perwittee is authorized to discharge neutralizer tank effluent and resin rinse water from outfall serial i*

number 20103. .

Such discharges shall be limited and monitored by the Permittee as specified below: i EFFLUENT CilARACTERISTIC DIScilARGE LIMITATIONS MONITORING REQUIREMENTS l

! kg/ day (lbs/ day) Other Units (specify) l I

Thirty (30) Thirty (30)

Consecutive Consecutive Measurement Sample Day Average Daily Max D_ay Average Daily Max Frequency hpe Flow-si8/ Day (MGO) - - - -

bi-Weekly Daily Average Estimate Total Suspended Solids

• 11.4 (25.0) 37.9 (83.5) 30 mg/l 100 mg/l hi-Weekly Grab Tubidity - - -

25 NTU bi-Weekly Grab The discharge shall not contain oil or other substances in amounts sufficient to create a visible color film on I the surface of the receiving waters. .

Samples taken in compliance with the monitoring requirement specified above shall be taken at a point represen-  !

tative of the discharge prior to mixing with other waste streams.

• In.additon to the monthly avera t ration shall not exceed 4d wj/1.ge and daily maxi aum limitations, the seven (7) consecutive day average concent-(6/79) 164496

Page gaf 33 .

Permit No: HH0004006 I

PAHI I I  :

i 11 . EffluENi t.lHITATIONS AND MONIIDHING NfQUlHtHfMIS .

i j  ! 6. Ibring tiie period beginning on the ef fective date of this Penuit and lasting uutti June 30. 1985 the Pennittee i is ainthorized to discharge Unit I and Unit 2 turbine liullding staqi effluent congirlsed of

resin rinse overflow, condensate traps and drains, roof and floor dralais acid non-contact cooling water j from outftll serial numbers 20104 and 20105, respectively.

\ '

Such disclidrges sliall be limited acid as)iillored by tiie Permittee as specified below:

fIfIUlNI CilAkACTEHIS[IC_ lliSCalANGE IIMIIAIIONS HONIIDHING HD)UlHIMINIS

- kg/ day (Ibs/ day) Other Units (Specify)

Thirty (30) Thirty (30)

Consecutive Consecutive Measurement Sangile a liay Average lla ljy_H,ix flay Avera3e Daily Max frequency r _ Type flow-m3/Ilay (HGD) - - - - Weekly Daily Average Estimate Total Suspended Solids

• 30 mg/l 100;ag/l Weekly Grah Turbidity - - -

25 NIH Weekly Grah 011 acid Grease 10 siaq/l 15 mg/l Monthly Grah l

?

1here shall be sio discliarge of t'soatteig solids or visthle foam except that wlitcli occurs viaturally lei the river in other than trace anu>unts.

Ilie discharge stiall siot cositaisi oil or otlier substasices ist amousits sufficle sit to create a visthle color film on t'.ie surface of the receivisig waters.

Sangiles takeni in congillance wille line usotiltoring requiremesits specified above shall lie taken at a poisit represen-tative of the discleatge girlor to isilxisig willi otlier waste stecans. Sangiles shall be taken at each outfall.

sinaximinosi limitatiosis, time seven 7) cosisecutive day aves age cosi-

• lei additto,i centrationi to riot sliall tiie exceed seiosittily 45aven'aue asid tdall{ie backgrounid level of line natura(i origin is reasosiably definable aus/1. Wiiere i diid siolliially is higher tiian tiie specified ilmits for total suspended solids the naturai level siia> he used as the limit. ,

Page 10or 33 ., .

Permit No: MN 0004006 -

PART I B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS a

7. During the period beginning on the effective date of this permit and lasting until June 30, 1985 the Permittee is authorized to discharge from outfall serial number 20106 metal cleaaing water.

Such discharges shall be limited and monitored by the Permitiee as specified below:

EFFLUENT CllARACTERISTIC DIScilARGE LIMITATIONS MONITORING REQUIREMENTS kg/ day (1bs/d.1y) Other Units (specify)

Thirty (30) Thirty (30)

Consecutive Consecutive Measurenent Sanple Day Average Daily My Day Average DailyJ1q frequency Type 3

Daily A m age flow-m / Day (MGD) - - - -

once per Estimate Iron 02(.04) .02 .04) 1.0 ng/l 1.0 ng/l batch Grab Copper .02(.04) .02 .04)- 1.0 ng/l 1.0 ng/l discharge Grab Total Suspended Solids

• 0.6(1.3) 1.94.2) 30 ng/l 100 ng/l Grab 011 and Grease 0.2(0.4) 0.3 0.6) 10 ng/l 15 ug/l Grab The discharge shall not contain oil or other substances in anounts sufficient to create a sisible color film on the surface of the receiving waters.

Sanples taken in coupliance with the nonitoring requirements specified above shall be taken at the following location: at a point representative of the discharge prior to mixing with othe. waste streams.

'In addition to the nonthly average and daily maxinitmi limitations, the seven(7) consecutive day average con-centration shall not exceed 45 mg/1.

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Page 11 of 33 I

Permit No: HN0004006 PARI I

]

l

8. EFFLUENT LIMITAllokS AND MONITORING REI)Ull4LHENTS 1 , .

8. During the period beginning on the effectlye date of tiils permit and lasting ungil June 30, 1985 i

i the andPermittee is authorized to dischartie Unit I and Unit 2 condensate blowdown arom outra11 serial numbers 20107 20106, respectively.

Such discharges shall be Ilmited and monitored by the Permittee as specified below:

EfflufNT CilARACTERISTIC DISCilARGE LIMITATIONS HONITORING REQUIREMENTS i

, lig/ day (lbs/ day) OtherUnit4(specify) 1 j 1hlrty (30 Thirty (30)

Cupsecutive) Consecu'ive Measurement Sample f Day Average DaQyMax Day Avera g Daily Max frequency Tyg Flow-ad/ Day (NGD) - - - -

Ikinttily Daily Average Estimate Total Suspended Solids

• 28.4(62.6) 94.6(208.6) 30 au,3/1 100 mig /l ibnthly Grab-

! Turbidity - - -

25 NIU ibnthly Grab l i

~

! I The mass discharge limitations apply to the conibleiation of discharges from outfalls 20107 and 20108. The  : (

.l . concentration limitations apply to discliarges 20107 and 20108 separately. Sangiles shall be taken at eac!. outfall. il 1

i The discharge shall not contain oil or other substances in amounts sufficient to create a visible color film on the surface of the receiving waters. .

ted above steall be taken at the following Semples location- taken in compilance at a poliit with the represesitative monitoring of the requirements discliarge prior to asixspecl{sig wills allier waste streams.

• In additosi to the monittily average arid daily nuximum limitatiosis, tise sevest (7) cosisecutive day average cosi-centration sliall slot exceed 45 mg/l. -

. Page 12 or 33 ,

l Peralt No: MN0004006 PART I

[

, il1, B. EFFLUENT LIMITATIONS AND MONITORING' REQUIREMENTS 4 ,

9. 1985 j

i l' During the period the Permittee beginning to is authorized ondischarge the effective date of this permit miscellaneous and drains plant floor lasting from until outfall June 30{al ser number 20109.

Such discharges shall be limited and monitored by the Permittee as specified below:

EFFLUENT CHARACTERISTIC DISCHARGE LlH:TATIONS f MONITORING REQUIREMENTS 1

9 kg/ day (1bs/ day) OtherUnits(specify) i 4 Thirty (30) Thirty (30)

.  ; Consecutive Consecutive Measurement Sample Day Average Daily Max Day Average _ Daily Max Frequency Type

. FlowM/ Day (MGO) - - - -

Quarterly Estimate

, Total Suspended Solids * - -

30 mg/l 100 ng/l Quarterly Grab Cil and Grease - -

10 mg/l 15 mg/l Guarterly Grab i

• In addition to the monthly average and daily maximum limitations, the seven(7) consecutive day average con-g centration shall not exceed 45 mg/1.

I e

l The discharge shall not contain oil or other substances in amounts sufficient to create a visible color film on the surface of the receiving waters. .

Semples taken in compliance with the monitoring requirements specified above shall be taken at a point represen-tative of the discharge prior 'o mixing with other waste streams.

(6/79)164496

l'asje 13 of 33 PcrmiL No: HN 0004006 PAkl i II. ifftllLNI LlHITAll0NS ANil MONil0 RING Rt()ulHfHfNIS .

10. During the period lieglanning on tiie effective date of tiils perinit aged lastisig unitti . lune 30, 1905 the Penni ttee is autlion ized to discliarge ficallsig systein filowdows frous discliarge serial nimilier 20110.

Such discliarges shall lie limited and monitored l>y tiie Permittee as specified fielow:

IIIIIllNI glAHA,QfHiSTlC DlSCilAHGE I.lHIIATIONS ,HONI1014ING Nff)UlHIMfNIS kg/ day (lbs/ day) Ollie: lleilts (sliccify)

Ihlrty (30) Thirty (30)

Consecutive Consecutive K 6urement Sample llay Average _ llally Ha MJgg I Daily _K3 frcoluency _ lysse flow-m / Day (HGil) - - - -

llontlity Daily Average Ls t is.ia te Total Suspended Solids

• 9.1 (20.0) 30.3 (66.8) 30 wj/l 100 m.1/1 Monthly Grale lurbidity - - -

2f> Hlu Monthly Grab alsi addition to the w)nttily average asid daily maxiumme lluiltations tlie seven (?) consecutive day average concentration sliall Hit exceed 45 wj/l.

the dischassje sliall giot cositaisi oil or otlier sulistasices les assiousits sufficiesit to create a visible color film on the surface of tiie receivleig water s.

Saiiiples (4 Levi las coniiplianice witti tiie sinosillortsuj recluirescients specified above stiall lie takesi at a polist representative of tiie discliarge ptlor to sailxling witti otlier waste streams.

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. i page 14 of 33 . .

penult No. NN 0004006  :

1 i

pART I i

B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS

11. During the period beginning on the effective date of this pennit and lasting until June 30,1485the pennittee is authorized to discharge from outfall serial number 20200 backwater slough deicing water.

4 Such discharges shall be 1imited and nonitored by the pennittee as specifled below:

EFFLUENT CllARACTERISTIC DISCllARGE LIMITATIONS _ MONITORING REQUIREMENTS

} kg/ day (Ibs/ day) Other Units (specify) 4 Thirty (30) Thirty (30)

Consecutive Consecutive Measurement Sample i Day Average Daily Max Day Averages Daily llax Frequency .T,ype 3 Monthly Estimate Flow-m / Day (MGD) - - - -

1 The pit shall not be less than 6.5 nor greater than 8.5.

These upper and lower lirstations are not subject to averaging and shall be met at all times.

i There shall be no discharge of floating solids or visible foam except that which occurs naturally in the river in other than trace aucunts.

The discharge shall not contain oil or other substances in annunts sufficient to creat a visible color film on the surface of the receiving waters.

Sanples taken in conpliance with the ponitoring requirements specified above shall be taken at the following location: at a point representative of the discharge prior to mixing with other waste streams.

4 i Pcge 15 of 33

• Permit No: HN 0004006 1

l PART I i B. [fft.UfMT t. IMITATIONS AND HONITORING RIQUIRlHENIS

12. During the period beginning on December 1 , 1 9112 and lasting until June 3 0 , 1 9115 the Permittee is authorized to discharge f roni outf all serial siumiber 20300 screesi Isackwasti asid fish return water.

4 Such disclearges stiall be lissilted arid monitored by (lie Permittee as specified fielow:

DISCilARGE I.IMIIATIONS HONITORING REQUlHEMENTS q

IITlutNT CilARACTIRISTIC d Lg/ day (lbs/ day) Ollier Units (specify) lhlrty (30) llilrty (30)

Consecutive Consecutive Heasurement Sample llay_Averge Dall L Hja Day _Averg e Daily H.ix frequency _ _ Type flow-m/3Day (MGD) - - - - Honthly Estisiate lhere shall lie no discharge of floatisig solids or visilsle foam except t!ial wisicle occurs staturally in the river in other Lliani trace aannusits.

The discharge shall not contain oil or other substarices lei aucueils suf ficiesit to create a visible color film ori (fie surface of the receivisig waters.

Sanples taken in coupliance witti time sinisiltorisig recluireisiesits specified above sliall be taken at the following loca tiori- at a poliit representative of time discharge prior to mixing wills other waste streams.

L arge debris collected at tiie trasti racts shall lie disposed of so as to pievent it frami critering uates s of tlic State.

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PART I Page 16 of 33 Permit No: MN 0004006

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C. OTHER REOUIREMENTS

1. Pretreat:nent Recuirements No pollutant shall be discharged from this facility to a publicly owned treatment works except in accordance with pretreatment standards established in accordance with the Act or Minnesota Statutes or any such local standards or requirements. No pollutar.t shall be discharged into any publicly owned disposal systen which interferes with, passes through inadequately treated or otherwise is incompatible with such disposal system. The Permittee shall not make modificati:ns to divert any discharge of pollutants authori::e i by this permit to a publicly owned treatment works without having . rst notified and

' received the approval of the Of rector.

2. Polychlorinated Bichenyl Comeounds There shall be ao discharge of polychlorinated biphenyl comoounds i

including, but not limited to those commonly used in electrical -

transmission components.

3. Water Treatment Additives There shall be no use of water treatment additives other than those reported on the application for this permit, nor any significant increase in the amount of any treatment additive used, without prior approval of the Director. In requesting approval to use a water i

treatment additive, the Pennittee shall provide the Director (Attn:

Pemits Section) with the com.ercial name of the product to be used, the amount or concentration to be used, and the frequency of usage proposed. This permit may be modified to restrict the usage or discharge of a treatment additive or to require additional effluent monitoring.

4. Reocenino Clause This pemit shall be modified, or, alternatively, revoked and reissued, to ccmply with any applicable effluent standard or limitation issued or approved under sections 301 (b)(2)(c), and (D), 3C4 (b)(2), and 307 (a)(2) of the Clean Water Act, if the effluent standard or limitation so issued or approved:

' (1) Contains different conditions or is otherwise more stringent than any effluent limitation in the pemit; or (2) Controls any pollutant not limited in the permit.

The permit as modified or reissued under this paragraph shall also contain any other requirements of the Act then applicable.

(6/79)958262

'l PART I .

Page 17 of 33

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Permit No: MNCCC4006

5. Thermal Limitations

a. Interim limitatient The Permittae shall relocate and construct a new discharge structure cown-stream frem Barney's Point t0 reduce the :otential for cold shock. Such constructicn shall be subject to accr0 val by the Director and c:nductad in accordance with PART I, F, Schedule of C0molianca. Frem the effective date of this Peenit and lasting until the new discharge structure is c: era-ticnal, the Permittee is authcri:ed c discnarge a neated effluent frem outfall 201C0 sundect to the #cilcwing limita:icns:

1. The discharge snall not raise :Me temcerature of the receiving water at the edge of the mixing :ene acave the following limitations:

(a) at any time above a daily average of 360F, and (b) when the natural river watar tamcerature is less than 450F, a:cve 500F; and (c) when the natural river water temcerature is 450F or greatar. cre than 50F accve natural based on tne monthly average of the maximum daily temcerature.

The Permittee shalt ccmcly with whichever of the above limitations is more stringent.

ii. Mixine 2cne. The mixing :ene snall be the confluence of the discharge canal anc :ne main channel of the Mississicci River at :ne slace c:mmonly known as Barney's Point. The Permittee snall detarmine ccmcitance by :ne use of their tamcerature sensors as they exist at the time of :ne issuance of this permit.

iii. Frecuenev of Menitoring and Recorting. The Permittee snali monitor One temcerature at :ne ecge of :ne mixing :ene contincusly and recor it along with c her ment:cring da:c to the Direct:r.

b. Final Limitations During the period beginning on the data the new discharge structure te-c:mes coerational and lasting until June 30, Ig85,the Permittae is auth-orized to disenarge a heated effluent frem outfall 20100 sucject to the follewing limitations:

1. Curing the pericd Acril 1 througn Novemcer 30,the Permittee shall coerata all c: cling ::wers to the maximum orsc ical extent and shali not raise the temcerature of the receivigg water immediately below Lock and Dam No. 3 by more than 05 F (2.7 C) acave natural based on the monthly averages of :ne maximum daily temceratures, excect in no case shall it exceed a daily average tem:erature of 350: (3CCC).

- - ----.m__-__

PART I Page 18 of 33 Pemit No: MN0004006 ii. During the period December 1 through March 31, the Permittee shall not raise the mixed river temperature imediately below Lock and Dam No. 3 above 430F (6.1 0 C) for an extended period of time. Should

- the mixed river temperature imediately below Lock and Dam No. 3 equal or exceed 430F (6.10C) for two consecutive days, the Permittee shall notify the Director and the Minnesota Department of Natural Resources. Following such notification, the Director may require the Permittee to operate the cooling towers until such time the above temperature criteria can be consistently met.

iii. Abrupt temperature changes in the discharge due to changes in cooling tower operational modes or generator unit tripouts shall be minimized to the maximum extent practical to reduce the potential for cold shock in the receiving water. The Permittee shall te responsible for fish kills due to cold shock.

iv. The natural river water temperature shall be defined as the temoerature of the river water at a point unaffected by the plant or any other themal discharge.

v. The Permittee shall monitor the mixed river temperature imediately below Lock and Dam No. 3 continuously. The data shall be reoorted along with the monthly discharge monitoring reports in accordance with Part I.D.3. of this permit.

I

c. Thermal Studies Within 45 days of the effective date of this Permit,the Permittee shall submit l

to the Director and the Minnesota Department of Natural Resources for approval, a i study plan to monitor the effects of open-cycle winter operation on the aquatic i biota. The study shall include collection of background data, including mixed '

river temperature, prior to, and operational data following completion of the discharge structure construction in accordance with Part I.F.1. of this permit. The study shall be submitted to the Director and the Minnesota Department of Natural Resources no later than 1 year after each years' data collection and may be included in the Permittee's Annual Environmental Report. Each years' study shall integrate and report previous years data and results. Areas rf study shall include but are not limited to the following areas:

1. Evaluate the spawning success of walleyes and sauger as related to chill period.

ii. Conduct creel census during the winter ceriod to observe possible changes in fishing pressure and harvest.

iii. Measure walleye and sauger year class strength by use of seining data.

iv. Literature review of the possible effects of winter ocan-cycle operation on sauger and tailwater species not included on the Repres-entative Important Species list for the 316 (a) study.

Items i, ii, and 111, above should begin as soon as possible following plan approval so that background data is generated for comparison with croposed winter open-cycle operation.

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PART I .

Page 19 of 33 Permit No: MN CC040C6

6. Condenser C:oline Water Intake

a. Construction of structure

-The Permittee shall c:nstruct an alternate c:ndenser cooling water intake structure designed to minimi:e the mortality of entrained and i=oinged fish. The alternate structure snall include and emoloy the use of fine mesh screens and a Icw pressure wash, fish buckets and fish return system, and shall be constructed to eliminate the access of fish to the l recirculating cooling water canal. Scecifically, minimum design criteria l shall include a screen face veiccity of 0.5 feet :er second a: a discharge flew rate of SCO cubic feet per second using 0.5 millimeter mesh screens.

The design anc construction of ne structure snall be subject to accreval by the Direct:r, and shall be c:ncuctec in ac:Ordance with FART I.F.

Schecule of C:mpliance of ~:his Permit.

b. Oceration Follcwing comolation of the alternate condenser :: cling water intake struc-ture as required ;ursuant to this permit, the slant discharge ficws shall be limited as follcws during the scecified periocs:

April 150 cubic feet per second (cfs)

May 300 c#s June 1 - 15 400 cfs June 16 - 30 300 cfs The plant may disenar;e at higner ficw rates during the scecified :eriods if needed to prevent c:ndenser inlet temceratures from exceeding 350F Orovided that such higner ficws are minimi:ed 0: the extent ractical .

The Per:ittee may cperate with un to 3/3 inch mesh screens during tne period September 1 through Acril 15. During :ne perice Aaril 16 through August 31 the Pernittee snall use 0.5 nn mesh screens or the minimum larger si:ed screens as determined by Par I.C.5.c.i.

In addition, the intake system shall be coersted to minimi:e the mar ality of fish and c ner organisms in ac::rdance with Par !.C.5.c.

c. C:ndenser Coolina Water Intake Study I Sy June 1,1982, the Pernittee snall submi: :: :he Direc:ce for accrevai a

( plan of 5:udy to determine the effectiveness of :ne alternate concenser cooling water intake system with regard to minimizing immingement and entrainment. The final study shall be submitted to the Direc:ce alcng with the Permittee's Annual Environmental Recor:s by July 1, 1984 The study shall incluce but is not limited :: addressing the f011cwing areas:

f. Determining the fine mesh screen si:e which will minimi:e cicgging yet cotimi:e larval and juvenile fish survival.

11. Determining the survivai rate of impinged larval, juvenile and aduit fi sn.

iii. Cetermining the ctimum :ericc(s) for continuous screen re:ation ::

increase survival of imoinged fish.

PART I

. Paga 20 of 33 Permit No: MN0004C06 iv. Determining velocity profiles of the fine mesh screens at different intake / discharge flows.

v. Operation of the system to minimize the mortality of fish and other organisnm during the study period.

7. Ecological Monitoring Within 45 days of the effective date of this Permit,the Permittee shall submit to the Director for approval a monitoring plan to maintain ecolo-gical monitoring consistent with the Annual Environmental Reports.

PART I Page 21 of 33 -

Penni 3: MNCCCaCCS

0. MONITORING AND REPORTING 1 4cnit rine

a. Re:resentative Sameline 3 amoles snall :e :anen at a point re resentative of ne discharge. Any monitoring measurements taken as recuitec herein shall be representative Of the vclume anc nature of the monitored discharge.

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3. Cuality Asturance in or:er :: insure One validi:y of analytical data, :: e Permit:ae shall suomi: an Outline of :ne quality assurance

rogram employed by

ne labora:Ory performing the analyses.

Suen cuttine shall be ::ntainec in :ne monit: ring :lan recuired by PART I, 0.2.

c. Test Prececures Tes: prececures for the analysis of OcIlutants snall c:nf:rm

regulations aramulgated :ursuant :: See:icn 204 (h) of

ne Act, and Minnesota 5:stutas, Section 115.03, Sccd.1 (e) .

(7) as amenced.

E.e Permittee sna11 pariedically calibrate and perf:rm maintenance en all monit: ring and analytical instrumen stien used := monitor ;ollutants cisenarged uncer this :ermit, a:

intervals :: insure ac:uracy Of measurements. The Permittee shall maintain writ:an rec:rcs of all sucn :silbraticns anc maintenance.

d. Rec rdinc Of Results For eacn measuremen: aken or sam le 011ectad pursuant ::

ne recuirements of :nis :ermit, the Pemit:ae sna11 rec:rd the following infer =a:icn, exce : for ca:a in itens 1) and )

belcw wnich is icentified in :ne menit: ring slan recuired :y PART I, 0.2.

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1) the exac: place, cata, and time of sam: ling;

2) the dates :ne analyses aere :erf: m ed;

3) the :ersen anc :erf:rmed :ne analyses;

4) ne analytical :acnnicues, recedures or methcds used; and

5) ne results of sucn analyses.

e. Additional Menit:rine by ?ermittee If :ne ?enn10:ae ment; rs any cliutant designated nerein more frecuently than required by :his :ermit, or as ::nerwise directed by the Agency er Direct:r, ne results of suca monitoring shall be included in :ne calculation and rt orting I of values su'mitted e :n tne Disenarse Monit: ring Reccc: Form.

Any increased monitoring frecuency snail als :e indicated on sucn designated form.

Rev. 11/71/73 dA982

PART I Page 22 of 33 Permit No: fitl0004006

f. Recording and Records Retention

. All sampling and analytical records required by this permit shall be retained by the Permittee for a minimum of three (3) years. The Permittee shall also retain all original recordings from any contin-uous monitoring instrumentation, and any calibration and maintenance records, for a minimum of three (3) years. These retention periods shall be automatically extended during the course of any legal or administrative proceedings or when so requested by the Regional Administrator, the Agency, or the Director.

2. Monitorino Plan

a. The Permittee shall submit a monitoring plan to the Director for approval within forty-five (45) days after the date of issuance of this pemit in the event that a monitoring plan has never previously been submitted.

b. The Permittee shall submit a new monitoring plan or amendments to previous monitoring plans to the Director for approval within forty-five (45) days after the date of issuance of this permit

in the event that

.

1) changes in the monitoring plan are to be made,

2) additional or different monitoring is required by this permit, or

3) the latest monitoring plan submittal was rejected by the Agency.

( c. Monitoring plans shall include the items described in Agency l Regulation WPC 36 (n)(2).

3. Recorting

a. All monitoring results obtained pursuant to the orovisions of this permit shall be su:marized on a monthly basis and reported on the designated " Discharge Monitoring Report Form".

l b. Reports shall be submitted monthly and received or post-l marked no later than the'21st day of the month following the l completed reporting period. The first report is due on the reporting date following the first reporting period where monitoring is required beginning on the date of issuance of this permit. If the reporting period specified above is cuarterly, reports shall be due on tne 21st day of April, July, October, and January. Signed copies of these, and all other reports recuired I herein, shall be submitted to the Director at the following address:

Minnesota Pollution Control Agency 1935 West County Road B2 Roseville, Minnesota 55113 Attn: Enforcement Section Rev.4/10/79 #307592

PART Page 23cf 33 .,

Femi: Nc: MiCCCcCCS

.- The Pemittae shall rescr: :ne results Of -he monitoring in =e units s:ecified in tnis : emit. *he ree:r:s er written suteents snail be su:mitted even if ne discnarge :::arred curing ne rescrting :erice.

The re:cr: sna11 include (a) a descri ti:n Of any eccificati:ns in =e wastewater =11ection, trea=ent, anc dis:csal facilides; (b) any su:-

suntial enanges in ::eraticnal :rececures; (c) any ::ner signift:2n:

activities anica alter ce nature er frecuency Of Oe cisenarge; (:)

any 0:ner maurial fac* rs affecdng == liance wie One =nciti:ns Of Ois : emit anc suen infomad:n as ne Agency Or Oirec=r ay reas na:1y recuirs Of Oe Femittae :ursuan: :: *gancy Regula:icn.

'i.:C 25 (n) anc Minnescu Su:u es, Cha::a-s 115 anc 115 as a~en:ec.

d. 5xcect f:r data detamined . te =nfidendal uncer Secti:n 3C3 Of

=e Act, anc Minnescu Statutes, Secti:n 115.075, Su:c. 2, all es:ce s Ortoarse in ac= rcance vita c e te ms Of :nis :e mit saali te avaiia:ie for :u:lic ins ecti:n at :ne Offices Of me Agency. Pecacurts f:r su:mitting suca 0:nfidential catarial snall be :ursuan: .: Minnescu Regulation '4FC 35 (j) (2). As recuired :y =e c:, ef'luen: can small nc: te =nsicered =nficend al. X cwingly racing any false sutry.-

en any suca rt:crt, =nficential Or :=eraisa, is su: ject = re je: si-tion of c-iminal :enalties as :revicec f r in Secti:n 2C9 Of Oe atc anc Minnescu Sutatst, Secden 115.C71 Succ. 2 (5).

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1. 95C552

PART I Page 24 of 33

. Permit No: MN0004006 E. DEFINITIONS

1. The " Agency" means the Minnesota Pollution Cont N! Agency, as con-stitued pursuant to Minnesota Statutes, Section 116.02, Subd.1.

2. The " Directer" means the Executive Director, or other Acency staff as authorized by the Executiva Director, of the Minnesota Pollution Control Agency as described in Minresota Statutes, Section 116.03 as amended.

3. The " Regional Administ ator" means the Environmental Protection Agency t

(EPA) Regional Administrator for the region in which Minnesc:a is locatsd (now Regien V).

4 The "Act" means the Federal Water Pollution Control Act, as amended 33 U.S.C.1251, et seq.

5. A " Composite" sample, for monitoring recuirements, is defined as (1) a series of grab samples collected at least once per hour at equally spaced time intervals and 3roportioned according to flow, or (2) grab samples of equal volume collected at equally spaced intervals of efflu-ent volume and collected not less than once per hour unless otherwise .

approved in the monitoring plan.

6. " Thirty (30) Consecutive Day Average" Discharge.

a. Weicht Basis - The " thirty (30) consecutive day average" discharge is i

defined as the summation of the measured daily discharges by weight divided by the number of days during the thirty (30) consecutive day i

period when the measurements were made.

b. Concentration Basis - The " thirty (30) consecutive day average" con- -

~ centration, otner than for fecal coliform bacteria, is defined as the aritrrnetic average (weighted by flow value) of all the daily determina-tions of concentration made during the thirty (30) consecutive day period. Daily determinatier.s of concentration made using a composite sample shall be the concentration of the composite sample. When grab samples are used, the daily determination of concentration shall be the arithmetic average (weighted by flow value) of all the samples

. collected during the calendar day. .

The " thirty (30) consecutive day average" for fecal coliform bacteria is defined as the geometric mean of samples collected in a period of l thirty (30) consecutive days.

1. 1771

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- , - , . ,, - , - _ , . , , - ,- - , . - - , - , - > , . - - - ,-,e. ,.,- ,,.--, , s - , - -

PART I Page 25 of 33 Permit No: MNCCC4CCS

7. " Daily Maximum" Disenarte

a. Weient Basis - The daily maximum

• discharce means the :::al discsarce my we1;nt curing any calendar day.

b. C0ncentratien Basis - The " daily maximum" ::ne:nt-stica means :.ae cally cetermina:1cn of c:ncentration for any calendar day.

3. The "Seven (7) Consecutive Day Average" c:ncentri:icn, other than 'er fecal coliform bacteria, is defined as the arithme-ic mean of the samoles collected in a Period of seven (7) consec2:ive cays. The seven (7) consecutive day average for fecal caliform r4cteria is definec as the geometric mean of samoles collected in a :e.aicd of seven (7) c:n-secutive days.

9. Pollutants, Toxic Pollutants Other Wastas. Pein: Scur:e, Sisecsal System, Waters of the 5: ate, and c:ner erms for the :ur:ose Of : Mis permit are deffned in Section 502 of the Ac and !tinnesota 5:a:utes '

115.01 as amended and Agency Regula icn WPC 36 (b).

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- ** - ' PART I Page 25 of 33 Permit No: MN 0004006 F. Schedule of Comoliance

1. The Permittee shall cceply with PART I,C.5. and 6. in accordance with the following schedules:

in. Relocation and construction of the discharge structure:

1. Submit preliminary plans by December 1,1980

11. Submit final plans and specifications by May 15, 1981 111. Award contracts and begin construction by July 1, 1981 iv. Submit progress report by December 1,1981

v. Submit progress report by June 1, 1982 vi. Complete construction and attain operational levels by December 1,1982

b. Construction of the condenser cooling water intake structure:

1. Submit preliminary plans and specifications by December 1,1980

11. Submit final plans and specifications by May 15, 1981 iii. Award contracts and begin construction by July 1, 1981 iv. Submit progress report by December 1,1981

v. Submit progress report by June 1, 1982 vi. Place in operation by December 1,1982 vii. Submit progress recort by June 1, 1983 viii. Attain operational levels by December 1,1983

2. The Permittee shall comply with Part I,S.5. in accordance with the following scr., iule: .

Correct neutralizer tank effluent: -

1. Submit preliminary plans by February 1,1981 ii. Submit final plans and specifications by May 1, 1981 iii. Award contracts and begin construction by June 15, 1981 iv. Submit progress recort by December 1,1981

v. Complete construction and attain operational levels by June 1, 1982

3. The above comoliance schedules in Part I.F.1.a. and b. and I.F.2. maybe subject to change with the acoroval of the Director, pending the outcome of the Permittee's spent fuel pool certificate of need decision from the Minnesota Energy Agency.

4. The above compliance dates in PART I.F.1.a. and b. and I.F.2. assume i

prompt review, by the Director, of the plans and specifications.

5. No later than fourtaen (14) calendar days following the dates identified in the above schedules of compliance, the Permittee shall submit to the Director (Attn: Enforcement Section) either a report of progress or, in the case of specific actions being required by identified dates, a written notice of compliance or noncompliance. In the latter case, the notice snall include the case of noncomoliance, any remedial actions taken, and the probability of meeting the next scheduled requirements.

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PART I .

Page 27 of 33 Permit No: MN CC04006 ,

6. No Construction shall begin until the Permittee has submitted recorts, plans, and scocifications for the construction to the Direc:ce (A :n:

'E fn orcement 54c:1cn) and has received written accreval of the recorts, plans, and scocifications in accordance with PART II,

? ~,. of this ; emit.

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=-wr-w s ---g, 4 m+-,.-grg- y--. -cy----. --- --w ,v , - - e , y -. ,v7, -- -

Page28 of 33 Permit No: ItN0004006 PART II A. MANAG'EMENT REOUIREMENTS

1. Non-Comoliance and Bycass Notification If, for any reason, the Permittee exceeds any effluent limitation specified in the permit, bypasses, or causes a diversion of wastewater or unauthorized discharge in violation of this permit, the Permittee shall notify the Director as follows:

a. Telechone Cc : unication Report Immealately to the Compliance and Enforcement Section (612)296-7373 any bypass which may cause a nuisance or health hazard and all unauthorized discharges, accidental or otherwise of oil, toxic pollutants, or other hazardous waste. The Permittee shall immediately recover as rapidly and thoroughly as possible such discharged substance (s) and take such other action as may be reasonable to minimize or abate pollution of the waters of the State. This must be followed by a written explanation on the discharge monitoring report, ,

b. prior Accroval Bypassing wnich would result in the discharge of raw or inadequately treated effluent is prohibited during routine maintenance procedures.

If, for any reason, a major treatment unit must be bypassed for routine maintenance, and this bypass will result in a degradation _.

of the effluent, the Director (Attn: Operations Unit, (612)296-7207) must be notified and grant approval prior to removing this unit from service. In the case of emergency maintenance, the Director snall be informed of the circumstances surrounding the need for emergency maintenance and the action taken.

c. Written Recort Report on tne Discharge Monitoring Report, any violation of daily minimum, maximum, seven (7) day average, or thirty (30) day average effluent limitation and any bypass that did not present a nuisance or health hazard.

d. Written notification required above shall contain the following information:

i (1) A description of the discharge, approximate volume, and cause of non-compliance or bypass.

(2) The period of non-compliance or bypass including exact dates and times; or if not ccrrected, the anticipated time the non-compliance is expected to continue; and steps taken t:. correct, reduce, eliminate and prevent recurrence of the non-complying discharge.

Rev.11/21/78 #909753

- PART II ,

l Page 29 of 33 Permit No: MNCCC4CC6

2. Bycassinc

' The diversion er bypass of any discharge fr:m the collection system cr treatment facility by the Permittee is prohibited, exce::: (1) wnere unavoidable to prevent loss of life or severe pre;erty damage; or (2) where excessive s :rm drainage or runoff would damage any facilities necessary for c:meliance with ne terms and c:nditions of this ; emit.

or (3) wnere emergency maintenance must be performed; cr (4) where routine maintenance must be perfcmed en a major treatment unit and Orier accroval has been received from the Direct:r. Provisien (3) does no:

authcri:e discharges caused by a failure to per#:m reu:ine or preventive maintenance or by a failurt :: maintain system etifacility in accordance wi n PART II, A.7.

l l 3. Adverse Imcact i

The Pemittee shall take all reasonable steps to minimi:e any adverse l imcac: to waters of :ne Stata resulting from:

'a. all unauthori:td discharges accidental or c hernise. Of oil, toxic pollutants er other ha:ardcus subs.ances;

b. effluent limitation viola:1cns cr; .

C. a bypass.

l 4 Chance in 01scharee

a. All disenarges authori:ed herein shall be ::nsistant wita :ne terms and conditiens of this ;ermit. The discharge Of any :ollutant mere frequently than, er a a level in excess of, tha: identified and authori:ed by this ;emi: shall c:nstitute a violation Of :ne terms anc c:nditions of this permit. Such a viciatien may result in :ne imcosition of civil or criminal penalties as provided f:r in Secti:n 309 of the Act and Minnesc:a Statutes Secticn 115.071.

I b. Facility mccifica:icns, additions, and/or ex:ansiens :na: increase l

the plan capacity shall be recorted to the Direct:r, (A :n: Comaliance and Enforcement Section) and this permi: then ecdified cr reissued ::

l reflect such changes.

c. Any antici;ated cnange in :ne facility disenarge, including any new significant industrial discharge or significan: :nange in :ne cuality cf existing industrial disenarges t :ne treatment system that may result in a new Or increased discnarge of :cIlu:an:s snall be rescried to the Direc ::r, (At:n: Compliance and Inforcemen:

Section). Mcdification :: :ne pemit may then be made :: reflect any necessary change in ; emit c:nditiens, including any necessary effluent limitations for any ;cilutant not identified and limited herein.

Rev.ll/21/73 #138649

PART II

.- Page 30 of 33 Permit No: 11N0004006

d. In no case are any new connections, increased flows, or significant changes in influent quality permitted that will cause violation of the effluent limitations specified herein.

5. Facilities Ooeration and Quality Control All waste collection, control, treatment, and disposal facilities shall be operated in a manner consistent with the following:

a. Maintenance of the treatment facility that results in degradation of ef#1uent quality shall be schedulec as much as possible during non-critical water quality periods and shall be carried out ta a manner approved by the Director,

b. The Director may require the Permittee to submit a maintenance plan to eliminate degradation of the effluent. The Permittee shall operate the disposal system in accordance with this plan as approved by the Director.

c. The Permittee shall provide an adequate ocerating staff which is duly qualified under Minnesota Regulations WWOB 1, if applicable (as determined by the Director pursuant to Agency Regulation WPC 36 (1) (6) (ee), to carry out the operation, maintenance and testing functions required to insure compliance with the conditions t of this pennit.

d. The Permittee shall at all times maintain in good working order l and operate as efficiently as possible all facilities or systems of cor. trol installed or used to achieve compliance with the terms and conditions of this permit.

e. Necessary in-plant control tests shall be conducted at a frequency adequate to ensure continuous efficient operation of the treatment facility.

6. Removed Substances The Permittee shall dispose of solids, sludges, filter backwash, or other pollutants removed from or resulting from treatment or control of wastewaters in such manner as to prevent any pollutant from such materials from entering waters of the State. The Permittee in disposal of such materials shall comply with all applicabla water, air, and solid waste Statutes and Regulations. When requested, the Permittee shall submit a plan for such disposal for approval by the Director.

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Rev.ll/21/78 #139561 ,

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a PART I

- Page 31 of 33 -

Pe rmi t .'10 : MN CCcCC6 ..,

7. System Reliacility

.The Permittee is rescensible for maintaining adecuate safeguards to prevent tne disenarse of untreatad or inadecuataly treated wastas at all times. The Permittae is res:cnsible for insuring systam reliability by means of alternata =cwer scurces, back-uo systems, storage of inadecuataly treatad effluent, or other accrecriate methocs of naintaining system reliability.

3. Construe:1cn This :c md: autnori:ss the c ns .uctic.1 of treatment works :c attair. ::molianca with the limitations and canditions of :nis Permit, only after plans and s:ecifications for treatment facilities have been su:mittad to and accreved in writing by the Direct:r arice to the start of any c:nstruction.

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, , PART II Page32 of 33

. Permit No: MN0004006 .

B. RESPONSIBILITIES

^

1. Tranfer of Ownershio or Control No permit may be assigned or transferred by the holder without the approval of the Agency. In the event of any :hanges in control or ownership of the facilities, a Request for Permit Transfer, signed by both parties shall be sent to the Agency. (Attn: Compliance and Enforcement Section). Any succeeding owner or controller shall also comply with the terms and conditions of this permit.

2. Permit Mndifica-ion After notice and opportunity for a hearing, this permit may be modified, suspended, or revoked in whole or in part during its term for cause in-cluding, but not limited to, the following:

a. violation of any terms or conditions of this permit;

b. obtaining this permit by misrepresentation or failure to dis-close fully all relevant facts;

c. a change in any condition that requires either a temporary or .

permanent reduction or elimination of the authorized discharge; or

d. Agency Regulation WPC 36 (s) (1).

3. Toxic Pollutants Notwithstanding PART II,8.2. above, if a toxic effluent standard or prohibition (including any schedule of compliance specified in such effluent standard or prohibition) is established under Section 307 (a) of the Act or Minnesota Statutes Chapters 115 and 116 as amended, for a toxic pollutant which is present in the discharge and such standard or prohibition is more stringent than any limitations for I such pollutant in this permit, this permit shall be revised or modified in accordance with the toxic effluent standard or prohibition and in accordance with applicable laws and regulation.

4. Richt of Entry The Permittee shall, pursuant to Section 308 of the Act and Minnesota Statutes 115.04, allow the Director of the Agency, the Regional Administrator, and their authorized represente tives upon presentation of credentials:

a. to enter upon the Permittee's premises where a disposal system or other point source or portion thereof is located for the pur-pose of obtaining infomation, examination of records, conducting surveys or investigations;

. b. to bring such equipment upon the Permittee's premises as is necessary to conduct such surveys and investigations;

1. 5319

• • 4 c. ,

PART II .

Page 330f 33 ,

Permit No: MNCC04006

c. *

3 examine and cecy any backs, ;acers, records, cr memoranda pertaining to the installation, . maintenance, er Oceratien of :ne discharge, including but not limitad to, monit: ring data of :ne disposal system or point source er rec:rcs requitec :: be kept under the terms and conditions of this permit;

d. to inscect any monit ring equipment er menit ring procacures re-cuired in :nis permit; and

e. to sample any disenarge of ;cilutants.

5. Civil and Criminal Liability Nothing in this ;ernit shall be ::nstrued to relieve ne Fermittee frem civil or criminal cenalties for non-c mellance with :ne terms and conditions provided herein.

5. 011 and Ha:nedcus Substance Liability Nothing in this permit shall be c nstrued :c precluca :ne institutien of any legal acti:n er relieve the Pennittae ft:m any res:ensibilities, -

liabilities, or penalties to wnich :Me :eenittee is er may be su jet:

to under Sec: ton 311 cf :ne Ac: and Minnesota Sta:utes, Chac:ars 115 and 116 as amended.

7. Minnesota Laws Notning in tnis :erti: snall be construed :: Dreclude Me institution :f any legal or administrative proceedings er relieve ne Pernittee from ,

any res:ensibilities, liabilities, or penalties for violation of effluent and dater cuality limitations not included in :nis :ermit.

S. Procerty tients The issuance of this permit dces not convey any Oracerty rign:s in eitner real or ;ersonal procerty, or any exclusive :rivileges, ner cces it authori:e any injury :c private crecer:y or any invasien of

ersonal rights, nor any infringement of Federal State, or Local laws er regulations.

g. Severability -

The previsions of tnis :ermit are severacle, and if any provisions Of

Mis ;ermit, ce the acclication of any revision of nis permi: ::

any :ircumstance, is held invalic, :ne acclication of such revision to other cir: mstances, anc :ne remainder of :nis :ermit shall ne:

be affected thereby.

1 (025392

Exhibit A IvlinnOSota Pollution Control Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED JAN 191981 Mr. Gary V. Welk, Manager Regulatory Compliance and Services Northern States Power Company 414 Nicollet Mall Minneapolis, Minnesota 5540T Re: Final NPDES Permit #MN 0004006 Northern States Power Company Prairie Island Nuclear Generating Plant

Dear Mr. Welk:

Enclosed is a copy of the final National Pollutant Discharge Elimination System (NPDES) Permit covering your fac111 ties at the above referenced location. This Permit has been drafted pursuant to the Federal Water

! Pollution Control Act, as amended (33 U.S.C.1251 st seq), Minnesota Statutes, Chapters 115 and 116 as amended and Minnesota Pollution Control l

Agency Regulation WPC 36. All corrnents submitted in writing during the public notice comment period, pursuant to WPC 36, Section (h)(a) and the hearing record, where a hearing was held pursuant to WPC 36, Section (k) have been considered in the formulation of final determinations and recom-mendations on the NPDES Permit. Enclosed also please find Discharge Monitoring Report Forms for your use.

If you have any questions regarding this Pemit, please contact Mark l Lahtinen at 296-7750.

Sincerely, g 7 "

s --u-^

R6ndy D Burnyeat Acting Chief, Permits Section Division of Water Quality RDB/MJL:jae Enclosure (s) cc: Permits-U.S. Environmental Protection Agency, Chicago (2)

P5cre:

1935 West County Reaa 32 Resev sle. Minnescta 55113 Regicnal C".ces Du:utn Brainerc Ce:re:t La<es Marsna:t Accres:er E:a cc: ort.no Encyer 04

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