ML12157A413

Attachment 34 to GNRO-2012/00039 - Er Reference - MDEQ 2011a (NPDES Permit Rationale) Rationale for Reissuance

ML12157A413
Person / Time
Site:	Grand Gulf
Issue date:	05/23/2012
From:	Entergy Operations
To:	Office of Nuclear Reactor Regulation
References
GNRO-2012/00039
Download: ML12157A413 (32)

Text

Attachment 34 to GNRO-2012/00039 Attachment 34 to GNRO-2012/00039 ER Reference - MDEQ 2011a (NPDES Permit Rationale) Rationale for Reissuance

PERMIT RATIONALE FOR REISSUANCE Entergy Mississippi Ine, Grand Gulf Nuclear Station Claiborne County Port Gibson, Mississippi Water NPDES No. MS0029521 April 27, 2011 FACILITY INFORMATION Facility Name: Entergy Mississippi Inc, Grand Gulf Nuclear Station Facility Address: 7003 Bald Hill Road Port Gibson, MS 39150 Permit No.: MS0029521 SIC: 4911 Permit Writer: Thomas Kelly EPD Branch: Energy and Transportation Branch

[I. NATURE OF BUSINESS Nuclear Powered Steam Electric Plant. The facility operations fall within SIC Code 4911 -Steam Electric Power Generation. This facility is classified as a NPDES major source.

Ill. EFFLUENT AND RECEIVING STREAM FLOW DATA Ektemal Outfalls 001 - Discharged from the Mixing/Discharge Basin. Effluent from this outfall is combination of internal outfalls(s) 002,004,005,006 and 011. This outfall has a maximum 30 day flow of 12.05MGD and discharges to the Mississippi River.

The Mississippi River is classified as "Fish and Wildlife". The 7QI0 flow is 82,082 MGD.

013 - Discharged from Sediment Basin A - Effluent from this outfall consists ofthe combined discharge from the Bechtel Shop; Vehicle Maintenance Shop; Ice House Condensate; Standby Service Water Leakage; Construction and Site Runoff; Once Through Cooling; Site Processing Facility HVAC; Internal Outfall 010 (Sanitary); Internal Outfall 016 (Energy Service System). This outfall has a maximum 30 day flow of 0.8 MGD.

2082 PER20070001 I

Outfalls 013 discharge to an unnamed creek thence to Hamilton Lake. The receiving stream is c, ssified as "Fish and Wildlife" and has a 7Q10 flow of 0 MOD.

014- Discharge from Sedimentation Basin B - This discharge is a combination of discharges thlnm Outfall 007; Standby Service Water Leakage and Releases; Intermittent Circulation Water Basin C4verflows; and Storm water Runoff. This outfall has a maximum 30 day flow of 0.07 MOD.

Outfall 014 discharges to an unnamed creek thence to Hamilton Lake. The receiving stream is classified as "Fish and Wildlife" and has a 7Q10 flow of 0 MOD.

Internal Outfalls 002 - (Categorical: Cooling Tower Blowdown) - Natural draft and auxiliary cooling Tower Btowdown.

This outfall has a maximum 30 day flow of 11.64 MGD and discharges via Outfall 00.

004- (Categorical: Cooling Tower Blowdown) - Unit One standby service water (SSW- A). this outfall has a maximum 30 day flow of 4.16 MOD and discharges via Outfall 001.

005 - (Categorical: Cooling Tower Blowdown) - Unit Two standby service water (SSW-B). 74his outfall has a maximum 30 day flow of 5.97 MOD and discharges via Outfall 001.

006 - (Categorical: Low Volume) - Low volume waste basin including demineralizer wastewa~er, carbon filter backwash, and water treatment building sump. This outfall has a maximum 30 day flow of 0.65 MOD and discharges via Outfall 00 1.

007 - (Categorical: Low Volume)- Miscellaneous Wastewaters discharged into Sedimentati n Basin B comprised of Administrative Building Drains; Yard and Storm Drains; Fire Water Pump House; Oily Waste Sumps; Ionics Reject Water; Turbine Building Cooling Water BlowdovJn; HVAC Blowdown; Air Conditioner Once Through Cooling; Outage Air Compressor Onc4 Through Cooling; Intermittent Standby Service Water and Plant Service Water leakage and sma I releases.

This outfall has a maximum 30 day flow of 0.299 MOD and discharges via Outfall 014.

010- Outfall 010 (Non-categorical) - Sanitary Wastewater. This outfall has an average flo, of 0.012 MOD and discharges via Outfall 013.

2082 PER20070001 2

01 - (Non-categorical) - Treated Liquid Rad Waste Water. This outfall has a maximnum30 day flow of 0.049 MGD and discharges via Outfall 001.

016- (Non-categorical) - Miscellaneous Wastewaters from the: Energy Services Center Inclusive of Water Softener Backwash, Air Conditioning.Cooling Tower Blowdown and Storm Water Runoff.

This outfall has a maximum 30 day flow of 0.0698 MGD and discharges via Outfal. 013.

IV.. 363(d) ISSUES T~is~is an existing discharger with no modifications occurring to the facility's operations therefore, there are no 363(d) concems, V. 1TPE OF WASTEWATER TREATMENT:

00 ! - Commingling of waste streams from Outfalls 002, 004, 005, 006, 0 11,and the cooling tower makeup bypass.

002- No treatment.,

004 - No treatment.

0O5- No treatment.

006 - No treatment.

007 - Oil/Water separation provided for selected internal waste streams.

016- Sanitary Wastewater Treatment Plant with treatment including activated sludge, aeration, chlorination and dechlorination.

0 11 No treatment.

063.-. Oil/Water.separation provided forselectedintemal waste streams. Settling:provided forcommingled wastewaters.

0o4 - Oil/Water separation provided for selected internal waste:streams. Settling provided forcommingled wasteWaters.

0116 . No treatment.

VI. STATE APPLICABLE GUIDELINES

[Wastewater Regulations for National Pollutant Discharge Elimination System (NPDES, Permits.

Underpground Iniection Control (UIC) Permits., State Permits, Water OualitY Based Effluent Limitations. and Water Ouality Certification. hereafter referred to as WPC-J.

2082 PER2007000O 3

2. State of Mississippi Water nualitv Criteria for Intrastate. Interstate, and Coastal Water d1 by k nnFnirnmunt1 nn Cnmiun )Il~iv l~the 9 9ffl~ ~re rfprrpdtn Mf by MiSSiSSi Di CO i ion on Environ ental, ualitv: October 24 20021 he after fe-dito as WPC-2.

VII. EPA APPLICABLE GUIDELINES 40 CFR Part 423 - Steam Electric Power Generation Point Source Category; Sections 423.12 3EPT-Best Practicable Control Technology Currently Available) and 423.13 (BAT-Best Available T chnology Economically Available). See Attachment A.

VIII. DATA FROM APPLICATION FORM (2C, 2E):

External Outfalls:

Maximum Daily Value Parameter Outfall 001 Outfall 013 Outfall 014 i BODs 1.2 mg/I 1.2 mg/I 1.0 mg/I _!

COD 89 mg/I 32 mg/I < 20.0 mg/It TOC 8.3 mg/I 5.9 mg/i 4.4 mg/I TSS 5 mg/I 24 mg/I 3.0 mg/I Ammonia (as N) 0.1 mg/I <0.1mg/I 0.12 mg/l I Flow 24.24 MGD 0.8 MGD 0.07 MGD Temperature (Winter) 30.7 OC 14.5 °C 17.3 OC Temperature (Summer) 44.9 °C 27.1 °C 28.6 °C pH 8.31 S.U. 7.98 S.U. 8.64 S.U.

Bromide 0.74 mg/I 1.06 mg/I 0.25 mg/I Chlorine, Total Residual -- -- --

Fecal Coliform 180 col./I 00 ml 110 col./l00 ml 110 coL/100 n__

Fluoride 0.57 mg/I 0.17 mg/I Nitrate-Nitrite 0. 10 mg/I -- --

Nitrogen, Total Organic (as N) 0.86 mg/I 0.48 mg/I __--

Phosphorus 0.97 mg/I 0.18 mg/I 0.28 mg/I _

Sulfate (as SO 4) 310 mg/I -- 18.3 mg/l _ _

Barium, Total 0.25 mg/I 0. 12 mg/I 0.07 mg/I Boron, Total 0.15 mg/I -- -

Iron, Total' 2.39 mg/L 0.27 mg/I 0.10 Mg/I _

Magnesium, Total 43.9 mg/I 24.0 mg/I 15.7 mg/I _

2082 PER20070001 4

Maximum Daily Valu&

Parameter Outfall 00 L., Outfall1 013. Outfall 014 Manganese, Total .0.37 mg/I 0.28mg/I --

Antimony, Total <0.0005 mg/l < 0.005 mg/i < 0.005mg/I Arsenic, Total' 0.008 mg/I 0.012 mg/I 0.015 mg/I Beryllium, Total <0.001 mg/I <0.001 mg/I < 0.001 mg/I Cadmium, Total < 0.005 mg/l <0.005 mg/I < 0.005 mg/I Chromium, Total < 0.002 mg/I < 0.002 mg/I < 0.002 mg/I.

Copper. Total < 0.010 Mgt] < 0.010mg/I* 0.010 mg/i Lead,.Total < 0.001 mg/i < 0.001 mg/I 0,00 1 mg/I Mercury, Total' 6.3e-6:mg/I 2.0e-6 mg/I 2.3e-6 mg/I Nickel, Total < 0.02 mg/I < 0.02 mg!I < 0.02 mg/I Selenium, Total <0.005 mg/I <0.005 mg/I <0.005 mg/I Silver, Total <0.0003 mg/I <0.0003.mg/! <0.0003 mg/I Thallium, Total <0.001 mg/I <0,001 mg/It <0.001 mg/l Zinc, Total' 0.356 mg/l <0.01 mg/I <0.01 mg/I Bis (2-Ethyl-hexyl) Phthalate! 0.017 mg/I .. _

Internal Outfalls:.

Maximum Daily Value _

Parameter Outfall 002 Outfall 004 Outfall 005 Outfall 006 qOD5 < 1.0 mg/l <1.0mg/I 1.2 mg/I 15 mg/i COD .30 mg/I 55 mg/I 36 mg/l: < 20,0 mg/I 1kOC 10mg/I 11.7mg/l 12.2 mg/i 4.6 mg/I iss < 1.00 mg/i 5 mg/l: 4 mg/I 16 mg/I 4mmonia (as N): < 0.310 mg/l 0.17 mg/I 0.23 mg/l < 0.10 mg/I Plow 13.06 MGD 6.66 MGD 5.97 MGD 0.65 MGD 17.4 C0 16.1 *C 18.8 °C 18.9 *C Temperature (Winter)

Temperature (Summer) 28.1°C 26.2 *C. 22.6 °C 29.2 'C 8.35 S.U. 7.51 S.U. 6.96 S.U. .8,51 SU;

..romide 0.76 mg/I 14.4 mg/I 12.1 mg/l 0.52 mg/I qhlorine, Total Residual .0.17 mg/I.

6ecal Coliform. 180 coui00 nil ml Flluoride 0.66 mg/I 032 mg/t 0.33 mg/I 0.35 mg/l Nitrate-Nitrite 1.10 mg/I 0.28 mg/i 0.63 mg/I Nitrogen, Total Organic 0.75 mg/I. 1.27 mg/I 1.05 mg/I 0.40 mg/l.

I'losphorus .1.09 mg/i .2.86 mg/! 3.48 mg/l 3.38 mg/l Sulfate 388 mg/l 202 mg/I 257 mg/I 3370 mg/Il Aluminum, Total. - 5.46 mg,/

2082 PER2007000I 5 5

Maximum Daily Value.

Parameter Outfall 002 Outfall 004 Outfall O05 Outfall 006 Barium, Total 0.32 mg/I 0.09 mg/I 0.09 mg/I 0.04 mg/I -

Boron, Total 0.23 mg/I 0.12 mg/I 0.11 mg/! .

Cobalt, Total -.. 0.01 mg/i.

Iron, Total 12.61 mg/I 2.47 mg/i. 3.16 mrg. 48.6 mg/1 Magnesium, Total 53.5 mg*/ 24.7 mg/i 25.9 mg/ 54.3 mg/I Manganese, Total 0.34 mg/I 0.08 mg/l 0.22 mg/[ 1.47 mo/il Arsenic, Total 0.008 mg/I 0.006 mg/I 0.012 m&I Cadmium, Total - 0.0008 m VI Chromium, Total - - 0.125 M I Copper, Total - 0.039 mg/I 0.1: 13 mg/l .0.098 m I Lead, Total 0.003 mg I Mercury,-Total 3.9e-6 mg/ 1.23e-5 mg/I 2.98e-5 mg/I 5.5e-6 m ..

Nickel, Total 0.008 mg/I *0.16 0.13 mg!I 0.136m&i Selenium, Total -0.007 m Zinc, Total 0.78 mg/I 0.59 mg/I 0.62 mg/I 0.270 m 4-Nitrophenol - 0.283 mg/I - _

Benzidine 1.51 mg/I ..

4-Bromophenyl Phenyl Ether - 0.006 mg/Il Maximum Daily Value Parameter Outfall 007 Outfall 011 Outfall 01 6 Outfall 0 10 BOD 5 3.0 mg/I < 2.0 mg/L < 1.0 mg/L 11.70 mog!:.

COD < 20.0 mg/l < 4.32 mg/L 80 mg/L < 20 mg/i TOC 4.30 mg/l < 0.33 mg/I 10.1 mg/I 3.30 mg/I1 TSS 47.mg/I 1.55 mg/L I1 mg/L 23.

Ammonia (as N) <0.1 mg/I 0.042mg/L <0.1 mg/L <0.1 mgotL Flow 0.5472 MGD 0.0762 MGD 0.0698 MGD 0.06 M bG Temperature (Winter) 20.6 0C 31.2 0C 15.8 OC 22.20 OCT Temperature (Summer) 28.1 1C 0C 31.0 29.6 0C. 28.90 *C _

pH, 8.79 s.u. 7.75 s.u. 8.80 s.u:. 8.32.s.u.i Fecal Coliform -_ 1.2000 coldI1.00 ml 20 col.1001Wm Bromide 5.29mg/ -

Chloride, Total Residual -- 0.21 mg/l 0.16 mg/I Fluoride 0.30 mg/I - 0.30 mg/L -

2082 PER20070001 6

Maximum Daily Value Parameter Outfall 007 OutfallOI 1 Outfall 016 Oulfall 010 Nýitrate-Nitrite 0.85 mg/i - 0.99 mg/L -

Nitrogen, Total Organic (as 0.22 mg/I 0.042 mg/I 0.52 mg/L -

N)

Chlorine, Total Residual 1.43 mg/i 0 mg/I - -

Oil and Grease <637 mg/I - < 2.4 mg/I Phosphorus 0.24 mg/[ 0.74 mg/L 0.17 mg/I _

Alpha, Total: 4.63 pCi/I - _-

Beta,. Total ,- 725 pCi/I -

Radium, Total - 2.55 pCi/I -

Radium 228, Total -- 1.05 pCi/A --

Sulfate (as SO 4) 35.6 mg/I - 27.6 mg/I _

Barium, Total: 0.08 mg/I - 0.42 mg/I _.

Boron, Total 0.04 mg/I - 0.03 mg/I Cobalt, Total - 0.111 mg/i. -

kon, Total 0.23 mg/I 39.5 mg/L 0.08 mg/L _

Magnesium, Total 32.2 mg/l - 146 mg/I -

Molybdenum, Total, , 0. 149 mg/i -

Manganese, Total .. 0.'06 mg/I Arsenic, Total - 0.027 mg/L -

Chromium, Total 0.004 mg/I - 0.006 mg/L _

Copper, Total 0.01 2 mg/I 0.599 mg/L -

Mercury, Total 8.7e-6 mg/I - 2.3e-6 mg/L _

Thallium, Total - 0.336 mg/I -

Zinc, Total 0.042 mg/I I _- .0.013mg/I _

The parameters listed above were reported at a concentration greater than the appropriate minimum quantification level (MQL) listed in Exhibit D of the WPC-I regulations. All other parameters listed on the Form2C application are not shown due to one of the following reasons: (I) testing was not required, (2) the parameters were believed absent, (3) the reported concentrations were non-detect or less than the appropriate MIL for each parameter tested.

'These parameters have been included in the External Outfaill 001 toxicity screening procedure provided in Attachment B.

ViII. WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION None

,2082 PER20070001 7,

IX. CATEGORICAL LIMITATION CALCULATIONS Not Applicable X. TOXICITY SCREENING See Attachment B X1. PROPOSED FINAL LIMITATIONS

1. Outfall 001 - External Average Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis 001 Flow (MGD- Report Report Eng. Jidgment 001 Temperature IF -- -- Report Report Eng. J dgent 001 Chlorine, Free 0.2 mg/I 0,2 mg/I 0.2 mg/I Categ~rical Available 001 pH - 6.0 s.u. 6.5 s.u. 6.0 s.u. WPC-_ _

Maximum Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis 001 Flow (MGD) -RReport eport Eng. JAdgment 001 Temperature *F Report Report Eng. J~dgment Chlorine, Free 001 Available 0.5 mg/I 0.5 mg/I Categorical 001 pH - 9.0 s.u. 9.0 s.u. 9.0 s.u. WpC-2

2. Outfall 002 - Internal Average Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis.

002 Flow (MGD) -- -- Report Report Eng. .,udgment 002 AiablChlorine Free 0.2 mI 0.2 mg/I 0.2 mg/I Categ9P_____________

rical

____Available 002 Chlorination Duration .

-- Report Report Eng. Judgment 002 Zinc, Total Recoverable 1.0 mg/I -- 1.0 mg/I1.0 mj l Categbrical 2082 PER20070001 8

Maximum. Permit Limitations:

Water Proposed Categorical Quality. Present Permit Permit Outfall Parameter Limitation Limitation- Limitation: Limitation Basis 002 Flow (MGD). - ... _- Report Report Eng. Judgment.

002 Chlorine, Free. 0.5 Mgt[ 0.5 mg/i 0.5 mg/I Categorical Available 0_-_5_5_a r 002 Chlorination.Duration 120 min - 120 min 120 min Categorical 002: Zinc, Total Recoverable 1.0 mg/I 1.0 mg/I 1.0 mg/l Categorical.

3I OUtfall:004 - Internal Average Permit Limitations::

Water Proposed, Categorical Quality Present Permit Permit Outfall lOarameter Limitation Limitation Limitation. Limitation Basis 004 Flow (MGD). - - Report Report Eng. Judgment 004 Chlorine, Free 0.2 mg/I - 0.2mg/i. 0.2 mg/l Categorical Available. * " .__"

004 Chlorination Duration .... Report Report Eng. Judgment 004 Zinc, Total Recoverable 1.0 mg/I - 1.0 mg/I 1.0 ral! Categorical Maximum Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation; Basis 004 , low (MGD) . -- ReportReport Eng. Judgment C~hlorine,.Free 004 Chloinebre 0.5 mg/I - 0.5 mgIl 0.5 mg/I Categorical

____Available_______________________

004 Chlorination Duration 120 min - 120 min 120 min Categorical 004 Zinc, Total Recoverable 1.0 mg/I 1.0 mg/I I,0 rg!! Categorical

4. Outfal1 005 - Internal.

Aerage Permit Limitations:

Water Proposed Outfall Parameter Categorical Limittion Qualitye Present Permit Permit Basisitaio Basis Limitation QLitato Limitation Limitation_,

005 Flow (MGD) -- Report R Eng. Judgment

... .Chlorine, .Free. ".....

005 Avaiae F 0.2 mg/I 0.2 mg/l 0.2 mg/I Categorical 005: Chlorination Duration . ... Report Report Eng.: Judgment 005 Zinc, Total Recoverable] 1.0 mg/I 1.0 mg/I " . l Categorical 2082 PER20070001'. 9.

Maximum Permit Limitations:

Water Proposed*

Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis _

005 Flow (MGD) .

-- Report Report Eng. Jddgment 005 Chlorine, Free 0.5 mg/I -- 0.5 mg/I 0.5 Mg/! Categorical Available 005 Chlorination Duration 120 min -- 120 min 120 min Categ ical 005 Zinc, Total Recoverable 1.0 mg/I - 1.0 mg1.0 mg/I Catego rical

5. Outfall 006 - Internal Average Permit Limitations:

Categorical Water Present Permit Proposed Outfall Parameter Limitation Quality Limitation PermitaBao Limitation Limitation 006 Flow (MGD) - - Report Report Eng. J dgment 006 Oil and grease 15 mg/I 15-Img/mg5 I CategRlrical Solids (Total 006 Suspended) 30 mg/I 30 mg/I 30 mg/I Categgrical Maximum Permit Limitations:

Water Present Permit Prropo sed Categorical Outfall Parameter Limitation Permit Basis n Limitation Limitation 006 Flow (MGD) -- - Report Report Eng. Jqdgment 006 Oil and grease 20 mg/I 20 mg0 mg/I Categ rical 006 Solids (Total 100 mg/I 100 mg/I 100 mag/I Categ rival

____Suspended) ______ ____________________________

T

6. Outfall 007 - Internal Average Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation BasisI 007 Flow (MGD) .

-- Report Report Eng. J14dgment 007 Oil and grease 15 mg/I 15 mg/I !5 mg/I Categcrical Solids (Total 007 Suspended) 30 mg/I 30 mg/I 30 mg/I Categdrical 007 Residua Total - Report Report Eng. Jhdgment Residual 6 1007 pH 6.0 s.u. 6.5 s.u. 6.0 s.u. WPC-4 2082 PER20070001 10

Maximum Permit Limitations:

OutfallIParameterCategorical!

i Oufal:

PramterLimitation Water Present Permit Limitation. Proposed Quality Limitation; Permit Limitation Basis 007 Flow (MGD) - - Report Report Eng. Jud4Gment 007 Oil and grease 20 mg/! 0m m Categorical 007 Solids (Total 100 mg/I - 100 mg/I IO0 mg/I Categorical

____Suspended)____________________________ _________

Chlorine, Total:

007 Residual - Report Repor Eng. Judgment 007 pH 9s9.0 S.u. .0 su. 9.0 s.u. WPC-2

7. Outfall 010- Internal Average Permit Limitations:

Categorica Proposed Water Quality Preesent Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis 010 Mlow (MGD) - - Report Report, Eng. Judgment old IOD Dy). 30 mg/ 30 mg/i Domestic 0(D)m 3Guidelines 010 Solids (Total Suspended) - - 30 mg/I 30 mg/I Domstic

.. _ _,_Guidelines

'010 ihlorine, Total Residual - - Report Report Eng. Judgment 010. lecal Coliform, 200 col,/100 ml - 200 col.1!00 mi WPC-2 (summer) 010 Fiecal Coliform, (winter) -2000

______ _ l col./100 2000 ml col 100 2000 co!JI00 ml WPC-2 010 pH - 6.0 s.u. 6.5 s.u. 6.0.s.u. WPC-2.

SMaximum Permit Limitations:

Categorica Proposed I Water Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis..

010 1llow (MGD) Report Report Eng. Judgment

• 010 BOD (5-Day). - 45 mg/I 45 mg/I GuDestic

.... Guidelines

- 45Domestic.

Solids (Total Suspended) 45 mg/l. 45 Mg/ Guidelines 010 010 qhlorine, Total Residual - - 0.5 mg/i 0.5 mg/I Eng. Judgment 010 Fecal Coliform, 400 col./100 ml - 400 col.!100 ml WPC-2 (summer)_ _

010 Fecal Coliform, (winter) -. 4000 col./100 4000 coIl100 4000 col./100 ml WPC-2 010 130___

p~-l --

9.0_______ml 9.0s.u.

ml 9.0s.u..

9.0s 9.0s.u.

WPC-2 .

2082 PER2007000 1: 11

S. Outfall 0 11 - Internal Average Peanit Limitations:

Ouitfall Parameter Categorical: Water Quality Present Permit Prmitsedsi Outfa PrameerLimitation Limitation Limitation Permit Basis

• __*__*_ _Limitation _

0oi Flow (MGD).

Solids (Total

- - Report Report Eng.] dgxnent 01 Soidspend

( - Report Report Eng. Jldgment Suspended)..

Maximum Permit Limitations:

Water Present Permit Proposed Outfall Parameter iiiLimitation Quality Limitation Limitation Permit Basis O.ill "Flow (MGD)" Report Report. Eng. Jdgient oil .Solids (Total 30 mg/i 30 mg/l Eng. Jidgment Suspended)

9. Outfall 0,13 - External Average Permit Limitations:.

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter: Limitation Limitation Limitation Limitation. Basis 013 Flow (MGD) " - Report Report Eng. Jidgment Solids (Total 013

. . . . Suspended)

S u s en e d - - Report . Report.. .*:............... . ... Eng.. J.; idgment 013 p111 - 6.0 s.u. 6.5 s.u. 6.0 s.u. WPC-2

.0.13 Zinc, Total Recoverable -_ " 0.065 mg/I - Report K, Eng. Jhdgment Maximum Permit Limitations*

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis!

013. Flow (MGD) - - Report Report Eng. Yudgment Solids (Total 013 Suspended) - - Report Report Eng. Judgment 013 pH . - 9.0 s.u. 9.0 s.U. 9.0 s.u. WPC-2 013 Zinc, Total Recoverable -j 0.065 mg/I - 0.065 mg/i: WPC2

10. Outfall 014 Average Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation. Limitation..... Limitation Basis:

014 Flow (MGD) - - Report Report Eng. Judgment 014 Solids (total Report Report Eng. Judgment.

014 Zinc, Total Recoverable - ... . . Report Eng. Judgment 014 pH - 6.0 s.u. 6.5 s.u. 6.0 s.u. WPC-2 2082 PER2007000t1 12

Maximum Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basisl 014. Flow (MGD) - Report Report Eng. Judgment 014 Solids (Total 0uspended). - - Report Report Eng. Judgment 014 Zinc, Total Recoverable - 0.065. mgtl -- 0.065 mg/l WPC-2 014 pH - 9.0 s.u. 9,0 s.u. 9.0 s.u. WPC-2

11. Outfall 016 Average Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfall Parameter Limitation Limitation Limitation Limitation Basis 016 Flow (MGD) - Report Report Eng. Judgment 0.16 Chlorine, Total Residual -- - Report Report Eng. Judgment 016 pH - 6.0 S-u. 6.5 s.u. 6.0 s.u. WPC-2 Maximum Permit Limitations:

Water Proposed Categorical Quality Present Permit Permit Outfa1l Parameter Limitation Limitation Limitation Limitation Basis 016 Flow (MGD). - Report Report Eng. Judgment Total Chlorine, 016 Residual -- 0.5 mg/I 0.5 mg/I Eng. Judgment:

016 pH 9.0 s.u. 9.. 9.0 s 9.0 s.U. WPC-2 Total Recoverable Iron Total Recoverable Iron shall be monitored at Outfall 013 on a monthly basis, utilizing 24-hour composite sampling,,

until 12 monthly samples have been: collected., Sampling should begin following the effective re-issuance date of this permit and shall be representative of all 4 seasons upon completion. Total Recoverable Iron shall be analyzed using EPA method 200.8 or an approved equivalent method with a MQL of 10 micrograms/L.

Total Recoverable Arsenic Total recoverable Arsenic shall be monitored atOutfall 014 on a monthly basis, utiiizing.24-hour composite sampling, until 12 monithly samples have.been collected. Sampling should begin following the effective re-issuance date.of this:

permit and s all be representative of all 4 seasons upon.completion. Total Recoverable Arsenic shall be analyzed using EPA method 200.8 or an approved equivalent method with a MQL of 0.5 micrograms/L.

2082:PEP,26070001 13

Total Recoverable Copoer Total Recoverable Copper shall be monitored at Outfall 014 on a monthly basis, utilizing 24-hour compositejsampling, until 12 monthly samples have been collected. Sampling should begin following the effective re-issuance d ite of this permit and shall be representative of all 4 seasons upon completion. Total Recoverable Arsenic shall be anal, zed using EPA method 200.8 or an approved equivalent method with a MQL of 1.0 micrograms/L.

Once the monitoring for Total Recoverable Iron, Total Recoverable Arsenic and Total Recoverable Copper has been completed, a report shall be submitted to MDEQ listing the analytical result and date of all sampling eventi. This report shall be sent the Environmental Permits Division and should not be combined with the Discharge Monitoring Report (DMR) submittal. The NPDES permit may be modified if data indicates a violation of water quality standards.

MONITORING TYPE AND FREQUENCY

" "Total residual Chlorine (TRC)" shall be measured at Outfalls 007 and 010 twice per month utilizing drab sampling and reported on a monthly basis. TRC shall be measured at Outfall 016 twice per quarter utilizing grab *ampling and reported on an annual basis.

" "Free Available Chlorine (FAC)" shall be monitored at Outfall 001 during outages when the Natural Draft and Auxiliary Cooling Towers have no load and the Plant Service Water (PSW) bypasses the tower and discl arges directly to the Discharge Basin through outfall serial no. (OSN) 001, which shall be monitored continuously with multiple grab samples taken every 30 minutes following commencement of the bypass until no chlorine is detectabli; Outfall 002 continuously utilizing multiple grab samples and reported on a monthly basis. Multiple grab sampling hall consist of a series of grab samples taken every 30 minutes following startup of blowdown following chlorine addition until not chlorine is detectable; Outfall 004 and 005 once per batch discharge during operation utilizing multiple grab samples and reported on a monthly basis. Monitoring shall be performed daily whenever a batch is dischargedf Initiation of discharge shall not occur until a series of instantaneous reading indicate the discharge shall be in compliance with permit limitations. Multiple grab sampling shall consist of a series of grab samples taken every 30 minites following startup of blowdown following chlorine addition until not chlorine is detectable.

• "Chlorination duration" shall be monitored at Outfalls 001, 002,004,005 daily and reported on a monthly basis.

• "Flow" shall be monitored at Outfalls 001 continuously utilizing pump logs and reported on a monthly basis; Outfall 002 twice per month utilizing instantaneous sampling and reported on a monthly basis; Outfalls 004, 00S and 006 once per batch discharge during operation using instantaneous sampling and reported on a monthly basis; Ou fall 007 twice per month utilizing instantaneous sampling and reported on a monthly basis; Outfall 010 continuou ly utilizing a continuous recorder and reported on a monthly basis; Outfall 011 continuously utilizing a pump log anc reported on a monthly basis; Outfall 013 quarterly utilizing instantaneous sampling and reported on an annual basi; Outfall 014 quarterly utilizing instantaneous sampling and reported on an annual basis.

2082 PER20070001 14

• "Total Recoverable Zinc" shall be monitored at Outfall 002 twice per month utilizing 24-hour composite sampling and reportedon a monthly basis;. Outfall 013 and 014 monthly utilizing 24-hour composite sampling and reported. on a quarterly basis; Outfalls 004 and 005 once per batch discharge during operation utilizing composite.

.sampling and reported on a monthly basis. If the basin has been re-circulated for a timeframe ofno less than four (4) hours to-allow for adequate mixing with each quadrant, a composite will be defined as the combined sample ofthe four (4) grab samples from each: quadrant of the basin. If the basin is not re-circulated for a sufficient period of time to allow for adequate mixing within the quadrants, a composite will be defined as the combined sample of the three (3).

individtal samples collected at the beginning, middle, and end of the discharge for each batch discharge.

S *"Total Recoverable Iron" shall be monitored at Outfall 013 monthly utilizing 24-hr composite sampling until 12 monthly, samples have been collected. Upon completion of the monitoring, the monitoring results shall be submitted to MDEQ within 2 years from the effective issuance date of the permit.

"Total Recoverable Copper" shall be monitored at Outfall 014 monthly utilizing 24-hr composite samplinguntil 12 monthly samples have been collected. Upon completion of the monitoring, the monitoring results shall be submitted to MDEQ within 2 years from the effective issuance date of the permit.

a"Total Recoverable Arsenic" shall be:monitored at Outfall 014 monthly utilizing 24-hr composite sampling until 12 monthly samples have been collected. Upon completion of the monitoring, the monitoring results shall be submitted to MDEQ within 2 years from the effective issuance date of the permit.

"Oil and Grease"! shall be monitored at Outfall 006 once per batch discharge during operation utilizing grab sampling and reported on a monthly basis; Outfall 007 twice per month utilizing grab sampling and reported on a monthly basis.

&"PH"shall be monitored at Outfalls 001 weekly utilizing grab sampling and reported on a monthly basis; Outfal1010 twice per: month utilizing grab sampling and reported on a monthly basis: Outfall 01 3 and 014 quarterly utilizing grab sampling and reported on an annual basis.

• "Temperature (Deg. F)" shall be monitored at Outfall 001 continuously utilizing a continuous recorder and reported on a monthly basis.

0 "Fecal Coliform" shall be,monitored at Outfall 0 !0 twice per month utilizing grab sampling and reported on a monthly basis.

• "Biochemical oxygen demand, 5-day" shall be monitored at Outfall010 twice per month utilizing 24-hour composite sampling and reported on a monthly basis..,

a "TSS" siall be monitored at Outfall 007 twice per month utilizing grab sampling and reported on a monthly basis; Outfall (d10 twice per month utilizing 24-hour composite sampling twice per quarter and reported on a monthly basis; Outfall 011 once per month utilizing grab sampling and reported on a monthly basis; Outfall 013 and 014 quarterly 2082 PER20070001. 15

utilizing grab sampling and reported on an annual basis.

XII. BASIS FOR PROPOSED PERMIT LIMITATIONS Total Suspended Solids (TSSM The average and maximum TSS limits of 30 mg/I and 45 mg/I are based on secondary treatment standards and engineering judgment. Secondary treatment standards describe the minimum effluent quality attainable by econdary treatment for sanitary wastewater [40 CFR 133.102].

At Outfall 011 the average and maximum TSS limits of "Report" and 30 mg/I are based on engineeringjud ment. At Outfalls 013 and 014 the average and maximum TSS limits of "Report" are based on engineering judgmei t.

Oil & Grease The average and maximum effluent limit of 15 mg/I and 20 mg/I are categorical limitations defined in 40 CfR 423.12 (BPT) for low-volume wastewater.

Total Residual Chlorine (TRC)

The average and maximum TRC limits of "Report" and 0.5 mg/I placed on outfalls 010 and 016 are based on engineering judgment.

At Outfall 004, the average and maximum "Report" only limits is based on engineeringjudgment.

Chlorination Duration The duration of chlorination limit of 120 minutes per day per unit is a categorical limitation defined in 40 CFR 423.12 (BPT) and 40 CFR 423.13 (BAT).

Temperature (EF)

The average and maximum temperature limit of "Report" only is based on engineering judgment.

Thermal Mixing Zone The receiving water shall not exceed a maximum water temperature change of2.8 degrees Celsius (5.0 degrees Fahrenheit) relative to the upriver temperature, outside a mixing zone not exceeding a maximum width of 60 feet from the river edge 2082 PER20070001 16

and a maximum length of 6,000 feet downstream from the point of discharge, as measured at a depth of 5 feet. The river edge shall be defined as being no further east than the mouth of the barge slip. The maximum water temperature shall not exceed 32.A degrees Celsius (90 degrees Fahrenheit) outside the same mixing zone, except then ambient temperatures approach or exceed this value.

Thermal MWdeling:

Thermal monitoring shall be performed any time the river stage is less than 0.5 feet (Vicksburg gauge) during winter months (November-April) or, is less than minus 1.2 feet (Vicksburg gauge) during the summer months (May-October). If these conditions occur and the plant is generating power, monitoring shall be performed upriver at PT. I (surface/5 feet sub-surface), Discharge Outlet, Barge Slip Outlet, and down river at PT.7. However, once monitoring has been performed at river stages less than those cited (0.5 feet during the winter months and minus 1.2 feet during the summer months), the river stages which existed at the time of thermal modeling, will then become the standard river stage during which a subsequent monitoring exercise must be performed if the river falls below that stage. Thorough documentation shall be maintained ?n file of the river stage during each period of thermal monitoring. This policy is subject to modification if any data collected during a particular stage indicates temperature variations not previously measured. Additionally, thermal monitoring shall be performed during the winter of 2013/2014 and the summer of 2014. Results shall be included with the application for permit re-issuance. Agreement regarding specific conduct of the thermal monitoring shall be determined prior to implementation.

Biochemical Oxygen Demand - 5 day (BODs)

The average and maximum BOD9 limits of 30 mgfl and 45 mg/I are based on secondary treatment standards and engineering judgment. Secondary treatment standards describe the minimum effluent quality attainable by secondary treatment for sanitary wastewater [40 CFR 133.102].

Fecal Coliform Fecal colifo*m limits are water quality based effluent limits (WQBELs) defined in section 111.4 of WPC-2 for streams classified as!"Fish and Wildlife". For the months of May through October (summer), fecal coliform shall not exceed an average conrentration of 200 colonies per 100 ml and a maximum concentration of 400 colonies per 100 ml. For the months of November through April (winter), fecal coliform shall not exceed an average concentration of 2000 colonies per 100 ml and a maximum concentration of 4000 colonies per 100 ml.

Total Recoverable Zinc The average and maximum total recoverable zinc limits of 1.0 mg/i are categorical limitations defined in 40 CFR 423.13 (BAT) for cooling tower blowdown.

i 2082 PER20070001 17

The total recoverable zinc maximum limit of 0.065 mg/I is a WQBEL determined using the State of Mississippi Water Quality Criteria (WPC-2). This limit was established because the permittee failed the acute toxicity screen ?erformed on zinc monitoring data provided in compliance with Part I condition B.! (a) of the current permit.

Total Recoverable Iron The permittee failed the total iron acute toxicity screen because ofa variability factor, i.e. only one sample wa; provided on the application. Based on engineering judgment, the applicant will be required to monitor Outfall 01until 12 monthly effluent samples that are representative of all 4 seasons have been analyzed. If this data indicates a 5olation of water quality standards, the NPDES permit may be modified.

Total Recoverable Arsenic The permittee failed the total arsenic acute toxicity screen because of a variability factor, i.e only one sample was provided on the application. Based on engineering judgment, the applicant will be required to monitor Outf4 014 until 12 monthly effluent samples that are representative of all 4 seasons have been analyzed. If this data indicates violation of water quality standards, the NPDES permit may be modified.

Total Recoverable Copper Only one analysis was performed and reported on the renewal application for total copper. Using tht reported concentration, Outfall 014 failed the acute and chronic toxicity screen. Instead of establishing a water quility based effluent limit (WQBEL) based on I analysis, the applicant will be required to monitor Outfall 014 until 1 monthly effluent samples that are representative of all 4 seasons have been analyzed. If this data indicates a violatio* of water quality standards, the NPDES permit may be modified.l pHH The minimum and maximum pH effluent limits of 6.0 s.u. and 9.0 s.u. are WQBELs that reflect the WPC-2 requirement for the normal pH of waters to be 6.0 to 9.0.

2082 PER20070001 18

126 Priority Pollutants Certification The permittee shall certify, not less than once per year (with the DMR on January 28 'hof each year), that chemical products added for cooling tower maintenance, including such chemical used for corrosion inhibition, do not result in the discharge via cooling tower blowdown of any of the 126 priority pollutants (including but not limited to chromium and zinc) in detectable concentrations. Additionally, once for each product used for cooling system and/or boiler maintenance, compliance shall be demonstrated by submission of certification from the manufacturer that such product contains no priority pollutants The additioi of any chemical product to the cooling system and/or the boiler system other than those submitted with the application is prohibited unless prior written approval is obtained in accordance with condition S-9 on page 7 of this permit. Chemicals used for the maintenance of cooling water chemistry and boiler water chemistry, or otherwise to operate or maintain these systems, shall not cause a violation of the terms and conditions contained in condition S-I on page 4 of this permit.

2082 PER20070001 19

ATTACHMENT A EPA APPLICABLE CATEGORICAL GUIDELINES 423.12 Best Practicable Control Technology Currently Available (BPT)

(I) The pH of all discharges shall be within the range of 6.0- 9.0.

(2) There shall be no discharge of polychiorinated biphenyl compounds.

(3) The quantity of pollutants discharged fromlow volume-waste sources (Outfalls 006 and 007) shall not eXceed the quantity determined by multiplying the flow of low volume waste sources times the concentrationlisted in the following table:

BPT effluent limitations Pollutant or Pollutant Property Maximum for any I day Average of daily values for 30 (mg/I) consecutive days shall not exceed (mg/l)

TSS ............................................ 100.0 30.0:

Oil and grease.... ...................... 20.0 15.0 (The facility does notgenerate bottom ash orfly ash. Therefore, 423.12(b)(4) doesnot apply (The facility does not generate metal cleaningwastes. Therefore, 423. 12(b)(5) does not apply.)

(The facility does not have once-through cooling water. Therefore;423.12(b)(6) does not apply.)

(4) The quantity of pollutants in cooling tower blowdown (Outfalls 002. 004 and 005) shall not exceed the quantity determined by multiplying the flow ofonce through cooling water sources times the concentration listed in the following table:

BPT effluent limitations Pollutant or pollutant property Maximum 1 Average concentration concentration (mg/I) (mg/I)

Free available chlorine. ........... .... 0.5 mg/L 0.2 mg/L 2082 PER2007000 i 20

BAT effluent limitations Average of daily,values Pollutant or Pollutant. Property Maximum for any I day for 30 consecutive days

,_,(mg/i) Shall not exceed.(mg/i)

The 12 6 priority pollutants contained in chemicals added for cooling tower No detectable amount No detectable amount.

maintenance, except:

Chromium, total ....................... 00......

,06.2 Zincý total ............... .... 1.0 1.0 (5) Neither free available chlorine nor total residual chlorine may be discharged from any unit for more than two hours in any one day (120 min) and not more than one unit in any plant may discharge free available or total residual chlorine at any one time unless the utility can demonstrate to the Regional Administratoror State, ifthe State has NPDES permit issuing authority, that the units in a particular location cannot operate at or below this level of chlorination.

(Thisfacility does not have coal pile, therefore 423.1(b)(9) and (10) do not apply)

(6) At the permitting authority's discretion, the quantity of pollutant allowed to be discharged may be expressed as a concentration limitation instead:of the mass based limitations ofthis section, Concentration limitations shall be those; concentrations specified in this section.

(7) In the event that waste streams from various sources art combined for treatment or discharge, the quantity of each Pollutant or pollutant property controlled shall not exceed the specified limitation for that waste source.

423.13 Best Available Technology Economically Achievable (BAT)

(8) There shall be no discharge of polychlorinated biphenyl compounds.

(The facility does not.have once-through cooling water. Therefore, 423.13(b) and (c) does not apply.).

(9) Totalkresidual chlorine may not be discharged from any single generating unit for more than two hours per day unles§ the discharger demonstrates to the permitting authority that a discharge for more than two hours is required for macro invertebrate control. Simultaneous multi-unit chlorination is permitted.

(10) The quantity of pollutants discharged in cooling tower blowdown (Outfall 002, 004 and 005) shall not exceed the qtantity determined by multiplying the flow of cooling tower blowdown times the concentration listed in'the following table:

2082 PER20070001 21

BAT effluent limitations Maximum concentration Average concentration Pollutant or Pollutant Property (mg/I) (mg/I)

Free available chlorine ................ 0.5 mE 0.2 mg&

(11) Neither free available chlorine nor total residual chlorine may be discharged from any unit for morethan two hours in any one day (120 min) and not more than one unit in any plant may discharge free availab e or total residual chlorine at any one time unless the utility can demonstrate to the Regional Administrator or S ate, if the State has NPDES permit issuing authority, that the units in a particular location cannot operate at or I elow this level of chlorination.

(12) The quantity of pollutant allowed to be discharged may be expressed as concentration limitations instcid of mass based limitations.

(13) In the event that waste streams from various sources are combined for treatment or discharge, the quant ofeadh pollutant or pollutant property controlled shall not exceed the specified limitation fbr that waste source.

2082 PER20070001 22

ATTACHMENT B TOXICITY SCREENING Grand Gulf Nuclear Station has three external discharge points. Outfall 001 is a combination of internal outfalls 002, 004, 005, 006 and 0 11 that discharges directly into the Mississippi: River. Outfall 013 consists of the combined discharge from the Bechtel Shop; vehicle maintenance shop; Ice House Condensate; Standby Service.

Water Leakage; Construction and Site Runoff; Once-through cooling Water; site processing facility HVAC; Internal Outfall 010 (Sanitary); Internal Outfall 016 (Energy SerVice System) which discharges to Hamilton Lake.

Outfall 014 consists of a discharge from sedimentation basin B which includes water from internal Outfall 007; standby service water leakage and releases; intermittent circulation water basin overflows; and stormwater runoff.

Outfalls 004, 005 and 006 are internal outfalls that discharge through Outfall 002 which discharge to Hamilton Lake.

For Outfails 001 QF i 7Qi.0 of receiving stream (Acute Screening) 82,082 MGD Mean annual flow (Human Health Screcning) 653,272.60 MGD

= Maximum 30 day value. flow.

=1 2.95 MGD IWC 100

• Q/(Q, + Qw)

=100" (12.05)/(82,082+12.05) *0.01% (7Q10)

- 100 * (12.05)/(653272.74-12.05) = 0.002 % (Mean Annual)

Because IWC is less than 1 percent, an acute and human health toxicity screen will be performed.

For Outfalls 013 Q, = Receiving Stream Flow

= 0 MGD (7QI 0-Acute and Chronic Screening)

= 5.881 MGD (Mean Annual - Human Health Screening)

Q.. = Maximum 30 day value flow.

= 0.08 MGD (Outfall 013)

IWC (%) = Q. /(Q, + Q.)*i 00 2082 PER20070001 23

= 0.8/(5.881 +0.8)* 100 = 11.97 % (Outfall 013) Mean

= 0.8/(0+0.8)*100 = 100 % (Outfall 013) 7Q10=0 Because IWC is greater than I percent, an acute, chronic and human health toxicity screen will be perfo med.

For Outfalls 014 Q, = Receiving Stream Flow

= 0 MGD (7QI 0-Acute and Chronic Screening)

= 0 MGD (Mean Annual - Human Health Screening)

Q. =-Maximum 30 day value flow.

= 0.07 MGD (Outfall 014)

= 11.64 MGD (Outfall 002 via Outfall 014)

IWC (%) =Qw/(Qr+Qw)*100

= 0.7/(5.881+0.8)* 100 = 11.97 % (Outfall 014) Mean

= 0.7/(0+0.7)*100 = 100 % (Outfall 014) 7QI0=0 Because IWC is greater than I percent, an acute, chronic and human health toxicity screen will be performed.

For Outfall 002 when discharged to Outfall 007 and thence to Outfall 014 During plant outages when the Circulating Water System is drained, there is a portion of the Circulating Water System that cannot be discharged via Outfall 002. This portion of effluent is manually pumped into the 100-year storm ditch and discharged via Outfall 007 (thence to Outfall 014). To predict if there would be a violation to water quality, a toxicity screen for this discharge was performed on those parameters that were reported at concentration above the minimum quantification levels (MQL's). Because this effluent is normally part ýf Outfall 002, a toxicity screen for this discharge was performed for using the data provided on the application fo Outfall 002. Since this type of discharge will seldom occur, only an acute toxicity screen is applicable to this dicharge option.

Qr = Receiving Stream Flow

= 0 MGD (7Q I0-Acute and Chronic Screening)

= 0 MGD (Mean Annual - Human Health Screening)

Qw = Maximum 30 day value flow.

= 11.64 MGD (Outfall 002 via Outfall 014)

IWC (%) =Q, /(Q, + Qw)*100

= 11.64/(0+1 1.64)*100 = 100% (Outfall014) Mean 2082 PER20070001 24

=1 .64/(0+11,64)*100= 100% (OutfalO104)r7Q10"0 xr = Receiving stream concentration.

X Historical effluent data.from the application.

X = Permit limits from previous permit or from effluent guidelines.

X,.. The calculated instream concentration based on existing permit limits or the calculated limit based on current effluent guidelines.

X, 'The calculated instream concentration based on historical effluent data from the application (o.*

a= + (o.*X)

(Q,.+ Q+)

To calculate Xt substitute X,.for X,..

Until 12 samples can be. analyzed, the effluent is multiplied by 10 as seen in the following equation::

x, Q, *x,)+o*X 10)

(Q,.+ Q,)

To ensure that the each pollutant limitation would protect water quality, the pollutant .limitations were evaluated in the toxicity screen as well. To view screening results, see the toxicity screening. tables on the following pages.

2082 PER20070001 25

Ouffall 001 Chemical Specific Screening (Using data from the Form 2C Application)

Ir (river, mean annual) = 653272.70 MGD IWC: 100,* [Qwl(Qr+Qw)] %

Or (river, 7Q10) = 82082.00 MGD IWC (mean) 0.002 !%

ow (effluent) = 12.05 MGD IIWC 7Q10)= 0.01  %

Water Quality Acute Screen: (Ouffall 001)

Xt = f((r x Xr) + (Ow x (Xw11 / (Or.+ Qw* Conc. in ua/1. unless otherwise stated.

Assuming Xw x t AssumIng Xw x I WQ Criteria P,,, Xw (less than) Xw Xr Xt. where QrwQ1O Xt, whom QrO 7Q10 Acute tdonc.;I67EffluM)i Cons. In Eftluf Cons.4tii inxng ~

0'~ Cqe 1 ~ P sfal Zinc, Total .. 356 0 0.052255 . Pass 0.522547 Pass 65J000, Water Quality Human Health Screen: (Outfall 001)

Xt =[(Or x Xr) + (Qw x (Xwfl I (Or + Ow) Conc. in ug/I, unless otherwise stated.

Xt_=__(__xr) ( __ _wx_(Xw)__I_(_r_+ __w) _......_ *Assuming Xw x I AssumInq Xw x 10 WO Criteria Xw (less than) Xw Xr XA, where Qr mean XA, where Or. mean Human Health Parameter " coh... Eu onei ,o*o:

Ioluene (con. i4 RW) f erR*) ie) (Cn. n.i"ssail Arsenic, Total 2 0 0,000037 Pass 0.000369 Pass 0.0780 Mercury, Total 0.0063 0000000

.0 Pass 0.000001 .. Pass 0.151 "

Zinc, Total 356, 0 0,006567 Pass 0.065665 Pass 5000,0000 BIs(2-ethylhe*xf)pthaiata 0.017 0 0o00000 Pass 0.000003 Pass 2.2 2082 PER20070001 -26

Outfall 013 Chemical SpecificScreening (Using data from the Form 2C Application)

Qr (river,.mean annual) =, 6.881484 MGOD lWC:.. 100 * [Ow/(Qr, Qw)] %

Qr (river, 7Q10) = 0.00 MGD lWC (mean) = 11.97 %

Qw (effluent) = 0.8 MGD Iwc (7010) = 100a0 iI1%

I l " l i Water Quality Acute Screen: (Ouffal! 013):

An acute screening. could not be performed because there are no acute water quality standards available for the pollutants subject to the screening.

Water Quality Chronic Screen: (Outfall 013)

Xt = Qr x Xr)+ (Qw x (Xw)/I (Qr + Qw) Conc. in ug/l, unless otherwise stated.

Assuming Xw x I Assuming Xw zI Critera Xw (less then) Xr Xt, where Or z 7Q10. Xt. where Or: 7Q10 Acute Pearareter ......Con. InEffluent) * .Conc* inEflu)

E (Conc.cAt iron, Total 270 0 270.000000 Pass 2700.000000 Fall 1000.0 Water Quality Human Health Screen: MOuffalO 013)

Xt [(= r x Xr) + (Qw x I / (Qr + Qw) Conc. in ugn, unless otherwise stated.

Assuming Xw x I AssumIng Xwx 10 WO Criteda IXw (loss than) Xw X xA where Or = mean Xt, whore Or=.mean H.uman Health Par-ymter ... .. . In Eum`i) nc°.I un)`` .I` fie)oo. Alr bd"ng) PassafFai (.or. A*t*r Mixing), PS& ,.-a.:.S L Arsenic, Total 12 0 i.436807 Pass 14.388066 Pass 24.0000 Mercury, Total _ 0.002 0 .0.002000 Pass 04020000 Pass 0.151 Zinc, Total 356 0 42.625261 Pass 426.252611 Pass 5000.0000 Bis(Z4thylhexyllpthalate 0.01v 0 0,002035 Pus 0,020355 Pan 2.2 2082 PER20070001 27

Outfall 013 Chemical Specific Screening (Using August 1, 2004 Monitoring Submittal) r.(river, mean annual) q 5.881484 MGD IWC: 100' iQw/(Q 1*w9] . %

Qr (river, 7Q10) = 0.00 MGD If= (mean) =

11.97 1W Qw (effluent) = 0.8 MGD JIWC (7Q10 = 100.00 ] yo Water Quality Acute Screen: (Outfall 013)

Xt = [(Or x Xr* + (Ow x )]/11 (Or + Ow) Conc. in uall. unless otherwise stated.

.Assuming Xw x -. AssuminXwx10 WQ Criteria Xw (less than) Xw Xr Xt, where Or'= 7010 XA, where Qr 7010 .Acute

.,;.. ,,,,,,,ro ,,,,,,,,,o, InEffluene) (Corc. inoncln ek In.: iP.,) (Con,.A MWag) 'Pa&sFai jCoi

• Mar *Mxn PasaI -

Zinc, Total ,, 0 94.000000 Fall ... 65.0 Zinc, Total 0.066 0 0.065000 Pass - - 65.0 Water Quality Chronic Screen: (Ouffall 013)

Xt = [(Qr x Xr) + (Qw x (Xw)] / (Qr + Qw) Conc. inughl, unless otherwise stated.

"_"Assuming Xw x I Assuming Xw x 10 Wo Criteria

• ~~~ Xw~ (less 1::&than)

.."* ..:I.i::n=fU 6, t "1 ) "-cinXr .ýn . XA, where

(~n.-- M7Q10

.*.. OQr 'g' -. = XA,

• where Qr = 7010

_-.* -i:

-"--3*: *

• Acute

I-i Zinc, Total 8: 0 8.000000 Pass - - 65.0 Zinc, Total (Limit) 65 0 65.000000 Pass - 65.0 The following total zinc data was provided on the August 1,2004 monitoring submittal:

Maximum Daily Value 94 ug/Il Maximum 30-day Value 94 ug/

Long Term Average 8.ugIl 2082 PER20070001 28

Assuming Xw x I Assuming Xwxl10 WQ Criteria Xw (less than) Xw Xr XL. where Qr= 7010 Xt, where Or= 7010 Acute Copper. Total 10 0 10.000000 Fall 100=000000. Fail 7.000 Copper, Total (Limit) 7 0 7.000000 Pass - - 7.000 Water Quality Chronic Screen: (Outfall 014)

Xt =M(Qr x Xr) + (Qw x Xw)./ (Qr + Qw) Conc. in uq/i, unless otherwise stated.

...... _Assuming Xw x I Assuming Xw x 10 WO Criteria Xw (less than) Xr Xt, where r = 7010 Xt where Qr = 7Q10 Acute Copper, Total 100 0 10,000000 Fail 10M000000 Fall 5.0 Copper, Total (Limit) 5 0 5.000000 Pass - - 5.0 Iron, Total: 100 0 100.000000 1 Pass 1000,000000 1 Pass 1000.0 Water Quality"Human Health Screen: (Outfall 014)

Xt = Qr x Xr) +.(Qwx (Xw)]/(Qr+Qw) Conc. in ug/i, unless otherwise stated.

... Assuming Xw~x.1. Assuming Xw x 10 WQ Criteria Xw (loss than) Xw Xri XA, where Or = mean xA, where Or = mean . Human Health Parameter InCoo.

,..ssm Effliqent} tConc. In Effluent. (Coc. InRivet)R ,c(Con After MWng) Pas/Fatj iI (C Ae "4 ).j Paal . .....

.Arsenic. Total 15 0 15.000000 Pass 150.000000 Fall 24.0000 Copper, Total 10 0 '10.000000 Pass 1 00.000000 Pass 1000.0000 2082 PER20070001I 29

Ouffall 014 Chemical Specific Screening (Using August 2004 Monitoring Submittal)

Qr (river, mean annual) = 0.00 MGD IWC: 100 * [Qw/(Qr+Qw)]

Qr (river, 7Q10) = 0.00 MGD lIwc (mean)= 100.00 I

. Qw (effluent) = 0.07 MGD WC 7010= oo100.00 1 Water Quality Acute Screen: (Outfall 014)

Xt =Qr x Xr) + (Ow x (Xw I/ (Qr + Qw) Conc. in ugI, unless otherwise stated.

Assuming xw x I Assuming Xw x 10 Wo Criteria Zinc, Total Zinc, Total (Limit) j0065 Xw (lass than) xw 69 Xr 0

0 At where Qr =7010 69.000000 0065000 Fal Pass At where Or = 7010 I -

Acute 65.0 65.0 Water Quality Chronic Screen: 1Ouffall 014)

Xt = .[Qrx Xr) + (Qw x (Xw i/(Qr + Qw) Conc. in ug/l, unless otherwise stated.

__Assuming Xw x I Assumin xw x 10 WO Criteria Xw (less than). X At, where OrzTQI0 Xt. where Or= -410 Acute Zinc, Total _$ 0 9.000000 Pass - - 65.0 Zinc, Total (Um.t) 0.065 0 0.065000 Pass .. . . 65.0 Water Quality Human Health Screen: (Ouffall 014)

Xt (Qr x Xr) + (Qwx (X )A/ (Qr +Qw) Conc. in u/i£ unless otherwise stated.

_Assuming Xw x I Assuming Xw x 10 - WO Criteria Xw (less than) Xw Xr Xt where Or = mean It, where Qr= mean _ _ Human Health Paameter..t .s,. .a-.W, (Conc. Afte*r iP.l "i aAr .l Zinc, Total 9 0 9.0000D s - - 000.0 The following total zinc data was provided on the August 1, 2004 monitoring submittal' Maximum Daily Value 69 ug/h Maximum 30-day Value 69 ug/I Long Term Average.. 9 ug ).....

2082 PER20070001 30

Outfall 002 When Portions Are Drained to Outfall 007 thence 014 ir (river, mean annual).: 0.00 MGO IWC:Ien Qr (*iver, 7Q10) -040;MGD Qw (effluent) : 11.64 MGD IIWC (7QI 0)=

li li - 4 I'

Water Quality Acute Screen: (Outfall 014)

Xt [(Qr x Xr)+ ,(Qw x (Xw)] I (Qr + Qw) Conc. in ug/n. unless otherwise stated.

Assuming Xw x I Assuming Xw x 10 WO COrfrta Xw (less than) Xw Xr ,Xt.where Qr= 7010 Xt%where Qr=a 7010. Acute Zinc, Total 730 0 780.000000 Fall 7800.000000 Fall 66.000 Nickel, Total 4 0 .8.000000 I Passt 80.000000 Pass 280.0 During plant outages when the Circulating Water System is drained, there is a portion of the Circulating Water System that cannont be discharged via Outfall002. This portion of effluent is manually pumped into the 100-year storm ditch and discharged via Outfall 007 (thence to Outfall 014). To, predict if there would be a violation to water quality, a toxicity screen for this discharge was performed on those parameters that were: reported at concgntration above the mimimum quantification levels (MQL's). Because this. effluent is normally part of Outfal1 002; a toxicity screen for this discharge was performed for using thedata provided on the application for Outfall. 002.

An acute toxicity screen could not be performed on Iron, Magnesium, Arsenic and Mercury because there are no acute water quality criteria available, for these parameters. Because this type of.discharge is not routine, there should not be any chronic or human health impacts. Therefore, a chronic and human health, screen will also not be performed for the aforementioned parameters.

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