Permit No. UT0000051 STATE OF UTAH DIVISION OF WATER QUALITY DEPARTMENT OF ENVIRONMENTAL QUALITY SALT LAKE CITY, UTAH AUTHORIZATION TO DISCHARGE UNDER THE UTAH POLLUTANT DISCHARGE ELIMINATION SYSTEM (UPDES) Incompliance withprovisions ofthe Utah Water QualityAct, Title 19, Chapter 5, Utah Code Annotated ("UCA '') 1953, as amended (the

**''Act'~,** KENNECOTT UTAH COPPER LLC is hereby authorizedto dischargefrom its facilitylocatednearMagna and in western SaltLake County, Utah, with the outfalls located at the following: Outfall Latitude Longitude To receiving waters named 002 40° 44'30" 112 ° 05'15" C-7 Ditch 004 40° 44'06" 112° 11'49" I-80 Culvert to Great Salt Lake 005 40° 36'30" 111 ° 55'20" Jordan River 007 40° 46'15" 112 ° 07'00" C-7 Ditch 008 40° 44'12" 112° 10'25" Great Salt Lake 009 40° 32'07" 112° 11'39" Pine Canyon Creek, Tooele County 010 40 ° 29'33" 112 ° 07'20" Butterfield Creek 011 40° 42'52" 112 ° 06'57" Ritter-Utah Salt Lake Canals 012 40° 45'20" 112 ° 10'02" Great Salt Lake SW3 40° 42' 02" 112 ° 06'38" Little Valley 'Wash SW4 40° 32'51" 112 ° 12'22" Pine Canyon Creek, Tooele County in accordance with discharge points, effluent limitations, monitoringrequirements and other conditions set forth herein. This modified permit shall become effective on November 12, 2009. This modified permit and the authorization to discharge shall expire at midnight, January 31, 2012. Signed this 12th day ofNovember, 2009.

alter L. Baker, P.E. Executive Secretary Utah Water Quality BoardPermit No. UTOOOOOSl TABLE OF CONTENTS Page No. I. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS ............................................... .. ... ............ ..3 A. De:fmitions ....................................................................................... ...............................................3 B. Description ofDischarge Points
.... .. ............. ...... ......... ........ .. ....... .......... .. ... ........... ..... .... ....... ... .. .. .? C. Narrative Standard................................................. .. ................................................................... ... .S D. Specific Limitations and Self-monitoring Requirements
................................. ...................... ... ..... .S E. Storm Water Pollution Prevention Plan
... ..... ... ......... ..... .... ....... ......... ....... .. ... .... .... ............ ........ ...22 II. MONITORING, RECORDING AND REPORTING REQUIREMENTS ...............................................................34 A. Representative Sampling .................. ...................................................... ......... ...... ....... ... ..... ...... ..34 B. Monitoring Procedures ........ ................................... ...... .. ....................................... .. ..... .. ..............34 C. Penalties for Tampering....... .................................. .......................................................................34 D. Reporting ofMonitoring Results ....... ................... ... ..... ...... .. ...... .. ..... ..... ... ..... ...... .......... .. ............34 E. Compliance Schedules.......................................... ... ............ ............................ .. .... .. ...... ............. ..34 F. Additional Monitoring by the Permittee.......................................................................................34 G. Records Contents......................... .. .... ....... ..... ........ ......................... ..... .. ...... ..... ... .. .... ..... ..............35 H. Retention ofRecords ....................................................................................................................35 I. Twenty-four Hour Notice ofNoncompliance Reporting.................. .. ..........................................35 J. Other Noncompliance Reporting........................... ............. ...... ............................ ........ .. ... ... ........36 K
. Inspection and Entry..... ....... ...... .. ..... .................................. ............... .............. ...... .. .... ... ...... ........36 ill. COMPLIANCE RESPONSIBILITIES ..... ....... .................. ... ...... .. ....... .... .. ..... ...... ... ....................... .......... ..... .. .. .. .....37 A. Duty to Comply ............................................................................................................................37 B. Penalties for Violations ofPermit Conditions ....... ..................... ..................................................37 C. Need to Halt or Reduce Activity not a Defense..... .......................................................................37 D. Duty to Mitigate
.. .. ...... .... .... ... ... ...... ... ........... ..... .... ........ .. ... ...... ..... .. .. .. ... .. ............ .... .... ... ...... ..... ..37 E. Proper Operation and Maintenance ..............................................................................................37 F. Removed Substances
... ... .. .... .. ....... ...... ............ .... .. .... ... .... ... ..... ... .. ........ ....... ......... ..... ... ......... .... ..37 G. Bypass ofTreatmentFacilities
........ .... .. ....... .. .... .. ......... ..... ...................... ......... ... ... ...... ... ....... .....37 H. Upset Conditions
.......... .. ........ .... ........... ............. ................... ... .. .......... .... .... .... ........ ... ...... .... ... ....3 8 I. Toxic Pollutants
...... .... .... .. .. ... ... .... ...... ... ..... .. ........... .. ... ... .... ........ .... ....... ................... ... ................39 J. Changes in Discharge ofToxic Substances
.... .... ............ .. ..... ... .............. .... ... ...... ........ ... .... ... ..... ..39 K. Industrial Pretreatment ................................... ....... ..................................................................... ..40 IV. GENERAL REQUIREMENTS
... ....... .... .. ........................... ....... ....... .............. .... ... ............... .................... ...............41 A. Planned Changes.......... ..,..... ...... ..................................................................... .. ............. ............. ..41 B. Anticipated Noncompliance .................................. ..... ...... ...... .............................................. ........41 C. Permit Actions ............................................................................................................................ ..41 D. Duty to Reapply............................................................ ....... ....... .................... ...:........................ ..41 E. Duty to Provide Information.........................................................................................................41 F. Other Infonnation
..... ..... .... .............. ...... ..... .... ........ ...... ... .. .. ....... ..................... ... ..........................41 G. Signatory Requirements
.............. ............. .............. .. ............ .........................................................41 H. Penalties for Falsification ofReports............................ .............. ............... ...................................42 I. Availability ofReports ........ .. ... .... .. ...... ....... ... ........ ............. .........................................................43 J. Oil and Hazardous Substance Liability.................. ........ .................... ...........................................43 K. Property Rights .................... .. ........................ ..................... .. ....... ................. ... .............................43 L. Severability..... .. ... ....... ... .... ... ...... ... .... ... ...... .. .. ... ... .. ...... ....... ...... ... .............. ..... .. ...... ............ .. .......43 M. Transfers .............................. .................................. .......................................................................43 N. State Laws .............. ....... ...................................................................................... ................... .. ....43 0. Water Quality-Reopener Provision...... ... ........ ........ ............. .. ..... ....... .................

**~**........ ....... .. ........43 P. Toxicity Limitation -Reopener Provision .....................................................................................44
2Permit No. UTOOOOOSl I. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS A. Definitions 

### 1. The "30-day (and monthly) average" is the arithmetic average of all samples collected during a consecutive 30-day period or calendar month, whichever is applicable. The calendar month shall be used for purposes of reporting selfmonitoring data on discharge monitoring report forms. 2. The "7-day (and weekly) average" is the arithmetic average of all samples collected during a consecutive 7-day period or calendar week, whichever is applicable. The 7-day and weekly averages are applicable only to those effluent

**ch~acteristics** for which there are 7-day average effluent limitations. The calendar week which begins on Sunday and ends on Saturday, shall be used for purposes ofreporting self- monitoring data ondischarge monitoringreport forms. Weekly averages shall be calculated for all calendarweeks with Saturdays inthe month. Ifa calendar week overlaps two months (i.e., the Sundayis in one month and the Saturday inthe following month), the weekly average calculated for that calendar week shall be included in the data for the month that contains the Saturday. 3. "DailyMaximum" ("Daily Max.") is the maximum value allowable in any single sample or instantaneous measurement. 4. "Composite samples" shall be flow proportioned. The composite sample shall, as a minimum, contain atleast four ( 4) samples collected overthe composite sample period. Unless otherwise specified, the time between the collection ofthe first sample and the last sample shall not be less than six (6) hours nor more than 24 hours. Acceptable methods for preparation ofcomposite samples are as follows:

a. Constant time interval between samples, sample volume proportional to flow rate at time ofsampling; b. Constanttime interval between samples, sample volume proportional to total flow (volume) since last sample. For the first sample, the flowrate at the time the sample was collected may be used;

c. Constant sample volume, time interval between samples proportional to flow (i.e., sample taken every "X" gallons offlow); and, d. Continuous collection ofsample,with sample collectionrate proportional 3Permit No. UT0000051 to flow rate. 5. A "grab" sample, for monitoring requirements, is defined as a single "dip and take" sample collected at a representative point in the discharge stream. 6. An "instantaneous" measurement, for monitoring requirements, is defined as a single reading, observation, or measurement. 7. "Upset" means an exceptional incident in which there is unintentional and temporary noncompliance with technology-based permit effluent limitations because offactors beyondthe reasonable control ofthe permittee. Anupset does notinclude noncomplianceto the extent causedby operational error, improperly designed treatment facilities, inadequate treatment facilities, lack ofpreventive maintenance, or careless or improper operation. 8. "Bypass" means the intentional diversion ofwaste streams from any portion ofa treatment facility. 9. "Severe property damage" means substantial physical damage to property, damage to the treatment facilities which causes them to become inoperable, or substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence ofa bypass. Severe property damage does not mean economic loss caused by delays inproduction. · 10. "Executive Secretary" means Executive Secretary of the Utah Water Quality Board. 11. "EPA" means the United States Environmental Protection Agency. 12. "Acutetoxicity" occurs when 50 percent ormore mortality is observed for either test species at any effluent concentration. 13. "Act" means the "Utah Water QualityAct". 14. "Best Management Practices" ("BMPs") means schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent·or reduce the pollution ofwaters ofthe State. BMPs also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage.
4Permit No. UT0000051 15. "CWA" means The Federal Water Pollution ControlAct, as amended, by The Clean WaterAct of 1987. 16. "Flow-weighted composite sample" means a composite sample consisting ofa mixture of aliquots collected at a constant time interval, where the volume of each aliquot is proportional to the flow rate ofthe discharge. 17. "Illicit discharge" means any discharge to a municipal separate storm sewerthat is not composed entirely ofstorm water except discharges pursuantto a UPDES permit (otherthanthe UPDESpermitfor discharges from the municipal separate storm sewer) and discharges from fire fighting activities, fire hydrant flushings, potable water sources including waterline flushings, uncontaminated ground water (including dewatering ground water infiltration), foundation or footing drains where flows are not contaminated withprocess m&terials such as solvents, springs, riparianhabitats, wetlands, irrigationwater, exteriorbqilding wash down where there are no chemical or abrasive additives, pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred and where detergents are not used, and air conditioning condensate. 18. "Landfill" means an area ofland or an excavation in which wastes are placed for permanent disposal, and which is not a land application unit, surface impoundment, injection well, or waste pile. 19. "Land application unit" means an area where wastes are applied onto or incorporated into the soil surface (excluding manure spreading operations) for treatment or disposal. 20. "Point Source" means any discernible, confined, and discrete conveyance, including but not limited to, any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, landfill leachate collection system, vessel or other floating craft from which pollutants are or may be discharges. This term does not include return flows from irrigated agriculture or agriculture storm water runoff. 21. "Runoff coefficient" means the fraction of total rainfall that will appear at a conveyance as runoff 22. "Significant materials" includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic pellets; finished materials such as metallic products; raw materials used in food processing or production; hazardous substances designated under Section 101 (14) of CERCLA; any 5Permit No. UT0000051 chemical the facility is required to report pursuant to EPCRA Section 313; fertilizers; pesticides; and waste products such as ashes, slag and sludge thathave the potential to be released with storm water discharges. 23. "Significant spills" includes, but is not limited to: releases ofoil or hazardous substances in excess of reportable quantities under Section 311 ofthe Clean WaterAct (see 40 CFR 110.10 and 40 CFR 117.21) or Section 102 ofCERCLA (see 40 CFR 302.4). 24. "Storm water" means storm water runoff, snow melt runoff, and surface runoff and drainage. 25. "Time-weighted composite" means a composite sample consisting ofamixture of equal volume aliquots collected at a constant time interval. 26. "Waste pile" means any noncontainerized accumulation of solid, nonflowing waste that is used for treatment or storage. 27. "1 0-year, 24-hourprecipitationevent" means themaximum 24-hourprecipitation eventwith aprobablereoccurrence interval ofonce in 10 years. This information is available in Weather Bureau Technical Paper No. 40, May 1961 and NOAA Atlas 2, 1973 for the 11 Western States, and may be obtained from the National Climatic Center of the Environmental Data Service, National Oceanic and Atmospheric Administration, U.S. Department ofCommerce. 28. "Section 313 water priority chemical" means a chemical or chemical categories that:
a. Are listed at 40 CFR 372.65 pursuant to Section 313 ofthe Emergency Planning and Community Right-to-Know Act (EPCRA) (also known as Title IIIof the SuperfundAmendments andReauthorizationAct(SARA) of 1986); b. Are present at or above threshold levels at a facility subject to EPCRA Section 313 reporting requirements; and
c. Meet at least one ofthe following criteria:

1. Are listed inAppendix D of40 CFR Part 122 on either Table II (organic priority pollutants), Table III (certain metals, cyanides, and phenols) or Table V (certain toxic pollutants and hazardous substances); 6Permit No. UTOOOOSl

n. Are listed as ahazardous substance pursuantto Section 311

### (b)(2)(A) ofthe CWA at 40 CFR 116.4; or iii. Are pollutants for which EPAhas published acute orchronic water quality criteria. SeeAppendix Illofthispermit. This appendix was revisedbased onfinal rulemaking EPApublished inthe FederalRegisterNovember 30, 1994. B. Description ofDischarge Points The authorization to discharge provided under this permit is limited to those outfalls specifically designated below as discharge locations. Discharges at any location not authorized under a UPDES permit is a violation ofthe

### Actand may be subjectto penalties underthe

### Act. Knowingly discharging from an unauthorized location or failing to report an unauthorized discharge may be subject to criminal penalties as provided under theAct. Discharge Points Outfall Number · Location ofDischarge Points Receiving Waters 002 Latitude 40° 44' 30" Longitude 112° 05' 15" Tailings pond outfall to C-7 ditch 004 Latitude 40° 44' 06" Longitude 112° 11' 49" 1-80 Culvert to Great Salt Lake 005 Latitude 40° 36' 30" Longitude 111° 55' 20" Alternate mine water discharge to the Jordan River 007 La titude 40°46' 15" Longitude 112°07'00" Toe Ditch Pond to C-7 ditch 008 Latitude 40°44'12" Longitude 112°10'25" Artesian well water, refinery storm water to the Great Salt Lake 009 Latitude 40°32'07" Longitude 112°11'39" Pine Canyon Tunnel, Tooele County 010 Latitude 40°29'33" Longitude 112°07'20" Butterfield Tunnel to Butterfield Creek 011 Latitude 40°42'52" Longitude 112°06'57" Adamson Springs to the Ritter-Utah Salt Lake Canals 012 Latitude 40° 45' 20" Longitude 112° 10' 02" Tailings discharge to the Great Salt Lake 104 Latitude 40°43'27" Longitude 112°11'50" Internal discharge from Hydrometallurgical Plant SW3 Latitude 40°42' 02" Longitude 112°06'38" Little Valley Wash SW4 Latitude 40°32'51 " Longitude 112°12'22" Pine Canyon Creek, Tooele County C. Narrative Standard It shall be unlawful, and a violation ofthis permit, for the permittee to discharge or place any waste or other substance in such a way as will be or may become offensive such as unnatural deposits, floating debris, oil, scum or other nuisances such as color, odor or taste, or cause conditions whichproduce undesirable aquatic life or whichproduce objectionable tastes in edible aquatic organisms; or result in concentrations or combinations of substances which produce undesirable physiological responses in desirable resident fish, or other desirable aquatic life, or undesirable human health effects, as determined by bioassay or other tests performed in
7PermitNo. UT000051 accordance with standard procedures. D. Specific Limitations and Self-monitoring Requirements 1. Effective immediately and lastingthe duration ofthis permit, thepermitteeis authorized to discharge from 

### Outfalls 002 

### and 007. Suchdischarges shall belimited andmonitoredby the permittee as specified below: 

### EIDuentLimitations, **Self-Monitori~** 

### and Reporting Requirements Outfall 002 

### and 00'1 Discharge

### Lim:itati0ns 

### ID Menit0ring **~equirements** Parameter 

### Maximum Dail y Daily Frequency SamP,le

**Unit~** Monthly Average
**Ma~um** Minimum 

### TYPe Flow NA NA NA Continuous Recorder MGD 

## TSS 20 30 NA 3 X Weekly Composite mg/L

**'f~ta]** 

### As 0.25 0.50 NA 3 XWeeldy Composite mg!L T0tal Cd 0.05 0.10 NA 3 X Weekly Composite mg!L T0tal Cu 0.15 0.30 NA 3 X Weekly Composite mg/L T0tal Pb 0.30 0.60 NA 3 X Weekly Composite mg!L Total Hg 0.001 0.002 NA 3 X Weekly Composite mg!L TetalZn 0.224 0.50 NA Monthly Composite mg!L 

### T

o

ral S
. e e/' 0.012 b/ NA NA Monthly Grab mg!L Total Cyamde 0.1 0.2 NA Monthly Composite mg/L 

### T0tal Dissolve<!l NA NA NA Monthly Composite mg!L

Solids (IDS.) OiJ

**an.~** Gre:ase NA 10 NA dl Composite 

### Dig/L pH NA 9.0 6.5 3X Weekly Grab 

## su
There shall be no untreated sanitary wastewater discharged into the tailings impoundment. There shall be no or floating solids or visible foam in other than trace amounts. N.A.- Not Applicable. a/ See Definitions, 

### Part !A for definition ofterms. b/ 0.012 mg!L is consistent with the requirements ofthe U.S. Army Corps ofEngineers 404 Permit #199450301 and shall not be exceeded at the Lower Lee Creek location north oflnterstate 80 during a discharge from outfalls 002 and 007.
c/ Selenium will be analyzedbythe Kenneconmodified eleniumhydrideprocedure" as approved in the October 24, 1997 letter from Gilberto Lopez of the State ofUtah Bureau ofLaboratory Improvement Modified EPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. 8I 1

_.._ Permit No. UT000051
dl Oil and grease will be sampled when sheen is observed. Samplestakenin compliance withthe monitoringrequirements specified above shall betaken at the outfall to the C-7 ditch prior to mixing with the receiving water. 2. Effective immediately andlasting the duration ofthis permit, thepermittee is authorizedto discharge from 

### Outfall 004. Such discharges shall be monitored quarterly by the permittee for the same parameters as specified in the permit for Outfall 008. Samples taken in compliance with the monitoring requirements specified above shall be taken at the outfall prior to mixing with the receiving water. 3. During the period beginning immediately and lasting through the duration ofthis permit, the permittee is authorized to discharge from 

### Outfall 005 (mine water). The discharge shall be limited and monitored by the permittee as specified: Effluent

### Limitations, Self-M.Qnitorin,g 

### and Revottin Requirements 

### Outfall 005
. ·- Discharg.e
__**Limitation~** a/

**Monit_o~g** Requirements Parameter

**M~imu m**  Daily L>ail y: 

### 'f' reql:lency Sample l:Jnits M onthly

**Avetag~** 

### ,Maximum Minim1!Ill T}'Fe flow NA NA NA Daily or Measured MGD Continuous b/ 

### TSS 20 30 NA 2 X Weekly Grab mg/L

**T~tal** As NA 0.23 NA 2 X Weekly Grab mg/L 

### ! etaLCd 0.0028 0.0198 NA 2 X Weekly Grab mg!L 

### 'fr

o

tal 

### Cu NA 0.12 NA 2 X Weekly Grab mg/L TotalPb 0.063 0.510 NA 2 X Weekly Grab mg/L TotalHg r 0.00006 c/ 0.00077 NA 2 X Weekly Grab mg/L Total 

### Zn 0.75 1.50 NA 2 X Weekly Grab mg/L T0tal 

### Fe NA 3.06 NA 2 X Weekly Grab mg/L Seleruum d/ 0.014 0.056 NA 2 X Weekly Grab mg/L Teta:l IDissoJved NA 1200 NA 2 X Weekly Grab mg/L

Solids 

### 01"DS) Oil ancllliease NA 10 NA e/ Grab mg!L 

### pH NA 9.0 6.5 2 X Weekly Grab 

# su NA- Not Applicable. a/ See definitions Part I.A. for definition ofterms b/ For intermittent discharges, the duration ofthe discharge shall be reported. c/ Kennecott will voluntarily analyze mercury using a low leveltotal mercury analysis. 9Permit No. UT000051 d/ Selenium will be analyzedbythe "Kennecottmodified seleniumhydride procedure" as approved in the October 24, 1997 letter from Gilberta Lopez of the State ofUtah Bureau of Laboratory Improvement, Modified EPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. e/ Oil and grease will be sampled when sheen is observed. There shall be no discharge offloating solids or visible foam in other than trace amounts. There shall be no discharge ofsanitary wastes or leach water from this outfall. Duringthe first week ofdischarge, aluminum and silver shall also be sampled andthe analyses submitted with the first discharge report. 4. Effective immediately and lasting the duration ofthis permit, the permittee is authorizedto discharge from Outfall 008. Such discharges shall be limited and monitored by the permittee as specified below: EffiJtent Limitations, Self-Monitoring and Reportin Requirements Outfall 008 Discharge Lj.mitatipns 

## a;

. Monjtoring Requirements Parameter Maximum Daily Daily 

### SanJJ>le Units ;Moi;ltlllY Average

**!vf~um** Minimwn Frequeney 

### Type Fl0W NA NA NA Quarterly Measured MGD TSS 20 30 NA Quarterly Grab mg/L Total 

### As 0.25 0.50 NA Quarterly Grab mg/L Tota:l Cd 0.05 0.10 NA Quarterly Grab mg/L TotalCu 0.15 0.30 NA Quarterly Grab mg/L Total Pb 0.30 0.60 NA Quarterly Grab mg/L Tota!Hg 0.001 0.002 NA Quarterly Grab mg/L 1'0ta tZn 0.224 0.50 NA Quarterly Grab mg/L Seleniumb/ NA 0.054 NA Quarterly Grab mg/L T0tal Dis oived NA NA NA Quarterly Grab mg/L



### S'01ids 

### (TDS} \ @

### il and Grease, NA 10 NA c/ Grab mg/L 

### pH NA 9.0 6.5 Quarterly Grab 

## su There shall be no floating solids or visible foam in other than trace amounts. N.A.- Not Applicable. a/ See Definitions, 

### Part !A for definition ofterms

10**~** Permit No. UT000051 b/ Seleniumwill be analyzedbythe "Kennecottmodified seleniumhydride procedure" as approved in the October 24, 1997 letter from Gilberta Lopez of the State of Utah Bureau of Laboratory Improvement, Modified EPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. c/ Oil and grease will be sampled when sheen is observed. 5. Effective immediately and lasting the duration ofthis permit, the permittee is authorizedto discharge from Outfall 

### 009. Such discharges shall be limited and monitored by the permittee as specified: · 

### EffluentLimitations, SeH-Monitoring andReportin Requirements Outfall009 D1schatge Limitations a/

**M.~nitering** Requirement$ Parameter

**M~** ,· urn Dail¥ Daily Sample 

### Units MonthlyAverage Maximum Minimum Frequency Type 

### Flew NA NA NA 2 X Yearly Measured MGD 

### TSS 20 30 NA 2 X Yearly Grab mg/L 

### Total As 0.25 0.50 NA 2 X Yearly Grab mg/L 

### T9tal.Ca 0.05 0.10 NA 2 X Yearly Grab mg/L

. :r0'tal Cu 0.15 0.30 NA 2 X Yearly Grab mg/L



### , totaJ,Pb 0.30 0.60 NA 2 X Yearly Grab mg/L 

### TotalHg 0.001 0.002 NA 2 X Yearly Grab mg/L Tq,talZn 0.224 0.50 NA 2 X Yearly Grab mg/L Selenium 

### c/ 0.012 NA NA 2 X Yearly Grab mg/L T0tal Diss0l;ved NA NA NA 2 X Yearly Grab mg/L

**Sol~d~** (TDS) Oil and Grease NA 10 NA b/ Grab mg/L 

### pll NA 9.0 6.5 2 XYearly Grab 

# su There shall be no floating solids or visible foam in other than trace amounts. NA- Not Applicable. 

# w See Definitions, 

### Part !A for definition ofterms. b/ Oil and grease will be sampled when sheen is observed. c/ Seleniumwill be analyzed by the "Kennecottmodified seleniumhydride procedure" as approved in the October 24, 1997 letter from Gilberta Lopez of the State of Utah Bureau of Laboratory Improvement, Modified EPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. 11 

## ..Permit No. UT000051
6. During the period beginning immediately and lasting through the duration ofthis permit, the permittee is authorized to discharge from Outfall 

### 010 (Butterfield Tunnel). The discharge shall be limited and monitored by the permittee as specified: EffluentLbnitations,Self-Monitori.ng and Reporiin Requirements Outfall 

### 010 Pisdhitrge Umitatipns 

### a/ M0nit0ring Requirements Panimeter 

### Maximum Daily Daily 

### Sallilple Units·**Er et:{U~ll** **9Y** Monthly**~**verage 

### Maxmiwn M.i.nimum. 

### TYpe FleW.· NA NA NA Quarterly Measured MGD 

### TSS "'" "'" -...TA 1'\

__ - _ __..,_ ___1
__ ,..., 1 - IT L.V JV 1'jJ-\. '<Uilllt;Uy \.JTiiU lll)yL



### ·Total As NA 0.10 NA Quarterly Grab mg/L 

## ' f'otarca 0.0044 0.015 NA Quarterly Grab mg/L Total Cil 0.050 0.083 NA Quarterly Grab mg/L 

### tQtalFe NA 1.52 NA Quarterly Grab mg/L
']0tal'l>b 0.023 0.100 NA Quarterly Grab mg/L T0tal**H~** 0.00002 b/ 0.00023 NA Quarterly Grab mg/L Te:tal Zn 0.446 0.493 NA Quarterly Grab mg/L 

### $eleniun:t. 

## c t 0.007 0.029 NA Quarterly Grab mg/L 

### J"0taJJ)isse1vecl. NA 1200 NA Quarterly Grab mg/L

Selids 

### (TDS) 

### Qi:l and Grease NA 10 NA d/ Grab mg/L 

### pH NA 9.0 6.5 Quarterly Grab 

## su a/ See definitions Part LA. for definition ofterms. b/ Kennecott will voluntarily analyze mercury using a low level mercury analysis. c/ Seleniumwill be analyzedbythe "Kennecottmodified seleniumhydrideprocedure" as approved in the October 24, 1997 letter from Gilberta Lopez of the State of Utah Bureau of Laboratory Improvement, Modified EPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. d/ Oil and grease will be sampled when sheen is observed. 7. During the period beginning immediately and lasting through the duration ofthis permit, the permittee is authorized to discharge from Outfall 011 (Adamson Spring). The discharge shall be limited and monitored by the permittee as specified:

12 iPermit No. UTOOOOSl



### E(fluentLimitations,

**Self-Monitorin~** 

### andR.ep
. ortin ' Requirements Outfall 011 Qischarge

**Limitations ~**  

### a/
. Monit0ring Requirements Parameter 

### MaximuJll 

### Daicy Baily Sample Umts 

### Monthly

**A~rage** 

### Mmcim.um Minim tun 

### Frequ<mcy Type·

. . Flew NA NA NA Quarterly b/ Measured MGD 

### TSS 20 30 NA Quarterly Grab mg/L 

### T<:>:U!l:As NA 0.013 NA Quarterly Grab mg/L 

### totaiCd NA 0.01 NA Quarterly Grab mg/L TetalCu t 0.15 0.30 NA Quarterly Grab mg/L 

### Total Eb NA 0.01 NA Quarterly Grab mg/L T-0tal Zn 0.224 0.50 NA Quarterly Grab mg/L Selenium e/ NA 0.013 NA Quarterly Grab mg/L Qil aQ,d Grtras_e NA 10 NA d/ Grab mg/L 

## pH NA 9.0 6.5 Quarterly Grab 

## su a/ See definitions Part I.A. for definition ofterms b/ For intermittent discharges, the duration ofthe discharge shall be reported. c/ Seleniumwill be analyzedbythe "Kennecottmodified seleniumhydride procedure" as approved in the October 24, 1997 letter from Gilberto Lopez of the State of Utah Bureau ofLaboratoryImprovement, Modified EPAMethod 7742, EPAMethod 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. d/ Oil and grease will be sampled when sheen is observed. 8. Effective immediately and lasting the duration ofthispermit, the permittee is authorizedto discharge from 

### Outfall 012. Such discharges shall be limited and monitored by the permittee as specified:

13Pe:rmit No. UT000051

EffluentLimitations, Self-Monitoring and Reportin

**~** Re

_ quirements Outfall 012 Diseharge Limitations 

### a/ MonitotiogRequirements Parameter Maximum 

### Daily Daily Frequency

**S~pl**

**e** Units Montbl:Y A;verage Maximum 

### Minimum Type Flow NA NA NA Continuous Recorder MGD 

### TSS 20 30 NA Daily b/ Composite mg/L Total As 0.25 0.50 NA Daily b/ Composite mg/L Total Od 0.05 0.10 NA Daily b/ Composite mg/L Tatal Cn 0.15 0.30 NA Daily b/ Composite mg/L TotalPb 0.30 0.60 NA Daily b/ Composite mg/L Total Hg 0.001 0.002 NA Monthly Composite mg/L Total Zn 0.224 0.50 NA Daily b/ Composite mg/L Seleniumc/ NA 0.054 NA Daily b/ Composite mg/L Tofirl Cyanide 0.1 0.2 NA Monthly Composite mg/L 

## TDS NA NA NA Monthly Composite mg!L 

### nil and

**Greas~** NA 10 NA 

### d! Grab mg/L 

### pll NA 9.0 6.5 Daily Grab 

## su There shall be no untreated sanitary wastewater discharged into the tailings impoundment. There shall be no floating solids or visible foam in other than trace amounts. N.A.- Not Applicable. -g) See Definitions, 

### Part IA for definition ofterms. 

### Q! The monitoring frequency is two times per week when the weekly average flow is between 1 MGD and 5 MGD, three times per week whenthe weekly average flow is between 5 MGD and 10 MGD, five times per week when the weekly average flow is between 10 MGD and 15 MGD, and daily when the weekly average flow is greater than 15 MGD. Measurement frequency is only required weekly when the Sunday through Thursday average flow is less than 1 MGD and the total flow for the week is less than 10 MGD for that discharge. The frequency ofmonitoring may be modified bythe Executive Secretary after oneyear ofmonitoring demonstrates compliance with concentrations below permit limits. · c;j Seleniumwill be analyzedbythe "Kennecottmodified seleP i u.rn hyd.ride procedure" as approved in the October 24, 1997 letter from Gilberta Lopez of the State of Utah Bureau ofLaboratoryImprovement, ModifiedEPA Method 7742, EPAMethod 200.8 or alternative method approved by the State of Utah Bureau of Laboratory 14**l~**

**_.. ~** 

**~**

**~** 

### Permit No. UT000051 Improvement. 

### d/ Oil and grease will be sampled when sheen is observed. Samples taken in compliance withthe monitoringrequirements specified above shall be taken at the outfall to the Great Salt Lake prior to mixing with the receiving water. 

### 9. Effective immediately the permittee is authorized to discharge from 

### Outfall 104 (Hydrometallurgical plant). The discharge lbs/day shall be limited and monitoredbythe permittee as specified below: 

### Effluent

**Limita ion~,**  

### Self-Monitoring and .Reportin[!R.e l:fuirements

**OutfalllO~** Parameter


### Fle:w TSS

**Tot~**

**J' p~al**  

### Cd'

**'f etal**  

### Cu Xotal RID Total ZR Disc:Qax;ge Limitations 

### aJ .M0nit0riflg Requirements Units 

### MctXimV:In Manthly Daily 'M· aximum Fil'equeney Sample .Average 

### Type NA NA Continuous Recorder MGD 236 295 Weekly Composite lb/day 11.2 27.3 Weekly Composite lb/day 1.57 3.93 Weekly Composite lb/day 12.0 25.2 Weekly Composite lb/day 2.56 5.51 Weekly Composite lb/day 8.26 20.1 Weekly Composite lb/day 

### a/ See definitions Part LA. for definition ofterms 10. Except as provided for inPartI.D.11.b ofthe permit, there shall be no discharge ofprocess wastewater to navigable water from the active copper dump leach operations. 11. Storm Exemptions
a. If, as a result of precipitation or snowmelt Outfalls 002, and/or 012 has an overflow or excess discharge of effluent which does not meet the limitations contained in Part I.D.1 and 8, pursuant to 40 CFR440.131(b), Outfalls 002 and/or 012 may qualify for an exemption from suchlimitations ifthepermittee notifies the Executive Secretary ofthe event in writing within thirty days ofthe event and the following conditions are met:
1. The facility is designed, constructed and maintained to contain 6053 acre feet at theNorth expansion impoundment. This is the volume which would be generated by the permittee in a 24-hour period without an increase in volume from precipitation plus the maximum volume of wastewater resulting from a 10-year, 24-hourprecipitation event. The Facilitymustbe capable of storing the above volumes or be capable of treating the 15Permit No. UTOOOOSl maximum flow associated with these volumes. 11. The permittee takes all reasonable steps to maintaintreatment ofthe waste water such as adding lime to maintain pH in the range of6.5 to 9.0 inthe effluent and minimizes the amount ofoverflow such as not discharging leach water to the tailings pond except for storm runoff at the mine exceeding the 1 0 year 24-hour storm volume and the conditions ofPart I.D.ll.b. iii. The discharge is analyzed for the parameters listed in Part I.D.1.
IV. The discharge is reported pursuant to Part II.I.1-4 and Part II.D.
v. The storm exemption is designed to provide an affirmative defense to an enforcement action. Therefore, the permittee has the burden of demonstrating to the Executive Secretary that the above conditions have been met. b. If, as a result of precipitation or snowmelt, other areas ofthe mine operations have an overflow or discharge which does not meetthe limitations established pursuant to 40 CFR 440.131(b), as deemed applicable, the permittee may qualify for an exemption from such limitations with respect to such discharge ifthe permittee notifies the Executive Secretary ofthe event in writing within thirty days ofthe event and the following conditions are met:
1. The facility is designed, constructed, and maintained to contain the maximum volume of waste water stored by the facility during normal operating conditions (without an increase in volume from precipitation) plus the maximum volume ofwaste water resulting from a 1 0-year, 24- hour precipitation event. In computing the maximum volume of waste water which would result from a 1 0-year, 24-hour precipitation event, the permittee must include the volume which would result from all areas contributing runoffto the facility, i.e., all runoffthat is not diverted from the area, or process subject to zero discharge, and other runoff that is allowed to commingle with the influent to the treatment system.
11. Thepermittee takes all reasonable steps to minimize the overflow or excess discharge such as containment and reuse where practical. iii. There is no discharge ofleachwaterto Bingham Creek orthe JordanRiver.
IV. The permittee complies with the notification requirements ofthe permit. The storm exemption is designed to provide an affirmative defense to an enforcement action. Therefore, the operator has the burden of demonstrating to the appropriate authority that the above conditions have been met. 16Permit No. UT000051
12. Whole Effluent Toxicity (WET) Testing -Acute Toxicity. Effective immediately, and lasting through the life ofthis permit, there shall be no acute toxicity for Ceriodaphnia dubia in outfall 002 or 005 discharges, and no acute toxicity for Cryprinodon variegatus (sheepshead minnow) in outfalls 007 or 012 discharge as defined in Part lA and determined by test procedures described below. Effective immediately,the permittee will sample monthlythe calcium concentration ofthe 012 outfall. Ifthe calcium
. concentration drops below 350 mg/L, a 96-hour acute toxicity test · using Mysidopsis bahia (mysid shrimp) will be conducted to determine the appropriateness ofthis species for the 012 outfall. Starting onthe effective date ofthis permit, when the maximum individual weekly average flow for outfalls 002 and 005 is greater than 10 MGD, the permittee shall monthly, conduct acute static replacementtoxicity tests on composite samples ofthe final effluent. The samples shall be collected at outfalls 002 and 005. Sampling is only required quarterly if the quarterly average flow is less than 10 MGD and not required if the quarterly average flow has not exceeded 1 MGD. The permittee will also conduct acute static replacement toxicity tests on composite samples ofthe final effluent on a quarterly basis for outfall 012. Sampling is not required if the quarterly average flow has not exceeded 1 MGD. A yearly spring time acute biomonitoring test using Ceriodaphnia dubia is also required for outfall 010. Acute biomonitoring testing using Cryprinodon variegatus (sheepshead minnow) will be required at outfall 007 ifthe quarterly average flow has exceeded 1MGD. Sampling is not required ifthe quarterly average flow has not exceeded 1 MGD. The monitoring frequency for acute tests shall be as specified in the previous paragraph unless a sample is found to be acutely toxic during a routine test. Ifthat occurs, the monitoring frequency shall become weekly (See Part 1D.12.a, Accelerated Testing). Samples shall be collected on a two day progression; i.e., if the first sample is on a Monday, during the next sampling period, the sampling shall begin on a Wednesday, etc. Inthe event ofan acute toxicitytest failure, the Permittee shall still be in compliance with the permit, as long as the Permittee is complyingwiththe requirements ofPart 1.12 ofthis permit. The replacement static acute toxicity tests shall be conducted in general accordance with theprocedures set out inthe latestrevision of Methods forMeasuring theAcute Toxicity of Effluents andReceiving Waters to Freshwater andMarine Organisms. Fourth Edition. August 1993, EPA/600/4-90/027F as per 40 CFR 136.3(a) TABLE !A-LIST OF APPROVED BIOLOGICAL METHODS, and the Region VIII EPA NPDES Acute Test Conditions -StaticRenewal Whole Effluent Toxicity Test (August, 1997). In the case of conflicts, the RegionVIIIprocedures will prevail. The permittee shall conductthe 96-hour static replacement toxicity test for outfall 012 using Cyprinodon variegatus, and for outfalls 002, 005 and 010 48-hour tests using Ceriodaphnia dubia.

17Permit No. UT000051 Acute toxicity occurs when 50 percent or more mortality is observed for either species at any effluent concentration. Mortality inthe control must simultaneouslybe 10 percent or less for the results to be considered valid. Ifmore than 10percent control mortality occurs, thetest shall be repeateduntil satisfactory control mortality is achieved. A variance to this requirement may be granted by the Executive Secretary if a mortality of less than 10 percent was observed in higher effluent dilutions. If the permit contains a total residual chlorine limitation greater than 0.20 mg/L, the permittee may request from the Executive Secretary approval to dechlorinate the sample, or collect the sample prior to chlorination. Quarterlytestresults shall bereported alongwiththe Discharge MonitoringReport 

### (DMR.) :submitted for the end ofthe reporting quarter, e.g., biomonitoringresults for the calendar quarter ending March 31 shallbe reported withthe DMRdue April28, withtheremaining biomonitoring reports submitted with DMRs due each July 28, October 28, and January 28. Monthly test results shall be reported along with the DMR submitted for that month
. The format for the report shall be consistent with the latest revision ofthe 

### Region VIII Guidance for Acute Whole Effluent Reporting (August, 1997) and shall include all chemical and physical data as specified. Ifthe results for one year oftesting indicate no acute toxicity, the permittee may request a reduction intesting frequency and/or reduction to one species. The Executive Secretary may approve, partially approve, or deny the request based on results and other available information. Ifapproval is given, the modificationwill take place without apublicnotice.
a. 

### Accelerated Testing. When acute toxicity is indicated during routine biomonitoring as specified inthis permit, the permittee shall notify the Executive Secretary in writing within 5 days after becoming aware ofthe test result. The permittee shall perform an accelerated schedule of biomonitoring to establish whether a pattern oftoxicity exists. Accelerated testing will begin within seven days afterthe permittee becomes aware ofthe testresult. Acceleratedtesting shall be conducted as specified under 

### Part ID.12.b, Pattern ofToxicity. If the acceleratedtesting demonstrates no pattern oftoxicity, routine monitoring shall be resumed. b. 

### Pattern ofToxicity. A pattern oftoxicity is defined by the results ofa series ofup to five biomonitoring tests pursuantto the accelerated testing requirements using 100 percent effluent on the species being tested, once every week for up to five consecutive weeks. Iftwo (2) consecutive tests (not including the scheduled quarterly or monthly test which triggered the search for a pattern oftoxicity) do not result in acute toxicity, no further accelerated testing will be required and no pattern oftoxicity will be found to exist. The permittee will provide written verification to the Executive Secretary within 5 days, and resume routine monitoring. 18Permit No. UT000051
A pattern oftoxicity is established ifone ofthe following occurs:
1. Iftwo (2) consecutivetestresults (notincludingthe scheduled quarterlyor monthly test which triggered the search for a pattern oftoxicity) indicate acute toxicity, this constitutes an established pattern oftoxicity. ii. If consecutive tests continue to yield differing results each time, the permittee will be required to conduct up to a maximum offive (5) acute tests (not includingthe scheduled quarterly ormonthlytest whichtriggered the search for a pattern oftoxicity). Ifthree out offive testresults indicate acute toxicity, this will constitute an established pattern oftoxicity.

c. Preliminary Toxicity Investigation
1. When a pattern of toxicity is detected the permittee will notify the Executive Secretaryinwriting within 5 days andbeginanevaluationof the possible causes ofthe toxicity. The permittee will have 15 working days from demonstration ofthe pattern oftoxicity to complete a Preliminary ToxicityInvestigation (PTI) and submit

## awrittenreport oftheresults to the Executive Secretary. ThePTImayinclude, butis notlimitedto, additional chemical and biologicalmonitoring, examination ofpretreatmentprogram records, examination ofdischargemonitoringreports, athoroughreview of the testing protocol, evaluation oftreatment processes and chemical use, inspection ofmaterial storage andtransfer areas to determine ifa spill may have occurred, and similar procedures.

11. If the PTI identifies a probable toxicant and/or a probable source of toxicity, the permittee shall submit, as part of its final results, written notification ofthat effect to the Executive Secretary. Withinthirtydays of completing the PTI the permittee shall submit for approval a control program to control effluent toxicity and shall proceed to implement such plan within seven days following approval. The control program, as submitted to or revised by the Executive Secretary, may be incorporated into the permit.

111. Ifnoprobable explanationfor toxicityis identified inthePTI, the permittee shall notify the Executive Secretary as part ofits final report, along _with a schedule for conducting a Phase I Toxicity Reduction Evaluation (TRE) (See Part1D.12.d, Toxicity Reduction Evaluation).
IV. If toxicity spontaneously disappears during the PTI, the permittee shall submit written notification to that effect to the Executive Secretary as part ofthe reporting requirements ofparagraph i ofthis section.

19Permit No. UT000051 d. Toxicity Reduction Evaluation (TRE). Iftoxicity is detected during the life ofthis permit and itis determined bythe Executive Secretarythat a TRE is necessary, the permittee shall be so notified and shall initiate a TRE immediatelythereafter. The purpose of the TRE will be to establish the cause of the toxicity, locate the source(s) ofthe toxicity, and control or provide treatment for the toxicity. A TRE may include but is not limited to one, all, or a combination of the following: Phase I- Toxicity Characterization Phase II- Toxicity Identification Procedures Phase III- Toxicity Control Procedures Any other appropriate procedures for toxicity source elimination and control If the TRE establishes that the toxicity cannot be immediately eliminated the permittee shall submit a proposed complianceplanto the Executive Secretary. The plan shall include the proposed approach to control toxicity and a proposed compliance schedule for achieving·control. If the approach and schedule are acceptable to the Executive Secretary, this permitmay be reopened and modified. If

the TRE shows thatthe toxicity is causedby a toxicant(s) thatmaybe controlled with specific numerical limitations, the permittee may: 1. Submit an alternative control program for compliance with the numerical requirements. n. If necessary, provide a modified biomonitoring protocol which compensates for the pollutant(s) being controlled numerically. Ifacceptable to the Executive Secretary, thispermitmaybereopened and modified to incorporate any additional numerical limitations, a modified compliance schedule ifjudged necessary by the Executive Secretary, and/or a modified biomonitoring protocol. Failure to conduct an adequate TRE, or failure to submit a plan or program as described above, or the submittal ofa plan or programjudged inadequate by the Executive Secretary, shall be considered a violation ofthis permit.
e. Prohibition ofNon-Storm WaterDischarges!. Except for process waterdischarges identified inthe permit, the Statement ofBasis and the discharges identified later inthis paragraph, additional discharges from this facility are limitedto storm water only. The following non-storm discharges may be authorized by this permitto be discharged with storm water discharges providedthe non-storm water component ofthe discharge is in compliance withpart IE.5.h (Measures and Controls for Non-storm Water Discharges): discharges from fire fighting activities; fire hydrant flushings; potable water sources including waterline flushings; irrigation drainage; lawn watering; routine external building wash down which does notuse detergents 20Permit No. UTOOOOSl
or other compounds; pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (unless all spilled material has been removed) and where detergents are notused; air conditioning condensate; springs; uncontaminated ground water; and foundations or footing drains where flows are not contaminated with process materials such as solvents. E. Storm Water Pollution PreventionPlan. Ithasbeen determinedthatthepermitteehas a regulated storm water discharge as per 

### UA CR317. 8. Therefore, the permittee shall develop a storm water pollution prevention plan. However, ifthe permittee has provided storm runoffcontainment for the 25 year, 24 hour storm for new facilities or containment for the 10 year, 24 hour storm for existing facilities, the storm water pollution prevention plan may be modified for that portion of the facility. The plan shall be prepared and retained according to the following conditions. 1. Deadlines for Plan Preparation and Compliance. The storm water pollution prevention plan from the previous permit, as required under PartIE., will remain in effect until the current plan is modified and implemented. The newplan shall be implemented within 90 days of issuance of this permit unless the Executive Secretary gives written approval extending the implementation time for parts ofthe plan. 2. Signature and Plan Review.
a. The plan shall be signed in accordance withPartIVG. (Signatory Requirements), and be retained on site at the facility which generates the storm water discharge. b. Thepermittee shall make plans available uponrequestto the Executive Secretary, or authorized representative.
c. Required modifications. The Executive Secretary may notify the permittee at any time that the plan does not meet one or more ofthe minimum requirements ofthis part. Such notification shall identify those provisions ofthe permit that are not being met by the plan and identify which provisions of the plan require

**modification~** in order to meet the minimum requirements ofthis part. Within 30 daysofsuchnotification from the Executive Secretarythe permittee shall make the required changes to the plan and shall submit to the Executive Secretary a written certification that the requested changes have been made. 3. Pollution Prevention Team. Each plan shall identify a specific individual or individuals within the facility organization as members ofa storm water Pollution Prevention Team that are responsible for developing the storm waterpollutionpreventionplan and assisting the facility or plant manager in its implementation, maintenance, and revision. The plan shall clearly identify the responsibilities of each team member. The activities and responsibilities ofthe team shall address all aspects ofthe facility's storm waterpollution prevention plan. 4. Description of Potential Pollutant Sources. Each plan shall provide a description of 21Permit No. UT000051 potential sources which may reasonably be expected to add significant amounts of pollutants to storm water discharges or which may result in the discharge ofpollutants during dry weather from separate storm sewers draining the facility. Each plan shall identify all activities and significant materials which may potentially be significant pollutant sources. Each plan shall include, at a minimum:
a. Drainage.
1. A site map indicating, an outline ofthe portions ofthe drainage area of each storm water outfall that are within the facility boundaries, each existing structural control measure to reduce pollutants in storm water runoff, surface water bodies, locations where significant materials are exposed to precipitation, locations where major spills or leaks have occurred, andthe locations ofthefollowing activities where such activities are exposed to precipitation: fueling stations, vehicle and equipment maintenance and/or cleaning areas, loading/unloading areas, locations used for the treatment, storage or disposal of wastes, liquid storage tanks, processing areas and storage areas.
n. For each area of the facility that generates storm water discharges associated with industrial activitywith areasonablepotential for containing significant amounts ofpollutants the permittee shall make a prediction of the direction offlow, and an identification ofthe types ofpollutants which are likelyto be presentin stormwater discharges associated with industrial activity. Factors to consider include the toxicity ofchemicals; quantity of chemicals used, produced ordischarged; the potential ofcontact with storm water; and history of significant leaks or spills of toxic or hazardous pollutants. Flows with a significantpotential for causing erosion shall be identified. b. Inventory ofExposed Materials. An inventory ofthe types ofmaterials handled at the sitethatpotentiallymaybe exposed to precipitation and discharged to surface or groundwater. Such inventory shall include a narrative description of significant materials that have been handled, treated, stored or disposed in a manner to allow exposure to storm water between the time ofthree years prior to the date ofthe issuance ofthis permit and the present; method and location ofon-site storage or disposal; materials management practices employed to minimize contact of materials with storm water runoffbetween the time ofthree years prior to the date ofthe issuance ofthis permit and the present; the location and a description of existing structural and non-structural control measures toreduce pollutants in storm water runoff; and a description of any treatment the storm water receives. This description should also include areas with the potential for deposition activities. The description shall be updated whenever there is a significant change inthe type or quantity of exposed materials or material management practices, which may affect the exposure ofmaterialsto storm water. Those updates will include any new 22Permit No. UT000051 exposures related to waste rock or overburden management.
c. Spills and Leaks. A list of significant spills and significant leaks of toxic or hazardous pollutantsthat occurred at areas that are exposed to precipitation or that otherwise drain to a storm water conveyance at the facility after the date ofthree years prior to the effective date of this permit. Such list shall be updated as appropriate during the term ofthe permit. d. Sampling Data. A summary of existing discharge sampling data describing pollutants in storm water discharges from the facility, including a summary of sampling data collected during the term ofthis permit.

e. Risk Identification and Summary of Potential Pollutant Sources. A narrative description ofthe potentialpollutant sources from the following activities: loading and unloading operations; outdoor storage activities; outdoor manufacturing or processing activities; significant dust orparticulate generating processes; and onsite waste disposal practices. The description shall specifically list any significant potential source ofpollutants atthe site and for eachpotential source, anypollutant orpollutantparameter (e.g
.biochemical oxygendemand, etc.) ofconcerns shall be identified. 5. Measures and Controls. Eachfacility coveredby this permit shall develop a description of stormwatermanagementcontrols appropriate forthe facility andimplement suchcontrols. The appropriateness and priorities ofcontrols in a plan shall reflect identified potential sources ofpollutants atthe facility. The description ofstorm water management controls shall address the following minimumcomponents, including a schedule for implementing such controls:
a. Goodhousekeeping. Goodhousekeepingrequires the maintenance ofareas which may contributepollutantsto storm water discharges in a clean, orderlymanner. The pollution prevention plan should consider implementation of the following measures where applicable:
1. Establish a cleaning ormaintenance programfor all impervious areas ofthe facility where particulate matter, dust, or debris may accumulate, particularly areas of material loading/unloading, material storage and handling, and processing.
n. Paved areas ofvehicle traffic ormaterial storage where vegetative or other stabilization methods are not practical. Institute sweeping programs in these areas as well. iii. Forunstabilized areas ofthe facility where sweeping is notpractical, storm watermanagement devices such as sedimenttraps, vegetative buffer strips, filter fabric fence, sediment filtering boom, gravel outletprotection orother 23Permit No. UT000051 equivalent measures, that effectively trap or remove sediment should be considered. b. Source Controls. The permittee shall consider preventive measures to minimize the potential exposure ofall significant materials (as described inPartI.E.4 ofthis section) to precipitation and storm waterrunoff. Thepermittee should considerin a narrative description the implementation ofthe following measures to reduce the exposure ofall materials to storm water:
1. Relocate all materials, including raw materials, intermediate products, material handling equipment, obsolete equipment, and wastes currently stored outside to inside locations. · n. Establishment ofa schedule for removal ofwastes and obsolete equipment to minimize the volume of these materials stored onsite that may be exposed to storm water. iii. Substitution of less hazardous materials, or materials less likely to contaminate storm water, or substitution of recyclable materials for nomecyclables whenever possible. tv. Constructing permanentor semipermanentcovers, or other similar forms of protection over stockpiled materials, material handing and processing equipment. Options include roofs, tarps, and covers. This may also include the use of containment bins or covered dumpsters for raw materials, waste materials and nomecyclables waste materials.
v. Dikes, berms, curbs, trenches, or other equivalentmeasures to divertrun on from material storage, processing, or waste disposal areas.
c. Preventive Maintenance. A preventive maintenance program shall involve inspection and.maintenance of storm water management devices (e.g. cleaning oil/water separators, catch basins) as well as inspecting and testing facility equipment and systems to uncover conditions that could cause breakdowns or failures resulting in discharges of pollutants to surface waters, and ensuring appropriate maintenance ofsuch equipment and systems. d. Spill Prevention and Response Procedures. Areas where potential spills which can contribute pollutants to storm water discharges can occur, and their accompanying drainage points shall be identified clearly in the storm water pollution prevention plan. Where appropriate, specifying material handling procedures, storage requirements, and use ofequipment such as diversion valves in the plan should be considered. Procedures for cleaning up spills shall be identified in the plan and made available to the appropriate personnel. The necessary equipment to implement a clean up should be available to personnel. 24Permit No. UT000051

e. Inspections. In addition to or as part ofthe comprehensive site evaluationrequired under this permit, qualified facility personnel shall be identified to inspect designated equipment and areas ofthe facility at appropriate intervals specified in the plan. A set oftracking or follow up procedures shall be used to ensure that appropriate actions are taken inresponse to the inspections. Records ofinspections shall be maintained. f. Employee Training. Employee training programs shall inform personnel responsible for implementing activities identified in the storm water pollution prevention plan or otherwise responsible for storm water management at all levels of responsibility of the components and goals of the storm water pollution prevention plan. Training should address topics such as spill response, good housekeeping and material management practices. A pollution prevention plan shall identifyperiodic dates for such training. In all cases training must be held at least annually. g. Recordkeeping and Internal Reporting Procedures. A description of incidents such as spills, or other discharges, along with other information describing the quality and quantity ofstorm water discharges shall be includedinthe planrequired under this part. Inspections and maintenance activities shall be documented and records ofsuch activities shall be incorporated into the plan. h. Non-Storm Discharges.
1. The permittee's current certification will be accepted and considered complete. However, the plan shall include a certification that any new discharges have been tested or evaluated for the presence ofnon-storm water discharges. The certification shall include the identification of potential significant sources ofnon-storm water atthe site, a description of the results ofany test and/or evaluationfor the presence ofnon-stormwater discharges, the evaluation criteria or testing method used, the date ofany testing and/or evaluation, andthe on-site drainagepoints thatwere directly observed during the test. The certification must be signed in accordance with signatory requirements in PartIV.G Signatory Requirements ofthis permit. A dischargerthatis unable to provide certificationrequiredbythis paragraph must notify the Executive Secretary.

u. Except for flows from fire fighting activities, sources ofnon-storm water that are combined with storm water discharges associated with industrial activity must be identified inthe plan. The plan shall identify and ensure the implementation ofappropriate pollution prevention measures for the non-storm water component(s) ofthe discharge. iii. Failure to Certify. Ifthe permittee is unable to provide the certification 25Permit No. UT000051 required for new discharges (testing for non-storm water discharges), the facility mustnotifythe Executive Secretary within 30 days ofconstruction ofthe new discharge. Ifthe failure to certify is caused by the inability to perform adequate tests or evaluations, suchnotification shall describe: The procedure of any test conducted for the presence on non-storm water discharges; the results ofsuchtests orotherrelevant observations; potential sources of non-storm water discharges to the storm sewer; and why adequate test from such storm sewers were not feasible. Non-storm water discharges to waters of the United States that are not authorized by an NPDES permit are unlawful and must be terminated.
1. Sediment and Erosion Control. The plan shall identify areas which, due to topography, activities, or other factors, have a high potential for significant soil erosion, and identify structural, vegetative, and/or stabilization measures to limit erosion. Theplan shall also contain a narrative consideration ofthe appropriateness oftraditional storm water management practices (practices other than those that control the generation or sources ofpollutants) used to divert, infiltrate, reuse, or otherwise mange storm water runoffin a manner that reduces pollutants in storm water discharges from the site. The plan shall provide that measures that the permittee determines to be reasonable and appropriate shall be implemented and maintained. The potential ofvarious sources atthe facility to contribute pollutants to storm water discharges associated with industrial activity (see paragraph Part I.E.4 ofthis section (Description ofPotential Pollutant Sources) shallbe considered when determiningreasonable and appropriate measures. Appropriate measures may include; vegetative swales and practices, reuse of collected water (such as for a process or irrigation source), inlet controls ( such as oil/water separators), snow management activities, infiltration deicers, and wet detention/retention devices. J. Management ofRunoff. Facilities shall consider implementation ofthe following storm water management practices to address pollutants ofconcern:
1. Vegetative buffer strips, filter fabric fence, sediment filtering boom, or other equivalent measures, that effectivelytrap orremove sedimentpriorto discharge through an inlet or catch basin.
n. Media filtration such as catch basin filters and sand filters. iii. Oil/water separators or the equivalent 1v. Structural BMPs such as settling basins, sediment traps, retention or detention ponds, recycling ponds or other equivalent measures. Appropriate measures may include: vegetative swales and practice, reuse of collected storm water (such as for a process or as an irrigation source), inlet controls (such as oil/water separators), snowmanagement activities, infiltration 26Permit No. UT000051 deicers and wet detention/retention devices. 6. Comprehensive Site Compliance Evaluation. Qualified personnel shall conduct site compliance evaluations at appropriate intervals specified in the plan, but, in no case less than once a year. Such evaluations shall provide:

a. Areas contributing to a storm water discharge associated with industrial activity shall be visually inspected for evidence of, or the potential for, pollutants entering the drainage system. Measures to reduce pollutant loadings shall be evaluated to determine whetherthey are adequate and properlyimplementedin accordance with the terms of the permit or whether additional control measures are needed. Structural storm water management measures, sediment and erosion control measures, and other structural pollutionprevention measures identified intheplan shall be observedto ensure thatthey are operating correctly. A visual inspectionof equipmentneededto implementthe plan, such as spill response equipment, shallbe made. b. Basedonthe results ofthe inspection, the description ofpotential pollutant sources identified in the plan and pollution prevention measures and controls identified in the plan shall be revised as appropriate within two weeks of such inspection and shall provide for implementation ofany changes to the planin a timely manner, but inno case more than twelve weeks after the inspection. A longer time period may be approved by the Executive Secretary whenjustified by the permittee.

c. A report summarizing the scope ofthe inspection, personnel making the inspection, the date(s) ofthe inspection, major observations relating to the implementation of the storm water pollution prevention plan, and actions taken shall be made and retained as part ofthe storm water pollution prevention plan for at least one year after coverage underthis permitterminates. The report shall identify any incidents of non-compliance. Where a report does not identify any incidents of noncompliance, the report shall contain a certificationthatthe facility is incompliance withthe stormwaterpollutionpreventionplan andthis permit. The report shall be signed in accordance with PartIV.G Signatory Requirements ofthis permit. Where significant settling or depositionfrom process emissions are observed during properoperation ofexisting equipment, the permittee shall considerways to reduce these emissions including but not limited to: Upgrading or replacing existing equipment; collectionrunofffrom areas ofdeposition for treatment orrecycling; or changes in materials or processes to reduce the generation ofparticulate matter. d. Where compliance evaluation schedules overlap with inspections required under Part I.E.S.e, the compliance evaluation may be conducted 

### in place of one such inspection. 7. Consistency with other plans. Storm water pollution prevention plans may reflect 27Permit No. UT000051 requirements for SpillPrevention Control andCountermeasure

**("SPCC'~** plans developed for the facility under Section 311 ofthe CWA or Best Management Practices

**("BMP'~** otherwise required by this permit for the facility as long as such requirement is incorporated into the storm water pollution prevention plan. 8. Additional Requirements for Salt Storage. Storage piles ofsalt used for deicing or other commercial or industrial purposes and which generate a storm water discharge associated with industrial activity which is discharged to waters ofthe State shall be enclosed or coveredto prevent exposure to precipitation, except for exposure resulting from adding or removing materials from the pile. 9. Monitoring Requirements: During the period beginning onthe effective date and lasting through the expiration date ofthis permit storm events greater than 0.1 inches and more than 72 hours after the previous measurable storm at sites SW3 and SW4 shall be monitored at least 2 times per year and sampled if discharge is present, for the same appropriate parameters as listed for the tailings impoundment outfall 012 in Part I.D.8. except for cyanide and biomonitoring. Where practical, samples must consist ofa grab sample inthe fust 30 minutes ofthe observed discharge for pH, total metals and ifa sheen is present oil & grease. Inadditionto the parameters listed, the permittee shallprovidethe date and duration (in hours) ofthe storm events(s) sampled; rainfall measurements or estimates ( in inches) ofthe storm eventwhich generatedthe sampledrunoff; the duration betweenthe storm event sampled andthe end ofthe previous measurable (greaterthan0.1 inchrainfall) storm event; and an estimate ofthe total volume (in gallons) ofthe discharge sampled. Monitoring is not required after reclamation bond release or reclamation has reduced values to background levels. 10. Sampling Waiver. Whenunable to collect samples due to adverse climatic conditions,the dischargermust submitinlieu ofsampling data a description ofwhy samples could notbe collected, including available documentation ofthe event. Adverse weather conditions which may prohibit the collections samples includes weather conditions that create dangerous conditions for personnel (such as local flooding, high winds, electrical storms, etc.) or otherwise make the collection ofa sample impractical (drought, extended frozen conditions, etc). 11. Reporting. Monitoring results shall be reported with the monthly Discharge Monitoring Report within 60 days ofsampling. 12. EPCRA Section 313 Requirements. In areas where Section 313 waterpriority chemicals are stored, processed or otherwise handled, appropriate containment, drainage control and/or diversionary structures shall be provided. At a minimum, one ofthe following preventive systems or its equivalent shall be used:
a. Curbing, culverting, gutters, sewers, or otherforms ofdrainage control to prevent or minimize the potential for storm waterrun-on to come into contactwith significant sources ofpollutants; or 28Permit No. UT000051
b. Roofs, covers or other forms ofappropriate protectionto prevent storage piles from exposure to storm water and wind.
c. No 

### tank or container shall be used for the storage ofa Section 313 water priority chemical unless its material and construction are compatible with the material stored and conditions ofstorage such as pressure and temperature, etc. d. Liquid storage areas for Section 313 water priority chemicals shall be operated to minimize discharges ofSection 313 chemicals. Appropriate measures to minimize discharges ofSection 313 chemicals mayinclude secondary containment provided for at least the entire contents ofthe largest single tankplus sufficient freeboard to allow for precipitation, a strong spill contingency and integritytestingplan, and/or other equivalent measures. Material storage areas for Section 313 water priority chemicals other than liquids that are subject to runoff, leaching, or wind shall incorporate drainage or other control features that will minimize the discharge of Section 313 water priority chemicals by reducing storm water contact with Section 313 water priority chemicals.
e. Truck and rail car loading andunloading areas for liquid Section 313 waterpriority chemicals shall be operated to minimize discharges ofSection 313 water priority chemicals. Protection such as overhangs or door skirts to enclose trailer ends at truck loading/unloading docks shall be provided as appropriate. Appropriate measures to minimize discharges of Section 313 chemicals may include: the placement and maintenance ofdrip pans (including theproper disposal of materials collected in the drip pans) where spillage may occur (such as hose connections, hose reels and filler nozzles) for use whenmaking and breaking hose connections; a strong spill contingency and integrity testing plan; and/or other equivalent measures. f. Processing equipment and materials handling equipment shall be operated so as to minimize discharges of Section 313 water priority chemicals. Materials used in piping and equipment shall be compatible with the substances handled. Drainage from process and materials handling areas shall minimize storm water contactwith Section 313 water priority chemicals. Additional protection such as covers or guards to prevent exposure to wind, spraying or releases from pressure reliefvents from causing a discharge ofSection 313 water priority chemicals to the drainage system shall be provided as appropriate. Visual inspections or leak tests shall be provided for overhead piping conveying Section 313 water priority chemicals without secondary containment. g. Drainage from areas covered by paragraphs 

### a., b., 

### c., or 

### d (above) should be restrained by valves or other positive means to prevent the discharge ofa spill or 29Permit No. UT000051 other excessive leakage of Section 313 water priority chemicals. Where containment units are employed, suchunits may be emptied by pumps or ejectors; however, these shall be manually activated. Flapper-type drainvalves shall notbe used to drain containmentareas. Valves used for the drainage ofcontainment areas should, as far as is practical, be ofmanual, open-and-closed design. Iffacility drainage is not engineered as above, the final discharge ofall in-facility storm sewers shall be equippedto be equivalentwith a diversion systemthat could, inthe event ofanuncontrolled spill ofSection 313 waterpriority chemicals, return the spilled material to the facility. Records shall be kept of the frequency and estimated volume (in gallons) of discharges from containment areas. h. Other areas ofthe facility (those not addressed in paragraphs 

### a., b., c., or d.), from which runoff that may contain Section 313 water priority chemicals or spills of Section 313 waterpriority chemicals could cause a discharge shall incorporate the necessary drainage or other control features to prevent discharge of spilled or improperly disposed material and ensure the mitigation ofpollutants in runoffor leachate.
1. All areas ofthe facility shall be inspected at specific intervals identified in the plan for leaks or conditions that could lead to discharges of Section 313 water priority chemicals or direct contact of storm water with raw materials, intermediate materials, waste materials orproducts. Inparticular, facility piping, pumps, storage tanks and bins, pressure vessels, process and material handling equipment, and material bulk storage areas shall be examined for any conditions or failures that could cause a discharge. Inspection shall include examination for leaks, wind blowing, corrosion, support orfoundation failure, or other forms ofdeterioration or noncontainment. Inspection intervals shall be specified in the plan and shall be based on design and operational experience. Different areas may require different inspection intervals. Where a leak or other condition is discovered that may result in significantreleases ofSection 313 waterprioritychemicalsto waters ofthe State, action to stop the leak or otherwise prevent the significant release of Section 313 water priority chemicals to waters ofthe State shall be immediately taken or the unit or process shut down until such action can be taken. When a leak or noncontainment of a Section 313 water priority chemical has occurred, contaminated soil, debris, orothermaterial mustbe promptlyremoved and disposed in accordance with Federal, State, and local requirements and as described in the plan. 

### J. Facilities shall have the necessary security systems to prevent accidental or intentional entry that could cause a discharge. Security systems described in the 30Permit No. UT000051 plan shall address fencing, lighting, vehicular traffic control, and securing of equipment and buildings. 

### k. Facility employees and contractor personnel that workin areas where Section 313 water priority chemicals are used or stored shall be trained in and informed of preventive measures at the facility. Employee training shall be conducted at intervals specified in the plan, but not less than once per year. Training shall address: pollution control laws and regulations, the storm water pollution prevention plan and the particular features ofthe facility and its operation that are designedto minimize discharges ofSection 313 water prioritychemicals. The plan shall designate a person who is accountable for spill prevention at the facility and who will set up the necessary spill emergency procedures and reporting requirements so that spills and emergency releases of Section 313 water priority chemicals can be isolated and containedbefore a discharge ofa Section 313 water priority chemical can occur. Contractor ortemporary personnel shall be informed offacility operation and design features inorderto prevent discharges orspills from occurnng.

31Permit No. UT0000051 II. MONITORING, RECORDING AND REPORTING REQUIREMENTS. A. Representative Sampling. Samples taken in compliance with the monitoring requirements established under PartI shall be collected from the effluent stream prior to discharge into the receiving waters. Samples and measurements shall be representative ofthe volume and nature ofthe monitored discharge. Sludge samples shall be collected at a location representative of the quality of sludge immediately prior to the use-disposal practice. B. Monitoring Procedures. Monitoring must be conducted according to test procedures approved under Utah Administrative Code ("UAC'') R317-2-10, unless other test procedures have been specified in this permit. C. Penalties for Tampering. TheActprovides that any person who falsifies, tatnper:s with, ur knowingly renders inaccurate, any monitoring device or method required to be maintained under this permit shall, upon conviction, be punished by a fine ofnot more than $10,000 per violation, or by imprisonment for not more than six months per violation, or by both. D. Reporting ofMonitoring Results. Monitoring results obtained during the previous month shall be summarized for each month and reported on a Discharge Monitoring Report Form (EPA No. 3320-1), post-marked no later than the 28th day ofthe month following the completed reporting period. The first report is due onNovember 28, 2006. Ifno discharge occurs during the reporting period, "no discharge" shall be reported. Legible.copies ofthese, and all other reports including whole effluent toxicity (WET) test reports required herein, shall be signed and certified in accordance with the requirements ofSignatory Requirements (see Part IV. G), and submitted to the Director, Division ofWater Quality and to EPA at the following addresses: original to: Department ofEnvironmental Quality Division ofWater Quality 288 North 1460 West PO Box 144870 Salt Lake City, Utah 84114-4870 copy to: Technical Enforcement Program (8ENF-T) Office ofEnforcement, Compliance Assistance & Environmental Justice US EPA Region VIII 999 18th Street, Suite 500 Denver, CO 80202-2466 E. Compliance Schedules. Reports ofcompliance or noncompliance with, or any progress reports on, interim and final requirements contained in any Compliance Schedule ofthis permit shall be submitted no later than 14 days following each schedule date. F. Additional Monitoring by the Permittee. Ifthe permittee monitors any parameter more frequently than required by this permit, using test procedures approved under UAC R317-2-10 32Permit No. UT0000051
or as otherwise specified in this permit, the results ofthis monitoring shall be included in the calculation and reporting ofthe data submitted in the DMR. Such increased frequency shall also be indicated. Only those parameters required by the permit need to be reported. G. Records Contents. Records ofmonitoring information shall include: 1. The date, exact place, and time ofsampling ormeasurements: 2. The individual(s) who performed the sampling or measurements; 3. The date(s) and time(s) analyses were performed; 4. The individual(s) who performed the analyses; 5. The analytical techniques or methods used; and, 

### 6. The results ofsuch analyses. H. Retention ofRecords. The permittee shall retain records ofall monitoring information, including all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation, copies ofall reports required by this permit, and records ofall data used to complete the application for this permit, for a period ofat least three years from the date ofthe sample, measurement, report or application. This period may be extended by request ofthe Executive Secretary at any time. A copy ofthis UPDES permit must be maintained on site during the duration ofactivity at the permitted location. I. Twenty-four Hour Notice ofNoncompliance Reporting. 1. The permittee shall (orally) report any noncompliance which may seriously endanger health or environment as soon as possible, but no later than twenty-four (24) hours from the time the permittee first became aware ofcircumstances. The report shall be made to the Division ofWater Quality, (801) 538-6146, or 24

**~our** answering service (801) 536-4123. 2. The following occurrences ofnoncompliance shall be reported by telephone (801) 536- 4123 as soon as possible but no later than 24 hours from the time the permittee becomes aware ofthe circumstances:

a. Any noncompliance which may endanger health or the environment; b. Any unanticipated bypass which exceeds any effluent limitation in the permit

.(See Part III

### G, Bypass of Treatment Facilities.);

c. Any upset which exceeds any effluent limitation in the permit (See PartIIIH, Upset Conditions.); or, d. Violation ofa maximum daily discharge limitation for any ofthe pollutants listed in the permit. 3. A written submission shall also be provided within five days ofthe time that the 33Permit No. UT0000051 permittee becomes aware ofthe circumstances. The written submission shall contain:
a. A description ofthe noncompliance and its cause; b. The period ofnoncompliance, including exact dates and times;
c. The estimated time noncompliance is expected to continue ifit has not been corrected; and, d. Steps taken or planned to reduce, eliminate, and prevent reoccurrence ofthe noncompliance.

t:. Steps taken, ifany, tu mitigate the adverse impacts on the environment and human health during the noncompliance period. 4. The Executive Secretary may waive the writtenreport on a case-by-case basis ifthe oral report has been received within 24 hours by the Division ofWater Quality, (801) 538-6146. 5. Reports shall be submitted to the addresses inPart liD, Reporting of Monitoring Results. J. Other Noncompliance Reporting. Instances ofnoncompliance not required to be reported within 24 hours shall be reported at the time that monitoring reports for Part liD are submitted. The reports shall contain the information listed in Part III3. K. Inspection and Entry. The permittee shall allow the Executive Secretary, or an authorized representative, upon the presentation ofcredentials and other documents as may be required by law, to: 1. Enter upon the permittee's premises where a regulated facility or activity is located or conducted, or where records must be kept under the conditions ofthe permit; 2. Have access to and copy, at reasonable times, any records that mustbe kept under the conditions ofthis permit; 3. Inspect at reasonable times any facilities, equipment (including monitoring and control equipment), practices, or operations regulated or required under this permit; and, 4. Sample or monitor at reasonable times, for the purpose ofassuring permit compliance or as otherwise authorized by the

### Act, any substances or parameters at any location.

34Permit No. UT0000051
III. COMPLIANCE RESPONSIBILITIES A. Duty to Comply. The permittee must comply with all conditions ofthis permit. Any permit noncompliance constitutes a violation ofthe Act and is grounds fqr enforcement action; for permit termination, revocation and reissuance, or modification; or for denial ofa permit renewal application. The permittee shall give advance notice to the Executive Secretary of any planned changes inthe permitted facility or activity which may result in noncompliance with permit requirements. B. Penalties for Violations ofPermit Conditions. TheActprovides that any person who violates a permit condition implementing provisions oftheActis subject to a civil penalty not to exceed $10,000 per day ofsuch violation. Any person who willfully or negligently violates permit conditions ofthe Act is subject to a fine not exceeding $25,000 per day of violation; Any person convicted under UCA 19-5-115(2) a second time shall be punished by a fme not exceeding $50,000 per day. Except as provided at Part !JIG, Bypass of Treatment Facilities and PartIIIH, Upset Conditions, and possibly PartID.11, Storm Exemptions nothing in this permit shall be construed to relieve the permittee ofthe civil or criminal penalties for noncompliance. C. Need to Halt or Reduce Activity not a Defense. It shall not be a defense for a permittee in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions ofthis permit. D. Duty to Mitigate. The permittee shall take all reasonable steps to minimize or prevent any discharge in violation ofthis permit which has a reasonable likelihood ofadversely affecting human health or the environment. E. Proper Operation and Maintenance. The permittee shall at all times properly operate and maintain all facilities and systems oftreatment and control (and related appurtenances) which are installed or used by the permittee to achieve compliance with the conditions of this permit. Proper operation and maintenance also includes adequate laboratory controls and quality assurance procedures. This provision requires the operation ofback-up or auxiliary facilities or similar systems which are installed by a permittee only when the operation is necessary to achieve compliance with the conditions ofthe permit. F. Removed Substances. Collected screening, grit, solids, sludges, or other pollutants removed in the course oftreatment shall be buried or disposed ofin such a manner so as to prevent any pollutant from entering any waters ofthe state or creating a health hazard. Sludge/digester supernatant and filter backwash shall not directly enter either the final effluent or waters ofthe state by any other direct route. G. Bypass ofTreatment Facilities. 1. Bypass not exceeding limitations. The permittee may allow any bypass to occur 35; .. 0
Permit No. UT0000051
which does not cause effluent limitations to be exceeded, but only ifit also is for essential maintenance to assure efficient operation. These bypasses are not subject to the provisions ofparagraphs 2 and 3 ofthis section. Return ofremoved substances, as described in

### Part liiF, to the discharge stream shall not be considered a bypass under the provisions ofthis paragraph. 2. 

### Notice:
a. Anticipated bypass. Ifthe permittee knows in advance ofthe need for a bypass, it shall submit prior notice, ifpossible at least ten (10) days before the date ofthe bypass. b. Unanticipated bypass. The permittee shall submit notice ofan unanticipated bypass as required under

### PartIII, Twenty-four Hour Reporting. 3. 

### Prohibition ofbypass.
a. Bypass is prohibited and the Executive Secretary may take enforcement action against a permittee for a bypass, unless:
1. The bypass was unavoidable to prevent loss oflife, personal injury, or severe property damage ;
n. There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention ofuntreated wastes, or maintenance during normal periods ofequipment downtime. This condition is not satisfied ifadequate back-up equipment should have been installed in the exercise ofreasonable engineeringjudgment to prevent a bypass which occurred during normal periods ofequipment downtime or preventive maintenance; and, iii. The permittee submitted notices as required under paragraph 2 ofthis section. b. The Executive Secretary may approve an anticipated bypass, after considering its adverse effects, ifthe Executive Secretary determines that it will meet the three conditions listed above in paragraph 3.a ofthis section. H
. Upset Conditions
. 1. 

### Effect of an upset. An upset constitutes an affirmative defense to an action brought for noncompliance with technology based permit effluent limitations ifthe requirements of paragraph 2. ofthis section are met. The Executive Secretary's administrative determination regarding a claim ofupset cannot bejudiciously challenged by the 36Permit No. UT0000051 permittee until such time as an action is initiated for noncompliance. 2. Conditions necessary for a demonstration of upset. A permittee who wishes to establish the affirmative defense ofupset shall demonstrate, through properly signed, contemporaneous operating logs, or other relevant evidence that:

a. An upset occurred and that the permittee can identify the cause(s) ofthe upset; b. The permitted facility was at the time being properly operated;

c. The permittee submitted notice ofthe upset as required under Part III, Twentyfour Hour Notice of Noncompliance Reporting; and, d. The permittee complied with any remedial measures required under PartIIID, Duty to Mitigate. 3. Burden of proof. In any enforcement proceeding, the permittee seeking to establish the occurrence ofan upset has the burden ofproof.
I. Toxic Pollutants: The permittee shall comply with effluent standards or prohibitions established under Section 307(a) ofThe Water QualityAct of 1987 for toxic pollutants within the time provided inthe regulations that establish those standards or prohibitions, even ifthe permit has not yet been modified to incorporate the requirement. J. Changes in Discharge ofToxic Substances. Notification shall be provided to the Executive Secretary as soon as the permittee knows of, or has reason to believe: 1. That any activity has occurred orwill occur which would result inthe discharge, on a routine or frequent basis, ofany toxic pollutant which is not limited in the permit, if that discharge will exceed the highest ofthe following "notification levels":

a. One hundred micrograms per liter (100 ug/L); b. Two hundred micrograms per liter (200 ug/L) for acrolein and acrylonitrile; five hundred micrograms per liter (500 ug/L) for 2,4-dinitrophenol and for 2-methyl4, 6-dinitrophenol; and one milligram per liter (1 mg/L) for antimony;

c. Five (5) times the maximum concentration value reported for that pollutant in the permit application in accordance with UAC R317-8-3.4(7) or (10); or, d. The level established by the Executive Secretary in accordance with UAC R317- 8-4.2(6).
37Permit No. UT0000051
2. That any activity has occurred or will occur which would result in any discharge, on a non-routine or infrequent basis, ofa toxic pollutant which is not limited inthe permit, ifthat discharge will exceed the highest ofthe following "notification levels":
a. Five hundred micrograms per liter (500 ug/L); b. One milligram per liter (1 mg/L) for antimony:
c. Ten (1 0) times the maximum concentration value reported for that pollutant in the permit application in accordance with UAC R317-8-3.4(9); or, d. Tne levei established by the Executive Secretary in accordance with [lAC R317- 8-4.2(6). K. Industrial Pretreatment. Any wastewaters discharged to the sanitary sewer, either as a direct discharge or as a hauled waste, are subject to Federal, State and local pretreatment.regulations. Pursuant to Section 307 of The Water QualityAct of 1987, the permittee shall comply with all applicable federal General Pretreatment Regulations promulgated at 40 CFR 403, the State Pretreatment Requirements at UAC R317-8-8, and any specific local discharge limitations developed by the Publicly Owned Treatment Works (POTW) accepting the wastewaters. In addition, in accordance with 40 CFR 403.12(p)(1), the permittee must notify the POTW, the EPA Regional Waste Management Director, and the State hazardous waste authorities, in writing, ifthey discharge any substance into a POTW which ifotherwise disposed of would be considered a hazardous waste under 40 CFR 261. This notification must include the name ofthe hazardous waste, the EPA hazardous waste number, and the type of discharge (continuous or batch).

38Permit No. UT0000051
IV. GENERAL REQUIREMENTS A. Planned Changes. The permittee shall give notice to the Executive Secretary as soon as possible ofany planned physical alterations or additions to the permitted facility. Notice is required only when the alteration or addition could significantly change the nature or increase the quantity ofpollutants discharged. This notification applies to pollutants which are not subject to effluent limitations in the permit. In addition, ifthere are any planned substantial changes to the permittee's existing sludge facilities or their manner ofoperation or to current sludge management practices ofstorage and disposal, the permittee shall give notice to the Executive Secretary ofany planned changes at least 30 days prior to their implementation. B. Anticipated Noncompliance. The permittee shall give advance notice to the Executive Secretary ofany planned changes in the permitted facility or activity which may result in noncompliance with permit requirements. C. Permit Actions. This permit may be modified, revoked and reissued, or terminated for cause. The filing ofa request by the permittee for a permit modification, revocation and reissuance, or termination, or a notification ofplanned changes or anticipated noncompliance, does not stay any permit condition. D. Duty to Reapply. Ifthe permittee wishes to continue an activity regulated by this permit after the expiration date ofthis permit, the permittee shall apply for and obtain a new permit. The application shall be submitted at least 180 days before the expiration date of this permit. E. Duty to Provide Information. The permittee shall furnish to the Executive Secretary, within a reasonable time, any information which the Executive Secretary may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this permit, or to determine compliance with this permit. The permittee shall also furnish to the Executive Secretary, upon request, copies ofrecords required to be kept by this permit. F. Other Information. When the permittee becomes aware that it failed to submit any relevant facts in a permit application, or submitted incorrect information in a permit application or any report to the Executive Secretary, it shall promptly submit such facts or information. G. Signatory Requirements. All applications, reports or information submitted to the Executive Secretary shall be signed and certified. 1. All permit applications shall be signed by either a principal executive officer or ranking elected official.
39Permit No. UTOOOOOSl
2. All reports required by the permit and other information requested by the Executive Secretary shall be signed by a person described above or by a duly authorized representative ofthat person. A person is a duly authorized representative only if:

a. The authorization is made in writing by a person described above and submitted to the Executive Secretary, and, b. The authorization specifies either an individual or a position having responsibility for the overall operation ofthe regulated facility, such as the position ofplant manager, superintendent, position ofequivalent responsibility, or an individual or position having overall responsibility for environmental matters. (A duly authorized representative may thus be either a named individual or any individual occupying a named position.) 3. Changes to authorization. Ifan authorization under paragraphIV. G. 2 is no longer accurate because a different individual or position has responsibility for the overall operation ofthe facility, a new authorization satisfying the requirements ofparagraph 

### Jv. G.2 must be submitted to the Executive Secretary prior to or together with any reports, information, or applications to be signed by an authorized representative. 4. Certification. Any person signing a document under this section shall make the following certification: "I certify under penalty oflaw that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry ofthe person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best ofmy knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility offine and imprisonment for knowing violations." H. Penalties for Falsification ofReports. TheActprovides that any person who knowingly makes any false statement, representation, or certification in any record or other document submitted or required to be maintained under this permit, including monitoring reports or reports of compliance or noncompliance shall, upon conviction be punished by a fine ofnot more than $10,000.00 per violation, or by imprisonment for not more than six months per violation, or by both.
40Permit No. UT0000051
I. Availability ofReports. Except for data determined to be confidential under UAC R317-8-3.2, all reports prepared in accordance with the terms ofthis permit shall be available for public inspection at the office ofExecutive Secretary. As required by the

### Act, permit applications, permits and effluent data shall not be considered confidential. J. Oil and Hazardous Substance Liability. Nothing in this permit shall be construed to preclude the permittee ofany legal action or relieve the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject under the

### Act. K. Property Rights. The issuance ofthis permit does not convey any property rights ofany sort, or any exclusive privileges, nor does it authorize any injury to private property or any invasion ofpersonal rights, nor any infringement offederal, state or local laws orregulations. L. Severability. The provisions ofthis permit are severable, and ifany provisions ofthis permit, or the application ofany provision ofthis permit to any circumstance, are held invalid, the application ofsuch provision to other circumstances, and the remainder ofthis permit, shall not be affected thereby. M. Transfers. This permit may be automatically transferred to a new permittee if: 1. The current permittee notifies the Executive Secretary at least 20 days in advance ofthe proposed transfer date; 2. The notice includes a written agreement between the existing and newpermittees containing a specific date for transfer ofpermit responsibility, coverage, and liability between them; and, 3. The Executive Secretary does not notify the existing permittee and the proposed new permittee ofhis or her intent to modify, orrevoke and reissue the permit. Ifthis notice is not received, the transfer is effective on the date specified inthe agreement mentioned in paragraph 2 above. N. State Laws. Nothing in this permit shall be construed to preclude·the institution ofany legal action or relieve the permittee from any responsibilities, liabilities, or penalties established pursuant to any applicable state law orregulation under authority preserved by UCA 19-5-117. 

### 0. Water Quality-Reopener Provision. This permit may be reopened and modified (following proper administrative procedures) to include the appropriate effluent limitations and compliance schedule, ifnecessary, ifone or more ofthe following events occurs: 1. Water Quality Standards for the receiving water(s) to which the permittee discharges are modified in such a manner as to require different effluent limits than contained in 41' 

### . .
Permit No. UT0000051 this permit. 2. A final wasteload allocation is developed and approved by the State and/or EPA for incorporation in this permit. 3. A revision to the current Water Quality Management Plan is approved and adopted which calls for different effluent limitations than contained in this permit. P. Toxicity Limitation -Reopener Provision. This permit may be reopened and modified (following proper administrative procedures) to include, whole effluent toxicity (WET) limitations, a compliapce date, a compliance schedule, a change in the whole effluent toxicity (biomonitoring) protocol, additional or modified numerical limitations, or any other conditions related to the control oftoxicants ifone or more ofthe following events occur; 1. A pattern oftoxicity is detected, as per Part I, D.4 14 ofthis permit, during the duration ofthis permit. 2. The TRE results indicate that compliance with the toxic limits will require an implementation schedule past the date for compliance and the Executive Secretary agrees with the conclusion. 3. The TRE results indicate that the toxicant(s) represent pollutant(s) that may be controlled with specific numerical limits, and the Executive Secretary agrees that numerical controls are the most appropriate course ofaction. 4. Following the implementation ofnumerical control(s) oftoxicant(s), the Executive Secretary agrees that a modified biomonitoring protocol is necessary to compensate for those toxicants that are controlled numerically. 5. The TRE reveals other unique conditions or characteristics which, in the opinion ofthe Executive

**Secr~tary,**justify the incorporation ofunanticipated special conditions in the permit.

F:\WP\FACILITIES\KUCaPERMITMODIFICATION2009\MINOR.MODIFICATION.PERMJT.008

.DOC

42

### STATEMENT OF BASIS 

# FILE COPV KENNECOTT UTAH COPPER CORPORTATION RENEWAL PERMIT: DISCHARGE, BIOSOLIDS & 

### STORM WATER UPDES PERMIT NUMBER: UT0000051 UPDES MULTI-SECTOR STORM WATER GENERAL PERMIT NUMBER: UTROOOOOO MAJOR INDUSTRIAL
FACILITY CONTACTS Contact Name: Position: Number: Contact Name: Position: Number: Contact Name: Position: Number: Facility Name: Mailing Address: Actual Address: Paula H. Doughty Environmental Affairs Director (801) 569-7120 Reed Bodell Contact Name: Position: Number: Contact Narne: Superintendent ofWater Resources Position: (801) 569-7915 Number: Steve Sands Permitting Manager (801) 569

-6195 Kennecott Utah Copper Corporation POBOX6001 Magna, Utah 84044-6001 8315 West 3595 South



### DESCRIPTION OF FACILITY Scott Lawson Vice President Engineering & 

### Technical Services (801) 569-7111 Hank Hanssen Lab Director (801) 569-7900

The Kennecott Utah Copper Corporation (KUCC) is an integratedfacility which includes an open pit copper mine, copper dump leach system that is in the process of being phased out, a·concentrator, a power plant, a smelter, a refinery, a reverse osmosis (RO) plant, the North Expansion Tailings Impoundment, and a sewage treatment plant. In addition, KUCC also has post-closure responsibility for management ofheap leach rinsing and drain down from Bameys Canyon, an open pit gold mine and processing facility. The Copperton Concentrator typically processes approximately 170,000 tons of ore per day from the Bingham Canyon open pit mine by a froth flotation process to produce copper concentrate and by-product molybdenite concentrate. Approximately 170,000 tons per day of tailings from the concentrator is disposed in the tailings impoundment. The smelterprocesses copperconcentrate to produce anode copper and by-product sulfuric acid
. In the refinery, the anode copper is electrolytically refined to cathode copper. The main co-products include gold, silver, selenium, platinum, lead carbonate, and palladium. The North Tailings Impoundment is anticipated to meet operational needs for the next 25 to 30 years and is designed to store approximately 1.5 billion tons of tailings. The primary discharge from the North Impoundment reports directly to the Great Salt Lake via Outfall 012. The sediment pond and Outfall 002 will remain in place for theKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 2 discharge oftailings waterto the C-7 ditch as needed. Outfall 007 for the discharge ofseepage anddikerunoffwater from the tailings impoundment to the C7 Ditch will also remain in place. The reliance on Outfall 012 as the primary dischargepointtriggers otherwatermanagementimprovements that were addressed in modifications to the 2001 permit. Forexample selenium contaminated soils were removed from the Garfield Wetlands and the artesian flows at GarfieldWell No.5 and KesslerSprings were recycled intothe process water circuit. Otherflows such as GarfieldWetlands drainage that report to Outfall 008 were evaluatedfor quality, quantity and potential for recycle to minimize the volume of water discharged through Outfall 008. These evaluations ultimately result in lower concentrations ofselenium reporting to the west C-7 ditch andthe Great Salt Lake through Outfall 008. Priorto October 2000, parts ofthe waste rock were activelyleachedto recovercopperbyrecycling watercollected at the base ofthe dumps and placing it back on top ofthe waste rock. Impacted meteoric water and leach drain down continues to be collected in the leach collection system at the base of the waste rock. This impacted water is introduced into the tailings line at a rate of 500 to 2,000 gpm for treatment and is then discharged to the North Tailings Impoundment. KUCC will continue to collect and treat impacted waste rock flows throughout the term of this permit Groundwater in the alluvial aquifer in the southwest portion of the Salt Lake Valley has been contaminated by historic leach-watermanagementpractices. Groundwatercleanup is being conducted under an Administrative Order pursuant to Sections 106 and 107 ofthe ComprehensiveEnvironmental Response, Compensation andLiabilityAct (CERCLA), 42 U.S.C. 9606 and 9607, and involves extraction oflow pH groundwater from two wells at a rate of 1200 to 1800 gpm and introduction ofthis water to the tailings line via the Waste Water Disposal Pump Station. Excess neutralizing capacity in the tailings line resulting from lime added as a milling reagent and intrinsic neutralization capacity of the tailings provides adequate treatment of all acidic flows routed to the tailings line. KUCC will manage acidic groundwater in the tailings line throughout the term ofthis permit. KUCC also extracts neutral waterwith elevated sulfate concentrations from the leading edge oftheplume (Zone A) and treats this water using RO membrane methods to produce drinking water. The Zone A RO Plant system is discussedfurtherin subsequentportions ofthis StatementofBasis. Drinking wateris providedto thepublic through the Jordan ValleyWaterConservancyDistrict (JVWCD) in partial fulfillment ofa settlementwith the State ofUtah under a Natural Resource Damage claim. RO treatment results in a concentrate wastewater from the RO process which reports to the tailings line. JVWCD is also constructing an RO treatment plant to treat historic mine contaminated water. Concentrate wastewaterfrom the JVWCD treatmentfacility may potentiallybeintroduced at the tailings impoundment during the term ofthis permit renewal. KUCC has conducted a pilot scale Solvent Extraction/Electrowinning (SXEW) project on a lined and monitored area on the Dry Fork dump. Future plans may include additional SXEW operations on the DryFork dump. This process involves leaching oflow grade ore in waste rock with water, collectingthepregnant solution andprocessing it through a recovery circuit, that wouldbe managedconsistent with the currentpermittedpractice ofcollecting drain down from leached and non-leached waste rock. Effluentfrom the sewage treatment plant (STP) adjacent to the Refinery is hardpipeddirectly to Pump Station No.4 and incorporatedinto the process water circuit. Pump Station No.4 directs flow to the Magna Reservoirwhere itis mixed with approximately 25,000 to 40,000 gpm of recycle water from the tailings impoundment and smelter. Waterfrom the MagnaReservoir is pumped to the Copperton Concentratorwhere itis used for mineral processing.Kennecott Utah Copper Corporation UT0000051 Statement ofBasis Page3 UPDES effluent limitations for the STP are riot necessary since KUCC is not authorized to discharge the effluent otherthan back into the process system. KUCC will demonstrate that the sewage plant is operated as designed by submitting monthly operating reports to the Construction Assistance Section ofthe Division ofWater Quality. Outfall 011 was permittedthrough a modification to the permit effectiveApril7, 1999. Outfall 011 was constructed to allow discharge of spring water from Adamson Springs when it is not needed in the process water circuit. Historically, Adamson Springs waterwas incorporatedinto the process water system at Pump Station No. 1. During reconstruction of Pump Station No. 1, Adamson Springs was segregated from tailings return water in the clarification canal and can now be directed to Outfall 011. Discharge of Adamson Spring water will reduce the amount ofnew source water into the process water circuit andreduce the amount ofwater that is discharged from the tailings impoundment via Outfall 012, during the winter months. 

### FACILITY CopperMine, Copperton Concentrator, Barneys Canyon, Power Plant, Leach Collection System, Magna Tailings Impoundment and North Expansion, RO plant, Sewage Treatment Plant, Smelter, Refinery and associated facilities. 

### FACILITY LOCATION The company's active facilities are located in western Salt Lake County. The Bingham Canyon Mine, Leach Collection System, RO Plant, Barneys Canyon and Copperton Concentrator are located near Copperton, Utah. The Magna Tailings Impoundment and North Expansion, PowerPlant, Sewage Treatment Plant, Smelter and Refinery are located near Magna, Utah. 

### STANDARD INDUSTRIAL CLASSIFICATION (SIC) CODE The SIC codes are 1021 copper ore mining and milling and 3331 smelting and refining ofcopper. 

### DESCRIPTION OF THE PROCESS AND WASTEWATER SYSTEMS In 1986, KUCC initiated a surface water management plan at the mine to segregate impacted and non-impacted waters. Impacted waters are collected andmanagedthrough a leach collection system, linedreservoirs for containment and storage, Small Bingham Reservoirand/orLarge BinghamReservoir, andvarious groundwaterextraction wells from remediation activities. The leach water collection system consists of a series ofcutoff walls, collection basins, pipes, toe drains, French drains and linedcanals that collect and transport flows from leach drain down, meteoric and storm waterrunofffrom leached andnon-leached waste rock. Flows from the leached sections ofthe wasterock are pipedto theprecipitation plantfor treatment and copperrecovery, while flows from the non-leached waste rock are diverted directly into the Small and/or Large Reservoirs. The Small andLarge Reservoirs are permittedto store water from waste rock drain down, storm waterrunofffrom the mine and waste rock, certain mine tunnel flows and waterfrom various extraction wells, includingthe Bingham Canyon Alluvial well, BinghamCreek cutoffwall, Curtis Spring,theDryForkextraction well,the acid plume wells and the Copperton channel well. This water can be stored in the Small and/or LargeReservoirs or pumped to the Waste WaterDisposal Pump Station (WDPS) along with the RO treatmentplant wastewater. TheWDPS can pump up to 6,000 gpm to either the Copperton Concentrator thickeners for use in the process, or to the tai)jngs pipeline
.Kennecott Utah Copper Corporation UT0000051 Statement ofBasis Page4
Wateris collected and used at the Copperton Concentrator and consists ofwatercollectedfrom tunnels, storm water runoff, extraction well water and meteoric flows from the mine. Sources of water collected and used at the Copperton Concentrator include:
• Bingham Canyon mine pit water • Storm water from the Upper Bingham Canyon drainages surrounding the pit • Water from the North Ore Shoot (NOS) Shaft • Water pumped from the Carr Fork underground workings • BinghamTunnel water • Water from deep wells 1193 and 1201 and the sulfate extraction well Water from the Lark Clean WaterWell • Water from the Lark Shaft • Water from the Dry Fork clean water well and Mid-Valley clean water well • Treated sewage effluent water • Barneys Canyon mine pit drainage water and heap leach drain down water • Permeate and/or concentrate streams from membrane treatment

**facilitie~,** associated with the treatment of contaminated groundwater • Meteoric water, including flows from dumps, leach water drain down or other sources of contaminated surface water or groundwater. Waterfrom the NOS, upperDryFork drainages, Mid-Valleyclean waterwell, BinghamTunnel,LarkWell andLark Shaft can be routed into the process water reservoir or into the Molyfilter water tank. Otherwaters that are routed into the process waterreservoirinclude about 15,000 gpm ofoverflow from thetailings thickeners and about 6,100 gpm ofoverflow from the clarifier. When the mine wateris commingledwith Copperton concentratortailings, the combined flow, which is piped 13 miles to the tailings impoundment, could be as much as 50,000 gpm. Water from deep wells 1193 and 1201 and the sulfate extraction wells primarily provide feed water to the Zone A RO plant. As indicated, treated water from this plant is delivered to a municipal drinking water purveyor for distribution to the public; concentrate reports to the process water system. On occasion, treated oruntreated water from these wells may be directed to the process water system. The volume ofwater that may be discharged from the impoundment is consistent with the volume that could have been dischargedpriorto commingling with any zero discharge waterandincludes that volume ofwaterincorporated into KUCC's process systemthat is not necessary for process and couldhavebeen discharged priorto its integrated management. Additional flows to the tailings impoundmentinclude approximately 1,500 gpmfrom the slagconcentrator, 250 gpm from the hydrometallurgical plant, and 1,000 gpm ofwater contained in ash sluice and cooling tower blow down from the powerplant. In addition, surface water drainage from wetlands can also bedivertedinto the Tailings water management system, and flows from Garfield wells, well #10 and the Riter-North Jordan Canal or the Utah-Salt Lake canal may be diverted into the Tailings watermanagement system as needed to provide freshening ormake-up water. Under normal operating conditions, wateris pumped from the tailings impoundment decant pondto a clarification canal where up to 65,000 gpm can be recycled back to the concentrator. KUCC occasionally manages make-upKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 5
water at the tailings impoundment transfer sump and the north impoundment decant pond. As needed, water from the C-7 ditch is importedtoprovide freshening and enhance treatmentin the tailings system. Excess tailings decant water is discharged in accordance with UPDES conditions at the primary discharge point Outfall 012. Water reporting to Outfall 012 is pumped from the North Expansion via the floating decant barge pumps. The intake to these pumps has been designedto skimwaterfromjustbelow the surface in orderto reduce the potential to suspend solids from the bottom ofthe decant pond. A toe ditch has been constructed along the outerperimeter ofthe North Expansion embankment with a central toe ditch retention pond. Outfall 007 is used to discharge from the toe ditch retention pond to the C-7 ditch when KUCC does not recycle this water for reuse in the concentrators. The modernized smelter has implemented a watermanagement systemthatincorporates separate systems for smelter process water, acid plant blow down, slag mill effluent, hydrometallurgical plant effluent, sewage, storm water associated with industrial activity, and storm water not associated with industrial areas. Cooling water and plant wash down water from the Praxairoxygen plantis routed to the SmelterEast Process WaterPond. As part ofa site remediation plan approved by the Utah Division ofSolid and Hazardous Waste, approximately 100 gpm ofwater from an interceptor trench is also pumped to this pond. Smelter process water, such as granulation, slag pot cooling and casting contact cooling water, may be cooled in cooling towers priorto storagein the linedEast andWest Process WaterPonds priorto recycling. Operations atthe modernized smelter are designed to reuse contact process water within the smelter, or to recycle the required blow down ofcontact process waterto the ore concentrators viaPump Station No. 4, thereby meetingthe zero discharge effluent limitation. Non-contact cooling water from the modernized smelter will be directed to the lined East and West Process WaterPonds and recycled in smelter operations or to the Copperton Concentrator via Pump Station No.4. A hydrometallurgical plant uses the acid plant blow down and related acidic water from the smelter gas cleaning area to process solids from the flash smelterfurnace electrostatic precipitatorto recovercopper and precious metals. The flow ofacidic water to the hydrometallurgical plant is approximately 250 gpm. In addition, an estimated 50 gpm of refinery bleed electrolyte, precious metals plant blow down, and miscellaneous bleed streams will be directed to the hydrometallurgical plant for use as a reagent. An average flow of 250 gpm ofgypsum/water slurry from this plantis routed through internal Outfall 104to the tailings impoundment viathe slag concentratortailings pump system. This flow, from the hydrometallurgical plant, is regulated under the effluent guidelines applicable to acid plantblow down andrefinery spentelectrolyte with appropriate mass based limitations. Thevolume ofeffluent from the hydrometallurgical plant is mmiitored using an inline flow meter. Flow data is used both to calculate the mass effluent limitations using concentration data from Outfalls 002,007, and012 to account forthe discharge ofan equivalent volume oftreated tailings water through Outfalls 002, 007 and/or 012. The STP was constructed to treat sewage from the north end facilities, which include the modernized smelter, refinery, Praxair, PowerPlant, Railroad support and tailings impoundment support facilities as well as neutralized laboratory wastes from the process and environmental laboratories. The plant includes flow equalization, chlorination, and aerobic digestion of sludge. The STP is sized to treat 165,000 gallons per day and a peak hourly flow of47,250 gallons ofraw domestic sewage, based on a total workforce of 1350. Discharges from the plantwill consist of a clarified and chlorinated effluent, which reports directly to Pump Station No. 4 and from there to the concentrators for use as process water, and a waste sludge. The sludge is managed in accordance with applicable regulations. As described in the summaryofprevious permit changes, internal Outfall lOS was eliminated from theKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page6 UPDES permit, in 2001, because there was, and continues to be, no direct discharge ofthe effluentto waters ofthe State. Waterfrom the Tooele, Section 17, Japanese Springs, andnoncontact storm watercan be dischru:ged at Outfall 004, Outfall 008 or Outfall 012 via the Hazelton Pump and Smelter Return Canal. Surface water flows from wetlands and artesian groundwaterflows can be discharged directly through Outfall 008 consistent with applicable discharge limitations. The mine pit and mine storm runoff (without leach water) can be treated near Copperton and discharged through Outfall 005. The cemeterypond portion ofthis system was approved Aprill3, 1984 for irrigation quality water on an emergency basis. The historic discharge location was to Bingham Creek near the Jordan River; this Outfall location was subsequentlychangedto the Jordan River. There has been no discharge atthis location for years, noris any anticipated; the Outfall is retained for operational flexibility.


### SUMMARY OF CHANGES FROMPREVIOUS PERMIT The last majorpermit renewal was issued on May 21,2001. After issuance ofthis permit renewal, a minor permit modification was issued on December 5, 2001, an update to the Statement ofBasis was issued on March 27,2002, major and minor permit modifications were issued on May 30, 2002, a major permit modification was issued on August 27, 2002, and a minor permit modification was issued on March 26, 2003. The following contains a summary ofthese permit changes: 

### May 21, 2001 -Permit Renewal List of Substantive Permit Changes New Outfalls 011 (Adamson Spring) and012 (to the GreatSaltLake) were includedandOutfall 001(C-7Ditch) was deleted. Outfall 105 from the sewage treatmentplant was deleted in thepermit since there is not a direct discharge to the environment. An interim selenium limitation of 0.054 mg/L was included for dischargesfrom the tailings impoundment to the Great Salt Lake. This was based upon studiesperformed by thepermittee and is subject to change in thefuture 

### if Great Salt Lake data suggest modification is needed. Whole Effluent Toxicity (WET) testing for the tailings discharge to the GreatSaltLake in the 2001permitincludeda different test species than that required for the tailings discharge to thefreshwater C-7 ditch in the 1995permit. The zinc limitation for the tailings impoundment discharge was decreased to a daily maximum of0.5mg/L and30- day average of 0.224 mg/L. The monitoring frequencyfor high dischargeflowsfrom tailings impoundment outfalls was increased. The tailings water storage volume needed to qualify for the storm exemption was increased. Limitations for Outfall 005 were reduced based on lower flow and higher TDS in the Jordan River.

### Lower limits were included for Outfall 010 (Butterfield Tunnel discharge). Kennecott Utah Copper Corporation UT0000051 Statement ofBasis Page7



### Phenol, iron and nickel monitoring and recycle rate limitations were deletedfor the tailings impoundment discharges based on the results of monitoring data indicating further monitoring was not necessary ifrecycling continues asprescribed.


### December 5, 2001

- Minor PermitModification 

### REASONFOR MINOR PERMITMODIFICATION Thefacility requested a minor modification oftheir UPDESpermit to relocate Outfall 004. As a result ofCERCLA remediation activities, the Slag Lagoon and the 1-80 Pond were reconfigured and the Hazelton Fresh Water Pond (HFWP) was constructed. The resulting changes to the water management system necessitated relocation of Outfall 004. Water reporting to the new HFWP and reconfigured Slag Lagoon and1-80 Pond included flows thatpreviously reportedto the oldSlag Lagoon thatwerepermitted fordischarge from Outfall 004. The waterdischarged from the relocated Outfall 004 also included storm waterpreviously discharged from SW5, thereby discontinuing the need for a separatepermitted storm water outfall.

The relocated Outfall 004 waspermitted to discharge directly to the Great Salt Lake. Flow measurements and monitoring requirementsfor Outfall 004 remained the same but the sampling location description was updated.


### March 27, 2002

- Statement ofBasis Update An update to the Statement of Basiswas issuedto make minorclarifications toprocesswater flow descriptions. The minor clarifications did not constitute a modification to thepermit. 

### May 30, 2002

- Major and Minor Permit Modifications 

### REASONFOR MAJOR PERMITMODIFICATION The 2001 PermitRenewal was issuedwithout storm waterprovisions anticipating a separate storm waterpermit. The permitwas modified to consolidate all UPDESpermitting for KUCC by including storm waterprovisions for Outfalls SW1, SW2, SW3 and SW4. 

### REASONS FOR MINOR PERMITMODIFICATIONS During theperiodof January 2000 to June 2001, KUCCsuccessfully conducted fifteen acute WETtests using 100% effluent concentrations at Outfall 012. The results demonstrated that there are no acute toxic effects to the test species Cryprinodon variegatus (Sheepshead minnow). Part l.D.12 ofKUCC's UPDESpermit stated that "ifthe results for oneyearof testing indicate no toxicity, thepermittee may request a reduction in testing frequency and/or reduction to one species." Based upon thispermit condition, thepermit was modified to reduce the acute toxicity samplingfrequency at Outfall 012from monthly to quarterly when theflow is greater than 1 MGD. On December5, 2001, the DWQ issueda modifiedpermit forKUCC that approved the relocation of Outfall 004. In the Statement of Basisfor the modifiedpermit, it was stated that, "samples shall be takenfrom aflume prior toKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 8 entering the culvert beneathI-80. ''Due to unforeseen circumstances out of KUCC's control, the flume couldnotbe constructed. The modified permit reflectedthat compliance samples for Outfall 004 wouldbe takenpriorto mixing with the receiving water. Additional clarifications were also made in the modifiedpermit and included standardizing the units usedfor selenium, correcting the pH monitoringfrequency to make it consistent with other monitoring requirements, clarifying the individualflow requirementsfor WET testing, correcting references to erroneousfootnotes for Outfalls 005, 009, 010 and 012 and updating the pool volumesfor the tailings impoundment storm exemption provisions. 

### August 27, 2002

- Major Permit Modification REASONFOR MAJOR PERMITMODIFICATION Apermitcompliance schedule was included in KUCC's renewalpermiteffectiveMay 23, 2001for Outfall 008, i.e., the May 21, 2001 Permit renewal, to allow time. to reroute the high selenium sources to the tailings impoundment andcomplete treatment andwatermanagement studies defining how bestto meet the newpermitlimitations. Outfall 008 consists of artesian water from the Garfield Wells, Kessler Spring, Section 17, springs from the Tooele area, wetland discharges, and other natural springs. Aspart of thepermit compliance schedule obligations, KUCC implementedmanagementpractices to reduce the amount ofselenium discharged at Outfall 008 including the removal ofcontaminated soilsfrom the Garfield Wetlands which historically contributed to the amount of selenium that could report to Outfall 008. KUCC also contained the artesian groundwatersources with elevatedselenium levels that formerly reportedto Outfall 008 and now routes them into theprocess water circuit for treatment and use at the Copperton Concentrator. The permit modification clarified that, on rare occasions, the artesian sources may not be able to be routed into theprocess circuit, and authorized as a contingency, routing ofall flows previously discharged out Outfall 008 to the downstream side of thepipeline for Outfall 012 (through apipedconnection). Outfall 008 will discharge directly to the Great Salt Lake under those circumstances rather than via the West C-7 Ditch. The permit modification establishes that the limitationsfor Outfall 012 are applied to Outfall 008 except for cyanide and biomonitoring. 

### March 26, 2003

- Minor PermitModification REASONFOR MINOR PERMITMODIFICATION The renewal UPDES permitfor KUCC issued in May 2001, specified that "Selenium will be analyzed by the "KUCCmodifiedselenium hydrideprocedure" [ModifiedEPAMethod 7742] as approved in the October24, 1997 letter from Gilbert Lopez of the State ofUtah Bureau of Laboratory Improvement". This methodwas accepted by the Division ofWater Quality (DWQ) at the time overa standardEPA method in order to avoidpositive selenium interferences associatedwith elevateddissolvedsolids concentrations in the effluent. Recentadvances in analytical instrumentation now enable the use of a standardEPA method, specificallyEPAMethod200.8,for measuring low concentrations of selenium in elevated salt matrices. On February 8, 2003, the DWQ received KUCC's request to modify the permit to allowfor the use ofeither Modified EPA Method 7742 or EPA Method 200.8. The permit was modified to allow KUCC the use ofboth methodsfor the measurement of selenium. 

### WATER MANAGEMENT CHANGES This permit renewal incorporates changes in water management related to facility operational changes as well as other water management system improvements. This section lists facility operational changes already completedKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 9 during the term of the 2001 permit, ongoing water management activities that will continue to be implemented during the term ofthe renewal permit, and facility water management changes anticipated during the term ofthe renewal permit. Facility operational changes already completed during the term ofthe 2001 permit included: • The North Concentrator was permanently shut down • The tailings disposal from South to the North Tailings Impoundment transition was completed • The UPDES permit included coverage ofstorm water discharges • Sewage treatment plant (STP) effluent was piped to Pump Station No.4 for inclusion in KUCC's process water circuit • Outfall 105 (STP) was eliminated from the UPDES permit • Outfall 008 was connected to Outfall 012 • Outfall 004 was relocated to enable KUCC to monitor the entire drainage area subject to the CERCLA removal activities • Selenium contaminated soils were removed from the Garfield Wetlands • Atthe GarfieldWetlands, spring discharges, artesian ground water discharges, and wetlands drainages with elevated selenium levels were contained and routed to the process water circuit for treatment and use at the Copperton Concentrator Water management activjties that will continue during the term ofthe renewal permit include: • Continued management ofstorm water runoff, meteoric drainage, and leach water drain down from waste rock • Continuedmanagement ofgroundwaterextractedfrom the acidplume downgradient ofthe formerBingham Reservoir, as part of a CERCLA remedial response action • Continued management ofremediation waters containing elevated concentrations ofselenium and arsenic Facility water management changes anticipated during the term ofthe renewal permit include: • Smelter area storm water runoff management through process water system, including SW1 and SW2 overflow management via the SmelterReturn Canal process water system (resulting in deletion ofOutfalls SW1 and SW2 from UPDES permit) • The pool volume range required for storm exemption on the North Impoundment was updated • Commencement ofBameys Canyon heap leach systemrinsing and drain down following closure ofBameys Canyon •

**Full~scale** operation ofexpanded Reverse Osmosis Plant • Management oftreated sewage effluent through the tailings line • Utilization ofOutfall 008 for direct discharge ofwetlands drainage or artesian ground waterflows consistent with applicable discharge limitations


### DISCHARGE DESCRIPTION OF DISCHARGE The KUCC has been reporting self-monitoring results on Discharge Monitoring Reports on a monthly basis. A summary ofthe last 3 years ofdata is attached and there were no significant violations.Kennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 10 

### RECEIVING WATERS AND STREAM CLASSIFICATION The primaryreceiving waterfor the tailings impoundment discharge is the Great Salt Lake. Collected spring water, and occasional tailings impoundment discharges, flow into the C-7 ditch which flows into the former lower Lee Creek drainage and from there to the Great SaltLake. Mine drainage and mine storm water can also be discharged to the Jordan River ifnecessary. Inactive mine tunnels discharge to Butterfield Creek, and an ephemeral stream in Tooele County, and Pine Canyon Creek. The Great SaltLake is classified a Class 5. The C-7 ditch is classified a Class 3E. Butterfield Creekis classified a Class 2B, 3D and 4. The Jordan River at 7800 South is classified a Class 2B, 3A and 4. Pine Canyon Creek is unclassified and presumptively classified as Class 2B and 3D. Class 2B Class 3A Class 3D Class 3E Class 4 Class 5 -Protected for secondary cunlad.

**r~.::creation** such as boating, wading, or similar uses. -Protected for cold water species of game fish and other cold water aquatic life, including the necessary aquatic organisms in their food chain. -Protected for waterfowl, shore birds and otherwateroriented wildlife notincludedin Class 3A, 3B, or 3C, including the necessary aquatic organisms in their food chain. -Severely habitat-limited waters. Narrative standards will be applied to protect these waters for aquatic wildlife. -Protected for agricultural uses including irrigation ofcrops and stock watering. -The Great SaltLake. Protectedfor primary and secondary contactrecreation, aquatic wildlife, and mineral extraction. 

### BASIS FOREFFLUENT LIMITATIONS The Kennecott operations are coveredby USEPAEffluent Guidelines for the Ore Mining andDressingPoint Source Category, the Nonferrous Metals Manufacturing Point Source Category, Utah SecondaryTreatment Standards, and Utah Water Quality Standards. 

### OUTFALL 002, 007, AND 012 TAILINGS IMPOUNDMENT The flows from the mine and concentrators are usually greater than 90 percent of the flow to the tailings impoundment. Federal Ore Mining Guidelines for these categories ofwastewaters have concentrationbased limitations. The State has concluded and EPA Region VIII has concurred that concentration limits are appropriate for the discharge ofthis water from the tailings impoundment. A small amount ofdischarge to the tailings impoundment is from the hydrometallurgical plant. The flow to the hydrometallurgical plant is from the smelter acid plant, refinery bleed electrolyte, precious metals plant blowdown, andrelatedrefinery minor bleed streams. Federal Nonferrous Metals Manufacturing Guidelines for these categories of wastewaters have mass based limitations. The effluent from the hydrometallurgical plant to the tailings impoundmentis mass based and calculatedusingthe flow ofthis stream to the tailings impoundment andthe concentration of applicable constituents in the discharge from the tailings impoundment. The appropriate Ore Mining Effluent Guideline limitations in 40 CFR 440.102, best practicable technology (BPT), and40 CFR440.103, best available technology (BAT), for copper, lead, gold, silverand molybdenum ores for copper or molybdenum froth flotation are listed in Table 1.Kennecott Utah Copper Corporation

. lff0000051 Statement ofBasis Page 11

••, "-}#•

**~-** .......

.. ' 

### TABLE 1

**~ORE** 

### MINING EFFLUENT GUIDELINES

**:i:,·-··~r;· -~t:~,',4-~q:**  

## ., .· -t 

### .K

**_,, ~**  

### . -;_ ,J ·/ .

**-~** 

### Effluent Limitations _:. ''t-?



## ;~ **1Jnns** Parameter ' 

### Monthly Average Dally Minimum Daily MaXimum Total SuspendJld 

### SoJids (TSS) 20 

## NA 30 mg/L

":_ •- r. 

### Copper(Cu) 0.15 

## NA 0.30 mg/L

**~'~** ! 

### Zinc (Z,) ' 

### 0.5 

## NA 1.0 mg/L

!• 

### Lead (Pb) 0.3 

## NA 0.6 mg/L
l_

**M~rcury** 

## (Hgl 0.001 

## NA 0.002 mg/L 

### -·· l• 

### Cadmium (Cd)

**~- ~**  

### 0.05 

## NA 0.10 mg/L

,, 

### pH

**~ ;-~**  

## NA 6.5 9.0 

## su I "- .-..

**~** NA- Not Applicable The pH is limited by the Utah Secondary Standards, Utah Administrative Code (UAC) Section R317-1-3.2 to a range of 6.5

- 9.0 standard units. The limit for arsenic and zinc are based on the previous permit. Total cyanide is limitedto the former permitlimit of0.1 mg/L monthly average and 0.2 mg!L daily maximum. Mercury is based on 40 CFR 440. The oil and grease limitation of 10 mg!L maximum is based on Best Professional Judgment. An interim effluent limitation of 54 ug!L for selenium for Outfall 012 is established based upon Kennecott consultant studies ofseleniumconcentrations that are protective ofalgae andinvertebrates thatinhabitthe Great Salt Lake and to ensure that theresidues presentin these species donot accumulate in thefood chain and pose anyriskto bird reproduction. A detailed report presenting the derivation of the selenium permit limit for Outfall 012 was submitted as an addencium to the 2001 permit renewal application. This permit limit is considered interim at this time because nonumeric selenium standards havebeen establishedfor waters ofthe Great SaltLake. However, the permit will contain a reopener clause in the event additional data demonstrate the need to modify the selenium effluent limitations. · The US Army Corps ofEngineers 404Permit for the North Expansion contains a seleniumlimitof 12 ug!Lin lower Lee Creekwaternorth ofl-80thatis protective ofwildlife at the Inland SeaShorebirdReserve (ISSR). Accordingly, Kennecott is required to manage discharge from Outfalls 002 and 007 consistent with meeting the 404 permit limit for selenium in this water. The previous permit contained a recycle flow rate requirement. Since the permittee continues to recycle, a permit limitation is not considered necessary. The permittee is expected to be able to comply with all of the tailings impoundment effluent limitations.• , 1\..ennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 12

\ 1{ 

### Effluent Limitations, 

### Self-Monitoring·.and Rewrting Requirements Outfall 002 and 007
. ·.·· 

### · -·**t\rt~irnum** 

### Monthly Daily 

### Daily .· 

### Sample**·~** 

### Parameter**~~ncy** 

### · Unhs Average 

### Maxirnum Minimum 

# . Type 

## Flow " 

## NA NA NA Continuous Recorder MGD ·"• 

### TSS 20 30 

## NA 3XWeekiy Composite mg/L Tota!As 0.25 0.50 

## NA 3 XWeekly Composite mg/L Total Cd 0.05 0.10 

## NA 3 XWeekly Composite mg/L TofaiCu 0.15 0.30 

## NA 3XWeekly Composite mg/L Total Pb 0.30 0.60 

## NA 3XWeekly Composite mg/L Total 

### Hg 0.001 0.002 

## NA 3 XWeekly Composite mg/L ____:_..__ - .. 

### • Total Zh 0.224 0.50 

## NA 3 XWeekly Composite mg/L Total Se aJ 0.012 

## NA NA Monthly b/ Grab mg/L Total Cyanide 0.1 0.2 

## NA Monthly Composite mg/L Tatal Dissolved Selids 

## NA NA NA Monthly Composite mg/L (TDS) 

## on. and**(lreas~** 

## NA 10 

## NA c/ Grab mg/L pH 

## NA 9.0 6.5 3 XWeekly Grab 

## su

·c ;. ' ·n**··~!;.** 

### Effluent LlmitatioflS, 

### Self-Monitorin
. g_and**R~porting** Requirements 

### Outfall 012 ! ,, .,, 

### Parameter 

### Maximum Monthly Daily Daily 

### Frequency Sample Units 

### Average Maximum Minimum Type 

### Flow ' 

## NA NA NA Continuous Recorder MGD TSS '.'1'' 

### 20 30 

## NA Daily d/ Composite mg/L Total As 0.25 0.50 

## NA Daily d/ Composite mg/L '**Tot~l~** 

### 0.05 0.10 

## NA Daily d/ Composite mg/L

.: 

### Total 

### Ou 0.15 0.30 

## NA Daily d/ Composite mg/L Tetal Pb 0.30 0.60 

## NA Daily d/ Composite mg/L "Fetal Hg 0.001 0.002 

## NA Monthly Composite mg/L

.,**~** 

### Total Zn 0.224 0.50 

## NA Daily d/ Composite mg/L Total Se 

## NA 0.054 

## NA Daily d/ b/ Composite mg/L iotal Cyanide 0.1 0.2 

## NA Monthly Composite mg/L 

## TDS NA NA NA Monthly Composite mg/L Oil and Grease 

## NA 10 

## NA c/ Grab mg/L



## ..**~** 

### pH 

## NA 9.0 6.5 Daily Grab 

## su NA- Not Applicable

I a/ 0.012 mg/L is consistent with the requirements ofthe U.S. Army Corps ofEngineers 404 Permit #199450301 and shall not be exceeded at the Lower Lee Creek location north of Interstate 80 during a discharge from outfalls 002 and 007. b/ Selenium will be analyzed by the "Kennecott modified selenium hydride procedure" asKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 13 approved in the October 24, 1997 letter from Gilberto Lopez ofthe State ofUtah Bureau ofLaboratory Improvement, Modified EPA Method 7742 orEPA Method 200.8 or alternative method approved by the State ofUtah Bureau ofLaboratory Improvement. c/ Oil and grease will be sampled when sheen is observed. 

### dl The monitoring frequency is two times per week when the weekly average flow is between 1 MGD and 5 MGD, three times per week when the weekly average flow is between 5 MGD and 10 MGD, five times per week when the weekly average flow is between 10 MGD and 15 MGD, and daily when the weekly average flow is greater than 15 MGD. Measurement frequency is only required weekly when the Sunday through Thursday average flow is less than 1MGD and the total flow for the week is less than 10 MGD for that discharge. The frequency ofmonitoring may be modified by the Executive Secretary after one year ofmonitoring demonstrates compliance with concentrations below permit limits. 

### Tailings Pond Storm Exemption The currentpermit allows a stormexemption for the tailings impoundmentwhen there is apool volume equal to the 10-year, 24-hour stormplus a volume equal to the 24-hour accumulation ofprocess water. Recycle oftailings water to the concentrators, maintaining treatment, and minimizing the amount ofoverflow is required. For storm events, the USEPA storm exemption requirements of 40 CFR 440.13l(b) for facilities allowed to discharge will apply. Since issuance ofthe 2001 permitrenewal, Kennecott completed its active operational transition from the South to the North Tailings Impoundment. The updated pool volume required for storm exemption is calculated below: 

### North Expansion Source Normal Pool Volume Mine Storm Water at 10,000 gpm Mine Water at 2,000 gpm ' Concentrator process water discharge at 45,000 gpm Hydrometallurgical Plant, Slag Tailings water at 2,000 gpm Power Plant Ash Sluice at 1,000 gpm Direct precipitation (1017 acres) x (2 inches)x (1 foot/12 inches) Tailings Impoundment/Embankment surface area 3294 acres Runofffrom 10-year, 24-hour storm (2.0 inches),Runoff Coefficient (0.3) Runoff (3666 acres) x (2 inches) x (1 foot/12 inches)(.3) Total Capacity in acre-feet to Qualify for Storm Exemption *Dependent on Actual Pool Volume prior to storm event Acre Feet 5500-9000 44

9 133 

### 9 

### 5 170
183 6053-9553*
Information which must be submitted as part of the storm exemption includes the appropriate tailings impoundment/embankment surface area and pool area, amount of precipitation or snowmelt at the tailings impoundment and/or mine, North Expansion decant pool volume prior to the discharge, effluent concentrations, concentratorflow rate to the tailings impoundment, return flow from the tailings impoundmentto the concentrators via Pump Station No. 1, and other steps taken to maintain treatment and minimize the amount ofoverflow such as maintaining the pH in the range of 6.5 to 9.0 in the tailings impoundment to minimize metals in the discharge.h...ennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 14 

### OUTFALL 104 

### S.MELTER AND 

### REFINERY DISCHARGE The discharge from the refinery and smelter are regulated by USEPA Nonferrous Metals Manufacturing Metallurgical Acid Plant, and Spent Refinery Electrolyte point source categories. USEPA regulations require no direct discharge of smelter process wastewater but discharge is allowed from the acid plant. The acid plant is designed to produce 7.7 x 106 lbs/day of H2S04 . The Refinery is designed to produce 2.0 x 106 lbs/day average cathode production. The limitations for the smelter acid plant and refinery are mass limitations. The gypsum/water slurry effluent from the hydrometallurgical plant is regulated by the mass limitations for metallurgical acid plants and spent refinery electrolyte. Refinery casting is not included in the determination of applicable effluent limits after completion ofthe new smelter, because the refinery casting has been moved to the smelter casting area and there is zero discharge from this area. The modernized smelteris regulated under new source performance standards (NSPS). Table 2 contains NSPS for the smelter acid plant and hydrometallurgical plant effluents and Table 3 contains the smelter acid plant and hydrometallurgical plant mass discharge limits. 

### TABLE2 Smelter Acid Plant and Hydrometallurgical Plant Mass Discharge Guidelines 40 CFR 421.94 Effluent Limitations Parameter Monthly Maximum lbs/106 

### lbs Daily ,,; "\:i,· 

## - - H 2

### S04 

### Maximum lbs/106 

### 1bs H 2

### S04

4 "' 

### TSS

... ' 

### 30.650 38.310

•. ,, 

# ..,. _'i•< 

### As 1.456 

### 3.550

-

**~** " 

### Cd 0.204 0.511 "·

**~~~·** ' 

### Cu " 1.558 

### 3.269

.. •· .n• ,1 '" 

### Pb 

## . 0.332 

### 0.715

" 

### Zn



### .. 1.073 2.605

**~;1** . 

### pH l (1) (1) 

### TABLE 3 Smelter Acid Plant and Hydrometallurgical Plant Mass Discharge Guidelines 40 CFR 421.94 Effluent Limitations (Based on H2S04 production of

### 7.7 X Parameter 

### 106 

### lbs/day) 

### Moothly Maximum Daily Maximum

**~** 

### .. lbs/day lbs/day TSS 236 295
I 

### As 11.2 

### 27.3
., 

### Cd 1.57 3.93 '· 

### Cu

**~** 12.0 25.2 c-::.:·-"' ...; 

## - Pb 2.56 

### 5.51
-" 

### Zn

- 8.26 20.1

**~·**.. 

## ,. pH (1) (1)l\..ennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 15
(1) The pH is limitedbythe Utah Secondary Standards, Utah Administrative Code (UAC) Section R317-l-3.2 to a range of 6.5

- 9.0 standard units. Small flows ofspent refinery electrolyte are subject to the Spent RefineryElectrolyte effluent limitation guidelines. Table 4 contains the effluent limitation guidelines for the refinery spent electrolyte effluent andTable 5 contains the refinery mass discharge limits
.

0.0281 (2) 

### 0.068 0.030 

### 0.063 0.018 

### 0.027

(1) (1)

1.18 0.06 0.14 0.060 0.13 0.04 

### 0.054

(1) (1) (1) The pHis limited by the Utah Secondary Standards, Utah Administrative Code (UAC) Section R317

- 1-3.2 to a range of 6.5

- 9.0 standard units
. (2) The Arsenic number differs from the effluent limitation guidelines in that it is more stringent and is continued from a previous permit consistent with the anti-backsliding provision of the CWA. In order to calculate the allowable discharge limits from Outfall 104, DWQ added the values in Tables 3 and 5 to produce total mass limits in Table 6 applicable to the smelter acid plant, hydrometallurgical plant, and refinery discharge. The discharge is directed to the tailings impoundment where further treatment through precipitation, sedimentation, and clarification occurs in the tailings impoundment decant pond to meet the mass limitations, especially for total suspended solids. Compliance with mass limitations is calculated by first multiplying the flow from the hydrometallurgical plant by the ratio of tailings impoundment wastewater discharge rate divided by the total wastewater inflow to the tailings impoundment to determine the portion attributable to the hydrometallurgicalKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 16 plant. Finally, this discharge flow rate is multiplied times the tailings impoundment discharge concentrations to determine the mass discharged. 

### TABLE 6**~·** 

### - Smelter Acid Plant!Hydrometallurgical Plant/Refinery Mass Discharge LimHs Outfall1 04


### · Effluent Limitations Par ameter Monthly Maximum Daily Maximum c·,

_ J 

### lbs/day lbs/day 

## TSS 237 296



### As 11.3 27.5 '(·,!· 

### .... Cd**~.,_** 7, 1.57 3
.93
F 

### Ou _!. 12.1 25.3 ;, 

# . .. •'1. 

### Pb ...,. 2.56 5.51

.**~·** ...!..,..• , 

### Zn '" 8.26 20.1 

### OUTFALL 005 MINE WATER The discharge was originally approved for storm water and mine drainage discharge from the mine in 1984. Ithas not been used recently because the water now normally flows to the tailings impoundment. In the event operational failure prevented usage of the mine water collection, diversion and treatment system, mine water and additional storm water could be neutralized with lime, treated and discharged to the Jordan River subject to the Ore Mining Limitations and Water Quality Standards. A wasteload analysis of 5 MGD discharge to a low flow of 32 cfs and TDS of 1175 mg/L in the Jordan River is attached. The sources ofore mining limitations 40 CFR 440.103, previous discharge quality, or water quality WLA are listed in the following table. Due to a new WLA: total cadmium, copper, lead, mercury, iron and selenium are more stringent than in the previous permit.
" '"' ·'i·· .; 

### Effluent Limitations, Self-Monitoring and Reporting Requirements 

### Outfall 005 · ']t' ,, 

### P

arame ter Maximum Mon thly Daily Dally 

### Frequency ample Units 

### Aver age Maximum Minimum 

### Type Flew 

## NA NA NA Daily 

### a/ Measured MGD i SS 20 30 

## NA 2 XWeekly Grab mg/L Total As 

## NA 0.23 

## NA 2 XWeekly Grab mg/L Total Cd 0.0028 0.0198 

## NA 2 XWeekly Grab mg/L Total Cu 

## NA 0.12 

## NA 2 XWeekly Grab mg/L Total'Pb 0.063 0.510 

## NA 2 XWeekly Grab mg/L 

### TotaiHg 0.00006 b/ 0.00077 

## NA 2 XWeekly Grab mg/L

.. 

### Total Zn 0.75 1.50 

## NA 2 XWeekly Grab mg/L Total Fe 

## NA 3.06 

## NA 2 XWeekly Grab mg/L Selenium 

### cJ 0.014 0.056 NA 

### 2 XWeekly Grab mg/L 

### Total Dissolved Solids 

## NA 1200 

## NA 2 XWeekly Grab mg/L (TDS) Oil and Grease 

## NA 10 

## NA d/ Grab mg/L

.; 

### pH 

## NA 9.0 6.5 Daily Grab 

## suh
...cnnecott Utah Copper Corporation UT0000051 Statement ofBasis Page 17 a/ For intermittent discharges, the duration ofthe discharge shall be reported. b/ Kennecott will voluntarily analyze mercury using a low level total mercury analysis. c/ Selenium will be analyzed by the "Kennecott modified selenium hydride procedure" as approved in the October 24, 1997letterfrom GilbertoLopez ofthe State ofUtah Bureau ofLaboratoryImprovement, ModifiedEPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. d/ When sheen is observed NA -Not Applicable During the first week ofdischarge, aluminum, and silver shall also be sampled and analyses submitted with the first discharge report. 

### OUTFALLOOS Outfall 008 consists ofartesian water from the Garfield Wells, Kessler Spring, Section 17, Tooele Spring, wetland discharges, and natural springs. Surface water and artesian groundwaterwith elevated seleniumlevels will continue to be contained and routed to the process water circuit for treatment and use at the Copperton Concentrator. However, surface water or artesian groundwater meeting discharge limitations can also be discharged through Outfall 008. The discharge is monitored quarterly for the same parameters as Outfall 012 except for cyanide and biomonitoring. Selenium limits are considered interim at this time until selenium standards can be established for waters ofthe Great Salt Lake. 

### EffToent Umltations, Self-Monitoring 

### and

**R~P ~rting**  

### Requirements Outfall 008

**~._;_:·'·::~t.(ii•**

## \.: Parameter 

### Maximum

_ Monthly 

### Dally Dally 

### Frequency Sample
··!



## u'l~~ **F**

**.t"~h'** i

**,~** 

### ,. •

**~Verage** 

### Maximum Mrn1mum '• 'TY¢
.

... 

### Flow 

## NA NA NA Quarterly Measured MGD 7

**~'** \':; 

### TSS 20 30 

## NA Quarterly Grab mg/L ·'-' 

### Total

**A~** 

### 0.25 0.50 

## NA Quarterly Grab mg/L , 

### .. \ 

### Totai'Cd 0.05 0.10 

## NA Quarterly Grab mg/L 

### total Cu 0.15 0.30 

## NA Quarterly Grab mg/L 

### Total Pb 0.30 0.60 

## NA Quarterly Grab mg/L 

### Total Hg 0.001 0.002 

## NA Quarterly Grab mg/L

**Ta~IZn** 

### 0.224 0.50 

## NA Quarterly Grab mg/L 

### Selenium 

## NA 0.054 NA 

### Quarterly Grab mg!L 

### Total Dissolved Solids 

## NA NA NA Quarterly Grab mg/L 

### (TDS) 011 and Grease 

## NA 10 

## NA a/ Grab mg/L 

### pH 

## NA 9.0 6.5 Quarterly Grab 

## su a/ When sheen is observed NA -Not Applicable.

### OUTFALL 004 RUNOFF AND ARTESIAN WATER Kennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 18

Storm water runoff from the drainage behind the smelter through the Kessler drainage channel, the flow from Japanese Springs, excess water from Tooele Spring and Section 17 which has not been used for process can be discharged at relocated Outfall 004. The discharge will be sampled andreported for the same parameters as Outfall 008.


### OUTFALL 009 PINE CANYON TUNNEL Outfall 009 consists ofless than 30 gpm ofwaterfrom the Pine Canyon Tunnel, a former mine. The majority ofthis water seeps into the ground before it reaches the intermittent stream. The discharge will be limited to the same concenirmions as Outfall 002 excepr for cyanide and biomoniroring. Company dara indicares rhar dissolved solid concentrations after mixing with the stream (when flowing) are not likelyto exceedthe Class 3D standards and are characterized by lower constituent concentrations than documented in storm water in this drainage
.

•.r. 

### Effluent Llmitatlor:ts, Self-Monit(:)ring and

### Reporting**Requirement~** 

### Outfall 009 - •, '·' r 

### Maximum Mor:tthly [!)ally 

### Daily Sample 

### Parameter**Fre:qu~ncy** 

### Units**~** 

### Average Maximum Minimum Type 

## II**.~;** 

### Flaw I <'· 

### NA NA NA 2 XYearly Measured MGD 

### I\**·~-** 

## TSS 20 30 

### NA 2 XYearly Grab 

### mg/L ¥I 

### Total As 0.25 0.50 

### NA 2 XYearly Grab 

### mg/L

,; 

### TotaiCd 0.05 0.10 

### NA 2 XYearly Grab 

### mg/L**~** •· 

### Total Cu 0.15 0.30 

### NA 2 XYearly Grab 

### mg/L 

## l t. .. Total Pb 0.30 0.60 

### NA 2 XYearly Grab 

### mg/L 'J!: 

### Total Hg 0.001 0.002 

### NA 2 XYearly Grab 

### mg/L

·.. • 

### Tatal Zn 0.224 0.50 

### NA 2 XYearly Grab 

### mg/L 

### Selenium b/ 0.012 

### NA NA 

### 2 XYearly Grab mg/L 

### Total Dissolved Solids NA NA NA 2 XYearly Grab 

### mg/L**~TDS)** 

### Oil and Grease NA 10 

### NA a/ 

### Grab 

### mg/L 

### •**~H** 

### NA 9.0 6.5 2 XYearly Grab 

## su a/ When sheen is observed b/ Selenium will be analyzed by the "Kennecott modified selenium hydride procedure" as approved in the October 24, 1997 letterfrom Gilberto Lopez ofthe State ofUtah Bureau ofLaboratoryImprovement, ModifiedEPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau of Laboratory Improvement. NA- Not Applicable. 

### OUTFALL 010 BUTTERFIELD TUNNEL Outfall 010 consists of water from the Butterfield Tunnel, a former mine. The discharge will be sampled and reported for the same parameters as the tailings impoundment except for cyanide. The discharge is to comply withKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 19 the most restrictive standard from Ore Mining guidelines 40 CFR 440.103, class 3D aquatic life or class 4 agricultural waterquality standards listedin the following table. The agricultural standardisused as a maximumfor total dissolved solids, arsenic, andleadbecause the existingqualityis significantlybetterthan the calculatedeffluent limitations. 

### Effluent Umitations. Self-Monitodng ancl.
.Re.porting 

### Requirements Outfall 

### 010 :•· .·•**.~** .J. " 

# .

.," 

### Maximum Monthly Daily Daliy .;_

### ... 

## smnple Parameter Average Maximum Minimum Ftequ6mcy Ty.pe 

### Ullits



### · Flow 

## NA NA NA Quarterly Measured MGD



### TSS**~** 

### 20 30 

## NA Quarterly Grab 

### mg/L**~**.. 

### Total 

### As
. 

## J NA 0.10 

## NA Quarterly Grab 

### mg/L**Total~** -, 

### . 0.0044 0.015 

## NA Quarterly Grab 

### mg/L '.'• ·f 

### -:t:otal Ou 0.050 0.083 

## NA Quarterly Grab 

### mg/L**~** 

### Tetal 

### Fe
.. '-:'!.' 

## NA 1.52**~** 

## NA Quarterly Grab 

### mg/L 

# X**"~t :**  

### . Totai 1 Pb ,,.- . 

### 0.023 0.100 

## NA Quarterly Grab 

### mg/L

,. .t· i 

### Total Hg**~~:~** 

### I 0.00002 a/ 0.00023 

## NA Quarterly Grab 

### mg/L 

## iJ ·**~\~:** 

### Total Zn 0.446 0.493 

## NA Quarterly Grab 

### mg/L I.-' 

### Seleniumb/ 0.007 0.029 NA 

### Quarterly Grab mg/L



# ralai Dlssalved Solids 

## NA 1200 

## NA Quarterly Grab 

### mg/L 

### (TDS,

. · ;· 

### Oil 

### and 

### Grease 

## NA 10 

## NA c/ 

### Grab 

### mg/L**-~** '
. 

### . ........... 

### pH ·» 

## NA 9.0 6.5 Quarterly Grab 

## su a/ Kennecott will voluntarily analyze mercury using a low level total mercury analysis. b/ Selenium will be analyzed by the "Kennecott modified selenium hydride procedure" as approved in the October24, 1997 letterfrom Gilberto Lopez ofthe State ofUtah Bureau ofLaboratoryImprovement, ModifiedEPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau ofLaboratory Improvement. / c/ When sheen is observed NA- Not Applicable. 

### OUTFALL 011 ADAMSON SPRING This discharge is a natural spring. However, there is the potential for relatively small amounts ofprocess water to commingle with the spring water. The discharge will be limitedfor total suspended solids (TSS), copperand zinc as listed in the Ore Mining Effluent Guideline limitations in 40 CFR440.102, bestpracticable technology (BPT), and 40 CFR 440.103, best available technology (BAT). These limitations are more restrictive than the ground water permit. ThepHis limitedbythe Utah Secondary Standards, Utah Administrative Code (UAC) Section R317-1-3.2 to a range of 6.5-9.0 standard units. Oil and Grease is limited by Best Professional Judgment to 10 mg/L. Maximum limitations for arsenic and selenium are based upon the ground waterpermit for this spring. Maximum limitations of0.01 mg!L for cadmium and lead are Best Professional Judgment based upon Company sample dataKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 20 for total metal concentrations of the proposed discharge from Outfall 011. These limitations are higher than the ground water permit because they are for total metals instead ofdissolved and are maximums instead of average values. Total dissolved solids (TDS) are to be monitored but not limited because ofthe proximity to the Great SaltLake. Effluent LtmHatlons,r1Self-Monitoring andRepOrting Requirements Outfall 011 :• ,, 

### '

Parameter Maximum Monthly 

### Daily Dally Frequency Sample 

### Units Average Maximum Minimum Type



### . Fl0w 

## NA NA NA Quarterly Measured MGD

TSS ,.. 20 30 

## NA Quarterly Grab mg/L Total 

## As NA 0.013 

## NA Quarterly Grab mg/L TotaJCd 

## NA 0.01 

## NA Quarterly Grab mg/L Total Cu 0.15 0.30 

## NA Quarterly Grab mg/L n·

**~~;/..:: Total**  Pb 

## NA 0.01 

## NA Quarterly Grab mg/L TotaiZn 0.224 0.50 

## NA Quarterly Grab mg/L

.self)flium 

### a/ 

## NA 0.013 NA Quarterly Grab mg/L Oil and Grease 

## NA 10 

## NA b/ Grab mg/L



## . pH 

## NA 9.0 6.5 Quarterly Grab 

## su a/ Selenium will be analyzed by the "Kennecott modified selenium hydride procedure" as approved in the October24, 1997letterfrom GilbertoLopez ofthe State ofUtah BureauofLaboratoryImprovement, ModifiedEPA Method 7742 or EPA Method 200.8 or alternative method approved by the State of Utah Bureau ofLaboratory Improvement. b/ When sheen is observed NA- Not Applicable Leach System The Ore Mining and Dressing Point Source Category, 40 CFR 440.103 (c), requires that there be no discharge of process wastewater to navigable waters from leach operations except under defined circumstances. The zero discharge provisions do not apply to drain down ofwaterfrom the inactive waste rock leaching operations orother inactive facilities in theprocess ofbeing closed. In thatregard, Kennecottis treating drain down frominactive waste rock leaching operations with the neutralization capacity contained in coppertailings, and discharging the treated drain down to thetailings impoundment. No leach water ordrain down wateris authorizedto dischargetoBingham Creek or the Jordan River. Treatment of waste rock drain down is expected to continue during the term of this permit. Section 40 CFR 440.131(c) authorizes a discharge ofprocess waterifthe facility is designed, constructed andmaintainedto contain the maximum volume from a 10-year24-hourprecipitation event. The capacity ofthe Small BinghamReservoiris 79.3 acre-feet andthe total combinedcapacity ofthe Zone 1 and 2 Large BinghamReservoirs is 1770 acre-feet. No such flows are authorized to discharge to Bingham Creek orthe Jordan River. The zero discharge design has been and will continue to be sufficient to prevent a discharge to Bingham Creek or Jordan River.

### SELF-MONITORING AND REPORTING REQUIREMENTS K.ennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 21

The permit will require reports to be submitted monthly, quarterly and yearly as applicable, on DischargeMonitoring Report (DMR) forms due 28 days after the end ofthe monitoring period. Lab sheets for biomonitoring must be attached to the biomonitoring DMR.


### STORM WATER STORMW ATER REQUIREMENTS Rather than having a separate storm waterpermit, the discharge of storm water shall be covered under this permit. The principal storm waterrequirementis the development ofa Pollution Prevention Plan, as detailed in the permit. The plan may be modified to reduce but not eliminate the inspection frequency, training, etc. where there is containment of the 25-year, 24-hour storm runoff at new facilities. It may also be modified to reduce but not eliminate the frequency of these where there is containment of the 10-year, 24-hour storm runoff at existing facilities. 

### Smelter Area Storm Water RunoffManagement in Process Water System KUCC has developed a comprehensive stormwatermanagement systemfor the modernized smelter, which includes containment ofthe 25-year 24-hour storm atthe modernized smelter. Therevisedmanagement system eliminates the need for storm water Outfalls SW1 and SW2. The following briefly describes the system. Storm water discharges are collected and channeled through the smelter area utilizing a series of engineered channels andpiping to convey storm waterto a pairofstorm waterponds not designedto discharge. Runofffrom the operating facilities is routed to eitherthe West StormWaterPond, with a 3.5 million gallon storage capacity; orthe East Storm WaterPond, with a 6.5 million-gallon storage capacity. A 40-acre area drains to theWest Storm Water Pond. Ofthis, approximately 37 acres consists ofimpervious asphalt surfaces and buildingroofs. Facilities draining to this pond primarily consist of the west parking area, office areas and the asphalted area once occupied by the former AcidPlant7 and 8. An area of90 acres drains to the East StormWaterPond. Ofthis, approximately 58 acres consists ofimpervious asphalt surfaces and building roofs. Primary facility areas draining to this pond include the repair and machine shop area, the modernized smelter and reclaimed areas. When storm water collects in the HDPE-lined West and East Storm Water Ponds, up to 350 gpm and 600 gpm respectively are pumpedto the smelterWest and East Process WaterPonds. In response to a significant storm event, any overflow from the West orEast StormWater Ponds will flow to the process water system through the Smelter Return Canal. The West and East Storm Water Ponds accept overflow from the West Process Water and East Process Water Ponds, respectively, during plant upset conditions such as power failures. When normal operations are restored, the water in the Storm Water Ponds is pumped back to the Process Water Ponds. Non-operational areas will have storm waterrunoffrouted to three different locations. Approximately 127 acres of native and reclaimed areas on the west side of the facility will drain to Japanese Springs via diversion channels reporting to the newly reconfigured Hazleton Fresh Water Pond or used for process makeup water with eventual discharge to the tailings impoundment orGreat SaltLake. Approximately79 acres ofeast side native and reclaimed areas will drain to operational wetlands northeast ofPraxair via diversion channels. An additional 3500 acres of land including both native and reclaimed areas, the smelter landfill, and Kessler Canyon will drain to the KesslerKennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 22 drainage channel which flows to the SmelterReturn Canal for recycle backto the concentrator orto the Great Salt Lake via Outfall 008. The majority ofthis acreage is attributable to Kessler Canyon at 3450 acres. Outfall SW3, Little Valley Storm Water Storm waterrunofffrom the area southeast ofthe North Concentratorcomplexmay flow to the Little ValleyWash in the event ofa significant storm. Outfall SW3 will be the monitoring point for this flow. Discharge from Outfall SW3 will onlyoccurin response to a storm largerthan a 10-year 24-hourevent. BestManagementPracticesrequired for this discharge are that the discharge will occur only in response to a storm event and the discharge will be sampled as soon as practicable after flow is observed bypersonnel in the area. Test results will be reported for the same parameters as the tailings impoundment except for cyanide and biomonitoring. Outfall SW4, Pine Canyon Storm Water Outfall SW 4 consists of storm water runofffrom the Pine Canyon drainage to Pine Canyon creek. The discharge will be monitored and sampled, ifpresent, as soon as practicable after a major storm event. This shall occurat least twice per year, if discharge is present. Test results will be reported for the same parameters as Outfall 009.
PRETREATMENT REQillREMENTS There is currently no discharge of process wastewater to the community of Magna sanitary sewer system. Any process wastewaterthatthe facility maywantto discharge to the public sanitary sewerin the future, either as direct discharge or as a hauled waste, would be subject to federal, state and local pretreatment regulations. Pursuant to section 307 ofthe Clean Water Act, the permittee shall comply with all applicable Federal General Pretreatment Regulations promulgated, found in40 CFR section403, the State PretreatmentRequirements found in UACR317- 8-8, and any specific local discharge limitations developed by the Publicly Owned Treatment Works (POTW) accepting the waste.
BIOMONITORING REQillREMENTS As part ofa nationwide effort to control toxics, biomonitoringrequirements are being includedin all majorpermits and in minor permits for facilities where effluent toxicity is an existing or potential concern. Authorization for requiring effluent biomonitoring is provided for in UAC R317-8-4.2 andR317-8-5.3. The Whole Effluent Toxicity (WET) Control Guidance Document, February 15, 1991, outlines guidance to be used by Utah Division ofWater Quality staffandbypermittees for implementation ofWET control through the UPDES discharge permitprogram. Outfall 012, which discharges directly to the Great SaltLake, requires WET testing using the species Cryprinodon variegatus (sheepshead minnow) on a quarterlybasis when the flow is greaterthan 1MOD. Testing ofMysidopsis bahia (mysid shrimp) indicatedthat calciumconcentrations above 350mg!LeffectedMysidopsis bahia. Monitoring ofthe calcium concentration will beperformed and ifthe concentration drops below 350 mg!L, additional testing of the mysid shrimp is required to determine the appropriateness ofthis species. Additionally, ifKUCC discharges from Outfall 002, it shouldconductWETtests using Ceriodaphnia dubia. Those tests should be performed monthly if the monthly average flow exceeds 10 MOD. Monitoring is only required1\..ennecott Utah Copper Corporation UT0000051 Statement ofBasis Page 23 quarterly when the monthly average flow is less than 10 MGD. Because Outfall 002 discharges to aclass 3E stream, only acute toxicity testing has been required. IfKUCC discharges from Outfall 007, it must conduct WET tests quarterly using Cryprinodon variegatus ifthe quarterly average flow has exceeded one (1) MGD. A limitation ofno acute toxicity (LC 50) has beenrequired tobe effective since June 1, 1993 and will continue upon there-issuance of the permit for Outfalls 002 and 005. No acute toxicity at 012 for sheepshead minnow is now required. Provisions are in the permit for additional testing in the event 50 percent toxicity occurs and for conducting a toxicity reduction evaluation (TRE) in the event it becomes necessary at Outfalls 002 or 005. Only a yearly biomonitoring test using 

### Ceriodaphnia dubia is required for Outfall 010 because it is not an active mine portal. Biomonitoringis also required quarterly ofdischarge 005 because there is normally no discharge and the flow is not to exceed 5 MGD. 

### PERMIT DURATION It is recommended that this permit be effective for a duration offive (5) years. Drafted by · Jennifer Robinson, Discharge

Tom Rushing, Storm Water Utah Division ofWater Quality