INDIANA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT We Protect Hoosiers and OurEnvironment. 100 N. Senate Avenue • Indianapolis, IN 46204 (800) 451-6027 • (317) 232-8603 • www.idem.IN.gov Michael R. Pence Governor Thomas W. Easterly Commissioner

VIA ELECTRONIC MAIL
Mr. Robert Lange Environmental Control Manager U.S. Steel Corporation One North Broadway Gary, IN 46402
DearMr. Lange: March 21, 2014

Re: NPDES PermitNo. IN0000281 Draft PermitModification Gary Works Facility Gary, Indiana, Lake County
Your request for a permit modificationhas been reviewed and processed in accordance with rules adopted under 327 IAC 5. Enclosed is a copy ofthe draft permit modification. Pursuantto IC 13-·15-5-1, IDEM will publish a general notice in the newspaper withthe largest general circulation withinthe above county. A 30-day commentperiod is available in orderto solicit input from interested parties, including the general public.
Please review this draft permitmodification and associated documents carefully to become familiar with the proposed terms and conditions. Comments concerning the draft permit modification shn1ld be submitted in accordance with the procedure outlined inthe encloser public notice f(yr!:. We suggestthat youmeet with us to discuss major concerns or objectic,:

.. you may have '· 'itl the draftpermitmodification. Questions concerning this draft permit modification may he addressed to Nikki Gardner ofmy staff, at 317/232-8707 or ngardner@idem.in.gov.

Enclosures

cc: Lake County Health Department . Sincerely,



# ~D~

Stan Rigney,V



# C~~ Industrial NPDES Permits Section Office ofWater Quality

Chief, Permits Section, U.S. EPA, Region 5 Lauren Legler, USS Gary Works

AnEqual Opportunity Employer AStatethatWorks 

# - @ RecycledPaperSTATE OF INDIANA Page 1 of 139 PermitNo. IN0000281

DEPARTMENT OF ENVIRONMENTAL MANAGEMENT
AMENDED AUTHORIZATION TO DISCHARGE UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions ofthe Federal Water Pollution Control Act, as amended, (33 U.S.C. 1251 et seq., the "Act"), and IDEM'spermitting authority under IC 13-15,
U.S. STEEL-GARYWORKS UNITED STATES STEEL CORPORATION
is authorized to discharge only via outfall locations designated inthis permit, from an Integrated Steel Mill facility which manufactures iron and steel products, and coke and coke makingbyproducts that is located at One North Broadway, Gary, Indiana 46402, to receiving waters namedthe Grand CalumetRiver and Lake Michigan in accordance with effluent limitations, monitoring requirements, and other conditions set forth inParts I, II, III, and IV hereof.
The permit, as issued on January 22, 2010, and subsequently modified onMarch 16, 2012 and February 8 2013, is hereby amended, to apply streamlined mercury variances, as contained herein. The amended provisions shall become effective

-------. All terms and conditions ofthe permitnot modified atthis time remain in effect. Further, any existing condition or term affectedby the amendments will remain ineffectuntil the amended provisions become effective. This permitmaybe revoked for the nonpayment ofapplicable fees in accordance with IC 13-18-20.
This permit andthe authorizationto discharge, as amended, shall expire at midnightFebruary 28, 2015. In orderto receive authorization to discharge beyond the date ofexpiration, the permittee shall submit suchinformation and forms as are required by the Indiana Department ofEnvironmental Management no laterthan 180 days prior to the date ofexpiration. Signed on_________________for the Indiana Department ofEnvironmental Management.

Paul Higginbotham, Chief Permits Branch Office ofWater QualityPage 2 of 139 PennitNo. IN0000281

TREATMENT FACILITY CLASSIFICATION
The discharger has seven industrial wastewatertreatment plants rated as Class D, classified in accordance with 327 IAC 5-22, Classification ofWastewater Treatment Plants.
PART I
A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. Duringthe period beginning on the effective date ofthis permit and lasting until the permittee redirects the flow from Outfall 010 to Outfall 005, the permittee is authorized to discharge from Outfall 005. The discharge is limited to non-contact cooling water used in the coal preparation, coke and coke byproducts manufacturingprocesses, non-contact cooling water used inthe coke oven gas desulfurization facility, non-contact cooling water used inthe coke plantboiler houses, treated process wastewater from the coke and coke byproducts manufacturing processes (internal Outfall 501), steam condensate, and stormwater runoff. Samples taken in compliance withthe monitoring requirements below shall be taken at a point representative ofthe discharge butpriorto entry into the Grand Calumet River.
This Table is no longer applicable and has been removed. The redirection ofOutfall 010 through Outfall 005 was completed June 5, 2011. The combined discharge is regulated in Part I.A.2.Parameter Flow Oil & Grease [1] Selenium [5] Benzene Benzo-a-pyrene

Interim Final [13] Ammonia (as N) Free Cyanide [2][17] Season 1 [16] Season 2 [16] Mercury [5][7] [20] Page 3 of139 PermitNo. IN0000281 2. During the periodbeginning whenthe flow from Outfall 010 has been redirected to Outfall 005, the permittee is authorized to discharge the combined flow through Outfall 005. The discharge is limitedto noncontact cooling waterused inthe coalpreparation, coke and coke byproducts manufacturing processes, non-contact cooling water used in the coke oven gas desulfurization facility, non-contact cooling water used in the coke plant boiler houses, treatedprocess wastewater from the coke and coke byproducts manufacturingprocesses (internal Outfall 501), steam condensate, and storm waterrunoff. Samples taken in compliance with the monitoring requirements below shall betaken at a point representative ofthe discharge butpriorto entry into the Grand Calumet River. Such discharge shall be limited and monitored by the permittee as specified below:

DISCHARGE LIMITATIONS [6][11][14] Outfall 005

Table 1 Quantity orLoading Monthly Daily Quality or Concentration Monthly Daily Monitoring Requirements Measurement Sample Average Maximum Report Report

2.1 Report Report 0.047 Report

3.5 3.1 4.2 Report Report 0.12 Report

8.2 6.6 Units Average Maximum MGD Report lbs/day 4.1 lbs/day Report lbs/day Report lbs/day 0.093 lbs/day Report lbs/day lbs/day 6.9 6.0 Report 8.2 Report
1.0 0.23 Report
16.1 13 mg/1 ug/1 ug/1 ug/1 ug/1 ug/1 ug/1 ug/1 Frequency

**~** Daily Continuous 2 X Weekly 3 Grabs/24 Hrs. 1 X Weekly 24-Hr. Comp. 3 X Monthly 3 Grabs/24-Hrs 2XWeekly 2XWeekly 2XWeekly
2XWeekly 2XWeekly 24-Hr. Comp. 24-Hr. Comp. 24-Hr. Comp.
See PartI.Q. See Part I.Q. WQBEL's 0.00066 0.0016 lbs/day 1.3 3.2 Report ng/1 ng/1 ug/1 ug/1 mg/1 mg/1 Bi-Monthly [15] Bi-Monthly [15] Daily [9] 2XMonthly 2XMonthly 2XMonthly Grab Grab Grab Interim Discharge Limit [12]

------ Total Residual Chlorine [8][3] 4.1 Fluoride Report Chloride Report Sulfate Report Whole Effluent Toxicity [18] Interim Final Temperature [4] 9.2 [10] Report Report Report

Quality or Concentration
Parameter pH Daily Daily Minimum Maximum

6.0 9.0 lbs/day lbs/day lbs/day lbs/day 2.4 [21] 8 Report Report Report Report 1.0

Table2

Units s.u. 18 Report Report Report

Report 24-Hr. Comp. 24-Hr. Comp. 24-Hr. Comp. Quarterly [19] 24-Hr. Comp. Quarterly [19] 24-Hr. Comp. 2 X Weekly 6 Grabs/24-Hrs.
Monitoring Requirements Measurement Sample Frequency

**~** 3 X Weekly Grab
[1] Additional monitoring andreporting requirements are contained in Part I.O., Visible Oil Corrective ActionMonitoring Program.Page4 of139 PermitNo. IN0000281 [2] Cyanide shall be measured and reported as Available (Free) Cyanide. See Part LQ. for additional requirements. [3] See Part LG. ofthe permitfor Pollutant Minimization Requirements. [4] See Part liLA., for additional Temperature Requirements. [5] The permittee shall monitor andreport the identifiedmetals as total recoverable metals. [6] See Part LB. ofthe permit for the Narrative Water Quality Standards. [7] The permittee applied for, and received, a variance from the water quality criterionused to establishthe referenced mercury WQBELs under the streamlinedmercury variance (SMV) procedures of327 lAC 5-3.5. Compliance withthe interim discharge limit will demonstrate compliance with this permit. See Part IV ofthe permit for additional requirements related to the SMV. [8] See Part LP. for Zebra and Quagga Mussel Control and Chlorination for additional requirements. [9] Monitoring for TRC shall be 1 X Daily during Zebraor Quaggamussel intake chlorination, and continue for three additional days after zebra or quagga mussel treatment has been completed. [10] Compliance withthe daily maximum mass value will be demonstrated ifthe calculated mass value is less than 30.7 lbs/day for Outfall 005. [11] See the Fact Sheet for the water treatment additives in use at Outfall 005 that have beenreviewed and are approved for use at this facility bythe Commissioner. In the eventthat changes are to be made inthe use ofwater treatment additives including dosage rates contributing to Outfall 005, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required inPart ILC.1 of this permit. The use ofany new or changed water treatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity informationmust be provided with any notification regarding any new or changed water treatment additives or dosage rates. [12] Forthe term ofthe NPDES permit, the permittee is subjectto the interim discharge limit developed underthe provisions of327 lAC 5-3.5-8. Each reporting period (i.e., bi-monthly), the permittee shall reportboth a daily maximum value and an annual average value for mercury. The annual average value shall be calculated as the average ofall daily values from the mostrecent twelve-monthperiod. Reporting ofthe annual average value for mercury is not required during the first year ofthe permit term. Compliance withthe interimPage 5 of 139 PermitNo. IN0000281 discharge limitwill be achieved whenthe average ofdaily values measured over the mostrecent (rolling) twelve-monthperiod is less thanthe interim discharge limit. [13] Thepermittee has up to a thirty-four (34) month schedule ofcompliance from the effective date ofthe permit as outlined in PartJ.D. ofthe permit inwhich to meet the final effluentlimitations for Benzo(a)pyrene and the limits for Whole Effluent Toxicity (WET). Interim limitations shall apply until the final limits take effect. [14] To ensure thatprocess waters from current coke plant operations are not discharged, US Steel shall certifyto that effectwith eachmonthly discharge monitoring report as follows:
"I certify that, to the best ofmy knowledge and belief, andhaving consultedwiththe manager ofcoke plant operations and coke plant personnelresponsible for managing and disposing ofcokemaking and byproductrecovery wastewater, thatprocess wastewaters generated from cokemaking and by-productrecovery operations have notbeen discharged to the Grand Calumet River or to Lake Michigan through any outfall or conveyance sincethe last discharge monitoring report, except for the treated coke plantby-productrecovery wastewater inInternal Outfall 501." [15] Bi-Monthlymonitoring shall be conducted inthe months ofFebruary, April, June, August, October, and December ofeach year. [16} Season 1 ("salmonids absent") limitations apply April 1- September 30 ofeach year. Season 2 ("salmonids present") limitations apply October 1- March 31 of eachyear. These seasons are based ontimes when salmonids occur at the site. [17] US Steel may develop the appropriate studies to determine an alternate season. [18] See PartI.L. ofthe permitfor Biomonitoring Requirements. [19] Samples shall be taken once at any time during each ofthe four annual quarters: (A) January-February-March; (B) April-May-June; (C) July-August-September; and (D) October-November-December.
For quarterlymonitoring, inthe first quarter for example, the permittee may conduct sampling withinthe month ofJanuary, February orMarch. The result from this reporting timeframe shall be reported onthe MarchDMR, regardless of which ofthe months withinthe quarter the sample was taken.Page 6 of139 PermitNo. IN0000281
[20] The following EPAtestmethods and/or Standard Methods and associated LODs and LOQs are to be used inthe analysis ofthe effluent samples. Alternative methods may be used iffirst approved by IDEM.
Parameter Mercury EPAMethod 1631, RevisionE LOD 0.2 ng/1 

### LOQ 0.5 ng/1 [21] Annual average for the purpose ofthe mercury interim discharge limit.Parameter
Flow TSS Oil & Grease Selenium [1] Benzene Benzo-a-pyrcne Naphthalene Phenols (4AAP) Ammonia (as N) Cyanide [2]

Total Free

Parameter pH Page 7 of139 PermitNo. IN0000281 3. Duringthe period beginning on the effective date ofthis permit and lasting until the expiration date, the permittee is authorizedto discharge cokemaking and by-product recovery areatreatment system water including groundwater from the East Side Solid Waste ManagementArea (SWMA), from Internal Outfall SOl through Outfall 005, to the Grand Calumet River. Samples taken in compliance with the monitoring requirements below shall be taken at a pointrepresentative ofthe discharge but priorto commingling with any otherprocess or non-process waters. Such discharge shall be limited and monitored bythe pennittee as specified below:

DISCHARGE LIMITATIONS Internal OutfalL501 Quantity or Loading Quality or Concentration Monitoring Requirements Monthly Daily Monthly Daily Measurement Sample Average Maximum Units Average Maximum Units Frequency**~** Report Report MGD Daily Continuous

706 1,359 lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. Report 50.4 lbs/day Report Report mg/1 2 X Weekly 3 Grabs/24 Hrs. Report Report lbs/day Report Report ug/1 2XWeekly 24-Hr. Comp. Report 0.25 lbs/day Report Report ug/1 3 X Monthly 3 Grabs/24-Hrs

0.08 0.15 lbs/day Report Report ug/1 2X Weekly 24-Hr. Comp. 0.09 0.15 lbs/day Report Report ug/1 2X Weekly 24-Hr. Comp. 0.25 0.50 lbs/day Report Report ug/1 2X Weekly 24-Hr. Comp. 27.9 40.4 lbs/day Report Report ug/1 2XWeekly 24-Hr. Comp.
27.7 41.0 lbs/day Report Report ug/1 2 X Weekly See PartLQ. Report Report lbs/day Report Report ug/1 2 X Weekly See PartLQ.

Table 2 Quality orConcentration Monitoring Requirements Daily Daily Measurement Minimum Maximum Units Frequency Report Report s.u. 1 X Weekly

[1] The permittee shall monitor and report the identified metals as total recoverable metals. [2] Cyanide shall be measured and reported as Total and Available (Free) Cyanide. See PartI.Q. for additional requirements. Sample**~** GrabPage 8 of 139 PermitNo. IN0000281

4. Duringthe period beginning onthe effective date ofthis permit and lasting until the flow CUITently discharging from Outfall 010 has beenre-directed through Outfall 005, the permittee is authorized to discharge non-contact cooling waterused in coal preparation, coke and cokebyproducts manufacturingprocesses, and storm water runoffvia Outfall 010 to the Grand CalumetRiver. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butpriorto entry into the Grand CalumetRiver.
This Table is no longer applicable and has beenremoved. The redirection ofOutfall 010 through Outfall 005 was completed June 5, 2011. The combined discharge is regulated in Part I.A.2.Parameter
Flow Page 9 ofl39 PermitNo. IN0000281 5. During the period beginning onthe effective date ofthis permit, the permittee is authorized to discharge non-contact cooling water from blast furnace and sinterplant, steam condensate, treated SWD-1 Landfill wastewater, North Tennessee StreetDrainage Sump effluent, and storm waterrunoffthough Outfall 015 to the Grand Calumet River. Samples taken in compliance with the monitoring requirements below shall be taken at apointrepresentative ofthe discharge but priorto entry into the Grand Calumet River. Such discharge shall be limited and monitored by the permittee as specified below:

DISCHARGE LIMITATIONS [1][11][13] Outfall 015
Table 1 Quantity orLoading Quality or Concentration Monthly Daily Monthly Daily Average Mmdmum Average Maximum Report Report MGD Monitoring Requirements Measurement Sample Frequency**~** Daily Continuous Total Suspended Solids Report Report lbs/day Report Report mg/1 1 X Weekly 24-Hr. Comp. Oil & Grease [2] Ammonia (as N) CBOD5 Free Cyanide [3] Phenols (4AAP) Lead [4] Zinc [4] Temperature [5] Report Report Report Report Report Report Report Report Report Report Report Report Report lbs/day Report lbs/day Report lbs/day Report lbs/day Report lbs/day Report lbs/day Report Report mg/1 Report mg/1 Report mg/1 Report ug/1 Report ug/1 Report ug/1 Report ug/1 Report oF 1 X Weekly Grab 1X Weekly 24-Hr. Comp. 1 X Weekly 24-Hr. Comp. 1 X Weekly See Part I.Q. 1X Weekly 24-Hr. Comp. 1X Weekly 24-Hr. Comp. 1X Weekly 24-Hr. Comp. 1 X Weekly 6 Grabs/24-Hrs. Total Residual Chlorine [12] 0.11 0.26 [6] lbs/day 8 18 ug/1 Daily [7] Grab Mercury [4][8][14] WQBEL's 0.000018 0.000045 lbs/day 1.3 3.2 ng/1 Bi-Monthly [10] Grab Interim Discharge Limit [9]

------ 3.7 [15] Report ng/1 Bi-Monthly [10] Grab

Parameter pH Quality orConcentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table2 Monitoring Requirements Measurement Sample Frequency**~** 1 X Weekly Grab [1] The discharge ofnon-contact cooling waters from blast furnace and sintering operations is permitted only through Outfalls 015, 018, 019, and 035. [2] Additional monitoring and reporting requirements are contained in Part 

### 1.0., Visible Oil Corrective ActionMonitoring Program. [3] Cyanide shall be measured and reported as Available (Free) Cyanide. See Part I.Q. for additional requirements. [4] The permittee shall measure and report identified metals as total recoverable metals. [5] See PartIII.A., for additional Temperature Requirements.Page 10 of 139 PermitNo. IN0000281 [6] Compliance withthe daily maximum mass value will be demonstrated ifthe calculated value is less than 0.85 lbs/day. [7] Monitoring for TRC shall be 1X Daily during zebra or quagga mussel intake chlorination, and continue for three additional days after zebraor quaggamussel treatment has been completed. See Part I.P. for Zebra and QuaggaMussel Control and Chlorination for additional requirements. [8] The permittee applied for, andreceived, a variance from the water quality criterion used to establishthe referenced mercury WQBELs under the streamlinedmercury variance (SMV) procedures of327 lAC 5-3.5. Compliance withthe interim discharge limit will demonstrate compliance with this permit. See Part IV ofthe permit for additional requirements related to the SMV. [9] Forthe term ofthe NPDES permit, the permittee is subjectto the interim discharge limit developed under the provisions of327 lAC 5-3.5-8. Each reportingperiod (i.e., bi-monthly), the permittee shall report both a daily maximumvalue and an annual average value for mercury. The annual average value shall be calculated as the average ofall daily values from the mostrecent twelve-monthperiod. Reporting ofthe annual average value for mercury is not required during the first year ofthe permitterm. Compliance withthe interim discharge limitwill be achieved whenthe average ofdaily values measured over the mostrecent (rolling) twelve-monthperiod is less thanthe interim discharge limit. [10] Bi-monthlymonitoring shall be conducted inthe months ofFebruary, April, June, August, October, and December ofeachyear. [11] See the Fact Sheet for the water treatment additives inuse at Outfall 015 thathave beenreviewed and are approved for use at this facility bythe Commissioner. In the eventthat changes are to be made inthe use ofwater treatment additives including dosage rates contributing to Outfall 015, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required in Part II.C.1 of this permit. The use ofany new or changed water treatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity informationmust be provided with any notificationregarding any newor changed water treatment additives or dosage rates. [12] See Part I.G. ofthe permitfor Pollutant MinimizationRequirements. [13] See Part LB. ofthe permitfor the Narrative Water Quality Standards. [14] The following EPA test methods and/or Standard Methods and associated LODs and LOQs are to be used in the analysis ofthe effluent samples. Alternative methods may beused iffirst approved by IDEM.Parameter Mercury EPA Method 1631, Revision E 

### LOD 0.2 ng/1 Page 11 of 139 PermitNo. IN0000281 

### LOQ 0.5 ng/1 [15] Annual average for the purpose ofthe mercury interim discharge limit.Parameter
Flow Total Suspended Solids Oil & Grease Ammonic (as N) CBOD, Free Cyanide [1] Phenols \4AAP) Lead 12] Zinc [21 Benzo(a)?yrene pH
[1]

[2]

[3] Page 12 of 139 PermitNo. IN0000281 6. Duringthe periodbeginning onthe effective date ofthis permit, the permittee is authorizedto discharge treated SWD-1 Landfill wastewaters through Outfall607 to the Grand CalumetRiver via Outfall 015. Samples taken incompliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butpriorto commingling with any otherprocess ornon-process waters. Such discharge shall be limited and monitored by the permittee as specifiedbelow:

DISCHARGE LIMITATIONS [4] Outfall607 Quantity orLoading Quality or Concentration Monthly Daily Monthly Daily Average Maximum Units Average Maximum Report Report MGD Report Report lbs/day 30.0 60.0 10.0 15.0 Report Report lbs/day Report Report Report Report lbs/day Report Report Report Report lbs/day Report Report Report Report lbs/day Report Report Report Report lbs/day Report Report Report Report lbs/day Report Report Report Report lbs/day Report Report Report Units

mg/1 mg/1 mg/1 mg/1 mg/1 mg/1 mg/1 mg/1 mg/1 s.u. Monitoring Requirements Measurement Sample Frequency

**~** Daily Continuous 1 X Weekly 24-Hr. Comp. 1 X Weekly Grab 1 X Weekly 24-Hr. Comp. 1 X Weekly 24-Hr. Comp. 1 X Monthly See PartI.Q. 1X Monthly 24-Hr. Comp. 1 X Monthly 24-Hr. Comp. 1 X Monthly 24-Hr. Comp. 1 X Quarter[3] 24-Hr. Comp. 1 X Weekly Grab Cyanide shall be measured and reported as Available (Free) Cyanide. See Part I.Q. for additional requirements.
Thepermittee shall measure and report identified metals as total recoverable metals. Samples shall be taken once during each ofthe four annual quarters: (A) January-February-March; (B) April-May-June; (C) July-August-September; and (D) October-November-December.
For quarterly monitoring, in the first quarter for example, the permittee may conduct sampling within the month ofJanuary, February orMarch. Theresult from this reporting timeframe shall be reported onthe MarchDMR,regardless of which ofthe months within the quarterthe sample was taken. [ 4] ByJanuary 31st ofeachyear, US Steel will provide all Mercury data collectedfor this outfall for the previous year.Parameter
Flow Oil & Grease [2][14] Ammonia (as N) Free Cyanide [4] Phenols (4AAP) Copper [5] Mercury [5][15][7][17] WQBEL's Page 13 of 139 PermitNo. IN0000281 7. During the period beginning onthe effective date ofthis permit, the permittee is authorizedto discharge blastfurnace and sinterplantnoncontact cooling water, storm water runoffandturbo-boilerblowdown, stockhouse misc. steam condensate & air conditionernon-contact water through Outfall 018 to the Grand Calumet River. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butpriorto entry into the Grand Calumet River. Such discharge shall be limited and monitored bythe permittee as specified below:

DISCHARGE LIMITATIONS [1][10][13] Outfall 018

Table 1 Quantity orLoading Quality or Concentration Monitoring Requirements Monthly Daily Monthly Daily Average Maximum Average Maximum Report Report MOD Report Report Report Report lbs/day Report Report Report lbs/day Report Report Report lbs/day Report Report Report Report lbs/day Report Report
0.00063 0.0016 lbs/day 1.3 3.2 mg/1 mg/1 mg/1 mg/1 mg/1 ng/1 Measurement Sample Frequency**~** Daily 1 X Weekly 2XMonthly 1 X Monthly 1 X Monthly 1 X Weekly Continuous Grab 24-Hr. Comp. See Part I.Q. 24-Hr. Comp. 24-Hr. Comp. Bi-Monthly[12] Grab Interim Discharge Limit[6]------ 2.9[16] Report ng/1 Bi-Monthly[12] Grab Temperature [3] Report oF 2 X Weekly 6 Grabs/24-Hrs. Total Residual Chlorine [11] 3.9 8.7 [8] lbs/day 8 18 ug/1 Daily [9] Grab

Parameter pH
[1]

[2]

[3] [4]

[5]

[6] Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2 Monitoring Requirements Measurement Sample Frequency**~** 1 X Weekly Grab
The permittee may discharge noncontact cooling water from blast furnace and sintering operations only through Outfalls 015, 018, 019, and 035.
Additional monitoring and reporting requirements are contained in Part I.O., Visible Oil Corrective Action Monitoring Program.
See PartIII.A. ofthepermitfor the Temperature Requirements. Cyanide shall bemeasured and reported as Available (Free) Cyanide. See Part I.Q. for additional requirements.
Thepermittee shall measure andreport identified metals as total recoverable metals.
Forthe term ofthe NPDES permit, the permittee is subjectto the interim discharge limit developed under the provisions of327 lAC 5-3.5-8. EachPage 14 of 139 PermitNo. IN0000281 reportingperiod (i.e., bi-monthly), the permittee shall reportboth a daily maximum value and an annual average value for mercury. The annual average value shall be calculated as the average ofall daily values from the mostrecent twelve-monthperiod. Reporting ofthe annual average value for mercury is not required during the first year ofthe permit term. Compliance withthe interim discharge limit will be achieved when the average ofdaily values measured over the mostrecent (rolling) twelve-monthperiod is less thanthe interim discharge limit. [7] The permittee applied for, andreceived, a variance from the water quality criterion used to establishthe referenced mercury WQBELs underthe streamlined mercury variance (SMV) procedures of327 lAC 5-3.5. Compliance withthe interim discharge limitwill demonstrate compliance withthis permit. [8] Compliance with the daily maximum mass value will be demonstrated ifthe calculated mass value is less than 29.1 lbs/day. [9] Monitoring for TRC shall be 1 X Daily during zebra or quagga mussel intake chlorination, and continue for three additional days after zebra or quagga mussel treatment has been completed. See PartI.P. for Zebra and QuaggaMussel Control and Chlorination for additional requirements. [10] See the Fact Sheet for the water treatment additives inuse at Outfall 018 thathave beenreviewed and are approved for use at this facility bythe Commissioner. In the eventthat changes are to be made inthe use ofwater treatment additives including dosage rates contributingto Outfall 018, the permittee shall notify the Indiana Department ofEnvironmental Management as required inPart II.C.1 of this permit. The use ofanynew or changed water treatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity information must be provided with any notification regarding any newor changedwatertreatment additives or dosage rates. [11] See Part I.G. ofthe permitfor Pollutant MinimizationRequirements. [12] Bi-monthlymonitoring shall be conducted inthe months ofFebruary, April, June, August, October, and December ofeach year. [13] See Part LB. ofthe permitfor theNarrative Water Quality Standards. [14] Ifoil and grease is measured in the effluent in significant quantities, the source ofsuch discharge is to be investigated and eliminated. The facility is required to investigate and eliminate any significant or measured concentration ofoil and grease (quantities inexcess of5 mg/1). The intent ofthis requirement is to assure that oil and grease is not addedto once-through cooling water in measurable quantities (5 mg/1).Page 15 of 139 Permit No. IN0000281 [15] The following EPA test methods and/or Standard Methods and associated LODs and LOQs are to be used in the analysis ofthe effluent samples. Alternative methods may be used iffirst approved by IDEM.
Parameter Mercury EPA Method 1631, Revision E LOD 0.2 ng/1 

### LOQ 0.5 ng/1 [16] Annual average for the purpose ofthe mercury interim.discharge limit. [17] See Part IV ofthe permit for additional requirements related to the SMV.Parameter Page 16 of 139 PermitNo.IN0000281 8. During the periodbeginning onthe effective date ofthis permit, the permittee is authorized to discharge blast furnace and sinterplantnoncontact cooling water, storm water runoff, power station and No.2 Q-BOP non-contact cooling water, CWTplantbrine regenerant, turboboiler blowdown and steam condensate through Outfall 019 to the Grand Calumet River. Samples taken in compliance withthe monitoring requirements below shall betaken at a pointrepresentative ofthe discharge butpriorto entry into the Grand Calumet River. Such discharge shall be limited and monitored bythe permittee as specified below:

Quantity orLoading Monthly Daily DISCHARGE LIMITATIONS [1][9][11] Outfall 019

Table 1 Quality orConcentration Monthly Daily Average Maximum Average Maximum Monitoring Requirements Measurement Sample Frequency

**~** Flow Report Report MGD Daily Continuous Oil & Grease [12][14] Report Report mg/1 1X Weekly Grab Temperature [2] Free Cyanide [3] Report lbs/day Report OF Report mg/1 2 X Weekly 6 Grabs/24-Hrs. 1X Monthly See Part LQ. Mercury [4][6][15][17] WQBEL's 0.00053 Interim Discharge Limit[5]

------- 0.0013 lbs/day 1.3 3.2[16] 3.2 ng/1 Bi-Monthly [10] Grab Report ng/1 Bi-Monthly [10] Grab Ammonia (as N) Report Report Report 7.4 [7] lbs/day Report Report mg/1 2 X Monthly 24-Hr. Comp. 1X Monthly 24-Hr. Comp. Phenols ( 4AAP) Report lbs/day Report Report mg/1 Total Residual Chlorine [13] 3.3 lbs/day 8 18 ug/1 Daily [8] Grab

Parameter pH Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2 Monitoring Requirements Measurement Sample Frequency

**~** 1 X Weekly Grab [1] The permittee may discharge non-contact cooling waters from blast furnace and sintering operations onlythrough Outfalls 015, 018, 019, and 035. [2] See Part III.A. ofthepermit for the Temperature Requirements. [3] Cyanide shall be measured and reported as Available (Free) Cyanide. See Part I.Q. for additional requirements. [4] The permittee shall measure and report identified metals as total recoverable metals. [5] Forthe term ofthe NPDES permit, the permittee is subjectto the interim discharge limit developed underthe provisions of327IAC 5-3.5-8. Each reporting period (i.e., bi-monthly), the permittee shall reportboth a daily maximum value and an annual average value for mercury. The annual average value shall be calculated as the average ofall daily values from the mostrecent twelve-monthperiod. Reporting ofthe annual average value for mercury is notPage 17 of 139 PermitNo. IN0000281 annual average value for mercury is not required during the first year ofthe permit term. Compliance with the interim discharge limit will be achieved when the average ofdaily values measured overthe mostrecent (rolling) twelve-month period is less than the interim discharge limit. [6] The permittee applied for, and received, a variance from the water quality criterion used to establish the referenced mercury WQBELs under the streamlined mercury variance (SMV) procedures of327 lAC 5-3.5. Compliance withthe interim discharge limitwill demonstrate compliance withthis permit. [7] Compliance with the daily maximum mass value will be demonstrated ifthe calculated mass value is less than 24.7 lbs/day. [8] Monitoring for TRC shall be 1 X Daily during zebra orquaggamussel intake chlorination, and continue for three additional days after zebra or quagga mussel treatment has been completed. See Part I.P. for Zebra and QuaggaMussel Control and Chlorination for additional requirements. [9] See the Fact Sheet for the water treatment additives inuse at Outfall 019 that have beenreviewed and are approved for use at this facility by the Commissioner. In the eventthat changes are to be made inthe use ofwater treatment additives including dosage rates contributing to Outfall 019, the permittee shall notifY the IndianaDepartment ofEnvironmental Management as required in Part II.C.1 of this permit. The use ofany new or changed water treatment additives or dosage rates shall not cause the discharge from any pennitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity information mustbe provided with any notification regarding any new or changed water treatment additives or dosage rates. [10] Bi-monthlymonitoring shall be conducted inthe months ofFebruary, April, June, August, October, and December ofeach year. [11] See Part LB. ofthepermit for the Narrative Water Quality Standards. [12] Additional monitoring and reporting requirements are contained inPart I.O., Visible Oil Corrective Action Monitoring Program. [13] See PartI.G. ofthe permit for Pollutant Minimization Requirements. [14] Ifoil and grease is measured in the effluent in significant quantities, the source ofsuch discharge is to be investigated and eliminated. The facility is required to investigate and eliminate any significant or measured concentration ofoil and grease (quantities in excess of5 mg/1). The intent ofthis requirement is to assure that oil and grease is not added to once-through cooling water in measurable quantities (5 mg/1).Page 18 of 139 PermitNo. IN0000281 [15] The following EPAtest methods and/or Standard Methods and associated LODs and LOQs are to be used in the analysis ofthe effluent samples. Alternative methods may be used iffirst approved by IDEM.
Parameter Mercury EPA Method 1631, Revision E LOD 0.2 ng/1 

### LOQ 0.5 ng/1 [16] Annual average for the purpose ofthe mercury interim discharge limit. [17] See Part IV ofthe permit for additional requirements related to the SMV.Parameter
Flow Page 19 of 139 PermitNo. IN0000281 9. During the period beginning onthe effective date ofthis permit, the permittee is authorized to discharge No. 1BOP Shop non-contact cooling water, No.1 continuous casternon-contact cooling water, steam condensate, and storm waterthrough Outfall 020 to the Grand Calumet River. Samples taken in compliance withthe monitoring requirements below shall be taken at a point representative ofthe discharge butprior to entry into the Grand CalumetRiver. Such discharge shall be limited and monitored by the permittee as specified below:

Quantity or Loading Monthly Daily DISCHARGE LIMITATIONS [1][9][11] Outfall 020
Table 1 Quality or Concentration Monthly Daily Average Maximum Units Average Maximum Report Report MGD Monitoring Requirements Measurement Sample Frequency**~** Daily Continuous Oil & Grease [2][13] Temperature [3] Lead [4] Report Report Report Report Report lbs/day Report Report mg/1 Report oF Report mg/1 1X Weekly Grab 2 X Weekly 6 Grabs/24-Hrs. 2 X Monthly 24-Hr. Comp. 2 X Monthly 24-Hr. Comp. Zinc [4] lbs/day Report Report mg/1 Mercury [4][6][14][16] WQBEL's 0.00087 0.0022 lbs/day 1.3 3.2 ng/1 Bi-Monthly [10] Grab Bi-Monthly [10] Grab InterimDischarge Limit[5]

------- 7.8[15] Report ng/1 Ammonia (as N) Report Report 12 [7] lbs/day Report Report mg/1 2 X Monthly 24-Hr. Comp. Total Residual Chlorine [12] 5.4 lbs/day 8 18 ug/1 Daily [8] Grab

Parameter pH Quality orConcentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2 Monitoring Requirements Measurement Sample Frequency**~** 1 X Weekly Grab [1] There shall be no discharge ofany steelmaking areaprocess wastewater (steelmaking, vacuum degassing and continuous casting) or otherprocess wastewaters from Outfall 020. [2] Additional monitoring and reporting requirements are contained in Part I.O., Visible Oil Corrective Action Monitoring Program. [3] See Part liLA. ofthe permit for the Temperature Requirements. [ 4] The permittee shall measure and report identified metals as total recoverable metals. [5} For the term oftheNPDES permit, the permittee is subjectto the interim discharge limit developed under the provisions of327 lAC 5-J.S-8. Each reporting period (i.e., bi-monthly), the permittee shall reportboth a daily maximum value and an annual average value for mercury. The annual average value shall be calculated as the average ofall daily values from the mostrecent twelve-monthperiod. Reporting ofthe annual average value for mercury is notPage 20 of 139 PermitNo. IN0000281 required during the first year ofthe permitterm. Compliance withthe interim discharge limit will be achieved whenthe average ofdaily values measured over the mostrecent (rolling) twelve-monthperiod is less thanthe interim discharge limit. [6] The permittee applied for, and received, a variance from the water quality criterionusedto establish the referenced mercury WQBELs underthe streamlined mercury variance (SMV) procedures of327 IAC 5-3.5. Compliance with the interim discharge limit will demonstrate compliance withthis permit. [7] Compliance withthe daily maximum mass value will be demonstrated ifthe calculatedmass value is less than 40.3 lbs/day. [8] Monitoring for TRC shall be 1 X Daily during zebra or quaggamussel intake chlorination, and continue for three additional days after zebra or quaggamussel treatment has been completed. See Part I.P. for Zebra and QuaggaMussel Control and Chlorination for additional requirements. [9] See the Fact Sheet for the watertreatment additives in use at Outfall 020 that have beenreviewed and are approved for use atthis facility bythe Commissioner. In the eventthat changes are to be made inthe use ofwater treatment additives including dosage rates contributing to Outfall 020, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required in Part II.C.1 of this permit. The use ofany new or changed watertreatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity information must be provided with any notificationregarding any new or changed watertreatment additives or dosage rates. [10] Bimonthlymonitoring shall be conducted in the months ofFebruary, April, June, August, October, and December ofeach year. [11] See Part I.B. ofthe permit for the Narrative Water Quality Standards. [12] See PartI.G. ofthe permit for Pollutant Minimization Requirements. [13] Ifoil and grease is measured inthe effluent in significant quantities, the source ofsuch discharge is to be investigated and eliminated. The facility is required to investigate and eliminate any significant ormeasured concentration ofoil and grease (quantities in excess of5 mg/1). The intent ofthis requirement is to assure that oil and grease is not added to once-through cooling water inmeasurable quantities (5 mg/1). [14] The following EPAtest methods and/or Standard Methods and associated LODs and LOQs areto be used inthe analysis ofthe effluent samples. Alternative methods may be used iffirst approved by IDEM.Parameter Mercury EPA Method 1631, Revision E 

### LOD 0.2 ng/1 Page 21 of 139 PennitNo. IN0000281 

### LOQ 0.5 ng/1 [15] Annual average for the purpose ofthe mercury interim discharge limit. [16] See Part IV ofthe permit for additional requirements related to the SMV.Parameter
Flow Oil & Grease Page 22 of 139 PermitNo. IN0000281 10. Duringthe period beginning on the effective date ofthis permit, the permittee is authorized to discharge air compressor cooling water, air conditioning condensates, steam condensate, and stonn waterrunoff through Outfall 021 to the Grand Calumet River. Samples taken in compliance with the monitoring requirements below shall be taken at a point representative ofthe discharge but priorto entry into the Grand CalmnetRiver. Such discharge shall be limited and monitored bythe permittee as specified below:

Quantity or Loading Monthly Daily DISCHARGE LIMITATIONS [1][4][5] Outfall 021

Table I Quality or Concentration Monthly Daily Average Maximum Units Average Maximum Report Report MGD Monitoring Requirements Measurement Sample Frequency

**~**

Total Residual Chlorine [6] 0.040 0.090 [2] Report lbs/day 8 lba/day Report Report 18 Report mg/1 ug/1 ug/1 1X Monthly 1X Monthly Daily [3] 2XMonthly Estimate Grab Grab Grab Ammonia (as N) Report

Parameter pH Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2 Monitoring Requirements Measurement Sample Frequency

**~** 1X Monthly Grab [1] There shall be no discharge ofprocess wastewaters through this outfall. [2] Compliance withthe daily maximmn mass value will be demonstrated ifthe calculated mass value is less than 0.3 lbs/day. [3] Monitoring for TRC shall be 1X Daily during zebra or quagga mussel intake chlorination, and continue for three additional days after zebra or quaggamussel treatmenthas been completed. See Part I.P. for Zebra and Quagga Mussel Control and Chlorination for additional requirements. [ 4] See the Fact Sheet for the watertreatment additives in use at Outfall 021 thathave beenreviewed and are approved for use atthis facility by the Commissioner. In the eventthat changes are to be made inthe use ofwater treatment additives including dosage rates contributing to Outfall 021, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required in Part ILC.1 of this permit. The use ofany new or changed water treatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity informationmust be provided with any notificationregarding any new or changed water treatment additives or dosage rates. [5] See Part LB. ofthe permit forthe Narrative Water Quality Standards.Page 23 of 139 PermitNo. IN0000281 [6] See Part I.G. ofthe pennit for Pollutant Minimization Requirements.Parameter
Flow Oil & Grease Ammonia (as N)

Parameter pH Page 24 of 139 PermitNo. IN0000281
11. During the period beginning onthe effective date ofthis permit, the permittee is authorizedto discharge air conditioning and steam condensates and stom1 waterrunoffthrough Outfall 023 to the Grand CalumetRiver. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butpriorto entry into the Grand Calumet River. Such discharge shall be limited and monitoredby the permittee as specifiedbelow:
DISCHARGE LIMITATIONS [1][2][3] Outfall 023

Table 1 Quantity orLoading Quality orConcentration Monthly Daily Monthly Daily Average Maximum Units Average Maximum Report Report MGD Report Report Report lbs/day Report Report
Table 2 Quality or Concentration Daily Daily Minimum Maximum Units 6.0 9.0 s.u. Units
mg/l ug/1

[1] There shall be no discharge ofprocess wastewaters throughthis outfall. Monitoring Measurement Frequency
1 X Monthly 1 X Monthly 2XMonthly
Monitoring Measurement Frequency 1 X Monthly

[2] See the Fact Sheet for the water treatment additives in use at Outfall 023 that have been reviewed and are approved for use atthis facility bythe Commissioner. In the eventthat changes are to be made inthe use ofwatertreatment additives including dosage rates contributing to Outfall 023, the permittee shall notify the IndianaDepartment ofEnviromnentalManagement as required inPartII.C.l of thispermit. The use ofany new or changed watertreatment additives or dosage rates shall not cause the discharge from anypermitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity information mustbeprovided with any notification regarding any new or changed watertreatment additives or dosage rates. [3] See PartLB. ofthe permit for the Narrative Water Quality Standards. Requirements Sample

**~** Estimate

Grab Grab
Requirements Sample

**~** GrabParameter
Flow Oil & Grease

Parameter pH
[1]

[2] [3] Page 25 of 139 PermitNo. IN0000281 14. During the periodbeginning onthe effective date ofthis permit, the pennittee is authorized to discharge air conditioning and steam condensates, and storm water runoffthrough Outfall 026 to the Grand Calumet River. Samples taken in compliance with the monitoring requirements below shall be taken at a pointrepresentative ofthe discharge but priorto entry into the Grand Calumet River. Such discharge shall be limited and monitoredby the permittee as specified below:
DISCHARGE LIMITATIONS [1][2][3] Outfall 026 (Inactive)

Table I Quantity or Loading Quality or Concentration Monthly Daily Monthly Daily Average Maximum Units Average Maximum Report Report MGD Report
Table 2 Quality or Concentration Daily Daily Minimum Maximum Units

6.0 9.0 s.u. Monitoring Measurement Units Frequency
I X Monthly mg/1 I X Monthly
Monitoring Measurement Frequency I X Monthly

US Steel shall notify the Compliance Evaluation Section ofthe Office ofWater Quality (OWQ) at least 30 days priorto re-activation ofthis outfall.
See PartLB. ofthe permit for the Narrative Water Quality Standards.
There shall be no discharge ofprocess wastewaters throughthis outfall. Requirements Sample Ivru<
Estimate Grab
Requirements Sample Ivru< GrabFlow Page 26 of 139 PermitNo. IN0000281 15. During the period begi1ming on the effective date ofthis permit, the permittee is authorized to discharge treated wastewater from steelmaking, vacuum degassing, continuous casting and hot forming process wastewaters (Internal Outfall603), storm water runoff, non-contact cooling water and direct contact slab cooling water through Outfalls 028 and 030 to the Grand CalumetRiver. The permittee is authorizedto discharge from Outfalls 028 & 030 (combined total) and reported as Outfall 600 to the Grand Calumet River. Samples taken in compliance with the monitoring requirements below shall be taken at apoint representative ofthe discharge but prior to entry into the Grand Calumet River. Such discharge shall be limited and monitored by the permittee as specified below:

Quantity orLoading Monthly Daily DISCHARGE LIMITATIONS [1][9][11] 028/030 (Outfall 600)

Table 1 Quality or Concentration Monthly Daily Aventge Maximum Units Average Maximum
MGD Monitoring Requirements Measurement Sample Frequency

**I.YQ.~** Daily Total Suspended Solids Oil & Grease [4] Report 2,038 1,274 Report 5,933 2,807 lbs/day Report lbs/day Report Report Report mg/1 mg/1 mg/1 mg/1 5 X Weekly 5X Weekly 2X Weekly 1 X Weekly Continuous 24-Hr. Comp. 3 Grabs/ 24Hrs 24-Hr. Comp. 24-lir. Comp. Lead [3] 6.1 Zinc [3] Report Mercury [3][5][13] Final 0.00031 Interim Discharge Limit [10]

------ Ammonia (as N) Report Fluoride Report Total Residual Chlorine !12] 1.9 Temperature [2]

----------- Whole Eftluent Toxicity 12 Report
0.00075 Report Report 4.2 [6]

Quality or Concentraticm
Parameter pH Daily D:,:ly Minimum :Y!aximum

6.0 9.0 lbs/day 0.026 lbs/day Report lbs/day 1.3 [14] lbs/day Report lbs/day Report lbs/day 8 0.052 Report

3.2 Report Report Report

18 ng/1 ng/1 mg/1 mg/1 ug/1 Bi-Monthly [8] Grab Bi-Monthly [8] Grab 1 X Weekly 24-Hr. Comp. 1X Weekly 24-J-lr. Comp. Daily [7] Grab

----------- ---------- Report °F 2 X Weekly 6 Grab.o/,

**~-Hrs.** See Partl.L., Biomonitoring Requirements

Units s.u. Table 2 Quarterly 24-Hr. Comp.
Monitoring Requirements Measurement Sample Frequency Ivru< 1 X Weekly Grab
[1] The permittee shall measure on the same day and atthe same time and report Outfalls 028 and 030 separately and also report as a combinedtotal (Outfall 600). [2] See Part III.A. ofthe permit for the Temperature Requirements. [3] The permittee shall measure and report identified metals as total recoverable metals. [4] Additional monitoring andreporting requirements are containedinPart 1.0., Visible Oil Corrective Action Monitoring Program.Page 27 of 139 PermitNo. IN00002Sl [5] The permittee applied for, and received, a variance from the water quality criterion used to establishthe referenced mercury WQBELs under the streamlinedmercury variance (SMV) procedures of327 lAC 5-3.5. Compliance with the interim discharge limitwill demonstrate compliance with this permit. See Part IV ofthe permit for additional requirements related to the SMV. [6] Compliance withthe daily maximum mass value will be demonstrated ifthe calculated mass value is less than 14.1 lbs/day. [7] Monitoring for TRC shall be 1 X Daily during zebra or quagga mussel intake chlorination, and continue for three additional days after zebra or quagga mussel treatment has completed. See Part I.P. for Zebra and QuaggaMussel Control and Chlorination for additional requirements. [8] Bi-monthly monitoring shall be conducted inthe months ofFebruary, April, June, August, October, and December ofeachyear. [9] See the Fact Sheet for the water treatment additives in use at Outfall 028/030 that have been reviewed and are approved for use at this facility by the Commissioner. Inthe eventthat changes are to be made inthe use ofwater treatment additives including dosage rates contributing to Outfall 028/030, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required in Part II.C.1 ofthis permit. The use ofany new or changed water treatment additives or dosage rates shall not causethe discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity information mustbe provided with any notification regarding any new or changed water treatment additives or dosage rates. [10] Forthe term ofthe NPDES permit, the permittee is subjectto the interim discharge limit developed under the provisions of327 lAC 5-3.5-8. Each reporting period (i.e., bi-monthly), the permittee shall report both a daily maximum value and an annual average value for mercury. The annual average value shall be calculated as the average ofall daily values from the mostrecent twelve-monthperiod. Reporting ofthe annual average value for mercury is not required during the first year ofthe permitterm. Compliance withthe interim discharge limitwill be achieved when the average ofdaily values measured over the mostrecent (rolling) twelve-monthperiod is less thanthe interim discharge limit. [11] See Part LB. ofthe permit for the Narrative Water Quality Standards. [12] See Part I.G. ofthe permit for Pollutant Minimization Requirements. [13] The following EPA test methods and/or Standard Methods and associated LODs and LOQs are to be used inthe analysis ofthe effluent samples. Alternative methods may be used iffirst approved by IDEM.Parameter Mercury [14] Outfall 028:

Outfall 030: EPAMethod 1631, Revision E LOD 0.2 ng/1 Page 28 of 139 PermitNo. IN0000281
LOQ 0.5 ng/1
2.8 ng/1 Annual average for the purpose ofthe mercury interim discharge limit.
3.0 ng/1 Annual average for the purpose ofthe mercury interim discharge limit.Parameter
Flow Lead [2] Zinc [2] Page 29 of 139 PermitNo. IN0000281 16. During the periodbeginning on the effective date ofthispermit, the permittee is authorized to discharge BOP (I-BOP and Q-BOP) treatment, vacuum degasser and continuous casting (1-Caster, 2-CasterAlB line, and 2-Caster C Line) treatment wastewaterthrough Outfall 603 to the Grand Calumet River via Outfall 028/030. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative of the discharge but priorto commingling with any other process or nonprocess waters. Such discharge shall be limited and monitored by the permittee as specified below:

Quantity orLoading Monthly Daily Average MaximumDISCHARGE LIMITATIONS [1] Internal Outfall 603 Quality or Concentration Monthly Daily Units Average Maximum Report Report 11.88 Report MGD Report lbs/day Report Report 36.38 lbs/day Report Report Report Report mg/1 mg/1 Monitoring Requirements Measurement Sample Frequency**~** Daily Continuous 2 X Weekly[3] 24-Hr. Comp. 2 X Weekly[3] 24-Hr. Comp.
[1] Samples taken in compliance withthe monitoring requirements above shall be taken at apoint representative ofthe discharge but priorto entry into Outfalls 028/030. Separate samples and flow measurements shall be taken at the discharge ofthe No.1 Continuous Caster Scale Pit, the filtered blowdown from the No.2 Continuous Caster, and the discharge ofthe No.1 andNo.lA BOP Thickeners. The mass loadings from eachmonitoring point shall be calculated and added together to determine the daily and monthly average mass discharges. [2] The permittee shall measure and report identified metals as total recoverable metals. [3] Sampling at 603 for lead and zinc shall occur onthe same day and at approximately atthe same time as the sample taken at Outfalls 028 and 030.Parameter
Flow Oil & Grease Page 30 of 139 PermitNo. IN0000281 17. During the period beginning onthe effective date ofthis permit, the permittee is authorized to discharge miscellaneous non-contact cooling water, steam condensate, freeze protectionwater, and storm waterthrough Outfall 032 to the Grand Calumet River. Samples taken in compliance with the monitoring requirements below shall be taken at a point representative ofthe discharge butpriorto entry into the Grand Calumet River. Such discharge shall be limited and monitored by the permittee as specifiedbelow:

Quantity or Loading Monthly Daily DISCHARGE LIMITATIONS [3)[4) Outfall 032

Table 1 Quality or Concentration Monthly Daily Average Maximum Units Average Maximum Report Report MGD Monitoring Requirements Measurement Sample Frequency

**~**

Total Residual Chlorine [5] 0.020 0.045 [1] Report Jbs/day 8 lbs/day Report Report 18 Report mg/1 ug/1 mg/1 1 X Monthly 1 X Monthly Daily [2] Estimate Grab Grab Ammonia (as N) Report 1 X Weekly 24-Hr. Comp.

Parameter pH Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2 Monitoring Measurement Frequency 1 X Monthly [1] Compliance withthe daily maximum mass value will be demonstrated ifthe calculated mass value is less than 0.15 lbs/day. Requirements Sample Tvpe Grab

[2] Monitoring for TRC shall be 1 X Daily during zebra or quaggamussel intake chlorination, and continue for three additional days after zebra or quaggamussel treatmenthas completed. See Part I.P. for Zebra and. QuaggaMussel Control and Chlorination for additional requirements. [3] See the Fact Sheet for the watertreatment additives in use at Outfall 032 that have been reviewed and are approved for use atthis facility bythe Commissioner. In the eventthat changes are to be made in the use ofwatertreatment additives including dosage rates contributing to Outfall 032, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required inPart II.C.1 of this permit. The use ofany new or changed watertreatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity informationmust be provided with any notification regarding any new or changed water treatment additives or dosage rates. [4] See Part LB. ofthe permitfor the Narrative Water Quality Standards. [5] See Part I.G. ofthe permit for PollutantMinimization Requirements.Parameter Page 31 of139 PermitNo. IN0000281 18. During the period beginning onthe effective date ofthis permit, the permittee is authorized to discharge non-contact cooling water from sheet and tin mills and the atmospheric gas plant, non-process wastewater from Railroad Kirk Yard, steam condensate, and storm waterthrough Outfall 033 to the Grand Calumet River. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative of the discharge butpriorto entry into the Grand Calumet River. Such discharge shall be limited and monitored bythe permittee as specified below:

Quantity orLoading Monthly Daily DISCHARGE LIMITATIONS [1][5][6] Outfall 033

Table 1 Quality or Concentration Monthly Daily Average Maximum Units Average Maximum Monitoring Requirements Measurement Sample Freguency IYill;_
Flow Report Report MGD 1 X Monthly 1 X Monthly 1 X Monthly 2 X Monthly Daily [4] Estimate Grab Oil & Grease [2] Phenols (4AAP) lbs/day Ammonia (as N) Report Report Report 0.030 [3] lbs/day Report Report Report Report mg/1 mg/1 mg/1 ug/1 24-Hr. Comp. 24-Hr. Comp. Grab Total Residual Chlorine [7] 0.013 lbs/day 8 18

Parameter pH Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2 Monitoring Requirements Measurement Sample Frequency IYill;_ 1 X Monthly Grab
[1] There shall be no discharge ofprocess wastewaters through Outfall 033. [2] Additional monitoring andreporting requirements are contained in Part I.O., Visible Oil Corrective Action Monitoring Program. [3] Compliance withthe daily maximum mass value will be demonstrated ifthe calculated mass value is less than 0.1 lbs/day. [4] Monitoring for TRC shall be 1 X Daily during zebra or quagga mussel intake chlorination, and continue for three additional days after zebra or quaggamussel treatment has completed. See Part I.P. for Zebra and Quagga Mussel Control and Chlorination for additional requirements. [5] See the Fact Sheet for the watertreatment additives in use at Outfall 033 that have beenreviewed and are approved for use atthis facility by the Commissioner. In the eventthat changes are to be made in the use ofwater treatment additives including dosage rates contributing to Outfall 033, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required inPart II.C.1 of this permit. The use ofany new or changed water treatment additives or dosage rates shall not cause the discharge from any pem1itted outfall to exhibit chronic orPage 32 of 139 PermitNo. IN0000281
acute toxicity. Acute and chronic aquatic toxicity information must be provided with any notification regarding any new or changed watertreatment additives or dosage rates. [6] See Part LB. ofthe permitfor the Narrative Water Quality Standards. [7] See Part I.G. ofthe permit for Pollutant Minimization Requirements.Parameter
Flow CBOD5 [4]

Summer Winter Oil & Grease [5] Total Suspended Solids Ammonia (as N) Lead [8] Zinc [8] Copper [8] Cadmium [8] Nickel [8] Silver [8] Total Chromium [8] Mercury [8][11][17] Final Page 33 of 139 PermitNo. IN0000281 19. During the periodbeginning onthe effective date ofthis permit, the permitteeis authorized to discharge treated wastewater from Internal Outfalls, 604, 605, and 606, non-contact cooling water from the finishing operations, non-contact cooling water from the ferrous chloride recycling discharge, steam condensate, and storm water runoffthrough Outfall 034 tothe Grand CalumetRiver. Samples taken incompliance withthe monitoring requirements below shall be taken at a pointrepresentative of the discharge butpriorto entry into the Grand CalumetRiver. Such discharge shall be limited and monitoredby the permittee as specified below:
DISCHARGE LIMITATIONS [1][2][6][10][13] Outfall 034

Table 1 Quantity orLoading Quality orConcentration Monitoring Requirements Monthly Daily Monthly Daily Measurement Sample Average Maximum Units Average Maximum Frequency

**~** Report Report MGD Daily Continuous 1,334 2,669 lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. 4,537 9,074 lbs/day Report Report mg/1 2XWeekly 24-Hr. Comp. 1,430 3,660 lbs/day Report Report mg/1 5 X Weekly 3 Grabs/ 24Hrs. Report Report lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. Report Report lbs/day Report Report mg/1 2XWeekly 24-Hr. Comp. 2.52 5.85 lbs/day Report Report mg/1 2XWeekly 24-Hr. Comp. Report Report lbs/day Report Report mg/1 2XWeekly 24-Hr. Comp. 3.8 8.7 lbs/day 0.018 0.041 mg/1 2 X Weekly 24-Hr. Comp. 2.3 3.4 lbs/day 0.011 0.016 mg/1 1 X Monthly 24-Hr. Comp. Report Report lbs/day Report Report mg/1 1 X Quarterly[l5] 24-Hr. Comp. 0.042 0.072 lbs/day 0.20 0.34 ug/1 2XMonthly 24-Hr. Comp. Report Report lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp.

0.00028 0.00068 lbs/day 1.3 3.2 ng/1 Bi-Monthly [14] Grab InterimDischarge Limit [12] 

### ------ 2.5 [18] Report ng/1 Bi-Monthly [14] Grab Phenols (4AAP) 26.00 39.00 lbs/day Report Report mg/1 1 X Weekly 24-Hr. Comp. Total Residual Chlorine 1.7 3.8 [9] lbs/day 8 18 ug/1 See Footnote [7] Grab Temperature [3] 

### ----------- ----------- ----------- 

### ---------- Report OF 2 X Weekly 6 Grabs/24-Hrs. Whole Effluent Toxicity [16]

------ 3.6 TUc Quarterly [15] 24-Hr. Comp.

Parameter pH Dissolved Oxygen [1]

[2] [3] Table 2 Quality or Concentration Monitoring Requirements Daily Daily Measurement Minimum Maximum Units Frequency

6.0 9.0 s.u. 1X Daily 5.0 mg/1 1 X Weekly

The permittee shall only discharge the effluents from Internal Outfalls 604, 605, and 606 through Outfall 034.
The permittee shall monitor Outfalls 034, 604, 605, and 606 onthe same days.
See PartIII.A. ofthepermitfor the Temperature Requirements. Sample

**~** Grab GrabPage 34 of 139 PermitNo. IN0000281 [4] Summer limitations apply from July 1through September 30. Winter limitations apply from October 1through June 30. [5] Additional monitoring and reporting requirements are contained inPart I.O., Visible Oil Corrective ActionMonitoring Program. [6] The following wastewatertreatment systems may be added to reduce the CBOD5 ona continuous year-round basis: (i) Internal Outfall604- Chlorination (sodiumhypochlorite) treatment. (ii) Internal Outfall605- Chlorination (sodium hypochlorite) treatment. (iii) Outfall 034- Sodium Bisulfite addition (de-chlorination). [7] Continuous chlorination at the above outfalls is permitted on a year-roundbasis. The wastewater shall be de-chlorinated priorto discharge from Outfall 034. Monitoring for TRC shall be daily during zebra or quaggamussel intake chlorination, and 2 X Weekly during continuous chlorinationtreatment whenthe intake is notbeingtreated for zebramussels. See Part I.P. for Zebra and Quagga Mussel Control and Chlorination for additional requirements. [8] Thepermittee shall measure and report identified metals as total recoverable metals. [9] Compliance with the daily maximummass value will be demonstrated ifthe calculatedmass value is less than 12.7lbs/day. [10] See Part LB. ofthepermitfor the Narrative Water Quality Standards. [11] The permittee applied for, and received, a variance from the water quality criterion used to establishthe referenced mercury WQBELs underthe streamlinedmercury variance (SMV) procedures of327 lAC 5-3.5. Compliance withthe interim discharge limitwill demonstrate compliance withthis permit. See Part IV ofthe permit for additional requirements related to the SMV. [12] Fortheterm ofthe NPDES permit, the permittee is subjectto the interim discharge limit developed underthe provisions of327 lAC 5-3.5-8. Each reporting period (i.e., bi-monthly), the permittee shall reportboth a daily maximumvalue and an annual average value for mercury. The annual average value shall be calculated as the average ofall daily values from the mostrecent twelve-monthperiod. Reporting ofthe annual average value for mercury is not required during the first year ofthe permitterm. Compliance withthe interim discharge limit will be achieved whenthe average ofdaily values measured over the mostrecent (rolling) twelve-monthperiod is less thanthe interim discharge limit.Page 35 of 139 PermitNo. IN0000281
[13] See the Fact Sheet for the water treatment additives in use at Outfall 034 that have beenreviewed and are approved for use at this facility bythe Commissioner. In the eventthat changes are to be made inthe use ofwatertreatment additives including dosage rates contributing to Outfall 034, the permittee shall notifY the Indiana Department ofEnvironmental Management as required in Part ILC.1 of this permit. The use ofany new or changed water treatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity information must be provided with any notit!cation regarding any new or changed watertreatment additives or dosage rates. [14] Bi-monthly monitoring shall be conducted inthe months ofFebruary, April, June, August, October, and December ofeach year. [15] Samples shall betaken once at any time during each ofthe four annual quarters: (A) January-February-March; (B) April-May-June; (C) July-August-September; and (D) October-November-December.
For quarterly monitoring, in the first quarter for example, the permittee may conduct sampling within the month ofJanuary, February or March. The result from this reporting timeframe shall bereported onthe March DMR, regardless of which ofthe months withinthe quarter the sample was taken. [16] See Part LL. ofthe permit for Biomonitoring Requirements. [17] The following EPA test methods and/or Standard Methods and associated LODs and LOQs are to beused in the analysis ofthe effluent samples. Alternative methods may beused iffirst approved byIDEM.
Parameter Mercury EPA Method 1631, Revision E LOD 0.2 ng/1 

### LOQ 0.5 ng/1 [18] Annual average for the purpose ofthe mercury interim discharge limit.Parameter
Flow Page 36 of 139 PermitNo. IN0000281 20. During the periodbeginning onthe effective date ofthis pennit, the permittee is authorized to discharge treatedprocess wastewaters from cold rolling, acid pickling, alkaline cleaning, hot coating, electroplating, and hot strip mill oil cellars through Internal Outfall 604 to the Grand Calumet River via Outfall 034. Samples taken incompliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butpriorto commingling with any otherprocess ornon-process waters. Such discharge shall be limited and monitored by the permittee as specified below:
DISCHARGE LIMITATIONS [1][2] Outfall604 Quantity or Loading Quality or Concentration Monitoring Requirements Monthly Daily Monthly Daily Measurement Sample Average Maximum Units Average Maximum Units Frequency

**~** Report Report MGD Daily Continuous Total Suspended Solids 2,901 6,455 lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. Oil & Grease Report Report lbs/day Report Report mg/1 5 X Weekly 3 Grabs/ 24 Hrs. Total

**Recov~rable** Chromium[4] 28.25 45.77 lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. Zinc [4] 33.42 70.00 lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. Lead [4] Report Report lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. Total Cyanide [3] 10.74 19.83 lbs/day Report Report mg/1 1 X Quarterly [7] See Part I.Q. Cadmium [4] Report Report lbs/day Report Report mg/1 1 X Quarterly [7] 24-Hr. Comp. Hexavalent Chromium [6][8] 0.15 0.46 lbs/day Report Report mg/1 1 X Weekly Grab Copper [4] Nickel [4] Silver [4] TTO [5] Naphthalene Tetrachloroethylene Report Report lbs/day Report Report mg/1 2 X Weekly 24-Hr. Comp. 39.32 65.76 lbs/day Report Report mg/1 1 X Quarterly [7] 24-Hr. Comp. Report Report lbs/day Report Report mg/1 2 X Monthly 35.19 lbs/day 1 X Monthly

1.68 lbs/day Report mg/1 2XWeekly 2.51 lbs/day Report mg/1 2 X Weekly [1] Bypasses ofprocess wastewaters from the above sources around the Terminal Treatment Plant are permiHed only in accordance with Section B.2., Part II ofthis permit. Thepermittee shall not use cyanideplating solutions in any metal finishing operations, unless expressly authorized by a modification ofthis permit. [2] Samples taken in accordance with the monitoring requirements above shall be taken at a point representative ofthe discharge but priorto entry into Outfall 034. [3] Cyanide shall be measured and reported as Total Cyanide. See Part LQ. for additional requirements. [ 4] The permittee shall measure and reportthe identified metals a total recoverable metals. [5] The limitation for TTO (Total Toxic Organics) applies to the summation ofall quantifiable values greater than 0.01 mg/1 for alltoxic organics listed under 40 CFR433.11(e) which are reasonably expected to be present. This is a federal effluent guideline based limitation and is not an authorizationto discharge toxic organic compounds at levels which cause ormay cause water quality violations. 24-Hr. Comp. 24-Hr. Comp. 24-Hr. Comp. 2 Grabs/ 24 Hrs.Page 37 of 139 PermitNo. IN0000281 The discharge oforganic compounds at level which cause ormay cause water quality violations is prohibited. The intent ofthis limitation is to assure that any solvent or otherproducts in use atthe plant, which contain any ofthe listed toxic organic compounds, are disposed ofproperly, and not dumped, spilled, discharged orleaked.
Certification Statement
In lieu ofmonthly monitoring for TTO, theparty responsible for signing the monthly discharge monitoring report (DMR) forms may makethe following statement, as part ofthe DMR: "Basedonmyinquiry ofthe persons directly responsible for managing compliance withthe permit limitations for TTO, I certifythat, to the best ofmyknowledge and belief, no disposal ofconcentrated toxic organics into the wastewaters has occurred since filing ofthe last discharge monitoring report. I further certify thatthis facility is implementingthe Toxic Organic Pollutant Management Plan submittedto the Compliance Evaluation Section ofthe Office ofWater Quality, as required by this permit." The Certification Statementmay notbe used until completion ofthe Toxic Organic Pollutant Management Planrequired by Part LN. ofthis permit.
Ifthe above mentionedresponsible party is unable to makethe above Certification Statementbecause ofdischarge or spills ofany TTO compounds, the Permittee is required to notify IDEM in accordance with Part II.C.3 ofthis permit. [6] Hexavalent Chromium shall be measured and reported as dissolved metal. The Hexavalent Chromium sample type shall be grab method. The maximumholding time for a Hexavalent Chromium sample is 24 hours (40 CFR 136.6 Table IB). Therefore, the grab sample mustbe analyzed within 24 hours. [7] Samples shall betaken once at any time during each ofthe four annual quarters: (A) January-February-March; (B) April-May-June; (C) July-August-September; and (D) October-November-December.
For quarterly monitoring, in the first quarter for example, the permittee may conduct sampling withinthe month ofJanuary, February orMarch. The result from this reporting timeframe shall be reported on the March DMR, regardless of which ofthe months withinthe quarterthe sample was taken. [8] Forpurposes ofcalculating the monthly average mass, loadings to be reported on the DMRforms, concentrationvalues belowthe limit ofquantitation (LOQ) of 0.94 ug/1 maybe assigned a value ofzero for purposes ofcalculatingthe monthly average mass limit.Parameter
Flow Page 38 of 139 PermitNo. IN0000281 21. During the periodbeginning onthe effective date ofthis permit, the permittee is authorized to discharge treatedprocess wastewaters from the 84" Hot Strip Mill through Internal Outfall 605 to the Grand Calumet River via Outfall 034. Samples taken incompliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butpriorto commingling with any otherprocess or non-process waters. Such discharge shall be limited and monitored by the permittee as specified below:

Quantity or Loading Monthly Daily Average MaximumDISCHARGE LIMITATIONS [1] Outfall605 Quality or Concentration Monthly Daily Average Maximum
MGD Monitoring Measurement Frequency Daily Total Suspended Solids Oil & Grease Report 725 Report Report 2,175 1,450 lbs/day Report lbs/day Report Report mg/1 mg/1 2 X Weekly 5 X Weekly [1] The permittee may discharge process wastewater from the 84" Hot Strip Mill only through Outfall605, and oil cellar discharges through Outfal1604 (Terminal Treatment Plant). Non-contact cooling water from the 84" Hot Strip Mill shall only be discharged through Outfall 039. Requirements Sample

**~** Continuous 24-Hr. Comp. 3 Grab/ 24-HrsParameter
Flow Oil & Grease Total Chromium Zinc [4] Lead [4] Phenols (4AAP) Page 39 of 139 PermitNo. IN0000281 22. During the period beginning onthe effective date ofthis permit, the permittee is authorized to discharge non-contact cooling water from steel finishing operations, miscellaneous non-process wastewater, and storm water runoffthrough Internal Outfall 606 to the Grand Calumet River via Outfall 034. Samples taken in compliance with the monitoring requirements below shall be taken at a point representative ofthe discharge butpriorto commingling with otherprocess or non-process waters. Such discharge shall be limited and monitored by the permittee as specified below:

Quantity or Loading Monthly Daily DISCHARGE LIMITATIONS [1][2][3] Outfall606 Quality or Concentration Monthly Daily Average Maximum Units Average Maximum Report Report MGD Report Report Report Report Report Monitoring Measurement Units Freguency Daily mg/1 1 X Weekly mg/1 1 X Monthly mg/1 l X Monthly mg/1 1 X Monthly mg/1 1 X Monthly [1] The permittee may discharge non-process wastewaters associated with steel finishing operations viathe 84" X 91" sewer to the final oil skimming basin at Outfall 034 for treatment prior to discharge through Outfall 034. [2] The permittee shall monitor Outfall 606 for oil and grease, total chromium, lead, zinc, andphenols ( 4AAP) on the same days thatmonitoring for Outfalls 034, 604 and 605 occurs. [3] Corrective action will be initiated after an investigation ofany reported discharges ofprocess wastewaters discharging from Outfall 606. [ 4] The permittee shall measure and report the identified metals as total recoverable metals. Requirements Sample**~** 24-Hr. Total

Grab 24-Hr. Comp. 24-Hr. Comp. 24-Hr. Comp. 24-Hr. Comp.Parameter Page 40 of 139 PermitNo. IN0000281 23. During the periodbeginning onthe effective date ofthis permit, the pe1mittee is authorizedto discharge north blast furnace non-contact cooling water, No. 5 electric power station non-contact cooling water, CoGeneration Plant non-contact cooling water, steam condensate, and storm water runoffthrough Outfall 035 to Lake Michigan. Samples taken in compliance with the monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butpriorto entry into Lake Michigan. Such discharge shall be limited and monitored by the pennittee as specified below:
DISCHARGE LIMITATIONS [1][6][7][10][11] Outfall 035

Table 1 Quantity orLoading Quality or Concentration Monthly Daily Monthly Daily Average Maximum Units Average Maximum Monitoring Measurement Units Frequency
Flow Report Report MGD Daily Oil & Grease [2) [13) Report mg/1 1 X Weekly Temperature [3]

Discharge Intake [4] Thermal Discharge See Footnote [5] for Effluent Limitations Report Report OF I X Hour op 1 X Hour BTU/Hr Daily Total Residual Chlorine [9][12) 10 24 [8] lbs/day 8 18 ug/1 Daily

Parameter pH Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2 Monitoring Measurement Frequency 1 X Monthly [1] The permittee may discharge non-contact cooling waters from blastfurnace and sintering operations only through Outfalls 015, 018, 019, and 035. [2] Additional monitoring and reporting requirements are contained inPart I.O., Visible Oil Corrective Action Monitoring Program. [3] See Part III.A.2. for additional temperature requirements. [4] The permittee shall continuously monitor intake temperature at the No.2 Pump Station. [5] The effluent limitation is 1.211 billion BTU/hour as a maximum daily average. Monitoring shall include flow and intake and outlettemperatures as measured across the condensers onthe continuous basis. The daily average BTU's/hour shall be calculated as follows: the BTU's/hour shall be determined once each hour and those volumes shall be averaged over a 24 ourperiod for each day. [6] There shall be no discharge ofblast furnace or sinter plant process wastewaters or process wastewaterresiduals through Outfall 035. Requirements San1ple

**~** Continuous Grab
Continuous Continuous Continuous

Grab
Requirements Sample

**~** GrabPage41 of139 PermitNo. IN0000281 [7] The permittee is prohibited from undertaking any deliberate action that would result in a degradation ofwater quality ofthe OSRW, unless the action complies with the applicable provisions of327 lAC 5-2-11.7. In addition, whether or not this permit contains a limitation for a BCC, the permittee shall monitor for any BCC known or believed to be present in the discharge, from any point or nonpoint source over which the permittee has control. Ifthere is an increase in loading ofa BCC, above nonnal variability and attributable to a deliberate action, the permittee shall immediately notify IDEM ofthe increase. IfIDEM determines the increased discharge ofthe BCC does not qualify under one ofthe exceptions under 327 lAC 5-2-11.7(b) or (c) and is attributable to a deliberate action ofthe permittee, the pem1ittee shall eliminate the increase. [8] Compliance withthe daily maximum mass value will be demonstrated ifthe calculated mass value is less than 78.5 lbs/day. [9] Monitoring for TRC shall be 1 X Daily during zebra or quagga mussel intake chlorination, and continue for three additional days after zebra or quagga mussel treatment has been completed. See Part I.P. for Zebra and Quagga Mussel Control and Chlorination for additional requirements. [10] See the Fact Sheet for the water treatment additives in use at Outfall 035 that have been reviewed and are approved for use at this facility by the Commissioner. In the event that changes are to be made inthe use ofwatertreatment additives including dosage rates contributing to Outfall 035, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required inPart II.C.1 of this permit. The use ofany new or changed water treatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity informationmustbe provided with any notificationregarding any new or changed watertreatment additives or dosage rates. [11] See PartLB. ofthepermit for the Narrative Water Quality Standards. [12] See Part I.G. ofthe permit for Pollutant Minimization Requirements. [13] Ifoil and grease is measured in the effluent in significant quantities, the source ofsuch discharge is to be investigated and eliminated. The facility is required to investigate and eliminate any significant ormeasured concentration ofoil and grease (quantities in excess of5 mg/1). The intent ofthis requirement is to assure that oil and grease is not added to once-through cooling water in measurable quantities (5 mg/1).Page 42 of 139 PermitNo. IN0000281 24. During the period beginning on the effective date ofthis permit, the permittee is authorized to discharge non-contact cooling water from the 5- Stand Cold ReductionMill, North Sheet Mill Annealing, the No. 6 and 8 Galvanized lines, air compressornon-contact cooling water, steam condensate, and storm water runoffthrough Outfall 037to Lake Michigan. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butprior to entry into Lake Michigan. Such discharge shall be limited and monitored bythe permittee as specified below:
DISCHARGE LIMITATIONS [1][7][8][9] Outfall 037

Table 1 Quantity orLoading Quality or Concentration Monitoring Requirements Monthly Daily Monthly Daily Measurement Sample Parameter Average Maximum Average Maximum Frequency

**~** Flow

Interim Final [6] Temperature

Discharge

Interim Final [6] Intake Report Report Report Report MGD MGD 1 X Weekly Daily

Report oF 1 X Week Report oF 1 X Hour Report oF 1 X Hour Thennal Discharge [6] Oil & Grease [2] [11] Zinc [3] Report Report 0.45 [4] lbs/day lbs/day Report Report Report BTU/Hr Daily mg/1 1 X Weekly mg/1 1 X Monthly Phenols (4AAP) Report mg/1 1 X Monthly Total Residual Chlorine [10] 0.20 lbs/day 8 18 ug/1 Daily [5]

Parameter pH Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2

[1] There shall be no discharge ofprocess wastewater through Outfall 037. Monitoring Measurement Frequency 1 X Monthly

[2] Additional monitoring and reporting requirements are contained in Part LO., Visible Oil Corrective Action Monitoring Program. [3] The permittee shall measure and report the identifiedmetals as total recoverable metals. [4] Compliilllce withthe daily maximum mass value will be demonstrated ifthe calculated mass value is less than 1.5 lbs/day. [5] Monitoring for TRC shall be 1 X Daily during zebra or quaggamussel intake chlorination, and continue for three additional days after zebra or quaggamussel treatmenthas been completed. See Part I.P. for Zebra and Quagga Mussel Control and Chlorination for additional requirements. Estimate Continuous

Grab Continuous Continuous Continuous Grab 24-Hr. Comp. 24-Hr. Comp.

Grab
Requirements Sarl1ple Tyoe GrabPage 43 of 139 PermitNo. IN0000281
[6] See Part III.A.2. and A.3. for additional temperature requirements and compliance schedule for continuous monitoring requirements for temperature and flow. [7] See the Fact Sheet for the water treatment additives in use at Outfall 037 that have beenreviewed and are approved for use at this facility by the Commissioner. In the eventthat changes areto be made inthe use ofwater treatment additives including dosage rates contributing to Outfall 037, the permittee shall notify the IndianaDepartment ofEnvironmental Management as required in Part II.C.1 of this permit. The use ofany new or changed water treatment additives ordosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity information mustbe provided with any notificationregarding any new or changed water treatment additives or dosage rates. [8] The permittee is prohibited from undertaking any deliberate action that would result in a degradation ofwater quality ofthe OSRW, unless the action complies withthe applicable provisions of327 lAC 5-2-11.7. In addition, whether or not this permit contains a limitation for a BCC, the permittee shall monitor for any BCC known or believed to be present in the discharge, from any point ornonpoint source over which the permittee has control. Ifthere is an increase in loading ofa BCC, above normal variability and attributable to a deliberate action, the permittee shall immediately notify IDEM ofthe increase. IfIDEM determines the increased discharge ofthe BCC does not qualify under one ofthe exceptions under 327 lAC 5-2-11.7(b) or (c) and is attributable to a deliberate action ofthe permittee, the permittee shall eliminate the increase. [9] See Part LB. ofthe permit for the Narrative Water Quality Standards. [10] See Part I.G. ofthe permit for Pollutant Minimization Requirements. [11] Ifoil and grease is measured in the effluent in significant quantities, the source ofsuch discharge is to be investigated and eliminated. The facility is required to investigate and eliminate any significant or measured concentration ofoil and grease (quantities in excess of5 mg/1). The intent ofthis requirement is to assure that oil and grease is not added to once-through cooling water inmeasurable quantities (5 mg/1).Page 44 of 139 PermitNo. IN0000281 25. During the period beginning on the effective date ofthis permit, the permittee is authorized to discharge non-contact cooling water from the 84" Hot Strip Mill, non-contact cooling water from the reheat furnaces, emergency overflows from the 84" Hot Strip Mill roughing mill scale pit, steam condensate, non-contact cooling water from a cooling tower and storm water through Outfall 039 to Lake Michigan. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge butprior to entry into Lake Michigan. Such discharge shall be limited and monitored by the permittee as specified below:
DISCHARGE LIMITATIONS [1][5][6][7] Outfall 039
Table 1 Quantity orLoading Quality or Concentration Monitoring Requirements Monthly Daily Monthly Daily Measurement Sample Parameter Flow

Interim Final [4] Temperature Average Maximum Units Average Maximum Frequency

**~**

Discharge

Interim Final [4] Intake [4] Report Report Report Report MGD MGD

Report Report Report OF OF OF l X Weekly Daily

l X Week I X Hour l X Hour Them1al Discharge [4] Oil & Grease [9] Report Report BTU/Hr Daily mg/1 1 X Weekly Total Residual Chlorine [S] 3.7 8.3 [2] lbs/day 8 18 ug/1 Daily [3]

Parameter pH Table 2 Quality or Concentration Monitoring Daily Daily Measurement Minimum Maximum Units Frequency

6.0 9.0 s.u. 1X Monthly
[1] There shall be no discharge ofprocess wastewater through Outfall 039, except as provided for byPart II.B.1., 2. and 3. [2] Compliance withthe daily maximum mass value will be demonstrated ifthe calculated mass value is less than 27.5 lbs/day. [3] Monitoring for TRC shall be 1 X Daily during zebra or quagga mussel intake chlorination, and continue for three additional days after zebra or quagga mussel treatment has completed. See Part I.P. for Zebra and QuaggaMussel Control and Chlorination for additional requirements. [4] See Part III.A.2. and A.3. for additional temperature requirements and compliance schedule for continuous monitoring requirements for temperature and flow. [5] See the Fact Sheet for the watertreatment additives inuse at Outfall 039 thathave beenreviewed and are approved for use at this facility by the Commissioner. In Estimate Continuous

Grab Continuous Continuous Continuous Grab Grab
Requirements Sample Tvpe GrahPage 45 of 139 PermitNo. IN0000281 the event that changes are to be made in the use ofwatertreatment additives including dosage rates contributingto Outfall 039, the permittee shall notify the Indiana Department ofEnvironmental Management as required in Part II.C.l of this permit. The use ofany new or changedwater treatment additives or dosage rates shall not cause the discharge from any permitted outfall to exhibit chronic or acute toxicity. Acute and chronic aquatic toxicity informationmust be provided with any notification regarding any new or changed watertreatment additives or dosage rates. [6] The permittee is prohibited from undertaking any deliberate actionthatwould result in a degradation ofwater quality ofthe OSRW, unless the action complies with the applicable provisions of327 lAC 5-2-11.7. In addition, whether or not this permit contains a limitation for a BCC, the permittee shall monitor for any BCC known orbelieved to be present in the discharge, from any point ornonpoint source over which the permittee has control. Ifthere is an increase in loading ofa BCC, above normal variability and attributable to a deliberate action, the permittee shall immediately notify IDEM ofthe increase. IfiDEM determines the increased discharge ofthe BCC does not qualify under one ofthe exceptions under 327 lAC 5-2-11.7(b) or (c) and is attributable to a deliberate action ofthe permittee, the permittee shall eliminate the increase. [7] See Part LB. ofthe permit for the Narrative Water Quality Standards. [8] See Part I.G. ofthe permit for Pollutant Minimization Requirements. [9] Ifoil and grease is measured inthe effluent in significant quantities, the source ofsuch discharge is to be investigated and eliminated. The facility is required to investigate and eliminate any significant or measured concentration ofoil and grease (quantities in excess of5 mg/1). The intent ofthis requirement is to assure that oil and grease is not added to once-through cooling water in measurable quantities (5 mg/1).Parameter
Flow Oil & Grease Page 46 of 139 PennitNo. IN0000281 27. During the periodbeginning onthe effective date ofthis permit, the permittee is authorizedto discharge non-contact cooling water from the ore yardrectifier system through Outfall(s) 041A and 041B to Lake Michigan. Samples taken in compliance withthe monitoring requirements below shall be taken at a pointrepresentative ofthe discharge but prior to entry into the boat slip atLake Michigan. Such discharge shall be limited and monitored by the permittee as specified below:

Quantity orLoading Monthly Daily DISCHARGE LIMITATIONS [1][2] Outfall 041A & 041B Quality or Concentration Monthly Daily Average Maximum Units Average Maximum Report Report MGD Monitoring Measurement Frequency
1X Monthly 1 X Monthly Total Residual Chlorine [4][5] 0.0057 0.013 [6] Report Report Jbs/day 8 lbs/day Report Repmi 18 Report mg/1 ug/1 mg/1 Daily Zinc [3] Report
Quality or Concentration Daily Daily Minimum Maximum

6.0 9.0 Units s.u. Table 2

[1] See Part LB. ofthe permitfor the Narrative Water Quality Standards. 1 X Monthly
Monitoring Measurement Frequencv 1 X Monthly

[2] The permittee is prohibited from undertaking any deliberate actionthat would result in a degradation ofwater quality ofthe OSRW, unless the action complies withthe applicable provisions of327 lAC 5-2-11.7. In addition, whether ornot this permit contains a limitation for a BCC, the permittee shall monitor for any BCC known or believed to be present in the discharge, from any point or nonpoint source over which the permittee has controL Ifthere

**i~;** an increase in loading ofa BCC, above normal variability and attributable to a deliberate action, the permittee shall immediately notify IDEM ofthe increase. !fiDEMdetermines the increased discharge ofthe BCC does not qualify under one ofthe exceptions under 327 lAC 5-2-11.7(b) or (c) and is attributable to a deliberate action ofthe permittee, the permittee shall eliminate the increase. [3] The permittee shall measure and report the identified metals as total recoverable metals.
[4] Monitoring for TRC shall be 1 X Daily during zebra or quaggamussel intake chlorination, and continue for three additional days after zebra or quagga mussel treatment has completed. See Part I.P. for Zebra and QuaggaMussel Control and Chlorination for additional requirements. [5] See Part I.G. ofthe permitfor Pollutant MinimizationRequirements. Requirements Sample

**~** Estimate Grab Grab Grab
Requirements Sample

**~** GrabParameter
Flow Page 47 of 139 Permit No. IN0000281 [6] Compliance with the daily maximum mass value will be demonstrated ifthe calculated mass value is less than 0.043 lbs/day.

28. During the periodbeginning on the effective date ofthis permit, the permittee is authorized to dissharge water intake screen backwashthrough Outfalls BW-1, BW-2, BW-3, BW-4, and BW-5 to Lake Michigan. Samples taken in compliance withthe monitoring requirements below shall be taken at a point representative ofthe discharge but prior to entry into the boat slip at Lake Michigan. Such discharge shall be limited and monitored by the permittee as specifiedbelow:

DISCHARGE LIMITATIONS [1][2][4] Quantity or Loading Quality or Concentration Monthly Daily Monthly Daily Average Maximum Units Average Maximum Report MGD Monitoring Requirements Measurement Sample Frequency**~** Quarterly [3] Estimate [1] Discharge ofwater intake screen backwash is authorized from the following Lake Michigan water intakes:
BW-1 -No. 1 service waterpumping station. BW-2- No.2 service water pumping station. BW-3- No.3 service waterpumping station. BW-4- No.4 service water pumping station. BW-5 Lakeside service waterpumping station. [2] There shall be no discharge ofprocess wastewaters from Outfalls BW-1, BW-2, BW-3, BW-4, and BW-5. [3] Samples shall be taken once at any time during each ofthe four annual quarters: (A) January-February-March; (B) April-May-June; (C) July-August-September; and (D) October-November-December.
For quarterly monitoring, in the first quarter for example, the permittee may conduct sampling within the month ofJanuary, February or March. The result from this reporting timeframe shall be reported onthe March DMR, regardless of which ofthe months withinthe quarter the sample was taken. [ 4] See Part I.B. ofthe permit for the Narrative Water Quality Standards.B. NARRATIVE WATER QUALITY STANDARDS Page 48 of 139 PermitNo. IN0000281

At all times the discharge from any and all point sources specified withinthis permit shall not cause receiving waters:
1. including the mixing zone, to contain substances, materials, floating debris, oil, scum, or otherpollutants:

a. that will settle to form putrescent or otherwise objectionable deposits;
b. that are in amounts sufficient to be unsightly or deleterious;

c. that produce color, visible oil sheen, odor, or otherconditions in such degree as to create a nuisance;
d. which are in amounts sufficientto be acutely toxic to , orto otherwise severely injure orkill aquatic life, other animals, plants, or humans;

e. which are in concentrations or combinations thatwill cause or contribute to the growth ofaquatic plants or algae to such a degree as to create a nuisance, be unsightly, or otherwise impairthe designated uses. 2. outside the mixing zone, to contain substances inconcentrations which on thebasis ofavailable scientific data are believedto be sufficientto injure, be chronically toxic to, orbe carcinogenic, mutagenic, or teratogenic to humans, animals, aquatic life, orplants.
C. MONITORINGAND REPORTING
1. Representative Sampling Samples and measurements taken as required herein shall be representative ofthe volume and nature ofthe discharge.
2. Discharge Monitoring Reports

a. Forparameters with monthly average water quality based effluent limitations (WQBELs) belowthe LOQ, daily effluentvalues that are less thanthe limit ofquantitation (LOQ) may be assigned a value ofzero (0).Page 49 of 139 PermitNo. IN0000281

b. For all otherparameters for whichthe monthly average WQBEL is equal to or greaterthanthe LOQ, calculations that require averaging ofmeasurements ofdaily values (both concentration and mass) shall use an arithmetic mean. When a daily discharge value is below the LOQ, a value ofzero (0) shall be used for thatvalue in the calculationto determine the monthly average unless otherwise specified or approved bythe Commissioner.

c. Effluent concentrations less thanthe LOD shall be reported on the Discharge Monitoring Report (DMR) forms as < (less than) the value ofthe LOD. For example, ifa substance is not detected at a concentration of0.1 flg/1, report the value as <0.1 flg/l.
d. Effluent concentrations greater than or equal to the LOD and less than the LOQ that are reported on a DMR shall be reported as the actual value and annotated on the DMRto indicate that the value is not quantifiable.

e. Mass discharge values which are calculated from concentrations reported as less than the value ofthe limit ofdetection shall be reported as less thanthe corresponding mass discharge value.
f. Mass discharge values that are calculated from effluent concentrations greaterthanthe limit ofdetection shall bereported as the calculatedvalue.
g. See Part III.E ofthe permit for additional reporting requirements for values belowthe limit ofquantitation (LOQ).
The permittee shall submit federal and state discharge monitoring reports to the Indiana Department ofEnvironmental Management containing results obtained during the previous month which shall be postmarkedno laterthan the 28th day ofthe month following each completed monitoring period. The first report shall be submitted bythe 28th day ofthe month following the month inwhichthe permitbecomes effective.
The Regional Administratormay request the permittee to submit monitoring reports to the Environmental Protection Agency ifit is deemed necessary to assure compliance with the permit.
3. Definitions

a. Monthly AveragePage 50 of 139 PennitNo. IN0000281 (1) Mass Basis

- The "monthly average" discharge means the total mass discharge during a calendar month divided by the number ofdays inthe monththatthe production or commercial facility was discharging. Where less than daily samples is required bythis permit, the monthly average discharge shall be determinedbythe summation ofthe measured daily mass discharges divided bythe number of days during the calendarmonth when the measurements were made. (2) ConcentrationBasis

- The "monthly average" concentration means the arithmetic average ofall daily determinations of concentrationmade during a calendar month. When grab samples are used, the daily determination ofconcentration shall be the arithmetic average (weightedby flow value) of all the samples collected during the calendar day.
b. "Daily Discharge" (1) Mass Basis -The "daily discharge" means the total mass discharge byweight during any calendar day. (2) ConcentrationBasis- The "daily discharge" means the average concentration overthe calendar day or any twentyfour (24) hourperiodthatreasonably represents the calendar day for thepurposes ofsampling.

c. "DailyMaximum" (1) Mass Basis- The "daily maximum" means the maximum daily discharge mass value for any calendar day. (2) ConcentrationBasis- The "dailymaximum" means the maximum daily discharge value for any calendar day. (3) Temperature Basis- The "dailymaximum" means the highesttemperature value measured for any calendar day.
d. A 24-hour composite sample consists ofat least 3 individual flowproportioned samples ofwastewater, taken bythe grab sample method orby an automatic sampler, which are taken at approximately equally spacedtime intervals for the duration ofthe discharge within a 24-hourperiod andwhich are combinedpriorto analysis. A flow-proportioned composite sample may be obtained by:Page 51 of 139 PermitNo. IN0000281

(1) recording the discharge flow rate at the time each individual sample is taken, (2) adding together the discharge flow rates recorded from each individuals samplingtime to formulate the "total flow" value, (3) the discharge flow rate ofeach individual sampling time is divided bythe total flow value to determine its percentage ofthe total flow value, (4) thenmultiplythe volume ofthe total composite sample by each individual sample's percentage to determine the volume ofthat individual sample whichwill be included in the total composite sample.

e. Concentration -The weight ofany given material present in a unit volume ofliquid. Unless otherwise indicated inthis permit, concentration values shall be expressed in milligrams per liter (mg/1).
f. The "Regional Administrator" is defined as the RegionV Administrator, U.S. EPA, located at 77 West Jackson Boulevard, Chicago, Illinois 60604.
g. The "Commissioner" is defined as the Commissioner ofthe IndianaDepartment ofEnvironmental Management, which is located at the following address: 100 North Senate Avenue, Indianapolis, Indiana46204.
h. "Limit ofDetection" or "LOD" means a measurement ofthe concentration ofa substance that canbe measured and repmied withninety-nine percent (99%) confidence thatthe analyte concentration is greaterthan zero (0) for a particular analytical method and sample matrix. The LOD is equivalentto the method detection level orMDL.

1. "Limit ofQuantitation" or "LOQ" means a measurement ofthe concentration ofa contaminant obtainedby using a specified laboratory procedure calibrated at a specified concentration above the method detection level. Itis considered the lowest concentration at which a particular contaminant canbe quantitatively measured using a specified laboratoryprocedure forPage 52 of 139 PermitNo. IN0000281
monitoring ofthe contaminant. This term is also sometimes called limit quantification or quantification level.
J. "MethodDetection Level" or "MDL" means the minimum concentration ofan analyte (substance) that can be measured and reported with a ninety-nine percent (99%) confidence that the analyte concentration is greaterthan zero (0) as determined by procedure set forth in 40 CFR 136, Appendix B. The method detection level orMDL is equivalentto the LOD.
4. Test Procedure
The analytical and sampling methods used shall conform to the current version of40 CFR 136. Multiple editions ofStandard Methods for the Examination ofWater and Wastewater are currently approved for most methods, however, 40 CFR Part 136 should be checkedto ascertain ifa particular method is approved for a particular analyte. The approved methods may be included inthe texts listed below. However, different but equivalent methods are allowable iftheyreceive the prior written approval ofthe Commissioner and the U.S. Environmental ProtectionAgency.

a. Standard Methods for the Examination ofWater and Wastewater 18th, 19th, or 20th Editions, 1992, 1995, or 1998, American Public Health Association, Washington, D.C. 20005.
b. A.S.T.M. Standards, Parts 23, Water; Atmosphere Analysis 1972 American Society for Testing and Materials, Philadelphia, PA 19103.

c. Methods for Chemical Analysis ofWater and Wastes June 1974, Revised, March 1983, Environmental Protection Agency, Water Quality Office, Analytical Quality Control Laboratory, 1014 Broadway, Cincinnati, OH 45202.
d. The following analytical methods and limits ofdetection and limits ofquantitation shall be used: Concentration (in ug/1)
Parameter [7] Method [1] LOD (LOQ or ML) SM 4500-NH3-G, 10 32 Ammonia EPA 350.1 (undistilled) SM 4500-NH3-G 50 160 (w/prep SM 4500-NH3-B)(distilled) Benzene EPA 624 Benzo(a)pyrene 610 HPLC [4] Benzo(a)pyrene 610-GC/MS [4] Cadmium 200.8 CBODs SM 5210B Chloride SM 4500 Cl E (Colorimetric Automated) EPA 300.0 (Anions by IC)

---- Copper 200.8 Cyanide, Total SM 4500-CN-E [2] (colorimetric) Cyanide, Free 4500-CN-I [2] Fluoride SM 4500-F-C (Ion Selective Mode) 300.0 Hex. Chrome 218.6 Lead 200.8 Mercury [6] 1631 Naphthalene 610 (HPLC) Naphthalene 610 MS, EPA625 Nickel 3113B 200.8 Oil and Grease 1664 Phenols 420.4 Selenium 200.8 Silver 200.8 Sulfate 300.0 Tetrachloroethylene 624 Total Residual 4500-CL-D,E Chlorine Total Residual 4500-CL-G Chlorine Total Suspended SM2540 D Solids Zinc 3120B
Zinc 200.8 Page 53 of 139 PermitNo. IN0000281

0.5 1.6 0.023 0.073 2.0 [5] 5.7 0.5 1.6

--- 2000 400 1300

20 64

---- ---- 0.31 1.0 2.5 8.0
1 3.2 31 100
100 320 0.3 0.94 0.31 1.0 0.0002 0.0005 0.2 0.64 2.0 6.4 1 3.2 0.5 1.6 2000 5000 2 6.4 1 3.2 0.2 0.64 200 640

0.4 1.3 20 60
20 60
0.64 2.0
3.3 10
1.0 3.2Page 54 of 139 PermitNo. IN0000281 [1] The methods listed are the EPA Methods referenced in40 CFR 136 or approved Standard Methods (SM). [2] American Public HealthAssociation. 1992. Standard Methods for the Examination ofWater and Wastewater. 181h Edition. Public Health Assoc., 1015 15th StreetNW, Washington DC 20005. [3] Not Used. [4] Method 610-GC/MS shall be used at Outfall501. [5] MDL and resulting LOQ apply to Outfall501. [6] Revision E, or the most currently approved revision. [7] Mass for each corresponding LOD and LOQ shall be determined using the corresponding concentrationprovided inthe above table multiplied by 8.345 multiplied bythe corresponding outfalls flow inMGD. For each outfall use the following inMillion Gallons per Day (MGD): Outfall 005 = 60.4; Outfall 005 (with former 010)= 61.2 Outfall 015=1.7; Outfall 018= 58.2; Outfall 019= 49.3; Outfall 020= 80.6; Outfall 021= 0.6; Outfall 023= 0.1; Outfall 028/030= 28.2; Outfall 032= 0.3; Outfall 033 = 0.2; Outfall 034= 25.4; Outfall 035= 156.8; Outfall 037= 3.0; Outfall 039= 55.0; Outfall 041=0.086.
The permittee may determine a case-specific Limit ofDetection (LOD) or Limit ofQuantitation (LOQ) using the analytical method specified above, or any othertestmethod which is approved by IDEM priorto use. The LOD shall be derived bythe procedure specified for method detection limits contained in40 CFRPart 136, Appendix B, and the LOQ shall be set equal to 3.18 times the LOD. Other methods maybe used iffirst approved by the IDEM.
5. Recording ofResults
For each measurement or sample taken pursuantto the requirements of this pennit, the permittee shall record the following information:

a. The exact place, date, and time ofsampling;
b. The person(s) who performed the sampling or measurements;

c. The dates the analyses were performed;
d The person(s) who performedthe analyses;

e. The analytical techniques ormethods used; and
f. The results ofall required analyses and measurements.6. Additional Monitoring by Permittee Page 55 of 139 PermitNo. IN0000281

Ifthe permittee monitors any pollutant at the location(s) designated herein more frequently than requiredby this permit, using approved analytical methods as specified above, the results ofthis monitoring shall be included in the calculation and reporting ofthe values required inthe monthly Discharge Monitoring Report (DMR). Such increased frequency shall also be indicated. Other monitoring data not specifically required in this permit (such as internal process or internal waste stream data) which is collected by or for the permittee need not be submittedunless requested by the Commissioner.
7. Records Retention
All records and information resulting from the monitoring activities required bythis permit, including all records ofanalyses performed and calibration and maintenance ofinstrumentation and recording from continuous monitoring instrumentation, shall be retained for a minimum of three (3) years. In cases where the original records are kept at another location, a copy ofall suchrecords shall be kept atthe permitted facility. The three years shall be extended:

a. automatically during the course ofany unresolved litigation regarding the discharge ofpollutants by the permittee or regarding promulgated effluent guidelines applicable to the permittee; or b. as requested bythe Regional Administrator orthe Indiana Department ofEnvironmental Management.
D. SCHEDULE OF COMPLIANCE Outfall 005 Benzo(a)pyrene and Whole Effluent Toxicity (WET)
1. The permittee shall achieve compliance with the effluent limitations specified for Benzo(a)pyrene and WET at Outfall 005 as soon as possible butno later thanthirty-four (34) months from the effective date ofthis permit in accordance withthe following schedule:

a. The permittee shall submit a written Plan onthe ability to achieve compliance withthe new final effluent limits to the Compliance Evaluation Section ofthe Office ofWater Quality (OWQ) nine (9) months from the effective date ofthis permit. IDEM will provide any comments within 30 days ofreceipt ofthe Plan and the permittee will implement the Plan immediately after receipt of IDEM's comments. The Plan shall include a description ofthe method(s) selected for meeting the newly imposed limitations forPage 56 of 139 Pem1itNo. IN0000281 Benzo(a)pyrene and WET at Outfall 005, in addition to any other relevant information. Relevant information should include but is not be limited to summaries ofanypilot studies completed, determination offinal process selection, a summary ofthe status of engineering design ofthe selectedprocesses, project status, equipmentprocurement, delivery, construction, training, startup, etc. The Plan shall also include a specific time line specifying when each ofthe steps will be taken. The new effluent limits for Benzo(a)pyrene andWET are deferred for the term ofthis compliance schedule, unless the new effluent limits canbe met at an earlier date. The permittee shall notify the Compliance Evaluation Section ofOWQ as soon as the newly imposed effluent limit for Benzo(a)pyrene and/or WET canbe met. Upon receipt of such notification by OWQ, the finallimits listed in the corresponding discharge limitations Table for Benzo(a)pyrene and/or WET at Outfall 005 will become effective, butno laterthan thirty-four (34) months from the effective date ofthis permit. Monitoring andreporting ofthe effluent for this parameter is required during the interimperiod.
b. The permittee shall.submit a progress reportto the Compliance Evaluation Section ofOWQ no later than eighteen (18) months from the effective date ofthis permit. This report shall include detailed information onthe steps the permittee has taken to achieve compliance with the final effluent limitations and whetherthe permittee is meeting the time line set outinthe initial Plan.

c. The permittee shall submit a subsequentprogress report to the Compliance Evaluation Section ofOWQ no laterthantwentyseven (27) months from the effective date ofthis permit. This report shall include detailed information onthe steps the permittee has takento achieve compliance withthe final effluent limitations and whetherthe permittee is meetingthe time line set outinthe initial Plan.
d. Withinthirty (30) days ofcompletion ofconstruction, the permittee shall file with the IndustrialNPDES Permits Section of OWQ a notice ofinstallationfor the additional pollutant control equipment and a design summary ofany modifications.

e. The permittee shall comply with the fmal effluent limitations for Benzo(a)pyrene and WET at Outfall 005 no laterthanthirty-four (34) months from the effective date ofthispermit.Page 57 of 139 PermitNo. IN0000281 2. Ifthe permittee fails to comply with any deadline contained in the foregoing schedule, the permittee shall, within fourteen (14) days following the missed deadline, submit a written notice ofnoncompliance to the Compliance Evaluation Section ofthe OWQ stating the cause of noncompliance, any remedial action taken orplanned, and the probability ofmeeting the date fixed for compliance with final effluent limitations

.

.E. SCHEDULE OF COMPLIANCE

- Mercury Except as provided below in Paragraph 2, U. S. Steel: (a) shall implement the following activities for evaluating, selecting, and installing mercury control technology; (b) shall achieve compliance with all final water quality based effluent limitations for mercury as soon as possible, but in no event later than sixty months after the effective date ofthis permit; and, (c) shall not be required to comply with the final water quality based effluent limitations for mercury until sixty months after the effective date ofthis permit.
1. Evaluating, Selecting and Installing Mercury ControlTechnology
A. EngineeringEvaluation

a. As soon as possible, but in no event later than December 31, 2009, U. S. Steel shall complete an engineering review of mercury control technologies. The review shall include at a minimum, an assessment ofall available and potential mercury control technologies including, but not limited to: ion exchange; carbon adsorption; chemical precipitation; filtration, including ultrafiltration; and biological treatment. The review shall identify sites where the evaluated technologies are currently implemented and shall provide information on the efficacy of the technologies in removing mercury at those sites.
b. As soon as possible, but in no event later than February 28, 2010, U. S. Steel shall submit to IDEM an Engineering Review Report summarizing findings from the review ofmercury control technologies.
B. Selection ofMercury Control Technologies

a. By the end of 13 months from the effective date ofthe permit, U. S. Steel will submit to IDEM a progress report on mercury source reduction activities and selection of potential mercury control technologies conducted during the first 12 months ofthe permit.
b. For each outfall that is subject to water quality based effluent limitations for mercury, U. S. Steel shall complete the following as soon as possible,Page 58 of 139 PermitNo. IN0000281

but in no event later than twenty-four months after the effective date of this permit:

1. Develop a list of mercury control technologies that could be installed to reduce mercury discharges to meet the water quality based effluent limitations for the specific outfall at issue. In developing the list, U. S. Steel shall consider the engineering evaluation described above and a preliminary evaluation of the discharge characteristics ofthe specific outfall at issue. For each teclmology, U. S. Steel shall assess the teclmical feasibility to pilot test and install the teclmology for the outfall.

11. Evaluate the following with regard to each mercury control teclmology listed for each specific outfall at issue: 1. Technical implications or impact onproducts; 2. Mercury reduction; 3. Cross media impacts; 4. Multi-pollutant co-control benefits; 5. Energy efficiency or consumptionimpact; 6. Service water contributions; and 7. Economic considerations.

111.

**Perform~** pilot testing of at least one listed mercury control teclmology for the specific outfall for which the technology was listed for purposes of obtaining additional information on the feasibility ofinstalling the specific mercury control technology to reduce mercury discharges to meet the water quality based effluent limitations for the specific outfall at issue. 1v. Eitlier select the specific mercury control technologies that shall be installed to reduce mercury discharges to meet the water quality bas;::d effluent limitations for the specific outfall at issue or detcm1ine that further pilot testing is necessary before a specific teclmology canbe selected.

c. As soon as possible, but in no event later than twenty-six months after the effective date ofthis permit, U. S. Steel shall submit an Engineering Evaluation Report to IDEM describing (i) the results ofthe evaluation and pilot testing described above, (ii) the specific mercury control teclmology or technologies that were selected in accordance with Paragraph l.B.b.iv to be installed or an explanation as to why further pilottesting is necessary before a specific teclmology can be selected for a specific outfall, (iii) why each specific technology was selected for each specific outfall, (iv) where the teclmologies shall be installed at the facility and why installation of the teclmologies at the locations shall reduce mercury discharges to meet the water quality based effluentPage 59 of 139 Permit No. IN0000281 limitations for each specific outfall, (v) a schedule for installation ofthe technologies on an outfall-by-outfall basis, that is as expeditious as possible, and (vi) for all technologies that were considered during the Engineering Evaluation but not selected, an explanation as to why the specific technology was not selected.
d. To the extent that U. S. Steel is unable to select a specific technology in accordance with Paragraph l.B.b.iv for installation to reduce mercury discharges to meet the water quality based effluent limitations for any specific outfall, U. S. Steel shall describe in the Engineering Evaluation Report the steps that it shall take (and a schedule for doing so) for each such outfall to (i) perform further pilot testing, (ii) select a specific technology or technologies in sufficient time to enable it to complete construction ofthe specific technology no later than ±i:fty-eight months from the effective date of this permit, and complete commissioning/training/start-up of the selected technologies no later than sixty months from the effective date ofthis permit.

e. For each specific outfall for which U. S. Steel was unable to select a specific technology in accordance with Paragraph l.B.b.iv, U. S. Steel shall select specific mercury control technologies that shall be installed to reduce mercury discharges to meet the water quality based effluent limitations for the specific outfall at issue in accordance with the schedule developed in accordance with Paragraph l.B.d. Within two months ofselecting specific mercury control technologies in accordance with this paragraph, U. S. Steel also shall submit to IDEM a Supplemental Engineering Evaluation Report pertaining to these outfalls describing and/or specifying: (i) the results ofany additional pilottesting that was performed, (ii) the specific mercury control technology or technologies that were selected to be installed, (iii) why each specific technology was selected for each specific outfall, (iv) where the technologies shall be installed at the facility and why installation of the technologies at the locations shall reduce mercury discharges to meet the water quality based effluent limitations for each specific outfall, (v) the date or dates when construction ofthe specific technology or technologies will commence;Page 60 of 139 PermitNo. IN0000281 (vi) the date or dates when construction ofthe specific technology will be completed, which shall be as soon as possible but no later than fifty-eight months from the effective date of this permit; and (vii) the date or dates when commissioning/training/start-up ofthe selected technologies will be completed, which shall be as soon as possible but no later than sixty months from the effective date ofthis permit.
C. Installation ofMercury Control Technology
For each outfall for which technology was selected in accordance with Paragraph l.B:

a. Following selection of a specific teclmology, U. S. Steel shall complete engineering design for each of the specific mercury control technologies that were selected for installation, and shall provide written notice to IDEM that it has done SG. b. Bythe end of36 months from the effective date ofthe permit, U. S. Steel will submit a progress report as outlined m the Engineering Evaluation ReportperParagraph l.B.c.

c. As soon as possible, but in no event laterthan forty-six months from the effective date of this permit, U. S. Steel shall commence construction on each ofthe specific mercury control technologies that were selected for installation in accordance with Paragraph l.B.b.iv. For technologies that were selected in accordance with Paragraph l.B.e, U. S. Steel shall commence construction in accordance with the schedule specified in the Supplemental Engineering Report in accordance with Paragraph l.B.e. TJ. S. Steel shall provide writtennotice to IDEM whenever itcommences construction in accordance withthis paragraph.
d. As soon as possible, but in no event later than fifty-eight months from the effective date ofthis permit, U. S. Steel shall complete construction of each ofthe specific mercury control technologies that were selected for installation in accordance with Paragraph l.B , and shall provide written notice to IDEM that ithas done so.

e. As soon as possible, but in no event later than sixty months from the effective date of this permit, U. S. Steel shall complete commissioning, training and start-up of each of the specific mercury control technologies that were selected for installation inPage 61 of 139 PermitNo. IN0000281 accordance with Paragraph 1.B., and shall provide written notice to IDEM that it has done so. 2. Termination ofCompliance Schedule
U. S. Steel is implementing mercury monitoring and mercury source reduction activities which may lead U. S. Steel to determine that it can achieve compliance with the final water quality based effluent limitations for mercury applicable to specific outfalls without constructing mercury control technology for the specific outfall or outfalls at issue in accordance with this compliance schedule. IfU. S. Steel makes that determination, U. S. Steel may choose to terminate this compliance schedule as it relates to any specific outfall by providing written notice to IDEM ofits decision. On and after the date ofthe written notice that U.S. Steel provides to IDEM, U.S. Steel shall be required to comply with the final water quality based effluent limitations for mercury applicable to the specified outfall or outfalls, but shall not be required to continue implementing the requirements ofthis compliance schedule pertinent to the specified outfall or outfalls at issue.
F. SCHEDULE OF COMPLIANCE- Outfall 010 Benzo(a)pyrene
This Schedule ofCompliance is no longer applicable and has been removed. The redirection ofOutfall 010 through Outfall 005 was completed June 5, 2011. The combined discharge is regulated as Outfall 005 in Part I.A.2. The Schedule of Compliance for Outfall 005 Benzo(a)pyrene is still in effect and is found in Part I.D. ofthis permit.

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G. POLLUTION MINIMIZATION PROGRAM
This permit contains water quality-based effluent limits for Total Residual Chlorine which are less thanthe listed limitation ofquantitation (LOQ) value. The permittee is required to develop and conduct apollutant minimization program (PMP) for Total Residual Chlorine. A PMP has already been conducted for Total Residual Chlorine at Outfall 034, therefore, a newPMP at Outfall 034 will not be required for Total Residual Chlorine. One basic PMP for TRC can be submitted for all affected Outfalls. Ifthe PMP submitted previously for Outfall 034 incorporates the PMP requirements that will be in essence the same as for the otherUS Steel outfalls covered inthis permitthen all USS will need to do to meet this requirement is to re-submitthat PMP along with a letterto that effect and separate PMP's for the remaining outfalls will not be required.
The laboratory US Steel utilizes to measure selenium has been capable of measuring down to a level that is currently belowthe water quality based effluent limit. As long as the laboratory is capable ofdemonstratingthe case-specificPage 63 of 139 PermitNo. IN0000281

LOD of 1.0 ug/1 using Test Method 270.2, the pollutantminimizationprogram remains suspended for Selenium at Outfall 005. Ifit is determined that the casespecific LOD is invalid then the original PMP requirements shall be reimplemented for Selenium at Outfall 005.
1. The goal ofthe pollutant minimizationprogram shall be to maintain the effluent at or belowthe WQBEL. The polluta1:.t minimization program shall include, but is not limited to, the following:

a. Submit a control strategy designed to proceed toward the goal within 180 days ofthe effective date ofthis permit.
b. Implementation appropriate cost-effective control measures, consistent withthe control strategy within 365 days ofthe effective date ofthis permit.

c. Monitor as necessary to record the progress toward the goal. Potential sources ofthe pollutant shall be monitored on a semiannual basis. Quarterly monitoring oftheinfluent ofthe wastewater treatment system is also required. The permittee may request a reduction inthis monitoring requirement after four quarters ofmonitoring data.
d. Submit an annual status to the Commissioner at the address listed inPart I.C.3.g. to the attention ofthe Office ofWater Quality, Compliance Evaluation Section, by January 31 ofeach year that includes the following information: (i) All minimization program monitoring results for the prevwus year. :(ii) A list ofpotential sources ofthe pollutant. (iii) A summary ofall actions taken to reduce or eliminate the identified sources ofthe pollutant.

e. A pollutionminimizationprogram may includethe submittal of pollution prevention strategies that use changes in production process technology, materials, processes, operations, orprocedures to reduce or eliminate the source ofthe pollutant.
2. No pollution minimizationprogram is required ifthe permittee demonstrates that the discharge ofapollutantwith a WQBEL belowthe LOQ is reasonably expectedto be in compliance withthe WQBEL at thePage 64 ofl39 PennitNo. IN0000281 point ofdischarge into the receiving water. This demonstration may include, butis not limited to, the following:

a. Treatment infonnation, including information derived from modeling the destruction ofremoval ofthe pollutant in the treatmentprocess. b. Mass balance information.

c. Fishtissue studies or otherbiological studies.
3. In determining appropriate cost-effective control measures to be implemented in apollution minimizationprogram, the following factors maybe considered:

a. Significance ofsources. b. Economic and technical feasibility.

c. Treatability.
H. REOPENING CLAUSES
This permit may be modified, or alternately, revoked and reissued, after public notice and opportunity for hearing:
1. to comply with any applicable effluent limitation or standard issued or approved under 301(b)(2)(C),(D) and (E), 304 (b)(2), and 307(a)(2) ofthe Clean Water Act, ifthe effluent limitation or standard so issued or approved:

a. contains different conditions oris otherwise more stringentthan any effluent limitation in the permit; or b. controls any pollutant not limited inthe permit.
2. to incorporate any ofthe reopening clause provisions cited at 327 lAC 5- 2-16.
3. to include limitations for specific toxicants ifthe results ofthe biomonitoring and/orthe TRE study indicate that such limitations are necessaryto meet Indiana Water Quality Standards.
4. Afterreviewing the temperature monitoring data as required in Part III of the permit, the IDEM reserves the right to reopenthe permit and, afterPage 65 of 139 Pe1mit No. IN0000281 public notice and opportunity for hearing, to establish more appropriate temperature requirements.
5. to include a case-specific Limit ofDetection (LOD) and/or Limit of Quantitation (LOQ). The permittee must demonstrate that such action is warranted in accordance withthe procedures specified under Appendix B, 40 CFRPart 136, using the most sensitive analytical methodsapproved by EPAunder 40 CFRPart 136, or approved by the Commissioner.
6. To revise (such as more or less frequent monitoring) or remove the requirements ofthe pollutant minimization program (Part I.G.) if supported by information generated as a result ofthis program. 7. To incorporate effluent limitations reflecting the results ofa TMDL or a revised wasteload allocation ifthe IDEM determines that such effluent limitations are needed to assure that State Water Quality Standards are met in the receiving stream. 8. To include revisions basedupon site specific studies. The permittee shall submit workplans to conduct such site-specific studies before initiation of the study. Workplans mustbe approved by IDEM and the results ofall such studies mustbe approved by IDEM and possibly EPA. Any necessary rulemaking mustbe completed before the pe1mit may be modified to reflect the results ofthe studies.
9. To include a monitoring waiver for total cyanide and silver at Outfall 604 ifthe IDEM determines that such a waiver is appropriate after the review ofat least twelve (12) months ofmonitoring data.
10. To modify the monitoring frequency for CBOD5after a review oftwelve months ofdata at Outfalls 607 and 015.
I. SANITARY LIFT STATION EMERGENCY OVERFLOWS
1. Discharges from sanitary sewer system lift stations or any other portion of the sanitary sewer system are expressly prohibited. Should any discharge occur, the permittee shall notify the Compliance Evaluation Section within the Office ofWater Quality within 24 hours and inwriting within five days ofthe event in accordance with Part II.C.4. The correspondence shall include a description ofthe duration and cause ofthe discharge as well as the remedial action takento eliminate it. The duration and estimated volume ofthe discharge shall also be reported onthe Discharge Monitoring Report. The permittee shall comply with any other relevant provision ofits permit inthe event ofa discharge, including 327 lAC 5-2- 8(3).Page 66 of 139 PermitNo. IN0000281 2. The above stipulations apply to the following sanitary lift stations:
Lift Station Discharge Point
Outfall 018 Outfall 023 Outfall 032 Outfall 033 SOF-6 SOF-11 SOF-3 SOF-51 SOF-1 SOF-2 SOF-4 SOF-5 SOF-17 Direct to Grand Calumet River Grand Calumet River via GW-11 Pumping Station Grand Calumet River via GW-10 Pumping Station Directto Lake Michigan Grand Calumet River via GW-10 Pumping Station
J. STORM WATERMONITORING AND NON-NUMERIC CONDITIONS
1. Beginning onthe effective date the permittee shall conduct storm water monitoring for the storm water discharge points set out inParagraph 2, of this section on a semi-annualbasis.
2. Storm Water Monitoring: (a) StormWater Monitoring Points:
SW-01 SW-02 SW-08 SW-11 SW-06 DA#ll DA#ll DA#32
bA#29 SW-12 (Railroad Kirk Yard) DA #22 Outfall 032 DA#20 Outfall 033 DA#21

DA

- Drainage Area GCR- Grand Calumet River LM

- Lake Michigan East Side ofSlip (LM) West Side ofSlip (LM) Virginia Tunnel Drain (GCR) Broadway Tunnel Drain (GCR) Railroad Lines (LM)
Outfall 034 Channel (GCR) Bar Mill and Billet Storage Areas (GCR) TinPlate Areas, Atmospheric Gas Plant, Sheet Mill (GCR)

(b) Monitoring requirements applicable to all points listed above:
Oil & Grease, Carbonaceous Biochemical Oxygen Demand (CBOD5), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total KjeldahlNitrogen, Nitrite Plus Nitrate Nitrogen, Total Phosphorus, zinc, andpH.Page 67 of 139 PermitNo. IN0000281
(c) Additional monitoring requirements for specific outfalls are: Monitoring Points SW-01, 02, 06, 08, 11, and SW-12- Ammonia (as N), lead, andcopper. Monitoring Points SW-02- Iron and Manganese. (d) For all point source discharges ofstorm water see Part LB. ofthe permit for theNarrative Water Quality Standards. (e) Inthe event storm water runoffis not discharged from the same locations monitored for inthe storm water application (2F) dated March 1999, thepermittee shall monitor storm waterrunofffrom a point or points representative ofthe discrete storm water drainage areas illustrated in the application. (f) Areas no longer subjectto Storm Waterrequirements:
DA#1, #3, #4 Coal Handling Yard- Mason Basin#5 does not discharge to waters ofthe State. SW-10- Tennessee Drain (Redirected to the Blast Furnace Recycle ClosedLoop) does not discharge to waters ofthe State. (g) Monitoring Pollutant Reduction Measures:
This permit stipulates a pollutant baseline concentrationthat shall be used as a means for comparison offuture discharge concentrations. Baseline monitoring will be on a semi-annual basis and will provide a basis for the facility to knowwhen additional corrective measures are necessary. US Steel will use theprevious five years ofstormwater data from the effective date ofthepermitto statistically determine the initial baseline concentration for total recoverable zinc, total suspended solids, and COD. Newbaseline concentrations shall be statisticallyre-calculated using a five year rolling dataset wheneverthe semi-annual concentration(s) is less than the existing baseline concentration(s). A newbaseline exceeding an existing baseline will defaultto the existing baseline until the nextrecalculation. A sample result exceeding an existing baseline atthe time of comparison shall neverbe included in a baselinerecalculation.
Stormwatermonitoring data collected duringthe permitterm shall be comparedto the baseline concentrations to determine ifthe control measures being implemented at the site result in animprovement from the baseline established bythe permittee. Ifthe sample result exceeds the baseline concentration, the permittee musttake corrective actions in PartPage 68 of 139 PermitNo. IN0000281

1.7.b

.. ofthe permit. Follow-up sampling should occur as soon as possible after implementation ofcorrective actions.
An exceedance ofa baseline concentration is not apermit violation. However, failing to take the corrective actions in Part 1.7 as a result ofa baseline concentration exceedance is a violation ofthepermit. The permittee shall strive for continuous improvement from the baseline until it has been demonstrated thatthe permittee has implemented the best managementpractice to meetthe provisions inPart J.5. ofthis permit. This permit also requires an annual review ofthe selection, design, installation, and implementation ofyour control measures (See PartJ.6).
The permittee shall retain any and all records relatedto this documentation withinthe SWPPP. In addition, this same informationmust also be submitted to the Industrial NPDES Permit Section on an annual basis. (h) Parameters for determining baseline concentrations: Monitoring Parameters

**--------·------------~** --------- 

## ___;__:.__;_:....___;_

**----------~·----** Parameter jOutfalls JMonitoring Concen

**-~~-~~-~~~** "

**·---------~------···~-** Total Recoverable Zinc !All stormwater locations in 1.2. !Report mg/1
---------------------------,- . ------------------------

**-----~----------·-----------·**



# "~6~s~_:ds~~:::::::::::~Jg$~~··

# -=:=j

2.5 Control Measures and Effluent Limits
In the technology-based limits included in PartJ.3-5., the term "minimize" means reduce and/or eliminate to the extent achievable using control measures (including best managementpractices) that are technologically available and economicallypracticable and achievable inlight ofbest industry practice.
3. Control Measures Select, design, install, and implement control measures (including best managementpractices) to address the selection and design considerations inPart 

### 1.4 to meetthe non-numeric effluent limits in Part 1.5. The selection, design, installation, and implementation ofthese control measures mustbe inaccordance with good engineering practices and manufacturer's specifications. This also includes the BMP requirements for the Coal Processing Area. Any deviation from the manufacturer's specifications shall be documented. Ifthe control measures are not achievingtheir intended effect inminimizing pollutantPage 69 of 139 PennitNo. IN0000281
discharges, the control measures must be modified as expeditiously as practicable. Regulated stormwater discharges from the facility include stormwater run-on that commingles with stormwater discharges associated with industrial activity at the facility.
4. Control Measure Selection and Design Considerations
When selecting and designing control measures considerthe following:

a. preventing stormwater from coming into contact with polluting materials is generally more effective, and cost-effective, than trying to remove pollutants from stormwater; b. use ofcontrol measures in combination is more effective than use ofcontrol measures in isolation for minimizing pollutants in stormwater discharge;

c. assessing the type and quantity ofpollutants, including their potential to impact receiving water quality, is critical to designing effective control measures that will achieve the limits inthis permit;
d. minimizing impervious areas at your facility and infiltrating runoff onsite (including bioretention cells, green roofs, and pervious pavement, among other approaches), can reduce runoffand improve groundwater recharge and stream base flows inlocal streams, although care must be taken to avoid ground water contamination;

e. flow can be attenuated by use ofopenvegetated swales and natural depressions; f. conservation and/or restoration ofriparian buffers will help protect streams from stormwater runoffand improve water quality; and
g. use oftreatment interceptors (e.g., swirl separators and sand filters) maybe appropriate in some instances to minimizethe discharge of pollutants.
5. Technology-Based Effluent Limits (BPT/BAT/BCT): Non-Numeric Effluent Limits

a. Minimize Exposure
Minimize the exposure ofraw, final, or waste materials to rain,Page 70 of 139 PermitNo. IN0000281

snow, snowmelt, and runoff. To the extent technologically available and economicallypracticable and achievable, either locate industrial materials and activities inside orprotect them with storm resistant coverings in orderto minimize exposure to rain, snow, snowmelt, and runoff(although significant enlargement of impervious surface area is not recommended). In minimizing exposure, payparticular attentionto the following areas: Loading and unloading areas: locate inroofed orcovered areas where feasible; use grading, benning, or curbing around the loading areato divert run-on; locate the loading and unloading equipment and vehicles so that leaks are contained inexisting containment and flow diversion systems. Material storage areas: locate indoors, or inroofed or covered areas where feasible; install berms/dikes around these areas; use dry cleanup methods.
Note: Industrial materials do not need to be enclosed or covered ifstonnwater runofffrom affected areas will notbe discharged to receiving waters. b. Good Housekeeping Keep clean all exposed areas that are potential sources of pollutants, using suchmeasures as sweeping at regular intervals, keeping materials orderly and labeled, and stowing materials in appropriate containers.
As part ofthe developed good housekeeping program, include a cleaning and maintenance program for all impervious areas ofthe facility where particulate matter, dust, or debris may accumulate, especially areas where material loading and unloading, storage, handling, andprocessing occur; and where practicable, the paving ofareas where vehicle traffic or material storage occurbut where vegetative or other stabilizationmethods are notpracticable (institute a sweeping program inthese areas too). Forunstabilized areas where sweeping is notpracticable, consider using stonnwater management devices such as sedimenttraps, vegetative buffer strips, filter fabric fence, sediment filtering boom, gravel outlet protection, orother equivalent measures that effectivelytrap or remove sediment.