Mitigation Order on Consent

Voluntary Remediation Program

Sierrita Facts

 

 

 

Sierrita Mitigation Order on Consent

2024

11/25/24	Letter from Alexander Hlebovy, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Second Quarter and Third Quarter 2024 (PDF file - 432 pages)
04/22/24	Letter from Alexander Hlebovy, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Mitigation Performance Review for 2023 (PDF file - 161 pages)
04/22/24	Letter from Alexander Hlebovy, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Fourth Quarter 2023 and First Quarter 2024 (PDF file - 340 pages)
03/19/24	Letter from Alexander Hlebovy, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Reporting Year 2023 Mitigation Facilities Monitoring Report (PDF file - 55 pages)

2023

11/14/23	Letter from Alexander Hlebovy, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Second Quarter and Third Quarter 2023 (PDF file - 390 pages)
04/19/23	Letter from William Hart, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Fourth Quarter 2022 and First Quarter 2023 (PDF file - 319 pages)
03/30/23	Letter from William Hart, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2022 Mitigation Facilities Monitoring Report (PDF file - 52 pages)

2022

11/28/22	Letter from William Hart, Sierrita, to Bret Esslin, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Second Quarter and Third Quarter 2022 (PDF file - 412 pages)
05/19/22	Letter from William Hart, Sierrita, to Ashley Devore, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Fourth Quarter 2021 and First Quarter 2022 (PDF file - 396 pages)
03/28/22	Letter from William Hart, Sierrita, to Ashley Devore, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2021 Mitigation Facilities Monitoring Report (PDF file - 53 pages)

2021

11/18/21	Letter from William Hart, Sierrita, to Ashley Devore, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Second and Third Quarter 2021 (PDF file - 422 pages)
05/19/21	Letter from William Hart, Sierrita, to Oliver Navo, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Fourth Quarter 2020 and First Quarter 2021 (PDF file - 380 pages)
03/29/21	Letter from William Hart, Sierrita, to Oliver Navo, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2020 Mitigation Facilities Monitoring Report. (PDF file - 53 pages)

2020

11/12/20	Letter from William Hart, Sierrita, to Oliver Navo, ADEQ; Mitigation Order on Consent No. P-50-06; Semi-Annual Groundwater Monitoring Report, Second and Third Quarter 2020 (PDF file - 422 pages)
05/19/20	Letter from William Hart, Sierrita, to Oliver Navo, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Fourth Quarter 2019 and First Quarter 2020 (PDF file - 523 pages)
05/13/20	Letter from William Hart to Oliver Navo, ADEQ. Resumption of quarterly sulfate sampling at MO-2009-1 (PDF file - 6 pages)
03/13/20	Letter from William Hart, Sierrita, to Oliver Navo, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2019 Mitigation Facilities Monitoring Report (PDF file - 52 pages)

2019

10/16/19	Letter from William Hart, Sierrita, to Oliver Navo, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Second and Third Quarter 2019 (PDF file - 441 pages)
05/22/19	Letter from William Hart, Sierrita, to Oliver Navo, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Fourth Quarter 2018 and First Quarter 2019 (PDF file - 357 pages)
03/06/19	Mitigation Facilities Monitoring Report for 2018 (PDF file - 52 pages)
03/06/19	Letter from William Hart, Sierrita, to David Lelsz, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Notification of annual mitigation pumping rate below the performance goal (PDF file - 2 pages)
04/24/19	Mitigation Performance Review for 2018 (PDF file - 291 pages)

2018

11/21/18	Letter from William Hart, Sierrita, to David Lelsz, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Second and Third Quarter 2018 (PDF file - 496 pages)
06/07/18	Letter from William Hart, Sierrita, to David Lelsz, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2017 Mitigation Facilities Monitoring Report (PDF file - 52 pages)
05/22/18	Letter from William Hart, Sierrita, to David Lelsz, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-Annual Groundwater Monitoring Report, Fourth Quarter 2017 and First Quarter 2018 (PDF file - 391 pages)
04/25/18	Letter from William Hart, Sierrita, to David Lelsz, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Mitigation Performance Review for 2017 (PDF file - 245 pages)

2017

12/18/17	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Second and Third Quarters 2017 (PDF file - 1 page)
11/07/17	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Second and Third Quarters 2017 (PDF file - 450 pages)
05/10/17	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Fourth Quarter 2016 and First Quarter 2017 (PDF file - 369 pages)
04/20/17	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2016 Mitigation Performance Review Report (PDF file - 239 pages)
03/27/17	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2016 Mitigation Facilities Monitoring Report (PDF file - 52 pages)

2016

11/14/16	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Second Quarter and Third Quarter 2016. (PDF file - 468 pages)
09/14/16	Letter from Nirupma Bhatia, ADEQ to Deborah Chismar, Sierrita; Mitigation Order on Consent Docket No. P-50-06, ADEQ accepts Sierrita’s proposal to Discontinue Quarterly Status Reports (PDF file - 1 page)
06/30/16	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; 2016 April 1st through June 30th Status Report. (PDF file - 1 pages)
06/27/16	Email from Nirupma Bhatia, ADEQ to Deborah Chismar, Sierrita; Mitigation Order on Consent Docket No. P-50-06, ADEQ accepts Sierrita’s proposal to Discontinue Quarterly Status Reports (PDF file - 1 page)
06/27/16	Letter from Deborah Chismar, Sierrita to Nirupma Bhatia, ADEQ; Mitigation Order on Consent Docket No. P-50-06, Proposal to Discontinue Quarterly Status Reports (PDF file - 1 page)
05/12/16	Letter from Deborah Chismar, Sierrita, to Nirupma Bhatia, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Second Quarter and Third Quarter 2016 (PDF file - 467 pages)
05/12/16	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Fourth Quarter 2015 and First Quarter 2016 (PDF file - 311 pages)
04/28/16	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2015 Mitigation Performance Review Report (PDF file - 259 pages)
03/31/16	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; 2016 January 1st through March 31st Status Report (PDF file - 1 page)
03/25/16	Letter from, Madeline Keller, ADEQ to Deborah Chismar, Review of Contingency Plan for Sulfate with Respect to Drinking Water Supplies in the Vicinity of the Freeport-McMoRan Sierrita Inc. Tailing Impoundment, Docket No. P-50-06, dated February 17, 2016 (PDF file - 2 page)
03/25/16	Letter from Madeline Keller, ADEQ to Deborah Chismar, Review of the 2014 Freeport-McMoRan Sierrita Inc. Mitigation Facilities Operation technical Memorandum Report, dated March 31, 2015 (PDF file - 1 page)
03/07/16	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2015 Mitigation Facilities Monitoring Report (PDF file - 53 pages)
02/17/16	Letter from Deborah Chismar, Sierrita to Mindi Cross, ADEQ, Response and updated Contingency Plan for Sulfate with Respect to Drinking Water Supplies in the Vicinity of the Freeport-McMoRan Sierrita Inc. Tailing Impoundment, Docket No. P-50-06 (PDF file - 31 pages)
01/22/16	Letter from, Mindi Cross, ADEQ to Deborah Chismar, Sierrita Notice of Contingency Plan for Sulfate with Respect to Drinking Water Supplies in the Vicinity of the Freeport-McMoRan Sierrita Inc. Tailing Impoundment, Docket No. P-50-06 (PDF file - 2 pages)

2015

12/31/15	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; October 1st through December 31st Status Report (PDF file - 1 page)
11/20/15	Letter from Madeline Keller, ADEQ to Deborah Chismar, Sierrita: Mitigation Order on Consent Docket No. P-50-06, ADEQ’s Review of the Mitigation Plan for Alternative 3, approved. (PDF file - 3 pages)
11/20/15	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Second Quarter and Third Quarter 2015 (PDF file - 393 pages)
11/09/15	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ Contingency Plan for Sulfate with Respect to Drinking Water Supplies in the Vicinity of the Freeport-McMoRan Sierrita Inc. Tailing Impoundment, Docket No. P-50-06 (PDF file - 11 pages)
09/30/15	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; July 1st through September 30th, 2015, Status Report (PDF file - 1 page)
06/28/15	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; April 1st through June 30th, 2015, Status Report (PDF file - 2 pages)
06/23/15	Letter from Deborah Chismar, Sierrita, to Mindi Cross, ADEQ Review of Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 4 pages)
05/19/15	Letter from Deborah Chismar, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Fourth Quarter 2014 and First Quarter 2015 (PDF file - 312 pages)
04/30/15	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2014 Mitigation Performance Review Report (PDF file - 235 pages)
03/31/15	Letter from Diana Kelts, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; January 1st through March 31st, 2015, Status Report (PDF file - 2 pages)
03/31/15	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; Reporting Year 2014 Mitigation Facilities Monitoring Report (PDF file - 54 pages)
02/05/15	Letter from Madeline Keller, ADEQ to Diana Kelts, Sierrita; Response to Mitigation Order on Consent No. P-50-06; October 1 through December 31, 2014, Status Report (PDF file - 1 page)

2014

12/30/14	Letter from Diana Kelts, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; October 1st through December 31th, 2014, Status Report (PDF file - 2 pages)
10/28/14	Letter from Diana Kelts, Sierrita, to Mindi Cross, ADEQ; Semi-annual Groundwater Monitoring Report For Samples Collected During the 2nd and 3rd Quarters 2014, prepared by Clear Creek Associates, P.L.C (PDF file - 126 pages)
09/30/14	Letter from Diana Kelts, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; July 1st through September 30th, 2014, Status Report (PDF file - 2 pages)
09/29/14	Letter from Madeline Keller, ADEQ, to Deborah Chismar, Sierrita; Review of the revised Mitigation Plan and the Well Field Operation and Maintenance Plan for the Sierrita Mitigation Order, dated December 18, 2013 prepared by Clear Creek Associates, P.L.C. (PDF file - 3 pages)
06/30/14	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; April 1st through June 30th, 2014, Status Report (PDF file - 2 pages)
05/20/14	Letter from Madeline Keller, ADEQ to Deborah Chismar, Sierrita; Response to Mitigation Order on Consent No. P-50-06; January 1 through March 31, 2014, Status Report and 2013 Interceptor Wellfield Operation Monitoring Report. (PDF file - 1 page)
04/24/14	Letter from Deborah Chismar, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Fourth Quarter 2013 and First Quarter 2014 (PDF file - 245 pages)
03/31/14	Letter from Deborah Chismar, Sierrita, to Madeline Keller, ADEQ; Mitigation Order on Consent No. P-50-06; January 1 through March 31, 2014, Status Report and 2013 Interceptor Wellfield Operation Monitoring Report (PDF file - 52 pages)

2013

12/31/13	Letter from Kanyembo Katapa, Sierrita, to Marcia Colquitt, ADEQ; Mitigation Order on Consent No. P-50-06; October 1 through December 31, 2013, Status Report and Sulfate Mitigation Action Well Filed Operations & Maintenance Plan (PDF file - 81 pages)
12/20/13	Letter from Kanyembo Katapa, Sierrita, to Marcia Colquitt, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Mitigation Plan (PDF file - 43 pages)
12/17/13	Letter from Kanyembo Katapa, Sierrita, to Marcia Colquitt, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Extraction Well System Start-up Schedule (PDF file - 1 page)
10/29/13	Letter from Kanyembo Katapa, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; Semi-annual Groundwater Monitoring Report, Second and Third Quarters 201 (PDF file - 396 pages)
09/30/13	Letter from Kanyembo Katapa, Sierrita to Mindi Cross, ADEQ; Mitigation Order on Consent Docket No. P-50-06, July 1st through September 30th, 2013 Status Report (PDF file - 2 pages)
07/01/13	Letter from Kanyembo Katapa, Sierrita to Mindi Cross, ADEQ; Mitigation Order on Consent Docket No. P-50-06, April 1st through June 30th, 2013 Status Report (PDF file - 2 pages)
04/19/13	Letter from Martha Mottley, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent, Docket No. P-50-06;Semi-annual Groundwater Monitoring Report, Fourth Quarter 2012 and First Quarter 2013. (PDF file - 129 pages)
03/28/13	Letter from Martha Mottley, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent No. P-50-06, January 1st through march 31st, 2013 Status Report and and 2012 Interceptor Wellfield Operation Monitoring Report.  (PDF file - 39 pages)
02/25/13	Letter from Mindi Cross, ADEQ, to Clinton Beck, Sierrita; Request for Mitigation Plan Implementation Schedule Extension – Mitigation Order on Consent P-50-06 (PDF file - 1 page)

2012

12/28/12	Letter from Clinton Beck, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent Docket No. P-50-06, October 1st through December 31st 2012, Status Report (PDF file - 2 pages)
11/27/12	Letter from Clint Beck, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent No. P-50-06, Request for Mitigation Plan Implementation Schedule Extension. (PDF file - 3 pages)
10/29/12	Letter from Clint Beck, Sierrita, to Mindy Cross, ADEQ; Semi-annual Groundwater Monitoring Report, Second and Third Quarter 2012, Mitigation Order on Consent, Docket No. P-50-06. (PDF file - 369 pages)
09/28/12	Letter from Martha Mottley, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent Docket No. P-50-06, July 1st through September 30th 2012, Status Report (PDF file - 2 pages)
06/29/12	Letter from Martha Mottley, Sierrita, to Mindi Cross, ADEQ; Mitigation Order on Consent No. P-50-06, April 1 through June 30 2012, Status Report (PDF file - 2 pages)
04/26/12	Letter from Martha Mottley, Sierrita, to Mindy Cross, ADEQ; Semi-annual Groundwater Monitoring Report, Fourth Quarter 2011 and First Quarter 2012, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 210 pages)
03/30/12	Letter from Martha Mottley, Sierrita, to Mindy Cross, ADEQ; Mitigation Order on Consent No. P-50-06, January 1 through March 31, 2012, Status and 2011 Interceptor Wellfield Operation Monitoring Report (PDF file - 36 pages)

2011

12/30/11	Letter from Martha Mottley, Sierrita, to Mindy Cross, ADEQ; Mitigation Order on Consent, Docket No. P-50-06; October 1st through Dec 30, 2011 Status Report (PDF file - 2 pages)
10/28/11	Letter from Martha Mottley, Sierrita, to Mindy Cross, ADEQ; Semi-annual Groundwater Monitoring Report, Second and Third Quarter 2011, Mitigation Order on Consent, Docket No. P-50-06. (PDF file - 97 pages)
9/27/11	Martha Mottley, Sierrita, to Mindy Cross, ADEQ; Mitigation Order on Consent No. P-50-06; July 1 through September 30, 2011, Status Report. (PDF file - 2 pages)
6/30/11	Letter from Martha Mottley, Sierrita, to Mindy Cross, ADEQ; Mitigation Order on Consent No. P-50-06; April 1 through June 30, 2011, Status Report and Operations & Maintenance Manual for the Interceptor Wellfield. (PDF file - 61 pages)
3/31/11	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Semi- annual Groundwater Monitoring Report, Fourth Quarter 2010 and First Quarter 2011, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 181 pages)
3/31/11	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, January 1 through March 31, 2011, Status and 2010 Interceptor Wellfield Operation Monitoring Report. (PDF file - 39 pages)
2/8/11	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Proposed changes to MC well locations, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 4 pages)

2010

10/4/10	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Groundwater Monitoring Report, Second and Third Quarter 2010, Mitigation Order on Consent, Docket No. P-50-06. (PDF file - 307 pages)
9/1/10	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06; Mitigation Plan Implementation update. (PDF file - 9 pages)
6/30/10	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, January April 1 through June 30, 2010, Status Report (PDF file - 5 pages)
4/28/10	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Semiannual Groundwater Monitoring Report, Fourth Quarter 2009 and First Quarter 2010, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 54 pages)
3/31/10	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, January 1 through March 31, 2010, Status Report and 2009 Interceptor Wellfield Operation Monitoring Report (PDF file - 39 pages)
3/26/10	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06; Mitigation Plan Implementation Gantt Chart (PDF file - 3 pages)
3/18/10	Letter from Chad Fretz, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06; Deferral of Mitigation Plan approval (PDF file - 5 pages)
1/29/10	Report from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06; Final Wellfield Conceptual Design (PDF file - 125 pages)

2009

12/18/09	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, October 1, 2009 through December 31, 2009, Status Report (PDF file - 2 pages)
10/23/09	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Groundwater Monitoring Report, Second and Third Quarter 2009, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 367 pages)
9/30/09	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, July1, 2009 through September 30, 2009, Status Report (PDF file - 3 pages)
9/11/09	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, Aquifer Testing Results Associated with Feasibility Studies (PDF file - 131 pages)
9/03/09	Letter from Martha Mottley, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, Monitor Well Installation Report Mo-2009-1 (PDF file - 78 pages)
6/30/09	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, April 1, 2009 through June 30, 2009, Status Report (PDF file – 4 pages)
6/12/09	Letter from Ned Hall, Sierrita to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06 Supplemental Information on Recommended Groundwater Monitoring for Sulfate (PDF file - 3 pages)
5/15/09	Letter from Ned Hall, Sierrita; to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, Response to ADEQ Comments on Recommended Groundwater Monitoring for Sulfate (PDF file - 6 pages)
5/08/09	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent Docket No. P-50-06, Response to ADEQ Comments on the Feasibility Study and Mitigation Plan (PDF file - 50 pages)
4/17/09	Letter from Cynthia Campbell, ADEQ, to Ned Hall, Sierrita; Mitigation Order on Consent No. P-50-06, Groundwater Monitoring for Sulfate (PDF file - 2 pages)
3/31/09	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, January 1, 2009 through March 31, 2009, Status Report (PDF file – 2 pages)
3/30/09	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Groundwater Monitoring Report, First Quarter 2009, Mitigation Order on Consent, Docket No. P-50-06 (PDF file – 354 pages)
3/6/09	Letter from Cynthia Campbell, ADEQ to Ned Hall, Sierrita; Mitigation Order on Consent No. P-50-06, ADEQ’s Response to Freeport’s Feasibility Report (PDF file – 6 pages)
2/2/09	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Revised Aquifer Characterization Report – Mitigation Order on Consent, Docket No. P-50-06 (PDF files) (Part A – 69 pages) (Part B – 10 pages) (Part C – 51 pages) (Part D – 204 pages) (Part E – 251 pages) (Part F – 275 pages) (Part G – 116 pages)
1/26/09	Letter from Cynthia Campbell, ADEQ to Ned Hall, Sierrita; Mitigation Order on Consent No. P-50-06, Recommended Groundwater Monitoring for Sulfate Your Letter Dated December 23, 2008 (PDF file - 2 pages)

2008

12/30/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, October 1, 2008 through December 31, 2008, Status Report (PDF file - 2 pages)
12/23/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent, Docket No. P-50-06, Recommended Groundwater Monitoring for Sulfate (PDF file - 4 pages)
12/19/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Groundwater Monitoring Report, Fourth Quarter 2008, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 443 pages)
10/23/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent, Docket No. P-50-06, Feasibility Study (Report Text and Tables - 163 pages) (Report Figures- 26 pages) (Appendix A - 65 pages) (Appendix B - 40 pages) (Appendix C - 43 pages) (Appendix D -34 pages) (AppendiX E - 13 pages) (Appendix F - 58 pages) (Appendix G - 45 pages) (Appendix H - 23 pages)
9/30/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, July 1, 2008 through September 30, 2008, Status Report (PDF file - 2 pages)
9/29/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Groundwater Monitoring Report, Third Quarter 2008, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 379 pages)
9/29/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent, Docket No. P-50-06, Response to ADEQ’s September 5, 2008 Comments (PDF file - 30 pages)
9/5/08	Letter from Cynthia S. Campbell, ADEQ to Ned Hall, Sierrita: Mitigation Order on Consent, Docket No. P-50-06, ADEQ Response to Freeport’s August 25, 2008 Letter (PDF file - 2 pages)
8/25/08	Letter from Ned Hall, Sierrita to Cynthia S. Campbell, ADEQ: Mitigation Order on Consent, Docket No. P-50-06, Response to ADEQ’s July 21, 2008 Comments (PDF file - 2 pages)
7/21/08	Letter from Cynthia S. Campbell, ADEQ, to Ned Hall, Sierrita - Mitigation Order on Consent No. P-50-06, ADEQ’s Response to Freeport’s Comments on ADEQ’s Initial Response to the Sierrita Aquifer Characterization Report (PDF file - 2 pages)
6/30/08	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06, April 1, 2008 through June 30, 2008, Status Report (PDF file - 2 pages)
6/24/08	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Groundwater Monitoring, Second Quarter 2008, Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 374 pages)
6/12/08	Letter from Ned Hall, Sierrita, to Cynthia Campbell, ADEQ; Mitigation Order on Consent No. P-50-06, Response to Arizona Department of Environmental Quality Comments on the Aquifer Characterization Report (PDF file - 41 pages)
4/24/08	Letter from Cynthia S. Campbell, ADEQ to E. L. (Ned) Hall, Sierrita; Mitigation Order, Docket No: P-50-06 - Review of Aquifer Characterization Report (PDF file - 25 pages)
4/17/08	Letter from Ned Hall, Sierrita, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06, Proposed Project Schedule Revision (PDF file - 2 pages)
3/31/08	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06, January 1, 2008 through March 31, 2008, Status Report (PDF file - 2 pages)
3/26/08	Letter from Robert Casey, ADEQ to Ned Hall, Sierrita Operations; Focused Feasibility Study (PDF File - 13 pages)
3/20/08	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Groundwater Monitoring Report First Quarter 2008, Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 389 pages)
1/31/08	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Quarterly Groundwater Monitoring, Phelps Dodge Sierrita, Inc. - Mitigation Order onConsent, Docket No. P-50-06 (PDF file - 1 page)

2007

12/28/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06, September 30, 2007, through December 31, 2007, Status Report (PDF file - 2 pages)
12/28/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Final Aquifer Characterization Report, Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF files) (Part A - 56 pages) (Part B - 8 pages) (Part C - 44 pages) (Part D -201 pages) (Part E - 238 pages) (Part F - 320 pages) (Part G - 136 pages)
12/28/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Focused Feasibility Study, Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF files) (Part A - 83 pages) (Part B - 52 pages)
12/20/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Groundwater Monitoring Report, Fourth Quarter 2007, Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 437 pages)
11/16/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06; Revised Interceptor Wellfield Report (PDF files) (Part A - 68 pages) (Part B - 103 pages)
10/26/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06; Request to Cancel Community Advisory Group Meeting (PDF File - 1 page)
9/28/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06 July 1, 2007 through September 30, 2007 Status Report (PDF File - 2 pages)
9/27/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Groundwater Monitoring Report, Third Quarter 2007, Phelps Dodge Sierrita, Inc. - Mitigation Order on Consent No. P-50-06 (PDF files) (Part A - 31 pages) (Part B - 30 pages) (Part C - 618 pages)
9/21/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06 Proposed Project Schedule Revision/Notice of Force Majeure (PDF File - 2 pages)
6/29/07	Letter from Chad Fretz, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06 – April 1, 2007 through June 30, 2007 Status Report (PDF file - 2 pages)
6/28/07	Letter from Chad Fretz, PDSI, to Robert Casey, ADEQ; Groundwater Monitoring Report, Second Quarter 2007, Phelps Dodge Sierrita, Inc. - Mitigation Order on Consent No. P-50-06 (PDF files) (Part A - 95 pages) (Part B - 55 pages) (Part C - 50 pages) (Part D - 50 pages) (Part E - 50 pages) (Part F - 50 pages) (Part G - 51 pages)
5/31/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06, Response to Comments on Evaluation of the Current Effectiveness of the Sierrita Wellfield Report (PDF File - 5 pages)
5/31/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06, Response to Comments on Identification of Potential Interim Actions, Groundwater Monitoring Report, Well Inventory Report (PDF file - 7 pages)
4/17/07	Letter from Cynthia S. Campbell, ADEQ, to Ned Hall, PDSI; Mitigation Order on Consent, Docket No. P-50-06, Evaluation of the Current Effectiveness of the Sierrita Wellfield (PDF file - 3 pages)
3/30/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Groundwater Monitoring Report, First Quarter 2007 Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF files) (Part A - 28 pages) (Part B - 3 pages) (Part C - 97 pages) (Part D - 399 pages)(Part E - 397 pages)
3/30/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06 – January 1, 2007 through March 31, 2007 Status Report (PDF file - 2 pages)
3/12/07	Letter from Robert Casey, ADEQ, to Ned Hall, PDSI; Mitigation Order on Consent, Docket No: P-50-06 – Identification of Potential Interim Actions, Groundwater Monitoring Report, Well Inventory Report (PDF file - 4 pages)
2/27/07	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06 – Evaluation of the Current Effectiveness of the Sierrita Interceptor Wellfield (PDF file - 110 pages)

2006

12/31/06	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Mitigation Order on Consent No. P-50-06 – September 13, 2006 through December 31, 2006 Status Report (PDF file - 2 pages)
12/29/06	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Groundwater Monitoring Report, Fourth Quarter 2006 Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 34 pages)
12/22/06	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ Identification of Potential Interim Actions Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 69 pages)
12/21/06	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ Well Inventory Report Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 85 pages)
11/15/06	Letter from Cynthia Campbell, ADEQ, to John Brack, PDSI; Mitigation Order on Consent, Docket No: P-50-06 – Work Plan (revised work plan approval) (PDF file - 2 pages)
11/13/06	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; Transmittal of Health and Safety plan for Aquifer Characterization Plan - Mitigation Order on Consent, Docket No: P-500-06 (PDF file - 138 pages)
10/31/06	Letter from John D. Brack, PDSI, to Robert Casey, ADEQ; Transmittal of Revised Work Plan Materials Mitigation Order on Consent, Docket No: P-500-06 (PDF file - 53 pages)
10/30/06	Letter from John D. Brack, PDSI, to Robert Casey, ADEQ; Work Plan Addendum and Phelps Dodge Sierrita, Inc. Response to ADEQ Work Plan Comments Mitigation Order on Consent, Docket No: P-500-06 (PDF file - 34 pages)
10/24/06	Letter from John D. Brack, PDSI, to Cynthia Campbell, ADEQ; Revised Schedule for Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 4 pages)
9/22/06	Letter from Robert Casey, ADEQ, to John D. Brack, PDSI; RE: Mitigation Order On Consent No. P-50-06 – Work Plan Response (PDF file - 11 pages)
9/12/06	Letter from Ned Hall, PDSI, to Robert Casey, ADEQ; RE: Mitigation Order On Consent No. P-50-06 – June 15, 2006 through September 13, 2006 Status Report (PDF file - 2 pages)
9/7/06	Letter from John D. Brack, PDSI to Robert Casey, ADEQ; RE: Amendment to Work Plan to Characterize and Mitigate Sulfate with Respect to Drinking Water Supplies in the Vicinity of the Phelps Dodge Sierrita Tailing Impoundment (PDF file - 4 pages)
8/11/06	Letter from John D. Brack, PDSI to Robert Casey, ADEQ; RE: Work Plan Phelps Dodge Sierrita, Inc. – Mitigation Order on Consent, Docket No. P-50-06 (PDF file - 352 pages)
6/15/06	Mitigation Order On Consent, Docket No. P-50-06 in the matter of Phelps Dodge Sierrita Mine (PDF file - 15 pages)