Freedom of Information Act Request – U.S. Army Corps of Engineers

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Cover Page

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Table of Contents

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, List of Tables

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, List of Figures

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, List of Acronyms/Abbreviations

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Glossary

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Executive Summary

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Sections 1.0 -1.7

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, section 2.0- 2.5

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Sections 3.0-3.3.3.3.6

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Sections 4.0-4.3.14

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Sections 5.0-5.3.14

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Sections 6.0-6.3-13

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Sections 7.0-7.4

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, List of Preparers

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, List of References

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Index

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Appendix A, Thematic Reponses to DEIS Comments

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May 24, 2013 NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Draft Work in Progress 2.0, Appendix B, Underground Mining, Alternative Assessment for NorthMet Mining Project and Land Exchange Environmental Impact Statement

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November 2013, NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Volume I (of II), Prepared by the Minnesota Department of Natural Resources, Untied States Army Corp of Engineers and the United States Forest Service

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November 2013, NorthMet Mining Project and Land Exchange Report. Preliminary Supplemental Draft and Environmental Impact Statement (PSDEIS), Volume II (of II), Prepared by the Minnesota Department of Natural Resources, Untied States Army Corp of Engineers and the United States Forest Service

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May 2, 2012, GoldSim Model Evaluation Work Plan NorthMet Project, Minnesota, ERM Final for NorthMet Project Supplemental Draft Environmental Impact Statement.

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May 3, 2013 Email correspondence from Fred Marinelli of Interralogic Inc about attachments documents pertaining to the Task 1 QA (model inputs).

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February 2, 2012 Correspondence from Fed Marinelli to Dave Blaha about Task 1 (input) evaluation of the Mine Site GoldSim model. Found four instances where values didn’t match up.

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Document of Task 1 (input) Evaluation for Mine Site GoldSim Model

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Document of Task 1 (input) Evaluation for Mine Site GoldSim Model

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February 25, 2013 correspondence from Fred Marinelli, Houston Kempton, John Adams and David Blaha about NorthMet Mining Project GoldSim Water Quality Model – Phase 3 Quality Assurance

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May 8, 2012, Technical Memorandum from Interralogic Inc to David Blaha (ERM) about Plant Site GoldSim Model (Base v01) Task 1 QA Evaluation

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April 5, 2013 Correspondence from United States Environmental Protection Agency to Bill Johnson of the Minnesota Department of Natural Resources, Tom Hale of the United States Forest Service and Thomas Hingsberger of the United States Army Corps of Engineers about GoldSim water model and concerns over adequate mitigation of impacts to wetlands.

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January 25, 2012 Email Correspondence from Stuart Arkley of the DNR pertaining to the most recent draft of the QA/QC that was prepared by ERM at the request of the Co-lead agencies.

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June 12, 2013 Email Correspondences between Bill Johnson (DNR), ERM and all co-lead agencies pertaining to FEIS and on record that the GoldSim model adequately documented by ERM for use in SDEIS

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Comments Document from United States Environmental Protection Agency

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Document, ERM response to Comments from United States Environmental Protection Agency

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Comments Document from United States Environmental Protection Agency

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July 18, 2012 Technical Memorandum from Tina Pint of Barr summarizing the model assumptions and engineering controls associated with the AWMP that are contained with the Mine Site and Plant Site GoldSim models.

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July 20, 2012 Email Correspondence from Michael Liljegren of MN DNR Waters pertaining to the agency responses to comments on the Summary of Calibrations and Plant Sites Corroboration Document version one.

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July 24, 2012 Email correspondence from Lisa A. Ungar at Barr about version two of the Summary of Calibrations and Plant Site Corroboration.

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August 14, 2012 Email correspondence from Michael Liljegen (DNR) review of Summary of Calibration and Corroboration Memo V2.

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November 29, 2011 Email correspondence from Fred Marinelli about concerns that the proposed concentration cap and scaling factor inputs might be overly conservative from a probabilistic modeling standpoint.

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September 4, 2012 Email correspondence from David Blaha about Cat 1 stockpile “flush” and large and small fragment oxidizing.

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September 4, 2012 Email correspondence from Jim Scott about Cat 1 stockpile “flush” and questions about percentages.

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July 18, 2012 Email correspondence from Fred Marinelli about Cat 1 stockpile pH about updated package posted on Barr website and model files submitted 2 weeks ago did not have the pH of the Category 1 Waste Rock Stockpile modeled correctly.

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March 16, 2013 Document Co-lead Agencies Comment/Response Review Meeting and outcomes.

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April 24, 2012 Email correspondence from David Blaha about co-variance question pertaining to the waste rock pH.

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Chart of Coarse Flotation Trailings, S04 release rate distribution

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January 4 2012 Email correspondence from Stuart Arkley (DNR) about names involved in co-lead QA/QC development and plan implementation.

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July 2, 2012, Flow Charter of GoldSim Model, NorthMet Mine Site Water Quality Model

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July 27, 2012 Email correspondence from Fred Marinelli about Mine Site Control Volumes for Mine Site flow chart.

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July 27, 2012 Email correspondence from Fred Marinelli about Plant Site Control Volumes and the issue of pond water balance is not consider but percolation from pond into tailings is consider.

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August 6, 2012 Email correspondence from Fred Marinelli about defining Control Volumes.

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August 7, 2012 Email correspondence from Peter Hinck about flow charts for Northmet Mine Site Control Volumes.

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August 8, 2012 Email correspondence from Peter Hinck about flow charts for Northmet Mine Site Control Volumes and neglecting to add calculation points on the upstream and downstream end of the non-West Pit surficial flowpaths.

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August 2012 Charts of AWMP Ver 2 Model QA/QC

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April 12, 2012 Email correspondence from David Blaha about Plant Site Work Plan and Data Package review.

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January 5, 2012 Email correspondence from Stuart Arkley about addressing the DNR’s comments on the 12/23 draft of the QA/QA document. Comments stem from lack of clarity in the first draft.

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March 13, 2012 Email correspondence from Al Trippel about NorthMet ERM feedback on Water QAP EPA comments.

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January 17, 2012 Email correspondence from Fred Marinelli about feedback regarding the EPA checklist used to review Barr QAPP.

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March 3, 2013 Document EPA Question/Comments on GoldSim Model Review.

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September 8, 2011 Document EPA Information Request

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April 5, 2013 Correspondence from United States Environmental Protection Agency to Bill Johnson of the Minnesota Department of Natural Resources, Tom Hale of the United States Forest Service and Thomas Hingsberger of the United States Army Corps of Engineers about GoldSim water model and concerns over adequate mitigation of impacts to wetlands. Includes comments and responses.

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October 30, 2012 Email Correspondence from Bill Johnson of the DNR about next round of the co-lead agencies’ QA/QC procedure conducted by ERM on the GoldSmim model developed for PolyMet’s NorthMet Project for both the Plant and Mine Site.

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Chart showing Fine Floatation Tailings (-200) SO4 release rate distribution

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Hand drawn chart for stockpile models

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August 29, 2012 Email correspondence from Fred Marinelli about concern over technical justification for using a diffusion coefficient pertaining to the bentonite-amended layer and an O2 consumption rate for oxygenated materials in the non-amended NM tailings below the benotonite layer.

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Document Sulfate Generation – Cell 2W Fine, equations correlating to tables

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August 16, 2012 Email Correspondence from Fred Marinelli about a suggestion to eliminate lateral flow issues associated with long-term closures.

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August 16, 2012 Email Correspondence from Tina Pint about Fred Marinelli’s suggestion to eliminate lateral flow issues associated with long-term closures.

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August 15, 2012 Email Correspondence from Fred Marinelli about meeting to discuss FTB groundwater modeling.

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October 9, 2012 Email Correspondence from Fred Marinelli about materials used in FTB related to the construction of new dams and embankments.

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October 9, 2012 Email Correspondence from Fred Marinelli about materials used in FTB for the North Damn and LTC coarse tailings for the Cell 2W embankment.

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October 11, 2012 Email Correspondence from Fred Marinelli about materials used in FTB and completing table.

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October 11, 2012 Email Correspondence from Fred Marinelli about materials used in FTB and completing table.

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July 27, 2012 Email Correspondence from Fred Marinelli about seepage flow rate and sulfate concentration at the north toe of the FTB.

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August 31, 2012 Email Correspondence from Fred Marinelli about Mathcad worksheet computes sulfate concentration in seepage from Cell 2W fines and GoldSim output of sulfate concentration for the 2W fine subera.

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Chart Plant Site Base Model Annual Infiltration in the North Beach

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July 18, 2012 email correspondence from Tina Pint of Barr about the AWMP assumptions/model inputs that were included in the GoldSim models that were provided to the co-lead agencies for July 5, 2012 review.

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May 2, 2012 Report, GoldSim Model Evaluation Work Plan NorthMet Project, Minnesota, ERM Final

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January 12, 2011 email correspondence from Bill Johnson of the DNR about recommendations for adding GoldSim qualified individuals to the team.

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February 4, 2013 email correspondence from Bill Johnson of the DNR about using ERM resources to provide access for the Cooperating Agencies to the lastest versions of PolyMet/Barr’s GoldSim model and outpust for both the Mine and Plant Sites.

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July 5, 2012 email correspondence from Cory Anderson of Barr about Version 1 of the Mine Site and Plant Site GoldSim posted to the project “Water Model Results Website.”

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December 21, 2012 Email correspondence from Bill Johnson about availability of updated GoldSim Mind Site model and player files.

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August 15, 2012 Email correspondence from Fred Marinelli about meeting with Barr to give an overview of 3-D modeling to evaluate the FTB groundwater capture system.

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October 9, 2012 Email correspondence from Fred Marinelli about GoldSim inputs to Plant Site model and review request.

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October 9, 2012 Email correspondence from David Blaha about GoldSim inputs to plant site model and confirmation on inputs.

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October 16, 2012 Michael Kunz of the DNR about GoldSim inputs to plant site model and the need for some form of documenting areas yet-to-be determined.

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November 9, 2012 Email correspondence from Fred Marinelli about GoldSim inputs table updates.

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November 9, 2012 Email correspondence from Bill Johnson about GoldSim model for Version 4 of GoldSim Input Tables that would include revised workplan data input tables, GoldSim model codes and CV drawings.

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November 12, 2012 Email correspondence from Bill Johnson about GoldSim input tables request and delivery of version 4.

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October 9, 2012 email correspondence from David Blaha about GoldSim inputs to plant sit model and ERM confirming inputs.

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October 9, 2012 Email correspondence from Bill Johnson about Water Modeling Workplan and process boundaries established between QA/QC and CDF/ECs processes.

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October 15, 2012 Email correspondence from Bill Johnson about the most recent version of the Plant Site Workplan table details.

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October 17, 2012 Email correspondence from Bill Johnson about NorthMet GoldSim QA/QC Tracking October 2, 2012 document provided by Tina Pint at Barr in response to the confirmation sought by ERM regarding values contained in Table1-22 of the Plant Site Water Modeling Workplan version seven.

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October 13, 2011 Email correspondence from Steve Colvin of the DNR about including Michael Liljegren from MN DNR Waters in the EPA/Barr PolyMet meetings about GoldSim inputs.

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September 30, 2012 Email correspondence from Peter Hinck of Barr about NorthMet GoldSim model version 3 posted to project website.

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April 15, 2013 Email correspondence from Peter Hinck of Barr about clarification of EPA’s comments on groundwater.

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February 2, 2012 Email correspondence from David Blaha of ERM about problems with the Plant Site model.

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February 25, 2013 Email correspondence from Bill Johnson of the DNR about acknowledging availability of NorthMet Mine Site and Plant Site Models (Version 5) on the Barr FTP site for review and comment by cooperating agencies.

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February 25, 2013 Email correspondence from Bill Johnson about comment forms for the model and the spreadsheets of GoldSim Mine Site and Plant Site Models.

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March 11, 2013 Email Correspondence from Peter Hinck about PolyMet GoldSim Model Review Period Check-ins for March 13, 2013 discussion/presentation topics.

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March 26, 2013 Email Correspondence from Bill Johnson of the DNR about EPA’s Comments/Question for the Next GoldSim Meeting.

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April 5, 2013 Email Correspondence from David Blaha about meeting to discuss EPA’s comments on the GoldSim Model

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April 5, 2013 Email Correspondence from Bill Johnson about setting up meeting to discuss EPA’s comments on the GoldSim model.

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April 5, 2013 Email Correspondence from Bill Johnson about review of EPA’s comments on the GoldSim model.

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April 9, 2013 Email Correspondence from Tina Pint about addressing EPA’s comments on the GoldSim Model and identifying areas where a sensitive analysis may address some issues.

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April 12, 2013 Email Correspondence from Peter Hinck about addressing EPA’s comments on the GoldSim Model and output information from an extreme case run of the Mine Site model.

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April 14, 2013 Email Correspondence from Peter Hinck about addressing EPA’s comments on the GoldSim Model and Barr’s responses.

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April 15, 2013 Email Correspondence from Peter Hinck about clarification on EPA’s comments on the Barnes’ program calculations.

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April 15, 2013 Email Correspondence from Bill Johnson about clarification on EPA’s comments on the Barnes’ program calculations.

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April 16, 2013 Email Correspondence from Peter Hinck about Mine Site Output for EPA comments number six.

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April 16, 2013 Email Correspondence from Bill Johnson about meeting agenda for Co-lead agencies.

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April 17, 2013 Email Correspondence from Bill Johnson about getting feedback prior to meeting for Co-lead agencies.

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April 23, 2013 Email Correspondence from Bill Johnson about meeting follow-up action items from co-lead meeting to consider ERA Treaty Authority Comments on GoldSim Model.

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May 7, 2013 Email Correspondence from Bill Johnson about EPA’s list of components for QA/QC for the GoldSim model.

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January 20, 2013 Email Correspondence from Peter Hinck about checking the GoldSim model inputs match the values in the Mine Site modeling workplan documentation.

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October 1, 2013 Email Correspondence from Tina Pint about GoldSim plant site model delay in finalizing.

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July 6, 2013 Email Correspondence from Erik Carlson about NorthMet EIS Agency Water Model Results Check and ERM QA/QC Task I and Task II workplan.

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February 25, 2013 Email Correspondence from Tina Pint about status of models for posting if nothing needs to be addressed for ERM’s QA/QC review.

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February 25, 2013 Email Correspondence from Bill Johnson about final set of QA/QC documentation prepared by ERM on the Mine and Plant Sites’ GoldSim Models.

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February 25, 2013 Email Correspondence from Bill Johnson about final set of QA/QC documentation prepared by ERM on the Mine and Plant Sites’ GoldSim Models and file name correction.

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February 25, 2013 Email Correspondence from Bill Johnson about QA/QC of GoldSim Models and the overall conclusion that the V5 GoldSim models are functionally accurate.

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February 26, 2013 Email Correspondence from Bill Johnson following up on QA/QC of GoldSim Models.

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February 27, 2013 Email Correspondence from Bill Johnson about follow up on QA/QC of GoldSim Models.

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May 8, 2013 Email Correspondence from Al Trippel about review of CDF documents about comprehensive/complex data package for QA/QC.

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May 9, 2013 Email Correspondence from Erik Carlson of the DNR about comprehensive review results of QA/QC.

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May 23, 2013 Email Correspondence from Erik Carlson of the DNR about meeting to discuss QA/QC Plant Site Task 1.

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July 23, 2013 Email Correspondence from Al Trippel about moving forward on QA/QC process and ERM’s attempt to complete Task I and II QA/QC.

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July 23, 2013 Email Correspondence from Al Trippel about schedule issues and PolyMet debugging their model.

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July 31, 2013 Email Correspondence from Al Trippel about logistics of QA/QC efforts.

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August 2, 2013 Email Correspondence from Fred Marinelli about total number of control volumes (CVs) and calculations points (CPs) for each site model.

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August 2, 2013 Email Correspondence from Peter Hinck about QA/QC tracking and issues identified.

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August 2, 2013 Email Correspondence from Peter Hinck about model files posted to website and request to use new model files for ongoing QA/QC.

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August 2, 2013 Email Correspondence from Fred Marinelli about total number of control volumes (CVs) and calculations points (CPs) for each site model.

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August 2, 2013 Email Correspondence from Peter Hinck about issues identified and paths forward for mine site models for QA/QC.

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January 22, 2013 Email Correspondence from Tina Pint about another QA/QC step performed by ERM on the Mine Site model.

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August 17, 2013 Email Correspondence from Peter Hinck about updated models on website and documentations.

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August 17, 2013 Email Correspondence from Cory D. Anderson of Barr about Plant Site model updated on website and tracking spreadsheets.

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November 13, 2013 Email Correspondence from Cory D. Anderson of Barr about Mine Site and Plant Site model zip files and results zip files on project website.

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November 18, 2011 report Model Evaluations Plans: NorthMet Project Water Quality, Draft, Houston Kempton

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December 23, 2011 report Water Model Evaluations Plans, NorthMet Project, Revised Draft.

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December 23, 2011 report, Dynamic Systems Model Evaluation Work Plans, NortheMet Project, Revised draft (marked copy).

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December 12, 2013 Email Correspondence from David Blaha with summary of meeting notes.

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September 6, 2013 Email Correspondence from Fred Marinelli about current schedule for completion of Task 2 – Phase 1 QA review on September 10, 2013 and the work that needs to be completed.

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March 23, 2013 Email Correspondence from Tina Pint about concerns of the GoldSim Model Evaluation and the benefits of talking through issues before they become part of public record.

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October 15, 2013 Email Correspondence from Fred Marinelli about question on the new value for sulfur on Table 1-22 from the most recent version of the Plant Site Workplan

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August 8, 2013 Email Correspondence from Bill Johnson about background document prepared by PolyMet to support a better team understanding of the GoldSim Model.

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August 31, 2013 Email Correspondence from Fred Marinelli about complexity of GoldSim model and creating a better understanding for team.

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August 31, 2013 Email Correspondence from Fred Marinelli about including more engineered features in GoldSim Quality Assurance.

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September 04, 2013 Email Correspondence from Erik Carlson of the DNR about PolyMet’s removal of the passive treatment technologies from their modeled project.

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September 05, 2013 Email Correspondence from Erik Carlson about re-running the model and schedule of next review.

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July 26, 2013 Email Correspondence from Erik Carlson about communicating directly with Barr to complete QA/QC process as efficiently as possible.

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April 25, 2013 Email Correspondence from Erik Carlson about requesting information that will be useful for reviewing of model results.

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April 26, 2013 Email Correspondence from Erik Carlson asking to ignore his last email about the info request.

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January 24, 2012 Email Correspondence from Al Trippel about Dave Blaha managing the ERM team review on water documents.

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July 21, 2013 Email Correspondence from Erik Carlson of DNR about QA/QC process and about potential errors and documentation of ERM-specified calculations. Suggests that ERM provide possible errors to Barr.

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August 2, 2013 Email Correspondence from Peter Hinck from Barr about QA/QC tracking and issues identified.

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February 25, 2013 Email Correspondence from David Blaha about trying to reconcile independent calculations.

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January 5,2012 Email Correspondence from Stuart Arkley about DNR’s comments on the QA/AC documents calling for more clarity.

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January 30, 2012 Email Correspondence from Tina Pint about Model Input Review steps.

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April 24, 2012 Email Correspondence from Houston Kempton about revised Q/A Phase I and II workplan evaluation plan.

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April 24, 2012 Email Correspondence from Erik Carlson about revised Q/A Phase I and II workplan comments 18 and 19 needing resolution.

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December 2, 2011 Email Correspondence from Stuart Arkley about ERM model evaluation plan for GoldSim based modeling.

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December 3, 2011 Email Correspondence from Jim Scott about possible correction to ERM Model Evaluation Plan for GoldSim.

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December 23, 2011 Email Correspondence from Stuart Akley about ERM submitting Version2 of the agency QA/QC plan for hydrologic and geochemical modeling.

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July 18, 2012 Email Correspondence from Fred Marinelli of Interralogic Inc. about GoldSim models questions.

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July 19, 2012 Email Correspondence from Cory D. Anderson explaining aspects of GoldSim models calculations.

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July 21, 2012 Email Correspondence from Fred Marinelli pertaining to GoldSim models calculations.

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December 10, 2012 Email Correspondence from Tina Pint from Barr about NorthMet Required Model updates.

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January 24, 2012 Email Correspondence from Al Trippel about Dave Blaha managing the ERM team review on water documents.

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June 12, 2013 Email Correspondence from Bill Johnson of DNR about co-lead agencies not requesting any formal ERM Water Team review of documentation.

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April 26, 2012 Email Correspondence from Peter Hinck from Barr about asketch that shows what the flowchart should look like for structure meeting.

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April 27, 2012 Email Correspondence from Fred Marinelli about scheduling with team for structure meeting.

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June 11, 2012 Email Correspondence from Cory D. Anderson of Barr about Barr’s response to comments for review of Plant Site Model Base v01.

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June 11, 2012 Email Correspondence from Melinda Todorov of Environmental Resources Management about Interralogic’s follow up comments to Barr’s response to comments on Task 1 QA for Plant Site.

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June 1, 2011 Email Correspondence from Bill Johnson of DNR about ERM GoldSim participants for meeting/presentation.

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June 24, 2011 Email Correspondence from David Blaha about the need to use probabilistic modeling over using GoldSim specifically.

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January 24, 2012 Email Correspondence from David Blaha about GoldSim Water Modeling process flow chart.

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August 5, 2011 Email Correspondence from Al Trippel about the viability of Barr’s approach to using the GoldSim model and Fred Marineli’s review of the NorthMet workplan.

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Document, PolyMet GoldSIm Model, Mine Site Model Comment Form.

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Document, PolyMet GoldSIm Model, Mine Site Model Results Spreadsheet Comment Form.

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Pages from GoldSim User’s Guide, Chapter 10: Advanced Modeling Concepts.

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July 2, 2012 NorthMet Mine Site Water Quality Model, Draft detailed Model Flowchart 2, GoldSim Model, Version 1.

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Document, Cat 1 Sulfate Mass Flux to West Pit after Installing of Geomembrance Cover.

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July 23, 2012 Email Correspondence from Erik Carlson of the DNR about the Minnesota Center for Environmental Advocacy (MCEA) retaining a consultant, Tom Myers to review the NorhtMet EIS water modeling documentation.

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May 8, 2012, Technical Memorandum from Interralogic, Inc to David Blaha at ERM about Plant Site GoldSim Model (Base v01) Task 1 QA Evaluation/Comments.

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July 27, 2012 Email Correspondence from Fred Marinelli about mine site CVs.

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July 29, 2012 Email Correspondence from Peter Hinck about mine site CVs and CPs.

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July 31, 2012 Email Correspondence from Al Trippel about Mine Site CVs and CPs and questioning the value in completely stopping QA/QC efforts.

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July 31, 2012 Email Correspondence from Al Trippel about Mine Site CVs and CPs and questioning the value in completely stopping QA/QC efforts.

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July 27, 2012 Email Correspondence from Fred Marinelli about mine site control volumes.

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July 21, 2012 Email Correspondence from Fred Marinelli about flow, concentration and chemical flux from Cat 1 stockpile and problems with reproducing sulfate values.

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February 1, 2012 Email Correspondence from David Blaha about mine site model updates and reference to not major problems, only minor problems.

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January 31, 2013 Email Correspondence from Cory D. Anderson of Barr about Mine Site model uploaded to the Barr project website.

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February 1, 2012 Email Correspondence from David Blaha about results from Phase I Mine Site Model Input Evaluation.

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February 2, 2012 Correspondence from Fred Marinelli about completing the Task I input evaluation of Mine Site GoldSim Model. Four discrepancies found.

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Table, Task 1 (input) Evaluation for Mine Site GoldSim Model

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Table, Task 1 (input) Evaluation for Mine Site GoldSim Model

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February 2, 2012 Correspondence from Fred Marinelli about completing the Task I input evaluation of Mine Site GoldSim Model. Four discrepancies found.

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June 20, 2012 Correspondence from Fred Marinelli about r equests made to Barr for updated work plan, date package and model impact results. Teleconference meeting proposed.

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December 18, 2011 Email Correspondence from Peter Hinck about comments on the GoldSim model evaluation plans.

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