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Background, Development and Contents of the PHC/CHIA Technical Reference Document Deborah Dale, Hydrogeologist OSM-MCR Alton, Illinois.

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Presentation on theme: "Background, Development and Contents of the PHC/CHIA Technical Reference Document Deborah Dale, Hydrogeologist OSM-MCR Alton, Illinois."— Presentation transcript:

1 Background, Development and Contents of the PHC/CHIA Technical Reference Document Deborah Dale, Hydrogeologist OSM-MCR Alton, Illinois

2 Topics: What is the PHC/CHIA reference document? Background into the development of the document Contents

3 What is the PHC/CHIA reference document?

4 Hydrologic Considerations for Permitting and Liability Release Probable Hydrologic Consequences (PHC) Determination Cumulative Hydrologic Impact Assessment (CHIA) Post-Mining Hydrologic Assessment (PHA) Technical reference for the MCR Technical reference for the MCR Distributed by the Mid-Continent Technology Development and Transfer Team Distributed by the Mid-Continent Technology Development and Transfer Team

5 To provide a systematic approach within the MCR for the review and development of PHCs & CHIAs Purpose of the document: Insight into the regulatory basis for bond release and post-reclamation hydrologic balance Authors of the document: Brian Hicks, OSM-MCR Wayne VanBuren, ADEQ Timothy Walter, TX RRC Deborah Dale, OSM-MCR

6 Background into the development of the guidance document

7 The Determination of Probable Hydrologic Consequences and The Statement of the Results of Test Borings or Core Sampling Milestones in the Development of PHC/CHIA Guidance Documents May 1980

8 DRAFT Guidelines for Preparation of a Probable Hydrologic Consequences Determination (PHC) Milestones in the Development of PHC/CHIA Guidance Documents December 1985 DRAFT Guidelines for Preparation of a Cumulative Hydrologic Impact Assessment (CHIA) DRAFT Appendices to PHC and CHIA Guidelines Documents

9 DRAFT Managing Hydrologic Information: A Resource for Development of Probable Hydrologic Consequences (PHC) and Cumulative Hydrologic Impact Assessment (CHIA) Milestones in the Development of PHC/CHIA Guidance Documents January 1997

10 OSMs Hydrologic Issues Team releases to the states for review and comment a Phase I guidance document for baseline data (draft) Hydrologic Issues Team meets with states to review a draft outline for a Phase II guidance document for writing PHCs and CHIAs (Austin) Milestones in the Development of PHC/CHIA Guidance Documents August 1999 April 2001

11 Following the Austin meeting, several states raised concerns through the Interstate Mining Compact Commission (IMCC) about OSMs proposed approach A main concern was that the preparation of any guidance document would carry a requirement for mandatory use rather than discretionary use Milestones in the Development of PHC/CHIA Guidance Documents

12 The IMCC and the Western Interstate Energy Board (WIEB) requested, and OSM agreed, to defer additional work on Phase II PHC/CHIA guidance until a State-Federal workshop on this subject could be held and the results assessed. Milestones in the Development of PHC/CHIA Guidance Documents March 2002 Intergovernmental Benchmarking Workshop on PHC/CHIAs (New Orleans)

13 topics relating to PHC/CHIA permitting hydrology (either concerns, issues or merely areas of interest) were identified during the course of the workshop (57) topics relating to PHC/CHIA permitting hydrology (either concerns, issues or merely areas of interest) were identified during the course of the workshop Milestones in the Development of PHC/CHIA Guidance Documents

14 Draft Methodology for Review and Preparation of PHC Determinations and CHIAs in the Mid- Continent Region January 2006

15 Technical Reference for the Mid-Continent Region: Hydrologic Considerations for Permitting and Liability Release Probable Hydrologic Consequences (PHC) Determination Cumulative Hydrologic Impact Assessment (CHIA) Post-Mining Hydrologic Assessment (PHA) Distributed by the Mid-Continent Technology Development and Transfer Team September 2006 Draft

16 Hydrologic Considerations for Permitting and Liability Release Probable Hydrologic Consequences (PHC) Determination Cumulative Hydrologic Impact Assessment (CHIA) Post-Mining Hydrologic Assessment (PHA)

17 This guidance document has (4) main sections: Probable Hydrologic Consequence (PHC) Hydrologic Reclamation Plan (HRP) Cumulative Hydrologic Impact Assessment (CHIA) Post-Mining Hydrologic Assessment (PHA)

18 Probable Hydrologic Consequences (PHC) Determination Addresses the anticipated effects of the planned mining and reclamation on the quality/quantity of sw and gw systems Determine if AFM are present Describe and characterize the subsurface strata Overburden properties

19 Disposal/storage operations Non-coal waste Spoil Coal processing waste Coal combustion byproducts - PHC -

20 PHC - Erosion and sediment control

21 PHC - Mining methods

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24 PHC - Coal-bed methane recovery

25 Hydrologic Reclamation Plan (HRP) Detailed description of how to: 1)Minimize impacts to sw & gw systems within and adjacent to the permit area; and 2) Prevent material damage outside the permit area *HRP must include mitigation plans for hydrologic impacts - BTCA HRP Elements: AMD generation Controlled placement of overburden Water management Mitigation options

26 HRP Elements (continued) : Non-acidic mine drainage Recharge capacity Disposal activities High TDS (i.e. sulfates, chlorides) Increased sediment loading SW and GW monitoring

27 HRP Elements (continued): Water supply replacement

28 a.k.a. the Chia Pet Cumulative Hydrologic Impact Assessment (CHIA)

29 An assessment of the probable cumulative impacts of all anticipated mining in an area to assure the operation has been designed to prevent material damage to the hydrologic balance outside the permit area

30 Cumulative Hydrologic Impact Assessment (CHIA) An assessment of the probable cumulative impacts of all anticipated mining in an area to assure the operation has been designed to prevent material damage to the hydrologic balance outside the permit area Hydrologic balance: Relationship between the quality/quantity of water flowing into, stored within, and discharging from a unit (i.e. drainage basin, aquifer, lake, etc.)

31 Highlights of the CHIA section: When is a CHIA required? Relationship between PHC and CHIA Prospective mining operations + all existing operations Anticipated mining (30 CFR cumulative impact area)

32 Highlights of the CHIA section (continued): Cumulative Impact Area (CIA) Definition of the CIA Qualitative delineation of the CIA (sw and gw)

33 Highlights of the CHIA section (continued): Cumulative Impact Area (CIA) Definition of the CIA Qualitative delineation of the CIA (sw and gw) Baseline conditions Quantitative check of the working CIA Criteria for evaluating Identification of hydrologic concerns Water quantity issues Changes in water quality

34 Highlights of the CHIA section (continued): Material damage Definition (from previous draft CHIA guidelines, OSM 1985, 1997); examples Functions of material damage criteria (standards, enforcement) Methods for analysis of cumulative hydrologic impacts Statement of findings

35 Post-Mining Hydrologic Assessment (PHA) Regulatory basis for release of performance bonds Post-reclamation hydrologic balance

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37 Appendices: Appendix A: Glossary of water-related words, 153 p Appendix B: Outline of suggested minimum requirements for PHCs Appendix C: Outline of suggested minimum requirements for HRPs Appendix D: Outline of suggested minimum requirements for CHIAs Appendix E: Outline of suggested minimum requirements for PHAs Appendix F: Resources for processes/tools for determining impacts, 17 p (databases, software, training, etc.)


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