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Probable Hydrologic Consequences (PHC) and Cumulative Hydrologic Impact Assessments (CHIA), Baseline Data

By The Office Of Surface Mining


This PHC/CHIA technical reference document provides a technically sound approach for obtaining geologic and hydrologic information to be used in the review and preparation of coal mine permit applications. The document represents a snapshot in time- thus; it is subject to revision at some future date. While we believe the document represents a sound technical, good-science approach for permit reviewers, CHIA preparers and policy makers, it does not have the power of regulation, and we are not requiring its use by regulatory authorities (RAs). As we discuss in the introduction, the requirements for both PHC and CHIA are set forth as performance standards in the Surface Mining Control and Reclamation Act (SMCRA). Regulators choose how best to meet those standards. They may choose to follow the guidance in this document, or they may adopt an alternative combination of specifications, verifications and controls for hydrologic and geologic baseline data. Whatever approach is chosen, it must provide a framework for technically and scientifically sound and supported hydrologic impact analyses, and it must ensure the hydrologic performance standards of SMCRA are met. Although this document describes a sound technical approach for meeting baseline requirements for PHCs and CHIAs, there will be cases in which either more or less baseline data ar

Topics: ii
Year: 2011
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