ABSTRACT: The U.S. Environmental Protection Agency published 40 CFR 257, Subpart D, the Coal Combustion Residuals (CCR) Rule on April 17, 2015. This Rule includes provisions for groundwater monitoring of active, inactive, and new CCR landfills and impoundments. Various deadlines are set for the establishment of a groundwater monitoring system, the sampling and analysis of groundwater, and the statistical evaluation of groundwater data.

The CCR Rule created three phases of groundwater monitoring that include Detection Monitoring, Assessment Monitoring, and Corrective Action Monitoring. Groundwater protection standards will need to be developed based upon maximum contaminant levels (MCLs) or background levels. Criteria that trigger these phases of monitoring include a statistically significant increase (SSI) and a statistically significant level (SSL). If SSLs are determined in Assessment Monitoring, then the nature and extent of a release must be determined and a corrective action remedy developed. Reporting requirements that need to be a part of the operating record and/or posted to the public internet site are established.

This presentation will provide an overview of upcoming CCR Rule requirements and corresponding deadlines. In addition, selected case studies of current CCR monitoring system designs including single units and multi-units with interconnected hydraulic water-bearing units, sampling and analysis programs, and data quality management challenges will be described.

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