The client’s five coal-fired power plants have historically used impoundments/landfills to contain their Coal Combustion Residuals (CCR). Over 10 of the CCR units are regulated under the Federal CCR Rule and are required to perform groundwater monitoring. Four of the units are also subject to state-required monitoring, corrective action, and reporting. The client’s objectives are to:
During 2017, TRC managed the groundwater monitoring program, coordinated with subcontractors, collected background groundwater quality data from the monitoring wells, managed the data in EQUIS®, performed data QA/QC, developed preliminary and final statistical evaluation plans using groundwater data following the RCRA Unified Guidance, and evaluated groundwater data trends. TRC developed conceptual site models (CSMs) for each site to support management decisions related to impoundment
closures and longer term risk management. TRC is also supporting compliance with state requirements, including evaluating groundwater data to determine the potential need for corrective action under the
state cleanup program.
Background data collection was completed by October 17, 2017, with the groundwater monitoring well networks and planned statistical evaluation certified by a professional engineer. TRC is developing statistical evaluation plans for each unit in accordance with the performance standards of the CCR Rule. Groundwater data collected after October 1, 2017 will be evaluated to determine if an SSI is observed; the initial annual groundwater monitoring report is due on January 31, 2018.
TRC is also evaluating groundwater quality and geochemical indicators to ascertain the potential for SSI’s to occur and making recommendations for additional data gathering activities to support alternative source demonstrations (ASDs) if needed.
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