Laserfiche WebLink
EPA Comments on the <br /> Sharpe Site <br /> Draft Evaluation of Proposed Extraction Well Shutdown <br /> Technical Memorandum <br /> July 2002 <br /> GENERAL COMMENT <br /> 1. The Technical Memorandum may not meet the intent of the National Contingency Plan <br /> (NCP) because it does not consider the effect of the proposed extraction well shutdowns <br /> on the time to clean up the contaminant plumes at the Sharpe facility. The Technical <br /> Memorandum states in the Introduction in Section 1 that the Record of Decision (ROD) <br /> does not specify a time frame for reaching remedial action objectives, and the cleanup <br /> time is not considered in the analysis in Sections 3 and 4. However, the NCP at 40 CFR <br /> 300.430(a)(ii)(F) indicates that, "EPA expects to return usable ground waters to their <br /> beneficial uses wherever practicable, within a time frame that is reasonable given the <br /> particular circumstances of the site." In addition, the Interim Remedial Action Report for <br /> Operable Unit 1 Groundwater at DDJC-Sharpe indicated that the operational period <br /> included in the ROD of 16 years to restore groundwater to beneficial use may actually <br /> take 50 years or more,based on groundwater modeling by the Waterways Experiment <br /> Station. Any further delays resulting from extraction well shutdown may result in <br /> unreasonably long cleanup time. Please revise the Technical Memorandum to estimate <br /> the approximate delay in achieving remedial action objectives as a result of the proposed <br /> extraction well shutdowns, and state whether the resulting time frame for cleanup can still <br /> be considered reasonable. <br /> SPECIFIC COMMENTS <br /> 1. Section ES.1, Executive Summary, Page 1: The text states that "DDJC and regulatory <br /> agency personnel agreed on 24 July 2002 to shut down 10 extraction wells." In fact, the <br /> agreement occurred on 24 June 2002. Please correct the date in the next version of the <br /> Technical Memorandum. <br /> 2. Section 1.2, Introduction, Page 2: This section states that not all extraction wells were <br /> shut down on the same day, so that they will reach their 60-day limit on different days, <br /> but does not specify when they were each shut down. Please provide a table that lists each <br /> well, the date it was shut down, and the date the 60-day limit expires. <br /> 1 <br />