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Jim Pinasco <br /> June 21, 1994 <br /> Page 8 <br /> horizons. Figure 5-2 shows TCE concentrations in ground water in <br /> the Upper hydrogeologic horizon. Therefore, LM48A does not <br /> belong on Figure 5-2 . <br /> The Report states "contamination around L2417A appears to be <br /> separate from the main TCE plume to the north, as evidenced by <br /> the lack of TCE detection in the samples from wells LM23A and <br /> LM10OA, which are downgradient of LM17A. " However, 1141O0A is not <br /> shown on Figure 5-2 . <br /> Recommendations <br /> The text of the Report should be revised to reference the <br /> wells that are screened in the Upper hydrogeologic horizon to <br /> support the statement that the TCE plume at LM 37A is not <br /> connected to the TCE to the north. In addition, the location of <br /> LM48A and respective TCE concentration should be added to Figure <br /> 5-1 (Trichloroethene Concentrations and Potential Source Areas in <br /> Above Upper Horizon Groundwater) . L1438A should not be used to <br /> define the extent of the TCE plume because it is screened in both <br /> the Above Upper and Upper hydrogeologic horizons. LM100A should <br /> be added to Figure 5-2 to support the statement contamination <br /> around LM17A appears to be separate from the main TCE plume to <br /> the north. <br /> 11. Extent of TCE and PCE Contamination, Section 5. 1.1. 6, page <br /> 5-3 <br /> The Report discusses extent of tetrachloroethene (PCE) <br /> contamination in the Upper Horizon and references LMBA. However, <br /> LMBA is screened in the Above Upper hydrogeologic horizon, not <br /> the Upper hydrogeologic horizon. <br /> Recommendations <br /> The discussion of LMBA should be moved to the section of the <br /> Report that discusses PCE contamination in the Above Upper <br /> hydrogeologic horizon, not the Upper hydrogeologic horizon <br /> section. <br /> 12 . Extent of TCE and PCE Contamination, Section 5. 1. 1.7, page <br /> 5-4 and Figure 5-3 , Trichloroethene (TCE) Concentrations, <br /> October 1993, (Middle Horizon) <br /> MSAI <br /> M563.064/10B <br />