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18. Table 6.5-1: The table indicates that for EW035AU and EW037AU, no sampling is <br /> proposed in 2001 because the wells are not operating due to poor performance. <br /> Non-operation of a well does not preclude the possibility of sampling the well. Wells can <br /> be sampled by bailer, portable pumps, temporary operation of the installed pumps, or by <br /> other methods. Please provide another rationale for the exclusion of wells EW035AU and <br /> EW037AU from the 2001 sampling plan, or revise the proposed 2001 Sampling Plan to <br /> include these two wells. In addition, please indicate how the performance of these wells <br /> will be improved. <br /> 19. Appendix H, Capture Zone Maps, Figures 5.3-1 through 5.34 and Section 5, Pages <br /> 5-1 through 5-6: In Figures H-1 through H-12 and 5.3-1 through 5.3-4, capture zone <br /> limits were not consistently drawn around all pumping extraction wells. Please revise the <br /> Figures to show capture zones around all pumping extraction wells or include a legend in <br /> the figures that refers to Table 5.3-4. <br /> In addition, because different extractions wells are operational during different quarters, <br /> the amount of plume capture differs significantly from quarter to quarter. However, no <br /> discussion of these discrepancies is provided in the Section 5 (Extraction System <br /> Performance). For completeness,please revise the Report to include a discussion of the <br /> differences between capture zones depicted for the 3rd quarter of 2000 and those in <br /> Appendix H for the three prior quarters. <br /> 20. Appendix H, Figure H-1 and Tables 5.3-3 and 5.34: Figure H-1 indicates that <br /> extraction wells EW040AU through EW044AU were operating. However, these wells <br /> are not listed in Table 5.3-3 and Table 5.3-4 indicates that EW040AU and EW041AU <br /> were not operating. Please resolve this discrepancy. <br /> 21. Appendix H, Figures H-1 through H-6: In EPA's comments dated June 19, 2000 <br /> regarding the 1999 Annual Monitoring Report, it was stated that future reports focus on <br /> evaluating whether groundwater at wells EW003 and EW004AU will remain within the <br /> capture zone of well EW002AU to ensure that dieldrin-contaminated groundwater will be <br /> captured by the existing extraction system. However, the Report does not address this <br /> issue. Based on Figures H-1 through H-3, groundwater at EW004AU was not captured by <br /> the existing extraction system. In addition, based on Figures H-4 through H-6, <br /> groundwater at EW003 has not always been captured by the extraction system. Please <br /> 8 <br />