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3. Previous well monitoring program reports for the Site have acknowledged that <br /> contaminant capture by the groundwater extraction system was incomplete due <br /> to reduced pumping or lack of pumping in some wells. Furthermore,the <br /> reports have acknowledged that regardless of the condition of the well pumps, <br /> limitations in Treatment Plant#2 would prevent the plant from accepting the <br /> full discharge from extraction wells operating at design pumping rates. This <br /> Report does not indicate the current status of operational problems nor whether <br /> any activities were performed to correct system deficiencies. Please revise the <br /> Report to discuss corrective actions conducted during the quarter, if any, in an <br /> effort to improve the operating efficiency of the extraction and treatment <br /> system. <br /> SPECIFIC COMMENTS <br /> 1. Figures 2-2 through 2-5: These figures present groundwater level contours in <br /> the four identified stratigraphic horizons. Each figure includes the estimated <br /> capture zone of the groundwater extraction system. However, no chemical <br /> concentrations are indicated on these maps, and the Report does not include <br /> any other plume maps that can be correlated to the groundwater level contour <br /> maps. One purpose of the groundwater extraction system is to capture the <br /> contaminant plume. Without graphic presentations comparing the capture <br /> zones to the current extent of the plume,the effectiveness of the extraction <br /> system in achieving this purpose cannot be evaluated. Please revise the Report <br /> to include plume maps for the four horizons, preferably with superimposed <br /> capture zones. <br /> 2. Table 3-1, page 3-2: Table 3-1 indicates that four extraction wells were not <br /> operating during the sampling event due to pump failure. No time frame is <br /> given for when these wells will be returned to operation. Please append Table <br /> 3-1 or revise the Report elsewhere to indicate the anticipated schedule for <br /> taking the corrective action that will return these extraction wells to operation. <br /> 2. Appendix B, page B-2: This page lists notes on shutdowns and maintenance <br /> for 4th Quarter 2000 Extraction Wells. However, for each month,the list <br /> indicates"Data not available." The report gives no further explanations or <br /> discussion about obtaining this data if it exists. Please revise Appendix B to <br /> explain the lack of available data on 4th Quarter 2000 Extraction Well <br /> 2 <br />