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\ 7. The times-series plots presented in Appendix C are difficult to review quickly due to the use of different vertical (concentration) scales on the plots. The TCE data, for example, is plotted 108 times using 43 different vertical scales. The vertical scales used range from zero to 0.1 to zero to 600 ug/1. None of the different scales is used more than seven times. In all future monitoring reports, please plot as many of the time series graphs as possible using the same vertical scale. Each of the plots should still be readable to the point where trends in the data can be seen. For TCE, this will likely require plotting data on scales of 0 to 1, 0 to 10, 0 to 100, and 0 to 1,000 ug/l. All of the plots that have the same vertical scale should be grouped together. SPECIFIC COMENTS 1. Section 1.1.4, Page 1-1 and Section 6.5.1, Page 6-4: The Report (Page 1- 1) states that no wells were abandoned during this period at DDJC-Tracy. However, on Page 6-4, the Report discusses abandonment of one monitoring well and one extraction well in June 1999. For consistency, please revise the Report to resolve this discrepancy. 2. Table 2.5-1: Table 2.5-1 (Page 2-10) shows that injection wells IW001 through IWO04B are scheduled to be abandoned in 12/99. However, it is unclear why the injection wells were scheduled to be abandoned. For clarity, please revise the table to indicate why the injection wells were scheduled to be abandoned (i.e. , why were they permanently taken out of service in 1997?) . 3. Section 3.2.2, Page 3-1: The Report states that "Table 3.2-2 provides an evaluation of selected wells with statistically significant concentration trends. . ." However, the Report does not indicate how the wells shown in Table 3.2-2 were selected and where the results for the remaining wells are presented. For clarity, please revise the Report to indicate how the wells for presentation in Table 3.2-2 were selected and include a reference to where the results of the remaining wells are presented. 4 . Section 5.2.4, Page 5-1 and Figure 5.3-7: The Report states that "EW035AU, EW036AU, and EW037AU were installed to provide groundwater to treatment plant #1 but are not in operation." However, TCE concentration data are presented for EW037AU for 2Q99 and 3Q99 on Figure 5.3-7. For consistency, please revise the Report to clarify this discrepancy. 5. Section 5.3.1.1, Page 5-2 and Figure 5.3-7: The Report states that "Both groundwater treatment systems were in operation throughout the fourth quarter of 1998 and the first three quarters of 1999". However, the data presented on Figure 5.3-7 indicates that none of the wells that are part 3