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Jim Pinasco <br /> June 21, 1994 <br /> Page 7 <br /> December 1992 . In addition, the horizontal scale indicating time <br /> with months and year is not consistently labelled. In some cases <br /> the scale show every other month (e.g. , December 1992, February <br /> 1993 and April 1993) and in other cases every month is shown with <br /> the same spacing as every other month (e.g. , April 1993, May <br /> 1993 , and July 1993, August 1993) . <br /> Recommendations <br /> The monthly precipitation graphs should be corrected to show <br /> the highest precipitation in January 1993. In addition, the <br /> horizontal scales for both the precipitation and ground water <br /> elevation data should be revised to be consistent, either monthly <br /> or every other month. <br /> 9. Table 4-3, Summary of Maximum Concentrations of Compounds <br /> Detected in the October 1993 Sampling Round <br /> The maximum cadmium concentration reported in the October <br /> 1993 sampling round is 11.2 micrograms per liter (µg/L) from a <br /> sample from LM-127B. The California and Federal MCLs are 10 and <br /> 5 µg/L, respectively. However, monitoring well LM-127B is <br /> considered a background well. The Report does not discuss the <br /> high cadmium level in LM-127B, a background well. <br /> Recommendations <br /> The Report should discuss the significance of the highest <br /> reported cadmium concentration that exceeds both State and <br /> Federal MCLS reported in LM-127B, which is supposed to be a <br /> background well. <br /> 10. Extent of TCE and PCE Contamination, Section 5. 1. 1.4, page <br /> 5-2 and Figure 5-2, Trichloroethene Concentrations and <br /> Potential Source Areas in Upper Horizon Groundwater, October <br /> 1993 <br /> In the discussion of extent of TCE contamination in the <br /> Upper hydrogeologic horizon, the Report states TCE contamination <br /> at LM37A "does not appear to be connected to the TCE plume to the <br /> north, as demonstrated by the lack of TCE detection in the LM38A <br /> and L442A samples (see Figure 5-2) . " However, neither LM38A nor <br /> LM42A are shown on Figure 5-2. Based on Table 3-4, LM42A is <br /> screened in the Above Upper hydrogeologic horizon and LM38A is <br /> screened in both the Above Upper and Upper hydrogeologic <br /> MSAI <br />