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onsite drinking well All of these wells are screened in the middle o r <br /> deeper water bearing zones <br /> The benzene concentration detected in groundwater samples collected <br /> from monitoring well MW-13 exceeded the California Department of <br /> Health Services (DHS) maximum contaminant level (MCL) for drinking <br /> water The toluene concentration detected in groundwater samples <br /> collected from monitoring well MW-6 exceeded the DHS MCL for drinking <br /> water The ethyl benzene and total xylenes concentrations detected in <br /> groundwater samples collected from monitoring wells MW-6 and MW-13 <br /> exceeded the DHS MCLs for drinking water The MTBE concentrations <br /> detected in groundwater samples collected from monitoring wells MW-13, <br /> MW-14, MW-19, and MW-20 also exceeded the DHS MCL for drinking <br /> water <br /> Hydrocarbon concentrations detected in groundwater samples collected <br /> from monitoring wells MW-4, MW-14, MW-16 and MW-19 decreased <br /> significantly from the previous sampling The hydrocarbon <br /> concentrations detected in groundwater samples collected from <br /> monitoring well MW-6 show a decreasing trend but still remain elevated <br /> • The benzene, ethyl benzene, and MTBE concentrations detected in <br /> groundwater samples collected from monitoring well MW-13 increased <br /> from the previous sampling <br /> Overall there was a decrease in MTBE concentrations throughout the site <br /> with the exception of monitoring well MW-13 <br /> 6.0 RECOMMENDATIONS <br /> ASE is currently performing an additional soil and groundwater <br /> investigation downgradient of the site ASE will submit recommendations <br /> in the report to be prepared for this ongoing investigation <br /> 7.0 REPORT LIMITATIONS <br /> The results presented in this report represent the conditions at the time <br /> of the groundwater sampling, at the specific locations where the <br /> groundwater samples were collected, and for the specific parameters <br /> analyzed by the laboratory It does not fully characterize the site for <br /> contamination resulting from sources other than the former underground <br /> • storage tanks and associated plumbing at the site, or for parameters n o t <br /> analyzed by the laboratory All of the laboratory work cited in this report <br /> was prepared under the direction of independent CALrEPA certified <br /> Frank's One Stop Quarterly Report — December 2000 Sampling <br /> -4- <br />