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. collected from monitoring wells MW-13, MW-19, and MW-20 also <br /> exceeded the DHS MCL for drinking water <br /> Hydrocarbon concentrations detected in groundwater samples collected <br /> from monitoring well MW-19 have shown a substantial decrease since t h e <br /> previous sampling period Monitoring well MW-13 has shown an increase <br /> in hydrocarbon concentrations from the previous quarter, but has still <br /> shown a significant decrease since the start of remediation MTBE <br /> concentrations iose to an all time high in MW-20 TPH-D, TBA, and TAME <br /> also appeared for the first time in MW-20 MTBE continues to be present <br /> in trace concentrations in groundwater samples collected from <br /> monitoring wells MW-8 and MW-9, well below DHS MCLS for drinking <br /> water No other petroleum hydrocarbons were detected in groundwater <br /> Samples collected from wells screened in deeper water bearing zones <br /> 6.0 RECOMMENDATIONS <br /> ASE iecommends that additional soil and groundwater ater remediation be <br /> peiformed at the site Further activities for the site will be discussed in a <br /> iemedial action plan that will be issued by ASE within the several weeks <br /> • ASE will peifoim weekly product removal for MW-5, MW-6, and P-4 <br /> Pioduct will be Stored on-Site until proper disposal can be arranged <br /> 7 0 REPORT LIMITATIONS <br /> The results presented in this report repiesent the conditions at the trnie <br /> of the groundwater sampling, at the specific locations where t h e <br /> groundwater samples were collected, and for the specific parameters <br /> analyzed by the laboratory It does not fully characterize the site f o r <br /> contamination resulting fiom 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 r e p o r t <br /> was piepared under the direction of independent CAL EPA ceitifred <br /> laboratory The independent laboratot y is Solely responsible for t h e <br /> content,, and conclusions of the chemical analysis data <br /> Frank's One Stop Quarterly Report — lune 2001 Sampling <br /> -4- <br />