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6.0 RECOMMENDATIONS <br /> ASE recommends the following <br /> I 1 } The extent of contamination downgradient of the site should be <br /> I assessed using Geoprobe borings as well as possible future <br /> monitoring wells <br /> 2 Due to theresence of TPH-D in the on-site drinking water well ASE <br /> P g <br /> I recommends that an additional sample be collected from this well <br /> and analyzed for TPH-D immediately <br /> I 3 ) ASE recommends that the site remain on a quarterly groundwater <br /> sampling schedule with free-product thickness measurement and <br /> removal continuing every two weeks <br /> I4 ) No significant SVOC compounds were detected which wouldJ ustify <br /> the high cost of continuing the EPA Method 8270 analysis on a <br /> quarterly basis For this reason, ASE recommends that this analysis <br /> be discontinued for future sampling periods <br /> 5 ) An additional monitoring well should be installed to monitor the <br /> water between 55 and 70-feet bgs near monitoring well MW-5 since <br /> benzene was detected at concentrations above DTSC MCLs at this <br /> location <br /> I7.0 REPORT LIMITATIONS <br /> E The results of this report represent the conditions at the time of the <br /> groundwater sampling, at the specific locations where the groundwater <br /> samples were collected, and for the specific parameters analyzed by the <br /> I laboratory It does not fully characterize the site for contamination <br /> resulting from sources other than the former underground storage tanks <br /> and associated plumbing at the site, or for parameters not analyzed by the <br /> Ilaboratory All of the laboratory work cited in this report was prepared <br /> under the direction of independent CAL-EPA certified laboratory The <br /> independent laboratory is solely responsible for the contents and <br /> conclusions of the chemical analysis data <br /> 4 <br /> I� <br /> Frank's One Stop Quarterly Report - August 1998 Sampling <br /> C -5- <br />