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• quarterly interpretations <br /> Groundwater samples were collected from the monitoring wells by EMC personnel on August 14, <br /> 1996 Prior to sample collection, at least three well volumes of groundwater were removed from <br /> each well by a portable submersible pump or bailer All equipment was cleaned using a solutions <br /> of Alconox and water followed by two tap water rinses The actual groundwater samples were <br /> collected with a Teflon bailer equipped with a bottom emptying device before being transferred <br /> into the laboratory supplied 40 ml VOA vials pending analyses The Chain-of-Custody <br /> documentation is presented in Appendix B <br /> Results of analysis indicate wells only MW-3, MW-7, MW-10, and MW-1 1 had detectable levels <br /> of TPH and benzene, except for MW-7 which indicated the absence of benzene The highest <br /> concentration of benzene was found in N,W3 with 33,000 ppb A benzene iso-con map is <br /> presented on Figure 2 1 l <br /> CLOSING <br /> Based on the site investigation and monitoring program, it appeai s that the shallow water zone <br /> found beneath the site exhibits the presence of dissolved hydrocarbons The monitoring events <br /> accomplished to date suggest the flow direction of groundwater across the site is generally to the <br /> east-southeast Thrifty will continue to monitor the on-site wells on a quarterly basis If you have <br /> any questions, please contact Raymond C Friedrichsen at (310) 923-9876 ext 376 <br /> Respectfully, <br /> PETER D'AMICO <br /> Manager <br /> Environmental Affairs <br /> cc CVRWQCB, Elizabeth Thayer <br />