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not have been adequately remediated Specifically, PHS/EHD was <br /> concerned that residual concentrations of hydrocarbon-containing soil <br /> could remain in areas underlying the former excavations and the <br />' existing buildings at both former tank sites During a meeting between <br /> PHS/EHD and Catellus representatives on April 13, 1994, Catellus <br /> agreed to conduct additional soil sampling within the former <br /> excavation footprints and underneath the existing buildings The <br /> purpose of these activities was to verify that residual hydrocarbon <br /> concentrations, if present in site sods, would not pose a significant risk <br /> to human health and the environment ERM summarized the scope <br /> of additional soil sampling in a letter workplan dated May 24, 1994, and <br /> ' approved by PHS/EHD in June 1994 <br /> This report presents the results of the recent quarterly ground water <br /> monitoring and the additional soil sampling performed according to <br /> the May 1994 workplan Following this introductory section, this <br /> document is divided into the following seven sections <br /> • A description of the general setting and history of the two former <br /> tank sites, including a general discussion of site geologic and <br /> ' hydrogeologic conditions (Section 2), <br /> • A summary of previous investigations and remedial activities <br /> performed at Former Tank Sites #1 and #2 (Section 3), <br /> • A description of the field activities performed pursuant to the May <br /> 1994 workplan and a summary of investigation results, including <br /> ground water quality monitoring results (Section 4), <br /> • An interpretation of investigation results (Section 5), <br /> • An evaluation of remedial alternatives applicable to site conditions <br /> ' at Former Tank Saes #1 and #2 (Section 6), and <br /> • Conclusions and recommendations for future action (Section 7) <br /> 1 <br /> 1-2 <br />