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measured through December 19, 1996, is presented in Table 1. Copies of field observations documenting <br /> work performed at the site is presented in Attachment I. <br /> Groundwater Analytical Results <br /> The distribution of groundwater sample analytical results obtained from monitor wells at the site on <br /> December 19, 1996, is presented on Figure 2 and summarized in Table 2. Chemical analytical results <br /> indicate the highest concentrations of TPHg and benzene are in the vicinity of monitor wells MW_1, MW_ <br /> 3, and MW-9. Results of the groundwater analyses collected from monitor wells MW-7 and MW-10, <br /> were reported below the method detection Iimits for each analyzed constituent. TPHg concentrations in <br /> groundwater samples ranged from below the laboratory method detection limit [(<50 parts per billion <br /> (ppb)] in monitor wells MW-7 and MW-I0, to 21,000 ppb in MW-1. Benzene concentrations ranged <br /> from below the laboratory method detection limit (<0.5 ppb) in monitor wells MW-7 and MW-10, to <br /> 1,500 ppb in MWA. Attachment II contains photocopies of the laboratory analytical reports and the <br /> chain-of-custody form. <br /> Purgewater <br /> Purgewater generated from the groundwater monitor wells is currently stored on-site in 55-gallon drums <br /> pending evaluation of disposal options. <br /> FORTHCOMING ACTIVITIES <br /> During the first quarter of 1997, SECOR will conduct additional well monitoring, purging, and sampling <br /> activities. The results of these activities will be summarized in a quarterly monitoring report to be <br /> submitted to you in April 1997, In addition, SECOR will conduct a soil vapor extraction pilot test to <br /> assess the feasibility of utilizing soil vapor extraction technology for site remediation. <br /> This report presents our understanding of existing conditions at the subject site. The conclusions <br /> contained herein are based on the analytical results and professional judgment which are in accordance <br /> with current standards of professional practice; no other warranty is expressed or implied. SECOR <br /> assumes no liability for exploratory borings or data reported by other consultants or c r0 <br /> d <br /> S.80 0Qi <br /> Sincerely, <br /> SECOR International Incorporated <br /> o N0.6065 � <br /> Todd J. Brown John E. Bower, R.G. OFCA1-�F�Q <br /> Staff Geologist Senior Geologist <br /> TJB/JEB: tb <br /> Attachments <br /> cc: Harlin Knoll, San Joaquin County Public Health Services <br /> Elizabeth Thayer, California Regional Water Quality Control Board <br /> LCKFRDgM496SECOR <br /> J0710-001-01 2 Febr ry29,1997 <br />