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Groundwater Analytical Results The chemical analytical results of groundwater samples obtained from monitor wells at the Site on February 28, 1996, are summarized in Table 2 Chemical analytical results indicated concentrations of TPHg in MW-1 (10,000 ppb), MW-2 (340 ppb), MW-3 (2,400 ppb), and MW-4 (170 ppb) Benzene concentrations ranged from 10 ppb (MW-4) to 600 ppb (MW-1) Toluene concentrations ranged from 2,900 ppb (MW-1) to less than detectable levels (ND<0 5 ppb) (MW-4) Ethylbenzene concentrations ranged from 3 6 ppb (MW-1) to 440 ppb (MW-1) Concentrations of xylenes ranged from 0 5 ppb (MW-4) to 1,900 (MW-4) In general, chemical analytical results indicate concentrations are the highest in the vicinity of monitor wells MW-1 and MW-3 (Figure 2). Attachment II contains photocopies of the laboratory analytical reports and the chain-of-custody form Purgewater Laboratory analytical results for purged groundwater were reported non-detect for TPHg and BTEX Purgewater generated from the groundwater monitor wells is currently stored onsite in 55-gallon drums and will be disposed of on-site with approval from the San Joaquin County Public Health Services (SJCPHS). Attachment II contains photocopies of the laboratory analytical reports and chain-of-custody forms FORTHCOMING ACTIVITIES During the second quarter of 1996, SECOR will conduct additional well monitoring, purging, and sampling activities The results of these activities will be summarized in a quarterly monitoring report to be submitted to you in July 1996. A Work Plan for additional assessment activities at the Site has been approved by the SJCPHS. Fieldwork to advance and sample the proposed borings and monitor well installation will commence upon approval and receipt of necessary permits for soil boring advancement Permit applications to advance the soil borings will be submitted under separate cover to the SJCPHS This report presents our understanding of existing conditions at the subject Site The conclusions contained herein are based on the analytical results and professional Judgment which are in accordance with current standards of professional practice, no other warranty is expressed or implied SECOR assumes no liability for exploratory borings or data reported by other consultants or contractors Sincerely, p Gin, SECOR international Incorporated g BQ G Nam � Todd J Brown John E Bower, R G Staff Geologist Senior Geologist 9 OFC TJB/JEB: tb Attachments • cc. Harland Knoll, San Joaquin County Public Health Services Elizabeth Thayer, California Regional Water Quality Control Board LCKFRDgm196 SECOR N000�001 01 2 April 22 1996