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measured through August 13, 1998, is presented in Table 1 Copies of field observations documenting work performed at the site is presented in Attachment I Groundwater Analytical Results The distribution of groundwater sample analytical results obtained from monitor wells at the site on August 13, 1998, is presented on Figure 2 and summarized in Table 2 TPHg and BTEX were present at detectable concentrations in eight of the ten samples submitted for analysts Chemical analytical results indicate the highest concentrations of TPHg and benzene are in the vicinity of monitor well MW-1 TPHg concentrations in groundwater samples ranged from 15,700 micrograms per liter (ug/L) in monitor well MW-1, to less than detectable levels in samples collected from monitor wells MW-7, MW-8, and MW-10 Benzene concentrations ranged from below the laboratory method detection limit (<0 5 ug/L) in monitor wells MW-7 and MW-10, to 380 ug/L to MW-1 MTBE was reported in one monitor well this sampling event with a concentration of 8 3 ug/L to a sample collected from monitor well MWA Attachment II contains photocopies of the laboratory analytical reports and the chain-of-custody form Purge Water Purge water generated during groundwater purging is currently contained on-site in Department of Transportation rated 55-gallon drums, pending evaluation of disposal options ]FORTHCOMING ACTW=S During the fourth quarter of 1998, 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 January 1999 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 0 Sincerely, ec�'��r�G 01 a SECOR International Incorporated U �• . o No.6065 � Todd J Brown John E Bower, R OFC Project Geologist Principal Geologist TJB/JEB tb Attachments cc Harlin Knoll, San Joaquin County Public Health Services Elizabeth Thayer, California Regional Water Quality Control Board • B Wbw OINACKFO"q.M sE(.`OR 7COOSOOi 01/L0004 2 Oc"ff 16,Ma