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Groundwater Analytical Results The distribution of groundwater sample analytical results obtained from monitor wells at the site on February 26, 1997, is presented on Figure 2 and sununartzed to Table 2 Gasoline and BTEX were present at detectable concentrations in each of the samples subriutted for analysts Chemical analytical results indicate the highest concentrations of TPHg and benzene are in the vicinity of monitor Nrells MW-1, MW-3, and MW-9 TPHg concentrations in groundwater samples ranged from 64 parts per billion (ppb) in monitor well MW-7,to 2,740 ppb in MW-L Benzene concentrations ranged from below the laboratory method detection linut(<0 5 ppb)in monitor well MW-7,to 280 ppb in MW-1 At the request of the San Joaquin County Public Health Services, Environmental Health Division, two groundwater samples were submitted for analysis of MTBE by EPA Method 602 MTBE concentrations ranged from 7 9 ppb in a sample collected from monitor well MW-10, to less than detectable levels to a sample collected from monitor well MW-1 Attachment 11 contains photocopies of the laboratory analytical reports and the chain-of-custody form Purgewater Purge water generated during groundwater development and sampling was transported by Integrated Waste Management, Inc to Mckitti i,-k Waste Ti eatinent Site, in Mckittrtck, Calitorrua, for treatment and disposal FORTHCOMING ACTIVITIES During the second quarter of 1997,SE COR will conduct additional well monitoring, purging, and sampling activities The results of these activities will be suminarized in a quarterly monitoring report to be submitted to you in July 1997 In addition,SECOR will be assisting Time Oil Company in evaluating remedial options for the site and developing a feasibility study work plan This report presents our understanding of emsting 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 a-,pressed or implied SECOR assumes no liability for exploratory borings or data reported by other consultants or contractors GE Sincerely, `5 S.B0 0" SECOR International Incoi pot acedy 0` g cc Todd J Brown John E Bower, R G (P Q2e Staff Geologist Senior Geologist gj�OF CA��O TJB/JEB tb Attachments cc Harlan Knoll, San Joaquin County Public Health Services Elizabeth Thayer, California Regional Water Quality Control Board GCKFRDgw.197 SECOR J0710401-a1 2 May 4 1997