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1997, 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 April 16, 1997, is presented on Figure 2 and summarized in Table 2 Gasoline and BTEX were present at detectable concentrations in each of the samples submitted for analysis Chemical analytical results indicate the highest concentrations of TPHg and benzene are in the vicinity of monitor wells MW-1, and MW-3 TPHg concentrations in groundwater samples ranged from 25,200 parts per billion (ppb) in monitor well MW-1, to less than detectable levels in samples collected from monitor wells MW-7, MW-8, MW-10 Benzene concentrations ranged from below the laboratory method detection limit (<0 5 ppb) in monitor wells MW-7 and MW-10, to 1,160 ppb in MW-1 At the request of the San Joaquin County Public Health Services,Environmental Health Division(SJC/PHS), two groundwater samples were submitted for analysis of MTBE by EPA Method 602 MTBE was reported with a concentration of 5 7 ppb in a sample collected from monitor well MW-1, and less than detectable levels (<5 ppb) in a sample collected from monitor well MW-10 Attachment II contains photocopies of the laboratory analytical reports and the chain-of-custody form Pu rgewater Purge water generated during groundwater purging was transported by Integrated Waste Management, Inc to Mckittrick Waste Treatment Site, in Mckittrick, California, for treatment and disposal FORTHCOMING ACTIVITIES During the third quarter of 1997, 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 October 1997 In addition, a soil remediation feasibility work plan will be submitted to evaluate remedial options for the site 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 DG - � Sincerely, S.a OC ,SECOR International Incorporated qV1 N a CL 0 N(L Wes CD Todd J Brown John E Bower, R G ffGeologist Senior Geologist 9�OFCAI Sta TJB/JEB tb Attachments cc Harlin Knoll, San Joaquin County Public Health Services Elizabeth Thayer, California Regional Water Quality Control Board SFCOR L(-KFRDgm 2972 J0710-001-01 July 29 Y997