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27, 1999 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 analytics)results obtained from monitor wells at the site on January 27, 1999, is presented on Figure 2 and summarized in Table 2 TPHg and BTEX were present at detectable concentrations in eight of the ten samples subrrutted for analysis Chemical analytical results indicate the highest concentrations of TPHg and benzene are in the vicinity of monitor well MW-I TPHg concentrations in groundwater samples ranged from 2,060 micrograms per liter(ug/L) in monitor well MW- 5, to less than detectable levels in samples collected from monitor wells MW-1, MW-7, MW-8, and MW- 10 Benzene concentrations ranged from below the laboratory method detection limit in monitor wells MW-1, MW-7 and MW-10, to 139 ug/L m MW-5 MTBE concentrations in groundwater samples ranged from below the Iaboratory method detection limit in monitor wells MW-1, MW-3, and MW-5 through MW- 10, to 9 2 and 9 9 ug/L in samples collected from monitor wells MW-2 and MW-4 respectively Attachment II contains photocopies of the laboratory analytical reports and the chain-of-custody form Purge Water Purge water generated during groundwater purging was transported by Integrated Waste Management, Inc to Seaport Environmental, in Redwood City, Califorrua, for treatment and disposal FORTHCOMING ACTIVITIES During the second quarter of 1999, SECOR will conduct additional well monitoring, purging, and sampling activities The results of these activities will be summanzed m a quarterly monitoring report to be submitted to you in July 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 Sincerely, ��aED Cp�� SECOR International Incorporated �aE.co o rte Eae7i Todd J Brown John E Bower, R G �1 OF CAL��o 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 D M.0W 0CVF0RDf1-199 7 9 1" 7Cft5A01-0213 APS 2 27]999