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1999 is presented in Table l 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 26, 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 submitted for analysis Chemical analytical results indicate the highest concentrations of TPHg and benzene are in the vicinity of monitor wells MW-I and MW-5 TPHg concentrations in groundwater samples ranged from 4,050 micrograms per liter(ug/L) in monitor well MW- 5, to less than detectable levels in samples collected from monitor weIIs MW-7 and MW-10 Benzene concentrations ranged from below the Iaboratory method detection limit in monitor wells MW-7 and MW- 10, to 395 ug/L in MW-5 MTBE concentrations in groundwater samples ranged from below the laboratory method detection limit in monitor wells MW-1 through MW-3, and MW-5 through MW-10, to 25 8 ug/L in a sample collected from monitor well MW-4 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 and will be removed to a disposal/recycling facility during July 1999 FORTHCOMING ACTIVITIES During the third quarter of 1999, SECOR will conduct additional well monitoring, purging, and sampling activities and begin the construction of a soil and groundwater remediation system at the site The results of these activities will be summarized in a quarterly monitoring report to be submitted to you in October 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 bonngs or data reported by other consultants or contractors Sincerely, p GC'0� SECOR International Incorporated ��CS. p0cc 6��0�� No 6083 • Todd J Brown E Bower, R GAF CAL�F� 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 D1Tj� oVd_4 erdQZ" 077417J7ou 2 SEL MY 28 1"9 H9