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CAMBRIA May 7, 2001 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, California 95202 Re Groundwater Monitoring Report — First Quarter 2001 Shell-branded Service Station 3725 Tracy Boulevard Tracy, California SAP Code 136186 Incident No 98996222 Dear Mr Knoll Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equiva Services LLC in accordance with quarterly reporting guidelines issued by the Central Valley Regional Water Quality Control Board and San Joaquin County Public Health Services, Environmental Health Division (SJCPHS) • FIRST QUARTER 2001 ACTIVITIES Groundwater Monitoring: Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled all site wells and prepared a summary table of field gauging data and gasoline constituents Cambria prepared a site vicinity map (Figure 1) and a groundwater contour/chemical concentration map (Figure 2) Blaine's report, presenting the laboratory report, is included as Appendix A Groundwater Remediation Monthly groundwater extraction (GWE) using a vacuum truck began February 7, 2000 During the first quarter of 2001, groundwater was extracted from wells MW-1A and BF-1 on January 23, February 15 and March 23 A total of 12,983 gallons of groundwater were pumped from both wells during the first quarter of 2001 A summary of the volume of groundwater extracted at the site and an estimate of the amount of total Oakland, CA purgeable hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl ether San Ramon CA (MTBE) removed during these extraction events is presented in Table 1 Sonoma, CA Cambria Emnromnental Technology Inc Serkins Street P 0 Box 259 Sonoma CA 95476 Tel(707)935-4850 Fax(707)935-6649