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Y,1 i <br /> C A M B R I A <br /> May 17, 2002 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re First Quarter 2002 Groundwater Monitoring Report and Closure Request <br /> Shell-branded (Independent) Service Station <br /> 420 West Kettleman Lane <br /> Lodi, California <br /> SAP Code 135445 <br /> Incident No 98995525 <br /> SJCPHS/EHD Site Code 19061 <br /> Dear Mr Knoll <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Shell Oil <br /> Products US (Shell) in accordance with quarterly reporting guidelines issued by the Central <br /> Valley Regional Water Quality Control Board (RWQCB) and San Joaquin County Public Health <br /> Services,Environmental Health Division (SJCPHS/EHD) <br /> FIRST QUARTER 2002 ACTIVITES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled all site wells <br /> monthly Normally quarterly sampling events are coordinated with the former Chevron station <br /> located at 301 West Kettleman Lane, however, this quarter the gauging data from each site were <br /> collected one day apart Blaine prepared a summary table of field gauging data and gasoline <br /> constituents Cambria prepared a site vicinity map (Figure 1), an extended site map (Figure 2), <br /> and a groundwater elevation/chemical concentration map for each month (Figures 3 through 5) <br /> Blaine's report, presenting the laboratory reports, is included as Appendix A, and tables <br /> summarizing the former Chevron well gauging and analytical data for January 2002 are included <br /> as Appendix B <br /> Oakland CA <br /> San Ramon CA Because the well gauging for the two sites occurred on different days, Cambria did not prepare a <br /> Sonoma C A groundwater contour neap A review of the Shell data only for all three months indicates that <br /> onsite groundwater flow direction beneath the Shell site remains toward the southwest <br /> Cambria <br /> Environmental <br /> Technology, Inc During the January, February, and March 2002 sampling events, no total petroleum hydrocarbons <br /> as gasoline or benzene were detected in any of the site wells except for 0 63 parts per billion <br /> *rerkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />