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%L fx <br /> 02 APR 23 <br /> April 5, 2002 <br /> Michael Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Re First Quarter 2002 Groundwater Monitoring Report <br /> BP Oil Site No 11192 <br /> 1403 Country Club Boulevard <br /> Stockton, California <br /> Cambria Project No 852-1755 <br /> Dear Mr Infurna <br /> On behalf of BP Oil Company, Cambria Environmental Technology, Inc has prepared this First <br /> Quarter 2002 Groundwater Monitoring Report for the above referenced site This report <br /> summarizes chemical data collected since 1990 including analytical results associated with <br /> (� samples recently collected on January 10, 2002 A <br /> Water level and analytical results for this monitoring event are summarized in Figure 1 and on <br /> Table 1 of Appendix A Based on the contoured elevations, groundwater flowed toward the <br /> northeast During this monitoring event, no benzene was reported except for 3 73 micrograms <br /> per liter (µg/L) in well MW-7 Wells MW-3, MW-6 and MW-7 reported more than 1,000 µg/L <br /> of methyl tert butyl ether(MTBE), with a maximum concentration of 5,450 µg/L in well MW-3 <br /> Benzene and MTBE concentration trends and water levels in well MW-3 are shown in Figure 2 <br /> Analytical results below method reporting limits are plotted at one half the detection limit (open <br /> symbol) <br /> Oakland CA <br /> San Ramon CA <br /> Sonoma CA <br /> Cambna <br /> Environmental <br /> 044'65th <br /> ology,Inc <br /> Street <br /> Suite B <br /> Oakland CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />