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rs 1�r CAMBRIA RE ffi:3002 APR 2 9 2002 Sam Savik ENVIR0,"Vcr VT HEALTH PERAtil 1l ERVf San Joaquin County Public Health Services CES 304 East Weber Avenue,Third Floor f� Stockton, California 95202 RE First Quarter 2002 Groundwater Monitoring Report BP Oil Site No 11193 (9 3202 West Hammer Lane Stockton, California / Cambria Project No 852-1530 ' ` Dear Mr Savik On behalf of BP Oil Company, Cambria Environmental Technology, Inc has prepared this First {' 6 �{t Quarter 2002 Groundwater Monitoring Report for the above referenced site This report ,;+ D summarizes chemical data collected since 1992 including analytical results associated with samples recently collected on January 28, 2002 Water level and analytical results for this monitoring event are summarized in Figure 1 and on Table 1 in Appendix A J Weekly batch groundwater extraction from well MW-1R was taking place during the monitoring and sampling activities Based on the contoured elevations, water generally flowed toward the northeast During this monitoring event, only well VW-1 reported more than 100 micrograms per liter (µg/L) of benzene, with a concentration of 560 }ig/LMore than 10,000 [.g/L methyl tert butyl ether (MTBE) was reported in wells MW-2R and VW-1, with a maximum of 52,300 µg/L reported in well VW-1 I Benzene and MTBE concentration trends and water levels in well MW-2/MW-2R are shown in Figure 2 Analytical results below reporting limits are plotted at on half the detection limit (open Oakland CA symbol) Benzene and MTBE concentrations show a general decreasing concentration trend San Ramon CA during recent sampling events Sonoma CA Cambria Environmental Technology,Inc ii// J�65th Street Suite B Oakland CA 94608 Tel(510)420-0700 Fax(510)420-9170