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vl <br /> D <br /> CAM BRIA <br /> MAR 0 4 2002 <br /> ENVI,Roj ,,,11F1+1T February 28, 2002 <br /> PEDM/riSERVICES T" <br /> Sam Savik <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Fourth Quarter 2001 Groundwater Monitoring Report <br /> BP Oil Site No 11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> Cambria Protect No 852-1530 <br /> Dear Mr Savik <br /> On behalf of BP Oil Company, Cambria Environmental Technology, Inc has prepared this <br /> Fourth Quarter 2001 Groundwater Monitoring Report for the above referenced site This report <br /> • summarizes chemical data collected since 1992 including analytical results associated with <br /> samples recently collected on November 1, 2001 <br /> Water level and analytical results for this monitoring event are summarized in Figure 1 and on <br /> Table 1 in Appendix A Based on the contoured elevations, water generally flowed toward the <br /> east During this monitoring event, benzene was not reported except for 3 26 micrograms per <br /> liter (Eig/L) in well MW-2R and 37 4 [ig/L in well VW-1 More than 10,000 µg/L methyl tert <br /> butyl ether(MTBE) was reported in wells MW-2R and VW-1, with a maximum of 237,000 µg/L <br /> reported in well VW-1 <br /> Benzene and MTBE concentration trends and water levels in well MW-2/MW-2R are shown in <br /> the graph below Analytical results below reporting limits are plotted at on half the detection <br /> limit (open symbol) Benzene concentrations show a decreasing concentration trend, which is <br /> Oakland CA consistent with natural attenuation MTBE concentrations show a stable to increasing <br /> San Ramon CA concentration trend <br /> Sonoma CA <br /> cambna <br /> Environmental <br /> Technology,Inc <br /> 05th Street <br /> Suite 0 <br /> Oakland CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />