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Date July 29,2003 <br /> o Quarter 2"d Quarter,2003 <br /> • BP QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy Blvd, Tracy, CA__ <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466097 00336 <br /> Primary Agency/Regulatory ID No Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> WORK PERFORMED THIS QUARTER (Second 2003); <br /> 1 Groundwater samples were collected from monitoring wells AMW-1 through AMW-6, and MW-1 through <br /> MW-8 and were subrlvtted for laboratory analyses <br /> 2 URS compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2003): <br /> 1 Groundwater samples will be collected from monitoring wells AMW-1 through AMW-6, and MW-1 through <br /> MW-8 and submitted for laboratory analyses <br /> 2 URS will compile and evaluate groundwater monitoring data <br /> . QUARTERLY RESULTS SUMMARY (Second 2003): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling AMW-1 throuo hh AMW-6, MW-1 through MW-8 Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present on Site No _ <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 4 54 to 7 04 feet below 2round surface <br /> Direction of Groundwater Flow Northwest <br /> Groundwater Gradient 0 008 feet/foot <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, <br /> LCS/LCSD results,MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory <br /> with the following limitations <br /> • The result for benzene in sample MW-4 should be considered estimated, the primary and confirmation results <br /> exceeded 40% relative percent difference <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> analyte(s) <br /> K 1WprGm.U5 BP ARMI 1194\Quoncrly\2 QTR 03\11194 QMR 2Q03 doc Page 1 <br />