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Date September 19,2002 <br /> Quarter 4th Quarter,2002 <br /> BP QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11193 <br /> Address 3202 West Hammer Lane, Stockton, CA <br /> BP Environmental Engineer Scott Hooton <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466019 00436 <br /> Primary Agency/Regulatory ID No Margaret La ono, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 2002): <br /> 1 Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-3 through MW-5, MW-7 <br /> through MW-10,and VW-1 and were subr utted for laboratory analyses <br /> 2 URS compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (First 2003)- <br /> 1 Groundwater samples will be collected from monitoring wells MW-1R, MW-2R, MW-3 through MW-10, and <br /> VW-1 and submitted for laboratory analyses <br /> 2 Compile and evaluate groundwater monitoring data <br /> QUARTERLY RESULTS SUMMARY (Fourth 2002): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 R, MW-2R, MW-3 to MW-10, and VW-1 Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date 09/11/02 <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 13 0 to 14 7 feet b s <br /> Direction of Groundwater Flow East to Northeast <br /> Groundwater Gradient 0 0009 too 001 ft/ft <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 exceptions <br /> • Elevated reporting lirruts were due to dilutions performed by the laboratory in order to quantitate a <br /> target analytes (MTBE and TBA) <br /> • 1n the TPHG analysis of samples MW-1R, MW-2R, and MW-9 the hydrocarbon pattern present is <br /> within the gasoline quantitation range but does not resemble the pattern for gasoline <br /> • The surrogate was outside recovery limits due to matrix interference The results for TPHG to sample <br /> MW-3 should be considered estimated <br /> K V5 RP ARM]I193\Qua,4nrtyl4 QTR-020WMR Jus Page 1 <br />