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Date September 18,2002 <br /> Quarter 3rd Quarter,2002 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11193 <br /> Address 3202 West Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer Scott Hooton <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466019 00.436 <br /> Primary Agency/Regulatory ID No Margaret Lagono, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 2002): <br /> 1 Groundwater samples were collected from monitoring wells MWAR, MW-2R, MW-3 through MW-5, MW-7 <br /> through MW-10,and VW-1 and were submitted for laboratory analyses <br /> 2 URS compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2002): <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 (Third 2002): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 R, MW-2R, and MW-3 to MW-10 Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date 07/29/02 <br /> Is Free Product (FP) Present Onsite No <br /> FP Recovered This Quarter NA <br /> Cumulative RP Recovered to Date NA <br /> Approximate Depth to Groundwater 12 47 to 14 05 feet bgs <br /> Direction of Groundwater Flow Radial Outward <br /> Groundwater Gradient 0 013 to 0 025 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 linuts were due to dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> • TPHG and BTEX concentrations should be considered estimated for samples for MW-6 because the <br /> samples were analyzed one day after the method-specific holding time of 14 days for preserved <br /> samples <br /> • Samples were analyzed for VOCs well beyond the EPA recommended holding time, the positive VOC <br /> results should be considered biased low and should be used for conformational purposes only <br /> K U5 BP ARCOV I i931Quaverlyl3 QTR_02XGWMR doe Page 1 <br />