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Date October 31,2002 <br /> Quarter 3 Quarter,2002 <br /> BP QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy Blvd, Tracy, CA <br /> BP Environmental Engineer Scott Hooton <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466016 00336 <br /> Primary Agency/Regulatory ID No Harlin Knoll <br /> San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 2002): <br /> 1 Groundwater samples were collected from monitoring wells AMW-1 through AMW-6, MW-1 through MW-5, <br /> and MW-7 and were subnutted for laboratory analyses MW-6 was parked over and could not be sampled <br /> MW-8 was inaccessible due to construction and was not sampled <br /> 2 URS compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2002). <br /> The next groundwater sampling event is tentatively scheduled for November 2002 Groundwater samples will <br /> be collected from monitoring wells AMW-1 through AMW-6, and MW-1 through MW-8 Groundwater <br /> samples will be analyzed for total petroleum hydrocarbons as diesel (TPHd), total petroleum hydrocarbons as <br /> gasoline (TPHg), for benzene, toluene, ethylbenzene and total xylenes (BTEX) and for methyl tert-butyl ether <br /> (MtB> )using U S Environmental Protection Agency(USEPA)Methods 8015 and 8020 <br /> QUARTERLY RESULTS SUMMARY (Third 2002): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling AMW-1 through AMW-6, MW-1 through MW-8 Quarterly _ <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date 07/30/02 <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 4 91 to 7 37 feet b s <br /> Direction of Groundwater Flow SE-E <br /> Groundwater Gradient 0 006 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 limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> analyte <br /> • • In the TPHg analysis of sample MW-2 and the TPHg/BTEX/MtBE analyses of AMW-5 and AMW-6, the <br /> reporting limits wre elevated due to matrix interference <br /> K V5 BP ARCO1111941Q—nerly\3-QrR 02111194 QMR5QO2 doc Page 1 <br />