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,y <br /> Date January 14,2004 <br /> Quarter 4a'Quarter,2003 <br /> BP QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11191 <br /> Address 1469 West Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466550 OL058 <br /> Primary Agency/Regulatory ID No Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (Fourth 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> . QUARTERLY RESULTS SUMMARY (Fourth 2003): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7 <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 54 27 to 56 32 feet below ground surface <br /> Direction of Groundwater Flow Southwest <br /> Groundwater Gradient 0 0009 to 0 003 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 limitations <br /> • The reported results for total petroleum hydrocarbons as gasoline (TPHg) in sample MW-1 is due to discrete <br /> peaks in the C5-C6 range(probably MtBE and total xylenes)and have been rejected accordingly <br /> • The reported results for TPHg in samples MW-3, MW-4, and MW-5 are due to a discrete peak at C5 (probably <br /> MtBE) and have been rejected accordingly <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte(s) <br /> K\Wpm m'J5 8P ARCO111 I911Quancrly�4 QTR 03\11191 QMR 4Q03 doc Page 1 <br />