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f <br /> 1 Date December 6,2005 <br /> Quarter 4h Quarter,2005 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11191 <br /> Address 1469 East Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466550 OA143 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> Assembly Bili 681 Status Pro2erty owned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (Fourth 2005): <br /> 1 Perforated quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2006): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2005): <br /> . Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7, Quarter) <br /> Frequency of Groundwater Monitoring Quarter) <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 52 96 to 54 80 feet below ground surface b s <br /> Direction of Groundwater Flow Southeast <br /> Groundwater Gradient 0 002 feet/toot ftlft <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 GRO in samples MWA and MW-2 is due to a discrete peak in the quantitation range <br /> (probably MtBE) <br /> • The reported results for ethanol in samples MW-2, MW-3, MW-4., MW-5, MW-6, and MW-7 should be <br /> considered estimated because the associated continuing calibration standard was outside of acceptance criteria <br /> DISCUSSION: <br /> Gasoline range organics (GRO), methyl ter[-butyl ether (MtBE) and tert-butyl alcohol (TBA) were detected above <br /> laboratory reporting limits in groundwater samples collected from site monitoring wells this quarter MtBE <br /> K%Wp�ess'B BP ARCOU 11911Qunner1y12005V4 QM 0511 E 191 GWMR 4Q05 dm Page 1 <br />