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Date January 23, 2003 <br /> Quarter 4`h Quarter,2002 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2186 <br /> Address 3212 North California Street, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38465946 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services <br /> SJCEHS <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Fourth 2002): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2003): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2002): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7, and VW-1A through VW-313 <br /> sampled quarterly <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 /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 35 9 to 47 2 feet below ground surface <br /> Groundwater Gradient East-Northeast @ 0 002 fVft <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 /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> analyte <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl <br /> tert-butyl ether (MtBE), and 1,2-dichloroethane (1,2-DCA) were reported in samples collected from site monitoring <br /> wells this quarter TPHg and total xylenes were detected above method reporting limits for the first time in MW-5 <br /> this quarter, at concentrations of 81 and 18 micrograms per liter(ug/1),respectively With the exception of the TPHg <br /> K V5 BP ARCOM 186\Qun wAy\i QTR 62\2185 GWMR4QO2 doc Page 1 <br />