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}l <br /> iR <br /> Date February 5,2004 <br /> Quarter 4`h Quarter,2003 <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 38466462 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> (SJCEHD) _ <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <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 /> 3 Begin design and construction of SVE with air sparge system following County approval of CAP <br /> • QUARTERLY RESULTS SUMMARY (Fourth 2003): <br /> Current Phase of Project Monitoring/ Remedial Design pry w�91s <br /> Frequency of Groundwater Sampling MW-1 through MW-7, and VW-1A through VW-3B ,.s ,v�GYG, ?-A sad 3A <br /> sampled quarterly v <br /> Frequency of Groundwater Monitoring Quarterly Moi <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/SVE with airsparge to be installed <br /> Approximate Depth to Groundwater 44 89 to 46 84 feet below ground surface <br /> Groundwater Gradient Northeast to Southwest @ 0 009 to 0 03 fVft <br /> ANALYTICAL DATA REVIEW: o , 0l'1 <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 samples MW,-4, VW-1B, and <br /> VW-2B are due to a discrete peat at C5 (probably MtBE)and have been refected <br /> • The reported results for methyl tert-butyl ether (MtBE) in samples MW-1 and MW-4 should be considered <br /> estimated since these results exceed the calibration range of the instrument and the samples were reanalyzed <br /> outside the U S EPA recommended hold time The initial results have been summarized in this report <br /> K%Wr—ensJ5 BP ARC01021661Quanerlykl QTR 0312186 GWMR 4Q03 doe Page 1 <br />