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�It (11 <br /> Date March 10,2006 <br /> Quarter 1"Quarter 2006 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 760 <br /> Address 225 South Cherokee Lane, Lodi, CA <br /> ARCO Environmental Engineer Paul Su le <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466403 0A143 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property Owned by Gurpreet Dhatt and Kuldeep Dhatt <br /> WORK PERFORMED THIS QUARTER (First 2006): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Submitted site closure report <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2006): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (First 2006): <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling MW-1 through MW-5 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present Onsite No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date None <br /> Current Remediation Techniques None <br /> Approximate Depth to Groundwater 58 58 to 60 45 feet below ground surface (bgs) <br /> Groundwater Flow and Gradient Southwest @ 0 02 feet/foot 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 <br /> laboratory <br /> DISCUSSION: <br /> Gasoline range organics (GRO), benzene, toluene, ethylbenzene, total xylenes, methyl tert-butyl ether (MtBE), and <br /> 1,2-dichloroethane (1,2-DCA) were detected above laboratory reporting limits in groundwater samples collected <br /> from site monitoring wells this quarter In MW-1, GRO, total xylenes, MtBE, and 1,2-DCA concentrations <br /> decreased GRO, BTEX, MtBE, and 1,2-DCA concentrations in MW-2 increased In MW-3, GRO, total xylene, <br /> and 1,2-DCA concentrations increased Other analyte concentrations were generally consistent with the historic data <br /> r. <br /> K 1WproeessV5 BP ARM0W601Quartealy00061i QTR 061760 GWMR tQ06 do Page 1 <br />