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K. <br /> Date November 27,2001 <br /> Quarter 3Q01 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 434 Address 501 W Kettleman Ln,Lodi,CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR/Rusty Benkosky <br /> Consultant Project No 077 43125 703 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services(SJCEHS) <br /> Assembly Bill 681 Status Property owned by ARCO <br /> WORK PERFORMED THIS QUARTER (Third Quarter- 2001): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter - 2001): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> • 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling W-IA,W-2B,W-2,W-3,W-9,and W-2A sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present Onsite 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 60-613/4 ft <br /> Groundwater Gradient Northwest Q 0 0002 ft/ft <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg)were reported in one of the six wells sampled this quarter at a <br /> concentration of 1,100 ppb(W-2A) Benzene and methyl tert-butyl ether(MtBE)were reported as nondetectable in <br /> all sixwells Oil and grease was reported as nondetectable in W-9 Chemical concentrations are generally <br /> consistent with historical data Groundwater elevations across the site decreased by an average of 5 39 ft <br /> Groundwater flow direction was to the northwest at an approximate gradient of 0 0002 ft/ft,which is nearly flat <br /> • <br />