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4 <br /> u <br /> i <br /> Date April 22,2002 <br /> Quarter 1 Q02 <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 77BP 50434 00 0701 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services(SJCEHS) <br /> Assembly Bill 681 Status Pro erty owned by Atlantic Richfield Com any <br /> WORK PERFORMED THIS QUARTER (First Quarter -2002): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter - 2002): <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 55'2 to 571/4 ft <br /> Groundwater Gradient Southeast @ 0 002 ft/ft <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg), were reported as non-detect in all six wells sampled this quarter <br /> Benzene was reported in well W-2A at a concentration of 0 75 ppb Methyl tert-butyl ether(MtBE)was reported in <br /> two of the six wells at concentrations of 0 71 ppb(W-2B) and 0 94 ppb(W-2) Total xylenes were reported in one <br /> well(W-2A)at a concentration of 0 79 ppb Oil and grease were reported as non-detect in well W-9 Chemical c <br /> concentrations were consistent with historical data Groundwater elevations across the site increased by an average <br /> of 154 ft Groundwater flow direction was to the southeast at an approximate gradient of 0 002 Wit <br /> This report presents our understanding of existing conditions at the subject site The conclusions contained herein <br />