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Y (� <br /> Date September 11,2000 <br /> Quarter 2Q00 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 434 Address 501 West Kettleman Lane, Lodi,CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 077 41909 702 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services <br /> Assembly Bill 681 Status Property is owned by Atlantic Richfield Company(ARCO) <br /> WORK PERFORMED THIS QUARTER (Second Quarter—2000): <br /> 1 Conducted groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter--2000): <br /> 1 Conduct 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 Wells W-1 A, W-2B, W-2,W-3,W-9,and W-2A sampled qu4qSrl <br /> Frequency of Groundwater Monitoring uarterl <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 /> Approxunate Depth to Groundwater -10 94 to-12 94 <br /> Groundwater Gradient South(a),0 001 ft/ft <br /> DISCUSSION: <br /> TPHg was reported in one of six wells sampled this quarter at a concentration of 2,640(W-2A) Benzene was <br /> reported in one of six wells sampled this quarter at a maximum concentration of 0 610(W-1A) MtBE was not <br /> detected in any of the wells sampled this quarter Groundwater elevations across the site increased by an average of <br /> 0 86 feet this quarter Groundwater flow direction was to the south at 0 001 ft/ft,consistent with historical data <br />