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• Date February 8,2000 <br /> Quarter I Q00 <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 701 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services <br /> Assembly Bill 681 Status Property is owned by ARCO Products Company <br /> WORK PERFORMED THIS QUARTER (First Quarter—2000): <br /> 1 Conducted groundwater monitoring and sampling <br /> 2 Prepare and submit annual groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter—2000): <br /> 1 Prepare and submit a Site Closure Report <br /> . QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling One-time event <br /> Frequency of Groundwater Monitoring One-time event <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 /> Approximate Depth to Groundwater 54 41 to 56 16 <br /> Groundwater Gradient South @ 0 002 ft/ft <br /> DISCUSSION: <br /> TPHg and MtBE were each reported in one of six wells sampled this quarter at concentrations of 393 ppb(W-2A) <br /> and 5 58 ppb(W-9),respectively Groundwater flow direction was to the south,consistent with historical data <br /> This groundwater sampling was a one-time event in preparation for site closure <br /> i <br />