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. Date April 27,2001 <br /> Quarter 1 Q0 l <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 43125 701 <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 (First Quarter-2001): <br /> 1 Conducted groundwater monitoring and sampling j <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter—2001): <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 Momtoring/Intenm remediation <br /> Frequency of Groundwater Sampling Wells W-1A,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 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 54'2 to 56%feet <br /> Groundwater Gradient Southeast CC 0 001 fdit <br /> DISCUSSION: <br /> TPHg was reported in two of six wells sampled this quarter at concentrations of 108 ppb(W-IA)and 718 ppb <br /> (W-2A) Benzene was reported in three of the six wells at concentrations of 0 515 ppb(W-2B),0 790 ppb(W-2), <br /> and 9 25 ppb(W-IA) MtBE was not reported in any of the six wells sampled this quarter Oil and Grease was not <br /> detected in well W-9 Groundwater elevations across the site increased by an average of 176 feet this quarter <br /> Groundwater flow direction was to the southeast at 0 001 ft/ft <br />