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• Date October 30,2000 <br /> Quarter 3Q00 <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 703 <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 (Third Quarter—2000): <br /> 1 Conducted groundwater momtormg and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter—2000): <br /> 1 Conduct quarterly groundwater monitoring and sampling <br /> . 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Perform groundwater batch extraction on well W-9 <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitormg/Interim remediation <br /> Frequency of Groundwater Sampling Wells W-1A,W-2B,W-2,W-3,W-9,and W-2A sampled quarterI <br /> Frequency of Groundwater Monitoring Quarter/ <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/Batch extraction of W-9 <br /> Approximate Depth to Groundwater 58 0 to 60 0 ft <br /> Groundwater Gradient Northwest @ 0 002 ft/ft <br /> DISCUSSION: <br /> TPI4g was reported in two of six wells sampled this quarter at concentrations of 113 ppb(W-9)and 718 ppb(W- <br /> 2A) Benzene was reported in one of six wells sampled this quarter at a concentration of 0 549 ppb(W-2A) <br /> MtBE(by EPA 8260) was detected in one well at a concentration of 12 3 ppb(W-2) During sampling of well W-9, <br /> globules of what appeared to be oil was noted in the well,therefore well W-9 was sampled for Oil and Grease by <br /> EPA Method 3510 Oil and Grease was detected in well W-9 at a concentration of 430,000 ppb Groundwater <br /> elevations across the site decreased by an average of 4 57 feet this quarter Groundwater flow direction was to the <br /> north-northwest at 0 002 ft/ft <br />