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i Date February 22,2001 Quarter 4Q00 ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 434 Address 501 West Kettleman Lane,Lodi,CA ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky Consultant Project No 077 41909 704 Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services Assembly Bill 681 Status Property is owned by Atlantic Richfield Company(ARCO) WORK PERFORMED THIS QUARTER (Fourth Quarter —2000): 1 Conducted groundwater monitoring and sampling 2 Prepared and submitted quarterly groundwater monitoring report 3 Performed groundwater batch extraction on well W-9 and submitted, "Groundwater Batch Extraction Report", SECOR,February 22,2001 • WORK PROPOSED FOR NEXT QUARTER (First Quarter—2001): 1 Conduct quarterly groundwater monitoring and sampling 2 Prepare and submit quarterly groundwater monitoring report QUARTERLY RESULTS SUMMARY Current Phase of Project Momtormg/Interim remediation Frequency of Groundwater Sampling Wells W-IA,W-2B,W-2,W-3,W-9,and W-2A sampled quarterly Frequency of Groundwater Monitoring Quarterly Is Free Product(FP)Present On-Site No FP Recovered this Quarter NA Cumulative FP Recovered to Date NA Current Remediation Techniques Natural Attenuation/Batch extraction of W-9 Approximate Depth to Groundwater 56 V2 to 58 V2 feet Groundwater Gradient Southeast @ 0 002—0 005 ft/ft DISCUSSION: TPI-Ig was reported in one of six wells sampled this quarter at a concentration of 151 ppb(W-2A) Benzene and MtBE were not reported in any of the six wells sampled this quarter Oil and Grease was detected in well W-9 ata concentration of 8 00 ppm Groundwater elevations across the site increased by an average of 1 55 feet this quarter Groundwater flow direction was to the southeast at 0 002—0 005 ft/ft