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• Date June 14,2001 Quarter 2QOI ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 434 Address 501 West Kettleman Lane,Lode,CA ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky Consultant Project No 077 43125 702 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 (Second Quarter—2001): 1 Conducted groundwater monitoring and sampling 2 Prepared and submitted quarterly groundwater monitoring report WORK PROPOSED FOR NEXT QUARTER (Third Quarter—2001): 1 Conduct quarterly groundwater monitoring and sampling 2 Prepare and submit quarterly groundwater monitoring report QUARTERLY RESULTS SUMMARY Current Phase of Project Monitoring Frequency of Groundwater Sampling Wells W-1A,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 Approximate Depth to Groundwater 54 V2 to 56%feet Groundwater Gradient Southeast @ 0 03 ft/ft DISCUSSION: TPHg was reported in one of six wells sampled this quarter at a concentration of 1,280 ppb(W-2A) Benzene was reported in one of the six wells at a concentration of 0 601 ppb(W-2B) MtBE was reported in three of the six wells sampled this quarter at concentrations of 2 49 ppb(W-IA),2 01 ppb (W-2),and 26 5 ppb(W-2B) Oil and Grease was not detected in well W-9 Groundwater elevations across the site increased by an average of 0 03 feet this quarter Groundwater flow direction was to the southeast at 0 003 ft/ft consistent with historical data Groundwater chemical concentrations in site wells this quarter were consistent with previous data