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• Date October 29,2001 Quarter 3Q01 ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 595 Address 6100 N Highway 99,Stockton,CA ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person SECOR/Rusty Benkosky Consultant Project No 077 43 130 703 Primary Agency/Regulatory ID No San Joaquin County Public Health Services (SJCPHS) Assembly Bill 681 Status Property owned by Madeline Scannavino WORK PERFORMED THIS QUARTER (Third Quarter - 2001): 1 Performed groundwater monitoring and sampling(including onsite water supply well,WSW) 2 Prepared and submitted quarterly groundwater monitoring report 3 Performed additional site assessment . WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter - 2001): 1 Perform quarterly groundwater monitoring and sampling(including WSW) 2 Prepare and submit quarterly groundwater monitoring report 3 Prepare and submit report documenting additional site assessment QUARTERLY RESULTS SUMMARY Current Phase of Project Monitoring Frequency of Groundwater Sampling MW-1 through MW-7 and WSW-1 sampled quarterly Frequency of Groundwater Monitoring Quarterly Is Free Product(FP)Present Onsite No FP Recovered this Quarter NA Cumulative FP Recovered to Date NA Current Remediation Techniques NA Approximate Depth to Groundwater 58Y2-63V4 ft Groundwater Flow and Gradient Northwest @ 0 002 fdit DISCUSSION: Total petroleum hydrocarbons as gasoline(TPHg) were reported in four of the seven wells sampled this quarter at concentrations ranging from 120 ppb(MW-1)to 750 ppb(MW-4) Benzene was reported in four of the seven wells . at concentrations ranging from 0 73 ppb(MW-3)to 59 ppb(MW-2) Methyl tert-butyl ether(MtBE),analyzed using EPA Method 8260A,was detected in five of the seven wells at concentrations ranging from 2 6 ppb(MW-5) to 1,400 ppb(MW-4) Di-isopropyl ether(DIPE) was reported in one of the seven wells at a concentration of 2 2 i I