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Date April 26,2001 <br /> Quarter 1Q01 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 595 Address 6100 North Highway 99,Stockton,CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 077 43130 701 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services <br /> Assembly Bill 681 Status Property is owned by Madeline Scannavino <br /> WORK PERFORMED THIS QUARTER (First Quarter—2001): <br /> 1 Conducted groundwater monitoring and sampling(including onsite water supply well) <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Performed door-to-door sensitive receptor survey <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter—2001.): <br /> 1 Conduct quarterly groundwater momtonng and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Perform additional site assessment as proposed in SECOR's Work Plan forAdditional Site Assessment dated <br /> November 30,2000 <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitonng <br /> Frequency of Groundwater Sampling Wells MW-1,MW-2,MW-3,MW-4,and WSW-1 sampled <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 58 ih to 61 feet <br /> Groundwater Gradient West—Northwest @ 0 0004 ft/ft <br /> DISCUSSION: <br /> TPHg was reported in all four of the monitoring wells sampled this quarter at concentrations ranging from 178 ppb <br /> (MW-3)to 5,250 ppb(MW-4) Benzene was reported in three of the four monitoring wells sampled this quarter at <br /> concentrations ranging from 28 7 ppb(MW-2)to 738 ppb(MW-4) MtBE (by EPA Method 8260) was detected in <br /> each of the monitoring wells sampled this quarter at concentrations ranging from 7 35 ppb(MW-3)to 1,760 ppb <br /> (MW-4) Tert-butyl alcohol (TBA),Di-isopropyl ether(DIPE),and Tert-amyl methyl ether(TAME) were reported <br />