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• <br /> w1.3_ P11' ;2 2 Date July 2, 2001 <br /> Quarter 2Q01 <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 43 130 702 <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 (Second Quarter—2001): <br /> 1 Conducted groundwater monitoring and sampling(including onsite water supply well) <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter—2001): <br /> 1 Conduct quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Perform additional site assessment <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1,MW-2,MW-3,MW-4, and WSW-1 sampled quarterly <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 59 to 61ih feet <br /> Groundwater Gradient West @ 0 002 ft/ft <br /> DISCUSSION: <br /> TPHg was reported in all four of the monitoring wells sampled this quarter at concentrations ranging from 166 ppb <br /> (MW-3)to 2,890 ppb(MW-4) Benzene was reported in all four of the monitoring wells sampled this quarter at <br /> concentrations ranging from 0 515 ppb (MW-3) to 875 ppb(MW-4) MtBE (by EPA Method 8260A) was detected <br /> in each of the monitoring wells sampled this quarter at concentrations ranging from 3 93 ppb(MW-3) to 2,140 ppb <br /> (MW-4) 1,2-Dichloroethane(1,2-DCA)was reported in three of the four monitoring wells sampled this quarter at <br /> concentrations ranging from 34 9 ppb(MW-2) to 203 ppb(MW-4) Additionally,the onsite domestic water supply <br /> well (WSW) was sampled for TPHg, BTEX,MtBE,and oxygenates,all of which were reported below laboratory <br /> detection limits Current quarterly groundwater analytical data was consistent with historical groundwater analytical <br />