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1 <br /> rA 7, <br /> • Date 9/20/2002 <br /> Quarter 3Q02 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 595 Address 6100 N Highway 99,Stockton,CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR/Rusty Benkosky <br /> Consultant Project No 77BP 50595 02 0336 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services <br /> (SJCPHS) <br /> Assembly Bill 681 Status Property owned by Madeline Scannavmo <br /> WORK PERFORMED THIS QUARTER (Third Quarter—2002): <br /> 1 Performed groundwater monitoring and sampling (including onsite water supply well WSW,offsite water <br /> supply well DW-2, and newly installed shallow wells MW-8 though MW-10 and deep wells DMW-1 through <br /> DMW-3) <br /> 2 Prepared and submitted"Quarterly Groundwater Monitoring Report"dated July 8,2002 <br /> 3 Prepared and submitted"Monthly System Performance Summary-July 2002"dated August 5,2002 <br /> 4 Prepared and submitted"Sate Assessment Report"dated September 13,2002 <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter - 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling(including WSW and DW-2) <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Prepare and submit monthly system performance summary for August and September <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring/Offsite Remediation <br /> Frequency of Groundwater Sampling MW-1 through MW-10,DMW-1 through DMW-3,WSW, and DW-2 <br /> Sampled guarterly <br /> DW-1 influent and effluent sampled monthly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present Onsite No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques NA <br /> Approximate Depth to Groundwater 60'/a to 73Vt ft <br /> Shallow Groundwater Flow/Gradient Northwest—Northeast @ 0 001 —0 003 ft/ft <br /> Deep Groundwater Flow/Gradient Southeast @ 0 011 ft/ft <br />