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Date October 31,2002 <br /> Quarter 3Q02 <br /> ARCO AND CHEVRON <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133/ Address 2908 Benjamin Holt Dr and <br /> 94275 2905 W Benjamin Holt Dr, Stockton,CA (Figure 1) <br /> ARCO/CHEVRON Contact Paul Supple/Robert Cochran <br /> Consulting Co/Contact Person SECOR/Rusty Benkosky <br /> Consultant Protect Nos 77BP 52133 010336 and 77CH 94275 00 0670 <br /> Primary Agency/Regulatory ID No Lori Duncan- San Joaquin County Public Health Services <br /> (SJCPHS) <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company and Chevron <br /> Environmental Management Company <br /> WORK PERFORMED THIS QUARTER (Third Quarter—2002): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Operated and maintained air sparge(AS) system <br /> i WORD PROPOSED FOR NEXT QUARTER (Fourth Quarter - 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Operate and maintain AS system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Morutoring/Remediatton <br /> Frequency of Groundwater Sampling E-2,E-8 through E-12,PR-1,BHD-1,MW-4,and MW-5 <br /> sampled quarterly,E-3 through E-7,PR-2,BHD-2,MW-1, <br /> MW-2, and MW-3 sampled I"and 3`d quarters only(ARCO) <br /> MW-1 through MW-9 sampled quarterly(Chevron) <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present Onsite No <br /> Cumulative FP Recovered to Date 642 lbs (ARCO) <br /> Cumulative TPI-Ig removed by GWE 3,980 lbs (ARCO) <br /> Total groundwater extracted 32,000,000 gal (ARCO) <br /> Current Remediation Techniques Air Spargmg(AS) <br /> TPI-Ig removed by SVE this quarter None <br /> Cumulative TPHg removed by SVE 4,897 lbs (ARCO) <br /> MtBE Removed this Quarter None (ARCO) <br /> Cumulative MtBE Removed 4 5 lbs (ARCO) <br /> Approximate Depth to Groundwater 8 80— 12 21 ft <br /> Groundwater Flow and Gradient North-northeast @ 0 002—0 003 ft/ft <br />