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s <br /> Date April 18, 2003 Econ <br /> Quarter 1003 <br /> i <br /> ARCO AND CHEVRON <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133/94275 Address 2908 and 2905 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 Project Nos 77BP 52133 03 0336 and 77CH 94275 04 0670 <br /> Primary Agency/Regulatory ID No Lori Duncan - San Joaquin County Environmental Health <br /> Department (SJCEHD) <br /> Assembly Bili 681 Status Properties owned by Atlantic Richfield Company and Chevron <br /> Products Company, respectively <br /> WORK PERFORMED THIS QUARTER (First Quarter— 2003): <br /> 1 Performed coordinated quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Operated and maintained air sparge (AS) system (ARCO) <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter - 2003): <br /> 1 Perform coordinated quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Operate and maintain AS system (ARCO) <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring ARCO&Chevron)/Remediation (ARCO) <br /> I <br /> Frequency of Groundwater Sampling ARCO - E-2, E-8 through E-12, PR-1, BHD-1, MW-4, and <br /> MW-5 sampled quarterly, E-3 through E-7, PR-2, BHD-2, <br /> MW-1, MW-2, and MW-3 sampled 1 a and 3`d quarters only <br /> Chevron -MW-1 through MW-9 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly(ARCO&Chevron) <br /> Is Free Product (FP) Present Onsite No (ARCO&Chevron) <br /> Cumulative FP Recovered to Date 642 lbs (ARCO) <br /> Cumulative TPHg removed by GWE 3,980 lbs (ARCO) <br /> Total groundwater extracted 32,000,000 gal (ARCO) <br /> Current Remediation Techniques Air Spargmg_(AS) (ARCO) - <br /> TPHg removed by SVE this quarter None (ARCO) <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 6 84- 12 30 ft <br /> Groundwater Flow and Gradient North @ 0 002 ft/ft <br />