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S E C O R <br /> . Date April 26, 2004 <br /> Quarter 1 Q04 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 4932 Address 16 E Harding Way, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECORIRusty Benkosky <br /> Consultant Project No 77BP 54932 04 0336 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services (SJCPHS) <br /> Assembly Bill 681 Status Property owned by ARCO <br /> WORK PERFORMED THIS QUARTER (First Quarter— 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Prepared and submitted monthly groundwater discharge reports <br /> 4 Operated and maintained sod vapor extraction and groundwater extraction remedial system <br /> 5 Continued with weekly batch extraction events in offsite remedial wells <br /> 6 Submitted Revised Remedial Action Plan and Work Plan for Ozone Sparge Well Installation dated <br /> February 9, 2004 <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter - 2004)• <br /> 1 Perforin quarterly groundwater monitoring and sampling <br /> 2 Operate and maintain soil vapor extraction and groundwater extraction remedial system <br /> 3 Prepare and submit quarterly groundwater monitoring report <br /> 4 Continue with weekly batch extraction events in offsite remedial wells <br /> 5 Prepare and submit monthly groundwater discharge reports <br /> 6 Submit permits for offsite remedial system and negotiate access to adjacent Taco Bell property <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring/Remediation <br /> Frequency of Groundwater Sampling MW-1 through MWA 1, EW-1 through EW-7 DMW-1 <br /> through DMW-3 and SVE-1 Sampled quarterly <br /> Frequency of Groundwater Monitoring Quarter) <br /> Is Free Product(FP) Present Onsite No <br /> Current Remediation Techniques SVEIGWE (onsite), Batch Extraction offsite <br /> TPI-Ig removed this quarter(lbs) 646 SVE , 14 4 GWE <br /> MtBE removed this quarter(lbs) 10 7 SVE , 35 6 GWE <br /> TPHg removed - cumulative (lbs) 20,212 8 SVE + GWE <br /> MtBE removed-cumulative (lbs) 1,813 8 SVE + GWE <br /> • Groundwater extracted this quarter 223,040 (GWE), 16,700 Batch Extraction <br /> Cumulative groundwater extracted 406,240 (GWE), 76,2�Batch Extraction) <br /> Approximate Depth to Groundwater 29 80—39 11 ft <br /> 11ARCUA9321QMRs1200411QMR04 doc <br />