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r�� 11ui <br /> , <br /> Date August 31,2000 <br /> Quarter 2Q00 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Benjamin Holt Drive,Stockton,CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 077 41930 802 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> Assembly Bill 681 Status Property Owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Second Quarter—2000): <br /> 1 Conducted quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater report <br /> 3 Performed operation and maintenance on remediation system <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter—2000): <br /> 1 Conduct quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater report <br /> • 3 Perform operation and maintenance on remediation system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation and Monitoring <br /> Frequency of Groundwater Sampling E-2,E-8 through E-12,PR-1,BDH-1,MW-4,MW-5 <br /> (quarterly),E-3 through E-7,PR-2,BDH-2, <br /> MW-1,MW-2,MW-3(Is`and 3nd quarter) <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present On-Site No <br /> Cumulative FP Recovered to Date 642 pounds <br /> Cumulative TPHg removed by GWETS 3,980 pounds <br /> Total groundwater extracted 32,000,000 gallons <br /> Current Remediation Techniques SVEIAS <br /> TPHg removed by SVE this quarter _20 9 pounds <br /> Cumulative TPHg removed by SVES 4,835 pounds <br /> MtBE Removed this Quarter 2 4 pounds <br /> Cumulative MtBE Removed 2 4 pounds <br /> Approximate Depth to Groundwater 4 33 to 7 10 <br /> Groundwater Gradient Northeast at 0 002 ft/ft <br /> DISCUSSION: <br /> TPHg was detected in two of the ten wells sampled this quarter at concentrations of 89 5 ppb(131113-1) and 3370 <br /> ppb(E-10) Benzene was reported in wells BHD-1 and E-10 at concentrations of 1 33 ppb and 43 4 ppb, <br /> respectively MtBE was detected in two wells at concentrations of 429 ppb (BHD-1) and 175 ppb (E-10) <br />