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Date December 29, 1997 <br /> ARCO QUARTERLY STATUS REPORT <br /> Facility No 2130 _ Address 7906 EI Dorado Street, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person EMCON/Jay R Johnson <br /> Consultant Project No 20805-114 008 <br /> Primary Agency/Regulatory ID No Mike Infurna, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 1997) <br /> 1 EMCON performed routine quarterly groundwater sampling and monitoring In addition, EMCON <br /> collected groundwater samples from vapor extraction wells VW-1, VW-7, VW-8, and VW-12 at the <br /> suggestion of the San Joaquin County Public Health Services (SJCPHS) <br /> 2 EMCON compiled and evaluated groundwater monitoring data <br /> 3 EMCON conducted routine operation and maintenance of the remediation system, including routine <br /> operation and maintenance of the air sparge system <br /> �} 4 EMCON collected air samples from the soil vapor extraction (SVE) system to evaluate system <br /> performance <br /> 5 EMCON monitored the dissolved oxygen (DO) levels In groundwater to evaluate the performance of <br /> the air sparge system <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 1997) <br /> 1 ARCO will continue to perform routine quarterly groundwater monitoring The next sampling event Is <br /> tentatively scheduled for November 1997 <br /> 2 EMCON will collect DO and other data to evaluate natural biodegradation at the site <br /> 3 EMCON will pulse the remediation system and will continue to monitor and optimize the performance <br /> of the remediation system <br /> 4 During system operation, EMCON will collect air samples from the remediation system for laboratory <br /> analysis <br /> Current Phase of Project Remediation <br /> Frequency of Groundwater Sampling Quarterly <br /> Frequency of Groundwater Monitoring _ Quarterly___ <br /> Sampling Date _August 19, 1997 <br /> •� Is Free Product (FP) Present on Site No <br /> FP Recovered This Quarter N/A <br /> SAC\N\P3Q\0805V08051140 8CS-97Tcbell 1 <br />