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Date March 12, 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 20805-114 006 <br /> Primary Agency/Regulatory ID No Mike Infurna, San Joaquin County Public Health Services _ <br /> WORK PERFORMED THIS QUARTER (Fourth 1996) <br /> 1 EMCON performed quarterly groundwater sampling <br /> 2 EMCON compiled and evaluated groundwater monitoring data <br /> 3 EMCON conducted routine operation and maintenance of the remediation system <br /> 4 EMCON conducted routine operation and maintenance of the air sparge system <br /> 5 EMCON collected air samples from the soil vapor extraction (SVE) system on a quarterly basis to <br /> . evaluate system performance <br /> 6 EMCON monitored the dissolved oxygen levels in groundwater to evaluate the performance of the <br /> air sparge system <br /> 7 EMCON evaluated the remediation system performance <br /> RK PROPOSED FOR NEXT QUARTER First 1997 <br /> WO ( ) <br /> 1 ARCO will continue to perform quarterly groundwater monitoring The next sampling event is <br /> tentatively scheduled for March 1997 <br /> 2 EMCON will continue air sparging while monitoring the effect of sparging of dissolved hydrocarbon <br /> concentrations in groundwater <br /> 3 EMCON will conduct routine operation and maintenance on the remediation system and will continue <br /> to monitor and optimize the performance of the remediation system In addition, EMCON will collect <br /> air samples from the remediation system for laboratory analysis on a quarterly basis <br /> SWIN\0805\08051140 6DS 97\pra i <br />