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c� <br /> t� <br /> Date _ June 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 20805-114 008 <br /> Primary Agency/Regulatory ID No Mike Infurna San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 1997) <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 /> WORK PROPOSED FOR NEXT QUARTER (Second 1997) <br /> 1 ARCO will continue to perform quarterly groundwater monitoring The next sampling event is <br /> tentatively scheduled for June 1997 <br /> 2 In addition, the vapor extraction well heads will be modified to allow access for groundwater <br /> measurement and sampling Groundwater samples will collected from vapor extraction wells VW-1 <br /> VW-7, VW-8, and VW-12 ' <br /> 3 EMCON will continue air sparging while monitoring the effect of sparging of dissolved hydrocarbon <br /> concentrations in groundwater <br /> 4 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 <br /> 5 EMCON will collect air samples from the remediation system for laboratory analysis on a quarterly <br /> basis <br /> SAON\PJ"805\08051140 8AS 97Tprz 1 <br />