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. Date March 2, 1998 <br /> ARCO QUARTERLY STATUS REPORT <br /> Facddy No 02168 Address 441 Charter Way, Stockton, California <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person EMCON/Jay R Johnson <br /> Consultant Project No 20805-146 010 <br /> Primary Agency/Regulatory ID No Ron Rowe, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 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 (O&M) of the soil vapor extraction (SVE) <br /> remediation system <br /> 4 EMCON collected air samples from the SVE system on a monthly basis to evaluate system <br /> . performance <br /> WORK PROPOSED FOR NEXT QUARTER (First 1998). <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for February 1998 Groundwater samples will be collected and <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection <br /> Agency (USEPA) Method 8015, and for benzene, toluene, ethylbenzene, and total xylenes (BTEX) <br /> and methyl tert-butyl ether(MTBE) using USEPA Method 8020 <br /> 2 EMCON will continue O&M, and optimization when necessary, of the SVE remediation system <br /> 3 EMCON will collect air samples from the remediation system for laboratory analysis on a quarterly <br /> basis <br /> 4 EMCON will pulse the remediation system to evaluate effectiveness of vapor extraction system and <br /> status of soil remediation <br /> Current Phase of Project Remediation <br /> Frequency of Groundwater Sampling Quarterly <br /> Frequency of Groundwater Monitoring Quarterly _ <br /> Sample Date November 17, 1997 <br /> SAC1N\PJM805\18051461 OE5-99Vnnmer-2 <br />