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�. Date October 25 1996 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 0216 Address 441 Charter Way, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person EMCON/Jay R Johnson <br /> Consultant Project No 20805-146 007 <br /> Primary Agency/Regulatory ID No _Ron Rowe, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 1996)- <br /> 1 EMCON performed quarterly groundwater sampling <br /> 2 EMCON compiled and evaluated groundwater monitoring data <br /> 3 EMCON installed four additional vapor extraction wells (see attached additional site assessment) <br /> 4 EMCON installed aboveground piping to vapor extraction wells <br /> 5 EMCON constructed and installed a soil vapor extraction (SVE) system, which includes nine vapor <br /> extraction wells The SVE system consists of a King Buck and Associates MMC-7A catalytic oxidizer <br /> and Dwyer blower <br /> 6 EMCON obtained the authority-to-construct (ATC) permit from the San Joaquin Valley Unified Air <br /> Pollution Control District (SJVUAPCD) <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth- 1996) <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for November 1996 EMCON will collect groundwater samples that will <br /> be analyzed for total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene <br /> and total xylenes (BTEX), and methyl-tert-butylether In addition, samples collected from wells MW-2 <br /> and MW-6 will be analyzed for total oil and grease <br /> 2 EMCON will start up and conduct a source test in compliance with the ATC issued by the <br /> SJVUAPCD <br /> Current Phase of Project Remediation <br /> Frequency of Groundwater Sampling Quarter/ <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date August 22, 1996 <br /> Is Free Product (FP) Present On Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 26 48 to 30 72 <br /> Direction of Groundwater Flow Northeast <br /> Groundwater Gradient 0 002 <br /> SA0N'\PJM80W80514607CS-96,cjb k <br />