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n t <br /> cel . <br /> Date February 18, 1997 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility 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 20805-146 007 <br /> Primary Agency/Regulatory ID No Ron Rowe, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 7996): <br /> 1 EMCON performed quarterly groundwater sampling <br /> 2 EMCON compiled and evaluated groundwater monitoring data <br /> 3 EMCON completed the installation of the remediation system <br /> WORK PROPOSED FOR NEXT QUARTER (First 1997). <br /> 1 EMCON will continue to perform quarterly groundwater mondonng for ARCO The next sampling <br /> event is tentatEvely scheduled for February 1997 EMCON will collect groundwater samples that will <br /> be analyzed for total petroleum hydrocarbons as gasoline, benzene, toluene, ethylbenzene, and total <br /> xylenes, and methyl tert-butyl ether In addition, samples collected from wells MW-2 and MW-6 will <br /> i be analyzed for total oil and grease <br /> 2 EMCON will conduct a source test and start up the remediation system in compliance with the <br /> Authonty-to-Construct permit issued by the San Joaquin Valley Unified Air Pollution Control District <br /> Current Phase of Project Remediation <br /> Frequency of Groundwater Sampling Cuarterl <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date November 25 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 61 30 78 <br /> Direction of Groundwater Flow Northeast to Sc:atheast <br /> Groundwater Gradient 0 002 <br /> DISCUSSION• <br />• Results of this monitoring event indicate that levels of dissolved gasoline hydrocarbons are consistent <br /> with levels detected during previous sampling events The groundwater flow direction and gradient are <br /> consistent with previous sampling events Groundwater elevation decreased approximately 018 feet <br /> from the previous sampling event (August 1996) <br /> SACW�PJMEIO+ 8051460 7DS-96\11b 2 <br />