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Date August 8, 1996 <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 Mike Infurna, San Joaquin County Public Health Services <br /> WORKED PERFORMED THIS QUARTER (Second- 1996) <br /> 1 EMCON performed quarterly groundwater sampling <br /> 2 EMCON compiled and evaluated groundwater monitoring data <br /> 3 EMCON observed the backfilling and compaction of the former underground storage tank cavity and <br /> product line trench <br /> 4 EMCON prepared and submitted a workplan to install four additional vapor extraction wells <br /> WORKED PROPOSED FOR NEXT QUARTER (Third- 1996) <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for August 1996 EMCON will collect groundwater samples that will be <br /> analyzed for total petroleum hydrocarbons as gasoline, and benzene, toluene, ethylbenzene, and <br /> total xylenes, and methyl-tert-butylether In addition, samples collected from wells MW-2 and MW-6 <br /> will be analyzed for total oil and grease <br /> 2 EMCON will install four additional vapor extraction wells <br /> Current Phase of Project Remediation <br /> Frequency of Groundwater Sampling Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date May 15, 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 25 79 to 30 09 <br /> Direction of Groundwater Flow Northeast <br /> Groundwater Gradient 0 003 <br /> DISCUSSION <br /> Results of this mondoring event indicate that levels of dissolved gasoline hydrocarbons are consistent <br /> with levels detected during previous sampling events Groundwater gradient Is consistent with previous <br /> sampling events Groundwater elevation Increased approximately 1 67 feet from the previous sampling <br /> event (February 1996) <br /> WIN\PJM805a8051460 7BS-9i\p-L% 1 <br />