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Date August 5, 1996 <br />• ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 00548 Address 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person EMCON/Jay R Johnson _ <br /> Consultant Project No 20805-140 005 <br /> Primary Agency/Regulatory ID No Mary Mea s, San Joaquin County Public Health Services <br /> WORKED PERFORMED THIS QUARTER (Second- 1996). <br /> 1 Performed quarterly groundwater sampling <br /> 2 Complied and evaluated groundwater monitoring data <br /> 3 EMCON prepared a workplan associated with the removal of the underground storage tanks (USTs) <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 <br /> 2 EMCON will submit the workplan associated with the removal of USTs to the regulatory agencies <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date May 10, 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 33 88 to 38 02 <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 001 <br /> DISCUSSION <br /> Results of this monitoring event indicate that concentrations of dissolved gasoline hydrocarbons are <br />. consistent with those detected during previous sampling events Groundwater gradient is consistent with <br /> previous sampling events Groundwater elevation increased approximately 2 53 feet from the previous <br /> sampling event(February 1996) <br /> SACH 1ARCM5481QTRLY108051400 5BS-95tidms I <br />