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Date October 25, 1996 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 00548 Address 1612 Hammer Lane Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Cc /Contact Person EMCON/Jay R Johnson <br /> Consultant Protect No 20805-140 005 <br /> Primary Agency/Regulatory ID No Mary Meays,_San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third- 3996) <br /> 1 Performed quarterly groundwater sampling <br /> 2 Compiled and evaluated groundwater monitoring data <br /> 3 EMCON submitted a workplan associated with the future removal of the undergound storage tanks to <br /> the regulatory agencies <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 <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date August 29, 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 35 66 to 37 60 <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 004 <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 The groundwater flow direction and <br /> . gradient were consistent with previous sampling events Groundwater elevation decreased approximately <br /> 1 73 feet from the previous sampling event (May 1996) <br /> ')A('\1\PJ%080"8051400 5CS 9S-g1, <br />