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q 7 <br />. Date March 12, 1997 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facildy No 00548 Address 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Paul Supple. <br /> Consulting Co/Contact Person EMCON/Jay R Johnson <br /> Consultant Project No 20805-140 005 <br /> Primary Agency/Regulatory ID No Mary Meas San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 1996) <br /> 1 Performed quarterly groundwater sampling <br /> 2 Compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (First 1997) <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for February 1997 <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date November 20, 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 34 57 to 36 71 <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 002 <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 increased approximately <br /> 1 02 feet from the previous sampling event (August 1996) <br />• <br /> SA[1IV\PJM80"8051400 5AH-97\prz 1 <br />