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• Date June 6, 1997 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 00548 Address 9612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person EMCON/Jay R Johnson <br /> Consultant Project No 20805-140 007 <br /> Primary Agency/Regulatory ID No Mary_Meays, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 1997) <br /> 1 Performed quarterly groundwater sampling <br /> 2 Compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Second 1997) <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for June 1997 <br /> 2 EMCON will prepare and submit a third access agreement to the property owner located south of the <br /> subject site <br /> Current Phase of Project Monrtornng/Assessment <br /> Frequency of Groundwater Sampling _ Quarterly <br /> Frequency of Groundwater Monitoring Quarterly_ <br /> Sampling Date March 19, 1997 <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 30 83 to 33 08 <br /> Direction of Groundwater Flow East to Southeast <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 /> 3 72 feet from the previous sampling event (November 1996) <br /> SALIN 1pJ010805108051400 7AS-971cJb 1 smcon <br /> Rev 0 6/6/97 <br />