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a <br /> Date September 23, 1997 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility 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 20805-140 007 <br /> Primary Agency/Regulatory ID No —Mary Mea s, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 1997) <br /> 1 Performed quarterly groundwater sampling <br /> 2 Compiled and evaluated groundwater monitoring data <br /> 3 Prepared and submitted a third access agreement to Lincoln Properties (owner of the property <br /> located south of the ARCO Station) to install additional groundwater monitoring wells <br /> • WORK PROPOSED FOR NEXT QUARTER (Third 1997) <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for August 1997 <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date May 27, 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 31 16 to 33 21 <br /> Direction of Groundwater Flow East to Southeast <br /> Groundwater Gradient 0 003 <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 /> 0 38 foot in well MW-3 and decreased approximately 0 21 foot in wells MW-1, MW-2, and MW-4 through <br /> MW-6 from the previous sampling event (March 1997) <br /> SAC\N\PJ{M1805 0805 1400 7BS-97\cib 2 <br />