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i}- Date February 5, 1998 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT- <br /> Facility No 00548 _ Address 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting CoXontact 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 (Fourth 1997) <br /> 1 Quarterly groundwater sampling <br /> 2 Compiled and evaluated groundwater monitoring data <br /> 3 It is EMCON's understanding that ARCO has selected a contractor to remove the underground <br /> storage tanks (USTs), and the contractor has applied for the necessary permits <br /> WORK PROPOSED FOR NEXT QUARTER (First 1998). <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for February 1998 <br /> 2 Awaiting authorization from Lincoln Properties (owner of the property located south of the ARCO <br /> Station)to install additional groundwater monitoring wells <br /> 3 It is EMCON's understanding that the USTs will be removed during this quarter, assuming all permits <br /> are granted <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling _ Quarterly <br /> Frequency of Groundwater Monitoring Quarterly _ <br /> Sampling Date November 18, 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 32 19 to 34 31 _ <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 003 <br /> SACV\PJM80MO51400 7DS-98\pzusmer 1 <br />