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h q I <br /> Date August 5, 1996 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> • Facility No 00760 Address 225 South Cherokee Lane, Lodi, California <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person EMCON/Jay R Johnson <br /> Consultant Project No 20805-142 005 <br /> Primary Agency/Regulatory ID No Linda Turkatte, San Joaguin County Public Health Services <br /> WORKED PERFORMED THIS QUARTER (Second- 1996) <br /> 1 EMCON performed quarterly groundwater sampling <br /> 2 EMCON compiled and evaluated groundwater monitoring data <br /> WORKED PROPOSED FOR NEXT QUARTER (Third- 1996) <br /> 1 ARCO will continue to perform quarterly groundwater monitoring The next sampling event is <br /> tentatively scheduled for August 1996 <br /> 2 EMCON will prepare a Problem Assessment Report/Remedial Action Plan evaluating the extent and <br /> mass of petroleum hydrocarbons, various alternatives and, if feasible, a closure letter <br /> Current Phase of Project Remedial Alternatives bang <br /> Evaluated <br /> Frequency of Groundwater Sampling Quarterl <br /> Frequency of Groundwater Monitoring Quarterl <br /> Sampling Date May 23, 1996 <br /> Is Free Product (FP) Present On Site Na <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 56 76 to 58 02 <br /> Groundwater Flow Direction Southeast <br /> Groundwater Gradient 0 002 <br /> DISCUSSION <br /> Results of this monitoring event indicated that levels of dissolved gasoline hydrocarbons are consistent <br /> with levels detected during previous sampling events Groundwater gradient is consistent with previous <br /> sampling events Groundwater elevation increased approximately 1 25 feet from the previous sampling <br /> event (February 1996) Historical TPHG concentrations in groundwater and groundwater elevations <br /> versus time are presented in Figures 4 through 6 Because benzene concentrations have been below <br /> . laboratory detection limits during the previous four quarters, hydrographs using benzene concentrations <br /> in groundwater and groundwater elevations versus time were not prepared MTBE was below laboratory <br /> detection limits in groundwater samples collected from all monitoring wells <br /> SACH 1ARC0W7601QTR1.Y1760 QM2-951dms I <br />