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• F. T <br /> Date October 25, 1996 <br /> . ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 20 186 Address: 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: EMCON/Jay R. Johnson <br /> Consultant Project No: 20805-147.002 <br /> Primary Agency/Regulatory ID No: Steve Sasson, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third- 1996): <br /> 1. EMCON collected quarterly groundwater samples from monitoring wells MW-1 through MW-3, and <br /> vapor well VW-3 on September 19, 1996. <br /> 2. EMCON compiled and evaluated groundwater monitoring data. <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth-1996): <br /> 1. ARCO will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for November 1996. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Sample Date: _ September 19, 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: 53.26 to 54.53 <br /> Direction of Groundwater Flow: East-Northeast <br /> Groundwater Gradient: 0.004 <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. The groundwater gradient was toward the <br /> northeast. The groundwater gradient during previous sampling events was toward the southeast. <br /> Groundwater elevation decreased approximately 8.20 feet from the previous sampling event (May 1996). <br /> i <br /> SACW:\PJM8051)8051470.2DS-95\gb:1 <br />