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Date March 12, 1997 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 02186 Address: 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: EMCONIJay 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 (Fourth 1996): <br /> 1. EMCON collected quarterly groundwater samples from monitoring wells MW-1 through MW-3, and <br /> vapor well VW-3. <br /> 2. EMCON compiled and evaluated groundwater monitoring data. <br /> WORK PROPOSED FOR NEXT QUARTER (First 1997): <br /> 1. ARCO will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for February 1997. <br /> • Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: _ Quarterly <br /> Frequency of Groundwater Monitoring: _ Quarterly <br /> Sample Date: November 27, 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: 50.51 to 51.67 <br /> Direction of Groundwater Flow: Northeast <br /> Groundwater Gradient: 0.003 <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 5.38 feet from the previous sampling event (September <br /> 1996). <br /> i <br /> 5A(1N:V'1M805\08051470.2AB-97\prz:1 <br />