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Date September 23, 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: EMCON/Jay R. Johnson <br /> Consultant Project No: 20805-147.003 <br /> Primary Agency/Regulatory ID No: Steve Sasson, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 1997): <br /> 1. EMCON collected quarterly groundwater samples for laboratory analysis from monitoring wells MW- <br /> 1 through MW-3, and vapor well VW-3. <br /> 2. EMCON compiled and evaluated groundwater monitoring data. <br /> WORK PROPOSED FOR NEXT QUARTER (Third 1997): <br /> 1. ARCO will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for September 1997. <br />• Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly_ <br /> Sample Date: __ May 22, 1 997 <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: 43.61 to 44.81 <br /> Direction of Groundwater Flow: East to 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 east to <br /> northeast. The groundwater gradient during previous sampling events has been predominantly toward <br /> the southeast. Groundwater elevation decreased approximately 1.73 feet from the previous sampling <br /> event (March 1997). <br /> SAC\N- JM80SA8051470.3BS-97',,cjb:2 <br />