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Date July 23, 1996 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 02186 Address: 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer: Kyle_Christie <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 T _, <br /> WORKED PERFORMED THIS QUARTER (Second- 1996): <br /> 1. EMCON developed vapor extraction well VW-3 on May 7, 1996. <br /> 2. EMCON performed quarterly groundwater sampling on monitoring wells MW-1 through MW-3, and <br /> VW-3 on May 23, 1996. <br /> 3. 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 /> Current Phase of Project: Assessment <br /> Frequency of Groundwater Sampling: Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Sampled Date: May 23, 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: 45.19 to 46.28 <br /> Direction of Groundwater Flow: East <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 4.82 feet from the previous sampling <br /> event (February 1996). <br /> SAc_-\nr:\PJCN0805ws051470.2cs-9sy-Qs:i <br />