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Date June 6, 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 Joa uin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 1997): <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 (Second 1997): <br /> 1. ARCO will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for June 1997. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: Quarter! <br /> Frequency of Groundwater Monitoring: Quarter! <br /> Sample Date: March 21, 1997 <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: 41.97 to 43.16 <br /> Direction of Groundwater Flow: Southeast <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 /> southeast. The groundwater gradient during previous sampling events has been predominantly toward <br /> event (November 1996). <br /> the southeast. Groundwater elevation increased approximately 8.61 feet from the previous sampling <br /> SACIN:TJ010905108051470.3AS-971cj6:1 Fmcon <br /> Rev.0.6/6/97 <br />