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Date May 18, 1998 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 42186 Address: 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: Pinnacle/Joel Coffman <br /> Consultant Project No: 20805-147.005 <br /> Primary Agency/Regulatory ID No: Steve Sasson, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 1998): <br /> 1. Groundwater samples were collected and submitted for laboratory analysis from monitoring wells MW-1 <br /> through MW-4 and vapor well VW-3. <br /> 2. Pinnacle compiled and evaluated the groundwater monitoring data. <br /> r WORK PROPOSED FOR NEXT QUARTER (Second 1998):, <br /> 1. Pinnacle will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for May 1998, Groundwater samples from wells MW-1 through MW-4 and vapor <br /> well VW-3 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using <br /> U.S. Environmental Protection Agency (USEPA) Method 8015 Modified; and for benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) and methyl tert-butyl ether (MTBE) using USEPA Method 8020. <br /> As discussed in the February 18, 1998, meeting between SJCPHS, ARCO, and Pinnacle, groundwater <br /> samples from wells not previously analyzed.for oxygenates will be- analyzed during the second quarter <br /> sampling event. In addition, a groundwater sample from well MW-4 will again be analyzed for the <br /> oxygenates to confirm detection of tertiary butanol and MTBE. -Therefore, wells MW-2, MW-3, and MW- <br /> 4 will be analyzed for tertiary butanol, MTBE, di=isopropyl ether, ethyl tertiary butyl ether, and tertiary <br /> amyl methyl ether, using USEPA Method 8260: <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: MW-1 through MW-4,and VW-3 Quarterly <br /> Frequency of Groundwater Monitoring: Quarter) <br /> Sample Date: February 17, 1998 <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: 43.55 to 45.30 <br /> Direction of Groundwater Flow: East to Southeast <br /> Groundwater Gradient: 0.002 <br /> SACIN:1PJ010805108051470.5AS-98\???:1 <br />