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Date November 6, 1998 <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: 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 (Second 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 /> WORK PROPOSED FOR NEXT QUARTER (Third 1998): <br /> 1. Pinnacle will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for August 1998. Groundwater samples from wells MW-1 through MW-4 and <br /> vapor well VW-3 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) <br /> using U.S. Environmental Protection Agency (USEPA) Method 8015 Modified; and for benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) and methyl tert-butyl ether (MTBE) using USEPA <br /> Method 8020. As discussed in the February 18, 1998, meeting between SJCPHS, ARCO, and <br /> Pinnacle, groundwater samples from wells not previously analyzed for oxygenates were analyzed <br /> during the second quarter sampling event. A groundwater sample from well MW-4 was again analyzed <br /> for the oxygenates to confirm detection of tertiary butanol and MTBE. Wells MW-1 through MW-4, and <br /> VW-3 were non-detect for tertiary butanol, di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE), <br /> and tertiary amyl methyl ether (TAME), using USEPA Method 8260. Therefore, Pinnacle proposes to <br /> analyze samples from all wells at this site for MTBE using USEPA Method 8020 only. <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: Quarterly <br /> Sample Date: June 24, 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: 35.06 to 36.69 <br /> Direction of Groundwater Flow: East <br /> Groundwater Gradient: 0.002 AA� <br /> CP1D:1LsG12NDOTR-1\2186OM2.DOC-981???:1 �LK�LQCGe <br /> Rev. 1116198 <br />