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Date November 30, 2000 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 5469 Address: 130 South Wilson Way, Stockton, California <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: Delta Environmental Consultants, Inc. 1 Jay R. Johnson <br /> Consultant Project No: D000-336-1 <br /> Primary Agency/Regulatory ID No: Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 2000): <br /> 1. Groundwater samples were collected from monitoring wells MW-1 through MW-6 and submitted for <br /> laboratory analysis. <br /> 2. Delta compiled and evaluated groundwater monitoring data. <br /> 3. The elevations of monitoring wells MW-1 through MW-6 and facility configuration were surveyed <br /> under the direction of a licensed land surveyor. <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2000): <br /> 1. Delta will continue to perform routine quarterly groundwater monitoring on behalf of ARCO. The next <br /> • sampling event is tentatively scheduled for December 2000. Groundwater samples from wells MW-1 <br /> through MW-6 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG), <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX) using USEPA Method 8015/8020 DNS <br /> LUFT; for tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), <br /> ethyl tertiary butyl ether (ETRE), tertiary amyl methyl ether (TAME), and 1,2-Dichloroethane (1,2- <br /> DCA), ethylene dibromide (EDB) and ethanol using USEPA Method 8260; and for methanol using <br /> USEPA Method 8015 Modified. <br /> 2. Delta will submit a well installation report documenting the findings of a soil and groundwater <br /> investigation. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling., All Monitoring Wells_Quarterly _ <br /> Frequency of Groundwater Monitoring: Quarter) <br /> Sampling Date: _September 8,2000 _ <br /> Is Free Product (FP) Present on Site: No <br /> FP Recovered This Quarter: NIA <br /> Cumulative FP Recovered to Date: NIA <br /> Approximate Depth to Groundwater: 38.05 to 38.40 feet bcJs <br /> Groundwater Flow Direction: Southeast <br /> Groundwater Gradient: 0.002 ft/ft <br /> I <br /> i <br /> PAVII{ON1MyDocurnentslAiZC0�54691QTRLy1200415a69Q300 Delta <br /> 11/30/00 3 <br /> I <br />