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. Date November 30, 2000 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02168 Address 441 Charter Way, Stockton, California <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person Delta Environmental Consultants, Inc 1 Jay R Johnson <br /> Consultant Project No D000-329-1 <br /> Primary Agency/Regulatory ID No Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER(Third 2000) <br /> 1 Performed quarterly groundwater monitoring and sampling for third quarter 2000 Groundwater <br /> samples were collected from monitoring wells MW-1 through MW-8, MW-1 B, MW-1 C, MW-813 and <br /> MW-8C and submitted for laboratory analysis <br /> 2 Delta directed the drilling and installation of two on-site monitoring well clusters to provide vertical <br /> assessment of petroleum hydrocarbons in soil and groundwater Wells were developed and sampled <br /> following the soil and groundwater investigation The new monitoring wells have been included in the <br /> third quarter groundwater monitoring event <br /> I• 3 Delta compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2000) <br /> 1 The next sampling event is tentatively scheduled for November 2000 Groundwater samples will be <br /> collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S <br /> Environmental Protection Agency (USEPA) Method 8015, for benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX) using USEPA Method 8020, and for five oxygenates tertiary butyl alcohol (TBA), <br /> methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETRE), and <br /> tertiary amyl methyl ether (TAME), as well as 1,2-Dichloroethane (1,2-DCA) using USEPA Method <br /> 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-8, MW-1 B, MW-1 C, <br /> MW-8B and MW-8C= Quarte__ <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date August 30, 2000 <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 18 79 to 28 83 feet bgs <br /> . Direction of Groundwater Flow East-Northeast <br /> Groundwater Gradient 0 014 fuft <br /> PAVILION1MyDocumentslARC0121681QTRLY1200012168Q300 Delta <br /> 1l/30/00 <br />