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6� <br /> r <br /> Date November 2, 2001 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2130 Address 7906 EI Dorado Street, 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 D000-328-1 <br /> Primary Agency/Regulatory ID No Mike Infurna, San Joaquin_County Public Health Services <br /> WORK PERFORMED THIS QUARTER(Third 2001) <br /> 1 Groundwater samples were collected from monitoring wells MWA through MW-7 Delta's technician <br /> visited the site to install a monument over well MW-10 below asphalt grade Paving work on Hammer <br /> Lane is still in progress and well MW-10 was not sampled due to inaccessibility <br /> 2 Delta compiled and evaluated groundwater monitoring data <br /> 3 Delta continued to infect ambient air at low flow rates into selected wells <br /> 401 <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2001) <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 2001 <br /> 2 Groundwater samples from monitoring wells MW-1 through MW-7 and MW-10 will be collected and <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection <br /> Agency (USEPA) Method 8015/8020 DHS LUFT, and for benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX), and methyl tertiary-butyl ether (MTBE) tertiary-butyl-alcohol (TBA), di-isopropyl ether <br /> (DIPE), ethyl tertiary butyl ether (ETRE), and tertiary amyl methyl ether (TAME) using USEPA Method <br /> 8260 <br /> 3 Continue air bubbling of ambient air at low flow rates into select wells <br /> 4 Delta will work with Teichert Construction to re-construct the well head of MW-10 following paving <br /> work on Hammer Lane <br /> i <br /> P\ARCO\21301QTRLY120011ArLo_2130_3Q01 doc Delta <br /> 11/12/01 <br />