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r' <br /> y <br /> Date August 29, 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 /Jay R Johnson <br /> Consultant Project No D000-328-1 <br /> Primary Agency/Regulatory ID No Mike lnfurna, an Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER(Second 2001) <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-7 and MW-10 and <br /> submitted for laboratory analysis <br /> 2 Delta compiled and evaluated groundwater monitoring data <br /> 3 Delta continued to inject ambient air at low flow rates into selected wells <br /> • 4 Delta retained Morrow Surveying, Inc to relocate monitoring well MW-10 The well head of monitoring <br /> well MW-10 was damaged by the construction contractor (Teichert Construction) during widening of <br /> Hammer Lane <br /> 5 Delta temporarily repaired the well head of monitoring well MW-10 and placed a stove pipe monument <br /> over the well <br /> WORK PROPOSED FOR NEXT QUARTER(Third 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 September 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 (ETBE), 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 Operation and maintenance of air bubbling system <br /> 5 Delta will work with Teichert Construction to protect and repair the well head of monitoring well <br /> MW-10 <br />; <br /> I <br /> C 1ARC0121301QTRLY12001\Arco 2130 2QOIReport doe Delta <br /> 8/29/01 <br />