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1 <br /> l <br /> Date May 10, 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 (First 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 installed a new air compressor and began air bubbling of ambient air at low flow rates into <br /> selected wells <br /> CIO4 Conducted optimization, operation, and maintenance of treatment system <br /> WORK PROPOSED FOR NEXT QUARTER (Second 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 June 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 and for benzene, toluene, ethylbenzene, and total xylenes (BTEX), <br /> and methyl ternary-butyl ether (MTBE) tertiary-butyl-alcohol (TBA), di-isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether(ETBE), and tertiary amyl methyl ether (TAME) using USEPA Method 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 /> Current Phase of Project Mon itoring/Re_m_ediation _ <br /> Frequency of Groundwater Sampling All Monitoring Wells_Quarterly _ <br /> Frequency of Groundwater Monitoring Quarter) <br /> Sampling Date March 15, 2001 <br /> Is Free Product(FP)Present on Site No <br /> FP Recovered This Quarter NIA <br /> Cumulative FP Recovered to Date NIA <br /> C 1ARC0121301QTRLY1200112130 Q101 doe Delta <br /> 5110101 <br />