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i� Date May 4, 2001 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 6080 Address 85 Louise Avenue, Lathrop, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Delta Environmental Consultants, Inc /Jay R Johnson <br /> Consultant Project No D000-339-2 <br /> Primary Agency/Regulatory 1D No Lori Duncan, 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-3 and submitted for <br /> laboratory analysis <br /> 2 Delta compiled and evaluated groundwater monitoring data <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 Groundwater monitoring wells MW-1 through <br /> MW-3 will be purged and samples collected and analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHG) using U S Environmental Protection Agency (USEPA) Method 8015 DHS LUFT and <br /> for benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl ether (MTBE), <br /> tertiary butyl alcohol (TBA), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether (TAME)and 1,2-Dichloroethane (1,2-DCA) using USEPA Method 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling All Monitoring Wells =Quarter) <br /> Frequency of Groundwater Monitoring Quarter! <br /> Sampling Date March 22, 2001 <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered This Quarter NIA <br /> Cumulative FP Recovered to Date N/A <br /> Approximate Depth to Groundwater _ 8 05 to 8 91 feet bgs <br /> Groundwater Flow Direction Northwest - <br /> Groundwater Gradient 0 0005 ft/ft <br /> CIARCO160801Quartcr]y1200116080Q101 doe Delta <br /> 514/01 <br />