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. Date August 29, 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 I Jay R Johnson <br /> Consultant Project No D000-339-2 <br /> Primary Agency/Regulatory ID No Lori Duncan, San 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-3 and submitted for <br /> laboratory analysis <br /> 2 Delta compiled and evaluated groundwater monitoring data <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 Groundwater monitoring wells MW-1 <br /> through MW-3 will be purged and samples will be collected and analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHG) using U S Environmental Protection Agency (USEPA) Method <br /> 8015 DHS LUFT, and for benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary <br /> butyl ether (MTBE), tertiary butyl alcohol (TBA), df-isopropyl ether (DIPE), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME),1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane <br /> (EDB) using USEPA Method 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling All Monitonng Wells= Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date June 25, 2001 <br /> Is Free Product(FP) Present on Site No <br /> FP Recovered This Quarter NIA <br /> Cumulative FP Recovered to Date NIA <br /> Approximate Depth to Groundwater 8 57 to 9 37 feet bgs <br /> Groundwater Flow Direction East <br /> Groundwater Gradient 0 0011 tuft <br /> C 1PAC0160801Quarterly12001\6080 2Q01 doc Delta <br />