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Quarterly Monitoring and Sampling Report(Q3 2001) 6 <br /> Ranch Market 23569 Santa Fe Road Riverbank California August 9 2001 <br /> MW-2 A slight increase in benzene and MtBE concentrations and a decrease in the TPHg <br /> concentration were observed in MW-3 A decrease in benzene, TPHg, and MtBE concentrations <br /> was observed in MW-4 MW-6, located upgradient of the former USTs, and MW-8, located <br /> cross gradient of the former USTs, both previously reported to contain TPHg, did not contain <br /> TPHg above Iaboratory reporting limits this quarter In MW-7, an increase in benzene and TPHg <br /> was also observed <br /> MtBE was reported in domestic well DW-4 for the first time The concentration of MtBE <br /> reported in domestic well DW-4, 1 1 ug/L, is below the Secondary Maximum Contaminant Level <br /> of 5 ug/L Re-sampling of DW-4 indicated the water sample did not contain MtBE above <br /> laboratory reporting limits <br /> Future Work <br /> Future work planned in the third and fourth quarters 2001 include the following tasks <br /> • Conduct fourth quarter monitoring and sampling event <br /> • Conduct monthly sampling of domestic well DW-1 <br /> File Ranch Market\Report\Rtverbank-01-3Q <br />