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TABLES <br /> jable a: �hcn icals detected in on-site morntoring wells and their respective drinking <br /> grater standards or guidelines (MMCLs or RSG . The mean values listed in this table <br /> are the arithmetic means of the measured contaminant concentrations in these wells. <br /> Samples where the contaminant concentration was below the method detection 11*L it were <br /> not included in this calculation. <br /> Chemical Detection Frequency lain Mean Max MMC1 <br /> (detects/samples) Conc. Conc. Conc. or <br /> (ppb) (ppb) (ppb) ORSG <br /> (ppb) <br /> trichloroethene 14/29 1.7 83.1 620 <br /> tetrachloroethane 5/29 0.6 8.4 32 <br /> 1,1,1-trichloroethane 4129 o.6 0.9 1.3 Zoo <br /> chloroform 13/29 1.11 1.5 2.5 5 <br /> 1. MMCL <br /> 2. ORSG <br />