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• Table a: Chemicals detected in private wells and their respective drinking water <br /> standards or guidelines MMCLs or RSGs . This table does not include samples of <br /> private well water that had alread y.passed through a carbon filtration unit. The mean <br /> values listed in this table are the arithmetic means of the measured contaminant <br /> concentrations in these wells. Samples where the contaminant concentration was below <br /> the method detection limit were n t included in this calculation. <br /> Chemical Detection Frequency Min Man Max MMCL <br /> (detects/samples) Conc.. Conc. Conc. or <br /> (ppb) (pleb) (pleb) ORS G <br /> (ppb) <br /> trichloroethene 121108 1.5 227.1, 620 <br /> tetraehloroethene 5/108 0.5 1.8 4.0 <br /> 1,1,1-trichloroethane 3/108 0.92 1.7 2.2 200 <br /> 1,1-dichloroethane 11108 0.6 0.6 0.6 70 <br /> chloroform 57/108 0.5 1.4 4.3 <br /> 1. MMOL <br /> 2. ORS G <br /> 3. This value was estimated. The concentration was above the calibrated range of the <br /> a <br /> instrument. <br /> Table b: The maximum concentration of each chemical that was detected in the wells at <br /> AP 62 Lot 241, AP 62 Lot 72 and AP 69 Lot 32. This table includes unfiltered samples <br /> collected from the wells at AP 62 Lot 241 and AP 62 Lot 72 after the carbon filtration <br /> units had been installed on these wells. + <br /> Chemical Max Conc. at MaxConc. at Max Conc. at MMOL <br /> AP 62 Lot 241 AP 62 Lot 72 AP 69 Lot 32 or <br /> (ppb) ( ) DRSG <br /> (ppb) <br /> trichloroethene 520 16 ISD <br /> tetrahloroethene 4.0 SID o. <br /> ],1,I-trichloroethane 2.2 0.92 SID 2 <br /> I,l-dichloroethane 0.6 ND ISD 7 ' <br /> chloroform ND 1.9 ND <br /> 1. This value was estimated. The concentration was above the calibrated range of the <br /> instrument. <br /> 2. MMCL <br /> . ORSG <br />