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1 <br /> . . a to • The maximum concentrations o ind* idual VOCs detected in eith r monitoring <br /> or private wells and their respective comparison values, <br /> Chemiea Maximum Concentration <br /> Comparison Values <br /> (ppb) (ppb) <br /> trichloroethene'- 1000. C EG <br /> MMCL=5 <br /> EMEG 2 <br /> tetahloroethcn 150 CREG=0.7 <br /> MMCL=5 <br /> 1,1,1-tricbloroet ane 96 MMOL=200 <br /> 1,1-dichlorothne . 13 CREG=0.06 <br /> MMCL7 <br /> EMEG 90 <br /> 1,1-dichlorocthane 8 ORSG— 0 <br /> toluene 48 EMEG 200 <br /> MMCL L000 <br /> xylenes 1.8 EMEG =2,000 <br /> MMCL= 10,000 <br /> reor' 7.5 ORS G 2 10000 <br /> -xylene 0.6 EI1 EG :=2,00 <br /> MMCL= 10,0006 <br /> benzene 0.8 C EG 1 <br /> MMCL <br /> chloromethane 1.4 LTHA <br /> chloroform 4. SG <br /> CREG = <br /> EMEG = I 00 <br /> i <br /> 1. Maximum concentration exceeds the lowest comparison value. <br /> 2. 1,1,2-tri chIor -1,2,2-tri fl uoroe than <br />' 0 RSG for trichIoro fluor ethan F E N I 1 <br /> . EMIG relevant to exposures of children lasting between of 14 days to 1 year. This EMEG is lower <br /> than the equivalent EMEG for adults. <br /> . EME G relevant to exposures o f chiIdren lasting longer than 1 year.This EMEG is lover than the <br /> equivalent EMEG for adults. <br /> . Because there are no comparison values for -x lene,the comparison values for total xylenes have been <br /> used to evaluate the o-xylene detections.Total xylenes is the surra of three isomers ofxylene: m-xylene, <br /> -xylene,and -xylene(ATSDR 1995c). Therefore,using thecomparison values for total xylenes to <br /> judge the o-c leve concentration is valid. <br /> e <br /> l E =Cancer Risk Evaluation Guide for 10 excess cancer risk(ATSDR) <br /> EMEG_Environmental Media Evaluation Guide(ATSDR) <br /> MMCL=Massachusetts Drinkina Water Standard M1 EP <br /> ORSG=Massachusetts Drinking water Guideline MIE <br /> LTHA =Lifetime Health Advisory for drinking w.at r [S EP <br />