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4'1 ;CI1t2 -PHA - K(I( 'K V MI II IN I AIN AKNh.NAI. 1'.1/MMh.I(t_N. lt'I I Y_ AI1Fj ly11 L;IJ„_ Ya.L~e 1 Ot ~ <br />Table SA -Alluvial/Unknown Aquifer Drinking Water Contaminants of Potential Concerae - <br />Offoost Studv Area: Comparison of Historical Detections (1985-93) with Levels Detected Daring <br />the Period Between 10/90-12/93 ~' <br />Analyte Groff/Aaalybe Maximum Average Historical Range of Average 1990- Comparison <br />List is for screening Historical Historical Frequency 1990- 1990- 1993 Value (ppb) <br />purposes. Exposure to Detection Detections (1985-93) 1993 1993 Detection & Source. <br />listed analytes does NOT (ppb) (ppb) Detections Detections Frequency EPA Cancer <br />imply adverse health (ppb) (ppb) Class <br />effects will occur. in ()s. <br />Volatr3e Halogenated <br />Oreanics (YHOs) <br />roethane 25.0 13.9 7/388 2.59 2/128 <br />(12DCLE) 1.57 <br />CREG (B2) <br />Chlorobenzeue (CLC6H5) 9.85 4.94 8/424 <br /> FZMEG- <br />^^^ <br /> ~ <br />Chloroform (CHCL3) 100.0 15.37 79/523 25.0 - 636 19/128 100 MCL <br /> 0.73 I ' 'B <br />CREG <br /> Z) <br />C <br />~ <br />r 81.8 8.92 37/520 9.72 10/128 S <br />.O <br />MG B~ <br />7 <br />(TCLEE o <br />E) <br />P ~ <br />) <br />C <br />0.954 <br />Yotattle Il~rocarbona <br />(VHCa) <br />Dibromochloropropane 0.44 0.30 11/636 ~~~ 0.2 MCL <br />(DBCP) <br />Volatile Aromatic <br />Oreaniea (VAOa) <br />Benzene (C6H6) 12.0 8.32 g/4(•] ~~~ 5.0 MCL; 1.0 <br /> CREG (A) <br /> <br /> <br />Oreauoaulfrrr <br />Compounds -Herbicide <br />Related (OSCfta) <br />hnethyl 230 L56 3/474 ~~~ <br />~- <br />sulfide (CPM child <br />Chlorophenylmethyl 10.1 5.12 4/474 ND ND 20 L-THA- <br />sulfone (CPMSO2) child <br />l <br />% 17.0 THA <br />8.58 8/474 ~~~ <br />ide (CPM O) <br />sulfox chrld <br />Orgauophosphoros <br />Compomds - <br />GB-Agent Related <br />(OPHGBs) <br />Dusopropyhnethyl 1,620.0 72.61 207/612 950.0 - 36.61 91/158 600 LTHA <br />htto://www.atsdr.cdc.eov/HAC/PI-IA/roclcv/mc n2a.html 6/2/2003 <br />