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4'1'tl]R-IrHA-R(1([KYM/IIINIAIN AIrNr.NAl. It11MMhKl:b lal Y.AUAMJ I:IJ... Y3eelOYZ <br />Table SA - Alluvisl/(Jnknown Aquifer Drinking Water Contaminants of Potential Concers - <br />Of1'oost Studv Ares: Comparison of Historical Detections (1985-931 with Levels Detected During <br />the Perrod Between 10/90-12/93 °11 <br />Analyte GroudAaalyte Maximum Average Historical Rangc of Average 1990- Compariaam <br />List is for scrcening Historical Hivtorical Frequency 1990- 1990- 1993 Value (ppb) <br />purpose. Exposlac to Detxtion Detections (1985-93) 1993 1993 Detection .t Source. <br />listed analytes does NOT (ppb) (ppb) Detectioffi Detectio>B Frequency EPA Caper <br />imply adverse health (ppb) (ppb) Class <br />effects will occltr. m ()s. <br />Volah7e Halogenated <br />Oreasia (VHOs) <br />oroothaoe ?5.0 13.9 7/388 259 21128 GR <br />G <br />(~ 1.57 E <br />(B2) <br />Chlorobeaune (CLC6H5) 9.85 4.94 &424 idD R <br /> ~ ^ I lEG- <br />~ <br /> <br />Chloroform (CFICL3) 100.0 15.37 79/523 25.0 - 6.36 19/128 O <br />MCL <br /> 0.73 ~ <br />Z <br />~; 6 CREG <br /> <br />etrachbroethy <br />hme 81.8 8.92 37/520 9.72 10/128 O <br />MG <br />2 <br />7 <br />S <br />~ <br />E 0.954 H <br />~ <br />) <br />~ <br />Vdatik ]trdr4S~~a <br />(VHCs) <br />Dibromochlompropme 0.44 0.30 11/636 ~~~ 0.2 MCL <br />1DBCP) <br />Vdatik Aromatic <br />NAD+) <br />Heancne (C6H6) 12.0 8.32 5/q(7 ND ~~ 5.0 MCL; 1.0 <br /> (92EG (A) <br /> <br />Orea~s~Nnr <br />ComQo®ds - Herkitide <br />~t£ led (OSCHs) <br />mo <br />C <br />ethyl <br />lm 230 1.56 3!474 ~ - <br />( <br />~ <br />I <br />) ~ ~ ~d ~ <br />1 10.1 5.12 4/474 ~ ~ ~ THA- <br />~~ CPM~ c61d <br />Clil ~ <br />hary ~~ n.o 858 8/a74 ~ ~ ~ Tl-ra- <br />e ~d <br />O[panopltoeohorm <br />Comooaada - <br />~lggnt Rdated <br />(OPHGBs) <br />Dusopropyhnethyl 1,620.0 72.61 20'1/612 950.0 - 36.61 91/158 600 LTHA <br />httg://www.atsdr.cdc.eov/HAGPHA/rocky/roc o2a.html <br />6!2/2003 <br />