Appendix C Northeast Plateau Table C_8 TAC Lassen Modoc Siskiyou Acetaldehyde 60 22 82 Benzene 99 11 99 "1,3-Butadiene" 24 5 64 Carbon Tetrachloride 0 0 0 Chromium (Hexavalent) < .01 < .01 < .01 para-DiChlorobenzene 2 < 1 2 Formaldehyde 134 38 159 Methylene Chloride 4 1 6 Perchloroethylene 6 2 9 Diesel PM 61 53 123