Appendix C Lake Tahoe Table C_3 TAC El Dorado Placer Acetaldehyde 41 20 Benzene 22 10 "1,3-Butadiene" 13 7 Carbon Tetrachloride < .01 0 Chromium (Hexavalent) < .01 < .01 para-DiChlorobenzene 2 < 1 Formaldehyde 72 28 Methylene Chloride 5 4 Perchloroethylene 6 2 Diesel PM 36 11