Appendix C Lake Tahoe Table C_3 TAC El Dorado Placer Acetaldehyde 39 18 Benzene 36 13 "1,3-Butadiene" 10 3 Carbon Tetrachloride < .01 0 Chromium (Hexavalent) < .01 < .01 para-DiChlorobenzene 2 < 1 Formaldehyde 76 28 Methylene Chloride 5 4 Perchloroethylene 6 3 Diesel PM 31 5