proposed rule 2 4-d bensulide dcpa desmedipham dimethoate fenamiphos phorate sethoxydim terbufos and tetrachlorvinphos proposed tolerance actions through this proposed rule epa proposes revising the tolerance expression to regulate the residues of the insecticide tetrachlorvinphos z -2-chloro-1- 2 4 5-trichlorophenyl vinyl dimethyl phosphate and its metabolites 1- 2 4 5-trichlorophenyl -ethanol free and conjugated forms 2 4 5-trichloroacetophenone and 1- 2 4 5- trichlorophenyl -ethanediol. epa proposes revising and establishing 18-month time-limited tolerances in newly proposed 40 cfr 180.252 a 1 for residues of the insecticide tetrachlorvinphos and its metabolites in on cattle fat and hog fat from 1.5 ppm to 0.2 ppm of which no more than 0.1 ppm is tetrachlorvinphos per se cattle kidney and hog kidney at 1.0 ppm of which no more than 0.05 ppm is tetrachlorvinphos per se cattle liver and hog liver at 0.5 ppm of which no more than 0.05 ppm is tetrachlorvinphos per se cattle meat and hog meat at 2.0 ppm of which no more than 2.0 ppm is tetrachlorvinphos per se cattle meat byproducts except kidney and liver and hog meat byproducts except kidney and liver at 1.0 ppm milk fat at 0.05 ppm reflecting negligible residues in whole milk of which no more than 0.05 ppm is tetrachlorvinphos per se eggs from 0.1 to 0.2 ppm of which no more than 0.05 ppm is tetrachlorvinphos per se poultry fat from 0.7 to 7.0 ppm of which no more than 7.0 ppm is tetrachlorvinphos per se poultry meat at 3.0 ppm of which no more than 3.0 ppm is tetrachlorvinphos per se poultry liver at 2.0 ppm of which no more than 0.05 ppm is tetrachlorvinphos per se and poultry meat byproducts except liver at 2.0 ppm all of which expire on 18 months from the date of final publication. the agency determined that the increased tolerances are safe i.e. there is a reasonable certainty that no harm will result from aggregate exposure to the pesticide chemical residue. because the agency is taking action to establish the time-limited tolerances in on cattle hog and poultry commodities above the agency has determined that the exception that permits the safe use of tetrachlorvinphos as an additive to beef cattle dairy cattle horse and swine feed at the rates of 0.00015 lb per 100 lb body weight per day for cattle and horses and 0.00011 lb per 100 lb body weight per day for swine is no longer necessary.