proposed rule. chloroneb cypermethrin methidathion nitrapyrin oxyfluorfen pirimiphos-methyl sulfosate tebuthiuron thiabendazole thidiazuron and tribuphos proposed tolerance actions epa is proposing to revise the tolerance expression for plant commodities with tolerances established for the combined residues of tebuthiuron n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n n-dimethylurea and its metabolites n- 5- 2-hydroxy-1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n n-dimethylurea n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n-methylurea and n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n-hydroxymethyl-n-methylurea. further epa is proposing to revise the tolerance expression for these animal commodities with tolerances established for the combined residues of tebuthiuron n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n n-dimethylurea and its metabolites n- 5- 1 1- dimethylethyl -1 3 4-thiadiazol-2-yl -n-methylurea n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl urea 2-dimethylethyl-5-amino-1 3 4-thiadiazole and n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n-hydroxymethyl-n-methylurea. in addition epa is proposing to revise the tolerance expression for milk with a tolerance established for the combined residues of tebuthiuron n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n n-dimethylurea and its metabolites n- 5- 1 1 dimethylethyl -1 3 4-thiadiazol-2-yl -n-methylurea n- 5- 2-hydroxy-1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n-methylurea n- 5- 1 1-dimethylethyl -1 3 4-thiadiazol-2-yl urea n- 5- 1 1- dimethylethyl -1 3 4-thiadiazol-2-yl -n-hydroxymethyl-n-methylurea and n- 5- 2-hydroxy-1 1-dimethylethyl -1 3 4-thiadiazol-2-yl -n-hydroxymethyl-n-methylurea. epa is proposing to decrease tolerances on cattle fat cattle meat goat fat goat meat horse fat horse meat sheep fat and sheep meat to 1.0 ppm and increase tolerances on cattle meat byproducts goat meat byproducts horse meat byproducts and sheep meat byproducts to 5.0 ppm. also epa is proposing to increase the tolerance on milk to 0.8 ppm. 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. further epa is proposing to revise existing regulation by adding separate paragraphs b c and d and reserving those sections for tolerances with section 18 emergency exemptions regional registrations and indirect or inadvertent residues respectively.