proposed rule. chloroneb cypermethrin methidathion nitrapyrin oxyfluorfen pirimiphos-methyl sulfosate tebuthiuron thiabendazole thidiazuron and tribuphos proposed tolerance actions though this rule epa proposes to change regulations concerning cypermethrin as follows epa is proposing to increase the tolerances of cypermethrin on cattle meat goat meat horse meat and sheep meat to 0.2 ppm cattle fat goat fat horse fat and sheep fat to 1.0 ppm and milk to 2.5 ppm and revise the commodity terminology to milk fat reflecting 0.10 in whole milk . epa is also proposing to increase the tolerances of cypermethrin on hog fat to 0.1 ppm and to decrease the tolerance on hog fat in to 0.1 ppm. consequently epa is proposing to decrease the tolerance on hog meat to 0.05 ppm. in addition the agency believes that there is no reasonable expectation of detecting finite residues of cypermethrin or zeta-cypermethrin residues in or on hog meat byproducts and therefore the tolerances are no longer needed on these byproducts. further the agency believes that tolerances of 0.05 ppm should be established on egg poultry fat and poultry meat in order to harmonize with codex. consequently the agency is proposing to revoke the tolerances for cypermethrin on poultry meat byproducts and establish tolerances on egg poultry fat and poultry meat at 0.05 ppm. based on available field trial data epa determined that cypermethrin tolerances for head lettuce should be decreased from 10.0 to 4.0 ppm. also since the use of zeta-cypermethrin on head lettuce is covered by the tolerance on leafy vegetables except brassica the agency has determined that the zeta-cypermethrin tolerance on head lettuce is no longer needed. therefore the agency is proposing to decrease the tolerance on lettuce head to 4.0 ppm for cypermethrin and revoke the tolerance on lettuce head for zeta-cypermethrin. based on relevant data the agency has determined that a tolerance on cotton gin byproducts should be established at 11.0 ppm for residues of cypermethrin. because the tolerance expired on 30 june 2005 epa is proposing to remove the entry for the time-limited tolerance on mustard seed from relevant federal law. because there is an existing tolerance on grass forage in this case via a grou tolerance there is no need to include sorghum forage in the revision of the commodity terminology for sorghum forage.