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Category E - Supplies and Services : The procedure for processing transactions involving the purchase of specialized or technical services and / or materials from another UW institution vary depending on whether former WARF or Peterson Processing Center ( PPC ) institutions are involved . The first objective involved the confirmation of the applicability of the wheel load distribution criteria contained in current bridge design specifications for a particular aluminum girder concrete deck bridge ; the second objective involved the confirmation of specification models of stress range versus load cycle ( S-N ) behavior for Category E weld details on aluminum girders . The new category E IRR members will also be credentialed by the facility with their training attachment and should not be subject to push / pull . The research will establish the influence of selected design parameters on the wheel load distribution for a particular aluminum girder bridge and provide additional data to evaluate the fatigue strength of Category E weld details in full-scale , aluminum girders . In fact , they may further reduce the accuracy of reporting by increasing assignment to Category E of animals that experience mild or questionable pain or distress .