VIOLATED 40 CFR SECTION 82.17 USED REFRIGERANT SUBSTITUTE FOUND UNACCEPTABLE BY EPA. VIOLATION OF SECTION 612 OF CAA. INSPECTED 7/17/96. SPRINT USING HC-12A AS A SUBSTITUTE FOR CFC-12 IN MVACS IN THE VEHICLE FLEET. AO ISSUED FY-96 ORDERING SPRINT TO CEASE USING HC-12A AS A REPLACEMENT.