The County Executive may establish a registration fee on a sliding scale based on the number of employees engaged in repair work with incentive for employees to participate in voluntary certification through the National Institute for Automotive Service Excellence (ASE). 1.1 The following registration fees are established for any person, firm, or corporation engaged in business to repair, maintain, or tow motor vehicles or install, repair, or maintain motor vehicle equipment. a) Business Engaged in Both Repair and Towing Average Number of Fee ASE Discount Employees Per Week Fee 1 to 5 $138.00 $111.00 6 to 10 $219.00 $175.00 11 or more $299.00 $240.00 Businesses are eligible for the ASE discount fee if 25 percent of their mechanics are certified by the National Institute for Automotive Service Excellence. The ASE discount fee is 20 percent less than the regular fee. b) Business Engaged in Towing Only Number of Tow Trucks Fee 1 to 5 $138.00 6 to 10 $219.00 11 or more $299.00 Registration fees shall be paid at the time an application for a certificate of registration is filed. Certificates of registration shall be valid for an initial period of one year from the date of issuance. Certificates are renewable upon application for a period of three years. 2.1 The provisions of this regulation are severable. If a court holds that a provision is invalid or inapplicable, the remainder of the regulation remains in effect.