“Nonexempt employee” shall mean any employee of a private patrol enterprise, other than an exempt employee, and shall include those employees who engage in street patrol work or activity. (§ 1, Ord. 661, eff. January 12, 1972, as amended by § 2, Ord. 685, eff. September 12, 1973, and § 2, Ord. 702, eff. April 17, 1974)