No use shall be permitted in an M-2 district unless approved as a conditional use pursuant to the last paragraph of Section 17.46.030 which is characterized by or which causes any of the effects specified in the performance standards of this title for M-P districts, in Section 17.42.020A through H except as follows:

    A.    Section 17.42.020A, F and G shall apply only to noise, vibration, odor, glare, or heat which is perceptible from any point within an R district.

    B.    Section 17.42.020E shall apply only to the emission of visible gray smoke of a shade darker than No. 2 on the Ringlemann Chart referred to therein. (Prior gen. code § 8-52.8)