Except as otherwise provided in the case of a combining district, the yard requirements in M-1 districts shall be as follows, subject to the general provisions of Section 17.52.330:

    A.    Depth of front yard: not less than twenty (20) feet;

    B.    Depth of rear yard: not less than twenty (20) feet;

    C.    Width of each side yard: not less than ten feet provided that where the abutting lot is any R district, the width of the side yard shall be not less than thirty (30) feet. (Prior gen. code § 8-51.6)