On all sidewalks built in the city there shall be a minimum slope of one-fourth inch to the foot (1/4":1') and all concrete for sidewalk or curb and gutter shall be a minimum of six (6) bag mix. All curbs constructed shall be of the rounded or rolled type curb with gutters. Construction specifications including the location of expansion and contraction joints shall be as provided in section 02528 and 02529 of the "Montana Public Works Standard Specification", third edition. All sidewalks in commercial and industrial areas shall be ten feet (10') wide. All other sidewalks constructed on any of the streets and avenues in the city shall be five feet (5') in width. No deviation from the sizes expressed herein shall be permitted unless authorization is obtained, in writing, from the council. (Ord. 416, 1-3-1994)