Install a three-inch inside diameter smooth wall, non-corrosive pipe through the curb and sidewalk (see Std Plan 109). For retrofit, saw cut and remove one panel of sidewalk and 1-foot of curb only (do not remove gutter). Pipe flow line shall match gutter flow line and pipe shall be cut off flush with face of curb. Sidewalk concrete shall encase pipe in three-inch concrete jacket. Replace curb, gutter, sidewalk and pavement to match adjacent improvements (Std Plan 110).