A. All side sewers shall be laid on not less than two percent grade (two feet per one hundred (100) feet) nor more than two hundred (200) percent (two foot vertical; one foot horizontal) grade. Side sewers shall not be laid less than thirty (30) inches from any foundation wall of any building; and if there is no foundation wall, not less than thirty (30) inches from the outer lines of any footings, pilings, or building supports. Minimum cover shall be not less than thirty (30) inches at the curb line and not less than thirty (30) inches at the property line, and not less than eighteen (18) inches on private property. Any side sewer laid generally parallel to the curb line shall have not less than thirty (30) inches of cover, and all cover measurements shall be based on the established grade or on existing improvements.

B. If required for connection to the sewer main, the city may approve a variance to a minimum grade of one percent on four-inch and six-inch side sewers upon receiving a signed grade release form from the owner. Whenever a side sewer is laid at more than one hundred percent grade, the city shall require cast iron or plastic pipe which conforms with this chapter.