Whenever preliminary treatment is necessary to reduce the B.O.D. to three hundred parts per million by weight or to reduce the objectionable characteristics of constituents to within the maximum limits prescribed in Section 13.04.360, such preliminary treatment shall be at the sole expense of the owner of the premises and shall be installed when the City Engineer determines that the same is necessary to comply with the standards prescribed.

All plans, specifications and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for approval of the City Engineer; and no construction of such facilities shall be commenced until such approval is noted on the plan.

Where such facilities are installed and used they shall be maintained continuously in satisfactory and efficient operation by the owner at his own expense. (Ord. 208 § 33, 1957).