A. Whenever deemed necessary by the District Engineer to meet the requirements of Section 7.04.310, a contractor shall, at his own expense, provide such preliminary treatment in accordance with County design criteria or take such other measures as shall be required by the District Engineer to change the characteristics, contents or rate of discharge of waters or wastes to be deposited in the public sewers of the District. Facilities for preliminary treatment, including facilities required hereunder, shall be subject to the approval of the District Engineer and shall be maintained and operated in a satisfactory and effective manner at the sole expense of the connector.

B. A connector may be exempt from additional preliminary treatment requirements if he can verify to the satisfaction of the District Engineer through certified laboratory tests and valid documentation that the amount of prohibited waste discharged will be less than that allowed by the District ordinance. (Ord. 72 §1, 1991; Ord. 64 §2; Ord. 37 §2, 1983; Ord. 3 §5.6, 1973)