Except as provided in Section 7-4.05 of this chapter, water lines and sewer lines shall be located as follows:
(a) The horizontal separation between a water line and a sewer line laid approximately parallel to one another shall not be less than ten (10’) feet.
(b) When a water line and a sewer line cross, the water line shall be higher than the sewer line, and the vertical separation shall not be less than three (3') feet.
(§ 8601, T.O.O.C.)