(a) The building sewer shall be cast iron soil pipe, ASTM specification (A74) or equal; vitrified clay sewer pipe, ASTM specification (C13) or equal; or other suitable material approved by the City Engineer.
(b) All water pipes contacted in the laying of sewers shall be protected from injury to the satisfaction of the Superintendent of Water Construction, Repair Maintenance, Supply and Treatment, and gas pipe, electric, telephone and heat conduits and pipes, to the satisfaction of the City Engineer.
(c) Any part of the building sewer that is located within ten feet of a water-service pipe shall be constructed of cast iron soil pipe with leaded or compression joints; or vitrified sewer pipe with approved compression joints as follows:
The water-service pipe shall be placed in a separate trench from the building drain and building sewer, unless otherwise approved and provided the following conditions are met:
(1) The bottom of the water-service pipe at all points shall be at least twelve inches above the top of the sewer line at its highest point.
(2) The water-service pipe shall be placed on a solid shelf excavated at one side of the common trench.
(3) The number of joints in the service pipe shall be kept to a minimum.
(4) The materials and joints of sewer and water-service pipe shall be installed in such manner and shall possess the necessary strength and durability to prevent the escape of solids, liquids and gases therefrom, under all known adverse conditions such as corrosion, strains due to temperature changes, settlement, vibrations and superimposed loads.
(d) Cast iron pipe with leaded joints may be required by the City Engineer where the building sewer is exposed to damage by tree roots; also if installed in filled or unstable ground; except that an approved nonmetallic material may be accepted if laid on a suitable concrete bed or cradle as approved by the City Engineer.
(Ord. 182-91. Passed 11-18-91.)