All persons connecting to the City owned service connection or laying their own private water mains thereto are required to use approved galvanized standard pipe, up to and including two inch (2") in nominal internal diameter, and cast iron water main conforming to the specifications of the Public Works Director in the case of larger sizes. All such private lines shall be laid not less than four feet (4') below the surface of the ground and an equal distance below the established grade of any street where the grade has been established. If any such private main be laid in a street or highway where no grade has been established, and such grade is established at some later date, but no City water main is by that time constructed, the Public Works Director may require the consumers using such private main at the time to relay such private main in such manner as to protect it from frost damage. (Ord. 632, 7-28-1993)