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street, the contractor shall excavate and expose the upper end ofthe service pipe. The elevation of the pipe leaving the structure shall be determined, and the difference between the two (2) pipes shall be sufficient so that a minimum grade of one-eighth inch (1/8") per foot is maintained. (1990 Code) D. Aligmnent: No comlecting sewer shall contain bends or a combination of bends which at any point shall be greater than forty five degrees (450), mld no more than two (2) bends, regardless of angle, shall be permitted in any single house connection except where manholes or, in case of slab home, cleanouts are constructed at such points and in manner as directed by the Public Works Director. No comlecting sewer shall be laid parallel to any bearing wall or footing unless further distant than three feet (3 ') from any such bearing wall or footing. No connecting sewer shall be laid within twenty feet (20') of any existing well. (Ord. 234, 8-6-57) E. Trenching and Backfilling: I. All excavations shall be open trench work unless otherwise authorized by the City Engineer. The foundation in the trench shall be fonned to prevent any subsequent settlement of the pipes. If the foundation is good and firm earth, the earth shall be pared or molded to give a full support to the lower third of each pipe. Bell holes shall be dug to provide ample space for pouring of joints. Care must be exercised in backfilling below the center line ofthe pipe in order to give it proper support. 2. Backfilling shall be placed in layers and solidly tamped or packed up to two feet (2') above the pipe. Backfilling shall not be done wltil the section to be backfilled has been inspected and approved by the Public Works Director. F. Use of Existing Sewer Services: Existing sewer services or portions of such sewers may be approved for use by the Public Works Director. The Public Works Director may request that the old sewer be excavated for the purpose of facilitating inspection. No cesspool or septic tank shall be connected to any portion of a house sewer that is also laid across or over any existing cesspool or septic tank, the existing cesspool or septic tank shall first be pumped clean and filled with earth to the surrounding ground level. Where a sewer is laid across or over any existing cesspool or septic tank, only material approved by the Public Works Director shall be used for that portion of the connecting sewer which is laid across or over the existing cesspool or septic tank. G. COlU1ections at "Y" Only: Every connecting sewer shall be connected to the Municipal sewer system at the "Y" designated for the property served by the connection, except where otherwise expressly authorized by the Public Works Director. Where expressly authorized by the Public Works Director, all connections made at points other than the designated "Y" shall be made only under the direct supervision of the Public Works Director in such manner as the Public Works Director may direct. H. Tunneling: Tunneling for distances of not more than six feet (6') is pennissible in yards, courts or driveways of any building site. When pipes are driven, the drive pipe shall be at least one size larger than the pipe to be laid. I. Independent Systems Required: 1. The drainage and plumbing system of each new building and of new work installed in an existing building shall be separate from and independent of that of any other building except where provided in this subsection and every building shall have an independent cOllilection with a public sewer when such is available. (Ord. 219, 9-4-56; amd. 1995 Code) 2. A separate connection shall be required for each dwelling unit constructed on or after