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of the City which either directly or indirectly eventuates in such prohibited waste flowing into the metropolitan disposal system. 1010.10 Construction Requirements. Subd. 1 General. Those provisions of the state plumbing code, as contained in the building code of the City, which apply to the construction, alignment, grades,joints and connections of sewers and materials used therewith are hereby adopted by reference and made a part of this code as if set out here in full. Subd. 2 Use of Old House Sewers. Old house sewers or portions thereof may be approved for use by the plumbing inspector. The plumbing inspector may request that the old sewer be excavated for the purpose of facilitating inspection. No cesspool or septic tank shall be connected to any sewer connections. If any portion of a house sewer is laid across or over any existing cesspool or septic tank, the cesspool or septic tank shall first be pumped clean and filled with earth to the surrounding ground level. Where a connecting sewer is laid across or over any existing cesspool or septic tank, only extra heavy cast iron soil pipe, conforming to the A.S.T.M. Standard Specification A-74-42, shall be used for that portion of the connecting sewer which is laid across or over the existing cesspool or septic tank. Subd. 3 Connections at "Y" Only. Every connecting sewer shall be connected to the municipal sewer system at the "Y" or sewer connection stubs designated for the property served by the connection, except where otherwise expressly authorized in writing by the plumbing inspector. Connections authorized by the plumbing inspector shall be made only under his or her direct supervision and in the manner as he or she may direct. Subd. 4 Tunneling. Tunneling for distances of not more than six (6) feet shall be permissible 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. Subd. 5 Independent Systems. A. 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 as provided for in Subparts B and C of this subsection. B. Where one building stands to the rear of another building on an interior lot and no private sewer is available or can be constructed to the rear building through an adjoining alley, court, yard or driveway, the building drain from the front building may be extended to the rear building and the whole shall be considered as one building drain. Where such a building drain is extended, a clean-out shall be provided immediately inside the rear wall of the front building. C. Where adjoining property owners desire to construct a common sewer connection to service both properties, the owners may make written application to the Council for permission to construct the joint service connection. The Council may grant such a permit if it determines that the construction of the joint connection is reasonable and warranted under the existing conditions, and if independent connections were to be constructed, the minimum length of each connection would be at least one hundred (100) feet from the property line abutting the municipal sewer.