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200204993 specifications approved by the Director of Public Works. The city Public Works Department will advertise the work for bids, administer the contract, make all contractor payments, and prepare the special assessment schedule. The city Public Works Department shall be paid four percent (4 %) of the total contract amount for providing their services. 5. Storm Drainage. The Subdivider agrees to construct a private storm water sewer system in accordance with plans and specifications approved by the Director of Public Works and grade the subdivision in conjunction with the developments proposed thereon so that storm drainage is conveyed to a public right -of -way or to other drainage systems so approved by the Director of Public Works. The storm sewer system shall be privately owned and maintained by the Subdivider. 6. Sidewalks. The Subdivider shall install all public sidewalks as required by the City of Grand Island when the lots are built upon, and such sidewalk shall be regulated and required with the building permit for each such lot. 7. Flood Plain. Since the subdivision is within a delineated flood plain, all structures constructed shall have the lowest floor elevation to a minimum of one foot above the elevation of the 100 -year flood as determined by the building permit received by the Subdivider or successors from the Building Department under the provisions of Section 2- 1506.06, R.R.S. 1943. No basement shall be constructed in connection with any structure in the flood plain unless such basement is floodproofed and certified as such by a qualified engineer or architect. 8. Engineering Data. All final engineering plans and specifications for public improvements shall bear the signature and seal of a registered professional engineer and shall be furnished by the Subdivider to the Department of Public Works for approval prior to contracting for -4-