OFFICE OF THE CITY CLERK OF OMAHA - Douglas County

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SPECIAL PROVISIONS Project No. C-28(492) SUBGRADE PREPARATION This work shall be completed in accordance with the Plans and Section 202 of the Standard Specifications with the following exception: Subgrade preparation shall not be a direct pay item, but shall be subsidiary to items for which direct payment is made. The Contractor shall inspect all dikes after each rainfall event of at least 0.5 inches or greater. Any deficiencies or damage shall be repaired by the Contractor. Accumulated silt or debris shall be removed and relocated as directed by the Engineer. If the dikes are damaged or inadvertently moved during the silt removal process, the contractor shall immediately replace the damaged dikes. Method of Measurement and Payment The dikes shall be measured in Linear Feet placed and accepted for payment by the item ‘Triangular Silt Dike.’ Unit price bid shall include the cost of furnishing the dikes, installation, maintenance and removal as directed by the Engineer. 18" HDPE PIPE This work shall consist of the furnishing and installing of 18" HDPE Pipe at the lines and grades shown in the Plans or as directed by the Engineer. This work shall be accomplished in accordance with Section 701 of the Standard Specifications. The HDPE Pipe used shall also meet the material requirements listed in Section 1038 of the Nebraska Department of Roads Standard Specifications for Highway Construction, 2007 Edition. Measurement and Payment Payment shall be made at the contract unit price per linear feet (LF) for the item “18" HDPE Pipe”. This price shall be full compensation for furnishing, hauling, and placing the culvert pipe and for all equipment, tools, labor and incidentals necessary to complete the work. 18" FLARED END SECTION This work shall conform with Section 701 of the Standard Specifications, with the following exception: The Flared End Section used for this work shall be of metal construction and manufactured specifically for use with HDPE pipe. TEMPORARY 18" CULVERT PIPE Description This work shall consist of the construction, maintenance, and removal of 18" Culvert Pipe at the lines and grades shown in the Plans or as directed by the Engineer. The type of culvert pipe utilized can be any of the types 1 through 7 accepted for these conditions according to the Nebraska Department of Roads Pipe Material Policy. Previously used pipe may be utilized if approved by the Engineer. Measurement and Payment Payment shall be made at the contract unit price per linear feet (LF) for the item “Temporary 18" Culvert Pipe”. This price shall be full compensation for furnishing, hauling, placing, maintaining, and removal of the culvert pipe and for all equipment, tools, labor and incidentals necessary to complete the work. SP - 6
SPECIAL PROVISIONS Project No. C-28(492) AGGREGATE SURFACE COURSE FOR TEMPORARY SURFACE Description This work shall consist of the construction, maintenance, and removal of the temporary road shown in the Plans or as directed by the Engineer. Surfacing shall be a thickness of 3 inches and comply with Section 302 of the Standard Specifications. The contractor shall be required to perform the necessary grading and shaping to accommodate the temporary road as shown in the Plans or as directed by the Engineer. The contractor shall maintain the temporary driveway to a condition passable by vehicular traffic. This may include, but is not limited to, additional grading and resurfacing of the temporary road. At the appropriate time when the temporary driveway is no longer required, the engineer will direct the contractor to obliterate the temporary driveway and restore the area to it's previous condition. Measurement and Payment Payment shall be made at the contract unit price per ton for the item “Aggregate Surface Course For Temporary Surface”. This price shall be full compensation for grading, furnishing, hauling, placing, maintaining, and obliteration of the temporary driveway and for all equipment, tools, labor and incidentals necessary to complete the work. TRIANGULAR SILT DIKE Description This work shall consist of furnishing, installing, maintaining, and when required, removal of the ‘Triangular Silt Dike.’ The dikes shall be used as a continuous line barrier at the toe of slope or R/W line to contain sediment or as a ditch barrier placed perpendicular to the flow of water in a defined drainage ditch to minimize erosion and contain sediment. These dikes shall be installed and located as soon as construction will allow or as directed by the Engineer. Materials ‘Triangular Silt Dikes’ shall have a height of at least eight (8) inches in the center with equal sides and a sixteen (16) inch base. The triangular shaped inner material shall be urethane foam. The outer cover shall be a woven geotextile fabric placed around the inner material and allowed to extend beyond both sides of the triangle two to three (2-3) feet. The dikes shall be attached to the ground with wire staples. The staples shall be No. 11 gauge wire and be at least six (6) inches long. Staples shall be placed as indicated per the manufacturer’s detail. SILT FENCE This work shall be completed in accordance with the Standard Specifications, with the following exception: Silt Fence designated in the plans as High Porosity shall be listed on the Nebraska Department of Roads Approved Products List. SP - 7
Page 1 and 2: DOUGLAS COUNTY ENGINEER 15505 WEST
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OFFICE OF THE CITY CLERK OF OMAHA - Douglas County

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