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• "The quantities of pipe culvert to be paid for under this Section shall be the plan quantity in feet of concrete Pipe Culvert and Corrugated Aluminum Pipe Culvert subject the provisions of 9-3.2. Any additions or deletions thereto, as authorized by the Engineer, shall be • determined by plan dimensions, final measurement, or any combination thereof, as measured along the centerline of the completed and accepted pipe." • Lifting holes on pipe culverts shall be grounds for rejection of pipe. ASTM Specification C- 76 -85A and AASTM Specification M170-89 are modified by the following: " "The exposure of the ends of the longitudinal stirrups or spaces that have been used to position the cages during the placement of the concrete may be a cause for rejection by the Project Engineer. During construction, the Contractor is to maintain the storm sewer void of any silting material. Prior to final acceptance the Contractor or Engineer shall inspect and certify that • the storm sewer is free of any construction material or debris and operates in a functional manner. Contractor shall remove silt and other material from sewer at no cost to Owner. Compensation shall be included in the maintenance of traffic lump sum item. • D. Aluminum Oil Skimmers: Aluminum Oil Skimmers shall be used where indicated in the plans and shall conform to the following provisions: The Work consists of the fabrication, cutting, bending, furnishing and installing oil skimmers on drainage structures as detailed on the Plans. The Contractor shall use all new materials for the posts and facing materials for the oil skimmer. The Contractor is responsible for the • use of materials and methods necessary for the long term maintainability of the units. Oil skimmers shall be constructed of corrugated aluminum. They shall be constructed to • the liens and grades as shown on the Plans. The skimmers include all labor and materials including mounting fasteners, brackets, posts bonding adhesives, Class III concrete for posts and all other items necessary for the construction of the completed skimmer. • Material • The skimmers shall be constructed of 12 gauge 2-2/3" x'/:" corrugated aluminum. r Basis of Payment The compensation for the furnishing, bending, fabrication and installation of materials as well as the labor involved for placement are considered incidental to the contract drainage items as shall be included in the unit price for the associated drainage structure. r • • C