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- mixed on-site, equipment and mixing procedures shall conform to ACI 301, Chapter 7. If 'ready mix' is used, it shall be mixed and transported in accordance with ASTM C 94. Concrete shall be thoroughly compacted by means of a suitable mechanical vibrator. - Upon completion of concrete curing, the dirt excavated from the embankment shall be replaced on top of the new concrete. The material shall be replaced in such a manner so that the slope of the embankment is returned to its original condition, and so that the top of the CMP riser is six inches (6") above the elevation of the embankment slopes. The fill shall be mechanically compacted during placement. - A hinged steel grate shall be placed over the top of the CMP riser. The grate shall be constructed using 1-1/4" structural rebar welded on eight-inch (8") centers in both directions. Two (2} extra heavy-duty hinges, having non-removable pins shall be welded to the CMP riser and to the steel grate cover on the uphill side of the riser. A hasp, constructed of 3/8" steel, and having a circular hole of Y:" diameter, shall be welded to the CMP riser and the steel grate on the down hill side of the riser. Measurement and Payment There will be no measurement for payment. Payment for this task will be reflected in a lump sum bid under Item 3 on the Bid Schedule. This lump sum bid will cover all costs for cutting of the CMP riser, offsite disposal of the excess CMP material, excavation of the embankment, form construction, purchase and installation of the bentonite, purchase and installation of the concrete, backfilling and compaction over the concrete, construction and installation of the hinged steel grate. Payment shall be as this task is completed and approved by the PROJECT MANAGER. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the completion of Task 3, Sediment Pond Dewatering Device Repair. Task 4 Sealing Sediment Pond In order to minimize the infiltration of water from the sediment pond, bentonite will be placed within the pond. Bentonite shall be placed on the base of the pond and up the side slopes to the elevation of the lowest inlet of the CMP riser. CONTRACTOR shall ensure that the pond is free of water prior to initiating this Task. Upon completion of dewatering, if necessary, CONTRACTOR shall stake the elevation of the side slopes of the pond at the elevation of the lower most inlet to the CMP riser. In order to ensure that the proper elevation is established, the use of a tripod mounted surveyors level is required. The surface area of the pond to be affected by this Task shall be scarified to a depth of four inches (4") through the use of a disc harrow. Two inches (2") of dry bentonite shall be placed on the '. prepared work area after the discing is completed. This material will be worked into the base and side slopes of the pond by discing the affected area until the bentonite is well incorporated into the scarified surface. Measurement and Payment There will be no measurement for payment. Payment for this task will be reflected in a lump sum bid under Item 4 on the Bid Schedule. This lump sum bid will cover all costs for identifying the area to be affected by this Task, preparation of the area, and purchase and installation of the bentonite materials. Payment shall be as this task is completed and approved by the PROJECT MANAGER. Such payment shall be considered full compensation for all labor, materials,