for Highway Construction Page 525 of 715 SECTION 622 – PRECAST CONCRETE HEADGATES
622.01 Description.
Provide and install precast concrete headgates.
622.02 Materials.
Provide materi al as specified in 509.
622.03 Construction Requirements.
Shape the area to be occupied by the headgate to conform to the structure and to provide a firm and uniform bearing over its entire area. Backfill and compact the dike or ditch aro und the structure t o avoid undercutting or erosion.
622.04 Method of Measurement.
The Engineer will measure acceptably completed work per each, including 1 length of pipe in addition to the pipe cast in the headwall.
622.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit prices as follows: Pay Item Pay Unit _____ Precast Concrete Headgate ........................................................ Each Structure excavation, ba ckfill, and compacting backfill are incidental and the cost included in the precast concrete headgate contract unit price. for Highway Construction Page 526 of 715 SECTION 623 – CONCRETE SLOPE PAVING
623.01 Description.
Construct concrete slope paving around structures and on embankments.
623.02 Materials.
Provide materials for concrete slope paving as specified in 509. Provide No. 5 coarse aggregate for those portions of slope paving designated as exposed aggregate. Provide Class 22 concrete for slope paving with 4 to 7 percent entrained air. When colored concrete is specified, provide colorants and submit a color panel for approval. Where exposed aggregate slope paving is specified, submit the method of obt aining the finish and an exposed aggregate panel for approval. Provide preformed- expansion joint filler s as specified in 704.01. The Contractor may use sound cedar or redwood.
623.03 Construction Requirements.
Construct as specified i n 509. Grade the slope paving area and compact to 90 percent density as specified in 205. As soon as the desired exposed aggregate surface has been attained and washed, cure the concrete surface as specified in 509.
623.04 Method of Measurement .
The Engineer will measure acceptably completed work by the square yard of finished surface, measured in the plane of the finished surface.
623.05 Basis of Payment .
The Department will pay for the accepted quantiti es as follows: Pay Item Pay Unit Concrete Slope Paving ........................................................................... SY
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