CATEGORY 300 DRAINAGE SECTION 309 — CONCRETE DITCHES
309.01 Description
Construct concrete ditches and incidental toe walls.
309.02 Materials
Crusher Run Aggregate CR-6 901.01 No. 57 Aggregate 901.01 Curing Materials 902.07 Form Release Compounds 902.08 Portland Cement Concrete 902.10, Mix No. 2 Joint Sealer 911.01 Preformed Joint Filler 911.02 Borrow Section 916 Soil Stabilization Matting 920.05
309.03 Construction
309.03.01 Excavation. Excavate and prepare the subgrade as specified in Section 602. For
excavated material, refer to 402.03.01. 309.03.02 Forms. Use steel or wooden forms meeting Section 603.
309.03.03 Concrete. Mix and place as specified in Section 603.
309.03.04 Joints. Place joints no more than 15 ft apart. Use either bulkhead or weakened plane
construction joints. Either tool or saw weakened plane joints to a depth of at least 3/4 in. Place expansion joints no more than 90 ft apart and seal.
309.03.05 Cold Weather Construction and Curing. Refer to 520.03.02 for cold weather
construction and to 520.03.12 for concrete curing. 309.03.06 Backfill. After the forms have been removed, place and compact the backfill. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
309.03.07 When the existing concrete ditch is removed but not replaced, regrade and stabilize the
area as directed.
309.04 Measurement and Payment
The payment will be full compensation for all concrete, excavation, forms, backfill, curing, disposal of excess or unsuitable material, toe walls, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
309.04.01 Concrete Ditches will be measured and paid for at the Contract unit price per square
yard. 309.04.02 The removal and disposal of unsuitable material below the subgrade will be measured and paid for at the Contract unit price per cubic yard for Class 2 Excavation. 309.04.03 When Borrow or Selected Backfill using No. 57 Aggregate or Selected Backfill using Crusher Run Aggregate CR-6 is approved by the Engineer as replacement material for the Class 2 Excavation, it will be measured and paid for at the Contract unit price per cubic yard for the pertinent items as specified in the Contract Documents.
309.04.04 Concrete Ditches removed but not replaced will be paid for at the Contract unit price
per square yard. The payment will include the cost to dispose of the material, regrading, topsoil, and soil stabilization matting. 310 — CONCRETE SLOPE AND CHANNEL PROTECTION CATEGORY 300 DRAINAGE SECTION 310 — CONCRETE SLOPE AND CHANNEL PROTECTION
310.01 Description
Protect slopes and channels with cast in place concrete and cutoff walls.
310.02 Materials
Crusher Run Aggregate CR-6 901.01 No. 57 Aggregate 901.01 Curing Materials 902.07 Form Release Compound 902.08 Portland Cement Concrete 902.10, Mix No. 2 Welded Steel Wire Fabric 908.05 Joint Sealer 911.01 Preformed Joint Fillers 911.02 Roofing Paper 911.07 Borrow Section 916
310.03 Construction
310.03.01 Excavation. Excavate, including excavation for cutoff walls, as specified in
Section 602. Refer to 402.03.01 for excavated material. 310.03.02 Cast In Place Concrete. Construct cast in place concrete slope protection in alternate strips so that construction joints are all in one direction and that tooled joints run perpendicular to the construction joints. The result shall be a checkerboard pattern having squares of at least 3 ft but not more than 5 ft. The Engineer will determine the size of the squares and the size of squares around curved surfaces. Construct joints and cutoff walls as specified.
310.03.03 Forms. As specified in Section 603.
310.03.04 Concreting. Mix concrete as specified in 915.03.04. Volumetric batching and
continuous mixing will be permitted. Prior to placing the concrete, use acceptable methods to dewater areas that are subject to the infiltration of water. Spread and tamp, or otherwise 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS