In-Depth Review 2022 Section 210 152 SECTION 210 STRUCTURAL AND CHANNEL EXCAVATION, FOUNDATION FILL AND PREPARATION
210.01 Description
A.Structural Excavation.
1.Class 1: Class 1 excavation will be defined in the plans.
2.Class 2: Class 2 excavation will be defined in the plans.
3.Box Culvert Excavation: Excavation and ordinary backfill required for installation of box culverts.
B.Channel Excavation. Channel excavation will be designated on the plans and includes excavation necessary to place riprap or aggregate cushions and to flatten and shape slopes around abutment locations.
C.Foundation Preparation. Foundation preparation will be designated for installation of a box culvert or bridge.
210.02 Equipment
Reserved.
210.03 Materials
A.Ordinary Backfill. Use approved material from the excavation. Use borrow material as specified in Section
203.04 D, “Borrow Excavation” if additional material is required.
B.Foundation Fill. Use CL 3 or CL 5 aggregate as specified in Section 816, “Aggregates” .
210.04 Construction Requirements
A.Excavation.
1.General. Perform excavation so that concrete can be placed in a dry area free of water. If excavation has been performed to the specified elevation and unsuitable material is encountered, remove the unsuitable material and place foundation fill to the specified elevation. Dispose of unsuitable excavated material as specified in Section 107.17, “Removed Material” . In-Depth Review 2022 Section 210 153 2. Class 1 and 2 Excavation. If footings are to be placed on an excavated surface and the excavated surface is disturbed, scarify the area and compact the material using a mechanical tamper. Perform final preparations of the foundation bed just before placing concrete. When foundation piles are specified the bottom of the excavation may be extended below the footing to allow for heaving. Perform the extended excavation and place additional required backfill at no additional expense to the Department. Use all suitable excavated material for backfilling in areas where ordinary backfill is specified. Dispose of remaining suitable excavation as specified in Section 107.17, “Removed Material” .
B.Backfill.
1.General. Place backfill material in an area free of water using tamping equipment that will not cause a wedging action of the material against the structure. Place backfill material after the concrete has reached 70 percent of its design strength. Place backfill material around box culverts after the roof has reached 70 percent of its design strength. If a wall depends on a superstructure for support, release the falsework before placing backfill material. When placing of backfill material is required on only one side of a structure, compact backfill material without placing excessive pressure on the structure. Place fill adjacent to a bridge abutment no higher than the berm elevation in front of the abutment until the superstructure is in place. If foundation fill is not specified, backfill using ordinary backfill.
2.Ordinary Backfill. Place ordinary backfill in layers not exceeding 6 inches of compacted material .
3.Foundation Fill. Place foundation fill in layers not exceeding 6 inches. Compact material to at least 90 percent of the maximum dry density with a moisture content not less than 2.0 percentage points below optimum moisture and no more than 3 .0 percentage points above the optimum moisture. The Engineer will determine the maximum dry density and optimum moisture content as specified in ND T 180.
C.Foundation Preparation. Perform all work necessary to proper ly stage and maintain a site for construction of a structure. Construct and remove temporary features necessary to facilitate construction of the structure. Backfill the site as specified in the plans and Section 210.04 B, “Backfill” . Dispose of excess and waste materials as specified in Section 107.17, “Removed Material” . In-Depth Review 2022 Section 210 154 210.05 METHOD OF MEASUREMENT The Engineer will measure as specified in Section 109.01, “Measurement of Quantities” and as follows:
A.Foundation Fill. The Engineer will measure foundation fill completed and in place. The Engineer will not measure beyond the excavation limits for payment.
B.Channel Excavation. The Engineer will not measure beyond the excavati on limits for payment.
210.06 Basis of Payment
Pay Item Pay Unit Channel Excavation Lump Sum, Cubic Yard Class __ Excavation Lump Sum, Cubic Yard Foundation Preparation Lump Sum Foundation Fill Ton, Cubic Yard Include dewatering of the construction site in the contract unit price for “Foundation Preparation”. Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. In-Depth Review 2022 Section 216 155 SECTION 216 WATER
216.01 Description
This work consists of using water for dust control and to obtain proper moisture content and compaction.
216.02 Equipment
Equipment Section Water Trucks 152.01 B
216.03 Materials
Reserved.
216.04 Construction Requirements
Apply water in sufficient quantity to secure and maintain proper moisture content or dust control.
216.05 Method of Measurement
The Engineer will measure water: - In calibrated tanks; - By weighing and converting to gallons at the rate of 8.33 pounds per gallon; or - By an approved metering device placed in the supply line. Before using a water metering device, furnish a certified statement that the device conforms to AWWA requirements. The statement must show that the device has been calibrated within the past year. Should subsequent measurements prove unreliable, furnish another certified device producing satisfactory measurements.
216.06 Basis of Payment
Pay Item Pay Unit Water M Gal An “M Gal” is equivalent to 1,000 gallons. Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified .
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 187–189 of 550.