In-Depth Review 2022 Section 230 158 SECTION 230
230.01 Description
This work consists of scarifying, shaping, compacting, and maintaining the subgrade, or reshaping an existing roadway before constructing a base, or surface course.
230.02 Equipment
Equipment Section Roadbed Planer 153.02 Provide a general purpose moldboard plow capable of plowing to a depth of 12 inches or more that will completely lift, invert, and throw the soil to the side. Provide a heavy duty disk capable of breaking up and evening out the plowed surface.
230.03 Materials
Reserved.
230.04 Construction Requirements
A.Reshaping Roadway. Reshape roadway, ditches, and slopes. Remove and dispose of the following: − Rocks larger than 4 inches in their longest dimension; − Roots; and − Deleterious material. Fill and compact holes and depressions with approved material. Compact the soil as specified in Section 203.04 G.2, “Compaction Control, Type A.”
B.Shoulder Preparation. Spray herbicide to kill all vegetation and roots on the pavement slough and within 2 feet of the outside edge of the slough. Mix and apply the herbicide according to the manufactur e's recommendations. Spray the herbicide in two applications that are three weeks apart. Complete spraying no more than 30 days before starting paving operations. Take precautionary measures to prevent any damage to adjacent vegetation caused by the sprayi ng operation. Till or disk the area beginning at the bottom of the existing pavement slough to a distance between 2 and 4 feet down the foreslope. Move the disturbed material away from the pavement slough before placing the overlay. Replace the disturbed material within 14 days of initial. Provide a smooth transition between the top of the pavement slough and the existing inslope. Remove all materials that will interfere with a smooth transition. In-Depth Review 2022 Section 230 Remove all weeds, grass, dirt, and deleterious m aterial from the shoulders. Do not remove more than one inch depth of shoulder material. Remove sod chunks larger than 36 square inches on any surface.
C.Reshaping Foreslopes. Use existing material to provide a smooth transition between the finished shoulder and the existing foreslope.
D.Subgrade Preparation – Type A. Scarify, shape, and compact the subgrade to the specified depth. Scarify the subgrade with a moldboard plow and heavy duty disk. Manipulate the subgrade in 6 inch lifts and compact the subgrade as specified in Section
203.04 E.2, “Compaction Control, Type A”. Shape the subgrade to drain at the end of each
day. Shape and compact private drives, minor road approaches, and areas of irregular dim ension or restricted access according to Section 203.04 E.4, “Compaction Control, Type C”. Remove deleterious materials and rocks from the subgrade. Construct the final subgrade elevation to within 0.08 feet of the proposed subgrade elevation. Obtain approval of the final subgrade surface before placing base or surface material.
E.Subgrade Preparation – Type B. Construct as specified in Section 230.04 D, “Subgrade Preparation – Type A” and trim the subgrade with a roadbed planer. The Engineer may permit a base or surface course to be used as a grade reference for trimming the shoulders.
F.Subgrade Preparation – Type C. Construct as specified in Section 230.04 D, “Subgrade Preparation – Type A” . Trim the subgrade with equipment using automatic grade control of the cutting edge.
230.05 Method of Measurement
The Engineer will measure as specified in Section 109.01,”Measur ement of Quantities” and as follows:
A.Shoulder Preparation. The Engineer will measure each shoulder separately.
B.Reshaping Foreslopes. The Engineer will measure each foreslope on each side of the roadway separately. In-Depth Review 2022 Section 230 160 C. Subgrade Preparation. The Engineer will not measure areas outside the roadbed, such as private drives, road approaches, road tapers, and ramps.
D.Subgrade Preparation- Type A - Shoulders. The Engineer will measure each shoulder separately.
230.06 Basis of Payment
Pay Item Pay Unit Reshaping Roadway Station, Mile Reshaping Foreslope Station, Mile Shoulder Preparation Station, Mile Subgrade Preparation -Type__ Station, Mile Subgrade Preparation -Type A Shoulders Station, Mile Include the cost of removing, and stockpiling, along the reshaped foreslopes in the price bid for the reshaping or subgrade preparation items. Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. Section 251 161 SECTION 251 SEEDING
251.01 Description
This work consists of seeding disturbed areas.
251.02 Equipment
A.Class I, II, III, and Wetland Seed Mixture Equipment. Use a grass drill equipped with double disk furrow openers that are: − Spaced no greater than 8 inches apart; − Individually mounted; − Adjustable; − Spring loaded; − Capable of planting seeds at depths between 1/4 and 3/4 inches; and − Packer wheels meeting one of the following requirements: • Mounted individually to each furrow opener and have an adjustable spring tension; or • Mounted independently with a press wheel positioned to follow directly behind each furrow opener. Equip the seed box with: − A positive feed mechanism that meters seed in a uniform manner with agitators that prevent seed bridging; and − Baffles or partitions that keep all seeds uniformly mixed during drilling. If chaffy native grasses (sideoats grama, big bluestem, or Indiangrass) are part of the seed mixture, equip the seed box with a positive picker -wheel mechanism with oversize teeth and auger style agitators that meters the chaffy native grasses either in a mixture or separately in a uniform manner.
B.Temporary Cover Crop Seed Mixture Equipment. Use a seed drill that provides a uniform flow of seed at the required rate and a planting depth between 1/2 and 1 1/2 inches.
251.03 Materials
A.General. Furnish seed that meets or exceeds Pure Live Seed requirements for the specified seed. Use seed that contains no prohibited noxious weed seeds and contains less than 25 seeds per pound of restricted noxious weed seeds. North Dakota Department of Agriculture classifies noxious weeds at www.nd.gov/ndda . The Engineer will not accept seed that is wet, moldy, or damaged.
B.Seed Testing. Provide seed that has been tested for purity and germination within 12 months of the planting date by one of the following methods:
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 193–195 of 550.