MULCHING 233.03 The Department will pay for water used to water seeded areas in accordance with Section 230, “Sodding and Sprigging.” Include the cost of water used as a carrier in hydraulic seeding operations in the contract unit price for Seeding Method A . Include the cost of hand broadcasting seed in the contract unit price for the appropriate seeding pay items. The Department will pay for fertilizer in accordance with Section 234, “Fertilizing and Agricultural Liming,” and mowing in accordance with Section 241, “Mowing.”
233.01 Description
This work consists of providing, applying, and fastening mulching materials to the soil surfac e.
233.02 Materials
Provide materials in accordance with the following subsections: Material: Subsection: Vegetative Mulch 735.04 Excelsior Mat 735.04 Excelsior Mulch 735.04 Wood Cellulose Fiber 735.04 Mulch Fasteners 735.05
233.03 Equipment
Provide equipment in accordance with the following:
A.Equipment for Vegetative and Excelsior Mulch Use the following equipment methods to dist ribute vegetative and excelsior mulch:
1.Adhesive Spray Method Apply and fasten vegetative and excelsior mulch using a machine that includes a blower to distribute the vegetative material and a pump to distribute the liquid adhesive. Arrange the dischar ge pipe of the blower and the discharge nozzles of the liquid adhesive hoses so that the liquid adhesive is evenly distributed into the mulch as it emerges from the blower discharge spout. Ensure the hoses can distribute the liquid adhesive at the specifi ed rate. Ensure the machine can operate the liquid adhesive pump and the mulch blower, and distribute the liquid adhesive -bound mulch at the specified rate over the areas indicated with one pass of the machine. Do not allow the beater mechanism to shorte n the stem lengths of the vegetative material.
233.04 Mulching
2.Mulching Tiller Method Ensure the machine for applying vegetative or excelsior mulch meets the specifications for “Adhesive Spray Method,” except that the Department will not require a liquid adhesive pump or accessories. Use a mulching tiller that is a heavy disk -type roller with flat disks about ¼ in [6 mm] thick and spaced no more than 12 in [300 mm] apart.
B.Equipment for Wood Cellulose Fiber Mulch To apply wood cellulose fiber mulch, use factory -designed hydraulic equipment with enough pump capacity to apply the specified quantities. Use a slurry tank that holds at least 1,000 gal [3.8 kL] and includes a mechanical agitation system that can suspend and homogeneously mix the mulch and wate r. Ensure the slurry distribution hoses are large enough to prevent clogging and include spray nozzles that will evenly distribute the slurry. Mount the equipment on a traveling unit. Ensure the traveling unit can apply wood cellulose fiber mulch without tracking into the mulching area.
233.04 Construction Methods
A.Mulching Operation Before applying the mulch material as temporary erosion control, repair eroded areas and clear debris that might hinder a uniform mulch application. Apply the mulch materi al within 24 hr after seeding or sodding if using mulch over seeding or sodding. If mulched areas become damaged, reshape the area, seed or sod, and mulch again as originally specified. Do not perform mulching operations during conditions that will resul t in a non -uniform application or wasted material.
B.Type of Application The following are accepted methods of application:
1.Adhesive Spray Method for Excelsior and Vegetative Mulch Broadcast the vegetative or excelsior mulch into a continuous cover of uniform thickness. Apply the mulch at the rate of 2 ton/acre [4.5 metric ton/ha]. During the spreading operation, inject the adhesive material into the mulch at the mulch blower discharge spout to uniformly distribute it throughout the mulching material . If the Department requires the use of other fastener types, the Plans will show the type and quantity. Promptly remove clumps of excess material.
2.Mulching Tiller Method for Excelsior and Vegetative Mulch Spread the mulching materials uniformly in accordance with Subsection 233.04.B(1), “Adhesive Spray Method for Excelsior and Vegetative Mulch.” Apply at a rate of 2.5 ton/acre [5.6 metric ton/ha] for vegetative mulch, or 2 ton/acre [4.48 metric ton/ha] for e xcelsior mulch. Immediately after the mulch -spreading operation, till the mulched area to press the material 3 in [75 mm] into the soil. Use a disk plow to till impermeable soil before spreading and tilling the FERTILIZING AND AGRIC ULTURAL LIMING 234.02 mulch. If mulching loose, sandy soil, do n ot exceed the mulch application rate. If mulching slopes, operate the tiller along the contour of the slope.
3.Wood Cellulose Fiber Mulch Complete seed, fertilizer, lime, and other erosion control items before applying cellulose material. Apply wood cel lulose fiber mulch at a rate of at least 2,000 lb./acre [2,241 kg./ha] of air -dry material. Disperse, suspend, and apply the material using water at the rate of 3.3 gal to 1 lb [27.5 L to 1 kg] of material. Apply the cellulose fiber to form a uniform lay er over the area indicated.
4.Excelsior Mat Place the mat so that the fibers are in contact with the soil and the netting is on the top. Place each strip of mat parallel to the direction of the flow of water.
233.05 Method of Measuremen T - Vacant
233.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.VEGETATIVE MULCHING Acre [Hectare]
B.EXCELSIOR MULCHING Acre [Hectare]
C.WOOD CELLULOSE FIBER Acre [Hectare]
D.EXCELSIOR MAT Square Yard [Square Meter] SECTION 234 FERTILIZING AND AGRICULTURAL LIMING
234.01 Description
This work consists of providing and applying fertilizer or agricultural liming materials.
234.02 Materials
Provide materials in accordance with the following subsections: Material: Subsection: Fertilizer 735.06.A Agricultural Limestone 735.06.B Hydrated Lime 735.06.B
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 181–182 of 935.