656.01 Description.
necessary to complete the work. Additional fertilizer or agricultural limestone ordered by the Engineer will be paid at the verified invoice price plus 15 percent.
b.Payment will be made under Item No .: 654-A Solid Sodding - per square yard {square meter} MULCHING FOR VEGETATION ESTABLISHMENT
656.01 Description.
This Section shall cover the work of furnishing and placing mulching materials over the soil surface to provide protection from soil erosion and to aid in retention of soil moisture for vegetation establishment.
656.02 Materials.
Mulch materials shall be furnished in compliance with the requirements given in Article 860.03. A list of acceptable Hydraulic Mulch pro ducts, Mulch Control Netting and Tackifiers (List II -20, “TACKIFIERS, MULCH CONTROL NETTING, AND HYDRAULIC MULCH PRODUCTS”) is given in the ALDOT manual titled “Materials, Sources, and Devices with Special Acceptance Requirements”.
656.03 Construction Requ irements.
a.Mulching Operations . Seeded areas shall be covered with mulch within 48 hours after seeding. Mulch shall be applied at the rates required below for the type of mulch used. Mulch shall be furnished to effectively control erosion and promote th e establishment of vegetation. Dry blown mulch shall be stabilized by crimping, by the application of a tackifier adhesive, or by anchoring with a mulch control netting, with the following exceptions: crimping shall only be allowed on slopes 3:1 or flatter , and tackifier adhesive shall be required for applications within 10 feet {3 meters} of traffic. During crimping operations, care shall be taken to follow as closely as possible to the contours of the mulched surface. Crimping shall result in the mulch be ing securely lodged into the soil providing both erosion protection and promotion of vegetation establishment. Tackifier adhesive shall be applied at the rate recommended by the manufacturer. Hydraulic Mulch products shall be applied in accordance with man ufacturer recommendations, typically in opposing directions to provide a solid blanket of mulch product. Hydraulic Mulches may be used within 10 feet {3 meters} of traffic as an alternate to dry blown mulch with tackifier adhesive. Hydraulic Mulches and ta ckifiers shall not be installed in areas subject to channelized flow or areas having a potential to flood during a local 2 year, 24 hour storm event.
b.Rate of Mulch Application . Dry blown mulch shall be applied at a rate of not less than 2 tons per acre {4500 kg/ha}. Proof of material weight shall be provided to the Engineer by the Contractor upon delivery of the materials to the project site. The weight ticket shall contain all items required in Item 109.01(h)2. with the exception of the name of the pro ducer and the truck number. Hydraulic Mulch products shall be applied at the rate designated by the manufacturer for the specific slope where they are being applied to provide a solid blanket of the mulch product with no soil showing. In no case shall the applied rate be less than 1 ton per acre {2250 kg/ha} for hydraulically applied mulches. The application rate will be verified by using the air dry weight {mass} per pound {kilogram} and dividing by the surface dimensions of the area covered.
c.Equipment . Dry blown mulch shall be applied with a mechanical mulch spreader designed to break up balls or clusters of mulch. If a tackifier adhesive is used to secure the mulch, the mulch spreader shall be equipped to apply the adhesive effectively to the mulch to form a uniform, porous and stable mulch blanket held in place by the adhesive. The adhesive may also be applied hydraulically after mulch application. Crimpers shall be roller -type devices equipped with flat, uncupped, dull edged disks. The disks shall have a minimum width of 1/4 of an inch {6 mm} and shall be placed a maximum of 8 inches {200
659.02 Materials.
mm} apart along the axle or shaft. Crimpers shall be specially designed so that by adding weight {mass} or using hydraulic force from the tractor the mulch will be imbedded a minimum of 2 inches {50 mm} into the ground. The diameter of the disks shall be large enough to prevent the axle or shaft from dragging or in any way disturbing the mulch or soil. Under no circumstances shall a disc harrow be used to per form the crimping operation. Hydraulic mulch application shall be performed using equipment designed for this purpose and that is in compliance with the recommendations of the mulch product manufacturer.
656.04 Method of Measurement.
Mulch will be measured by the acre {hectare} of the finished surface dimensions of the area ordered treated.
656.05 Basis of Payment.
a.Unit Price Coverage . Mulch will be paid for at the contract unit price which shall be payment in full for materials, including tackifiers or mulch control netting (if used), equipment, tools and labor necessary to furnish, place and maintain the mulch. Payment for this work will be made upon satisfactory application of the mulching.
b.Payment will be made under Item No .: 656-A Mulching - per acre {hectare} SECTION 659 ROLLED AND HYDRAULIC EROSION CONTROL PRODUCTS
659.01 Description.
This Section shall cover the work of furnishing, installing, and maintaining Rolled Erosion Control Products (RECPs) and Hydraulic Erosion Control Products (HECPs). RECPs and HECPs will be referred to as “erosion control products” in this section. Areas to be covered by erosion control produc ts (ECPs) will be shown on the plans or will be designated by the Engineer.
659.02 Materials.
a.Acceptable Erosion Control Products . Erosion control products shall be furnished in compliance with the requirements given in Article
860.11 A list of accept able erosion control products (LIST II -11 "ROLLED AND HYDRAULIC EROSION
CONTROL PRODUCTS") is given in the ALDOT manual titled "Materials, Sources, and Devices with Special Acceptance Requirements". Information concerning the list and manual is given in Su barticle 106.01(f) and ALDOT -355 "General Information Concerning Materials, Sources, and Devices with Special Acceptance Requirements".
b.Utilization of Erosion Control Products . Erosion control products shall utilized as the final stabilization layer in conjunction with the required permanent vegetation.
1.Degradable Erosion Control Products . Degradable ECP's shall be furnished to effectively control erosion and enhance the establishment of vegetation during a defined minimum period of time called "func tional longevity". The Contractor shall be responsible for selecting approved ECPs with a functional longevity of sufficient duration to allow establishment of permanent vegetation prior to product degradation or as shown on the plans or as designated by t he Engineer.
2.Permanent Erosion Control Products . Permanent ECPs shall be furnished to effectively control erosion, enhance the establishment of vegetation, and permanently reinforce vegetation for applications where permanent vegetation alone will not p rovide sufficient protection against anticipated erosive forces.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 553–553 of 934.