327 ALASKA 2020 SECTION 618
618-1.01 DESCRIPTION . Establish a perennial stand of grass or other specified living vegetative
cover, by seeding, in the areas indicated on the Plans. Maintain the cover for the term of the Contract.
618-2.01 MATERIALS. Use materials that conform to the Special Provisions and the following:
Seed Section 724 Fertilizer Section 725 Water Subsection 712- 2.01 CONSTRUCTION REQUIREMENTS
618-3.01 SOIL PREPAR ATION. Clear all areas to be seeded of stones 4 inches in diameter and
larger and of all weeds, plant growth, sticks, stumps, and other debris or irregularities that might interfere with the seeding operation, growth of grass, or subsequent maintenance of the grass - covered areas. Make areas to be seeded reasonably free of ruts, holes, and humps. When specified, apply topsoil acc ording to Section 620. Roughen the surface to be seeded by grooving the soil in a uniform pattern that is perpendicular to the fall of the slope. Use one or more of the following grooving methods prior to the application of seed:
1.Manual raking with landscaping rakes;
2.Mechanical track walking with track equipment; or
3.Mechanical raking with a scarifying slope board. Form one inch wide grooves spaced no more than six inches apart. You may round the top and bottom of slopes to facilitate tracking or raking and to create a pleasant appearance, but you may not disrupt drainage flow lines.
618-3.02 SEEDING SEA SONS. Seed and fertilize during the local growing season.
Do not seed during windy conditions or when climatic conditions or ground conditions would hinder p lacement or proper growth. Seed disturbed areas that require seeding within fourteen days of the permanent cessation of ground- disturbing activities in that area. Seed between May 15 and August 15, or obtain written approval from the Engineer to seed at a different date.
618-3.03 APPLICATION . Apply seed mix, fertilizer, and mulch (if required) at the rate specified
in the special provisions. If no seed mix, seed mix application rate, or fertilizer rate are specified in the special provisions, use the recom mendations of the Alaska Department of Natural Resources (DNR) and the Revegetation Manual for Alaska. Do not seed areas of bedrock, plant beds, and areas indicated on the plans as “no seeding”. Water and fertilizer required for application are subsidiary to the Seeding bid item. 328 ALASKA 2020 Use any of the following methods:
1.Hydraulic Method.
a.Furnish and place a slurry made of seed, fertilizer, water, and other components as required by the Special Provisions.
b.Use hydraulic seeding equipment that will maintain a continuous agitation and apply a homogeneous mixture through a spray nozzle. The pump must produce enough pressure to maintain a continuous, nonfluctuating spray that will reach the extremities of the seeding area with the pump unit located on the roadbed. Pr ovide enough hose to reach areas not practical to seed from the nozzle unit situated on the roadbed.
c.If mulch material is required, it may be added to the water slurry in the hydraulic seeder after adding the proportionate amounts of seed and fertilizer. A dd seed to the slurry mixture no more than 30 minutes before application.
d.Mix the slurry and apply it evenly.
2.Dry Methods.
a.Use mechanical spreaders, seed drills, landscape seeders, aircraft, cultipacker seeders, fertilizer spreaders, or other approved mechanical spreading equipment when seed and fertilizer are to be applied in dry form.
b.Spread fertilizer separately at the specified rate.
618-3.04 MAINTENANCE AND WATERING. Protect seeded areas against traffic by approved
warning signs or barricades. Repair surfaces gullied or otherwise damaged following seeding. Maintain seeded areas in a satisfactory condition until final acceptance of work. Water and maintain seeded areas. Water applied by this Subsection is a paid contract item. If, in the opinion of the Engineer, too much water is being applied, reduce amount of water as directed. Reseed areas not showing evidence of satisfactory growth within 3 weeks of seeding. Bare patches of soil more than 10 square feet in area must be reseeded. Erosion gullies over 4 inches deep must be filled and reseeded. Fill the entire erosion gully to surrounding grade, even the portions less than 4 inch deep. Contact DNR for advice or corrective measures, when seeded areas are not showing evidence of satisfactory growth. You are responsible for retracking, reseeding, refertilizing and remulching areas that do not show satisfactory growth, and those actions are subsidiary.
618-3.05 ACCEPTANCE. The Engineer will perform a visual inspection of seeding to determine
final stabilization. During the visual inspection each station and each side of the road will be considered a separate area. The Engineer will accept seeding that has become a vegetative matt with 70 percent cover density in the inspection area. Reseed areas that are not acceptable to the Engineer.
618-3.06 PERIOD OF E STABLISHMENT. Establishment periods extend for one complete
growing season following acceptable seeding. Employ all possible means to preserve the new vegetative matt in a healthy and vigorous condition to ensure successful establishment. Reseed areas that do not meet the specifications. Watering and reseeding after the final inspection are subsidiary. The Engineer may, but is not required to, determine the Project is complete except for the period of establ ishment, and issue a letter of final acceptance. After final acceptance, work or materials 329 ALASKA 2020 due under this subsection during any remaining period of establishment are considered warranty obligations that continue to be due following final acceptance in accordance with Subsection 105-1.16.
618-4.01 METHOD OF M EASUREMENT. See Section 109 and as follows:
Seeding by the Acre. By the area of ground surface acceptably seeded and maintained. Seeding by the Pound. By the weight of dry seed acceptably seeded and maintained. Water for Seeding. If weighed, a conversion factor of 8.34 pounds per gallon will be used to convert weights to gallons. Seeding by the Square Yard. By the area of ground surface acceptably seeded and maintained.
618-5.01 BASIS OF PA YMENT. Mulc hing will be paid for under Section 619. Soil preparation,
fertilizer, and water required for hydraulic method are subsidiary. Seeding by the Acre. Payment is for established vegetative matt. Seeding by the Pound. Payment is for established vegetative mat t. Water for Seeding. Water applied for growth of vegetative matt. Water for hydraulic seeding, fertilizing or mulching is subsidiary. Water after project completion is subsidiary. Seeding by the Square Yard. Payment is for established vegetative matt. Payment will be made under: PAY ITEM Item Number Item Description Unit 618.0001.____ Seeding ACRE 618.0002.____ Seeding LB 618.0003.____ Water for Seeding MGAL 618.0004.____ Seeding SY 618.0005.____ Seeding LS 330 ALASKA 2020 SECTION 619 SOIL STABILIZATION
619-1.01 DESCRIPTION. Furnish, place, and maintain mulch or matting material where shown
on the Plans.
619-2.01 MATERIALS. Use materials that conform to the following:
Mulch Subsection 727- 2.01 Matting Subsection 727- 2.02 Staples Subsection 727- 2.03 CONSTRUCTI ON REQUIREMENTS
619-3.01 SURFACE PRE PARATION. Smooth the surface and backfill all gullies and potholes
before application. Remove all sticks and other foreign material that prevent contact of the mulch or matting and surface. Ensure that the surface is m oist at the time of placement.
619-3.02 APPLICATION . Apply mulch material at the rate specified in the Special Provisions.
If seeding is specified, complete the application of mulch or matting within 24 hours after seed is placed. Staple matting every 5 f eet at joints and edges or as recommended by the manufacturer. Do not use vehicles or equipment which cause rutting or displacement of the subgrade or topsoil.
619-3.03 MAINTENANCE . Reshape and reseed any damaged areas and repair the mulch or
matting as required. Maintain the mulch or matting until all work on the project is complete and accepted.
619-4.01 METHOD OF M EASUREMENT. See Section 109, measured on the slope of the ground
surface.
619-5.01 BASIS OF PA YMENT. Water, maintenance, and repair are subsi diary.
Payment will be made under: PAY ITEM Item Number Item Description Unit 619.0001.____ Mulching SY 619.0002.____ Matting SY
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 355–357 of 584.