331 ALASKA 2020 SECTION 620
620-1.01 DESCRIPTION . Furnish and spread topsoil where shown on the Plans.
620-2.01 MATERIALS. Use materials that conform to the following:
Topsoil Section 726
620-3.01 PLACING. Spread the topsoil evenly on the designated areas to the depth (after
settlement) shown on the Plans. Do not place when the ground or topsoil is frozen, excessively wet, or in a condition detrimental to the work. Keep the roadway surfaces clean of topsoil during hauling and spreading operations.
620-3.02 MAINTENANCE AND REPAIR. Maintain the areas covered by topsoil until subsequent
seeding or landscaping is accomplished. Complete any repairs or topsoil replacement, including damage or loss resulting from winter shutdown, without extra compensation.
620-4.01 METHOD OF M EASUREMENT. See Section 109, measured on the slope of the ground
surface.
620-5.01 BASIS OF PA YMENT. Stockpilin g and rehandling of topsoil during the stripping
operations or during placement are subsidiary. Topsoil repair, maintenance, and replacement are subsidiary. Payment will be made under: PAY ITEM Item Number Item Description Unit 620.0001.____ Topsoil SY 620.0002.____ Topsoil CY 620.0003.____ Topsoil LS 332 ALASKA 2020 SECTION 621 PLANTING TREES AND S HRUBS
621-1.01 DESCRIPTION . Furnish, plant or transplant, and maintain trees, shrubs, and other
plants on prepared areas in conformance with the Plans. MATERIALS
621-2.01 PLANT STOCK. Furnish plants that are true to type and name according to the current
edition of Standardized Plant Names , American Joint Committee on Horticultural Nomenclature. Furnish plants and plant bundles labeled with durable and legible labels according to size, botanical genus, and common plant name. Furnish the variety and species specified in the Special Provisions. Furnish plants that are typical of the species or variety and that conform to American Standard for Nursery Stock (ANSI Z60.1) for type and grade. Furnish nursery grown plants unless collected plants are specified. Furnish plants that are grown or conditioned to an environment similar to the project site, including elevation, annual precipitation, soil conditions, and climate. Fu rnish plants free from disease, injurious insects, mechanical wounds, broken branches, decay, or other defects.
1.Nursery Stock.
a.Furnish trees and shrubs furnished from a nursery that have been root pruned during their growing period in the nursery accordi ng to standard nursery practice to produce a fibrous compact root system suitable for the various species and sizes called for on the Plans. Use nursery stock that has been growing for at least 2 full growing seasons.
b.Furnish container grown plants that have been growing for at least 1 year but no more than 2 years in the same container. Only ground cover plants may exhibit a “pot -bound” condition.
c.Provide trees with straight trunks, well -branched with symmetrical tops and no unhealed scars more than ¾ inch in diameter.
2.Collected Stock. Collect healthy plants growing under natural conditions in soils and in locations which lend themselves to proper collecting practices. Ensure that the root systems or balls for collected stock is at least 25 percent larger t han those specified for nursery -grown material.
3.Balled and Burlapped Plants.
a.Meet the ball diameters and depths specified in the American Standard for Nursery Stock (ANSI Z60.1).
b.Furnish plants with a firm ball of earth from the original and undisturbed so il in which the plant was growing. Wrap the ball with burlap or similar approved material and lace it tightly to hold the ball firm and intact. Plant material that arrives at the planting site with broken or loose balls or with manufactured earth, are unac ceptable. Handle balled and burlapped plants by the earth ball only and protect against drying and freezing.
4.Substitutions . No substitutions are permitted without written approval. Notify the Engineer in writing within 6 weeks of target planting date if any specified plant is not obtainable or available. The Engineer will evaluate the plant availability and may consider allowing the nearest available size and similar variety, with corresponding adjustment to the contract unit price.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 359–359 of 584.