- 663 - SECTION 801 -- PERMANENT SEEDING
801.01 Description
1.Permanent seeding consists of furnishing and placing the seed and fertilizer at locations shown in the contract.
801.02 Material Requirements
1.No seed shall be mixed until t he Engineer provides the Contractor with a seed order list and acres to be seeded.
a.The Contractor shall obtain from the seed dealer, a laboratory analysis of each type and lot of seed proposed for use. The analysis shall be furnished to the Engineer.
b.The analysis shall contain complete information pertaining to the seed as required by State and Federal laws.
c.The Engineer will approve use of the seed if the information on the analysis is satisfactory.
2.The seed shall be mixed, bagged, and tagged at the seed company after the Engineer appr oves the analysis and gives the seed company written authorization to mix the seed for each project. Seed shall be bagged separately when specif ied in the contract.
a.The Engineer will furnish tags to be attached by the supplier to each bag of seed.
b.The Contractor is not allowe d to attach the tags to the bags.
c.The seed shall be delivered to the project with tags attached to the bags. The seed shall not be used unt il the Engineer collects the tags from the bag immediately prior to use.
3.Fertilizer type and quantity sha ll be specified in the contract and shall comply with the applicable requirements of Section 804.
4.Mulch shall be as described in Section 806.
801.03 Construction Methods
1.Seeding methods, rates of applic ation, and seed mixtures shall comply with the contract.
2.Type "B" seeding work shall be performed for a width of up to 16 feet (5 m) adjacent to the edge of the pavement or surfaced shoulder of the roadways and ramps and in the me dian areas. Type "A" seeding work shall be performed on all other areas with in the limits of the project, except areas designated with specialty mixtures.
3.Areas not seeded with cover cr op or that have been slope tracked shall be permanent seeded within seven days, or as directed by the Engineer.
4.Planting Season:
a.Seeding operations shall be performed only during the periods March 1 to June 15 and August 1 to December 1.
b.No seeding operations shall be performed when the ground is frozen, wet or otherwise untillable, or when even distribution of materials cannot be obtained.
801.03 Permanent Seeding
- 664 - 5. Site Preparation:
a.The Contractor shall mow pr ior to permanent seeding. Mowing shall be no higher than 5 inches. The Contractor shall rake and remove the mowing residue before the preparation of the seed bed.
b.The Contractor shall pr epare the seed bed not more than 5 days before sowing the seed by loosening the soil to a depth of not less than 3 inches (75 mm) with a disc, harrow, rake, or by other approved means. Several passes may be required, depending on soil conditions, to provide a satisfactory seedbed. Discing, harrowing, and raking shall be performed parallel to the land contour.
c.Hand work may be required around signs, delineators, guardrail, or other highway appurtenanc es as part of seed bed preparation and is considered subsidiary to the seeding operation.
d.The Engineer may direct that areas of desirable vegetation be preserved. Care shall be exercised to avoid injury to trees and shrubs that have been designated by the Engineer to be preserved.
6.The fertilizer shall be applied prior to seeding and incorporated into the soil in accordance with Section 804.
a.No fertilizer shall be applied wi thin 50 feet of a wetland, lake or stream.
7.Seeding Equipment: a. Seed drills, hydraulic seeders, gravity broadcast seeders, or aerial seeding may be used for planting seed. The contract may indicate the type of seeding equipment to be used on the project.
b.Seed Drills: (1) Seed drills shall be equipped with press wheels or drag chains. The seed delivery system shall space rows no greater than 8 inches apart, shall include a seed box agitat ion system, and shall be capable of metering seed at the rate specified in the contract. Seed shall not be planted greater than 1/2 inch deep.
c.Hydraulic Seeders: (1) Use hydraulic seeding equipment with a pump rated at no less than 100 gallons (350 L) per minute. The equipment shall have suitable working pressure and a nozzle adapted for hydraulic seeding.
2.The supply and/or storage tanks shall have a means of mechanical agitation. The tanks shal l be calibrated, and have a means of measuring the volume used or remaining in the tank.
3.When using a hydraulic seeder, the fertilizer shall be applied separately from the seed.
d.Gravity Broadcast Seeders: (1) In areas inaccessible to field machinery, implement mounted or handheld broadcast seeders may be permitted at the discretion of the Engineer. Permanent Seeding 801.05 - 665 - (2) Gravity broadcast seeder s shall provide agitation of the seed, have a functioning adjustable gate opening, and uniformly distribute seed on the seedbed.
3.Implement mounted broadcast seeders shall be equipped with seed hopper baffle plates.
4.Implement mounted broadcast seeders shall be equipped with a shielded front to prevent the sp reading of material in front of the spreader.
e.Aerial Seeding: (1) When aerial application of seed and fertilizer is specified, aerial equipment shall be capable of providing a uniform distribution of seed and fertilizer on the specified area.
801.04 Method of Measurement
1.The work of seeding will be surface measured by the acre (hectare). The area will be given to the Contractor either before the work begins or during construction. The total area given to the Contractor is the final measurement on which payment is based.
2.The surface measurement will not exclude areas of intersection or driveway surfacing. The Engineer may elect to exclude isolated areas of approximately 10,000 square feet (929 m
2.or less upon which erosion control blankets or netting have been or will be placed.
3.Mulch shall be measured in accordance with Section 806.
801.05 Basis of Payment
1.P a y I t e m P a y U n i t Seeding, Type ______ Acre (A) [Hectare (ha)]
2.Mowing, raking, and removing vegetation growth shall be subsidiary to the seeding item.
3.Fertilizer and its placement are s ubsidiary to the seeding operation.
4.Payment is full compensation for all work described in this Section. - 666 - SECTION 802 -- COVER CROP SEEDING
802.01 Description
1.Cover crop seeding consists of furnishing and applying the appropriate cover crop seed as shown in Table 802.01 and fertilizer as shown below.
2.Cover crop seeding shall be applied in phased construction areas, surcharge areas, other disturbed area s that have not been permanently seeded, or as directed by the Engineer.
802.02 Material Requirements
1.The cover crop seed shall comply with the following requirements and shall be applied at the rates shown in Table 802.01. Table 802.01 Cover Crop Seed Requirements Cover Crop Seed and Limitations Minimum Purity (%) Minimum Germinatio n (%) Approved Broadcast Application Rate Approved Mech. Drill Application Rate Oats: Jan. 1 – Aug 31 80 80 96 lbs/acre (107 Kg/ha) 96 lbs/acre (107 Kg/ha) Foxtail Millet: May 2 – July 15 80 80 25 lbs/acre (27 Kg/ha) 25 lbs/acre (27 Kg/ha) Winter Wheat: Sept. 1 - Dec. 31 80 80 120 lbs/acre (134 Kg/ha) 120 lbs/acre (134 Kg/ha) Annual Ryegrass Urban Areas: Jan. 1 - Dec. 31 80 80 50 lbs./acre (55 Kg/ha) 50 lbs./acre (55 Kg/ha)
2.The seed for cover crop shall be delivered in bags and tagged with the purity and germination shown on the tag. Bulk seed may be used. Bulk seed shall have a current purity and germination test.
3.Fertilizer shall be required for cover crop seeding. Rate of application of commercial inor ganic fertilizer shall be: R a t e o f A p p l i c a t i o n Available Nitrogen (N2) 60 lbs/Acre
802.03 Construction Methods
1.The work of cover crop seeding shall be started within 24 hours and completed within seven calendar days following the finish grading operation.
b.The Engineer may designate other areas that are to be cover crop seeded earlier than shown above.
2.Preparation: a. The Contractor shall prepar e the seed bed to a minimum of 1-1/2 inch (38 mm) of loos e soil. This requirement is dependent upon soil type and may be altered at the directio n of the Engineer so that a lesser thickness of loose earth may be acceptable. 3. Seeding: a. The Contractor shall apply the seed at the rate shown in Table 802.01.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 697–699 of 1,048.