- 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. Cover Crop Seeding 802.05 - 667 - b. The cover crop seed shall be drilled.
1.The cover crop seed may be broadcast and harrowed in areas inaccessible by drilling equipment.
i.If the seed is broadcast, a light harrowing shall be required to incorporate the seed into the soil. (ii) The harrow may be attached to the broadcast seeder. c. If the cover crop fails to sprout, develop a root system and produce vigorous growth, reseeding shall be required and shall be performed at the cont ractor’s expense.
d.The seeding equipment shall be calibrated in accordance with the manufacturer's recommended procedures.
5.Mulching:
a.When soil and weather conditions exist that it is anticipated that the cover crop seed will not germinate within 10 calendar days, the Engineer will direct that Temporary Mu lch shall be applied in accordance with Section 806.
6.The fertilizer shall be applied prior to seeding and incorporated into the soil.
a.No fertilizer shall be used with in 50 feet of a wetland, lake or stream.
802.04 Method of Measurement
1.Cover crop seeding is measured by the acre of ground surface seeded. The areas will be calculated from surface measurements of the length and width.
2.Mulching directed by the Engineer will be measured as Temporary Mulch in accordance with Section 806.
802.05 Basis of Payment
1.P a y I t e m P a y U n i t Cover Crop Seeding Acre (A) [Hectare (ha)]
2.The quantity shown in the c ontract includes the necessary additional cover crop seeding due to antic ipated phased construction in the contract.
a.Certain areas may require cover crop seeding more than once, either because the Contractor dist urbs the area as a consequence of contract phasing or as directed by the Engineer.
1.If the re-seeding is a result of disturbance as directed by the Engineer or contract phasing, it will be paid for by the Department.
2.If the cover crop is disturbed through the Contractor's action contrary to contract requirement s, the Contractor shall re-seed the disturbed cover crop at no additional cost to the Department.
3.Mulching directed by the Engineer will be paid for as Temporary Mulch as described in Section 806.
4.Payment is full compensation for all work described in this Section. - 668 - SECTION 803 -- TEMPORARY SEEDING
803.01 Description
1.Temporary seeding consists of furnishing and applying the appropriate seed as shown in Table 803.01, fertilizer as shown below and hydromulch.
2.Temporary seeding can be used on embankments or cuts that are temporary in nature, stockp iles of soil, and other places that require soil stabilization. These areas may be shown in the contract or as directed by the Engineer.
803.02 Material Requirements
1.The seed shall comply with the following requirements and shall be applied at the rates shown in Table 803.01. Table 803.01 Temporary Seed and Limitations Minimum Purity (%) Minimum Germination (%) Approved Broadcast Application Rate Oats: Jan. 1 - Aug. 31 80 80 96 lbs/acre (107 Kg/ha) Foxtail Millet: May 2 - July 15 80 80 25 lbs/acre (27 Kg/ha) Winter Wheat: Sept. 1 - Dec. 31 80 80 120 lbs/acre (134 Kg/ha) Annual Ryegrass Urban Areas: Jan. 1 - Dec. 31 80 80 50 lbs./acre (55 Kg/ha)
2.The seed for temporary seeding 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 cu rrent purity and germination test.
3.Fertilizer shall be required for temporary seeding. Rate of application of commercial 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 4. The hydromulch shall be select ed from the Depart ment’s Approved Products List categories Type HM2 or HM3.
803.03 Construction Methods
1.The work of temporary seeding shall be started within 24 hours and completed within seven calendar days following earth moving activities.
b.The Engineer may designat e other areas that are to be temporary 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.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 700–701 of 1,048.