- 677 - SECTION 808 -- SLOPE PROTECTION
808.01 Description
1.This work shall consist of plac ing seed and a protective covering of mulch upon the completed shoulders, sideslopes, ditch bottoms, or backslopes as shown in the contract or as directed by the Engineer.
808.02 Material Requirements
1.The mulch being used for slope protection shall be as described in 806.02, except that straw will not be allowed.
2.The Material Requirements for Slope Protection seeding shall be as described in Subsection 801.02.
808.03 Construction Methods
1.The Contractor shall commence slope protection work within five calendar days after the finish grad ing operations have started.
2.The work on the project may be temporarily suspended for failure to initiate the finish grading and/ or slope protection operation.
3.Seeding: a. The initial seeding shall be dr illed at the rate specified in the contract.
b.The remainder of the seed sh all be broadcast over the mulch.
c.All seed may be broadcast if conditions preclude drilling, such as steep slopes or unsafe conditions.
4.Mulching: a. The Contractor shall pl ace mulch for the slope protection uniformly at 2 lbs/Sq Yd (1.1 Kg/m 2).
b.Mulch may be applied either by hand or mechanically.
c.A machine that chops a bale apart shall not be used. d. The Contractor shall place pi les of soil on the mulch to hold it in place. The soil piles shall be placed at intervals of not more than 40 inches (1 m) in any direction over the surface of the area mulched. The piles of soil shall be of sufficient size to hold the mulch in place. The sources from which the Contractor obtains the so il shall be approved by the Engineer and shall be left in a condition which is satisfactory to the Engineer.
e.In lieu of securing the mulch with piles of soil, the Contractor may use a mechanical device to anchor the mulch. The mechanical device shall either be a drum roller with cleats or a crawler tractor with cleated tracks.
1.The cleats on both the roller and the crawler tractor shall punch the mulch approximately 6 inches (150 mm) into the soil.
2.Either device shall have sufficient cleats to anchor all of the mulch.
3.Shoulders shall average ten cleat punches per square yard (12 cleat punches per m 2).
4.Areas other than shoulders shall average four cleat punches per square yard (five cleat punches per m2).
808.03 Slope Protection
- 678 - (5) More than one pass may be required to obtain the necessary rate of cleat punches to secure the mulch.
6.The equipment shall not be operated perpendicular to any slope if such action will promote soil erosion.
5.Mulching Steep Areas:
a.Areas that are too ste ep for machine methods shall be performed by hand methods.
b.Steep areas are defined as slopes on which the mechanical devices being utilized would signific antly disturb the finish grade.
808.04 Method of Measurement
1.The slope protection quantity m easured is the number of square yards (square meters) of surface area seeded, mulched and anchored.
2.The measured area of the slope protection will be provided to the Contractor. The total area given to the Contractor is the final measurement.
3.Slope protection mulch is measured as described in Subsection 806.04.
808.05 Basis of Payment
1.P a y I t e m P a y U n i t Slope Protection Square Yard (SY) [Square Meter (m2)] Slope Protection Mulch Ton (Tn) [Megagram (Mg)] 2. Payment is full compensation for all work described in this Section. - 679 - SECTION 809 -- SODDING
809.01 Description
1.This work consists of furnishi ng, fertilizing, watering, and placing bluegrass sod in accordance with the contract.
809.02 Material Requirements
1.The sod shall be grown at a sod farm, licensed by the Department of Agriculture. A certific ation of origin shall accompany each load delivered to the project site.
2.The sod shall have been grown from more than one variety of bluegrass seed, grown specifically fo r the production of bluegrass sod, and maintained by accepted sod production methods.
3.Cutting: a. Prior to harvesting, the sod shall be mowed uniformly at a height of 1 to 2.5 in ches (25 to 60 mm).
b.The sod shall be machine cut at a uniform soil thickness of 0.60 inch (15 mm), plus or minus 0.25 in ch (6 mm), at the time of cutting. Measurement for thickness shall exclude top growth and thatch.
c.All sod shall be free from all weeds. d. Individual pieces of sod s hall be cut to the supplier’s standard width and length. Broken pads and those with torn or uneven ends will not be accepted.
e.The sod shall not have dry or dead edges.
4.Fertilizer: a. The composition and rate of application of fertilizer shall be a minimum of 8 lbs of available Nitrogen (N
2.and 23 lbs of available Phosphoric Acid (P 2O5) per 1000 square yards.
5.The acceptable pre-emergent w eed control chemicals and their rate of application shall be as shown in the table below. Acceptable Pre-emergent herbicides shall be: Chemical Name Trade Names Rate of Application Pendimethalin Pendulum Midrange of manufacturer’s suggested range Prodiamine Barricade Midrange of manufacturer’s suggested range Dithiopyr Dimension Midrange of manufacturer’s suggested range Siduron Tupersan Midrange of manufacturer’s suggested range Other Any other approved and equal weed control chemicals may be used.
809.03 Construction Methods
1.The area to be sodded will be show n in the contract or as directed by the Engineer.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 711–712 of 1,048.