- 671 - SECTION 805 -- SOIL AMENDMENT
805.01 Description
1.This work consists of furnishing and placing soil amendment on areas shown in the contract or as directed by the Engineer.
805.02 Material Requirements
1.Soil Amendment will be specified in the contract and selected from the Department’s Approved Products List.
2.The soil amendment shall be delivered to the site in packaging that clearly identifies the manufacturer, ty pe of soil amendment and weight per bag.
3.The Contractor shall provide t he necessary water required for the operation of applying the soil amendment.
805.03 Construction Methods
1.The Contractor shall apply the soil amendment within 24 hours after planting the seed or as directed by the Engineer. The soil amendment shall be applied uniformly over prepared areas with a hydromulch machine or other equipment necessary to uniformly apply the product as described in Section 801.03.
2.Prior to the application of th e Soil Amendment, drill one-half of the seed required per acre over an acre. The other one-half of the seed required per acre shall be incorporated into the soil amendment slurry and applied to the site.
3.Application Rates: a. Soil Amendment shall be applied at 2 tons per acre.
b.The required tons of so il amendment will be determined by multiplying 2 tons per acre by the acres of application.
c.The Engineer may direct the Contractor, in writing, to adjust the application rate resulting in an in crease or decrease of the required tons of soil amendment.
4.The Contractor shall refer to the manufacturer’s recommendations for appropriate product to water ratios.
5.The soil amendment shall be a pplied in a manner that ensures complete and uniform coverage. The Contractor shall apply the soil amendment from opposing directions or as directed by the Engineer.
805.04 Method of Measurement
1.Soil Amendment is measured by the ton.
2.The weight of Soil Amendment applied will be computed on the basis of the weight per bag multip lied by the number of bags used.
805.05 Basis of Payment
1.P a y I t e m P a y U n i t Soil Amendment Ton
805.05 Soil Amendment
- 672 - 2. Final Quanti ty Determination:
a.If the computed tons of t he soil amendment applied are within 5% (+/-) of the tons required as dete rmined by the approved application rate, the final pay quantity will be the computed weight.
b.If the computed tons of the soil amendment applied are less than 95% of the tons required as det ermined by the approved application rate, the Contractor shall apply additional soil amendment at locations as directed by the Engineer. The final pay quantity will be the computed weight after the additional application has been applied and will not exceed 105% of the tons required as determined by the approved application rate.
c.If the computed quantity of the soil amendment applied exceeds 105% of the tons required as determined by the approved application rate, the final pay quantity will not exceed 105% of the tons required as determined by the approved application rate.
d.If upon visual inspection, the Engineer determines that the soil amendment application is “light” in some areas, even though the required tons as determined by the approved application rate was applied to the overall area of applicat ion, the Contractor shall apply additional soil amendment as directed by the Engineer. The final pay quantity will be the computed weight after the additional application has been applied and will not exceed 105% of the tons requir ed as determined by the approved application rate. The quantity of soil amen dment applied that is in excess of 105% of the tons required as determi ned by the approved application rate shall be at no additional cost to the Department.
3.Direct payment for water incorporated into the soil amendment will not be made. Water is subsidiary to the item of soil amendment.
4.Payment is full compensation for all work described in this Section. - 673 - SECTION 806 -- MULCHING
806.01 Description
1.This work consists of provid ing, placing, and securing mulch on areas shown in the contract or identif ied by the Engineer as being seeded in accordance with Section 801.
806.02 Material Requirements
1.Mulch shall be either dry cured native prairie hay, native grass hay from seed growing operations, native grass hay from planted warm season grass stands, or straw. Brome hay, rushes, cattails, Reed Canary Grass, wide-bladed grass or invasive species are not allowed.
2.Hay or straw in a stage of decomposition so advanced as to "powder" in the mulch blower will be rejected.
3.The Contractor shall notify the Engineer as to where he/she proposes to obtain the hay.
4.Straw shall be from threshed oats, wheat, or rye. Rye straw shall not be used in any wheat growing area. The straw shall be baled before the seasonal growth of annual weeds.
5.Certification and Scale Tickets:
a.The mulch shall be certifie d as "Noxious Weed Free" by the "County Weed Control Authority" or other authorized agents.
b.Scale Tickets:
1.All mulch deliveries shall have scale tickets from a certified scale.
2.The Contractor shall give the Engineer a scale ticket for each load of mulch delivered to the site before the mulch is unloaded for use on the project. The scale tickets shall indicate the weight and be dated and signed by the scale operator.
3.The Engineer may, at any time, order the Contractor to reweigh the mulch as a check of the scale ticket.
c.The copy of the “Noxious Weed Free” certification and the scale ticket shall accompany each load of mulch.
1.Upon delivery to the site, a copy of the certification shall be placed in a weather-proof container a nd attached to the load of mulch it represents.
2.Prior to incorporation of the mulch, the Engineer will collect the copy of the ce rtification from the load.
806.03 Construction Methods
1.The Contractor shall apply th e mulch within 24 hours after planting the seed, unless otherwise directed by the Engineer. The mulch shall be applied uniformly over tilled areas with a mulch blowing machine.
2.Application Rates: a. Hay mulch shall be appli ed at the rate of 2 tons/acre (4.5 Mg/ha) when used in conjunction with the permanent seed mixture.
b.Straw mulch shall be applied at 2.25 tons/acre (5 Mg/ha) when used in conjunction with the permanent seed mixture.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 705–706 of 1,048.