FSSS619_cattleguard_Spec.doc

Section 619 _Fences, Gates and Cattleguards 619_ R04F12__2-12-2010

619.01 Add the folllowing:

This work consists of supplying precast concrete footings and cattle guard grates as made by AMCOR Precast, for three cattleguard installations on the Goose Lake Road. This Supplemental Specification modifies the FP-03 Standard Specifications for Constrcution of Roads and Bridges on Federal Highway Projects, which is available on line at : http://flh.fhwa.dot.gov/resources/pse/specs/

619.07 Cattle Guards

Delete (a) excavating and backfilling.

Add the following: The cattleguard grate and precast footing shall be delivered to the McCall yard on 1000 North Mission Street before June 1, 2010. Offload the grates and footings with machinery provided by the contractor.

(b) Concrete foundation:

Delete the entire section.

Add the following:

The concrete footing shall be precast units constructed according to 601- Minor Concrete Structures. The casting plant shall be NPCA certified ( National Precast Concrete Association). The concrete footings shall be vault type and the footings shall support the cattleguard grate so that the cattleguard grate fits tightly without rocking. The cattleguard grate shall rest on neoprene pads.

The concrete footing and the cattle guard grate shall be as manufactured by AMCOR Precast (the Nampa plant contact is Mike Blackham at 208 465-0176), or approved equal.

Submit shop drawings of the concrete bases and cattle guard grate to the Contracting Officer for approval at least two weeks prior to fabrication. Prepare and submit drawings according to Subsection 104.03. The concrete footings and the cattle guard grate shall be designed and construted to support AASHTO HS-20-44 loading. Acceptance of the drawings covers the requirements for strength and detail only. No responsibility is assumed for errors in dimensions.

The weight of each section of concrete footing with cattleguard grate shall not exceed 8,700 pounds.

(c) Cattle guard Grate Delete the entire section.

Add the following:

Fabricate cattleguard grate according to Section 555. Welding to fabricate the grates shall be according to ANSIA/ AASHTO/ AWS D1.5.

Deliver the units with the cattleguard grate placed on the precast footing, and demonstrate to the Contracting Officer that the grate fits tightly without rocking.

(d) Painting Paint all exposed steel with one coat of shop paint, and two additional coats of paint. Final color shall be a green color, approved by the Contracting Officer.