02.A02_Scope_of_Work_AOP_Purchase_06.29.2018.docx

Scope of Work Provide an aluminum bottomless arch or box culvert 12 feet wide by 40 feet long by 4 feet high with footers and any hardware necessary for installation. The culvert shall support a HS20 live load, shell A6, and a maximum 1.5 foot cover. Provide plate layout drawings.

Footers should be a solid 40 foot precast foundation with 2000 PSF bearing Capacity, 3’ thick x 3’-6” wide reinforced concrete footings [Each Footing in 2 pieces] connection plates and hardware included. The footings shall contain lifting lugs per manufacturer recommendations, and the channel dimensions shall be 5” bottom x 5” deep x 5 ½” top.

The cement used shall be Type II, but may use Type V if no cost difference. The concrete shall be Class C (AE), with a maximum w/c ratio of 0.45, a minimum compressive strength of 4.5k psi (28 days), and be entrained with air. A minimum of 5.5% and maximum of 8.5% air content is required. The minimum air content values may be reduced by up to 1% for concrete with f’c greater than 5k psi.

The acceptable coarse aggregate size numbers are 7 and 78, and shall meet the requirements of AASHTO M 43, Table 1-Standard Sizes of Processed Aggregate.

Cementitious Material Requirements for Concrete shall conform to the requirements of FP-14 Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects, Table 552-3.

Coordinating with the COR (with at least one week notice) so that Forest Service personnel are available to lead you to the site and show the exact delivery location, deliver all materials to a location to be determined adjacent to Carnero Guard Station as shown on the map below. The Contractor shall provide all equipment necessary to unload all materials, including the culvert, at the site.

The Carnero Guard Station is located on the Rio Grande National Forest approximately 41 miles northwest of Monte Vista and 28 miles southwest of Saguache just off National Forest Service Road 41G.

NFSR 41G

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