100	SCOPE OF WORK: This project consists of building a new 3-span prestressed concrete box beam bridge with an overall bridge length of 242'-0" and a clear roadway width of 32'-0".

100	GENERAL: Include the cost of furnishing and placing preformed expansion joint filler, concrete inserts, rebar couplers, silicone sealant, waterproof membrane, and other miscellaneous items in the price bid for Class AE-3 and AAE-3 concrete.

107	HAZARDOUS MATERIAL: The existing structural steel is painted with lead-based paint. Remove and dispose of any loose and peeling paint found on the existing structural steel according to the North Dakota Department of Health’s management of lead-based paint debris.

202	REMOVAL OF STRUCTURE: The existing structure is a 3-span steel girder bridge, 140'-0" long with a clear roadway width of 24'-0". The substructures are made of concrete. Remove existing substructures to 1 foot below final rip rap bottom. Include all work required to remove the bridge in the contract unit price for “Removal of Structure – Site 3.”

The substructures are made of concrete and are supported on steel piling, except for the two interior piers which are supported on timber piling. Remove existing substructures to 1 foot below final rip rap bottom. Portions of the original abutment from 1959 may remain in place and should also be removed to 1 foot below the final rip rap elevation.

210	EXCAVATION: The estimated quantity of channel excavation is 4,000 CY. Include the

excavation costs for shaping the channel bottom and end slopes in the lump sum bid

item, “Foundation Preparation-Site 3.” Include the excavation costs at the abutments and

approach slab footings, as shown in the “Detail at Abutment”, in the lump sum bid item,

“Class 1 Excavation – Site 3.” Include the excavation costs at the piers in the lump sum bid item,

“Class 2 Excavation – Site 3.”

602	DIAPHRAGMS AND ENDWALLS: Place the pier diaphragm and endwall concrete at the same time as the deck concrete.

602	WEATHER LIMITATIONS: All requests in accordance with 602.04 C.4 “Weather Limitations” require approval from the NDDOT Bridge Division.

602	DECK PLACEMENT: Place the deck concrete at a minimum rate of 40 CY per hour.

602	BRIDGE DECK AND APPROACH SLAB CURING: Do not cover the wet cure burlap with a waterproof material such as polyethylene during the curing period.

602 BRIDGE DECK AND APPROACH SLAB CRACK SEALING: After the penetrating water repellent has been applied and is dry, the Engineer will perform a visual inspection of the bridge deck and approach slabs to determine the need for crack sealing. Repair all cracks designated by the Engineer at this time.

Perform a visual inspection of the bridge deck surface and mark all visible cracks
appearing on the top surface 0.007" or greater in width at its widest segment or as
directed by the Engineer.

Immediately before applying the sealer, clean the cracks by removing all dust and debris
with compressed air. Seal the cracks with a two-part epoxy in accordance with the
manufacturer’s recommendations. Chase crack with the sealant application to limits of
crack, including those portions that are narrower than 0.007" wide. The epoxy sealer
may be Paulco TE-2501 (Viking Paints, Inc.), Dural 50 LM (Euclid Chemical Co.), TK-
9000 or TK-2110 (TK Products), or an approved equal. Include all work and materials
associated with the deck and approach slab crack sealing in the price bid for the Class AAE-3 Concrete and Approach Slab bid items.

602	FORM LINERS: Include the cost to provide and install the form liners in the price bid for the appropriate concrete items.

602	SURFACE FINISH “D”: Apply Surface Finish “D” on the exposed abutment surfaces, the fascia surface of the exterior beams, the outside edges of the pier diaphragm, the outside edges of the deck, the exposed endwall areas outside of the exterior beams, and to all bridge and approach slab barrier surfaces except for the recessed form liner areas. Use gray surface finish, color number 36424 meeting Aerospace Material Specification (AMS) Standard 595, for the inside and top surfaces of the bridge and approach slab barriers. Match the color of the lightest brown used in the Architectural Surface Finish for all other surfaces. Submit to the Engineer a 1' x 1' sample of the tan surface finish.

604	PRESTRESSED BEAMS: Set prestressed beams on bearing seats without field bending substructure or beam reinforcing steel.

616	STRUCTURAL STEEL: Approximately 1,500 lbs of structural steel has been estimated for the ice noses. Include all costs to provide and install the ice noses in the price bid for “Structural Steel.” Shop drawings for ice nose structural steel are not required.

622	PILING: Drive approach slabs piling with a diesel hammer with with an operational hammer energy and ram weight (minimum of 3,000 pounds) of at least 35,000 foot-pound-tons computed by the formula:

W(E–12,936) + 0.515E

Drive pier piling with a diesel hammer with an operational hammer energy and ram weight (minimum of 6,000 pounds) of at least 60,000 foot-pound-tons computed by the formula:

W(E–22,176) + 0.492E

Drive abutment pile with a diesel hammer with an operational hammer energy and ram weight (minimum of 4,000 pounds) of at least 48,000 foot-pound-tons computed by the formula:

W(E–16,000) + 0.598E

W = Weight of the ram (tons)

E = Rated hammer energy

Run the hammers at an energy that produces a penetration at bearing between ½ inch and 3 inches in the last 10 blows.

Stop pile driving operations if bearing is not yet obtained at a depth approximately 10 feet beyond the estimated depth. Wait 24 hours to allow pile setup to occur. After 24 hours warm the hammer with a minimum of 20 blows by striking the ground or timber mats. Restrike the pile with 10 blows to determine if bearing has been achieved. If bearing was not achieved during restrike, continue to drive the pile until bearing is achieved.

900	ELEVATION CHECK POINTS: Place eight bolts on the top of the barriers, in accordance with Std D-900-1, to serve as elevation check points. Include the cost for this item in the unit price bid for Class AAE-3 concrete.