• Structural steel conforms to ASTM a-36 specifications
• Design and workmanship per current area specifications for steel railroad bridges
• Welding procedures are arc process per current AWD code dI.1.
• Concrete material mixing, placing and curing per area specifications for concrete and
  Reinforced concrete railroad bridges and other structures.
• Compressive strength is equal to 2,000 psi before panel is removed from forms
• Compressive strength is equal to 5,000 psi at twenty-one(21) days
• Minimum cement content is equal to seven (7) sacks per cubic yard
• Maximum water/cement ratio is equal to 0.47(by weight)
• Slump not to exceed three inches
• Air entrainment percent is equal to 5.5 % with a variance of +/- 1.0%
• Reinforcing steel to be per current ASTM a-61 5 specifications and meet grade 60
  Requirements
• Driving surface will have a light broom finish. Water is not permitted on the panel During finishing.

The crossing site should be inspected prior to commencement of the plank installation to determine if proper drainage and sub-surface support have been provided. If conditions warrant, the site is to be over-excavated and crossing drainage system installed using compacted, high grade granular fill with a sub-ballast, geo-textile fabric and perforated drainage pipe.

Track grade through the crossing must be uniformed. Adze and treat ties as necessary in order to provide an absolute level surface. Tie spacing must be accurate enough to support the crossing panels on the centerline of the tie.

Precast panels are to be handled and supported only by the specific lifting devices, and at the designated lifting locations on the crossing plank. Lifting equipment and connection devices are to be properly sized to handle the length and the weight of the concrete panel being installed. Rubber flange filler is strongly suggested to fill the field and gauge flangeways.

Approach asphalt paving is to be compacted in maximum three inch lifts and parallel to the crossing the minimize approach settlements.