If the skew of the end section is greater than 45 degrees, then the S.A. Bridge Office should assist in the plan review. Skews greater than 45 degrees will require shop drawing approval per spec. 3238.2A The note shop drawing approval per spec. 3238.2A is required should be shown with the construction notes on fig. 5-395.101 (A). This note should only be used when our standard precast tables and details have been exceeded or modified. NOTE: the designer can use type I end sections up to a 7.5 degree skew and type III end sections up to a 45 degree skew.
On fig. 5-395.100 (A), under the general notes, we specifically indicate the requirements for the use and construction of the distribution slab. I would recommend the counties/municipalities work with our office in developing the distribution slab plan. The distribution slab only applies to fill heights less than 2 feet; it should be avoided whenever possible. The designer should either consider lowering the culvert inverts, or raising the roadway grade to assure at least 2 feet of cover has been attained.
If a distribution slab is absolutely necessary, then the design should follow the general notes as shown on fig. 5-395.100 (A). The distribution slab plan should show the required quantities for slab reinforcement and slab concrete. Our practice is to include additional pay items for slab reinforcement and concrete. If the designer chooses to make the slab incidental to the culvert, at a minimum the slab/reinforcement quantities should still be shown on the plan for the contractor's reference.