A precast concrete catch basin has an overall typical width of 4 feet 0 inches and 5-inch side walls. The top and bottom slabs feature 8-inch thicknesses with internal corbel details supporting variable riser heights. A base height varying with a 2-foot 8-inch minimum is specified, including a 14-inch wide lower opening and a 22-inch diameter upper opening located 24 inches above the base. Dimensions are provided for all wall thicknesses, clearances, and structural section offsets.
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