Pipe class minimum — shallow cover omission
The RFP specifies Class III RCP as the minimum pipe class for diameters 24″ and under. Applicable §SD-401 requires Class IV pipe wherever cover depth is less than 3 ft. Profile sheets show cover depths of 2.1 to 2.8 ft at sta. 14+50 through 18+20 — Class IV would govern at those locations.