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Grading typical G_2_GradeGran shows the cross section used for granular surfacing on county roads, median crossovers, and commercial residential, farm, and field entrances. Follow the guidelines below for calculating quantities:
Granular surfacing placed as stage construction.
Stage 1 surfacing is done as part of the grading project. The normal design rate of application is 48 tons per station on county roads and entrances (based on a 3 inch thick layer of Class A crushed stone).
Stage 2 surfacing is normally done with the paving project. The normal design rate of application is 16 tons per station on county roads and entrances (based on a 1 inch thick layer of Class A crushed stone).
For grade-pave projects in which the surfacing cannot be placed in stages, the design rate of application is 48 tons per station on county roads and entrances. This is based on a 3 inch thick layer of Class A crushed stone.