The answer will depend on the depth of the soil cover.
48x32 what and to what depth.
You would need 3,355 cubic yards of soil to cover 6 acres at 24 inches deep.
one ton equals one cubic meter of soil was 100mm deep it would cover 7sqm
You would need about 1 cubic yard of topsoil to cover a 200 square foot area with 1 inch of soil.
The answer depends on the thickness of the covering layer. That, in turn will depend on what the soil is for: lawn will require less depth than flower beds.
enough to cover it
there is sand
3600 / 12 = 300 tons
easy, a bunnings warehouse soil cover.
More information is needed. It all depends on weither or not the soil is wet, how fine the soil is, and whats in the soil.
Soil cover earth's land surfaces
To cover that area to that depth - you would need just under 8 cubic yards of soil.