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Stone is approximated at about 2700 lbs. per cu. yd.
An acre is 43560 sq. ft.
8.5 acres is 370260 sq. ft.
There 9 sq.ft. per sq. yd., thus there are 41140 sq. yds. in 8.5 acres.
A cubic yard is 3 feet by 3 feet by 3 feet (LxWxH).
Since you are only going to be at 1.5 feet, each square yard is equal to 1/2 cubic yard, so to figure the cubic yards divide sq.yds. by 2, thus you get 20570 cu. yds. of stone.
20570 x 2700 = 55539000 pounds. Divide by 2000 to get tons:
55539000/2000 = 27769.5 tons.
1 cubic yard is 3ft by 3 ft by 3 ft.
3 times 3 times 3 equals 27, so
1 cubic yard equals 27 cubic feet.
2 1/2 inches divided by 12 inches equals .2083333 feet
196 square feet times .208333 feet equals 40.83333 cubic feet
40.83333 cubic ft divided by 27 cubic ft equals 1.5123456 cu yards.