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One cubic yard covers 81 square feet 4 inches thick.
There are 76 inches in 2 yards and 4 inches.
At a poured depth of 4 inches, you will need 4.94 cubic yards.
1500 sq ft * 4 inches = 1500/9 sq yards * 1/9 yards = 18.518518... cubic yards.
That is 2 yds x 2yds, so 4 square yards. Or, 72 x 72 = 5,184 square inches; there are 1,296 square inches in one square yard (36 x 36), so 5,184/1,296 = 4