Tons and Tons of Rocks

My husband tells me that almost all of the large rocks in the vineyard alley have been removed. We have 35 alleys so I attempted to do the calculation. We used a dump trailer that was approximately 7 feet long by 2 feet high by 4 feet wide for 56 cubic feet or approximately 2 cubic yards.

For a rock size of R-6, which is approximately 24 inches, there are 1.4 tons per cubic yard. Since there is considerable void volume and the tonnage varied from truck load to truck load, I've taken the average to be approximately 1.7 tons per truck load which comes out to 59.5 tons of rocks! It boggles my mind!