We have a site that has required the contractor to strip and stockpile the top foot of soil after clearing and grubbing has been completed. This topsoil was to be saved for re-use as topsoil after subgrading operations were completed. After subgrading was completed the contractor placed the topsoil from the stockpile into the landscaped area at the same depth of 1 foot with a required compaction of between 85% and 90%. The area of stripping vs the area of placing topsoil is the same. However there was a need to import a significant amount of topsoil. (like half of the stockpile) within the same amount of area. I have heard of shrinkage from bank volume to compacted place yards but not that high. The soil type is a clay loam. Does anyone have shrinkage factors for this type of situation. I have gone through almost 30 pages of interesting threads regarding shrinkage and cut and fill calcs but they don't speicifically deal with soley topsoil and the fact the compaction requirements of topsoil placement is less. We figured about 20% shrinkage which seems to be reasonable. Thank You DHF
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