(A) No fills shall be made without first removing the sod or other material which will not readily compact. The on-site material, except for the organic material, can be used as compacted fill unless specifically rejected by the engineer.
(B) The selected fill materials shall be placed in uniform layers of nine to 12 inches of loose material. Each layer must be approved by the engineer prior to placement of the next layer.
(C) Moisture and density control will be exercised. All subgrade under pavement will be compacted with equipment approved by the engineer to 95% of maximum density according to ASTM Specification D-698 “Standard Proctor Density” while all other material is to be compacted to 90% of the maximum density. If the natural moisture of the fill material is in excess of the specified moisture range, each layer will be disced and dried until the moisture content falls within the specified moisture range. If the natural moisture content of the fill material falls below the specified moisture range, additional moisture must be added to bring it to the specified range.