compactor shall be used. Any soft or "spongy" areas shall be removed as directed by the Geotechnical Engineer and replaced with structural fill as described herein.
Foundation, Slab and Pavement Subgrade Preparation
Prior to placing reinforcement, footings, slabs, or pavement, the supporting soils shall be prepared, moisture conditioned, and compacted as described herein.
Fill material shall be nonexpansive soil which may be gravel, sand, silt or clay, or a combination there of.
Fill material shall exhibit a plasticity index of ten or less. No organic, frozen or decomposable material shall be utilized. All fill material shall be approved by the Geotechnical Engineer.
Fill material shall be blended as necessary to produce a homogeneous material. Fill material shall be spread in horizontal lifts no greater than eight inches in uncompacted thickness, but in no case thicker than can be properly compacted with the equipment to be utilized. If fill is to be placed on slopes steeper than 5: 1 (horizontal:vertical) the natural ground shall be benched with minimum three foot wide benches at maximum two foot vertical intervals.