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B-3 Subgrade Pre-caration: Surfaces to receive exigineered fill, building or Slab oads shall be prepared as outlined above, scarified to a depth of six (6) inches, moisture-conditioned as necessary$ and .compacted to 90 per cent relative_.compaction. Loose and/or areas of disturbed soils shall be moisture--conditioned as necessary and compacted to 9D .per cent relative compaction. All ruts$ hummocks, or other uneven surface features shall be removed by surface grading prior to placement of .any fill material. All areas which are to receive fill materials shall be approved by the Soils Engineer prior to the placement of any fill material. EXCAVATION All excavation shall be accomplished to the tolerance normally defined by the Civil Engineer as shown on the project grading plans. All overexcavation below the grades specified shall be backfilled at the Contractor' s expense and shall be compacted in accordance with the applicable technical requirements. FILL AND BACKFILL. MATMIAL No material shall be moved or compacted without the presence of the Soils Engineer. Material from the required site excavation may be utilized for constructing site fills provided prior approval is given by the Soils Engineer. All materials utilized for -con- structing site fills shall be free from vegetal or other deleterious matter as determined by the Soils Engineer. (� PLACEM -,NT, SPREADING AND COMPACTION The placement and spreading of approved fill materials and the processing and compaction of approved fill and native materials shall be the responsibility of the Contractor. However, compac- tion of fill materials by flooding, ponding, or jetting shall not be permitted unless specifically approved by local code as well as the Soils Engineer. Both cut and fill shall be surface compacted to the satisfaction of the Soils Engineer prior to final acceptance. SEASONAL LIMITS No fill material shall be placed, spread, or rolled while it is frozen or thawing or during unfavorable weather conditions. When the work is interrupted by heavy rains, fill operations shall not be resumed until the Soils Engineer indicates that the moisture content and density of previously placed fill are as specified.