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1. Structural fill shall be used below spread footing foundations, slab -on grade floors, and other structures and as backfill within three feet of the below grade portion of structures. 2. Crusher -run gravel shall be used under and around drainage sumps. It can be used at the request of the Contractor and if approved by the Engineer as base material for areas approved by the Engineer. 3. Limerock base course shall be used under roadways, parking areas, walks and for riprap. Limerock base course may be used by the Contractor at other similar locations if approved by the Engineer or indicated on the Drawings. 4. Common fill shall be used at all other locations. 5. Bedding rock shall be used for pipe bedding, under and around manhole base and at other locations indicated on the Drawings or approved by the Engineer. B. Backfill excavations as promptly as work permits, but not until completion of the following: 1 1. Acceptance by Engineer of construction below finish grade including, where applicable, dampproofing, waterproofing, and perimeter insulation. 2. Inspection, testing, approval, and recording locations of underground utilities. ' 3. Removal of concrete formwork. 4. Removal of shoring and bracing, and backfilling of voids with satisfactory materials. 5. Removal of trash and debris. 6. Permanent or temporary horizontal bracing is in place on horizontally supported walls. Layout and location of bracing shall consider loads of the structure as well as the effects of the soil and groundwater. C. Ground Surface Preparation: Remove vegetation, debris, unsatisfactory ' soil materials, obstructions, and deleterious materials from ground surface prior to placement of fills. Plow strip, or break -up sloped surfaces steeper than 1 vertical to 4 horizontal so that fill material will bond with existing ' surface. 1 07/06 02220 -10 05 -5564