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AET #20-02044 - Page 15 <br /> <br />outfall areas or storm utilities. Where sand fill is to be placed over clays near the surface, we <br />recommend sloping or shaping the clays towards areas where they can drain. <br /> <br />Exterior Site Drainage <br /> <br />Because infiltration of ground water into the subgrade soils can result in increased frost heaving <br />problems and weakening of subgrade soils in both pavement and sidewalk areas, proper site <br />drainage is important. The pavements, sidewalks and exterior slabs should be properly sloped and <br />maintained to allow runoff of surface water. <br /> <br />CONSTRUCTION CONSIDERATIONS <br /> <br />Potential Difficulties <br /> <br />Many of the site soils are susceptible to disturbance by the action of construction equipment. If <br />these soils become disturbed during excavating, they should be subcut to underlying undisturbed <br />soils. Use of backhoe excavating equipment, especially in Iow areas should reduce the potential <br />for disturbance. <br /> <br />Some of the site soils may be wet, and may require scarification and drying to allow compaction <br />to specified levels. <br /> <br />Excavation Sidesloping <br /> <br />We recommend that unretained trench excavation sideslopes meet requirements established in <br />OSHA Regulations (Standards-29 CFR), Part 1926, Subpart P, "Excavations." The contractor <br />should be responsible for trench safe~. <br /> <br /> <br />