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Excavation Stability <br />Excavation depth and sidewall inclination should not exceed those specified in local, state or <br />federal regulations. Excavations may need to be widened and sloped, or temporarily braced, to <br />maintain or develop a safe work environment. Contractors must comply with local, state, and <br />federal safety regulations including current OSHA excavation and trench safety standards. <br />Temporary shoring must be designed in accordance with applicable regulatory requirements. <br />Engineered Fill & Winter Construction <br />The clay and silt-based soils on this site will be susceptible to frost heave action if not provided <br />adequate drainage, insulation or coverage. Frozen soil should not be used as backfill. When the <br />ambient air temperature falls below freezing for an extended period of time, frost forms and soil <br />near the surface grade expands. Settlement of the fill may occur as the frozen soils thaw. <br />If frost penetrates the soil prior to paving, soils must be thawed, scarified, and re-compacted as <br />recommended in this report. Subgrade soils should be inspected prior to paving to verify frozen <br />conditions are not present. <br />6 <br /> <br />