2003-10-14_REVISION - M1992069 (3)

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Geotechnical Engineering Report Eagleview Drainage Channel Southwest of "F" Street and 35~h Avenue Terracon Project No. 21035051 Terracon workability may be improved by scarifying and drying. Overexcavation of-wet zones and replacement with granular materials may be necessary. The individual contractor(s) is responsible for designing and constructing stable, temporary excavations as required to maintain stability of both the excavation sides and bottom. All excavations should be sloped or shored in the interest of safety following local, and federal regulations, including current OSHA excavation and trench safety standards. Fill Materials and Placement Clean on-site soils or approved imported materials may be used as fill material. Imported soils (if required) should conform to the following: Gradation Percent fines by weight (ASTM C136) Engineered fill should be placed and compacted in horizontal lifts, using equipment and procedures that will produce recommended moisture contents and densities throughout the lift. Recommended compaction criteria for engineered fill materials is 95% of maximum dry density as determined by the standard Proctor method ASTM D698. On-site and imported sand soils should be compacted within a moisture content range of 4 percent below to 2 percent above optimum unless modified by the project geotechnical engineer. Excavation and Trench Construction Excavations into the on-site soils will encounter a variety of conditions, including caving soils and possibly groundwater. The individual contractor(s) should be made responsible for designing and constructing stable, temporary excavations as required to maintain stability of both the excavation sides and bottom. All excavations should be sloped or shored in the interest of safety following local, and federal regulations, including current OSHA excavation and trench safety standards. 7