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Grifin Realry SA, inc.-Geotechnical Investigation <br />tizw/Crandall Project 70131-7-0261.0001 <br />July 8. 1997 <br />Where sloped embankments are used, the tops of the slopes should be barricaded to prevent <br />vehicles and storage loads within 5 feet of the tops of the slopes. A greater setback may be <br />necessary when considering heavy vehicles, such as concrete trucks and cranes; we should be <br />advised of such heavy vehicle loadings so that specific setback requirements can be established. If <br />the temporary construction embankments are to be maintained during the rainy season, berms are <br />suggested along the tops of the slopes where necessary to prevent runoff water from entering the <br />excavation and eroding the slope faces. The soils exposed in the cut slopes should be inspected <br />during excavation by our personnel so that modifications of the slopes can be made i f variations in <br />the soil conditions occur or if adverse water seepage conditions are developed. <br />6.4 SHORING <br />General <br />Where there is not sufficient space for sloped embankments, shoring will be required. One method <br />of shoring would consist of cantilevered steel soldier piles placed in drilled holes and backfilled <br />with concrete. The soldier piles can also be retained with drilled-in earth anchors or raker bracing. <br />Caving and raveling of the granular soils should be considered during installation of the soldier <br />piles. Special techniques and measures may be necessary in some areas to permit the proper <br />installation of the soldier piles. <br />The following information on the design and installation of the shoring is as complete as possible <br />at this time. We can furnish additional required data as the design progresses. Also, we suggest <br />that our firm review the final shoring plans and specifications prior to bidding or negotiating with <br />a shoring contractor. <br />Lateral Pressures <br />For design of cantilevered shoring, a triangular distribution of lateral earth pressure may be used. <br />It may be assumed that the retained soils with a level surface behind the cantilevered shoring will <br />exert a lateral pressure equal to that developed by a fluid with a density of 30 pounds per cubic <br />foot. <br />8