9 First American Way - Soils Report

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Lutzky Associates Development. LP - Geolechnical Investigation MACTEC Project 4953-03-2631 September 18. 2003 Alternatively, a drainage system could be placed behind the walls below grade to help dissipate the hydrostatic forces that may develop behind the walls. If the design of such a drainage system is required, the recommendations can be provided. 6.9 EXCAVATION AND SLOPES Based on the information provided to us,excavation to about 8 feet below ground surface will be required for the construction of the proposed Data Center. Where excavations are deeper than 4 feet and i f the necessary space is available, temporary un-surcharged embankments may be sloped back at 1: 1 without shoring Adjacent to any existing structure, excavations without shoring should not extend below a 2:1 (horizontal to vertical) plane extending downward from the bottoms of the adjacent building foundations and care should be exercised not to undermine existing ftoor slabs. Where space is not available for temporary embankments, temporary shoring may be used as discussed in Section 6.10, Shoring. The excavations should be observed by personnel of our firm so that any necessary modifications based on variations in the soil conditions encountered mhy be made. All applicable safety requirements and regulations, including OSHA regulations, should be met. Where sloped embankments are used, the rops of the slopes should be barricaded to prewlt vehicles and storage loads within 5 feet of the tops of the slopes. A greater setback may be necessary when considering heavy vehicles, such as concrete trucks and cranes; we should be advised of such heavy vehicle loadings so that specific setback requirements may be established. If the temporary construction embankments are to be maintained during the rainy season, berms are suggested along the tops of the slopes where necessary to prevent runoff water from entering the excavation and eroding the slope faces. 28