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Grijlin Really SA, Inc.-Geotechnical Investigation <br />Law/Crandall Project 70131-7-0261.0001 <br />July 8. 1997 <br />wind of seismic loads. Footings should extend at least 2 feet below the adjacent final grade. Since <br />the recommended bearing value is a net value, the weight of concrete within the footings may be <br />taken as 50 pounds per cubic foot, and the weight of soil backfill may be neglected when <br />determining the downward load on the footings. <br />A coefficient of friction of 0.4 can be used between the floor slab and the supporting soils. The <br />passive resistance of natural soils or properly compacted fill soils can be assumed to be equal to <br />the pressure developed by a fluid with a density of 300 pounds per cubic foot. A one-third increase <br />in the passive value can be used for wind or seismic loads. The frictional resistance and the <br />passive resistance of the soils can be combined without reduction in determining the total lateral <br />resistance. <br />6.2 SITE COEFFICIENT AND SEISMIC ZONATION <br />The site coefficient, S, can be determined as established in the Earthquake Regulations under <br />Section 1628 of the Uniform Building Code, 1994 edition, for seismic design of the proposed <br />building. Based on a review of the local soil and geologic conditions, the site can be classified as <br />Soil Profile S2, and the site coefficient (S) can be taken as equal to a value of 1.2, as specified in <br />the code. The site is located within UBC Seismic Zone 4. <br />6.3 EXCAVATION AND SLOPES <br />Excavation of about 15 feet deep will be required for the basement level. Where the necessary <br />space is available, temporary unsurcharged embankments may be sloped back at 1: 1 without <br />shoring. Where space is not available, shoring will be required. Data for design of shoring are <br />presented in a following section. <br />The excavations should be observed by personnel of our firm so that any necessary modifications <br />based on variations in the soil conditions encountered can be made. All applicable safety <br />requirements and regulations, including OSHA regulations, should be met. <br />7