6807 EVERGREEN WAY 2016-01-01 MF Import

GEOTECHNICAL ENGIMEERING STUDY JMD Architecture April 19, 1999 E-8689 Page 6 With structural loading as expected, total se:tlement in the range of one inch is anticipated with differential movement of about one-half inch. Most of the anticipated settlsments should occur during construction as dead IoadS are applied. Horizontal loads can be resisted by friction between the base of the foundation and the supporting soil and by passive soil pressure acting on the face of tiie buried portion of the foundation. For the latter, the foundation must be poured "neat" against the competent native soils or backfilled with structural fill. For frictional capacity, a coefficient of .40 can be used. For passiv� earth pressure, the available resistance can be computed using an equivalent fluid pressure of three hundred fifty (350) pcf. These lateral resistance values are allowable values, a factor-of-�afety of 1.5 has been included. As movement of the foundation element is required to mobilize full passive resistance, the passive resistance should be neglected if such movement is not acceptable. Footing excavations should be observed by a representative of ECI, prior to placing forms or rebar, to verify that conditions are as anticipated in this repnrt. Slab-on-Grade Floors Slab-on-grade fluors may be supported on competent native soil or on structural fill used to modify site grades. Disturbed subgr��ie soil must either be: recompacted or replaced with structur�l fill. Slab-on-grade floors shc�id be designed by the structural engineer based on the anticipated loading and the subgrade support characteristics. A modulus of vertical subgrade reaction of two hundred fifty (250) pounds per cubic inch Ipci1 may be used for design. A capillary break and vapor barrier should be used to reduce the potential for moisture to penetrate the slab. The capillary break should consist of fo��r inches of sand or free-draining gravel. The vapor barrier should consist of 6-mil visqueE�n. Two inches of damp sand should be placed over the vapor barrier to protect it during consV��ction and aid in the curing o4 the concrete. Eerth Cansultmte. Inc.