2505 PACIFIC AVE 2018-01-01 MF Import

Sierra Construction Services , Inc. July 1 , 1992 JN 92276 Page 5 CONVENTIONAL �O NDATIntic The proposed structure can be supported on conventional continuous and spread footings bearing on undisturbed, competent, native soils or on structural fill placed above , competent native soils lying below any topsoil or filt soils . See the later sub-section e�titled �ENERAL EARTHwnar pND STR T aA Fi for recommendations regarding structural fill placement and compaction beneath structures . Continuous and ' individual spread footings should have minimum widths of shouldn be6�bottomed�tetfleast2twelvec(12) inchest�below the lowest adjacent finish ground surface. The footing subgrede must be cleaned of loose or disturbed soil prior to pouring concrete. Depending upon site and equipment constraints, this may require removing the disturbed soil by hand. Depending on the final site grades , some overexcavation maY be required below footings to expose competent native soils. theeSoverexcavationtmust beeattleast�ashwideeetXtheebottom��as the sum of the depth .of the overexcavation and the footing + width . For example, en overexcavation extending 2 feet below the bottom of a 3-foot-wide footing must be at least 5 feet wide at the base of the excavation. Footings constructed according to the above recommendations may be designed for an allowable soil bearing pressure of thousand (3000) pounds per square foot (psf) . A one-third increase in this design bearing pressure may be used when considering short-term wind or seismic loads. For the ebove design criteria , it is anticipated that total post- • natsveucso�ls Sortonmstructural �fil95upftonfeve �(5)c�feete�in thickness will be about one-incb, with differential settlements on the order of one-half inch in 50 feet. Lateral loads due to wind or seismic forces may be resisted by friction between the foundations and the bearin� soils, or by passive earth pressure acting on the vertical , embedded portions of the foundations. For the latter condition, the foundations must either be poured directly against relatively level , undisturbed soii or level structural fill must be placed around the outside of the foundation . We recommend the following design values be used for the foundation's resistance to lateral loading : GEOTECH CONSULTANTS, INC.