2505 PACIFIC AVE 2018-01-01 MF Import

JN 92276 Sierra C�nstruction Services . �nc. pege 7 July 1 . 1992 PERtiA6EtiT FOU6DAT 1 ON AI�1D RETA 1 N 1 NG WALLS Reteining walls backfilled on one side onlosed�uby btheeSso�ls to resist lateral earth pressures imp retained by these structures. The following recommended design parameters are for walis less tha� twelve (12) feet i� � height which restrain level backfill : Design r Velue Active Eerth Pressure" ;50 pcf Passive Earth Pressure 0.40 Coefficient of Friction 130 pcf Soil Unit Weight Where: � ) pcf is pounds per cubic foot 2) Active a�d passive earth pressures are computed using the equivalent fluid � densities . * For restrained Walls which cannot deflect at least O .a02 times the wall heighL, a uniform lateral pressure of one hundred �100) psf should be added to the active equivalent fluid pressure. The values given above are to be used for design of permenent foundation nnd retaining walls only. The passive pressure given is eppropriate onty for the depth of level structurel f� ll pleced in front of a reteini�9 °r�fednwhen desWening the ap ropr�ate safety factor should be app wa�� s , we recommend using a factor of safety of at east 1 .5 ' for overturning and sliding . The ebove design values do not include the effects of any � hydrostatic pressures behind the �aced above themMalls�t If surcherge slopes or loads will be p these conditions exist, then those pressures �hould be edded iven the to the ebove lateral pressures. Also, if sloping beckfill � s desired behind the wa11s , then we will need to be 9 �avide wa11 dimensions and slope of the backfill in order to p ' the appropriate desig� earth pressures . !�` MeavY construction equipment should not be operated behind , . ,, ,�' ` _ retei ni �9 and foundati on v+al l s wi thi n a di stance equal to the �" ' height of the wall , unless the walls are designed for the ;T:, . _� ' ;�.�r: -, '. ' GEOTECH CONSULTANTS , INC.