1716 EDGEMOOR LN 2016-01-01 MF Import

JN 90016 Roth Quality Homes page 7 January 25 . 1990 Design arameter Value Active Earth Pressure* 250 pcf Passive Earth Pressure p . 35 Coefficient of Eriction 120 pcf soil Unit Weight Where: 1 ) pcf is pounds per cubic foot 21 Active and Passive Earth Pressur.es are computed using equivalent fluid densities * For restrained walls which cannot deflect at least 0 .002 times the wall height, 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 desiqn of p!:rmanent foundation and retaining walls only. The value given for passive earth pressure is valid only for the depth °=o =iate structural fill placed in front of the wall . An aPP P factor of safety should be applied when designing the walls . We recommend using, a safety factor of at least 1 .5 for overturning and sliding. The above design values do not include the effects of any hydrostatic pr�ssures behind the walls and assume that no surcharge slopes or loads will be placed above the walls . If these conditions exist, then those pressures should be added to the above lateral pressures . The effect of vehicle traffic on the driveway can be accounted for by designing the walls adjacent to the dr'.veway for an additiofalslosonl surcharge of two ( 2) feet in thickness . Also , P 9 backfill is desired behind retaining or foundation walls , then we will need to be given the wall dimensions and slope of the backfill in order to provide the appropriate design earth pressures . Retaining Wall Backfill Backfill placed within eighteen ( 18 ) inches of any retaining or foundation walls should be free-draining structural fill containing no organics . This backfill should contain no more than five ( 5 ) percent silt or clay GEOTECH CONSULTANTS , INC.