1716 EDGEMOOR LN 2016-01-01 MF Import

Roth Quality Homes JN 5Q016 January 25 , 1990 Page 6 of sixty (60 ) pounds per cubic foot (pcf ) acting over two times the pier diameter within the cantilever portion. The soil adjacent to the drilled �' er below the cantilever portion can be assumed to have a passive earth pressure equal r.o that exerted by a fluid having a density of three hundred (300 ) pcf acting on two times the pier diameter for design of the reinforcement and computation of allowable lateral pier loads . We recommend that the piers be reinforced for their entire length. SLABS-ON-GRADE The garage slab can be constructed as a slab-on-grade constructed over at least twelve ( 12) inches of granular structural fill placed above slopewash soils following removal of the surface organics . The subgrade soils must be in a firm, non-yielding condition prior to placement of the twelve ( 12 ) inches of underslab structural fill . . ' All slabs-on-grade should be underlain by a capillary break layer consisting of a minimum four ( 41 inch thickness of free-draining granular structural fill with a gradation similar to that discussed later in PERMANENT EOUNDATION AND RETATNING WALLS . If free-draining structural fill with this gradation is used for the twelve ( 12) inches of underslab fill discussed above, the additional four (4 ) inches of free- draining fill is not necessary. Isolation joints should be provided where the slab intersects columns and walls . In areas where the passage of moisture through the slab is undesirable, a vapor barrier such as a 6-mil plastic membrane should be placed beneath the slab. Additionally: sand should be used in the fine grading process to provide uniform support under the slab and to minimize damage to the vapor barrier . PERMANENT FOUNnaTrON AND RETAINING WALLS Retaining walls backfilled on one side only should be designed to resist lateral earth pressures imposed by the soils retained by these structures . The following recommended design parameters are for walls less than twelve ( 12) feet in height which restrain level backfill : GEOTECH CONSULTANTS , INC.