6500 MERRILL CREEK PKY BASE FILE 2016-01-01 MF Import

The Quaclrant Corporatio� JN 95292 September 28, 1995 Page 4 Slabs-on-Grade The building floors may be constructed as slabs-on-grade atop the compacted fill soils. The subgrade soils must be in a firm, non-yielding condition at the time of slab construction or underslab fill placement. Any soft areas encountered should be excavated and re�laced with select, imported, structural filL All slabs-on-grade should be underlain by a capillary break or drainage layer consisting of a minimum 4-incii thickness of coarse, free-draining, slructural fill with a gradation similar to that discussed later in Permanen.t Fourldation and Retaininq a s. 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 h eneath the slab. Additionally, sand should be used in the fine-grading process to reduce damage to the vapor barrier, to provide uniform support under the slab, and to reduce shrinkage cracking by improving the concrete curing process. We recommend proof-rolling the slab areas with a heavy truck or large piece of construction equipment prior to s!ab construction. Any soft areas encountered during proof-rolling should he excavated and replaced with select, imported, structural fili. • er ar�ent Foundatio a d�eta'i�ing WaIJ_s_ Retaining walls bacMilled on only one side should be designed to resist the lateral earth pressures imposed by the soils they retain. The following recommended design parameters , are for walls less than 12 feet in height that restrain level bacMill: Parameter � DesJgn Value Active Earth Pressure* 35 pcf Passive Earth Pressure 350 pcf Coefficient of Friction 0.45 Soil Unit Weight 135 pcf Where: (1) pcf is pounds per cubic foot. (2) Active and pussive earth pressures are corc�puted using the equivaient iluid densities. * For restrained �valis ihat cannot deilect at least 0.002 times their heighi, a uniform lateral pressure of i00 p�� sheu�� be added to the above active equivalEnt i!� , pressure. GIiO'iliCi I CONSUI.'li\N'IS,ING