5109 SOUND AVE 2017-08-02 - Laserfiche WebLink

July 21, 2014 Two Single-Family residences L&A Job No. 14-065 Page 18 used. The above soil parameters are unfactored values, and a proper factor of safety should be used in calculating the resisting forces against lateral loads on the buildings. SLAB-ON-GRADE FLOORS Slab-on-grade floors, if used for the proposed residences, should be placed on finr� subgrade soil prepared as outlined in the SITE PREPARATION AND GENERAI. EARTHWORK and the STRUCTURAL FILL sections of this report. Where moisture control is critical, the slab-on-grade floors should be placed on a capillary break which is in turn placed on the compacted subgrade. The capillary break should consist of a minimum four-inch-thick layer of clean, free-draining, 7/8-inch crushed rock, containing no more than 5 percent by weight passing the No. 4 sieve. A vapor barrier, such as a 6- mil plastic membrane, may be placed over the capillary break, as required, to keep moisture from migrating upwards. PAVED DRIVEWAYS Performance of driveway pavement is critically related to the conditions of the underlying subgrade soils. We recoinmend that the subgrade soils under the driveways be treated and prepared as described in the SITE PREPARATION AND GLNERAL EARTHWORK section of this report. Prior to placing base material, the subgrade soils should be compacted to a non-yielding state with a vibratory roller compactor and proof- rolled with a piece of heaw constructian equipment, such as a fully-load�d dump truck. Any areas with excessive fle�ng or pumping should be over-excavated and re-compaeted or replaced with a structural fill or crushed rock placed and compacted in accordance with the recominendations provided in the STRUCTURAL FILL section of this report. LIU & ASSOCIATES, INC.