5107 SOUND AVE 2017-01-14 - 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 resisi:ing forces against lateral loads on the buildings. SLAB-4N-GRADE FLOORS Slab-on-grade floors, if used for the proposed residences, should be placed on finn subgrade soil prepared as outlined in the SITE PREPARATION AND GENERAL EARTHWORK and the STRUCTURAL FILL sections of this report. Where moisture control is criitical, the slab-on-grade fl�ors should be placed on a capillary break which is in turn placed on the compaeted subgrade. The capillary break should consist of a z��,�n�� c�vr-i�n�h-th?c�c l��x �f �1P�n, fr��-draining, 7/S-inch crushed rock, cor�tai�iing no more ihan 5 percent by we;ight p�ssing the N�. � si�v�. A vapor ba��e�, s��;h �s �� 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 prepai•ed as described in the SITE PREPARATION AND GENERAL EARTHWORK section of this report. Prior to placing base material, the subgrade soils should be compacted to a non-yielding state with a vibra#ory roller compactor and proof- rolled with a piece of heavy construction equipment, such as a fully-loaded dump truck. Any areas with excessive fle�ng or pu.mping should be over-excavaied and re-compacted or repiaced with a structural fill or crushed rock placed and compacted in accordance with the recommendations provided in the STRUCTURAL FILL section of this report. LIU & ASSOCIATES, INC.