1136 GRAND AVE A&B 2016-01-01 MF Import

. � , April 23, 2007 Mc Scott Anderson L&A Job No. 6Al2G Pagc 10 Slab-on-Crade Floors Slab-on-grade floors, if used, should be placed on firm subgrade soils prepazed as ouUined in the Site Preparation and General Gradin[� 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 tum placed on the compacted subgrade. The capillary break should consist oF a minimum four-inch-thick layer of free-draining gravel or crushed rock containing no more than 5% by weight passing the No. 4 sievc. Wc rccommend that a vapor barricr, such as a 6-mil plastic membranc, be placed over the capillary brcak to keep moisture from migrating upwards. Driveway Pavement PerComiance of dri��eway pavement is critically related to the conditions of the underlying subgrade soils. We recommenJ that the subgrade soils under the roadway be treated and prepared as described in thc Site Preparation and General Gradine section of this report. Prior to placing base material, the subgrade soils, afier stripping of surficial unsuitable soils, should be compactcd to a non-yiclding st�tc with a mechanical compactor and proof-rolled with a piece of heavy construction equipment, such as a fully-loaded dump truck. Any arcas with excessive tlexing or pumping should be ovcr-cxcavated and re-compacted or replaccd with a structural fill or crushed rock placed and compacted in accordancc with thc recommendations provided in the Structural Pill section of this rcport. We recommend that a laycr of 4-inch-thick minimum, compacted, crushed rock base (CRB) of 7/8-inch-minus crushcd rock, be uscd for the driveway azea. The crushed rock base should be toppcd with 3-inch-thick Class B �uphalt concrctc (AC) or 4-inch concrete pavement reinforced with a luycr of welded �vire fabric at the mid-depth of the pavement. Catch basins should be installed in thc dri��eway to capturc and dmin away stortn runoff over the paved driveway. LIU & ASSOCIATES, INC.