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

, . `� �i The Quadrant Corporation JN 95292 September 28, 1995 Page 6 �av_ement Areas All pavement sections may be supported on competent, native soils, compacted fill, or preexisting fill, provided these soils can be compacted to a 95 percent density and are in a stable, non-yielding condition at the time of paving. Structural fill or fabric may be needed to stabilize soft, wet, or unstable areas. We recommend using Supac 5NP, manufactured by Phillips Petroleum Company, or a non-woven fabric with equivalent strength and permeability characteristics. In most instances where unstable subgrade conditions are encountered, 12 inches of granular, structural fill will stabilize the subgrade, except for very soft areas where additional fill could be required. The subgrade should be evaluated by Geotech Consultants, Inc., after the site is stripped and cut to grade. Recommendations fnr the compaction of structural fill beneath pavements are given in a later sub-section entitled General Earthwork and StructuCa� FJl1• The performance of site pavements 'is directly related to the strength and stability of the underlying subgrade. The pavement for lightly loaded traftic and parking areas should consist of 2 inches of asphalt concrete (AC) over 4 inches of crushed rock base (CRB) or 3 inches of aspha�t- treated base (ATB). We recommend providing heavily loaded areas with 3 inches of AC over 6 inches of CRB or 4 inches of ATB. Heavily loaded areas are lypically main driveways, • dumpster sites, or areas with truck traffic. Where the subbase is composed of silty, water-sensitive soils and irrigated landscaping is adjacent to and at an elevation higher than the pavement, we suggest installing perimeter drains to interFept the water that would otherwise saturate the pavement subbase. The pavement section recommendations and guidelines presented in this report are based on _ our experience in the area and on what has been successful i�� similar situations. We can provide recommendations based on expected traffic loads and R-value tests, if requested. Some maintenance and repair of limited areas can be expected. To provide for a design without the need for any repair would be uneconomical. LI_MITATIONS This report has been prepared for the exclusive use of the Quadrant Corporation and its representatives for specific application to this project and site. Our recommendations and conclusions are based on observed site materials, and selective laboratory testing and engineering analyses. Our conciusions and recommendations are proiessional opinions derived in accordance with current standards of practice within the scope of our services and within budget and time constraints. No warranty is expressed or implied. The scope of our services does not include services related to construction satety precautions, and our recommendations are not intended to direct the contractor's methods, techniques, sequences, or procedures, except as specificaily described in our report for consideration in GISO'IliCll CONSUL'1'ANIS.WC.