4020 COLBY AVE Geotech Report 2018-01-02 MF Import

McDonald's Corporation E-3�76 December 21, 1987 Page b We suggest that the qround be slope� 3 percent for a distance of at least ten feet away irom the buildings except in areas that are to be paved. If wet season work is anticipated some form of cover should bE placed over the subgrade. The cover could be in the form of ATB or crusY.ad rock. As an alternative the site subgrade could be left high. Just before pavin3 the site, the finish grading would be completed and then paving ta}=e place as soon as possible after the grading. Pavement Areas All parking and roadway areas may be supported oti native soils provided those soils can be compacted to 95 per.cent density and are statle at the time of constructicn. Structural fill and/or fabric a�ay be needed to stabilize soft, wet or Ltnstable areas. In most instances twelve (12) inches of granular fill will stabilize the subgrade except for very soft areas where greater thicknesses may be required. The upper twelve (12) inches of pavement subgrade should be compacted to at least 95 percent of the maximum density. Below this level a compactive effort of 90 percent would be adequate. The pavement section for lightly loaded traffic and parking areas should consist of three inches of Asphalt Concrete (AC) over four inches of crushed roc?: base (CRB) or three inclies of ATB. This pavement section is the minimum section specified by the McDonald's Corporation. Heavier loaded areas would require thicker sections. We will be pleased to assist you in developing appropriate pavement sections or specific:,cions for heavy traffic zones, if needed. Site Preoaration and General Earthwork Following the e.xcavation, the ground surface where structural fill, foundations, c,r slabs are to be placed should bA proofrolled. Proofrolling a�ay accomplished with either a loaded dump truck or a large self propelled compactor. All proofrolling shoulci be per- formed under the observation of a representative of ECi. Soil in any loose or soft areas should be removed and replaced wi�.h struc- tural fill to a depth that will provide a stable base baneath the general structural fill. Structural fill under. floor slabs and footings should be placed in hori�ontal lifts and compacted to a minimum 95 perc2nt of thc maximum dry density in accordance with ASTM Test Desiqnation D-1557- 70 (Modified Proctor) . The fill materials should be placed at or near the optimum moisture content. Fill ur.der pavements and walks should also be placed in horizontal lifts and compacted to 90 Earth Consultants. Inc.