1910 MERRILL CREEK PKY 2018-11-15

Intracorp E-3592-520 - September 23, 1998 Page 5 Once the building and pavement areas have been stripped, the ground surface where structural fill, foundations, or slabs are to be placed should be observed by a representative of ECI. Prior to placing the site fills, the existing surface should be proofrolled and compacted with a large vibratory drum roller. Loose or excessively soft areas identified by the roller should be aerated during dry weather and be recompacted, or be overexcavated and replaced with structural fill to a depth that will provide a stable base for the structural fill. A woven geotextile fabric may also be used to stabilize the overexcavation surface. For this application, Mirafi 600X or approved equivalent should be used. Proofrolling should be observed by a representative from ECI. Structural fill is defined as compacted fill placed under buildings, roadways, slabs, pavements, or other load-bearing areas. Structural fill under floor slabs and footings should be placed in horizontal lifts not exceeding twelve (12) inches in loose thickness and compacted to a minimum of 90 percent of its laboratory maximum dry density determined in accordance with ASTM Test Designation D-1557-91 (Modified Proctor). The fill materials should be placed at or near the optimum moisture content. Fill under pavements and walks should also be placed in horizontal lifts and compacted to 90 percent of maximum density except for the top twelve (12f inches which should be compacted to 95 percent of maximum density. During dry weather, most soils which are compactible and non-organic can be used as structural fill, provided they are near their optimum moisture content. Based on the results of our laboratory tests, the on-site soils at the time of our exploration appeared to be near the optimum moisture content and should be suitable for use in their present condition as structural fill, provided grading operations are conducted during dry weather. However, laboratory testing indicates that some of the site soils have more than five percent fines passing the No. 200 sieve. These soils will degrade if exposed to excessive moisture, and compaction and grading will be difficult if the soil moistures increase significantly above optimum moisture conditions. If the site soils are exposed to moisture and cannot be adequately compacted, it may then be necessary to import a soil which can be compacted. During dry weather, any non-organic compactible soil can be used. Fill for use during wet weather should consist of a fairly well graded granular material having a maximum size of three inches and no more than five percent fines passing the No. 200 sieve based on the minus 3/4-inch fraction. A contingency in the earthwork budget should be included for this possibility. Foundations Based on the encountered subsurface soil conditions, preliminary design criteria and assuming compliance with the preceding Site Preparation and Genera/Earthwork section, the proposed warehouse may be supported on conventional spread and continuous footing foundation systems bearing on the competent native soil or on structural fill placed to modify existing site grades. Earth Coneultants, Inc.