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GEOMATRIX <br /> 5.2.4 Preparation of Building Pad <br /> Because of the nature of the soils at the site, we recommend that the pump station be founded <br /> on a pad of compacted granular fill material (i.e., crushed rock or aggregate base material). <br /> The purpose of the pad is to provide a uniform bearing surface for the completed structure, as <br /> well as to provide a reasonably sound working surface. If the exposed soil surface has not been <br /> significantly disturbed by construction equipment (as determined by the engineer), is uniform, <br /> and would provide a good bearing surface forthe planned pump station, the exposed surface <br /> should be compacted with at least six passes of a smooth, vibrating drum roller that weighs no <br /> less than 10,000 pounds to provide a reasonably smooth surface for the placement of the <br /> granular material. For"tight" excavations or hard-to-reach locations in the excavations, other <br /> compaction equipment may be utilized. <br /> If the exposed soil surface has been disturbed by construction equipment (as determined by the <br /> engineer), is not uniform, or would not otherwise provide a good bearing surface.for the <br /> planned structure, the upper 8 inches of the exposed soil surface should be scarified and/or ' <br /> bladed until it is uniform and free of large unbroken clods of soil. The moisture content should <br /> be brought to within the optimum and +3% of the optimum and compacted with equipment <br /> suitable for the soil and site conditions to not less that 90% of the maximum dry density, as <br /> determined by ASTM Method D1557. The compacted surface should be bladed/trimmed and <br /> rolled with a smooth drum roller to provide a reasonably smooth surface upon which to <br /> construct the pad. <br /> A layer of granular fill that conforms to the requirements of aggregate base material or crushed <br /> rock should be placed over the area of the pad, as described below in Section 5.2.5 - Fill <br /> . Materials and Compaction Criteria. The layer of granular fill should be at least to 12 inches <br /> thick and should extend beneath the perimeter wall footings. ' <br /> 5.2.5 Fill Materials and Compaction Criteria <br /> p . <br /> We anticipate that four principal fill types will be utilized at the site. These are (coarsest to <br /> p <br /> finest): <br /> f <br /> L1. crushed rock <br /> 2. permeable material <br /> 3. aggregate base material <br /> 4. site fill. <br /> r <br /> 1:1Aroject15000s153131LE W Is-MAN.DOC <br /> N <br />