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below the required 90 percent <br />density, the particular layer or <br />portion shall be reworked <br />until the required density has <br />been obtained. <br />s) Removal and re - <br />compaction of existing <br />fill and loose native soils <br />will be required to <br />provide adequate support <br />for foundations and slabs <br />on grade. <br />t) Removals shall extend <br />downward into competent <br />earth materials or to at least <br />2 feet below proposed <br />footing bottoms, whichever <br />is deeper. <br />u) The exposed excavation <br />bottom shall be observed and <br />approved by the Geotechnical <br />Engineer. Subsequent to <br />approval of the excavation <br />bottom, the area shall be <br />scarified6 inches, moisture <br />conditioned as needed, and <br />compacted to a minimum of <br />90 percent relative <br />compaction. <br />v) Fill soils shall be placed in 6 <br />to 8-inch loose lifts, moisture <br />conditioned as needed, and <br />compacted to a minimum of <br />90 percent relative - <br />compaction up to finish grade. <br />w) All utility line backfills, both <br />interior and exterior, shall <br />consist of clean sand and <br />gravel, and be compacted to a <br />minimum of 90 percent <br />relative compaction and shall <br />require testing at a maximum <br />of 2-foot vertical intervals. <br />MM GEO-5 <br />In the event that buried paleontological <br />Contractor <br />Ongoing <br />resources or geologic features are <br />and Building <br />during <br />encountered during grading, work in the <br />Official/ <br />Construction <br />Resolution No. 2020-xx <br />Page 16 of 20 <br />75D-21 <br />