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This preparation includes steps after mass excavation, such as:
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Establishing the base of the excavation at the correct elevation, which should be checked using a laser level;
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Locating the base of the elevation about 6 inches below the lowest layer of geogrid. That way, the lowest layer of geogrid will be surrounded by new, compacted and tested soil; and,
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Cleaning the base of the excavation to remove all soft, loose, wet, frozen, baked-dry, or otherwise disturbed soil.
