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the appropriate laboratory test. <br />SLOPE COMPACTION <br />when the slope of the natural ground <br />receiving fill exceeds 20% (5 horizontal units to 1 vertical <br />unit), the original ground shall be stepped or benched. Benches <br />shall be cut to firm, competent soil. The lower bench shall be <br />at least 10 feet wide or 1 1/2 times the equipment width, which- <br />ever is greater, and shall be sloped back into the hillside at a <br />gradient of not less than two (2) percent. All other benches <br />shall be at least 6 feet wide. The horizontal portion of each <br />bench shall be compacted prior to receiving fill as previously <br />recommended for compacted natural ground. Ground slopes flatter <br />than 20X may be benched, when considered necessary by the Geo- <br />technical Engineer. <br />• Fill slopes shall be compacted by ap- <br />proved equipment to the relative compaction specified in the <br />Geotechnical Report. Compacting the slope surface may be done <br />progressively in increments of three to five feet in fill height <br />or after the fill is brought to its total height. The interior <br />shall be compacted by the "horizontal" methods previously out- <br />lined. Slopes having a horizontal to vertical ratio steeper than <br />2:1 (H:V) shall be overfilled by at least 5 feet and then cut <br />back to the desired slope ratio. <br />CUT SLOPES <br />The Geotechnical Engineer will observe <br />• all cut slopes during the grading operations at intervals deter- <br />mined at his discretion. If any conditions not anticipated in <br />16 <br />