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LEIGHTON CONSULTING, INC. <br />General Earthwork and Grading Specifications <br />If potentially hazardous materials are encountered, the Contractor shall stop work <br />in the affected area, and a hazardous material specialist shall be informed <br />immediately for proper evaluation and handling of these materials prior to <br />continuing to work in that area. <br />As presently defined by the State of California, most refined petroleum products <br />(gasoline, diesel fuel, motor oil, grease, coolant, etc.) have chemical constituents <br />that are considered to be hazardous waste. As such, the indiscriminate dumping <br />or spillage of these fluids onto the ground may constitute a misdemeanor, <br />punishable by fines and/or imprisonment, and shall not be allowed. <br />2.2 Processing <br />Existing ground that has been declared satisfactory for support of fill by the <br />Geotechnical Consultant shall be scarified to a minimum depth of 6 inches. <br />Existing ground that is not satisfactory shall be overexcavated as specified in the <br />following section. Scarification shall continue until soils are broken down and <br />free of large clay lumps or clods and the working surface is reasonably uniform, <br />flat, and free of uneven features that would inhibit uniform compaction. <br />2.3 Overexcavation <br />In addition to removals and overexcavations recommended in the approved <br />geotechnical report(s) and the grading plan, soft, loose, dry, saturated, spongy, <br />organic-rich, highly fractured or otherwise unsuitable ground shall be <br />overexcavated to competent ground as evaluated by the Geotechnical Consultant <br />during grading. <br />2.4 Benching <br />Where fills are to be placed on ground with slopes steeper than 5: 1 (horizontal to <br />vertical units), the ground shall be stepped or benched. Please see the Standard <br />Details for a graphic illustration. The lowest bench or key shall be a minimum of <br />15 feet wide and at least 2 feet deep, into competent material as evaluated by the <br />Geotechnical Consultant. Other benches shall be excavated a minimum height of <br />4 feet into competent material or as otherwise recommended by the Geotechnical <br />Consultant. Fill placed on ground sloping flatter than 5:1 shall also be benched or <br />otherwise overexcavated to provide a flat subgrade for the fill. <br />2.5 Evaluation/Acceptance of Fill Areas <br />All areas to receive fill, including removal and processed areas, key bottoms, and <br />benches, shall be observed, mapped, elevations recorded, and/or tested prior to <br />being accepted by the Geotechnical Consultant as suitable to receive fill. The <br />Contractor shall obtain a written acceptance from the Geotechnical Consultant <br />F-3 <br />SL Rvcd 2019.01.21