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As presently defined by the State of California, most refined petroleum products <br />(gasoline, diesel fuel, motor oil, grease, coolant, etc.) have chemical constituents that <br />are considered to be hazardous waste. As such, the indiscriminate dumping or spillage <br />of these fluids onto the ground may constitute a misdemeanor, punishable by fines <br />and/or imprisonment, and shall not be allowed. The contractor is responsible for all <br />hazardous waste relating to his work. The Geotechnical Consultant does not have <br />expertise in this area. If hazardous waste is a concern, then the Client should acquire <br />the services of a qualified environmental assessor. <br />2.2 Processing: Existing ground that has been declared satisfactory for support of fill by <br />the 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 free <br />from oversize material and the working surface is reasonably uniform, flat, and free <br />from uneven features that would inhibit uniform compaction. <br />2.3 Overexcavation: In addition to removals and overexcavations recommended in the <br />approved geotechnical report(s) and the grading plan, soft, loose, dry, saturated, <br />spongy, organic -rich, highly fractured or otherwise unsuitable ground shall be <br />overexcavated to competent ground as evaluated by the Geotechnical Consultant during <br />grading. <br />2.4 Benching. Where fills are to be placed on ground with slopes steeper than 5:1 <br />(horizontal to vertical units), the ground shall be stepped or benched. Please see the <br />Standard Details for a graphic illustration. The lowest bench or key shall be a <br />minimum of 15 feet wide and at least 2 feet deep, into competent material as evaluated <br />by the Geotechnical Consultant. Other benches shall be excavated a minimum height <br />of 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: All areas to receive fill, including removal and <br />processed areas, key bottoms, and benches, shall be observed, mapped, elevations <br />recorded, and/or tested prior to being accepted by the Geotechnical Consultant as <br />suitable to receive fill. The Contractor shall obtain a written acceptance from the <br />Geotechnical Consultant prior to fill placement. A licensed surveyor shall provide the <br />survey control for determining elevations of processed areas, keys, and benches. <br />3.0 Fill Material <br />3.1 General. Material to be used as fill shall be essentially free from organic matter and <br />other deleterious substances evaluated and accepted by the Geotechnical Consultant <br />prior to placement. Soils of poor quality, such as those with unacceptable gradation, <br />high expansion potential, or low strength shall be placed in areas acceptable to the <br />Geotechnical Consultant or mixed with other soils to achieve satisfactory fill material. <br />LGC Valley, Inc. <br />General Earthwork and Grading Specifications <br />Pag i Council 18 — 962 10/3/2023 <br />