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time, place, and manner, but in no event later than 15 days after the request is made. OSHA is <br />provided immediate access. <br />It is up to the employer to assure that either a copy of the requested information is <br />provided without cost, or facilities for photocopying are made available without cost, or the <br />material is loaned to the individual for a reasonable time to enable a copy to be made. <br />Geofon will maintain Material Safety Data Sheets for all hazardous chemicals as long as <br />the substance is found on site and for at least 30 years after departure from the site. <br />4.36 EXCAVATION SAFETY <br />4.36.1 Definition <br />EXCAVATION - A man-made cavity or depression in the earth's surface, including its' <br />sides, walls, or faces formed by the removal of materials, and producing unsupported earth <br />conditions by reason of such removal. If installed forms or similar structures reduce the depth - <br />to -width relationship, the excavation may become a trench. <br />4.37 OTHER HAZARDS <br />4.37.1 Falls and Equipment <br />In addition to cave-in hazards and secondary hazards related to cave-ins, there are other <br />hazards from which workers must be protected during excavation -related work. These hazards <br />include exposure to falls, falling loads, and mobile equipment. To protect employees from these <br />hazards, the employee must take the following precautions: - <br />43 <br />