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LEA Advisory 20 Attachment- Inspection Guidance for SW Landfills Page 22 of 52 Unloading of solid wastes shall be confined to as small an area as practicable. Adequate control of windblown materials shall be provided. Waste materials shall normally be deposited at the toe of the fill, or as otherwise approved by the Enforcement Agency. The unloading area at a disposal site should be just large enough to handle the number of vehicles using it without causing traffic safety problems, personnel or public safety hazards, or waiting or stacking up of vehicles. A smaller working face will minimize birds, vectors, dust, odor, and infiltration of moisture during storm events. Also, the amount of daily cover needed will be reduced. Spreading and Compacting 17677 Spreading and Compacting The refuse shall be spread and compacted in layers with repeated passages of the landfill equipment to eliminate voids within the cell that may produce potential rodent harborage. The loose layer should not exceed a depth of approximately two feet before compaction. Spreading and compacting shall be accomplished as rapidly as practicable, unless approved otherwise by the Enforcement Agency. Adequate spreading and compaction eliminates voids that can allow for the harborage of rodents, minimizes the risk of fire, minimizes subsidence which can lead to ponding and other problems, and saves landfill space. Compaction consists of repeated passes (3 to 5) over the waste with heavy equipment. Excessive "listing" and tipping of equipment during spreading of waste may indicate that waste is exceeding two feet prior to compaction - a violation of this standard. When a large number of waste loads are allowed to accumulate before spreading and compacting, the potential for a violation exists; it becomes increasingly difficult to spread the waste into layers less than two feet in thickness. Slopes/Cuts/Gradings 17678 Slopes and Cuts The slope of the working face shall be maintained at a ratio which will allow effective compaction of the wastes. The depth of cuts and slopes of trench sides shall not exceed horizontal to vertical ratios as approved by the Enforcement Agency. The slope of the working face should not be so steep that the equipment in use becomes unstable or unable to exert the proper compaction or that materials in the working face are at or near their angle of repose. The angle of repose is the maximum slope or angle at which a material such as soil or loose rock remains stable. When exceeded, mass movement by slipping as well as by water erosion may be expected. Generally, slopes greater than 1 3/4 : 1 (-30 degrees as determined by a clinometer) are too steep. The slope will affect the degree of compaction, with the greatest compaction being achieved with the least slope. 17710 Grading of Fill Surfaces Covered surfaces of the disposal area shall be graded to promote lateral runoff of precipitation and to prevent ponding. Grades shall be established of sufficient slopes to account for future http://www.ciwmb.ca.gov/pe/advisory/20/attach20/20attch l.htm 8/11/98