ARCHIVED REPORTS_2008_29 - Laserfiche WebLink

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WMU E is the ash monofill known as the Eastern Ash Disposal Pit. This unit was constructed in 1987 to encompass approximately 4 acres and was expanded in 1992 by an additional 2 acres. It is lined with a minimum 2-foot thick compacted clay liner and contains a blanket LCRS. An interface liner was placed over the northern, eastern, and western sides of WMU in 1999 and 2000 to separate the ash from designated waste that would be placed above it. A final cover was placed on the southern side in 1999. WMU F North is an approximately 1-acre leachate impoundment located just north of the South Creek on the western side of the site. WMU F North was constructed in 1999 as a double lined unit and contains a GCL overlain by a 60-mil HDPE geomembrane, a geonet, and an additional 60-mil HDPE geomembrane. The leachate impoundment was sized based on actual leachate generation records from 1991 to 1997 and has a design capacity of approximately 3.5 million gallons. Soil treatment and sludge drying is permitted to occur in WMU G. WMU G is divided into G-North and G-South, according to whether they are north or south of the South Creek. The WMU G units occupy the same areas as WMUs D and Future H. The WMU D units have replaced WMU G-North. As currently permitted, WMU Future H will replace WMU G-South to accommodate waste disposal. FL has not been treating soils or drying sludge during the last several years. If these activities were to occur, appropriate lining systems would be installed. The northern portion of FL encompasses the 123.9-acre former Austin Road Landfill, located along the northern boundary. The former Austin Road Landfill began accepting municipal solid wastes in 1954 and did not contain a base liner or leachate collection and removal system (LCRS). Wastes were initially landfilled utilizing the trench method. Trenches were excavated to an approximate 20-foot depth with the excavated materials used for daily cover. The top deck of the former Austin Road landfill has been graded to drain to the south. A final cover was placed on a portion of the top deck and on the entire original northern slope. The 4-ft thick final cover consists of a 1-ft thick vegetative layer underlain by a 1-ft thick low permeability clay liner (permeability less than 1 x 196 cm/sec) and a 2-ft thick foundation layer. Forward Landfill- Project Description 4-3 BRYAN A.STIRRAT S ASSOCIATES ():\Allied\Forward\2007.0018 Lateral Expansion\Reports\Prof Descrip\021308 Final Proj Des\Sec 4.doc:2/13/2008)