Landfill Liners

A panoramic image of the landfill liner
Sanitary Landfill Liners
Currently there are 7 lined cells (pads) located on the landfill.
Pad 1
Pad 1 opened in August 1991 and reached capacity in late 1996. The cost for construction of the lined area was $400,000 per acre.

The liner system of Pad 1 is composed of 9 layers:
  1. 6 inch clay
  2. 16 ounce of Geotextile Polyfelt (like a wool blanket or a felt material)
  3. 60 mil high density Polyethylene liner (may be either smooth or textured depending on how resistant to slipping the design required, and resistant to tears, chemicals, and punctures)
  4. 16 ounce of Geotextile Polyfelt
  5. 2 layers of Geo Net-Drainage Netting
  6. 16 ounce Geotextile Polyfelt
  7. 60 mil of high density Polyethylene liner
  8. 16 ounce Geotextile Polyfelt
  9. 18 inches of 1/2 inch stone containing a network of leachate collection pipes
Construction of liner pad 1
Pad 2 & 3
Pad 2 and Pad 3 were constructed in 1995. Pad 2 opened in October 1995 and Pad 3 January 1999. Pad 2 and Pad 3 combined have a life expectancy of 6 to 8 years. The cost for construction of the lined areas was $323,000. Both of these pads were constructed of 6 layers:
  1. 1/4 inch Claymax (Bentonite Clay inside 2 fabrics)
  2. 60 mil high density Polyethylene liner (may be either smooth or textured depending on how resistant to slipping, the design required, and resistant to tears, chemicals, and punctures)
  3. 2 layers of Geo Net-Drainage netting
  4. 60 mil high density Polyethylene liner
  5. 16 oz Geotextile Fabric (non-woven)
  6. 18 inches of 1/2 inch stone containing a network of leachate collection pipes
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Pad 4 & 6
Pad 4 and Pad 6 were constructed in 2001. Pad 4 opened in October 2001 and Pad 6 opened in September 2003. Pad 4 and Pad 6 have a combined life expectancy of 10 years. It cost $246,000 per acre just to build these sites. Both of these pads were also constructed of 6 layers:
  1. 1/4 inch Claymax (Bentonite Clay inside 2 fabrics)
  2. 60 mil high density Polyethylene liner (may be either smooth or textured depending on how resistant to slipping, the design required, and resistant to tears, chemicals, and punctures)
  3. 2 layers of Geo Net-Drainage netting
  4. 60 mil high density Polyethylene liner
  5. 16 oz Geotextile Fabric (non-woven)
  6. 18 inches of 1/2 inch stone containing a network of leachate collection pipes
Construction of liner pad 4

Pad 5 & 7

Pad 5 and Pad 7 were constructed in 2007. Pad 5 opened in July 2008 and Pad 7 was opened in October 2014.
It cost $330,000 per acre just to build these sites. Pad 5 and Pad 7 have a combined life expectancy of 15 years. Both of these pads were constructed of 6 layers:
  1. 1/4 inch Claymax (Bentonite Clay inside 2 fabrics)
  2. 60 mil high density Polyethylene liner (may be either smooth or textured depending on how resistant to slipping the design required, and resistant to tears, chemicals, and punctures)
  3. 1 layer of Geocomposite Net-Drainage netting (netting with fabric on the top and bottom)
  4. 60 mil high density Polyethylene liner
  5. 16 ounce Geotextile fabric (non-woven)
  6. 18 inches of 1/2 inch stone containing a network of leachate collection pipes
Pad Construction
All the material arrives on the site in rolls of different width. The Claymax layer is overlapped when placed. The fabric pieces in the Geotextile layer are sewn together with portable sewing machines. The polyethylene liner is seamed with a portable hot welder which, using heat and pressure together, joins the pieces together in an extremely strong "fusion weld".