Compacted soil liner study completed

Journal Article · Tue Nov 01 04:00:00 EST 1988 · JAPCA, Int, J. Air Pollut. Control Waste Manage.; (United States)

OSTI ID:5992333

McClelland Engineers, Waste Management Services, announced its conclusions from an EPA-funded research project on the permeability of compacted clay liners for hazardous waste landfills. The results of the three-year EPA Liner Study will set safer criteria for the regulation, design and construction of landfill liners and caps. As the design of landfills became more environmentally sound, evidence indicated that clay liners, once thought to be impermeable, could be permeable under the right conditions. Under some circumstances, we found that seepage occurred predominantly through macrovoids between soil clods and along the interlift boundary. Historically, it has been thought that seepage migrates only through the finer pores between the soil particles in the clods. This was proved not to be the case. With the primary seepage paths identified, we found that for clay liners to meet the 1 x 10/sup /minus/7/ cm/sec or less federal permeability specification, certain construction objectives had to be achieved. To meet these objectives, one must choose an appropriate combination of these variables; moisture content of the soil; type and weight of the roller; thickness of each lift; size of clods before compaction; and number of passes by the roller. With these conclusions, we now know how to design and construct less permeable clay liners and caps to better protect the soil and groundwater from contamination. However, further research is needed to assess roller performance and laboratory testing methods for predicting and evaluating soil liner permeability.

• OSTI ID: 5992333
• Journal Information: JAPCA, Int, J. Air Pollut. Control Waste Manage.; (United States), Journal Name: JAPCA, Int, J. Air Pollut. Control Waste Manage.; (United States) Vol. 38:11; ISSN JIJME
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CLAYS
CONTAMINATION
DISPERSIONS
GROUND WATER
HAZARDOUS MATERIALS
HYDROGEN COMPOUNDS
LEACHATES
MANAGEMENT
MATERIALS
MIXTURES
OXYGEN COMPOUNDS
PERMEABILITY
SANITARY LANDFILLS
SOILS
SOLUTIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WATER