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- W29810013 abstract "In glaciated regions of North America, till is often regarded as the geologic medium of choice when selecting appropriate sites for landfill operations. This is especially true in southern Ontario, where intensive studies are presently being conducted to site municipal landfills to serve the Greater Toronto Area. Throughout this region many potential sites are situated on the Halton Till, a widespread surficial unit of Late Wisconsinan age. This study focuses on the hydraulic characteristics of the Halton Till utilizing two data sets from interim landfill site searches completed in 1990. Small scale methods of estimating hydraulic conductivity within the till such as rising/falling head tests and laboratory triaxial testing typically yield values on the order of 10[sup [minus]7] and 10[sup [minus]9] cm/s, respectively. In contrast, hydrochemical evidence, including the presence of elevated levels of Na, SO[sub 4], Cl and [sup 3]H within the till pore waters to depths of up to 40 meters suggests that vertical groundwater velocities may be in the order of 1.0 to 1.5 m/year. These data imply that contaminants such as farm fertilizers and road salt are migrating through the till at higher velocities than expected and that the bulk hydraulic conductivity may be 1 tomore » 3 orders of magnitude higher than values estimated from field and laboratory methods. Such findings can have serious implications for impact assessment studies required for landfill siting investigations.« less" @default.
- W29810013 created "2016-06-24" @default.
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- W29810013 date "1992-01-01" @default.
- W29810013 modified "2023-09-26" @default.
- W29810013 title "Migration of contaminants through till: Implications for the selection of the landfill sites" @default.
- W29810013 hasPublicationYear "1992" @default.
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