Hydraulic conductivity and diffusion monitoring of the Keele Valley Landfill liner, Maple, Ontario

King, Kathryn S.; Quigley, Robert M.; Fernández, Federico; Reades, Denys W.; Bacopoulos, Angelos

doi:10.1139/t93-011

Cited by 51 publications

(26 citation statements)

References 5 publications

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“…The data appear to be log-normally distributed with standard deviation (log 10 ) of 0.1. The hydraulic conductivity is similar to that observed by King et al (1993) for the Keele Valley Landfill using a similar Halton Till and similar construction specifications. The liner had a degree of saturation (after compaction) of 86% or higher, and essentially all compaction data points (water content ω, dry density ρ d ) fell above the line of optimums.…”

Section: Discussionsupporting

confidence: 79%

“…For the cell 2 (west) liner, 26 hydraulic conductivity tests were performed (4.7 tests/ha) and these gave results very similar to those for cell 1, with a maximum value of 1.4 × 10 -8 cm/s, a geometric mean of 0.98 × 10 -8 cm/s, and a standard deviation (log 10 k) of 0.11. Thus, the quality of the cell 2 liner appears to be similar to that of cell 1 and the quality of the 15 ha of the liner constructed at the Halton Landfill between 1992 and 1998 appears to be similar to that obtained at the Keele Valley Landfill (King et al 1993).…”

Section: Recompacted Clayey Silt Till Linersupporting

confidence: 55%

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Design and construction of the barrier system for the Halton Landfill

Rowe¹,

Caers²,

Reynolds³

et al. 2000

Revue canadienne de géotechnique

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Considerations related to the design of the Halton Landfill as a "hydraulic trap" are summarized together with the research that was conducted to support the design concept. The interrelationship between hydrogeology and the engineered design is examined. Laboratory experiments demonstrated that there can be diffusion away from a source, even with significant inward velocity. Existing theory was found to provide a good prediction of the observed concentration profile in these experiments. It is also shown that a pressurized air pocket below the clay effectively acts as a zero-flux boundary and hence, with respect to migration of chloride, could be conservatively neglected in the impact assessment. The results of the impact calculations predict only a small increase in chloride concentration in the receptor aquifer while there is negligible predicted impact due to organic contaminants. The landfill was designed and constructed with a granular "sub-liner contingency layer" (SLCL) beneath the compacted liner. The operation of this layer is discussed. Finally, the construction of the compacted clayey liner with a hydraulic conductivity of 1 × 10 -8 cm/s is documented.Key words: landfill, hydraulic containment, liner, field case, construction.Résumé : On présente le résumé de considérations associées à la constructiion du site d'enfouissement de Halton conçu comme une « trappe hydraulique » de même que la recherche qui a été réalisée pour appuyer cette idée de conception. L'interrelation entre l'hydrogéologie et la conception de l'ouvrage est examinée. Des expériences en laboratoire ont montré qu'il peut y avoir de la diffusion s'éloignant de la source même avec une vélocité appréciable en direction de la source. On a trouvé que les théories existantes fournissent une bonne prédiction du profil de concentration observé dans ces expériences. On montre également qu'une poche d'air sous pression au-dessous de l'argile agit efficacement comme une barrière d'écoulement nul qui, en ce qui concerne la migration de chlorure, pourrait ainsi être négligé de façon sécuritaire dans l'évaluation environnementale. Les résultats des calculs d'impact prédisent seulement une faible augmentation de la concentration de chlorure dans l'aquifère récepteur et un impact négligeable des contaminants organiques. Le site d'enfouissement a été conçu et construit avec une couche granulaire de sécurité placée sous la membrane d'étanchéité (SLCL) d'argile compactée. On discute de l'opération de cette couche. Finalement, on présente des informations concernant la construction de la membrane d'étanchéité d'argile compactée ayant une conductivité hydraulique de 1 × 10 -8 cm/s.

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Section: Discussionsupporting

confidence: 79%

Section: Recompacted Clayey Silt Till Linersupporting

confidence: 55%

Design and construction of the barrier system for the Halton Landfill

Rowe¹,

Caers²,

Reynolds³

et al. 2000

Revue canadienne de géotechnique

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“…A case study of the Keele Valley Landfill reported in King et al [41] has been considered. The Keele Valley Landfill at Maple, Ontario, approximately 10 km north of Metropolitan Toronto, is owned and operated by the Municipality of Metropolitan Toronto Department of Works.…”

Section: Case Study 2: Keele Valley Landfillmentioning

confidence: 99%

Modelling of contaminant transport through landfill liners using EFGM

Kumar

Dodagoudar

2009

Num Anal Meth Geomechanics

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SUMMARYModelling of contaminant transport through landfill liners and natural soil deposits is an important area of research activity in geoenvironmental engineering. Conventional mesh-based numerical methods depend on mesh/grid size and element connectivity and possess some difficulties when dealing with advectiondominant transport problems. In the present investigation, an attempt has been made to provide a simple but sufficiently accurate methodology for numerical simulation of the two-dimensional contaminant transport through the saturated homogeneous porous media and landfill liners using element-free Galerkin method (EFGM). In the EFGM, an approximate solution is constructed entirely in terms of a set of nodes and no characterization of the interrelationship of the nodes is needed. The EFGM employs moving least-square approximants to approximate the function and uses the Lagrange multiplier method for imposing essential boundary conditions. The results of the EFGM are validated using experimental results. Analytical and finite element solutions are also used to compare the results of the EFGM. In order to test the practical applicability and performance of the EFGM, three case studies of contaminant transport through the landfill liners are presented. A good agreement is obtained between the results of the EFGM and the field investigation data.

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“…The migration of contaminants from solid waste landfills through both natural and compacted clay has been examined through several well documented case histories (Goodall and Quigley, 1977;Barone et al, 1991;King et al, 1993). In most cases, these low hydraulic conductivity natural clay deposits or compacted clay liners minimize the advective flux of contaminants through the clay resulting in diffusion becoming the dominant contaminant transport mechanism (for an exception, see Munro et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

The 14-year Performance of a Compacted Clay Liner used as Part of a Composite Liner System for a Leachate Lagoon

Lake

Rowe

2005

Geotech Geol Eng

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The migration of contaminants through a 2.9 m thick compacted clay liner (CCL) for a landfill leachate lagoon is examined 14 years after construction. The clay liner formed the lower portion of the composite liner system but the geomembrane (GM) was found to have defects that had allowed leachate to migrate between the GM and CCL. Chloride, sodium, potassium, calcium and magnesium pore water profiles through the CCL are examined. It is shown that chloride migrated approximately 1.7 m into the CCL during the 14 years of the lagoon operation, sodium approximately 1.2 m, and potassium 0.7 m. Diffusion and sorption data from laboratory diffusion testing are utilized in combination with a finite layer contaminant transport model to predict field contaminant migration profiles through the composite liner system and to establish the time of 'failure' of the geomembrane at sometime between 0 and 6 years after installation. Relatively high sorptive uptake of potassium by the CCL soil is observed from batch testing and diffusion testing with field data suggesting an even larger amount of sorption. It is hypothesized that organic sludge matter at the base of the lagoon is responsible for potassium uptake from the leachate. This field case highlights the importance of the compacted clay liner as part of the composite liner system in acting as a diffusion barrier during the lifetime of the lagoon as well as using relatively non-conservative contaminants such as chloride and sodium to estimate geomembrane 'failure' times.

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Hydraulic conductivity and diffusion monitoring of the Keele Valley Landfill liner, Maple, Ontario

Cited by 51 publications

References 5 publications

Design and construction of the barrier system for the Halton Landfill

Design and construction of the barrier system for the Halton Landfill

Modelling of contaminant transport through landfill liners using EFGM

The 14-year Performance of a Compacted Clay Liner used as Part of a Composite Liner System for a Leachate Lagoon

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