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Analysis of the distribution of inorganic constituents in a landfill leachate-contaminated aquifer: Astrolabe Park, Sydney, Australia

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Environmental Geology

Abstract

An investigation was conducted at Astrolabe Park landfill, a decommissioned municipal landfill in Sydney, Australia, to assess the physical and chemical processes affecting the distribution of inorganic constituents in the leachate plume. The plume is migrating from the landfill towards a groundwater-fed pond into which leachate-impacted groundwater discharges. Borehole geophysical logging and depth-discrete groundwater sampling were used to delineate the distribution of the leachate plume along two groundwater flow paths between the landfill and the shore of the pond. Borehole geophysical logs indicate a strong correlation between bulk and fluid electrical conductivity (EC) values, and help to identify small-scale heterogeneities that comprise a major constraint on contaminant transport within the aquifer. Variations in the distribution of several indicator parameters (EC, HCO3 −, pH, Eh, NH4 +/NO3 −, S2−/SO4 2−) are used to assess the dominant processes affecting contaminant distribution along the flow path, including mixing of fresh and contaminated groundwater, oxidation/reduction reactions and ion exchange.

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Acknowledgements

This research was made possible through the financial assistance of Sydney Water. The authors thank Karina Morgan, Bethany O’Shea, Sarah Groves and Wendy McLean for their assistance during sample collection and Dorothy Yu for her help with chemical analysis in the laboratory.

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Authors and Affiliations

  1. UNSW Groundwater Group, School of Biological, Earth and Environmental Sciences, University of New South Wales, 2052, Sydney, N.S.W., Australia

    L. B. Jorstad & J. Jankowski

  2. UNSW Groundwater Group, School of Civil and Environmental Engineering, Water Research Laboratory, King Street, 2093, Manly Vale, N.S.W., Australia

    R. I. Acworth

Authors
  1. L. B. Jorstad
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  2. J. Jankowski
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  3. R. I. Acworth
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Correspondence to L. B. Jorstad.

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Jorstad, L.B., Jankowski, J. & Acworth, R.I. Analysis of the distribution of inorganic constituents in a landfill leachate-contaminated aquifer: Astrolabe Park, Sydney, Australia. Env Geol 46, 263–272 (2004). https://doi.org/10.1007/s00254-004-0978-3

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  • DOI: https://doi.org/10.1007/s00254-004-0978-3

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