STP1240

    In Situ Solidification/Stabilization Pilot Study for the Treatment of Coal Tar Contaminated Soils and River Sediments

    Published: Jan 1996


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    Abstract

    Coal tar contamination was encountered at a former coal gasification site in soils below the groundwater table, and in the sediments of the adjacent river. Ex situ remediation techniques at this site would be costly because of the need to dewater the impacted media. In situ solidification/stabilization was tested to evaluate its effectiveness. Treatability testing was performed to evaluate a Portland cement/fly ash binder system with added stabilizing agents. Results were sufficiently promising to warrant pilot testing.

    Grout containing Portland cement, fly ash, organically modified clay, and granular activated carbon was pilot tested at the site. Test specimens were collected and tested to evaluate durability, compressive strength, and permeability. The samples were extracted by several methods and analyzed to measure the leachable concentrations of organic compounds and metals. Results indicated acceptable physical characteristics. Leachable concentrations of most polynuclear aromatic compounds were decreased.

    Keywords:

    in situ, stabilization and solidification, coal tar, soil, sediments, pilot study, Portland cement, pozzolan, organophilic clay


    Author Information:

    Lawson, MA
    Senior Project Engineer, Project Manager, and Director of Engineering, WW Engineering & Science, Grand Rapids, MI

    Venn, JG
    Senior Project Engineer, Project Manager, and Director of Engineering, WW Engineering & Science, Grand Rapids, MI

    Pugh, LB
    Senior Project Engineer, Project Manager, and Director of Engineering, WW Engineering & Science, Grand Rapids, MI

    Vallis, T
    Vice President, Wisconsin Fuel & Light Co., Manitowoc, WI


    Paper ID: STP14146S

    Committee/Subcommittee: D34.01

    DOI: 10.1520/STP14146S


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