Risk Assessment and Feasibility of Remedial Alternatives for Coal Seam at Garrison, North Dakota Page: 3 of 300
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JV TASK 109 - RISK ASSESSMENT AND FEASIBILITY OF REMEDIAL ALTERNATIVES
FOR COAL SEAM AT GARRISON, NORTH DAKOTA
ABSTRACT
The Energy & Environmental Research Center (EERC) conducted an evaluation of
alternative technologies for remediation of hydrocarbon-contaminated coal seam, including
impacted soils and groundwater in Garrison, North Dakota. Geotechnical characteristics of the
impacted fractured coal seam provide for rapid off-site contaminant transport, with the currently
identified impacted zone covering an area of about 40 acres.
Regardless of the exposure mechanism (free, dissolved, or vapor phase), results of
laboratory tests confirmed secondary release of gasoline-based compounds from contaminated
coal to water reaching concentrations documented from the impacted areas. Coal laboratory
tests confirmed low risks associated with spontaneous ignition of gasoline-contaminated coal.
High contaminant recovery efficiency for the vacuum-enhanced recovery pilot tests
conducted at three selected locations confirmed its feasibility for full-scale remediation. A total of
3500 gallons (13.3 m3) of contaminated groundwater and over 430,000 ft3 (12,200 m3) of soil
vapor were extracted during vacuum-enhanced recovery testing conducted July 17-24, 2007,
resulting in the removal of about 1330 lb (603 kg) of hydrocarbons, an equivalent of about
213 gallons of product.
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Solc, Jarda. Risk Assessment and Feasibility of Remedial Alternatives for Coal Seam at Garrison, North Dakota, text, January 1, 2008; [Grand Forks, North Dakota]. (https://digital.library.unt.edu/ark:/67531/metadc895434/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.