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ISOLUTE EPH Columns have been developed to fractionate pentane or hexane based soil extracts into aliphatic and aromatic hydrocarbon fractions (C8 - C40 aliphatics, C10 - C22 aromatics). The columns consist of a proprietary blend of silica/alumina that has been optimized to achieve a clean fractionation of the aliphatic/aromatic EPH components. ISOLUTE EPH columns have been designed to eliminate the common problem of aromatic breakthrough into the aliphatic fraction. This approach is broadly based on procedures published by the Massachusetts Dept of Environmental Protection (MADEP) and the TPH Criteria Working Group (TPHCWG).