U.S.EPA - Ground-Water Issue. Characterizing soils for hazardous waste site assessments. March 1991 (PDF)
U.S.EPA - Ground-Water Issue. Behavior of metals in soils. October 1992 (PDF)
U.S.EPA - Ground-Water Issue. Natural attenuation of hexavalent chromium in groundwater and soils (PDF)
U.S.EPA - In situ treatment of soil and groundwater contaminated with chromium. Technical Resource Guide. October 2000 (HTML)
U.S.EPA SW 846 - Method 9080 Cation-exchange capacity of soils (ammonium acetate) (PDF)
U.S.EPA SW 846 - Method 9081 Cation-exchange capacity of soils (sodium acetate) (PDF)
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