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In specific operating regions, Aggregate Industries recycles petroleum contaminated soils into viable, safe construction materials. Each facility is fully permitted by the state and local authorities. Soils contaminated with gasoline, fuel oil or other petroleum products are accepted for recycling only after thorough testing determines that the materials are classified as non-hazardous and therefore amenable to the recycling process. Two methods, encapsulation and bio-remediation, are used to convert these soils into environmentally safe products for use as construction base or as soil cover for landfills. The encapsulation process utilizes commercial emulsions to bind the petroleum materials thereby preventing further migration while bio-remediation uses natural occurring microbes to break down the petroleum into inert soil substances.