Soil impacts from crude oil spills in the United States are regulated at the state level using the analytical group total petroleum hydrocarbons (TPH) as the primary regulatory metric. TPH concentration in soil is used to enforce and verify compliance with cleanup levels (CULs). While there are significant differences between states concerning TPH CULs based on land use, most states enforce an action level of 100 mg TPH kg⁻1.
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- Masters Thesis Civil, Environmental and Sustainable Engineering 2020