d und

Groundwater treatment cont'd. Biological treatment

Precipitation, flocculation, sedimentation Dissolved air flotation Granular media filtration Ion-exchange resin adsorption Oxidation-reduction Neutralization Steam stripping Reverse osmosis Sludge dewatering Vapor migration control, collection, and treatment

Passive collection systems Active collection systems Ventilation of structures Adsorption Flaring

Surface water and drainage controls Diversion and collection systems Grading Capping Revegetation Restoration of contaminated water supplies and sewer lines

Alternative central water supplies Alternative point-of-use water supplies Treatment of central water supplies Treatment of point-of-use water supplies Replacement of water and sewer lines Cleaning and restoration of water and sewer lines

Note: Technologies in italics are likely to be used in response to UST releases at gasoline stations.

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