The EPA has written regulations for many of the nation's pollution problems and has created permit situations for virtually all industrial sectors. Three areas under close scrutiny for concrete producers are: underground storage tanks, storm water pollution prevention plans, and control of process air discharges. The underground storage tank (UST) program has been implemented since 1988. Permit requirements specify that USTs must meet requirements for correct installation, spill and overfill prevention, and leak detection. Storm water regulations apply to any plant that discharges storm water via one or more point sources and/or into the waters of the United States, either directly or through a separate storm sewer system. The Prevention of Significant Deterioration (PSD) regulations apply to any major new stationary source or major modification to an existing major source located within an air quality attainment area. In a concrete plant, any equipment open to the atmosphere, such as an uncovered conveyor belt or dusty aggregate piles, could be considered a pollution source.