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Acid precipitation is a specific manifestation of the pollution resulting from our continued industrial growth and our increasing use of fossil fuels, and all aspects of this problem need further research. The following are specific areas that need to be addressed: O Monitoring of acidic precipitation should be continued and expanded as necessary to reach an accurate definition of the limits and intensity of acidic precipitation.-vii-Work on the definition of the mechanisms of transport, transformation, and deposition of pollutants should be expanded to consider all important precursor compounds, including NOx and HC as well as SOx. O Work should be undertaken to inventory the location and amount of precursor pollutants produced by all combustion sources that can be contributing to acid rain. Concurrent with the above activities a control strategy that considers all combustion sources, including motor vehicles and liquid fuels in boilers and furnaces as well as coal burning sources, should be developed.

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The 1984 Hazardous and Solid Waste Amendments (HSWA) of the Resource Conservation and Recovery Act (RCRA require that EPA either ban the disposal of hazardous wastes to the land or ascertain that such wastes are acceptable for land disposal. The soil and debris associated with the clean up of Superfund sites also fall under these statutes and must be addressed. A significant part of the regulatory strategy adopted by EPA Involved the determination of best demonstrated available technology for contaminated soils and debris. A series of soil treatment technologies that were considered as candidates for Superfund sites (physical, chemical, thermal solidification) were tested on a laboratory prepared feed sample and the waste product streams generated were processed by the Toxicity Characteristic Leaching Procedure (TCLP).The TCLP chemicals and mechanism have been compared to some of the most severe leaching conditions experienced in the land disposal of hazardous wastes, and therefore the results of these tests should simulate the worst case situations.