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by a state or national ambient air quality standard (except carbon monoxide, for which the limits are 250 lbs/hr and 2, 500 lbs/day) . The New Source Review Rule requires that for non-attainment pollu- tants, the new source must obtain a trade-off with an existing stationary sources within the same air basin. Trade-offs are ob- tained through negotiations and must result in sufficient emission reduction so that the total quantity of specified pollutants is less than it would be without the new source. EPA and State agencies hope that this approach will prove effective in reducing overall emissions without unduly constraining necessary development. For those pollutants considered in attainment with air quality standards, best available technology is required as long as the new source will not cause a violation of, or interfere with, the attainment or maintenance of ambient air quality standards. An exemption from the New Source Review Rule is possible for a facility which represents a significant advance in the development of a technology offering environmental or public health benefits . The EPA has issued a ruling to permit construction under this ex- emption of energy-from-waste recovery facilities that meet indi- vidual plant emission control requirements even though they might cause or contribute to violations of ambient air quality standards. Plant owners would have to show continuing good faith efforts to offset pollution from other sources in the same area. In addition, the State Air Resources Board has proposed the estab- lishment of pollution credit banks within each APCD. New sources other than resource recovery and cc-generation projects would be required to contribute to these banks when seeking permit clearance. Resource recovery and co-generation projects could then draw from these banks in lieu of attaining trade-offs themselves . The Air Resources Board is planning a pilot program in the South Coast Air Basin. r Most equipment suppliers claim that their systems can meet Federal and State air emission standards. Because California APCD' s use test methods that are different from EPA's, test data derived through EPA methods and interpretations cannot readily be used. There is no correlation method allowing conversion of the results of one method to the other. The State Solid Waste Management Board is pursuing a policy of funding air emission testing in an effort to generate data appli- cable to California. Tests are being conducted on two package - incinerator units (manufactured by Consumat Systems, Inc. , and Kelley Company) . Preliminary results indicate that these units can meet regulation if equipped with proper air pollution control equipment. Water Usage Generating steam requires the continuous use of water. For every 1, 000 pounds of steam produced, 120 gallons of water are needed. - 37 -