After much study, EPA has decided against changing its current RCRA Subtitle D rules affecting the state regulation of oil and gas exploration & production waste. Since 1988, EPA has determined that most such wastes should be regulated as only non-hazardous wastes subject to RCRA Subtitle D, and not the more onerous hazardous waste provisions of RCRA Subtitle C. (See the Regulatory Determination of Oil and Gas and Geothermal Exploration, Development and Production Wastes, 53 FR 25,446 (July 6,1988).)