35 Pa. Stat. § 6018.402
The Environmental Quality Board shall establish rules and regulations identifying the characteristics of hazardous wastes and listing particular hazardous wastes which shall be subject to the provisions of this act. The list promulgated shall in no event prevent the department from regulating other wastes, which, although not listed, the department has determined to be hazardous; the Department of Environmental Protection may regulate such hazardous wastes when the department has determined such waste poses a substantial present or potential hazard to the human health or the environment by any means including, but not limited to, issuance of orders and the imposition of terms and conditions of permits. The board shall identify the characteristics of hazardous wastes and list particular hazardous wastes within 30 days after the effective date of this section, which initial list shall not be subject to section 107 of this act but shall be promulgated in accordance with section 204(3) of the act of July 31, 1968 ( P.L. 769, No.240), referred to as the Commonwealth Documents Law.
35 P.S. § 6018.402