Notwithstanding § 236.521(3) and (4) (relating to minimum requirements for classes of waste), liquid waste or waste containing liquid, shall be converted into a form that contains as little freestanding liquid as is reasonably achievable. The liquid may not exceed 1% of the volume of the waste when the waste is in a disposal container designed to ensure stability, or .5% of the volume of the waste for waste processed to a stable form.
25 Pa. Code § 236.523
This section cited in 25 Pa. Code § 236.522 (relating to stability requirements for waste form).