79. (1) No person shall dispose of characteristic waste by land disposal unless, before it is land disposed, the waste is treated in accordance with the following rules: 1.  Subject to paragraphs 3 and 4, the following rules apply in respect of each regulated constituent set out for the waste in Schedule 5 if the waste is an aqueous waste: i.  If Column 5 of Schedule 5 sets out one or more treatment codes as the land disposal treatment requirement for that regulated constituent of the waste, A.  the waste must be treated in accordance with Schedule 5 using the treatment methods set out for those treatment codes in Schedule 7, and B.  the treated waste resulting from each treatment method must meet the treatment standard set out for that method in Schedule 7. ii.  If Column 5 of Schedule 5 sets out a numerical concentration as the land disposal treatment requirement for that regulated constituent of the waste, the waste must be treated so that, based on an analysis of composite samples, the concentration of the regulated constituent in the treated waste is less than that concentration. iii.  If subparagraphs i and ii both apply, the waste only needs to be treated in accordance with one of those subparagraphs. iv.  If Column 5 of Schedule 5 contains the words “meet Schedule 6 standards” in respect of a land disposal treatment requirement for the waste and, on or after December 31, 2009, the waste is treated in accordance with that requirement, the waste must also be treated so that, based on an analysis of composite samples, the concentration in the treated waste of each regulated constituent listed in Schedule 6 is less than the concentration set out for that regulated constituent in Column 3 of Schedule 6. 2.  Subject to paragraphs 3 and 4, the following rules apply in respect of each regulated constituent set out for the waste in Schedule 5 if the waste is a non-aqueous waste: i.  If Column 6 of Schedule 5 sets out one or more treatment codes as the land disposal treatment requirement for that regulated constituent of the waste, A.  the waste must be treated in accordance with Schedule 5 using the treatment methods set out for those treatment codes in Schedule 7, and B.  the treated waste resulting from each treatment method must meet the treatment standard set out for that method in Schedule 7. ii.  If Column 6 of Schedule 5 sets out a numerical concentration as the land disposal treatment requirement for that regulated constituent of the waste, the waste must be treated so that, based on an analysis of grab samples, the concentration of the regulated constituent in the treated waste is less than that concentration. iii.  If subparagraphs i and ii both apply, the waste only needs to be treated in accordance with one of those subparagraphs. iv.  If Column 6 of Schedule 5 contains the words “meet Schedule 6 standards” in respect of a land disposal treatment requirement for the waste and, on or after December 31, 2009, the waste is treated in accordance with that requirement, the waste must also be treated so that, based on an analysis of grab samples, the concentration in the treated waste of each regulated constituent listed in Schedule 6 is less than the concentration set out for that regulated constituent in Column 4 of Schedule 6. v.  For the purpose of subparagraphs ii and iv, if the numerical concentration set out in Column 6 of Schedule 5 or Column 4 of Schedule 6 is expressed as a TCLP concentration, the concentration in the treated waste must be determined using the Toxicity Characteristic Leaching Procedure. 3.  If Column 5 or 6 of Schedule 5 contains the words “best efforts to achieve” in respect of a numerical concentration that is set out as the land disposal treatment requirement for that regulated constituent of the waste, it is not necessary for the concentration of the regulated constituent in the treated waste to be less than that concentration, but the person treating the waste must use the person’s best efforts to achieve that standard. 4.  If treatment subcategories are set out for the waste in Schedule 5, paragraphs 1 to 3 apply to the treatment subcategory that most closely describes the waste.  O. Reg. 461/05, s. 17. (2) Dilution may not be used to comply with subparagraph 1 ii or iv or 2 ii or iv of subsection (1).  O. Reg. 461/05, s. 17. (3) Nothing in this section requires further treatment for a regulated constituent of a waste if, (a)  treatment that is required for the waste by subsection (1) causes the concentration of the regulated constituent in the treated waste to increase; (b)  a numerical concentration is set out as the land disposal treatment requirement for that regulated constituent of the waste in, (i)  Column 5 of Schedule 5, if the waste is an aqueous waste, or (ii)  Column 6 of Schedule 5, if the waste is a non-aqueous waste; and (c)  the concentration of the regulated constituent in the untreated waste was less than the concentration referred to in clause (b).  O. Reg. 461/05, s. 17. (4) For the purpose of subsection (3), if the numerical concentration referred to in clause (3) (b) is expressed as a TCLP concentration, the concentration of the regulated constituent in the untreated waste and in the treated waste must be determined using the Toxicity Characteristic Leaching Procedure.  O. Reg. 461/05, s. 17. (5) Despite subsection (1), a person may dispose of characteristic waste by land disposal if the waste has been treated in a manner that the Director has approved in writing as equivalent to the treatment referred to in subsection (1).  O. Reg. 461/05, s. 17. (6) This section does not apply to a hazardous waste that is a characteristic waste and that is also a listed waste if all of the regulated constituents set out for the waste in Schedule 5 are regulated constituents set out for the waste in Schedule 1, Part A of Schedule 2, Part B of Schedule 2 or Schedule 3.  O. Reg. 461/05, s. 17. (7) Revoked: O. Reg. 297/17, s. 1.