8 CAR § 60-524. Minimum design criteria

(a) Applicability. Unless provided otherwise, the requirements of this section as well as 8 CAR §§ 60-525 and 60-528 – 60-532 shall apply only to: (1) Newly permitted facilities; (2) Increases in the permitted capacity or disposal area; or (3) Permit renewals as specified in 8 CAR § 60-309. (b) Consideration of waste characteristics. (1) Landfills shall be subject to design and operational requirements dependent on the volume and physical, chemical, and biological nature of the wastes. (2) Design requirements shall also be dependent upon the geotechnical and hydrogeological characteristics of the site and surrounding locale. (3) The design proposed by the applicant in conformance with the criteria set forth herein shall be supported by complete hydrogeological and waste characterization data. (c) Ground water monitoring required. (1) In accordance with 8 CAR § 60-523, a facility or practice shall be designed to prevent the contamination of an underground drinking water beyond the solid waste boundary or beyond an alternative boundary specified in accordance with 8 CAR § 60-523(b). (2) Except as provided in subdivision (f)(3) of this section and 8 CAR § 60-621(e), ground water monitoring shall be required to confirm that ground water standards contained in Appendix 3 or as otherwise established under Subpart 12 of this part are achieved. (d) Site characteristics. The site and waste characterization requirements of Subpart 11 of this part shall be met for all new units and expansions of the permitted disposal area. (e) Liner design criteria for Class 3 commercial landfills. New Class 3 commercial landfills and expansions to the area permitted for waste disposal shall meet the design requirements set forth in 8 CAR §§ 60-424 – 60-432. (f) Liner design criteria for Class 3 noncommercial landfills. At a minimum, new Class 3 noncommercial landfills and expansions of the permitted fill area shall be constructed: (1) With a compacted clay liner of at least a two-foot thickness with a hydraulic conductivity of no more than 1 x 10-7 cm/sec and a leachate collection system that is designed and constructed to maintain less than a thirty-cm depth of leachate over the liner; or (2)(A) In accordance with a design approved by the Director of the Division of Environmental Quality. (B) The design must ensure that the concentration values specified in Appendix 3 will not be exceeded in the uppermost aquifer at the relevant point of compliance, as specified by the director under 8 CAR § 60-523. (3) Class 3 applicants proposing to fill only Class 4 type wastes as defined in this part may design and operate to the standards set forth in Subpart 6 of this part.