6 CRR-NY 363-6.5NY-CRR
6 CRR-NY 363-6.5
6 CRR-NY 363-6.5
363-6.5 Landfill subgrade.
(a) The liner and leachate collection and removal system must be placed on a landfill subgrade that consists of an in-situ soil layer or select fill that is graded and prepared for landfill construction. A foundation-bearing capacity, stability and settlement analysis must be performed in accordance with section 363-4.3(b)-(d) of this Part.
(b) Materials required.
The landfill subgrade material must be free of visible organic material and consist of on-site soils, or select fill approved by the department. There must be a minimum thickness approved, pursuant to section 363-6.4 of this Part, below the landfill liner system consisting of low permeability soils with silty and clayey characteristics and which exhibit no large-scale, permeable deposits which could result in migration of contaminants off-site prior to detection and remediation.
(c) Construction requirements.
The subgrade must be sufficiently dry to allow for construction activities and structurally sound to ensure that the first lift and all succeeding lifts of soil placed over it can be adequately compacted to the design requirements and to ensure stability of the landfill.
(d) Certification requirements.
Before any material is placed over the landfill subgrade:
(1) the project engineer must inspect the exposed surface to evaluate the suitability of the subgrade and to ensure that the surface is properly compacted, smooth, and uniform, and must ensure that elevations are consistent with the department-approved drawings; and
(2) the subgrade must be tested for density and moisture content at a minimum frequency of nine tests per acre.
6 CRR-NY 363-6.5
Current through March 15, 2022
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