Section Env-Sw 805.03 - Landfill Subgrade and Base Grade Standards(a) The landfill subgrade shall be graded and prepared for landfill construction.(b) Subgrade materials shall have a saturated hydraulic conductivity of 1 x 10-4 centimeters per second (cm/sec) or less.(c) The subgrade shall have sufficient structural integrity to support the facility under all anticipated loading conditions during all phases of construction, operation and closure.(d) Engineering measures shall be incorporated in the design when necessary to ensure stability of the landfill during all phases of construction, operation and closure.(e) A stability analysis shall be submitted with the application to demonstrate compliance with requirements in (c) above and to support the facility design, including measures incorporated pursuant to (d) above, if any.(f) For geomembrane lined facilities, the subgrade below the liner shall: (1) Be prepared to a depth which provides a uniform and consistent bedding layer which shall be stable under loading;(2) Contain no stones greater than one inch in diameter, and no sharp or angular materials; and(3) Be compacted to 95% of the maximum dry density as determined by ASTM International (ASTM) D 698-12 (Standard Effort) or ASTM D 1557-12 (Modified Effort).(g) Facility base grades shall be sloped to facilitate compliance with Env-Sw 805.06 and Env-Sw 806.05.N.H. Admin. Code § Env-Sw 805.03
#5172, eff 7-1-91; ss by #6535, INTERIM, eff 7-1-97, EXPIRES: 10-29-97; ss by #6619-B, eff 10-29-97; (See Revision Note at chapter heading for Env-Sw 800) ss by #8459, eff 10-28-05 (formerly Env-Wm 2505.03 )
Amended byVolume XXXIV Number 24, Filed June 12, 2014, Proposed by #10597, Effective 7/1/2014, Expires7/1/2024.