18 AAC 60.320. Fault areas, seismic impact zones, and unstable areas

(a) A new Class I MSWLF or a lateral expansion of an existing Class I MSWLF may not be located

(1) within 200 feet of a fault visible at the surface or shown on a published topographical or geological map, that has had displacement in Holocene time, unless the owner or operator demonstrates that an alternative setback distance of less than 200 feet will prevent damage to the structural integrity of the MSWLF and will protect public health and the environment; or

(2) in a seismic impact zone, unless the owner or operator demonstrates that all containment structures, including liners, leachate collection systems, and surface water control systems, are designed to resist the maximum horizontal acceleration in the lithified earth material for the site, as affected by site conditions, so that the landfill will continue to control pollution.

(b) The owner or operator of a new or existing MSWLF or a lateral expansion located in an unstable area shall demonstrate that engineering measures have been incorporated into the MSWLF's design to ensure that the integrity of the structural components of the MSWLF will not be disrupted. The owner or operator shall consider, at a minimum, the following factors to determine whether an area is unstable:

(1) known onsite or local soil conditions that more likely than not will result in differential settling or ground failure under static conditions during an earthquake;

(2) known onsite or local geologic or geomorphologic features that pose a potential risk to the integrity of containment structures; and

(3) known onsite or local human-made surface and subsurface features or events.

History: Eff. 1/28/96, Register 137; am 10/29/98, Register 148

Authority: AS 44.46.020

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