Oregon Administrative Rules › Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY › Division 94 - SOLID WASTE: MUNICIPAL SOLID WASTE LANDFILLS › Section 340-094-0120 - Closure Requirements

Current through Register Vol. 63, No. 7, July 1, 2024
If a municipal solid waste landfill is subject to
40 CFR,
				Part 258
as provided in
40 CFR, §
										258.1
, the owner or
				operator shall comply with closure and post-closure care requirements
				in
40 CFR, Part 258, Subpart F
. All municipal solid waste
				permittees shall also comply with this rule for any landfill that closes after
				January 1, 1980.
(1) When solid waste
			 is no longer received at a municipal solid waste landfill, the person who holds
			 or last held the permit issued underORS 459.205 or, if the person who holds or
			 last held the permit fails to comply with this section, the person owning or
			 controlling the property on which the landfill is located, shall close and
			 maintain the site according to the requirements of ORS Chapter 459, all
			 applicable rules adopted by the Commission underORS 459.045 and all
			 requirements imposed by the Department as a condition to renewing or issuing a
			 disposal site permit.
(2) Unless
			 otherwise approved or required in writing by the Department, no person shall
			 permanently close or abandon a municipal solid waste landfill, except in the
			 following manner:
(a) All areas containing
			 solid waste not already closed in a manner approved by the Department shall be
			 covered with at least three feet of compacted soil of a type approved by the
			 Department graded to a minimum two percent and maximum 30 percent slope unless
			 the Department authorizes a lesser depth or an alternative final cover design.
			 In applying this standard, the Department will consider the potential for
			 adverse impact from the disposal site on public health, safety or the
			 environment, and the ability for the permittee to generate the funds necessary
			 to comply with this standard before the disposal site closes. A permittee may
			 request that the Department approve a lesser depth of cover material or an
			 alternative final cover design based on the type of waste, climate, geological
			 setting, degree of environmental impact;
(b) Final cover material shall be applied to
			 each portion of a municipal solid waste landfill within 60 days after said
			 portion reaches approved maximum fill elevation, except in the event of
			 inclement weather, in which case final cover shall be applied as soon as
			 practicable;
(c) The finished
			 surface of the closed areas shall consist of soils of a type or types
			 consistent with the planned future use and approved by the Department. Unless
			 otherwise approved by the Department, a vegetative cover of native grasses
			 shall be promptly established over the finished surface of the closed
			 site;
(d) All surface water must be
			 diverted around the area of the disposal site used for waste disposal or in
			 some other way prevented from contacting the waste material;
(e) All systems required by the Department to
			 control or contain discharges to the environment must be completed and
			 operational.