Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-304 - Minimum functional standards for solid waste handling
Section 173-304-462 - Woodwaste landfilling facility requirements
Universal Citation: WA Admin Code 173-304-462
Current through Register Vol. 24-06, March 15, 2024
(1) Applicability. These requirements apply to facilities that landfill more than two thousand cubic yards of woodwaste including facilities that use woodwaste as a component of fill. Woodwaste is defined in WAC 173-304-100. These standards are not applicable to woodwaste landfills on forest lands regulated under the Forest Practices Act, chapter 76.09 RCW.
(2) Minimum functional standards.
(a) Woodwaste landfills are not subject to
WAC 173-304-130 standards, Locational
standards for disposal sites, except for WAC
173-304-130(2)(e)
surface water locational standards and WAC
173-304-130(2)(b)(iii)
down gradient drinking water supply wells.
Woodwastes may be used as a component of fill within a shoreline and associated
wetlands only if a demonstrated and proven technology to prevent ground and
surface water contamination is used.
(b) Owners or operators of woodwaste
landfills shall maintain a record of the weights or volumes of waste disposed
of at each facility.
(c) Owners or
operators of woodwaste landfills shall not accept any other wastes except
woodwaste.
(d) Owners or operators
of woodwaste landfills shall prevent run-on from a maximum twenty-five year
storm.
(e) All wood waste landfills
having a capacity of greater than ten thousand cubic yards at closure shall
either:
(i) Have a groundwater monitoring
system that complies with WAC
173-304-490 and the woodwaste
landfill meet the performance standards of WAC
173-304-460(2);
or
(ii) Have a leachate collection
and treatment system.
(f) Owners or operators of woodwaste
landfills shall not deposit woodwaste in lifts to a height of more than ten
feet per lift with at least one foot of cover material between lifts to avoid
hot spots and fires in the summer and to avoid excessive build-up of leachate
in the winter, and shall compact woodwaste as necessary to prevent
voids.
(g) Owners or operators of
woodwaste landfills shall prevent unauthorized disposal during off-hours by
controlling entry (i.e., lockable gate or barrier), when the facility is not
being used.
(h) Owners or operators
of woodwaste landfills shall close the facility by leveling and compacting the
wastes and applying a compacted soil cover of at least two feet
thickness.
(i) Owners or operators
of woodwaste landfills shall obtain a permit as set forth in WAC
173-304-600 from the
jurisdictional health department.
Statutory Authority: Chapter 43.21A RCW. 85-22-013 (Order 85-18), § 173-304-462, filed 10/28/85.
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