Current through Register Vol. 24-06, March 15, 2024
(1)
Applicability. The
requirements of this section apply to owners or operators who store munitions
and explosive dangerous wastes, except as WAC
173-303-600(3)
provides otherwise. (NOTE: Depending on explosive hazards, dangerous waste
munitions and explosives may also be managed in other types of storage units,
including containment buildings (WAC
173-303-695 ), tanks (WAC
173-303-640 ), or containers (WAC
173-303-630 ). See WAC
173-303-578(4)
for storage of waste military munitions.)
(2)
Design and operating
standards.
(a) Dangerous waste
munitions and explosives storage units must be designed and operated with
containment systems, controls, and monitoring, that:
(i) Minimize the potential for detonation or
other means of release of dangerous waste, dangerous constituents, dangerous
decomposition products, or contaminated runoff, to the soil, groundwater,
surface water, and atmosphere;
(ii)
Provide a primary barrier, which may be a container (including a shell) or
tank, designed to contain the dangerous waste;
(iii) For wastes stored outdoors, provide
that the waste and containers will not be in standing precipitation;
(iv) For liquid wastes, provide a secondary
containment system that assures that any released liquids are contained and
promptly detected and removed from the waste area, or vapor detection system
that assures that any released liquids or vapors are promptly detected and an
appropriate response taken (for example, additional containment, such as
overpacking, or removal from the waste area); and
(v) Provide monitoring and inspection
procedures that assure the controls and containment systems are working as
designed and that releases that may adversely impact human health or the
environment are not escaping from the unit.
(b) Dangerous waste munitions and explosives
stored in accordance with this section may be stored in one of the following:
(i) Earth-covered magazines. Earth-covered
magazines must be:
(A) Constructed of
waterproofed, reinforced concrete or structural steel arches, with steel doors
that are kept closed when not being accessed;
(B) Designed and constructed:
(I) To be of sufficient strength and
thickness to support the weight of any explosives or munitions stored and any
equipment used in the unit;
(II) To
provide working space for personnel and equipment in the unit; and
(III) To withstand movement activities that
occur in the unit; and
(C) Located and designed, with walls and
earthen covers that direct an explosion in the unit in a safe direction, so as
to minimize the propagation of an explosion to adjacent units and to minimize
other effects of any explosion.
(ii) Above-ground magazines. Above-ground
magazines must be located and designed so as to minimize the propagation of an
explosion to adjacent units and to minimize other effects of any
explosion.
(iii) Outdoor or open
storage areas. Outdoor or open storage areas must be located and designed so as
to minimize the propagation of an explosion to adjacent units and to minimize
other effects of any explosion.
(c) Dangerous waste munitions and explosives
must be stored in accordance with a standard operating procedure specifying
procedures to ensure safety, security, and environmental protection. If these
procedures serve the same purpose as the security and inspection requirements
of WAC 173-303-310, the preparedness and
prevention procedures of WAC
173-303-340, and the contingency
plan and emergency procedures requirements of WAC
173-303-350, then these
procedures will be used to fulfill those requirements.
(d) Dangerous waste munitions and explosives
must be packaged to ensure safety in handling and storage.
(e) Dangerous waste munitions and explosives
must be inventoried at least annually.
(f) Dangerous waste munitions and explosives
and their storage units must be inspected and monitored as necessary to ensure
explosives safety and to ensure that there is no migration of contaminants out
of the unit.
(3)
Closure and post-closure care.
(a) At closure of a magazine or unit that
stored dangerous waste in accordance with this section, the owner or operator
must remove or decontaminate all waste residues, contaminated containment
system components, contaminated subsoils, and structures and equipment
contaminated with waste, and manage them as dangerous waste. The closure plan,
closure activities, cost estimates for closure, and financial responsibility
for magazines or units must meet all of the requirements specified in WAC
173-303-610 and
173-303-620, except that the
owner or operator may defer closure of the unit as long as it remains in
service as a munitions or explosives magazine or storage unit.
(b) If, after removing or decontaminating all
residues and making all reasonable efforts to effect removal or decontamination
of contaminated components, subsoils, structures, and equipment as required in
(a) of this subsection, the owner or operator finds that not all contaminated
subsoils can be practicably removed or decontaminated, he or she must close the
facility and perform post-closure care in accordance with the closure and
post-closure requirements that apply to landfills (WAC
173-303-665(6)
).
Statutory Authority:
Chapters
70.105,
70.105D,
15.54 RCW and
RCW
70.105.007. 00-11-040 (Order 99-01), §
173-303-693, filed 5/10/00, effective
6/10/00.