Current through Register Vol. 24-06, March 15, 2024
(1) Applicability.
(a) The requirements of WAC
173-351-400 through WAC
173-351-490 apply to MSWLF units
whose owners and operators are required to perform groundwater monitoring under
chapter 173-351 WAC.
(b) Owners and
operators of MSWLF units must comply with the groundwater monitoring
requirements of this regulation according to the following schedule:
(i) Existing MSWLF units and lateral
expansions less than one mile (1.6 kilometers) from a drinking water intake
(surface or subsurface) must be in compliance with the groundwater monitoring
requirements specified in WAC
173-351-400 through
173-351-450, and
173-351-490 by October 9, 1994;
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Note:
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A drinking water intake is any surface water or
groundwater intake that is used for the purposes of drinking water i.e., water
supply wells.
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(ii)
Existing MSWLF units and lateral expansions greater than one mile (1.6
kilometers) from a drinking water intake (surface or subsurface) must be in
compliance with the groundwater monitoring requirements specified in WAC
173-351-400 through
173-351-450, and
173-351-490 by October 9,
1995;
(iii) New MSWLF units and
lateral expansions must be in compliance with the groundwater monitoring
requirements specified in WAC
173-351-400 through
173-351-450, and
173-351-490 before waste can be
placed in the MSWLF unit.
(c) Existing MSWLF units and lateral
expansions with groundwater contamination as defined under WAC
173-304-100 and chapter 173-200
WAC must begin an assessment groundwater monitoring program under WAC
173-351-440 by October 9,
1994.
(d) Interim groundwater
monitoring programs. Prior to the compliance schedules in (b) of this
subsection, all existing MSWLF units and lateral expansions must either:
(i) Continue to monitor under WAC
173-304-490; or
(ii) Begin to monitor under this
section.
(e) All MSWLF
units closed in accordance with chapter 173-304 WAC must continue to monitor
groundwater in accordance with chapter 173-304 WAC.
(2) The following reports, demonstrations and
information must be prepared by a geologist or other licensed professional in
accordance with the requirements of chapter 18.220 RCW, Geologists:
(a) The hydrogeologic report(s) of WAC
173-351-490;
(b) The groundwater monitoring program(s)
including the groundwater monitoring system design and well placement of WAC
173-351-405; the groundwater
sampling and analysis plan of WAC
173-351-410; the detection
monitoring program(s) of WAC
173-351-430; and the assessment
monitoring program(s) of WAC
173-351-440;
(c) Any demonstration(s) under WAC
173-351-430(4)(c),
173-351-440(6)(e),
173-351-140(1),
or 173-351-300(7);
(d) Any modification(s) proposals/requests to
the approved groundwater monitoring program in accordance with WAC
173-351-450;
(e) Any groundwater modeling demonstrations
made under WAC
173-351-480; and
(f) The groundwater reports required under
WAC 173-351-415.
Statutory Authority:
RCW
70.95.020(3),
70.95.060(1), and
70.95.260(1),
(6). 12-23-009 (Order 07-15), §
173-351-400, filed 11/8/12, effective 12/9/12. Statutory Authority:
Chapter
70.95 RCW and 40 CFR 258.
93-22-016, § 173-351-400, filed 10/26/93, effective
11/26/93.
