Section 173-351-400 - Groundwater monitoring systems and remedial action(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; Note: | 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. |
(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.Wash. Admin. Code § 173-351-400
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.