(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;

(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.