Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-351 - Criteria for municipal solid waste landfills
Section 173-351-450 - Alternate groundwater monitoring programs
Current through Register Vol. 24-06, March 15, 2024
(1) The owner or operator may propose changes and/or alternate groundwater monitoring programs for detection monitoring after the second year of groundwater monitoring under WAC 173-351-430(3), or the assessment monitoring program of WAC 173-351-440 as follows:
(2) All proposed changes in groundwater monitoring frequency must be no less than semiannually for detection monitoring and no less than quarterly for assessment monitoring. The owner or operator must apply for a permit modification under WAC 173-351-720(6) or must apply during the renewal process of WAC 173-351-720(5) for changes in groundwater monitoring frequency making a demonstration based on the following information:
(3) The owner or operator must apply for a permit modification under WAC 173-351-720(6) or must apply during the renewal process of WAC 173-351-720(5) for all proposed deletions or changes to groundwater monitoring constituents of Appendix I, II, and III based on all of the following information:
Verification that the removed constituents are not reasonably expected to be in or derived from the waste contained in the unit, by:
(4) Multiunit groundwater monitoring systems.
An owner or operator may propose during the permitting process of WAC 173-351-700 or through the permit modification process of WAC 173-351-720(6) a multiunit groundwater monitoring system instead of separate groundwater monitoring systems for each MSWLF unit, including MSWLF units which were closed in accordance with chapter173-351, 173-304, or 173-301 WAC. The multiunit system must meet all of the requirements of WAC 173-351-400 through WAC 173-351-490 and will be as protective of human health and environment as individual groundwater monitoring systems for each MSWLF unit. Permit approval for multiunit groundwater monitoring systems and programs will be based on the ability to provide early warning detection of any contaminant releases including:
Statutory Authority: RCW 70.95.020(3), 70.95.060(1), and 70.95.260(1), (6). 12-23-009 (Order 07-15), § 173-351-450, filed 11/8/12, effective 12/9/12. Statutory Authority: Chapter 70.95 RCW and 40 CFR 258. 93-22-016, § 173-351-450, filed 10/26/93, effective 11/26/93.