Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0009 - Solid Waste Management › Chapter 6 - TRANSFER, TREATMENT, AND STORAGE FACILITY REGULATIONS › Section 6-8 - Monitoring Standards

Current through July 13, 2024
(a) General
				standards: All facilities required to institute monitoring shall meet the
				standards described in this section. The application shall include a detailed
				description of the environmental monitoring program including a description of
				the monitoring well location, design, construction and development. A
				description of the groundwater sampling program shall be provided including
				sampling frequency, test parameters, sampling procedures, test methods and
				quality control
(b) Collection and
				management of samples: Groundwater, soil, and decomposition gas samples shall
				be collected and managed in accordance with Department guidance or equivalent
				methods approved by the Administrator.
(c) Groundwater:
(i) Well placement: All facilities required
				to install monitoring wells shall locate and construct them in accordance with
				the Department's requirements. The system must be capable of monitoring the
				quality of background groundwater and groundwater passing the relevant point of
				compliance established by the Administrator that shall be within 150 meters
				(492 feet) of the waste management unit boundary on land owned by the owner of
				the facility.
(ii) Well design,
				construction/installation and abandonment: All wells shall be designed,
				constructed and installed in accordance with the Water Quality Division Chapter
				26 requirements. All abandoned monitoring wells shall be plugged and sealed in
				accordance with the Water Quality Division Chapter 26 requirements.
(iii) Detection monitoring: Operators
				required to monitor groundwater shall institute a detection monitoring program
				by initially collecting four (4) quarterly samples from each well and testing
				each sample for the constituents specified in Chapter 2, Appendix C unless
				alternate or additional constituents are required by the Administrator based on
				wastes managed at the facility. After collection of the initial four (4)
				samples, semiannual samples shall be collected unless the Administrator
				approves an alternate sampling frequency.
(A)
				The owner or operator must determine whether or not there is a statistically
				significant increase over background values as follows:
(I) The owner or operator must compare the
				groundwater quality of each parameter or constituent at each monitoring well
				using the approved statistical method; and
(II) Within thirty (30) days after completing
				sampling and analysis, unless an alternate time frame is approved by the
				Administrator, the owner or operator must determine whether there has been a
				statistically significant increase over background at each monitoring
				well.
(B) If there is a
				statistically significant increase over background for one or more constituents
				in any well the operator must:
(I) Notify the
				Administrator in a written report with supporting documentation and place a
				copy of the report in the facility operating record within fourteen (14)
				days.
(II) The owner or operator
				may be required by the Administrator to initiate an assessment monitoring
				program unless within ninety (90) days or an alternate time frame approved by
				the Administrator, the owner or operator demonstrates to the Administrator in
				writing that the statistically significant increase over background is not due
				to the solid waste facility or unit, but that the difference is due to another
				source of pollution, error in sampling, analysis or statistical evaluation, or
				natural variation in groundwater quality. The owner or operator shall prepare a
				report documenting this demonstration, and following approval by the
				Administrator, place the report in the operating record for the facility. If
				the demonstration is approved, the owner or operator shall continue detection
				monitoring.
(III) If a successful
				demonstration is not made:
(1.) The owner or
				operator shall request that the Administrator classify groundwater according to
				Wyoming Water Quality Rules and Regulations and establish groundwater
				protection standards for applicable constituents.
(iv) Assessment
				monitoring:
(A) If the concentration of one or
				more constituents exceeds background, the Administrator may require the
				operator to analyze groundwater samples for some or all of the constituents
				found in Chapter 2, Appendix A or B based on the wastes managed at the
				facility. Some or all of these constituents may be added to the detection
				and/or assessment monitoring program for the facility.
(B) After groundwater protection standards
				have been established, within thirty (30) days after completing sampling and
				analysis, unless an alternate time frame is approved by the Administrator, the
				owner or operator shall determine if there has been a statistically significant
				increase over a groundwater protection standard in each downgradient well
				specified by the Administrator using a statistical method approved by the
				Administrator.
(C) If one or more
				constituents are detected at statistically significant levels above the
				groundwater protection standard at a relevant point of compliance established
				by the Administrator that is no more than 150 meters (492 feet) from the waste
				management unit boundary on land owned by the owner of the facility, the owner
				or operator shall within fourteen (14) days notify the Administrator of the
				constituents detected above the groundwater protection standard in a written
				report with supporting documentation.
(D) Unless the owner or operator demonstrates
				that the statistically significant increase was caused by another source,
				resulted from an error in sampling, analysis, or statistical evaluation, or
				from natural variation in groundwater quality, the Administrator may require
				the owner or operator to characterize the nature and extent of the release,
				conduct an assessment of corrective measures, and institute corrective action
				remedies approved by the Administrator.
(v) Facilities required to monitor
				groundwater shall conduct statistical evaluations of groundwater data using the
				methods in Chapter 2, Section
				9(b)(i)(C)(V) through
				(VII).