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
Universal Citation: WY Code of Rules 6-8
Current through September 21, 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).
(d) Air: Air monitoring, if required, shall be conducted in accordance with Air Quality Division regulations.
(e) Soil core: Soil core monitoring, if required, shall be conducted in accordance with a plan approved by the Administrator.
(f) Vadose zone: Vadose zone monitoring, if required, shall be conducted in accordance with a plan approved by the Administrator.
Disclaimer: These regulations may not be the most recent version. Wyoming may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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