HYDRO28482

• Permit No: M1999002
• IBM Index Class Name: Hydrology
• Doc Date: 2/9/2000
• Doc Name: FINAL AREA PERMIT VIC ISSUED TO AM SODA P 1-82
• Media Type: D
• Archive: No

•

consultation with other regulatory agencies.
The Permittee will monitor a network of 25 monitoring well
completions for the 0-5 year mine panel. Some of the
monitoring well completions are grouped together as nested
or co-located monitoring wells for the Uinta Formation, A-
Groove, B-Groove, and Dissolution Surface. The Upper
Aquifer will be monitored at twelve (12) locations, the
Lower Aquifer will be monitored at nine (9) locations, and
the Alluvial Aquifer will be monitored at four (4)
locations.
The monitoring wells for the initial five (5) year panel are
positioned up-gradient, down-gradient, and cross-gradient of
the mine panel. The monitoring well layout for the Yankee
Gulch lease site is shown in Appendix I, along with the well
summary of the Final Ground Water Monitoring Plan (dated
December 23, 1999) as presented in Table 1.
If the EPA, using best professional judgement and following
standard review practices, determines that the ground water
quality in the aquifers overlying the dissolution surface
has degraded from the baseline quality the Permittee may be
required to investigate. Methods of investigation may
include, but not be limited to, additional monitoring at
ground water monitoring wells, mechanical integrity testing
of UIC wells, geophysical surveys and review of records.
The Permittee is required to establish surface subsidence
monuments, including the initial 24 (twenty-four) wells, by
the Subsidence Monitoring Plan. EPA requires American Soda
to submit this data in their fourth quarter reports. In
order to establish a clear link between the UIC Permit and
the activities listed in the Fourth Revision of the
Subsidence Monitoringx Plan dated December 23, 1999, EPA has
adopted this Plan as Appendix J of this Permit. This
subsidence plan may be changed based on the results of the
monitoring data and the studies to be carried out regarding
technology to determine the shape of the cavities. Changes
of the Subsidence Monitoring Plan will be made by modifying
Appendix J of the Permit.
1. Solution Minino Well Field Monitoring Prooram. The
monitoring requirements for Class III wells are
specified in 40 CFR § 146.33. Samples and measurements
shall be representative of the monitored activity. The
Permittee shall utilize the applicable analytical
EPA FINAL Area Permit No. C03858-00000
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