2005-04-12_GENERAL DOCUMENTS - M1999002

• Permit No: M1999002
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Date: 4/12/2005
• Doc Name: Major modification
• From: US Environmental Protection Agenty
• To: American Soda L.L.P.
• Email Name: CBM
• Media Type: D
• Archive: No

collected five (5) quarters of baseline data, prior to the commencement of
operations, for the Alluvial Aquifer, the Upper Aquifer (A-Groove and Uinta
Formation), and the Lower Aquifer (B-Groove and Dissolution Surface).
Additional monitoring wells maybe deleted or added to the monitoring program,
if necessary, as development of the commercial solution mining well field
progresses, or as warranted by monitoring results. This will be done by modifying
the Water Monitoring Plan (see Section D. 4`h paragraph of Permit).
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C. WELL OPERATION
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3. Injection Zone and Injection Interval. The Injection Zone extends from the
base of the R 6 zone down to approximately 800 feet below the Dissolution
Surface. The Injection Zone includes the Dissolution Aquifer which
immediately underlies the R-6 zone. The Aquifer immediately overlying the
Dissolution Surface and underlying the R-6 zone does not generally meet USDW
standards within the mining area. The Injection Zone is separated from overlying
USDWs by the R-6 zone.
The Infection Interval is contained within the Injection Zone. The Injection
Interval equates to the mining zone and is required to be a minimum of 150
feet below the Dissolution Surface to approximately 800 feet below the
Dissolution Surface. The Injection Interval (approximately 1,550 feet to 2,200
feet in depth at a surface elevation of about 6,230 feet M.S.L.) is outside of and
isolated from overlying aquifer systems. The Injection Interval lies within the
Saline Zone, in the lower portion of the Parachute Creek Member, which is the
uppermost member of the four members that make up the Green River Formation.
All injection of fluids for the purpose of mining shall occur only within the
Injection Interval. However, the influence of injection fluid is allowed within
the entire Injection Zone. The permittee is required to monitor ground-water
aquifer conditions in accordance with the Water Monitoring Plan (Appendix 1) to
ensure that mining fluids do not migrate out of the Injection Zone. In addition to
the requirements of the Water Monitoring Plan, American Soda shall convert up
to six (6) mining wells to dissolution surface pressure-monitoring wells to
enhance monitoring within the injection zone as mining progresses within a
mining panel. Therefore, EPA is requiring the following actions.
o Within 90 days of the permanent retirement of any production well (not
including temporary suspension as discussed in Section G), the permittee
shall notify the Director of its intention to plug and abandon the well in
accordance with Section II E (1) of this permit or to convert the well to an
additional monitoring well (conversion notice).
FINAL: Modification No. 9, UIC Area Permit No. C030858-00000
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