2015-11-17_REVISION - C1982056

• Permit No: C1982056
• IBM Index Class Name: Revision
• Doc Date: 11/17/2015
• Doc Name: Midterm Review
• From: Tabetha Lynch
• To: Jared Ebert
• Type & Sequence: MT7
• Email Name: TNL
• Email Name: JLE
• Email Name: DIH
• Media Type: D
• Archive: No

Page 5
11/17/2015
4.05 Hydrologic Balance
4.05.2(1)-(2) Groundwater Protection:
Covered in Permit section 2.05.6(3) - Protection of the hydrological balance.
4.05.8(1)-(3) —Acid forming and Toxic forming Spoil:
Covered in Permit section 2.05.6(3) - Protection of the hydrological balance.
4.05. 10 Underground Mine Entry and Access Discharge
Covered in Permit section 2.05.6(3) - Protection of the hydrological balance.
4.05.11(1)-(2) Groundwater Protection
Covered in Permit section 2.05.6(3) - Protection of the hydrological balance.
4.05.12(1)-(3): Protection of Groundwater Recharge Capacity:
The section was adequately covered. Regional Recharge rates are provided in sections 2.04.7
(page 2.04-25.1) and 2.05.6 (3) (pg 2.05-141 ). Recharge Capacity protections are discussed in
Permit section 2.05.6(3) - Protection of the hydrological balance.
4.05.13(1): Groundwater Monitoring:
Groundwater monitoring plan can be found in Exhibit 14 and Exhibit 14A, Volume II -B of the
permit
Foidel Creek Mines groundwater points of compliance are as follows: 97013TM (Twentymile
Sandstone), 008-77-58 (Wadge overburden), 008-AU3 (Fish Creek alluvium), 008 -AT -1 (Trout Creek
alluvium), and 008 -AV -2 (Foidel Creek alluvium).
• It is not stated in the monitoring plan to what numeric standard the point of compliance wells are
required to meet. Table 9 Summary of Groundwater Rights shows Domestic use wells within the
POC monitored intervals. The Hydrologic Monitoring Plan needs to be updated to include the
required numeric standard for the Point of Compliance well Analysis Parameters. It is currently
not clear if the required numeric standard are to be meeting Domestic or Agricultural standards.
• Have the proposed wells WC008A and WC013A been installed (monitoring program exhibit
14A)? They are shown on Map 13A, but have not been acknowledged as current monitoring wells
in the monitoring plan.
• The 2014 AHR references potentiometric surfaces within the written interpretation of the data
and they are referenced within the permit related impacts to the hydrologic balance, however
these potentiometric surfaces are not currently being provided within the AHR. Due the potential
impacts from dewatering to the hydrologic balance, as well as the potential for increased aquifer