2008-09-15_REVISION - C1982056 ‎(2)‎

• Permit No: C1982056
• IBM Index Class Name: REVISION
• Doc Date: 9/15/2008
• Doc Name: Review Memo
• From: Marcia
• To: Janet
• Type & Sequence: TR61
• Email Name: JHB
• Media Type: D
• Archive: No

Binns, Janet
From: Talvitie, Marcia
Sent: Monday, September 15, 2008 1:37 PM
To: Binns, Janet
Subject: RE: Twentymile Coal Company - Foidel Creek Mine (C-82-056), TR07-61 - 61VIN Reservoir Supplemental
Stability Analysis
Janet,
The static and seismic factors of safety as calculated are acceptable in accordance with rule 4.05.9(8). Please let me know
if you have any additional questions.
Marcia
Marcia L. Talvitie, P.E.
Environmental Protection Specialist
DRMS Durango Field Office - Coal Program
Phone. [phone]
Fax: [phone]
From: Binns, Janet
Sent: Thursday, September 11, 2008 5:08 PM
To: Talvitie, Marcia
Cc: Hernandez, Daniel; Brown, Sandy
Subject: FW: Twentymile Coal Company - Foidel Creek Mine (C-82-056), TR07-61 - 61VIN Reservoir Supplemental Stability
Analysis
Marcia,
Please find the 61VIN revised impoundment stability study that we spoke about earlier today. Please review and let me
know if the static factor of safety and seismic factor of safety are acceptable and the assumptions used in the calculations
are acceptable in accordance with rule 4.05.9(8).
Thank you for your assistance
Janet Binns
Environmental Protection Specialist II
Colorado Division of Reclamation, Mining and Saftey
[phone]
From: Nettleton, Jerry [mailto:[e-mail]]
Sent: Thursday, September 11, 2008 9:58 AM
To: Binns, Janet
Subject: Twentymile Coal Company - Foidel Creek Mine (C-82-056), TR07-61 - 61VIN Reservoir Supplemental Stability
Analysis
Janet -
Attached is the requested supplemental stability analysis for the 61VIN Reservoir. Hopefully, this addresses the remaining
outstanding issue, and we can move forward with final approval and construction. Thanks for your help -
Best regards,
911612008