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Rodriguez, Mary <br />From: <br />Talvitie, Marcia <br />Sent: <br />Thursday, May 10, 2012 1:17 PM <br />To: <br />Ebert, Jared <br />Cc: <br />DRMS - Coal - Admin; Brown, Sandy <br />Subject: <br />Review of Trapper Semi - Annual Geotechnical Monitoring Report <br />Hello, Jared <br />As requested in your April 16, 2012 email, I reviewed Trapper Mining, Inc.'s (TMI's) March 2012 Semi - Annual <br />Geotechnical Monitoring Report (GMR) for the Trapper Mine (Permit No. C- 1981 -010). <br />Instrumentation located at four stations (5, 6, 7 and 8) collects data on a continual basis. The graphical presentation of <br />the data here is somewhat modified from that provided with previous GMR submittals. TMI's cover letter explains that <br />a different software is now being used to download and analyze the data. <br />I have only one comment regarding the information contained in the March 2012 GMR: For the piezometers at Station <br />IN -8, the pressures recorded at the "M" level (blue line) are lower than the pressures reported for the "L" level. Table 1 <br />from the September 2011 GMR gives depths of 142 feet and 59 feet for the IN -8 piezometers. Presumably the M <br />installation is the deeper of the two, which should result in higher pore pressures being measured for that piezometer. <br />Please ask TMI to review the piezometer data for IN -8 and revise if appropriate. <br />Let me know if you have any questions about my review. <br />Marcia <br />Marcia L. Talvitie, P.E. <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Durango Field Office <br />691 CR 233, Suite A -2 <br />Durango, Colorado 81301 <br />(970) 247 -1184 <br />