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2008-07-29_REPORT - C1981010
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2008-07-29_REPORT - C1981010
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Last modified
8/24/2016 3:35:03 PM
Creation date
7/30/2008 3:24:23 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
REPORT
Doc Date
7/29/2008
Doc Name
Semi-Annual Geotechnical Monitoring Report Review
From
DRMS
To
Trapper Mining Inc
Permit Index Doc Type
Reveg Monitoring Report
Email Name
JDM
Media Type
D
Archive
No
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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />July 29, 2008 <br />James Mattern <br />Trapper Mining, Inc <br />P.O. Box 187 <br />Craig, CO 81626 <br />RE: Trapper Mining, Inc., Permit C-81-010 <br />Semi-annual Geotechnical Monitoring Report <br />Dear Mr. Mattern, <br />COLORADO <br />D I V I S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />The Colorado Division of Reclamation, Mining, and Safety (CDRMS) has reviewed the above- <br />described Geotechnical Monitoring Report ("GMR") for the Trapper Mine, received by the Division <br />on 27 Mar 2008. The Report is to be submitted semi-annually, per the requirements of Technical <br />Revision No. 99 (TR-99) to Permit No. C-1980-010, incorporated into Section 3.3.3 of the application <br />as pages 3-27a, 3-27b, 3-27c and 3-27d. <br />1) Table 3.3-3 includes proposed lengths (in feet) for the three inclinometers and four piezometers <br />installed. These lengths differ from those reported in the GMR (some are longer; some are shorter). <br />Please provide an explanation of the variations in length of instrumentation between Table 3.3-3 <br />and the GMR. <br />2) Piezometer Data - The GMR cover letter (page 2) states that, "Piezometers inside the slide area <br />tend to have higher psi readings than those outside the slide area." The data presented for 07-GI3 <br />(inside the slide) are, indeed, higher than the measurements reported for 07-GX5 (outside the slide), <br />but the pore pressure readings for 07-GI 10 (also inside) are more similar to 07-GX5 than they are to <br />07-GI3. <br />Please reconsider the statement referenced above, and rephrase, if necessary. <br />3) Piezometer Data - Page 2 of the GMR cover letter states, "Readings from the Z pit piezometer <br />indicate insignificant amounts of pore pressure. This piezometer was inadvertently destroyed in <br />September and is currently inactive." The Piezometer Data spreadsheet reports zero value for pore <br />pressures in the Z pit piezometer (07-ZI2) prior to the date at which it was destroyed. <br />Please provide the data (f any) that were collected for 07-ZI2 prior to the time the piezometer was <br />destroyed. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines
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