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REV08926
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REV08926
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Entry Properties
Last modified
8/25/2016 1:09:27 AM
Creation date
11/21/2007 9:58:01 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
Revision
Doc Date
1/4/1993
Doc Name
EDNA MINE C-80-001 TR 20 PRELIMINARY ADEQUACY REVIEW
From
DMG
To
PITTSBURG & MIDWAY COAL MINING CO
Type & Sequence
TR20
Media Type
D
Archive
No
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III IIIIIIIIIIIII III <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone: 13031866-3567 <br />FAX: X3031812-8106 <br />January 04, 1993 <br />Susan Hoffineister <br />Pittsburg & Midway Coal Mining Company <br />6400 South Fiddler's Green Circle <br />Englewood, Colorado 80111-4991 <br />RE: Edna Mine (C-80-001) <br />Technical Revision 20 <br />Preliminary Adequacy Review <br />Dear Ms. Hoffineister: <br />pF COQ <br />aQ' 9 <br />~c~grC~~y <br />~. ~~~ <br />~e~c <br />Roy Romer <br />Governor <br />Michael B. Long <br />Division Director <br />The Division has completed a preliminary adequacy review of the materials submitted with your <br />application for the above mentioned technical revision, Following are the Division's comments <br />concerning the application. <br />1. The Division requested that P&M update Section 2.5.3 of the Edna permit to <br />incorporate results of hydrologic monitoring since 1981 into the analysis and predictions <br />in the permit. P&M submitted Appendix 2.5-A to update monitoring results and <br />predictions in Section 2.5.3, The Division has the following comments regarding that <br />information. <br />a. Section I, Comparisons, should include a statement to clarify that TDS values <br />reported prior to 1992 were derived using regression analysis equations. Please <br />clarify whether reported values were analytical results, were derived from the <br />equation on page 2.5-95, or were derived from the equation on page 4.6-142a. <br />b. Section I.A.1., comparisons of ground water annual averages to predicted levels <br />in the PHC, does not include the average annual TDS concentration for wells <br />TR-1.5, TR-3, TR-4, and WR-1. The text and graphs indicate that concentrations <br />at those sites are as expected, but no annual average is given. Please provide <br />annual averages for each well. <br />c. Section I.B.1., Surface Water Annual Average, states that it is unclear whether <br />the prediction for post mining TDS levels in Trout Creek is a long term or short <br />term average, and so both situations are considered. The long term average <br />includes those values over the period from 1981-1991, and the short term average <br />
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