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REP18650
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Entry Properties
Last modified
8/24/2016 11:47:29 PM
Creation date
11/27/2007 2:27:22 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981034
IBM Index Class Name
Report
Doc Date
1/6/1988
Doc Name
1986 & 1987 AHR RED CANYON MINE C-81-034
From
MLRD
To
GRAND MESA COAL CO
Annual Report Year
1986
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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<br /> <br />" pF'p0~ <br />N <br />FRS ~~ II I <br />Y ~ i <br />~ 4 <br />~ X876 ~ <br />C ~ ~- <br />STATE OF COLORADO <br />IIIIIIIIIIIII III Roy Romer, Governor ~~ <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Director <br />January 6, 1988 <br />Mr. Larry Reschke <br />Grand Mesa Coal Company <br />P.0. Box 1351 <br />Palisade, Colorado 81526 <br />Re: 1986-1987 AHR, Red Canyon Mine, C-81-034 <br />Dear hir. Reschke: <br />I have reviewed the data collected at Red Canyon Mine during the 1987 water <br />year and the summary provided and find them both acceptable. However, the <br />data would be easier to evaluate, if figures of historic water level <br />measurements were provided. During a phone conversation of January 6, 1988, <br />we discussed two omissions from the report concerning the trigger monitoring <br />mechanism for the refuse pile piezometers and the status of the coal seam <br />piezometer, E-3. <br />The trigger monitoring mechanism for the refuse pile piezometers is described <br />in the May 15, 1986, letter from John Doerfer, CMLRD, to Larry Reschke, Grand <br />Mesa Coal Company, on page 2, Section 3c. It calls for full suite monitoring <br />at these sites when the conductivity exceeds 10,000 umhos/cm2 at 25°C or <br />when the pH drops below 5. In our phone conversation, you indicated that you <br />thought that the trigger kicked in at greater than 10,000 umhos/cm2 field <br />temperature, which you had not achieved during the sampling when temperatures <br />ranged between 12° and 15°. Furthernlore, .You pointed out that background <br />levels frequently exceeded 10,000 umhos/cmz and were lower than a pH of 5, <br />and that Grand Mesa would like to remove the trigger mechanism. The Division <br />required the trigger mechanism to ensure adequate monitoring if conditions at <br />the mine changed, Should Grand Mesa propose to modify the hydrologic <br />monitoring plan, the Division would accept a trigger mechanism which initiated <br />full suite monitoring when the conductivity increased fifteen percent (15g) <br />over the average level or when the pH dropped 0.5 pH unit below the historic <br />average. We are unwilling to eliminate the trigger mechanism in its entirety. <br />Coal seam piezometer E-3 apparently broke off near the surface between <br />October, 1986, and June, 1987. The Division requests that Grand Mesa repair <br />this well prior to the next sampling period, which would occur in June, 1988. <br />This well is one of three wells in the coal seam which was mined at Red <br />Canyon, and provides information integral to preparing a piezametric map. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />
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