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REP14099
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REP14099
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Last modified
8/24/2016 11:44:08 PM
Creation date
11/27/2007 1:22:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
Report
Doc Date
5/4/1994
Doc Name
1993 AHR and ARR review letter
From
DMG
To
COORS ENERGY
Annual Report Year
1993
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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<br />wide swings in pH. <br />Regarding Specific conductance, noted levels are elevated in SMW-2, <br />rising from 5,400 to 7,000 mg/1 for the first quarter of 1993. <br />All well data was compared against the 1992 AHR data for any <br />significant trends or increase in parameter measurements. Some <br />trends noted were the following: <br />1. In the forth quarter on well FPW, both methods of measurement <br />seem to be within the same range. Divergent data in the same <br />quarter seem to be evident on DH122 using the two methods. <br />This would seem to indicate that there is no conclusive <br />evidence yet to attest to the preference of one method of <br />bailing over the other at this present time. <br />2. Manganese levels are still above the recommended Colorado <br />Department of Health codes for DH96 in the third quarter, up <br />from .38-.49 to 1.5-0.5 (two methods of bailing and measuring <br />continue to be used for data collection this year). <br />3. Both the specific conductance and TDS seem to be down from <br />1992 forth quarter levels in the spoils well SMW-2. <br />In 1993 Keenesburg also established a replacement well for AMW-1 <br />(drilled in 1987) to monitor any recharge from the A Pit area. The <br />original well was believed to have been misdrilled as it registered <br />"dry" readings for the last five years. However, the new well, <br />drilled within five feet of the original has also come up dry. The <br />Annual Hydrology report needs to reflect this fact and also include <br />a possible explanation for the dry readings to date. <br />The ground water data collected during the last year indicates that <br />the impacts from the mining operation and present ash disposal <br />operation on the hydrologic balance are in line with those impacts <br />predicted in the 1986 Division's Findings document. <br />The Annual Hydrology Report also includes the Annual Vegetation <br />Report as well as satisfying Stipulation Nos. 17, 20, 21, and 23 <br />through 25. <br />Stioulation Nos. 17, 20, 21, 23-25 <br />A mass balance calculation of available spoil has been performed <br />and is included in the report per stipulation requirements. <br />The amount of ash disposed of at the Keenesburg mine was estimated <br />to be 25,060 tons, distributed in both A and B Pits. A Pit was <br />closed and B Pit opened for ash disposal. Fly and bottom ash <br />samples have been collected and analyzed with the analysis included <br />in the report. <br />
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