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HYDRO23318
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Last modified
8/24/2016 8:43:53 PM
Creation date
11/20/2007 3:43:18 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981018
IBM Index Class Name
Hydrology
Doc Date
8/1/2005
Doc Name
Letter on Groundwater Monitoring
From
Blue Mountain Energy, Inc.
To
DMG
Permit Index Doc Type
Other Ground Water
Media Type
D
Archive
No
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Section 41.4(6)4 pertains to the "Potentially Usable Quality' classification. The <br />bedrock groundwater within the Deserado Mine area does not qualify for this <br />designation per Section 41.4(B)4.d since domestic or agricultural use of the <br />ground water can not be reasonably expected in the future. Expressed <br />limitations when considering this classification include the existing geologic and <br />hydrologic conditions. <br />Therefore, the bedrock groundwater within the Deserado Mine area should be <br />classified as "Limited Use and Quality' per Section 41.4(B)5.c. <br />Proposed Future Hydrologic Monitoring: <br />Blue Mountain Energy, Inc. anticipates a major expansion of our permit area and <br />mining leases in the next few years. As part of the permitting process additional <br />baseline groundwater monitoring data will be required. Mining is anticipated <br />beyond the current monitoring well grid necessitating the addition of down <br />gradient well(s). <br />BME proposes to install two additional monitoring wells, one within the siltstone- <br />coal facies and one in the upper sandstone facies. The siltstone-coal facies well <br />will be monitored for both qualitative and piezometric surface while the upper <br />sandstone facies well will be monitored for piezometric surface only. Both wells <br />are currently projected to be down gradient of future mining and along the <br />syncline axis. The siltstone-coal facies well will tentatively be placed in hole "M" <br />and the upper sandstone facies well in hole "V" or "X". In the past BME typically <br />installed two pipes in the same hole to monitor two zones. Due to the depth of <br />the new wells it is not seen as feasible to place two casings in the same hole due <br />to clearance and associated complications with depth. <br />The lower sandstone facies will not have a down gradient monitoring point <br />installed since qualitative impacts are unlikely, the potential for future beneficial <br />use is negligible, hydrologic impacts are best measured in the siltstone-coal <br />facies, and the depth of this horizon down gradient of anticipated mining activity <br />further diminishes any potential use of this aquitard. At point "M" the 'B' seam is <br />at an estimated 1,123 feet with the lower sandstone facies approximately 50 feet <br />below that. At holes "V" and "X" we anticipate encountering the 'B' seam at <br />1,413' and 1,570' respectively. <br />Planned monitoring well construction will be with 2" PVC using 40' of slotted <br />screen per well. Approximately 60' sand pack will be used per well. Bentonite <br />pellets will be placed above the sand pack and the remainder of the hole sealed <br />using bentonite with Portland type II at the surface. Any hole below the casing <br />will be backfilled using bentonite and/or Portland type II cement. The siltstone- <br />coal facies well will start at the bottom of the `B' seam. The monitored zone for <br />
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