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.: <br /> ~ II II ~II ~II ~II~ I ~II <br /> <br /> ~T,AT~, OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />De}rarlmenl el Natural Resources <br />1313 Sherman SL, Room 215 <br />Denver, Colorado 80203 D I v 1 5 1 o N o F l <br />Phone: 13031 866-3567 MINERAL S <br />FAX: 1303) 832-8106 & <br /> GEOLOGY <br /> 0.EC LAMATION <br />MINING•SAFETY <br /> Bill Owens <br /> Governor <br /> INTEROFFICE MEMORANDUM GregE Watcher <br /> Executive Duector <br /> M¢hael 8. Long <br /> Division Director <br />TO: Joe Dudash <br />FROM: Mike Boulay <br />DATE: January 5, l~ l 9 y 9 <br />SUBJECT: Bowie No.2 Mine, Permit No. C-96-083, Technical Rev ision No. 6 <br />Per our conversation regarding TR-06 at the Bowie No. 2 Mine, I have the following concerns with <br />respect to surface water and groundwater related issues- Bowie proposes to build a new coal <br />stockpile pad near the southern portion of the permit area and two new sediment control ponds. <br />Pond B is to be located immediatelydown gradient of the coal stockpilepad. Pond C is to be located <br />west of the existing Gob Pile. <br />With respect to surface water monitoring, please be sure that the operator has adequate upgradient <br />and down gradient monitoring points for surface water. Two locations along the deer trail ditch <br />which flows adjacent to the Fire Mountain Canal are currently monitored. One point is located <br />upgradient in close proximity to Hubbard Creek, the other point exists down gradient of the current <br />disturbed area in the vicinity of monitoring well A1N-1. The upgradientpoint isprobably fine. The <br />down gradient location may need to be reconsidered so that the entire disturbed area is monitored. <br />[n particular, the down gradient monitoring point should be located downstream of the entire <br />disturbed area associated with the proposed stockpile pad and Pond B. Also if there is the potential <br />for surface water to enter the Fire Mountain Canal from the ditch and/or runoff from the site, then <br />monitoring points within the Fire Mountain Canal may be warranted. <br />With the new coal stockpile pad and Pond B, the potential exists for significant increase in total <br />dissolved solids (TDS) and degradationof the water quality within the shallowalluvial aquiferdown <br />gradient of [he proposed facilities. This would be the result of water percolating through the <br />stockpile and potential discharge from the bottom of [he unlined Pond B. This water may migrate <br />down gradient and eventually discharge to the North Fork of the Gunnison River. To adequately <br />assess these potential impacts to the alluvial aquifer and the North fork of the Gunnison River. <br />additional monitoring should be required. <br />