Laserfiche WebLink
upstream wells, 30C, and one of the downstream wells, 30A, are monitored for water <br />quality. These monitoring wells are located downgradient of the bedrock strata, within <br />the alluvium on Mann Draw and will detect downgradient migration of contaminates in <br />the bedrock. They provided adequate monitoring of the effects of mining on alluvial <br />groundwater. <br />On January 12, 1989 the Division approved a technical revision (TR-04) for a reduction <br />in water monitoring at the Bourg Strip Mine. Water level and quality would be <br />monitored on wells 30A and 30C. Other wells were sealed and the crest stage recorder <br />and pazshall flume were removed. The groundwater monitoring plan is outlined on page <br />I-4(a) of the permit application. <br />D. Permanent Gully <br />On September 20, 1990 a technical revision was approved to allow a permanent gully on <br />the reclaimed azea. This gully, located just east of the entrance and flowing north to <br />Mann Draw was regraded into a channel, rock check dams were placed and the area <br />mulched and reseeded per Rule 4.14.6. The Division finds that the establishment of this <br />gully will not disrupt post-mining land use. The establishment of a permanent gully does <br />not prohibit successful revegetation and as of the writing of these findings the gully is <br />well vegetated and stable. The operation is incompliance with the requirements of this <br />Section (Rule 4.14.6). <br />E. Water Rights <br />The applicant has obtained an adjudicated water right for groundwater under Colorado <br />Water Case Number 79CW226. This was used for pumping 10,000 gallons per day <br />(7 gpm) for dust suppression, washdown of equipment and domestic uses. <br />There are no water rights listed in the State Engineer's Office Stream Alpha listing for <br />surface water in Mann Draw. A listing of all wells within the general area of the mine is <br />contained in Table Sb of the permit application. Of the listed wells, only 3 are located <br />within 3 miles of the permit boundary. The Bourg Mine will not impact the quality or <br />quantity of groundwater in [he 3 wells within 3 miles of the permit area, since the <br />groundwater within the mine site is hydrologically isolated from groundwater tributary to <br />these wells. <br />F. Probable Hydrologic Consequences of Mining on Surface Water <br />Bourg Strip Mine. C-81-021 19 August 4, 1998 <br />