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Mine Boundary Changes <br />Change 1• <br />The Division's approval of Technical Revision #30, dated 10/28/94, formalized the process of <br />removing Sections 26 and 35, Township 3 North, Range 64 West, from the Permit Area of the <br />Keenesburg Mine. Coors Energy Company (CEC) recognizes that while these two Sections have <br />not been disturbed by mining or ash/mine waste rock disposal activities, the property was <br />disturbed in the process of gathering baseline groundwater data for the original permit. <br />The following well nests are still located within the area vacated under TR -30: <br />Section 26: wells # 134,137 & 138; #162 & 163; #171, 172,173 & 174 <br />Section 35: wells # 132 & 133 <br />The map location of these wells can be found on Figure 3 (page 62). <br />Pursuant to an agreement with Waste Services Company, the Division has been provided with <br />certain baseline information from monitoring and analysis wells located within the boundary of <br />the newly established East Weld Sanitary Landfill (EWSL), to the west of the Keenesburg Mine <br />permit boundary. This information included a drawing of the monitor well locations, a <br />piezometric surface map and baseline date from the existing wells in the EWSL permit area. <br />When it becomes available, the Division is also to be furnished two years of monitoring data from <br />the EWSL Monitoring Wells #s 1, 5, 7, 8, 9 & 10. These wells are complete and data is presently <br />being collected by Waste Services. <br />In accordance with TR -30, CEC will submit a Minor Revision seeking authorization to <br />permanently seal wells: 132, 133, 134, 137, 138, 162, 163, 171, 172, 173 & 174. The sealing <br />procedure will follow Rule 4.07.3 (Permanent Sealing). Once the wells are sealed and site <br />approval has been obtained, CEC will pursue Performance Bond Release as it may be applicable <br />to Sections 26 and 35. <br />CEC does not anticipate that this change of mine boundary will necessitate any modification of <br />the Hydrology Description (Section 2.04.7), or any change to the present ground water <br />monitoring program: i.e. the quarterly monitoring of the following six wells: DH -96 (down <br />gradient of Permit Area), DH -122 (Ennis Draw), SMW -2 (Spoil area), AMW -1 and AMW -2 <br />(down gradient of ash disposal areas), and FPW (Fire Protection Well). <br />Change 2• <br />Approval of Technical Revision #33, dated 02/16/01, as an incidental boundary change, provided <br />for removal of a portion of Section 36 from the Permit Area of the Keenesburg Mine. The <br />subject acreage was left undisturbed by both the mining and the ash/mine waste rock disposal <br />activities, and was not disturbed by the process of gathering baseline groundwater data for the <br />original permit. No wells have been identified as being located within the area to be removed <br />from the Permit. For this reason, CEC does not anticipate that the mine boundary change will <br />necessitate modification of the Hydrology Description (Section 2.04.7), or any changes to the <br />• ground water monitoring program. <br />60 04/11 <br />