2014-02-27_REVISION - C1981010 - Laserfiche WebLink

Home Browse Search

Trapper Mining, Inc. C- 1981 -010; PR7 Adequacy Review No. 2 Page 3 of 15 2.04.5, General Description of Hydrology and Geology; 6. Prior to anv disturbance within the expansion area, section 2.07 of the permit will need to be updated to provide the information required by Rule 2.04.5. The Division will add a stipulation to the approval of this permit revision to this effect. a. Trapper's Response: Please see the response to comments 7 and 8. b. Division's Response: Based on a review of Trapper's response to comments 7 and 8, the Division agrees the general hydrology and geology presented in the respective section of section 2.07 in the permit meet the requirements of this rule. 2.04.6 Geology Description; 7. A review of the site specific Geology baseline information contained in the permit currently does not appear to extend into the PR7 expansion area. Rule 2.04.6(2) for surface mining activities requires a description of the geology within the proposed area to be affected over the life of the operation down to and including the first aquifer and other coal seams, if anv, below the lowest coal seam to be mined. Prior to mining in the proposed expansion area, the Operator will need to submit a permit revision to the application that contains the information required in Rule 2.04.6(2). The Division will add a stipulation to the approval of this permit revision to this effect. a. Trapper's Response: The geologic setting is the same for the permit extensioun area as that presented inn the Trapper Permit, Fugure 2,74 inn the Trapper Pernnit presents the structure of the basin tun the area of the mine. Structure of the coal seams was rev uevv ed for the permit extensions area_ The revuevv showed that the typical dip to the ninth 61 the usortheasteni por ions of the Trapper permit area is changing to the nnorthvvest ins Sections 28 T6N R90W. Thus change fits the regiounall structure clnange that is shove us ins Figure 2.7 4. Additionsallllv- please see the response to comment 8. b. Division's Response: Trapper's response indicates the geologic setting is the same in the permit extension area. As indicated in item 46 above, the Division agrees that the general geologic setting is the same. However, the site specific geologic information will need to be updated prior to mining in the expansion area. Permit sections 2.7.2; Overburden Characteristics and section 2.73; Coal Characteristics appears to be based on bore holes sampled within the current permit area and not the expansion area. Also, Map M11, Site Specific Geologic Map does not extend into the permit expansion area. Given this, the information required in Rule 2.04.6(2)(a) and (b) will need to be incorporated into the permit through a revision prior to mining in this area. As indicated originally for this adequacy item, the Division will stipulate the approval of this permit revision to this effect. In accordance with Rule 2.04.6(2)(b)(iv), Trapper may request the requirement for a statement of the results of test borings or core samples taken within the expansion area be waived by the Division. If so, Trapper will need to demonstrate why this information is unnecessary. 2.04.7 Hydrology Description 8. Based on the surface and groundwater analyses discussed in section 2.07 of the permit, it does not appear the surface and ground water system of the expansion area has been analyzed. This information is required for the proposed permit area and adjacent areas, not _just areas that are to be disturbed. a. For the expansion area please submit a description of the groundwater hydrology for the proposed permit and adjacent area in accordance with Rule 2.04.7(1)(a). i. Trapper's Response: Growid water hr-drollogy vv uthinn the permit ezpamn onn area does snot dramatically cllnange. Tlne structure maps for I and R coal seams were used to aid inn the