2014-07-29_REVISION - C1981010 (3)

Home Browse Search

Forrest Luke, TMI Page 3 7/29/2014 Three ground -water monitoring wells are proposed to be added in the northeast comer of the permit addition area. These wells would be completed in the alluvial, HI and QR aquifers in the permit extension area. Further relevant discussions to the hydrologic regime of the expansion area will be covered in the 2013 Annual Hydrology Report, including extended Water -Level Elevation maps depicting the extent of subsurface water and overall geologic trends. ii. Division's Response: Trapper's Permit section 2.7.5; Pre - Mining Conditions — Ground Water, indicates baseline investigations covered the western portion of the permit area, i.e. the area from Pyeatt Gulch west. In 1985, baseline information was collected to cover the eastern portion of the permit area, i.e. Pyeatt Gulch and the area to the east. Specifically, Sections 2.7.5.1 and 2.7.5. la, Sections 2.7.5.2 and 2.7.5.2a as well as Sections 2.7.5.3 and 2.73a, contain the baseline groundwater information for the current permit area. The sections with an (a) at the end of the section number covers the eastern permit area. Trapper's response to the first adequacy review indicates that there are changes to the groundwater regime within the expansion area, though not dramatic. The response also indicates relevant groundwater information will be updated with the annual hydrology report. Baseline groundwater information should be included in permit section 2.7.5 that currently contains this information and not solely in the Annual Hydrology Report. Prior to the approval of PR7, Trapper will need to add information about the ground water regime required in Rule 2.04.7(1)(a) to the permit section 2.7.5 which contains the baseline groundwater information. At this time, this item remains outstanding. iii. Trapper's Response #2: Please see the attached permit pages (2 -4141, 2- 414m, 2 -520ww to 2- 520zz, 2- 520aaa to 2- 520zz, 2- 520aaaa to 2- 520gggg, and 2 -523y) updating Sections 2.7.5.1, 2 and 3 with new sub - sections and data addressing baseline groundwater information in the eastern expansion area. Map series M54 has also been updated with current ground water elevations for the entire mine including the permit expansion area. iv. Division's Response: Trapper proposes to revise /replace maps M54, M54B and M54C. These maps currently contain the baseline water -level elevations for the former permit area from 1986. The Division would like to retain these baseline water elevation maps as part of the permit. The new maps depict the 2013 or 2011 water elevations for the "SS ", HI and the QR aquifers throughout the permit area including the expansion area which is required, but these maps should be submitted in addition to the current maps and should not replace them. Please re -title these maps within the M54 series and update the table of content accordingly.