2014-09-18_REVISION - C1996083 (2)

Home Browse Search

Susan Burgmaier -4- September 12, 2014 BRL - The language regarding flow monitoring on the West Fork of Terror Creek was revised on pages 2.05 -126 and 2.05 -169. 32. Issue resolved. Rule 2.05.6(6) Subsidence Survey, Subsidence Monitoring, and Subsidence Control Plan 42. a. Issue resolved. Rule 2.04.7 - Hydrology Description Rule 2.04.7(1) - Ground Water Information 47. Issue resolved. 49. BRL provided details of the proposed new wells, as requested. The generalized Monitoring Well Completion Drawing will be a useful addition to the permit. The location of the two proposed wells is shown on maps 9, 10A and 10B. Using the contour lines to approximate, the site is at an elevation of 7800'. Viewing the points overlaid on an aerial image suggests that they are -180m west of the WAPA Transmission line access road. The projected potentiometric surfaces on Maps 10A and 10B show a discontinuity of aligned with a northwest /southeast trending fault line. Those maps each show significantly higher head values ( >200') to the east of the fault line compared to the west. If the maps accurately depict the surface, the inference must be that the hydrologic connection between the two sides of the fault is very limited. Although wells drilled at those locations might be down -dip of the majority of the workings, the fact that they are on the other side of the fault makes it unlikely that they would monitor water directly affected by the western workings. The wells could not be considered to be down gradient of the workings. Figures 1 and 2, below, show a pink polygon bounded by the projected 7800' contour, proposed limit of the mine workings, and western edge of the fault line. Figure 2 is drawn at a larger scale; the aerial image base map shows what appear to be tracks or roads crossing the polygon, suggesting that vehicle access may be possible. Has BRL considered sites at this general location? Please provide additional information to demonstrate that the proposed location of the point of compliance wells are sufficiently hydrologically connected to the western workings such that they would monitor water directly affected by the western workings, or propose a new location for the monitoring wells that would allow for monitoring water directly affected by the western workings. BRL - The down gradient wells were relocated so they are west of the fault and away from the projected angle of draw. 61. BRL submitted a revised table of contents to incorporate new Volume 1116, and made subsequent edits as a result of the Division's second adequacy review, so that only revised page vi is to be considered under 1311-14. BRL provided a revised page vi listing Exhibits 11 -23, with