2015-08-14_REVISION - C1982056 - Laserfiche WebLink

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ii. Exhibit 4E -I1 submitted with the response letter indicates wells 008AVF1 and 008AVF2 are downstream of the WCR mining area in the Foidel Creek alluvium. The Division could not locate well 008AVF1 on the 13a Map. Please revise this map to depict the location of this well. iii. Is there an upstream monitoring well for the Foidel Creek alluvium that would be appropriate to use to monitor impacts related to mining in the WCR? Would well 009-5-10 be appropriate to use? If not, TC will need to revise the monitoring plan and install an upstream well. iv. Surface Water Site SW15 is located within the affected area associated with mining in the WCR. Given this, it would be appropriate to install a new downstream monitoring site outside of the affected area to evaluate impacts to the Fish Creek surface water. V. Site 900 appears to be upstream of the WCR affected area along Foidel Creek. Given this, it would not serve as an appropriate downstream monitoring station for Foidel Creek. Please revise the monitoring plan to monitor a site that is downstream of the WCR affected area. vi. The monitoring frequency for Site 8 and 900 do not match the monitoring frequency currently approved in Exhibit 14 in the permit for these sites. Does TC intend to conduct additional monitoring in accordance with the proposed plan submitted with Exhibit 4E-11? If so, please revise the water monitoring plan currently approved to match what is proposed in Exhibit 4E -I1. vii. Please revise the monitoring plan to indicate when the ponding and vegetation monitoring plan will be suspended. Response: Alluvial Well AVF15 is located just on the edge of the zone of potential subsidence effects and may or may not be impacted, however, there are two existing active downstream alluvial monitoring wells, 008 -AU 3 and 008 -AW 3, on Fish Creek which can be used to provide information on any downstream water quantity/quality effects from the proposed WCR mining activities. On Map 13a, the label for 008- AV 2 is inside a box, which also includes the label for 008 -AV 1. The two alluvial wells are in close proximity, and located near the junction of Foidel and Middle creeks. The upstream Foidel Creek alluvial monitoring well is 001-5 5 (added to Exhibit 4E-11). Site SW -15 is located just on the edge of the zone of potential subsidence effects and may or may not be impacted, however, existing active downstream monitoring Site 305 on Fish Creek can be used to provide information on any downstream water quantity/quality effects from the proposed WCR mining activities. As previously noted, Site 900 now falls within the eastern limits of the planned WCR mining area, however, existing Site 29 is outside the affected area, and would be suitable for collection of information on any downstream water quantity/quality effects from the proposed WCR mining activities. Both Site 8 and Site 900 are on a monitoring schedule which varies seasonally. Exhibit 4E-11 has been revised to reflect this consideration and reference back to the monitoring schedule details provided in Exhibit 14. The discussion of monitoring for ponding and vegetation changes has been reviewed and revised to clarify the timing and duration of monitoring activities. In reviewing the relevant documents, an inconsistency was noted in Exhibit 14, Hydrologic Monitoring Plan on page Exhibit 14-1, which has been corrected. Copies of the relevant revised text accompany these responses for replacement in the PAP.