2014-06-17_REVISION - C1981014 - Laserfiche WebLink

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17. Section 2.05.6(1) of the PAP should be revised to reflect the current status of the air permit. This section, as well as Exhibit 4, should be revised to indicate the current status of the permit but text should be retained to illustrate the history of the permit. Revised page(s): 2.05.6 -1 Exhibit 4 Table of Contents 18. Section 2.05.6(3) of the PAP should be revised to correct the following inaccuracies. On page 2.05.6 -10 the text states that Oak Creek is monitored for surface water quality (also on page 2.05.6 -52). On page 2.05.6 -16 the text states that there will be modifications to Magpie Diversion. On page 2.05.6- 17 the text states that there are three ponds at the mine site. On page 2.05.6- 18 the text discusses the water treatment pond. Revised page(s): 2.05.6 -10 2.05.6 -1 Oa 205.6 -16 205.6 -18 205.6 -18a 205.6 -52 205.6 -52a 19. On page 2.05.6 -21 of the PAP there is a discussion of potential problems with TDS in runoff, and the text states that EFCI will implement controls if problems are noted. However, there is no process in place to assess this potential problem below Pond 5. The discharge from this pond is not monitored for TDS or conductivity, and there is no monitoring point in the receiving water below this. (Conductivity is monitored in Newlin Creek, Magpie Creek, and Second Alkali Creek, but not below Pond 5.) EFCI needs to address this issue. RESPONSE: Pond 5 discharges into an unnamed tributary of Magpie Creek. This tributary joins Magpie Creek, then the combined flows enter Newlin Creek approximately one mile northeast of the Southfield mine site. At the time Pond 5 was established as a sediment pond by Dorchester Coal Company (Dorchester), a surface mine owned by GEC Minerals (GEC) was operating adjacent to both Magpie Creek and the unnamed tributary. The GEC mining operations were immediately adjacent to Southfield's surface facilities and Pond 5, and runoff from all GEC disturbance areas flowed into the Magpie Creek stream system. This includes a portion of the GEC site runoff entering the unnamed tributary immediately below the spillway of Pond 5. The GEC mine disturbance area is significantly larger than that of Southfield, and as such has higher potential to impact the stream system below Pond 5. There is no location to monitor downstream of Pond 5 to accurately differentiate any potential problems with TDS attributed to Pond 5 discharge compared to the discharge from the GEC mine site.