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<br />215W, 215L, 218W, and 218L; and at the West Ridge spoils well <br />WR-l. Ground water quality will be monitored at TR-1.5, <br />TR-3, TR-4, and WR-1. Locations of all wells are depicted in <br />Exhibit 4.6-26. Frequency and parameters are listed in <br />Table 1 of this document. Spoils well locations in the <br />Moffat Area have not yet been determined. Pittsburg & Midway <br />and the Division will mutually agree upon the number and <br />location of spoils wells as mining in the Moffat Area <br />progresses (4.05.13(1)). <br />2. The applicant will conduct monitoring of Surface water in a <br />manner approved by the Division. The monitoring plan was <br />submitted under 2.05.6(3)(b)(iv) and includes the following: <br />A continuous flow-monitoring site (TR-a on Trout Creek) <br />upstream of the mine will be maintained from April through <br />October. Instantaneous flow measurements at site TR-b on <br />Trout Creek will also be taken April through October. Weekly <br />flow measurements will be taken at the NPDES sampling <br />points. Locations of the surface water monitoring sites are <br />depicted in Exhibit 4.6-26 of the permit application. <br />Surface water quality is monitored upstream at TR-A, <br />downstream at TR-D, in the Moffat Area at TR-C, and in the <br />West Ridge Area at TR-B. Frequency and parameters are listed <br />in Table 1 of this document (4.05.13(2)). <br />D. Stream Buffer Zones <br />The Division approved surface or underground mining <br />activities within i00 feet or through a perennial stream or <br />stream with a biological community. This decision was based <br />on a finding that the original stream channel will be <br />restored, water quality and quantity shall not be adversely <br />affected, and appropriate riparian vegetation will be <br />reestablished. The buffer zone variance was granted for the <br />water pump station on Trout Creek, and for the facilities <br />area along Oak Creek (4.05.18(1)). <br />E. Probable Hydrologic Consequences of Mining <br />Surface Water <br />Information on probable hydrologic consequences can be found in <br />Volume 3, Section 2.5 and Volume 11, Section 4.6 of the permit <br />application. <br />The hydrologic balante calculations and related information <br />provided in the application allow quantitative estimates to be made <br />in predicting the probable hydrologic consequences of mining on <br />receiving waters. The principle effects of mining will occur in <br />the Trout Creek basin where mining occurs. <br />Impacts on Oak Creek are related to altered timing of flows and <br />water quality resulting from sediment pond discharges. The series <br />-19- <br />