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6.0 GRASSY VALLEY <br />6.1 Current Conditions <br />The Grassy Valley drainage and MLE permit boundary are shown on Figure 2 -1. Grassy Valley <br />is a southeast to east oriented drainage. Grassy Valley merges with Beaver Creek approximately <br />2,500 feet east of where Teller County Road 81 crosses the Grassy Valley drainage. <br />MLE approved mine disturbance in the Grassy Valley drainage consists of the Wildhorse <br />Extension portion of the North Cresson Mine Area, the clay borrow source and the storage <br />stockpile, the East Cresson Overburden Storage Area ( "ECOSA "), and associated surface <br />facilities in the upper reaches of the Grassy Valley drainage. The existing EMPs that collect and <br />dissipate storm water runoff are shown on Figure 2 -1. <br />6.2 Mine Life Extension 2 <br />MLE2 will extend the Wildhorse Extension ( "WHEX ") in the upper reaches of Grassy Valley. <br />The East Cresson Overburden Storage Area ("ECOSA") will be extended in the middle reaches <br />of Grassy Valley. These activities are described in detail in Section 5.0 of the Project <br />Description. Due to the mine development activities in Grassy Valley, the EMPs will be <br />relocated to manage the surface water runoff. The disturbance limits and the proposed facilities <br />for MLE2 are shown on Figure 2 -2. <br />6.3 Surface Water <br />6.3.1 Monitoring Program <br />Surface water conditions in the Grassy Valley drainage are assessed at three locations. <br />These stations (in the downstream direction) are GV -01, GV -02, and GV -03. Surface <br />water stations are shown on Figure 2 -2. GV -03 is located within the Diatreme; surface <br />stations GV -01 and GV -02 are located over the granites adjacent to the Diatreme. <br />Field parameters and water quality samples are collected quarterly at GV -01, GV -02, and <br />GV -03 and analyzed for the parameters listed in Table 3 -1. Pressure transducers are <br />installed at GV -01, GV -02, and GV -03 to continuously monitor the depth of water in the <br />Parshall flumes during periods of surface water flow. <br />6.3.2 Data <br />The period of record and compiled field measurements and water quality data (number of <br />measurements, less than detection events, maximum value, minimum value, average <br />'Cripple Creek & Victor Gold Mining Company <br />Cresson Project Hydrologic Evaluation for Mine Life Extension 2 <br />31 <br />