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plan view of the pond and associated drainage structures is depicted on Figure 2.2 -6, cross - <br />section and specifications are depicted on Figure 2.2 -7. The pond is an incised impoundment <br />with a design capacity of 0.75 acre feet. The design includes a 6" valved primary spillway <br />pipe installed at the maximum sediment storage level, and a riprapped open channel <br />emergency spillway at an elevation four feet higher than the primary spillway inlet. <br />D. Surface and Ground Water Monitoring <br />Surface Water <br />The surface water monitoring program is addressed in Section 2.5 of the application text, <br />parameter list is presented in Table 2.5 -2, and monitoring site locations are shown on Figure <br />2.3 -5. <br />Adequate baseline data indicating characteristics of water quantity and quality for East Salt <br />Creek in the vicinity of Munger Canyon and for the drainage in Munger Canyon was <br />provided in the original permit application, summarized in Section 4.5 of the application text. <br />Total dissolved solids in East Salt Creek have been noted over a range of 600 mg/1 to 10,000 <br />mg/l. Water is typically a sodium sulfate type. <br />In Munger Creek, like most semi -arid ephemeral drainages, dissolved constituents in surface <br />water often reach high levels during storm runoff. Dissolved solids measured in Munger <br />Canyon ranged from 92 mg/1 in December to 956 mg/1 in April. <br />Subsequent to issuance of the initial permanent regulatory program permit, the operator <br />implemented a plan for the collection, recording and reporting of surface water quality and <br />quantity data. The program consists of surface water monitoring above and below the <br />disturbance in the Munger Canyon tributary, along Munger Canyon before the confluence <br />with East Salt Creek and along East Salt Creek upstream and downstream of the confluence <br />with Munger Canyon. This monitoring plan will be sufficient to identify any effects of the <br />operation on the surface water hydrology. The hydrology monitoring program for the <br />Munger Canyon Mine is in part combined with the monitoring program for the adjacent <br />McClane Canyon Mine, which is also operated by CAM, and data collected at several of the <br />sites fulfills monitoring requirements for both permits. A combined Annual Hydrology <br />Report with sample data, summaries, and impact assessment for each mine is submitted by <br />March 31 of each year, covering the previous water year. <br />The operator has committed to the following surface water monitoring program: <br />1) Flow measurements will be taken at surface water monitoring sites SW -1, upstream <br />from the mine on East Salt Creek, and SW -3, in Munger Creek downstream from the <br />mine site. The measurements will be taken twice a year if water is available to <br />sample. Measurements will be taken once during spring snow melt and once during a <br />storm event. <br />19 <br />