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<br />-a- <br />3. The revised parameter list (Table C) should also include chloride for both <br />ground and surface water analyses. <br />4. Existing records show that surface water data collection at the Mine No. 3 <br />site has not been adequate to detect effects of mining on stream water quality <br />or quantity. In order to evaluate contribution of runoff from disturbed and <br />reclaimed areas, gains/losses of surface water to the alluvial ground water <br />system total suspended and dissolved solids load, and possible influence of <br />spoils aquifers on the surface water system, stream flow quantity and water <br />quality must be monitored both upstream and downstream from the mine site. <br />Available records show that water quality monitoring has not occurred on <br />Foidel Creek upstream of the mine site and stream flow monitoring has not been <br />conducted on Middle Creek downstream of the mine site. The proposed <br />Hydrologic Monitoring Plan should be modified to include surface water quality <br />and quantity sampling at these two locations. Water quality upstream on <br />Foidel Creek preferably should be monitored at USGS Gaging Station 09243900, <br />and a downstream gaging station should be installed on Middle Creek near CYCC <br />site 29. Monitoring frequency for these locations should be synchronized with <br />the other monitor sites on Foidel and Middle Creeks in accordance with the <br />schedule in Table C (Exhibit 15). <br />5. NPDES permit requirements stipulate that flow from discharge points be <br />monitored for average and maximum flow rates and water quality parameters. <br />The Dl vision requests that all discharge from the detention basins (discharge <br />points) also be monitored for duration of flow, so that total suspended and <br />dissolved solids loading calculations can be made for these discharges. <br />Tabulations of results from all monitoring of discharge points should be <br />included in the applicant's annual hydrologic reports to the Division. <br />6. As discussed below under "Probable Hydrologic Consequences", two <br />additional ground water monitor sites should be added to the applicant's <br />hydrologic monitoring plan. These monitor wells should be installed within <br />the reclaimed spoils at the Middle Creek Pit and near the Mine No. 3 Detention <br />Basin. The exact location of these monitor sites should be determined through <br />consultation with the Division prior to well installation. Water levels and <br />field parameters for these monitor sites should be sampled monthly and <br />full-suite water quality analyses should be conducted semi-annually to <br />accordance with the schedule for shallow wells in Table B of Exhibit 15. <br />7. Due to the potential for full saturation of the backfilled mine pits near <br />the toes of the pits, the applicant should instigate a monitoring program to <br />visually Inspect the areas near the toes of the reclaimed mine pits for <br />evidence of springs or seeps emanating from the pits. If this inspection <br />program reveals the existence of springs or seeps, they should be monitored <br />for flow rate, duration of flow, and water quality parameters in consultation <br />with the Division. The visual inspection program should be conducted on a <br />monthly basis, except when snow-pack cover prohibits 1t. All results of this <br />inspection and monitoring program should be included in the applicant's annual <br />hydrologic reports to the Division. <br />