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M -3- C. Hydrologic Monitoring Plan 1. A minor typographic error exists on page 1 of Exhibit 15. On this page it is stated that theplan for monitoring the surface mine consists of four components; howeve~rlll, only three components are listed. The fourth component should read "Surface water stream monitoring'. 2. Of the five st eam monitor sites listed in Table A, one of the sites, site ~; is not identif ed on Map 4, Mine No, 3 Hydrology. Additionally, the tvo effluent monitor sues, sites 24 and 76, are not clearly identified on the map as such. These mo 7tor sites should be located on the map. Also, shallow aquifer monitor we~l 008-AY-4 is listed twice in Table A. 3. The revised paiameter list (Table C) should also include chloride for both ground and surface water analyses. G z 4. Existing recor site has not been or quantity. In o reclaimed areas, g system, total susp spoils aquifers on quality must be ma Available records Foidel Creek upstr conducted on Middl Hydrologic Monitor and quantity sampl Foidel Creek prefe and a downstream g site 29. Monitorl the other monitor schedule 1n Table 5. NPDES permit monitored for ave The Division requ points) also be m dissolved solids Tabulations of re Included in the a ds show that surface water data coTlectton at the Mtne No. 3 dequate to detect effects of mining on stream water quality der to evaluate contribution of runoff from disturbed and ins/losses of surface water to the alluvial ground water ~nded and dissolved solids load, and possible Influence of the surface water system, stream flow quantity and water nitored both upstream and downstream from the mine site. show that water quality monitoring has not occurred on eam of the mine site and stream flow monttoring has not been e Creek downstream of the mine site. The proposed ing Plan should be modified to include surface water quality ing at these two locations. Water quality upstream on rably should be monitored at USGS Gaging Station 09243900, aging station should be Installed on Middle Creek near CYCC ng frequency for these locations should be synchronized with sites on Foidel and Middle Creeks in accordance with the C (Exhibit 15). equirements stipulate that flow from discharge points be age and maximum flow rates and water quality parameters. sts that all discharge from the detention basins (discharge nitored for duration of flow, so that total suspended and oading calculations can be made for these discharges. ults from all monitoring of discharge points should be pllcant's annual hydrologic reports to the Division. ~~~J~2'1 °yi~ IJ o 0 1= -1-`~5 L'~~~~f'~p'_Q'' G~. ~ I b~"" Re~~l~~' ~~~ 6. As discussed below under "Probable Hydrologic Consequences", two additional ground water monitor sites should be added to the applicant's I Hydrologic Monito ing Plan. These monitor wells should be installed within ~i the reclaimed spoils at the Middle Creek Pit and near the Mine No. 3 Detention r~ Basin. The exact location of these monitor sites should be determined through a~ consultation with the Division prior to well Installation. Water levels and /.,, field parameters for these monitor sites should be sampled monthly and 'I ,nom full-suite water quality analyses should be conducted semi-annually in ~ /q/„~l_j(1 accordance w7th t}~e schedule for shallow wells in Table 8 of Exhibit 15. % s