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Marr Mine - 2005 Annual Hydrology Report February 2006 <br />6.0 MINE AREA SURFACE WATER <br />The sediment ponds (Stations 301, 302, 303, 304, 305, and 321) were monitored weekly from <br />March through June and monthly during the remaining months through September, 2005. There <br />was some inflow from snowmelt in March but no outflows. Outflows were observed in later <br />months on several occasions due to an above average snow year and spring storms. Discharges <br />inGuded Stations 301, 304, 305 and 321, which all had outflows a1 least twice during the <br />monitoring period. Note that discharges at the mine over the previous 4 years have been very <br />minimal. There were no single discharges at the mine in water years 2001, 2002 and 2004 and <br />those in 2003 were minimal. All of the ponds fitted at least partially during April and May antl <br />retained some water through the summer. No visible oil E, grease was observed in any outflow. <br />Samples were collected on two occasions and tested for SetNeable Solids. The field and <br />laboratory measurements for the 2005 water year are presented in Table 10, Mine Area Surface <br />Water Quality Dafa. The 2005 average pH and Flow data for each discharging station are <br />presented on Figure 6, Mine Area Surface Water Average pH vs. Flow. The recorded <br />measurements and field observations are contained on the field data logs in Appendix A, 2005 <br />Field Data. The analytical data is presented in Appendix D. <br />Surface water sites 300, 306, 322, and 327 were dropped from monitoring as of January 1999 <br />and Station 314 was eliminated from the monitoring program in October 1999. No data was <br />collected from any of these sites during the 2005 water year. <br />TABLE 10 -MINE AREA SURFACE WATER QUALITY DATA <br /> 4/5/2005 4/11/2005 4/19/2005 Sl812005 <br />STATION 30t <br />Flow Rate cfs 0.488 0.085 NF NF <br />Field Tem erature © 2 2 <br />H -field s.u. 8.1 8.1 <br />EC -field umhoslcm 100 200 <br />Oil & Grease NONE NONE <br />Settleable Solids mUUh <0.2 <br /> <br />STATION 302 <br />Flow Rate cfs NF NF NF NF <br /> <br />STATION 303 <br />Flow Rate cfs NF NF NF NF <br /> <br />STATION 304 <br />Flow Rate cfs 1.065 0.071 NF 0.101 <br />Field Tem erature © 3.0 2.0 15.0 <br />H -field s.u. 8.2 8.0 8.0 <br />EC - field umhoslcm 200 100 100.0 <br />Oil & Grease NONE NONE NONE <br />Settleable Solids mWh <0.2 <0,2 <br /> <br />Fee: can/zoos/zoos hyd~oi~y mt Page 13 <br />