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Marr Mine - 2005 Annual Hydrology Report <br />7.0 LOADOUT AREA SURFACE WATER <br />February 2006 <br />Two Loadout surface water sites (319 and 320) were monitored weekly from March through June, <br />then monthly through September, 2005. There was no recorded discharge from Site 319. There <br />was discharge from Site 320 from April 25 to June 30, 2005 ranging from 0.5 to 2.5 cfs. The 2.5 <br />cfs reading was the highest flow historically recorded for this site. No flow was observed after <br />June 30, 2005 at Station 320. The sedimentation pond associated with Site 320 filled during <br />spring runoff and retained some water through September. Site monitoring locations are shown <br />on Map 2, Loadout Area Monitoring Stations. <br />As of January 1999, the monitoring program for surtace discharge points (for the mine area) was <br />reduced to monthly monitoring for a parameter list inGuding flow, temperature, pH, settleable <br />solids, and oil and grease. For Site 320, only the field measurements (flow, temperature and pH) <br />are required for monitoring. This data is contained in Appendix A, 2005 Field Data. The historic <br />flow data for the Loadout is presented on Table 11, Loadout Area Surface Water Quality Data. <br />Figure 7, Loadout Station 320 -Historical Flow and pH, shows the variation in flow and <br />associated pH reading at Station 320 for all historic flows measured since 2001. <br />Surface water sites 316, 317, and 318 were dropped from monitoring as of Qctober 1999. No <br />data was collected from these sites during the 2004 water year. <br />TABLE 11 - LOADOUT AREA SURFACE WATER QUALITY DATA <br /> 4/25/05 5/18!05 5/26105 5/31/05 6/8/05 8!15/05 6/23/05 8/30/05 <br />STATION 319 <br />Flow Rate cfs NF NF NF NF NF NF NF NF <br /> <br />STATION 320 <br />Flow Rate cis 0.5 1.5 2.0 2.0 2.5 1.5 2.0 2.0 <br />Field Tem erature © 8.0 12.0 14.0 12.0 13.0 17.0 19.0 19.0 <br />H -field s. u. 6.0 8.1 7.9 B.0 8.0 8.0 8.1 8.0 <br />EC-field umhos/cm 100 10D 100 100.0 100 100 100.0 100 <br />NF = No Flow <br />Note: No Flows on dates not shown <br />File: 6371/2005/Z(IDS hydmlogy apt Page 15 <br />