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Marr Mine - 2007 Annual Hydrology Report 7.0 LOADOUT AREA SURFACE WATER May 2007 Two Loadout surface water sites (319 and 320) were monitored weekly from March through June, then monthly through September, 2007. There was discharge from Site 320 beginning March 21 and ceasing in the end of June 2007 ranging from 0.5 to 2.0 cfs. No flow was observed after June 27, 2007 at Station 320 and there was no discharge in 2007 from Station 319. The sedimentation pond associated with Site 320 filled during spring runoff and retained water through September. Site monitoring locations are shown on Map 2, Loadout Area Monitoring Stations. As of January 1999, the monitoring program for surface discharge points (for the mine area) was reduced to monthly monitoring for a parameter list including flow, temperature, pH, settleable solids, and oil and grease. For Site 320, only the field measurements (flow, temperature and pH) are required for monitoring. This data is contained in Appendix A, 2007 Field Data. The historic flow data for the Loadout is presented on Table 11, Loadout Area Surface Water Quality Data. Figure 7, Loadout Station 320 - Historical Flow and pH, shows the variation in flow and associated pH reading at Station 320 for all historic flows measured since 2001. Surface water sites 316, 317, and 318 were dropped from monitoring as of October 1999. No data was collected from these sites during this water year. TABLE 11 - LOADOUT AREA SURFACE WATER QUALITY DATA 2007 3/21 3/27 413 4/23 517 5/13 5121 5/28 6/5 6/13 6118 6127' STATION 319 Flow Rate cfs NF NF NF NF NF NF NF NF NF NF NF NF Temperature H - field s.u. EC - field umhos/cm STATION 320 Flow Rate cfs 2.0 1.5 0.25 0.25 0.25 1.0 1.0 1.0 1.0 2.0 1.5 0.5 Temperature © 6.0 10 10 12 13 14 13 14 19 18 H -field s.u. 8.0 7.9 7.9 8.1 8.1 8.1 8.1 8.1 8.1 8.1 EC - field umhos/cm 400 400 500 450 450 400 470 450 450 475 NF = no flow 6371/2007/2007 hydrology rpt Page 17 i i I