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4.0 SURFACE WATER MONITORINQ RESULTS <br />Table 1 shows the currently approved surface water monitoring requirements during the 1994-1995 <br />water year. There are seven non-NPDES surface water monitoring stations inGuding three in New <br />Horizon 1 (Tuttle Draw) and four in New Horizon 2 (two in Calamity Draw and two in West lateral <br />Ditch). <br />4.1 Surface Water MonltOrtng <br />Appendix D contains the flow and quality data for the surface water stations monitored during this <br />~ water year. All quality parameters measured at New Horizon 1 and New Horizon 2 were within <br />~ historic ranges. Surface water sampling at New Horizon 2 commenced as per the monitoring <br />' requirements in May 1993. <br />4.2 NPDES Discharge Monitoring <br />Appendix E contains the flow and quality data for the seven NPDES discharge points. During this <br />monitoring period only NPDES 001 (Pond 001) had discharges at New Horizon 1. There were no <br />discharges from Ponds 002, 003, 004, 005 and 006. Discharges from NPDES 007 (Pond 007) at <br />New Horizon 2 began on May 19, 1993. This discharge paint is also designated as surface water <br />monitoring site SW-N102. Approximately 206 acre-feet were discharged from 001 during the water <br />year. Approximately 330 acre-feet were discharged from 007 during the water year. All NPDES <br />discharges were within effluent limitations. Other quality parameters were within historic ranges. <br />4.3 Whole Toxicity Testing (WET) <br />New Horizon Mine conducts whole toxicity testing of water discharged from Pond 001 on an annual <br />basis, and from Pond 007 on a quarterly basis. The test species are fathead minnows and <br />ceriodaphnia. Pond 001 water has shown no toxicity to these species. Pond 007 water has shown <br />no toxicity to fathead minnows; however, occasionally the water was found to be toxic to <br />ceriodaphnia. The toxicity was not found during subsequent accelerated testing. <br />10 <br />