2013-03-14_REPORT - C1981010 (7)

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5.0 SURFACE -WATER QUALITY Samples were collected from active sites 001, 002, 005, 011, 013, 014, 015, 017, 018, 020, 021 and S -1 during 2012. Analytical results for these surface water samples are presented in Table C -1 (page C -29). The more frequently measured parameters are presented with the first series of values. The less frequent measured parameters are in two separate groups and shown after the first group of parameters in Table C -1. NPDES sites 008, 012, 016, 019, 022, 023 and 024 had no discharge during 2012 and, therefore, no data are presented. 5.1 TSS Figures C -5, C -7, C -9, C -11, C -13 and C -15 present plots of total suspended solids (TSS) versus time for the sites 001, 002, 011, 017, 013, 018, 020, 021 and S -1. The 2012 TSS values were small and similar to the low range of previously observed values except for the higher TSS values with the large flow for NPDES site 021 (see Figure C -14). Figure C -9 shows that the 2012 values were consistent with the past values for sites 011 and 017. S -1 TSS value was very small in 2012. Plots of flow versus TSS for the same sites are presented in Figures C -6, C -8, C -10, C -12, C -14 and C -16. As expected, a general increase in TSS for an increase in flow is seen in these plots for the historical data from these sites with the 2012 data supporting the historical relationship between flow and TSS. 5.2 CONDUCTIVITY The conductivity versus time plot for site NPDES 001 shows a similar, but slightly higher, range of conductivity in 1998 through 2012 to the range observed over the previous few years (Figure Trapper Mining Company 5 -1 2012 Annual Report