2014-03-18_REPORT - C1981010 (5)

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5.0 SURFACE -WATER QUALITY Samples were collected from active sites 001, 002, 011, 017, 018, 020 and S -1 during 2013. Analytical results for these surface water samples are presented in Table C -1 (page C -24). 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, 009, 019, 021, 022, 023 and 024 had no discharge during 2013 and, therefore, no data are presented. 5.1 TSS Figures C-4, C -6, C -8, C -10 and C -12 present plots of total suspended solids (TSS) versus time for the sites 001, 002, 011, 017, 018, 020, 021 and S -1. The 2013 TSS values were small and similar to the low range of previously observed values. S -1 TSS value was very small in 2013. Plots of flow versus TSS for the same sites are presented in Figures C -5, C -7, C -9, C -11 and C -13. 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 2013 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 2013 to the range observed over the previous few years (Figure C -14). The observed 2013 conductivity data plots within the historical range in conductivity for Johnson Gulch (00 1) for the low flow rates (Figure C -15). Figure C -16 presents conductivity concentrations versus time for NPDES site 002. The upper range in conductivity in 2011 through 2013 was slightly less than the upper range for the Trapper Mining Company 5 -1 2013 Annual Report