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5.0 SURFACE -WATER QUALITY <br />Samples were collected from active sites 001, 002, 011, 020, 022 and S-1 during 2017. <br />Analytical results for these surface water samples are presented in Table C-1 (page C-24). The more <br />frequently measured parameters are presented with the first series of values. The less frequent <br />measured parameters are in two separate groups and shown after the first group of parameters in <br />Table C-1. NPDES sites 008, 009, 017, 018, 019, 021, 023 and 024 had no discharge during 2017 <br />and, therefore, no 2017 water quality data is presented. <br />5.1 TSS <br />Figures C-4, C-6, C-8, C-10 and C-12 present plots of total suspended solids (TSS) versus <br />time for the sites 001, 002, 011, 017, 020, 022 and S-1. The 2017 TSS values were small and similar <br />to the low range of previously observed values with a higher value from the higher flow in 020 in <br />October. S-1 TSS value was very small in 2017. Plots of flow versus TSS for the same sites are <br />presented in Figures C-5, C-7, C-9, C-11 and C-13. As expected, a general increase in TSS for an <br />increase in flow is seen in these plots for the historical data from these sites with the 2017 data <br />supporting the historical relationship between flow and TSS. <br />5.2 CONDUCTIVITY <br />The conductivity versus time plot for site NPDES 001 shows a similar, but slightly higher, <br />range of conductivity in 1998 through 2017 to the range observed over the previous few years <br />(Figure C-14). The observed 2017 conductivity data plots within the historical range in conductivity <br />for Johnson Gulch (00 1) for the low flow rates (Figure C-15). <br />Trapper Mining Company 5-1 <br />2017 Annual Report <br />