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previous few years. The range in the 2016 conductivity data was similar to the historical range for <br />low flow rates. Figure C-17 shows a good inverse relationship between flow and conductivity for the <br />data at this site. <br />The conductivity values for NPDES site 011 and 017 are shown Figure C-18, with values <br />from NPDES site 011 covering most of the historical range and no values from the NPDES site 017 <br />for 2016. Figure C-19 shows the 2016 conductivity values from site 011 exist in the upper half of the <br />previously observed conductivities. Figures C-20 and C-21 present the limited data that has been <br />collected at the NPDES 020 and 021 sites. <br />Conductivity of water for site S-1 has been fairly steady with time (Figure C-22). The 2016 <br />conductivity is within the range that has been defined at this site. Figure C-23 presents the <br />conductivity versus flow for the S-1 site. The conductivity measured in 2016 for the S-1 site is <br />within the range measured for this site. <br />TDS, conductivity and major constituents tend to increase as the ground -water contribution <br />becomes a larger portion of the flow. The values, in general, are within natural ranges but some <br />increase over baseline has likely occurred at NPDES site 001. No long-term trends are indicated by <br />the major constituents except for NPDES site 001, which may have stabilized after several years of <br />generally increasing. <br />5.3 OTHER CONSTITUENTS <br />Field pH values for all sites were very similar in 2016 to previous data. Values typically <br />ranged from near neutral to less than 9 for pH values at the surface water sites. Other constituents <br />analyzed showed little change with all minor constituents within their natural ranges. The 2016 total <br />aluminum value was similar to historical values for the Trapper surface water with a high of 0.77 <br />Trapper Mining Company 5-2 <br />2016 Annual Report <br />