Laserfiche WebLink
C -17). The observed 2012 conductivity data plots within the historical range in conductivity for <br />Johnson Gulch (001) for the low flow rates (Figure C -18). <br />Figure C -19 presents conductivity concentrations versus time for NPDES site 002. The <br />upper range in conductivity in 2011 and 2012 was slightly less than the upper range for the previous <br />few years. The range in the 2012 conductivity data was similar to the historical range for low flow <br />rate. Figure C -20 shows a good inverse relationship between flow and conductivity for the data at <br />this site. <br />The conductivity values for NPDES site 011 and 017 are shown Figure C -21, with values <br />from NPDES site 011 covering most of the historical range and only one low value from the NPDES <br />site 017 for 2012. Figure C -22 shows the 2012 conductivity values from site 011 exist in the upper <br />half of the previously observed conductivities. Figures C -23 and C -24 present the limited data that <br />has been collected at the NPDES 013 and 018 sites. Figures C -25 and C -26 present conductivity <br />versus time and conductivity versus flow for NPDES sites 020 and 021. The conductivities <br />measured in 2012 for site 020 were similar to the historical values at low flow. The 2012 <br />conductivities for site 021 are within the historical range for the flow values observed in 2012. <br />Conductivity of water for site S -1 has been fairly steady with time (Figure C -27). The 2012 <br />conductivity is within the range that has been defined at this site. Figure C -28 presents the <br />conductivity versus flow for the S -1 site. The conductivity measured in 2012 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 />Trapper Mining Company 5 -2 <br />2012 Annual Report <br />