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5.2 CONDUC'T'IVITY <br />The conductivity versus time plot for site NPDE5 001 shows a similar, but slightly higher, <br />range of conductivity in 1998 through 2005 to the range observed over the previous few years (Figure <br />C-15). The 2005 data was similaz to the maximum observed historical conductivity from NPDES <br />site 001 (Figure C-16). The observed 2005 conductivity data generally plots in the upper half of the <br />range in conductivity for Johnson Gulch (001) for the low flow rates. <br />Figure C-17 presents conductivity concentrations versus time for NPDES site 002. The <br />upper range in conductivity in 2005 was similaz to the upper range for the previous few years. The <br />range in the 2005 conductivity data was similaz to the historical range for low flow rates. Figure C- <br />18 shows a good inverse relationship between flow and conductivity for the data at this site with the <br />low flows measured in 2005 having similaz conductivities to those historical observed. <br />The conductivity values for NPDES site 011 was measured four times in 2005 (Figure C-19), <br />with values covering most of the historical range. Figure C-20 shows four 2005 conductivity values <br />from site 011. Figures C-21 and C-22 present conductivity versus time and conductivity versus flow <br />for NPDES sites 020 and 021. The conductivities measured in 2005 for site 020 were lower than <br />most of the 2004 values, while the 2005 conductivities for site 021 in 2005 were generally neaz its <br />historical upper range. Additional years of data aze needed to define the band of conductivities for <br />these two sites. <br />Conductivity of water for site S-1 had been fairly steady with time (Figure C-23). The 2005 <br />conductivity is within the range that has been defined at this site. Figure C-24 presents the <br />conductivity versus flow for the S-1 site. <br />Trapper Mining Company 5-2 <br />2005 Annual Report <br />u <br />