2007-03-16_REPORT - C1981010 (11)

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5.2 CONDUCTIVITY The conductivity versus time plot for site NPDES 001 shows a similar, but slightly higher, range of conductivity in 1998 through 2006 to the range observed over the previous few years (Figure C -15). The 2006 data was slightly less than the maximum observed historical conductivity from NPDES site 001 (Figure C -16). The observed 2006 conductivity data generally plots in the upper half of the range in conductivity for Johnson Gulch (001) for the low flow rates. Figure C -17 presents conductivity concentrations versus time for NPDES site 002. The upper range in conductivity in 2006 was similar to the upper range for the previous few years. The range in the 2006 conductivity data was similar to the historical range for low flow rates. Figure C- 18 shows a good inverse relationship between flow and conductivity for the data at this site with the two higher flows measured in 2006 having lower conductivities as has been historical observed. The conductivity values for NPDES site 011 was measured three times in 2006 (Figure C- 19), with values covering most of the historical range. Figure C -20 shows four 2006 conductivity values from site 011. Figures C -21 and C -22 present conductivity versus time and conductivity versus flow for NPDES sites 020 and 021. The conductivities measured in 2006 for site 020 were lower than most of the 2006 values for site 021. The 2006 conductivities for site 020 were within the historical range while some 2006 values for site 021 were slightly higher than its historical values. Additional years of data are needed to define the band of conductivities for these two sites. Conductivity of water for site S -1 had been fairly steady with time (Figure C -23). The 2006 conductivity is within the range that has been defined at this site. Figure C -24 presents the conductivity versus flow for the S -1 site. Trapper Mining Company 5 -2 2006 Annual Report