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r• <br /> few years (Figure C-15). The majority of the data in the flow versus conductivity plot for • <br /> NPDES site 001 shows the expected relationship of decrease in conductivity for increase in <br /> flow (Figure C-16). The observed 1999 conductivity data generally plots at a slightly <br /> higher conductivity than that observed in previous years in Johnson Gulch (001) for the <br /> low flow rates. This plot shows that some of the low flow conductivities at 001 have <br /> exceeded previous observed values. <br /> Figure C-17 presents conductivity concentrations versus time for NPDES site 002. <br /> As seen in previous years, there is a decrease in conductivity in spring due to increased <br /> runoff, and then conductivity rises when the flow decreases. This decrease was not as <br /> much as previous years due to the lower flow rates. The range in 1999 conductivities are <br /> very similar to the range observed in previous years. Figure C-18 shows a good inverse <br /> relationship between flow and conductivity for the data at this site. • <br /> The conductivity values for NPDES sites 011 and 013 range from approximately 500 <br /> to 2000 µmhos/cm (Figure C-19), except for a few larger values from site 011 in 1998 and <br /> 1999. These larger values may be caused by the flow of the backfill aquifer water into the <br /> Pyeatt Gulch alluvium. Figure C-20 shows that the few 1999 higher conductivities from site <br /> 011 are during low flow conditions as were the few higher 1998 values. Figures C-21 and <br /> C-22 present conductivity versus time and conductivity versus flow for NPDES site 017. <br /> The limited 1999 data for site 017 is similar to the limited data obtained at this site. <br /> Conductivity of water for site S-1 had been fairly steady with time (Figure C-23). <br /> The average data for the last three years are less than the average for the previous period <br /> for the S-1 site. TDS, conductivity and major constituents tend to increase as the ground- <br /> water contribution becomes a larger portion of the flow. The values, in general, are within , <br /> 5-2 <br />