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i • <br />of 106 mg/1 for Aprlil 2, 1991. Site 010 had a flow of 1.3.46 gpm <br />I <br />and an associated T'SS value of 390 mg/1, also on April 2. 1991. <br />The last flow recorded at site 008 was ,June of 1987, and 1991 was <br />the first time site 010 has had any flow. Due to limited data for <br />these sites, no plots of TSS versus time nor flow versus TSS are <br />presented. <br />5.2 CONDUCTIVITY <br />Conductivity of water for site SL has beer. fairly steady in <br />1991 (Figure C-11). The base flow has been gradually declining the <br />last few years. which has caused a natural gradual rise in <br />conductivity, altho~zgh the three data points from 1991 do not vary <br />much from the value recorded late in 1990. • <br />The conductivity versus time plot for site NPDES 001 shows an <br />overall increasing trend in 1991. Conductivities typically are <br />lower during Spring due to increased runoff and rise rapidly after <br />the spring melt (Figure C-12). The flow versus conductivity plot <br />for NPDES site @@1. shows a relationship between the flow and <br />conductivity (Figu:^e C-13). No long-term trend seems to be <br />or_curring in Johnson Gulch runoff water quality. <br />Figure C-14 presents conductivity concentrations versus time <br />for NPDES site 002. As seen in previous years, there is a decrease <br />in conductivity iri Spring due to increased runoff, and then <br />r_onductivity rises 'sharply when the flew decreases. Figure C-15 <br />shows a good relationship between flow and conductivity for this <br />site. • <br />5-2 <br />