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• band of TSS which does not relate to discharge. The retention of <br />water in the settling ponds has generally not allowed the TSS to <br />increase with increasing discharge as it would be expected under <br />natural conditions. <br />Figures C-16 and C-18 present the TSS values for NPDES sites 006 <br />and 008. Values for TSS for the 008 site during 1987 have been much <br />higher than normal. <br />5.2 TDS <br />TDS concentrations for site S1 have shown a rising trend since <br />1984 (see Figure C-20). Figure C-21 presents the flow versus TDS plot <br />for site S1. Figure C-22 presents a similar TDS plot to that of site <br />S1 for site S3. The flow versus TDS relationship is presented in <br />Figure C-23. The two TDS versus flow graphs show that, as flow <br />decreases, the TDS increases at both of these sites. The base flow <br />has been gradually declining the last few years, which has caused the <br />natural gradual rise in TDS. <br />The TDS concentrations versus time plot for site 001 show a <br />similar pattern during each year presented. TDS values typically are <br />lower during spring due to increased runoff and rise rapidly through <br />the year (see Figure C-24). No long-term trend seems to be occurring <br />in the Johnson Gulch runoff water quantity. <br />Figures C-26 and C-28 present TDS concentrations versus time for <br />sites 002 and 005. TDS values rose above the mean of 1400 mg/1 in <br />1987 for site 002 (No Name). The late 1987 value was more in line <br />with past concentrations. Site 005 TDS concentrations averaged <br />• approximately 700 mg/1 with the 1987 value slightly lower at 350 mg/1. <br />TDS concentrations for site 006 varied from 1370 mg/1 to 2170 <br />5-2 <br />