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1 <br />Every year the dissolved solids gradually increase until the next spring runoff. <br />' The elevated dissolved solids levels appear be more influenced by spoil water than <br />mine discharge water as the seasonally high levels approach 3500 mg/L. The iron, <br />manganese and suspended solids levels did not exceed standards NPDES standards <br />during 1986. Also previous problems with silver appear to have been solved by <br />changing the location of the discharge point of the underground mine water to Pond <br />D and improving quality control at the laboratory. Summaries of the water quality <br />' data for Site 7 are presented on Tables 51 and 52 and on Figures 40 and 41. <br />Included in the data are three samples collected from the waste rock pond during <br />1986 while the pond was not discharging. The data indicates a gradual increase in <br />' dissolved solids from approximately 2800 mg/L in 1980 to approximately 3600 mg/L <br />in 1986. These changes do not appear to be the result of the underground mining <br />activities. The data also shows the typical seasonal variation due to the <br />diluting effects of the spring runoff. Suspended solids levels have been fairly <br />~- <br />' since 1980. <br /> <br /> <br /> <br />1 <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br />1 <br />