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• All zinc values are below the CDOH aquatic life limit of 0,05 mg/l. <br />The highest observed concentrations occurred during baseflow and the <br />lowest during peak runoff. <br />Middle Thompson Creek <br />Water quality samples have been collected on Middle Thompson Creek <br />since June 11, 1981 for four consecutive quarters. The same collec- <br />tion and preservatin methodology used on North Thompson Creek was used <br />on Middle Thompson Creek. <br />Figure 3.6.1.2-6 is <br />samples from the Ju <br />site. The figure <br />calcium-bicarbonate <br />quality from season <br />downstream site. <br />a trilinear diagram which presents plots of the <br />ne and December sampling episodes at the upstream <br />shows that the water, during both episodes, is <br />and that there is little variation in water <br />to season. This same pattern is observed at the <br />• When water quality data on the Middle Thompson Creek are compared to <br />the CDOH standards, all parameters monitored were below the standards <br />except copper. Figure 3.6.1.2-7 presents graphs of observed copper <br />values for each sampling episode. As the figure shows, the values are <br />sporadic and do not follow any pattern between stations. Although the <br />CDOH limits of 0.01 mgjl is exceeded on occasion, this is a natural <br />occurrence and can be contributed to the local coal formations and <br />tertiary intrusives. <br /> <br />3-B1 <br />