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<br />Mr. David Berry <br />October 4, 1988 <br />Page 16 <br />2. The data has been reviewed and CYCC's interpretation indicates that <br />high levels of cadmium are not typically reported for this station. <br />The change in the detection limit from 5 ug/1 to 0.1 ug/1 have shown <br />detects which were below the previous detection limit, but which are <br />consistentent with seasonal variation. <br />In reference to zinc, the concentration of zinc values for 1987 are <br />within the acceptable range of seasonal variation. <br />Trout Creek - <br />1. From CYCC's review of the data it appears the 1987 conductivity values <br />for Station 69 are consistent with previous data and the run off <br />pattern. Based upon the decreased runoff in 1987 the conductivity <br />levels at Station 69 do not appear to have increased relative to the <br />levels of the previous two years. <br />CMLRD CONCERN: <br />General Content <br />The current report format is well organized and quite thorough. The report <br />would be enhanced by including graphs of both electrical conductivity and <br />total dissolved solids over time for all sites already depicted by graphs. <br />It would also be helpful if such other parameters as iron, sulphate, zinc <br />and cadmium are graphed against time for the surface sites and the spring <br />sites currently graphed in the AHR. <br />CYVCC RESPONSE: <br />Normally, it is not necessary to plot both dissolved solids and conductivity <br />because both are measuring the same constituents. CYCC has opted to provide <br />plots of dissolved solids for the various stations. The concentration of <br />iron in either surface or ground water samples have not been an issue at <br />CYCC; and therefore, the data is not presented in a plot. Also, sulphate <br />tends to follow dissolved solidsfconductivity and is not plotted. In <br />reference to zinc, cadmium and other trace metal plots are not provided <br />because of the large number of analysis which are reported below the <br />detection limit. This data would tend to render the plots meaningless. <br />