Laserfiche WebLink
Mr. David Berry <br />October 26, 1988 <br />Page 9 <br />CYVCC RESPONSE: <br />The data for Station 900 and 29 do not necessarily indicate an increasing <br />trend for conductivity because there were high levels in 1980 and 1985 <br />also. In addition, CYCC agrees with the Division that the relatively high <br />levels in 1987 may be due to the decreased flow rates. However, <br />irrespective of the relatively high conductivity levels, no material damage <br />is indicated. <br />CMLRD CONCERN: <br />General Content <br />Although the current report format is well organized and quite thorough, the <br />report would be enhanced by including graphs of both electrical conductivity <br />and total dissolved solids over time for all sites already depicted by <br />manganese, sulphate, zinc and cadmium are graphed against time for the <br />surface sites currently graphed in the AHR. <br />CYVCC RESPONSE: <br />Normally, it is not necessary to plot both dissolved solids and conductivity <br />because they typically measure the same thing. The preference is to plot <br />dissolved solids because, generally, it is more accurate than field <br />conductivity. However, when insufficient dissolved solids data are <br />available conductivities are plotted. For a discussion of the plotting of <br />iron, sulphate, zinc and cadmium concentrations please refer to General <br />Content responses in the AHR response for permit C-81-071. Finally, <br />manganese is not plotted because of insufficient data, and there is no <br />indication of manganese loading in discharges from Mine 3. <br />If I can be of further assistance, please contact me. <br />SinncerelAy-,/ <br />Richard Mills <br />Supervisor; Environmental Affairs <br />RAM:dg <br />