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October 29, 1992 <br />Pepa 4 <br />DOMG Response <br />11) Logarithm scales are used for the Y axis on Figure 41 and <br />Figure 51. What information is TCC attempting to convey to the <br />reviewer? Anomalously high values should not be used to set the <br />scale for graphical representation of data, particularly by using <br />a semi-log format. <br />TCC Response <br />The use of a log scale is necessitated in Figure 41 by the presence <br />of the surface site discharge information (greater than 10 cfs in <br />spring) in conjunction with the presence of 115 and 109 discharge <br />information (typically less than 1 cfs). Use of any other scaling <br />system would render some portion of the graph unavailable to the <br />reader, as flows would either be off scale or undetectable, due to <br />the difference in magnitude between the sites being compared. <br />Similarly, Figure 51 is a graphical representation of iron values <br />for the pond and springs at the Fish Creek Tipple for period of <br />record. Use of a different scale would again render portions of the <br />data either unavailable or unreadable. Please note that anomalously <br />high values were not utilized to set the scale in either instance; <br />rather, these scales are necessitated by the type of information <br />being conveyed. <br />DOMG Concern <br />12) Figure 27 is labelled as 1990 water year data. <br />