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<br />Ms. L. Potter <br />April 22, 1999 <br />Page 3 <br /> <br />depletions due to the pumping, and evaluate the impacts of the pumping on manganese (as well as <br />other parameters) on the Rito Seco between the West Pit and the downstream augmentation point. <br />Page 68, Section 6.2.1 <br />Issues associated with sizing, life span, disposal, and replacement of the "passive water treatment <br />systems" need to quantified. High O & M systems are not in the interest of anyone. <br />Page 73, First Paragraph <br />We recommend that a continuous gaging station be installed at one of the downstream surface <br />water monitoring stations (e.g., RS-5). In addition to continuous flow measurements, this station <br />should be equipped with instruments to monitor pH and specific conductance. The "spiky" nature <br />exhibited by the manganese and sulfate concentrations at RS-5 (see Figure 3-6) suggest that some <br />exceedences may be short in duration. This raises the issue of whether the samples collected <br />represent the maximum values for a specific event. <br />Continuous monitoring data would help define the duration of the exceedences and establish the <br />flow conditions associated with these high concentrations. This information could then be used to <br />refine the long-term monitoring program. <br />Page 74, Second Bullet <br />'~ Averaging of pH data can not be performed, as pH is a log transformed parameter. <br />"Y <br />Figure 2-1 <br />Do precipitation data prior to 1992 exist? The precipitation (and stream flow) data are critical to <br />understanding the high manganese and sulfate data points shown on the subsequent Figure 3-6. <br />Figure 3-6 <br />To the extent practical, the y-scales should be the same on the graphs to facilitate comparison of the <br />data. Specifically, the manganese scales for RS-2 and RS-3 could be the same, and the sulfate scales <br />for RS-2, RS-3, and RS-5 could be the same. <br />,~ ~,~ ~ The RS-5 graph is too cluttered. Separate manganese and sulfate graphs should be prepared. <br />Are flow data available for these stations? Including flow data on these types of graphs is often very <br />helpful. <br />Appendix D, Page 18, Section 2.6.2 <br />l~~ Should mule deer have been identified as a receptor species instead of white-tailed deer? <br />