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state Rea. <br />;.,.-.~Pa~~ in ZD5 concentrations of receiving surface waters are <br />Pxpec,'te[i. As discussed in the Seneca II Mine AHRs, sulfate is the <br />primary ionic contributor to increased 'IDS levels at the Seneca II <br />Mine. In fact, sulfate concentration increases are in direct <br />proportion to increases in 7DS concentrations as depicted in Figure <br />7-32. <br />Another important relationship which should be more fully appreciated <br />before attesting to evaluate arri predict water quality impacts to <br />GYassy and Fish (YeP]cs (Section VII.A.l.c.) is the relationship <br />between flow and 'IDS oonoentration. Zhe relationship between these <br />two parameters is illustrated in Figures 7-33 through 7-38 for Sites <br />NPDFS 002, 003, atld 004 arri SW-S2-1, 2, and 6, respectively. As is <br />well ]a~am aryl is clearly evident fran these figures, 'iDS <br />concentrations generally decrease with increase in flow. However, <br />this relationship is not as well defined or as predictable as is • _ <br />often cited in the literature. For e~mnq~le, upon wring NPDES 002 <br />data with that of SW-S2-1, both sites of which have shown relatively <br />little change in ZD6 wncentration over the past five years, a <br />decrease in ZDS concentration with an increase in flow is apparent at <br />NPDFS 002 but not at SW-S2-1. More importantly, at NPDFS 002, ADS <br />oor~centration decreases very little with relatively large increases <br />in flow. As a result, when salt loads are calculated and predicted <br />in Section VII.A.l.c., it is especially important to quantify as <br />accurately as possible the flow am~onent in the salt load <br />computations if the results are to be wnsidered realistic. If the <br />flow o~q~onent cannot be accurately quantified, then the flew <br />o~onent should be treated more or less as a constant in order that <br />charges in salt load due to minirg related water quality changes can <br />be qualitatively predicted. <br />For the four previously discu_~sed monitoring sites in GYassy and <br />Little CYassy Creeks, mean 1DS data were obtained from the past six • <br />years of record. The data for Sites SW-S2-1 aril 2 and NPDFS 002 and <br />003 are summarized on an annual basis in Arrpo„ri;x <br />7-209 Revised 10/17/94 <br />