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RULE 2 - PERMITS <br />Spoil Spring and Spring/Seep Water Quality <br />• Table 2.04.7 -T7.1 summarizes the water quality params for spoil springs, and Table 2.04.7 -T7.2 <br />presents the monitoring data for other (non - spoil) springs and seeps identified in the August 2009 <br />spring and seep inventory. Trilinear diagrams for spoil springs are shown on Figure 2.04.7 -F19.5 <br />through Figure 2.04.7 419.9. Those for springs and seeps sampled in August 2009 are shown on <br />Figure 2.04.7- F19.10 through Figure 2.04.7- F19.13. <br />Four of the five spoil springs had calcium- magnesium cations, mixed anions (chloride-sulfate - <br />bicarbonate), and high TDS levels of approximately 4000 mg/L. Spoil spring SSSPG6 differed from <br />the rest in that samples had chloride - sulfate anions, and lower TDS ( <2,800 mg/L) than the other four <br />spoil springs. Natural (non - spoil) springs /seeps typically had calcium- magnesium or calcium- sodium <br />cations, and chloride- sulfate or mixed anions, with variable TDS ranging from 430 mg/L at CSPG2 to <br />2920 mg/L at CSPG5. Water quality statistics for the springs monitored previously at the Yoast Mine <br />(YSPG6, YSPG7, and YSPG8) are provided in Exhibit 2.04.7 -E1, Hydrologic Information. YSPG6 <br />exhibited a magnesium- calcium - bicarbonate - sulfate water with an average TDS of 1260 mg/L. <br />YSPG8 exhibited a calcium - magnesium - bicarbonate- sulfate water with an average TDS of 730 mg/L. <br />YSPG7 exhibited water dominated by sodium - calcium- magnesium cations and sulfate as the dominant <br />anion. TDS averaged 1543 mg/L at YSPG7. <br />• <br />• <br />PSCM Permit App. 2.04 -86 Revision 12/17/09 <br />