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350 <br />300 <br />250 <br />a� <br />F <br />a 200 <br />0 <br />U) <br />a <br />a� <br />ch 150 <br />0 <br />m <br />0 <br />H <br />100 <br />50 <br />0 <br />Figure 3 -2 <br />PRS-4 Surface Water <br />Middle Fork Downstream of Mine <br />19921993199419951996199719981999200020012002200320042005200620072008200920102011201220132014 <br />Year <br />—� PRS -4 <br />Linear (PRS -4) <br />