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Dames & Moore, 1999 - USDA Forest Service

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In the fall, groundwater flow is reduced and flows in a more northeasterly direction, indicating less input<br />

from valley side slopes and more influence from the downvalley groundwater flow component (Figure 6.5-<br />

8). Seep discharge was not observed, but the movement of groundwater through the abandoned Railroad<br />

Creek channel presumably continues.<br />

Waste Rock Leachate Chemistry<br />

The chemistry of waters seeping from the vicinity of the waste rock piles is very similar to the P-1<br />

discharge and the mill building when considering ratios of key elements. The main feature of the waters,<br />

as measured at SP-8, SP-15, and SP-14 (lower) are that they contain relatively high copper and zinc to<br />

sulfate ratios (0.1 movmol) and low iron to sulfate ratios (40" moYmol) when compared to the tailings<br />

pile seepage (e.g., SP-2, SP-3, SP-4 and SP-5) (CdS04 ~n/~04

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