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Dames & Moore, 1999 - USDA Forest Service

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other mine sites where plants &re successfully growing, only copper concentration in<br />

subsurface soils, the lagoon, and maintenance yard may present a risk of phytotoxici~.<br />

Earthworms may be at risk from cadmium. copper, lead andlor zinc in surface and<br />

subsurface soils at Holden Village, tailings piles, dust, lagoon and the Maintenance Yard<br />

under the worst-case scenario; however, suitable earthworm habitat may not exist due to the<br />

physical qualities of the substrate at the sample locations.<br />

Robins could be at risk from cadmium in the subsurface tailings, lagoon and maintenance<br />

yard, and from zinc in the subsurface soils, tailings pile 3, the lagoon and the maintenance<br />

yard, and from lead in the lagoon and maintenance yard based on the worst-case scenario.<br />

However, under the reasonable scenario (median concentration), there was no risk from<br />

cadmium or zinc. It is highly likely that the input parameters for the robin, overestimate the<br />

actual exposure conditions because a risk was also shown for robins feeding on earthworms<br />

exposed to background concentrations of cadmium and the exposure assessment does not<br />

account for the robins relatively large forage range.<br />

Under normally expected condition, there is no risk due to metals toxicity to mammals<br />

associated with terrestrial habitat near Holden Mine.<br />

~:\~~\00~~\holdn-2\ri\f4.d0~<br />

17693405419Uuly 27.<strong>1999</strong>;5:16 PMPRAFT FINAL RI REPORT

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