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Dames & Moore, 1999 - USDA Forest Service

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(i,e., portal drainage) for cadmium, zinc and copper, which enter the creek as surface<br />

flows or seeps.<br />

a Additional source areas (waste rock piles and mill area) are not significant load sources in<br />

the spring and generally contribute no load in the fall unless a precipitation event occurs.<br />

a The sediments sampled both in Railroad Creek (above, adjacent, and downstream of the<br />

Site) as well as Lake Chelan (at Lucerne bar and the mouth of the Stehekin River)<br />

indicate similar concentrations of metals, except for copper and zinc which are slightly<br />

elevated (approximately twefold) when compared to the upstream and reference sites.<br />

However, the copper and zinc are anticipated to be present in the relatively inert stable<br />

iron oxyhydroxide precipitates due, to the neutrd pH in both Railroad Creek and Lake<br />

Chelan.<br />

\U)M-SEAI\VOLI\COMMOMWP\*~~~~~~\~~M)~Q~ 6-53<br />

1169MOU)19Uuly 27.<strong>1999</strong>,4:11 PM;DRAFT FINAL RI REPORT

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