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Dames & Moore, 1999 - USDA Forest Service

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Above Tenmile Creek Confluence (RC-5)<br />

The RC-5 sampling station was located approximately 500 ,meters downstream of tailings pile 3,<br />

immediately upstream of the Tenmile Creek confluence. The amount of iron-oxide staining and flocculent<br />

affects was less than observed at RC-7.<br />

The average total number of benthic macroinvertebrates collected in the eight replicate samples was 52 per<br />

square meter. The actual values in the replicate samples ranged from 20 per square meter to 150 per square<br />

meter.<br />

The total calculated number of fish caught at RC-5 was 20 per hectare, and exclusively cutthroat trout. The<br />

fish length ranged fiom approximately 180 to 2 15 millimeters.<br />

Sevenmile Creek Confluence (RC- 10)<br />

The RC-I0 station was located approximately 5 kilometers downstream of tailings pile 3, near the<br />

confluence of Sevenmile Creek. Iron-oxide staining was noticeable at this sampling site; however, no<br />

indications of a iron-oxide flocculent were noted at the time of sampling.<br />

The average total number of benthic macroinvertebrates collected in the eight replicate samples was 75 per<br />

square meter. The actual values in the replicate samples ranged from 20 per square meter to 1 10 per square<br />

meter.<br />

The total calculated number of fish caught at RC- I0 was 153 per hectare, and exclusively cutthroat trout.<br />

The fish length ranged fiom approximately 30 to 200 millimeters. The smaller fish were "first of the year"<br />

which are normally more sensitive to toxicity than larger fish.<br />

Approximately 100 Meters Upstream of Mouth (RC-3)<br />

The RC-3 station was located approximately 100 meters upstream of the mouth of Railroad Creek.<br />

The average total number of benthic macroinvertebrate populations collected in the eight replicate samples<br />

was 381 per square meter. The actual values in the replicate samples ranged from 210 per square meter to<br />

540 per square meter.<br />

The total calculated number of fish caught at RC-3 were 153 per hectare. The species of fish caught<br />

included cutthroat trout and sculpin. The length of cutthroat was approximately 110 millimeters. Isolated<br />

pockets of gravel potentially suitable as spawning habitat were observed; however, the areas were<br />

considered small and marginal for use during spawning.<br />

Even though the RC-3 station provided limited habitat for spawning, Kokanee salmon were observed<br />

spawning throughout the reach. Salmon are not allowed to be caught when spawning. Consequently, the<br />

number and sizes of salmon in this reach could not be determined for the aquatic survey.<br />

1769~-0051)19~ul~ 28. <strong>1999</strong>;10:24 AM;DRAFT FINAL'RI REPORT

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