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Dames & Moore, 1999 - USDA Forest Service

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TABLE 4.23<br />

SUMMARY OF CHARACTERISTICS AND EROSION POTENTIAL FOR TAILINGS PILES AND SLOPES<br />

HOLDEN MINE RllFS<br />

DAMES 8 MOORE JOB NO. 1769340501 9<br />

Tailings Location<br />

Tailings Pile 1<br />

Tailings Pile 2<br />

Tailings Pile 3<br />

Reach<br />

1-A<br />

1-Lt<br />

l-B..xt<br />

1 -C<br />

1 -D<br />

1 -E<br />

1 -F<br />

2-As<br />

2-An<br />

2-8<br />

2-C<br />

2-Dw*<br />

2-E<br />

2-F-a<br />

2-F.t<br />

3-A<br />

3-8<br />

3-C<br />

Approximate<br />

Length (ft)<br />

225<br />

175<br />

175<br />

200<br />

300<br />

210<br />

160<br />

210<br />

225<br />

350<br />

160<br />

350<br />

475<br />

760<br />

550<br />

435<br />

215<br />

Height Range<br />

(ft)<br />

5-10<br />

30-65<br />

50-65<br />

6065<br />

65-70<br />

68-72<br />

55-75<br />

5080<br />

80-1 10<br />

100-110<br />

105-115<br />

110-120<br />

120-125<br />

125-133<br />

50-55<br />

5060<br />

55-65<br />

60-65<br />

Average Range in<br />

Slope Angle Slope Angle<br />

Average Slope - estimated from the top of the slope to the mean elevation of the bottom of the rip rap.<br />

Range in Slope - the approximate range in slopes found vertically and laterally across the entire slope reach.<br />

Slope Setback: Yes' - Ihe slope is setback sufficiently from the lop of the riprap to allow for accumulation of talus at the angle of repose.<br />

Slope Setback: Uo" - the slope is setback sufliciently from the top of the rip-rap to allow for accumulation of talus at the angle of repose.<br />

Creek Setback: Yes" - Ihe main channel of the creek is setback significantly from the based the riprap.<br />

Creek Setback: Uo" - the main channel of the creek is at the base of the riprap.<br />

Present Erosion - see Table 4.2-3 (Em'on Polwrffal Ranking Criteria)<br />

> 33<br />

26.9<br />

35.9<br />

40.2<br />

40.2<br />

32.4<br />

30.2<br />

30.2<br />

31.3<br />

37.5<br />

38.7<br />

37.2<br />

39.0<br />

35.0<br />

40.2<br />

31.1<br />

35.2<br />

29.4<br />

3060<br />

25-75<br />

25-75<br />

25-80<br />

30-85<br />

25-75<br />

15-75<br />

20-90<br />

20-60<br />

30-60<br />

30-60<br />

10-50<br />

30-55<br />

30-60<br />

30-50<br />

33-50<br />

20-45<br />

15-32<br />

H:\Hotden\Drafl Final RI rpt\S-4\tables\4-2-3.xls<br />

711 6/99 Page 1 of t<br />

Slope<br />

Setback<br />

No<br />

Yes<br />

Yes<br />

No<br />

No<br />

No<br />

No<br />

No<br />

Yes<br />

No<br />

Yes<br />

Yes<br />

Slope<br />

Material<br />

No<br />

Yes<br />

Yes<br />

Yes<br />

Yes<br />

No<br />

Yes<br />

No<br />

No<br />

No<br />

No<br />

No<br />

Yes<br />

Yes<br />

No<br />

No<br />

Condition of<br />

Grass Mats<br />

None<br />

None<br />

None<br />

None<br />

None<br />

None<br />

None<br />

None<br />

G d<br />

Fair<br />

Poor<br />

Good<br />

None<br />

G d<br />

None<br />

None<br />

None<br />

None<br />

Observed<br />

Moderate<br />

Minor<br />

Minor<br />

Minor<br />

Minor<br />

Minor<br />

Minor<br />

Minor<br />

Moderate<br />

Moderate<br />

Extensive<br />

Moderate<br />

Moderate<br />

Moderate<br />

Moderate<br />

Minor<br />

None<br />

None<br />

Eroslon Potential<br />

High<br />

Moderately Low<br />

Moderate<br />

Moderate<br />

Moderate<br />

Moderately Low<br />

Moderately Low<br />

Moderately High<br />

High<br />

High<br />

Moderate<br />

Moderately High<br />

Moderately Hgh<br />

Moderately High<br />

Moderate<br />

Moderately Low<br />

Low

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