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Dames & Moore, 1999 - USDA Forest Service

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Hydrostratigraphic<br />

Unit<br />

SoilIFill<br />

Colluvium<br />

Tailings<br />

Waste Rock<br />

Distribution<br />

West portion site, SP-<br />

5 area<br />

North of Railroad<br />

Creek, beneath TP3<br />

TP I. TP2. TP3<br />

Eastlwest of mill<br />

building<br />

Alluvium<br />

Underneathladjacent<br />

to Railroad Creek<br />

Alluviurn~reworked till South of Railroad<br />

Creek<br />

Dense Till<br />

Entire site<br />

Bedrock<br />

Entire site<br />

Refer to text for sources of hydraulic conductivity values<br />

G:\WPDATA\OOSREPORTS\HOLDEN-Z\R1\4-O.DOC<br />

17693-005-019Uuly 19. <strong>1999</strong>:4:51 PM;DRAm FINAL RI REPORT<br />

TABLE 4.4-1<br />

HYDROSTRATIGRAPHIC UNITS<br />

Thickness<br />

(fi)<br />

0-10<br />

25-40+<br />

10-120<br />

10-70<br />

5-25<br />

5-10?<br />

5-95<br />

12- 140<br />

(depth to<br />

bedrock)<br />

Lithology1<br />

Grain Size<br />

Clay-boulder, w~th<br />

branches/stumps<br />

Silt-boulder<br />

Clayey silt-sand<br />

Sand-cobble<br />

Silt-cobble<br />

Silt-gravel<br />

Clay-boulder<br />

Quartz diorite.<br />

granodiorite. schist.<br />

gneiss<br />

Hydraulic Conductivity<br />

(cmlsec)*<br />

Small where fine-grained or<br />

compact large where large-grained<br />

or poorly sorted<br />

1.2 x 10"to 4.6 x 10"<br />

4.4 x 10" to 2.0 x lo4<br />

Estimated at >I x 10"<br />

Large due to large grain size and<br />

poor sorting<br />

1.8~ IO" to7.2~ lo-'<br />

5.3 x lUL to 9.0 x 10-<br />

I x 10-'to l x IV'" (unfractured)<br />

4.7 x 10 -' to 9.3 x 10" (fractured)<br />

1.3 x I0 -' to 2.3 x 10"~<br />

(unfractured)<br />

Permeability<br />

TY pe<br />

Intergranularldi<br />

scontinuity<br />

Intergranular<br />

Intergranular<br />

lntergranular<br />

Intergranular<br />

Intergranular<br />

Fracture<br />

Fracture

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