Geological Report.pdf

9360 Glacier Hwy., Suite 1 Juneau, Alaska

July 9, 2020 .12

250 Street , Alaska, 99503

Site

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Introduction – Site Conditions:

y

; ’s in situ . T is ily surface at - plates. T -f 10- fi tunnel transects el Anan Creek, tra Anan Creek upstr structure.

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n. is r fr , Page 2 Anan Bear Observatory Reconstruction July 9, 2020 Geological Site Investigation

- ass is ly uplift ’s surface, release tensile stresses p surface. C nifest in erns wi t Creek. , flat terrain.

Rock Type and Rock Mass:

was s , ite/ te.

sets, e a at Anan Creek e s r

15- s appears ; w , uate retai .

e, cliff face, resultin release surface its release -

Rock Mass Observations:

s . T lists

-site

1. racture

2. racture

3. racture persistence ( l c acture racture aperture, ( surfaces

5. racture type

6. R

8. W

9. W , ’

10. W fractures

11. tence surfaces

Page 3 Anan Bear Observatory Reconstruction fracture traces s-fracture le, a fracture surface a was -cut a separate fracture 3 rees a ne .

s articu fractures s cut . fracture spaci .

r accu s s, can at least

, trace fracture w n separate an apparent a int se -lity issues particularly ep cliffs.

acture surfaces typically ;

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ts. ears s intact wi , ’s e Alaska

) Alaska Field Rock Classification and Structural Mapping Guide. rial is R5, Very

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surface planes.

Al ter- -cut earlier- ractures. aces were -swell lenses,

- , typicall ss . was was result , east-west steeply , . A cial ice es ri .

were lat itself

Geologic Hazards:

i fracture s s fracture cliff faces cycles fracture surfaces. ese will caus i r faces.

can ale an .

at site appears t Anan Creek cliff faces w

Page 4 Anan Bear Observatory Reconstruction

- w , Recommendations:

1. crystalline .

2.

In 80 crystalline r psf.

3. n , c e r . s si.

, . 250 psi

, any l n re er ste face, spiral staircas ck s future

5. can fractures w es. ew r pr . s use ne r r

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6. , it is ert ential u te y , t al int

8. site al ass a ref ese

Page 5 Anan Bear Observatory Reconstruction will nificant c t wit n . wil w

. al/ essential rk f s e . at re -ully t . If nal , please fee

Sincerely, Mark .

Seni er

, al

7-9-2020

Appendix A

APPENDIX A

Vicinity Map, Existing Conditions, Site Profile and Site Section Drawings

SOUTHEAST

ALASKA

ALASKA

LOCATION

MAP

VICINITY MAP

JUNEAU

SOUTHEAST

ALASKA

GRAHAM

ISLAND

CANADA

UNITED STATES

THIS

PROJECT

TOPOGRAPHY FROM:

A

B

60 FT.

SCALE IN FEET

0 30

NORTH

EXISTING CONDITIONS

CREEK

ANAN

OBSERVATION PLATFORM

FISH PASSAGE TUNNEL

BELOW SURFACE

OBSERVATORY

SURFACE

STRUCTURES

GRAVEL

PATHWAY

STREAM BANK

SHOWN

APPROXIMATE

TUNNEL ENTRANCE

TIMBER STAIRWAY

EXPOSED GRANITE

ROCK KNOB

COLLUVIAL GRANITE

BOULDERS ALONG

STREAM BANK, TYP.

PROJECT

LOCATION

TOPOGRAPHY FROM R&M ENGINEERING-KETCHIKAN, INC., 2020

VI

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Appendix B

APPENDIX B

Site Photographs

View looking southwest into Anan Creek Lagoon.

Anan Creek is seen draining into tidewater over exposed and highly fractured, massive granite.

Photo 2:

Complex fracture patterns seen in exposed granite at the mouth of Anan Lagoon.

Photo 3:

Exposed granite seen below a windblown tree root plate alongside Anan Creek.

Photo 4:

TYPICAL

FRACTURE

PLANES EXPOSED

MASSIVE

GRANITE

View of the Observatory boardwalk with an exposed granite cliffside in the background.

Photo 5:

View looking downstream along Anan Creek. The blocky-shaped, granitic boulder deposits seen here are typical for the area.

Photo 6:

Anan Creek cuts through a mass of granitic bedrock at tidewater of Bradfield Canal.

Photo 1:

TYPICAL

FRACTURE

PLANES

EXPOSED

GRANITIC

BEDROCK

Tools of the trade: hammer, pick, brunton compass, headlamp and chest waders.

Photo 10:

View looking into the fish passage tunnel from atop the bear observatory platform.

Photo 9:

FRACTURES

OBSERVED

ON TUNNEL

WALLS AND

BACK

View looking south across Anan Creek from project site at an exposed mass of highly fractured, massive granite.

Photo 7:

View looking east and across Anan Creek from project site at the same exposed, highly fractured mass of granitic bedrock.

Photo 8:

TYPICAL

FRACTURE

PLANES

TYPICAL

FRACTURE

PLANES