Attachment7.pdf
PDF 2 MB Posted
- Solicitation number
- 1240BH23R0025
- Issued by
-
Department of Agriculture Forest Service
About this file
This geological site investigation report describes conditions at the Anan Bear Observatory Reconstruction project site in Alaska. The granitic bedrock is highly fractured with complex fracture patterns. Notable features include exposed granite cliffs along Anan Creek, colluvial granitic boulders at the stream bank, and fractures observed on tunnel walls. The report recommends designs able to withstand seismic activity and shifting fractured bedrock, including reinforced concrete footings rated for at least 250 psi. Staircases and pathways should be designed to accommodate future rock displacement.
The related federal contract opportunity is a solicitation for the GAOA Anan Wildlife Observatory Reconstruction Phase 2 project. The Department of Agriculture Forest Service is the issuing agency, with a solicitation number of 1240BH23R0025 and upload date of May 12, 2023. No further details are provided on required products/services, response dates, or other salient information.
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| Amendment3.pdf | ||
| RevisedSheets6-9-23.pdf | ||
| Amendment2.pdf | ||
| Amendment1.pdf | ||
| Attachment1.pdf | ||
| Attachment6.PDF | ||
| Attachment10.pdf | ||
| Attachment8.pdf | ||
| CompleteSolicitation.pdf | ||
| Attachment5.pdf | ||
| Attachment3.pdf | ||
| Attachment4.pdf | ||
| Attachment9.pdf | ||
| Attachment2.pdf |
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Text version
9360 Glacier Hwy., Suite 1 Juneau, Alaska
July 9, 2020 .12
250 Street , Alaska, 99503
Site
. appreciates a A , Alaska. ist isti alysis .
T e- as in
9, 202 neer Mark wski pa platf acent .
li i at tra
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.
- is
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
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11. tence surfaces
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) Alaska Field Rock Classification and Structural Mapping Guide. rial is R5, Very
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surface planes.
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Geologic Hazards:
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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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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
EW
IN
G
PL
AT
FO
RM
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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
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