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Foundation Engineering • Engineering GeologyITF .
Material Testing • Construction Inspection Y NOW n 7 1409
17231 EAST RAILROAD STREET, SUITE 100, CITY OF INDUSTRY, CA 91748 f4-- +--
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Sun -Ray j� 1
1724 Leaning Pine
Diamond Bar, CA 91765
Subject: Updated Geologic Map
22105 Rim Fire Lane
Diamond Bar, California
November 7, 1989
Job ##88-494
NOV 1W
Reference: Preliminary Soils & Geologic Investigation �, v
By Triad Foundation Engineering, Inc.
Dated 9-8-88, 3-21-89, 7-3-89, and 7-14-89
Gentlemen:
Pursuant to your request the Geologic Map from the referenced
report has been updated for the currently proposed project.
The proposed crib wall and residence has been moved considerably
upslope to reduce the required grading. Revised geologic cross
0
sections show the new locations of structures and fills.
The lower portions of the lot contain a dip slope condition for
which a shear key was recommended below the crib wall and large
fill slope.
Test Pits 1 and 3 along with the other bedding plane attitudes
show a significant change in the area of the currently proposed
1
crib wall and house. Bedding planes are nearly level or slightly
daylighted. Based on a 9 degree unsupported bedding condition
shown on Section B-B' the slope surcharge with the proposed fill
will have an adequate safety factor with low assumed shear
strengths on the bedding planes.
It is recommended that the proposed crib wall be extended to a
minimum 5 feet into bedrock at its base. The recommended bearing
capacity for the crib wall is 3000 psf.
All other recommendations in the referenced reports should remain
valid for the current project.
The opportunity to be of service to you on this project is
appreciated, and if you have any questions, please call us at
your convenience.
Respectfully submitted,
TRIAD FOUNDATION ENGINEERING, INC.
QAOFES%
G. ST�E�I
Frank C. Stillman ? 4 `
G.E. 805 ,�„ No. GE8o3 Z
Exp. E33-93
FCS ; JLK/thf \jF�®
Enclosures: Geologic Map
Geologic Cross Sections
Distribution: Addressee (4)
2
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John L. Kniffen
C.E.G.
1209
JOHN L. KNIFFEN ��-A'
No. 1209
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