HomeMy WebLinkAbout30578 (959)CIO
TRIAD FOUNDATION ENGINEERING INC
Foundation Engineering • Engineering GeologyITFMaterialTesting • Construction Inspection
17231 EAST RAILROAD STREET, SUITE 100, CITY OF INDUSTRY, CA 91748
TELEPHONE (818) 964-2313
FAX (818) 810.0915 V
November 7, 1989
Job #88-494
Sun -Ray
17244Leaning Pine ` DDiamondBar, CA 91765
Subject: Updated Geologic Map NOV 0
22105 Rim Fire Lane -E
Diamond Bar, California FRG'J1 yG CEN
@AW!q QEV-
nigT
Reference: Preliminary Soils & Geologic Investigation
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
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.
G.
Frank sr lFrankC. Stillman w C
G.E. 805 No. GE805
d Exp. 6-&0-93
FCS ; JLK/thf
Enclosures: Geologic
FCA
Geologic Cross Sections
Distribution: Addressee (4)
2
John L. Kniffen
C.E.G. 1209
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JOHN L. KNIFFEN
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