HomeMy WebLinkAbout3188; COLLEGE BLVD EXTENSTION; BASE THICKNESS CORRECTIONS; 1987-04-281.
SAN DIEGO GEOTECHNICAL CONSULTANTS, INC.
SOIL ENGINEERING & ENGINEERING GEOLOGY
ApriL28, 1987. .
NBS-Lowry . . - Job No. 05-6664-00140-10
400 S. Ramona Avenue, Suite 116 Log No. 7-1513
Corona, California. 91719-1424
Attention: Mr. Bruce Lyon
SUBJECT: BASE THICKNESS CORRECTIONS .
College Boulevard Extension
- Carlsbad, California
Reference: "R-Value Test. Results/Recommended
Structural Sections College Boulevard Extension,
Carlsbad California", dated March 11, 1987
and April 9, 1987 by San Diego Geotechnical /
. Consultants
Gentlemen:
- - '-
Upon review of our referenced letter dated Maróh 11, 1987,we
.
realized that .a mistake in the calculation of the base
thicknesses occurred. The corrected base thicknesses were
presented in the referenced letter dated April 9, 1987 along with
'- some additional structural section information. We sincerely
regret this-mistake and any inconveniences it may have caused.
This opportunity to be of service is sincerely appreciated. If
you should have any further questions, p1-ease do not hesitate to
contact the undersigned at your convenience.
.
Very truly yours, . • -
SAN DIEGO GEOTECHNICAL CONSULTANTS, INC.
F.
A ~F.Z~fast-,PEC 40333
CIVIL Registration
C 0o333
.
Expires:
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3-31-91
e
PAT/AF/pb - .-
-- - •. . - - -
Distribution: 2 letters - dtd 03-11-87 and 04-09-87 -:
6455 NANCY RIDGE DRIVE • SUITE 200 • SAN DIEGO CALIFORNIA 92121 • (619) 587.-025b
-- •'". - - r-
•
INCORPORATED C
SAN DIEGO GEOTECHNICAL CONSULTANTS, INC.
SOIL ENGINEERING & ENGINEERING GEOLOGY
April 9; 1987 •
NBS-Lowry Job No. 05-6664-001-00-10
400 S. RamonaAvenue,Süite 116 Log No. 7-1423
Carona, California 91719-1424
-
Attention: Mr. Bruce Lyon -
SUBJECT: R-VALUE TEST RESULTS/RECOMMENDED STRUCTURAL SECTIONS
College Boulevard Extension
' Carlsbad, California -
Gentlemen: -
Provided herein are the results of R-Value tests performed on
representative samples from the subject site and the
corresponding structural sections we recommend. The samples were
obtained under the direction of a representative from your
firm. The traffic index of 8.5, used in the calculations of the
structural sections, 'was obtained from Rick Engineering.. The
test numbers, test, locations, stations represented by the test,
R-Value, and recommended base sections based on the proposed
asphalt thickness of 5 inches are as follows: '
Test '. Test - . R- Base Thickness (Inches)
No. . Location Stations Represented Value - 5"AC
1 8,+ 25. . 0 + 00 through 15'+ 00 ' 9 . 18.5 .2 21 + 00 15+ 00 thr6ugh.28 + 00 <5 " 19.5 3 39 + 50 28 + 00 through 45 + 00 28 13 4 56+00 45+00 through 58+50 12 .17.5
5 72. + 50 76 + 50 through 68 +-00 , ' 16 16.5 6' -79 +00 - 76 +,00 through 81 +-00 16 . -
• 7. 83 + 00 81 + 00 through 84 +00 14 17 8 62 + 25 58 + 50 through 68 + 00 12 17.5 - 9 . 96 + 50 94 + 50 through-97,+ 50. 8 ' 19.0
10 98 +00 97 +50 through 98 +80 5 • 19.5
The R-value test results listed, above are representative' of the
subgrade soil conditions at existing elevations per plan Any
6455 NANCY RIDGE DRIVE • SUITE 200 • SAN DIEGO, CALIFORNIA 92121 • (619)587 0250