HomeMy WebLinkAbout; Thum Lands Lot 237; Soils Report; 1968-04-02SOIL TESTING LABORATORY
OF NORTH COUNTY INC.
April 2, 1968
I 423 HALE AVE. . ESCONDIDO, CAUF. 92025
ESCONDIDO-746-2333
OCEANSIDE-722-2125
Mr. O.G. Parker
1092 Chinquapin Avenue
Carlsbad, California
Subject: Final Clearance Report on
Compactt!d Fill Ground
Dear Mr. Parker:
Re: Job No. 68-33
Portion of Lot 237,
Thum Lands, Map li81,
Carlsbad, California
San Diego County
.
At your request, we have inspected and tested the fill ground placed on
the reference property.
It is our understanding proposed two-story apartments are to be con-
structed on the site.
A portion of the area filled under our control contained fill ground. The
fill was placed in June 1964, and was tested by H. V. Lawmaster and Co.,
Inc. H. V. Lawmaster’s report stated, “The fill was compacted to at least 90%
of maximum dry density. A safe bearing value of 1000 psf. may be used
for the compacted fill belovi continuous footings embedded at least twelve
(12) inches below finished grade for one story structures and eighteen (18)
inches below finished grade for two story structures”.
All grass and other rubbish was removed from the-area to be filled. The
native ground was then scarified, watered and rolled with a sheepsfoot
compactor, before fill was placed. The fill was placed in lifts approximateIy
six inches in depth, and compacted.
Field density tests were taken at finish grade elevation. All filled ground areas
contained less than two feet of fill. The results of our observations, field
density tests, and laboratory tests indicate the compacted fill ground has been
placed at not less than 90% of maximum dry,density.
No expansive material was encountered during the grading operation.
The approximate areas of filled ground placed under our control and appryxi-
mate locations of field density tests are shown on the enclosed Site Plan.
The grading plan used was prepared by your company.
4-2-68
68-33
Page No. 2
,/ The field density tests were performed in accordance with A. S. T. M. D1556-
58T, sand cone method. The results are presented as follows:
COMPACTION TEST RESULTS
Date Test Re,- Depth of Field Dry Max. Dry Relative
March No. Test Fill Tested Moisture Density Density Compaction
1968 No. % Dry Wt. lblcu. it. lb/cu. ft. %
21 1 F. G. 6. 8 104. 3 127. 5 82. 1
21 2 1 F. G. 10. 1 115. 8 127. 5 90. 7
21 3 F. G. 9.1 112.0 127. 5 87. 9
21 4 3 F. G. 9. 9 118. 5 127. 5 . 92. 9
21 5 F. G. 10. 1 111.0 127. 5 86. 9
23 6 5 F. G. 12. 3 - 119.2 127. 5 93.6
23 7 F. G. 9. 7 116. 8 127. 5 91. 8
F. G. = Finish Grade
The maximum density and optimum moisture content of the fill soils, as
determined by A. S. T. M. D1557-58T test method, which uses 25 blows
of a 10 pound hammer falling from a height of 18 inches on each of 5 layers
in a 4 inch diameter l/30 cubic foot meld, are presented as follows:
LABORATORY TEST
Soil Type
#1
Description Max. Dry Optimum
Density Moisture Content,
lb/cu. ft. 70 Dry Wt.
Light Brown, fine to medium . 127. 5 10. 5
Sand
Respectfully submitted,
E. Brian Smith RCE 13, 817
EBS:ct
Enclosure: Site Plan
Distribution: Addressee (3)
City of Carlsbad (2)
SOIL TESTING LABORATORY OF NORTH COUNTY INC.
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