HomeMy WebLinkAboutCT 72-32; Royal Homes of Carlsbad; Soils Report; 1974-04-17/ ‘, ,I, ,,~,~ ::&,.<$:a,.> ,,:i, 4.~ ,,, . . _
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BENTON ENGINEERING, INC.
APPLIED 60,L MECHANICS -- FOLIND*TIoNS
6717 CONVOY COURT SAN DIEGO. CALIFORNIA 9Lll I
April 17, 1974 ‘/cL‘Pei:/N_ it4 ‘16!i~1455 PHILIP HENKlNG BENTON PREIIOLNT ClYlL ENCINLER
S . L. B B. Service Corporation
592 Elm Street
P. 0. Box “B”
Car&ad, California 92008
Subject: Project No. 73-7-17D
Retul ts of Field Density Tests
Taken in Subgrade and Base Material
&ZlZad Tract No. /L-32- --,\
Carlsbacl, California
ENGINEERING DEPT. LIBRARY
City of Carlsbad
2075 Las Palmas Drive
CarlsbaQ CA 92009-4859
Gentlemen:
This is to report the results of field density tests taken in the subgrade soils and base material
in the street areas of the subject tract.
Test Nos. 1 to 4, inclusive, were taken in subgrade soils on April 11, 1974 and Test Nos. 5
to 9, inclusive, were taken in base material on April 15, 1974. The tests were taken at
locations as directed by a representative of the City of Carlsbad and the final test results ore
presented below:
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Material
Tested
Field
Moisture
% dry wt
Dry
Maximum
Dry
Density
lb/cu ft
Subgrade 5.1
cl
Percent
Compaction a 97.01
Subgrade 6.7 124.0
Subgrade 5.1 124.9
Density
Ib/cu ft
C 129.7
130.2
131.3*
95.2
95.1
Subgrade 6.2 126.3 130.2 97.0
Base 6.1 128.7 133.5 96.3
Base 6.1 129.6 133.5 97.0
Test Approx-
imate
No. Locat ion
1 Syme Dr.
opp. Lot 4
2 Syme Dr.
opp. Lot 19
3 Chinquapin
Ave., 54’ E
of Syme Dr.
4 Royal Dr.
opp. Lot 11
5 Syme Dr.
Opp. Lot 2
6 Syme Dr.
opp. Lot 8
* Indicates combination of two soil types tabulated on page 2
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Project No. 73-7-17D
Royal Homes of Carlsbad Tract No. 72-32
-2-
Test
No.
7
Approx-
imate
Location
Chinquapin
Ave. Opp.
Lot 14
Chinquapin
Ave. Opp.
Lot 1
Royal Dr.
opp. Lot 18
Material
Tested
Base
Field DV
Moisture Density
% dry wt Ib/cu ft
4.7 127.3
Maximum
Dry
Density
Ib/cu ft
133.5
Percent
Compaction
95.4
Bose 6.1 127.2 133.5 95.3
BW 6.2 130.9 133.5 98.0
TABLE OF TEST RESULTS (CONT.)
April 17, 1974
LABORATORY TEST RESULTS
The maximum dry densities and optimum moisture contenk of the subgrade and base materials
as determined by the A.S.T.M. D 1557-66T method, that uses 25 blows of a 10 pound rammer
falling from a height of 18 inches an each of 5 layers in a 4 inch diameter l/30 cubic foot
compaction cylinder, are presented as follows:
Soil Description
Dark brownslightly silty fine to medium sand
Brown slightly silty fine to medium sand
Dark brawn silty fine sand
Light gmy silty fine ta coarse sand (D.G. Base)
Respectfully submitted,
Maximum Optimum Mais-
Dry Density ture Content
Ib/cu ft % dry wt
133.0 7.4
129.7 7.6
130.2 7.9
133.5 8.0
BENTON ENGIN EERIN G, INC,
BY d?fl &B-.
R. C. R’ emer
Reviewed b&!;{ ~~~~~<istr: tgi gAy;arlsbod
Engineering Department
RCR/PHB/pk
BENTON ENGlNEERING. INC.
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