HomeMy WebLinkAbout; La Costa Plaza Shopping Center; Compacted Filled Ground; 1972-05-18gnr$r;.$:y:i~s :
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BENTON ENGINEERING. INC.
APPLIED SOIL MECHANICS ~~~ FOUNOATIONS
6741 EL C*.ION BOUL.E”*RD
SAN DIEGO. C*LIFORNI* 92115
PH,LIP HENKING BENTON PRESIDFNT ClYiL ENGINEER h4ay 18, 1972
La Costa Land Company
Costa Del Mar Road
Ran&o La Costa, California 92008
Attention: Mr. h-v Roston
s*ri DlLCO, 583~5654 L.A MESA 469~5654
Subject: Project No. 69-12-23D
Second Interim Report on
Compacted Filled Ground Placed
on a Portion of the Site
For the La Costa Plmo Shopping Center
Northeast of El Camino Real
and La Costa Avenue
San Diega County, California
Gentlemen:
This is to report the resulk of tesk and observations made in order to inspect the compaction
of filled ground placed on a portion of the area of the proposed Lo Costa Plma Shopping
Center, located northeasterly of the intersection of El Camino Real and La Cc&a Avenue,
San Diego County, California. The fills were placed and inspected during the period
between March 21 and April 27, 1972. Compacted filled ground had been previously placed
on this site during the period between December 24, 1969 and January 13, 1970 and the
resulk of task taken during this period were included in our interim report on this prolect
dated October 14, 1971.
The approximate arece and depths of filled ground placed under our inspection in accordance
with the approved specifications are shown on the attached Drawing No. 1, entitled
“Location of Compacted Filled Ground.” The gradlng plan used for the placement of filled
ground was prepared by Rick Engineering Company, and dated August 20, 1971.
The approximate locations at which the recent tesk were taken are shown on Drawing No. 1,
revised ce of 5-17-72, and the final test resulk are presented on page No. 3, under the
“Table of Test Resulk.” The laboratory determinations of the maximum dry densities and
optimum moisture contenk of the major fill materials are presented on page No. 3, under the
“Laboratory Test Resulk.” The ksk were taken durlng the weekly periods indicated below:
Test Number Week Ending
1 to 13, inclusive March 25, 1972
14 to 22, inclusive April 29, 1972
SlOlO
.16.25
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Project No. 69-12-23D
Lo Costa Land Company
-2- May 18, 1972
It is understood that the orea for the proposed Market Building, at the north end of the site,
has now been brought to finished grade. Only nonexpansive sails were placed in the upper
three feet below finished grade within this building area ond to a horizontal distance of 20
feet oukide the building.
The final results of tests and observations indicate that the compacted filled ground has been
placed at 90 percent of the maximum dty density or greater. It has been determined that the
fill materials, placed in the area for the proposed Market Building and compacted to 90 per-
cent of the maximum dry density, have a safe bearing value of 1000 pounds per square foot
for footings founded at a depth of one foot below the final compacted ground surface.
Respectfully submitted,
BENTON ENGINEERING, INC.
BY #P
R. C. Remer
Reviewed by
Philip H. Benton, Civil Engineer
Distr: (4) Lo Costa Land Compny
(I ) La Costa Land Compony, Attn: Mr. Irv Roston
(I) George R. Sounders 8, Associates
(2) Rick Engineering Company
RC R/PHB/ew
BENTON ENGINEERING. INC.
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Project No. 69-12-23D
La Costa Land Company
-3-
Test
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Elevation
of Fill
at Test
in Feet
* Finished Gmde
11.0
12.0
11.0
12.0
12.0
11 .o
13.0
13.0
12.0
13.0
12.0
13.0
13.0
13.0
8.0
13.0
10.0
12.0
14.5 *
14.5 *
14.5 l
14.5 *
TABLE OF TEST RESULTS
Field DV
MOiStU~ DWSity
% dry wt Ib/cu ft
Maximum
DV
Density
Ib/cu ft
6.9 111.7 121.2
10.9 111.1 121.2
6.5 110.7 121.2
10.0 110.4 121.2
17.9 114.1 119.3
13.2 117.4 119.3
14.0 112.1 121.2
18.6 110.9 119.3
5.7 122.5 125.3
5.3 121.9 125.3
5.2 119.4 125.3
5.6 115.3 125.3
6.1 108.8 125.3
8.1 112.3 125.3
9.7 114.0 125.3
5.2 116.1 125.3
6.8 114.2 125.3
8.2 115.3 125.3
8.5 114.1 125.3
5.3 119.8 125.3
5.9 117.1 125.3
5.5 115.0 125.3
LABORATORY TEST RESULTS
May 18, 1972
Percent
Compaction Remarks
92.3
91.7
91.4
91.2
95.6
98.5
92.5
93.0
97.8
97.4
95.4
92.1
86.9
89.7
91 .o
92.7
To be reworked
Reworked
91.2
92.1
91.1
95.6
93.6
91.7
Check on #14
The maximum dry densities and optimum moisture contenk of the major fill materials as deter
mined by the A.S.T.M. D 1557d6T method, that uses 25 blows of a 10 pound mmmer falling
from a height of 18 inches on each of 5 layers In a 4 inch diameter l/30 cubic faot compaction
cylinder, am presented as follows:
Soil Type
Light brown slightly silty fine sand
Gmy brown ffne sandy clay
Brown slightly silty fine ta medium sand
Maximum Optimum Mois-
Dry Density turn Content
Ib/cu ft %drywt
121.2 9.3
119.3 12.5
125.3 9.4
BENTON ENGINEERING. INC.