HomeMy WebLinkAbout; La Costa; Soils Report Interim; 1972-08-18-
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BENTON ENGINEERING, INC.
APPLIED SOIL MECH*NIC* ,~- FOUNDATIONS
6741 EL CAJON BOVLEYARD BAN DIEGO. CALIFORNIA 92115
PHIL,P HENKING BENTON .RLBIDLNT ClVlL ENGIHEFI) August 18, 1972 SAN DIEGO: 583.5654 LA MESA: 469.565.
La Costa Land Company
Costa Del Mar Road
Ran&o La Costa, California 92008
Subject: Prolect No. 69-4-14D
L-6352
interim Report on
Compacted Filled Ground
Area North of Alga Road
And Almaden Lane
La Costa
San Diego 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 an off-site fill area located north of the intersection of Alga Road
and Almaden Lane at La Costa, San Dieso County, Colifomio. Filled ground hod pmviously
been placed on this area and the results of the tests token in the compacted fill ware included
in our reporkon Project No. 66-3-31D dated i)ecember 16, 1966 and ?rooject No. 69-4-14D,
the first report under this project doted May 27, 1969 and the most recent dated October 27,
1970. The tesk included in this report, Nos. 84 to 176, inclusive, am numbered consecutively
after those reported on October 27, 1970, and were ta&en during the period between October
29, 1970and June29, 1972.
The approximate arece and depths of filled ground placed under our inspection in accordance with
the approved specifications ore shown on the attzched Drawing No. 1 A, entitled “Ltication of
Compacted Filled Ground.” .The grading plan used for the placement of filled ground was
prepared by Rick Engineering Company.
The approximate locations at which the tests were taken ore shown on Drawing No. 1 A, and the
final test rest11 k am presented on pages c ’ to 5, inclwive, under the ‘Table of Test Results.” The
laboratory determinations of the maximum dry densities oqd optir lum moisture contents of the major
fill moteriols are presented on page 6, under the Laboratory Test &sulk. Some of the maximum
dry densities shown in the “Table of Test Results’ were combinations of these. The tests mre taken
during the weekly periods indicated below:
Test Number Week Ending
84 to 95, inclusive October 30, 1970
96 to 113, inclusive November 6, 1970
114 to 119, inclusive July 2, 1971
120 to 125, inclusive July 9, 1971
SlOlO .17.71
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rroiect No. 69-4-14D
La Costa Land Company
-2- August 18, 1972
Test Number Week Ending
126 to 129, inclusive July 16, 1971
130 to 133, inclusive April 21, 1972
134 to 139, inclusive April 28, 1972
140 to 143, inclusive May 5, 1972
144 and 145 1 May 12, 1972
146 to 162, inclusive June 23, 1972
163 to 176, inclusive June 30, 1972
The final results of tests and observations indicate that the compacted filled ground hos been
placed at 90 percent of the maximum dry density or emoter.
Respectfully submitted,
BENTON ENGINEERING, INC.
D. F. Ledte
Distr: (4) Lo Costa Land Company
(1) Attention: Mr. Burton L. Kramer
(2) San Diego County Building Inspection
Visto Office
(1) Rick Engineering Company, Carlsbad
DFL/PHB/ew
BENTON ENGINEERING. INC.
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Project No.69-4-14D
La Costa LandCompany
-3- August 18, 1972
TABLE OF TEST RESULTS
Test
No.
2
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
Depth
of Fill
at Test
in Feet
Field DV
Moisture Density
% dry wt Ib/cu ft
Maximum
DV
Density
Ib/cu ft
Percent
Compaction Remarks
27 10.1 118.6 125.0 94.8
28 14.1 117.3 125.0 93.9
21 13.4 115.4 125.0 92.3
23 14.1 108.3 120.0 90.4
29 14.4 110.5 121.0 91.3
30 14.3 108.9 120.6 90.3
22 15.7 107.8 119.0 90.5
25 15.1 103.6 114.0 90.8
29 13.1 105.9 116.5 90.9
32 14.5 115.4 119.3 96.7
24 13.8 110.0 119.8 92.0
27 21.3 104.4 112.8 92.6
31 13.2 110.8 120.0 92.3
34 14.9 107.2 116.4 92.1
31 15.8 108.6 120.6 90.1
26 13.8 108.3 118.0 91.7
33 16.1 103.5 114.8 90.3
36 17.2 111.6 120.6 92.6
36 14.9 105.0 114.8 91.6
30 15.5 109.2 120.6 90.6
40 11.9 103.5 114.8 90.3
35 10.9 108.2 119.0 91.0
28 13.2 105.9 114.8 92.3
26 15.3 109.2 119.0 91.9
37 15.1 107.0 117.0 91.4
30 15.0 108.8 119.0 91.3
37 16.0 110.3 120.6 91.6
32 13.6 105.3 115.9 91.1
39 15.7 109.0 120.6 90.5
28 16.0 105.0 115.9 90.6
13 11.7 98.8 121.0 81.6 Reworked
32 17.3 105.9 118.7 89.3 Reworked
13 14.3 116.2 121.0 96.2 Check on#114
41 11.7 116.1 121.6 95.6
34 7.6 105.9 119.0 88.9 Reworked
32 12.1 103.3 121.0 85.3 Check on #115, Reworked
32 13.7 106.8 117.0 91.1 Check on #115 & 119
15 ,15.3 108.1 119.0 90.9
34 15.0 107.0 119.0 90.0 Check on#118
36 12.3 104.2 119.0 87.7 Reworked
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Prolect No. 69-4-14D
LaCosta LandCompany
-4
Test
No.
Depth
of Fill
at Test
in Feet
Field
Moisture
Y/J dry wt
124 36 12.2
125 34 14.0
126 18 13.4
127 36 14.1
128 36 14.0
129 38 12.0
130 28 18.2
131 28 17.4
132 28 16.2
133 28 12.8
134 30 14.3
135 30 13.1
136 32 14.2
137 32 14.0
138 34 12.7
139 34 14.1
140 36 14.3
141 36 14.3
142 36 14.4
143 36 16.:
144 38 11.9
145 38 13.7
146 38 12.4
147 27 14.3
148 40 15.0
149 38 13.1
150 38 12.1
151 18 17.4
152 41 14.0
153 41 13.8
154 40 10.3
155 40 13.9
156 42 14.0
157 40 14.7
158 41 10.8
159 41 13.2
160 40 14.9
161 43 14.7
162 38 15.0
163 40 13.3
TABLE OF TEST RESULTS(CONT.)
DV Density
lb/cu ft
Maximum
DV Density
Ib/cu ft
BENTON ENGINEERING. INC.
107.4
109.2
109.1
i17.2
115.2
115.2
104.2
108.3
105.7
109.1
109.8
110.9
110.1
110.2
102.7
111.5
105.3
103.7
106.8
108.7
111.3
108.8
112.2
108.2
116.7
110.3
102.1
111.4
105.5
113.2
112.0
112.0
113.9
112.8
113.4
110.0
111.2
116.1
114.1
110.8
119.0
119.0
119.0
127.2
122.3
122.3
110.7
119.0
116.4
116.4
118.3
122.3
122.3
122.3
110.7
122.3
116.5
114.3
116.5
116.5
122.3
119.1
121.6
119.0
125.0
121.6
110.7
121.6
116.1
121.6
121.6
121.6
121.6
121.6
121.6
121.6
121.6
121.6
121.6
121.6
August 18, 1972
Percent
Compaction Remarks
90.3
91.9
91.7
92.1
94.3
94.3
94.4
91.1
90.6
93.7
92.7
90.5
90.0
90.1
92.8
91.1
90.5
90.6
91.6
93.3
91.1
91.2
92.4
91.0
93.3
90.9
92.3
91.7
91.0
93.2
92.2
92.2
93.6
92.7
93.4
90.6
91.6
95.6
94.0
91.1
Check on#123
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Pro/act No.69-4-14D -5-
LaCosta LandCompany -
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Depth
of Fill
at Test
in Feet
Field
h4OiStWS
% drywt
DV
Demity
Ib/cu ft
Maximum
DV
Demlty
Ib/cu ft
Percent
Compaction
29 12.0 115.4 121.6 95.0
20 9.3 108.4 119.2 91.0
43 14.5 116.5 121.6 95.9
43 10.0 105.1 116.9 90.1
42 14.8 110.5 121.6 91.0
43 14.3 111.0 122.0 91.0
43 13.7 107.0 116.9 91.6
42 12.0 106.8 116.9 91.4
45 11.4 111.9 119.2 93.6
44 13.8 112.1 119.2 94.0
42 13.0 96.0 111.9 85.9
42 14.3 107.4 116.9 92.0
42 13.7 109.8 116.9 93.9
TABLE GFTESTRESLJLTS(CONT.)
August 18, 1972
Remarks
Reworked
Checkon#174
BENTON ENOINEERING. INC.
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Project No. 69-4-14D -6- August 18, 1972
La Costa Land Company -
LABORATORY TEST RESULTS
The maxlmum dry densities and optimum moisture contenk of the major fill materials as deter-
mined by the A.S.T.M. D 1557-66T method, that 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 compaction
cylinder, are presented as follows:
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Soil Type
Brownish-gray fine sondy clay ond silty fins sand
Dark brown silty cloy
Yellow-brown silty fine to medium sand
Brown f7ne to medium sandy clay
Brown silty clay
8r0wn black silty clay
Light brown silty clay with rusty streaks
Light brown streaks of rusty silty clay
Red-brown silty clay
Brown fine sandy cloy and scattered gravel (topsoil)
Olive-green silty clay
Light gray clay
Light olive-gray, very fine sandy clay
Yellow-brown slightly clayey fine to coalse sand
Groy-brown clayey fine sand
Groy-brown clayey very fine to fine sand
Dark gray clayey topsoil
Light olive silty clay with silktone
Gray-brown slightly clayey fine to medium sand
Yellow olive-brown fine to medium sondy clay
Maximum
Dry Demity
Ib/cu ft
Optimum Mois-
ture Content
% dry wt
121 .o 12.1
119.0 10.9
120.0 12.0
125.0 10.5
120.8 10.6
114.0 16.1
112.8 16.9
120.6 12.2
111.9 15.3
119.0 11.5
116.9 13.0
110.7 14.1
122.3 10.2
121.6 10.6
121 .o 12.0
119.0 13.5
114.0 16.1
117.0 13.7
127.2 8.8
121.6 11.7
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BENTON ENGINEERING. INC