HomeMy WebLinkAboutCT 75-07; Green Valley Knolls Lots 1-18; Soils Report; 1976-09-22PHILIP “ENIONG BENTON
PILSIDLHT ClVlL ENGlNILR
Lo Costa Land Ccmpany
2100 Cotta Del Mar Road
Carl&ad, California 92008
BENTON ENGINEERING, INC.
APPLIED SOIL MECHANICS - FOtJND*T,ONs
6717 CONVOY COURT SAN DIEGO. CALIFORNIA 92111
September 22, 1976
Subject: Project No. 76-4-20D
Report on
Compacted Filled Ground
Green Valley Knolls
Carlsbad Tract No. 75-7
Model Lots 1 to 18, inclusive
(Formerly Lots 224 to 229, inclusive)
La Costo Area of
Carlsbad, California
Gentlemen:
TELEPHONE 171*, 565.1955
R XEIVED
SEP 2 31976
CITY OF CARLSBAD Building Department
This is to report the results of tests and observations made in order to inspect the canpoction
of filled ground placed on certain areas of Model Lots 1 to 18, inclusive, of Green Volley
Knolls in the La Costa area of Carl&ad, California. These lots were previously designated
OS Lots 224 to 229, inclusive, on the original grading plan prepared by Rick Engineering
Company and dated April 6, 1976. Th e i s were placed during the period between April f II
21 and September 21, 1976.
The approximate areas and depths of filled ground placed under our irxpectiw, in accordance
with the approved specifications are shown on the attached Drawing No. 1, entitled “Location
of Compacted Filled Ground.” The grading plan used for the placement of filled ground,
revised August 23, 1976, was prepared by Rick Engineering Company.
Test Nos. 1 to 43, inclusive, taken during the initial grading of Green Valley Knoll<, are
located in the “Table of Test Results” according to the original Lot Nos. 224 to 229, inclusive.
Test Nos. 44 to 209, inclusive, ore located according to the recently revised Lot Nos. 1 to 18,
inclusive, shown on the attached Drawing No. 1.
The approximate locations at which the tests were taken and the final test result5 are presented
on pages 3 to 10, inclusive, under the “Table of Test Results.” The laboratory determinotionz
of the maximum dry densities and optimum moisture content< of the moior fill materials are
presented on page 11, under the “Laboratory Test Resul tq. ” Some of the maximum dry densities
shown in the “Table of Test Results” were ccmbinatiwrs of these. The tests were taken during
the weekly periods indicated on the following page.
Project No. 76-4-20D
Green Valley Knolls
-2- September 22, 1976
Test Number Week Ending
1 to 28, inclusive
29 to 38, inclusive
39 and 40
41, 42, and 43
44 to 61, inclusive
62 to 65, inclusive
66 to 98, inclusive
99 to 114, inclusive
115 to 120, inclusive
121 to 127, inclusive
128 to 163, inclusive
164 to 182, inclusive
183 to 196, inclusive
197 to 209, inclusive
April 24, 1976
May 1, 1976
May 15, 1976
June 5, 1976
July 3, 1976
July 10, 1976
July 17, 1976
July 24, 1976
July 31, 1976
August 28, 1976
September 4, 1976
September 11, 1976
September 18, 1976
September 21, 1976 (Date of last test)
Filled ground was placed over some areas of existing ccmpocted filled ground. The results of
field density tests token in these existing ccmpacted filled ground areas were presented in our
previous report dated January 8, 875 and entitled “Project No. 73-l l-12D, Final Report on
Ccmpocted Filled Ground, Spanish Village Unit No. 1, Carlsbod Tract No. 72-24, Corlsbad,
California.
Existing loose, Foft, or unsuitable natural soils were removed beneath the proposed fill areas OS
recommended and the compacted filled ground was placed on suitable natural ground. Expanive
soils were removed where these existed in the upper three feet below finished grade and the areas
were then brought to grade with properly cunpacted nonexpansive soils. Only nonexpansive soil<
were placed in the upper three feet below finished grade in the compacted filled ground areas and
therefore Tpecial design for expansive soil conditions will not be required for the lots covered in
this repwt.
The final results of tests and observations indicate that the compacted filled ground ha< been
placed at 90 percent of the maximum dry density or greater. It has been determined that the fill
materials, ccmpocted to 90 percent of the maximum dry density, hove a safe bearing value of
1658 pounds per square foot for one foot wide continuous footings founded at least one foot below
the final compacted ground surface and placed five feet or more inside the top of compacted
filled ground slopes. If footings are placed closer to the exposed slopes than 5 feet inside the top
of compacted filled ground slopes, these should be deepened one foot below a 1 l/Z horizontal to
1 vertical line projected outward and downward from a point 5 feet horizontally inside the top of
compacted filled ground slopes.
All buried exterior utility lines should be City of Carl&ad approved plastic lines due to the cor-
rosive characteristics of the soils, unless sufficient field tests are taken to establish that non-
corrosive soils exist in the utility trench areas.
BLNTON ENGINLCRING. INC
Project No. 76-4-200
Green Valley Knolls
-3-
Respectfully submitted,
BENTON ENGINEERING, INC.
Bydd?z&&a
R. C. Remer
Reviewed by
S. H. Shu, Civil Engineer
R.C.E. No. 19913
Distr: (3) Addressee
(2) Addressee
Attention: Mr. Burton C. Kramer
(2) City of Carlsbad
Building Deparhnent
(1) Rick Engineering Company, Carl&ad
September 22, 1976
BENTON ENGINEERING. INC.
Project No. 76-4-200
Green Valley, Knolls
-4- September 22, 1976
TABLE OF TEST RESULTS
Test
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Approx-
imate
Location
Lot No.
227
W. Side
228
Center
229
Center
228
Center
227
W. Side
228
Center
229
Center
229
E. Side
228
E. Side
227
E. Side
227
W. Side
228
Center
229
E. Side
227
Center
228
E. Side
229
W. Side
Depth
of Fill
at Test
in Feet
1.0
3.0
2.0
3.0
1.0
3.0
2.0
1.0
2.0
2.0
5.0
7.0
6.0
9.0
11.0
10.0
Perenne PI. 1 .O
Sta. 2+00
Perenne PI. 1 .O
Sto. 4+00
225 1.0
W. Side
224 2.0
W. Side
Field BY
Moisture Density
% dry wt I b/cu ft
11.4 101.7
11.7 99.3
14.2 97.9
13.8 98.2
12.7 103.4
13.7 103.0
13.2 103.0
11.0 102.9
12.3 102.3
17.6 100.8
16.1 100.3
13.3 103.4
15.8 101.1
18.3 105.3
15.4 102.9
16.0 98.7
12.3 102.8
13.1 100.3
17.5 101.7
9.9 104.0
Maximum
Dry
Density
Ib/cu ft
113.4
113.4
113.4
113.4
113.4
111.3
111.3
113.4
113.4
111.8
110.2
113.4
110.2
116.2
114.0
109.0
114.0
111.0
109.0
114.3
Percent
Compaction
89.7
87.6
86.3
86.6
91.2
92.5
92.5
90.7
90.2
90.2
91 .o
91.2
91.7
90.6
90.3
90.5
90.2
90.4
93.3
91.0
Remarks
Rewaked
Rewaked
Reworked
Rewwked
Check on #l
Check on 12 8 $4
Check on #3
Project No. 76-4-20D
Green Valley Knolls
-5- September 22, 1976
Test
No.
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Approx- Depth
imate of Fill
Location at Test
Lot No. in Feet
Perenne PI. 1.0
End of
Culdesac
226
E. Side
225
Center
224
W. Side
224
W. Side
225
W. Side
225
E. Side
224
E. Side
224
E. Side
225
E. Side
224
E. Side
225
Center
229
W. Side
229
E. Side
225
N. Side
228
E. Side
227
Center
SDG&E
Easement
East226
226
East
225
Rear
3.0 12.4 107.0 117.3 91.2
5.0 10.5 105.8 116.9 90.5
6.0 16.1 99.6 111.8 89.1
6.0 14.5 103.9 111.8 92.9
7.0 11.9 106.2 114.3 92.9
4.0 13.5 106.1 116.9 90.8
4.0 20.6 88.8 111.8 79.4
2.0 10.5 100.6 110.2 91.3
2.0 10.5 104.0 110.2 94.4
4.0 13.1 100.3 110.2 91.0
9.0 15.0 100.8 110.4 91.3
12.0 13.3 111.2 120.4 92.4
12.0 12.9 112.8 120.4 93.7
2.0 13.8 104.6 114.0 91.7
13.0 16.0 103.5 111.5 92.9
11.0 9.6 104.9 114.0 92.0
4.0 14.0 111.8 120.4 92.9
6.0
11.0
11.9
15.0
106.2
105.8
115.4
115.4
92.0
91.7
TABLE OF TESTRESULTS (CONT.)
Field
Moisture
% drywt
13.3
Dry
Maximum
Dry
Density Density Percent
Ib/cu ft lb/c" ft Compaction
106.2 116.9 90.8
Reworked
Check on # 24
Reworked
Check on #28
Remarks
BENTON ENGINEERING. INC.
Project No. 76-4-200
Green Valley Knolls
-6- September22, 1976
Test
No.
Approx-
imate
Location
Lot No.
Depth
of Fill
at Test
in Feet
41 224 10.0
42 226 5.0
43 226 7.0
44 5 15.0
45 7 11.0
46 6 4.0
47 8 4.0
48 7 6.0
49 5 6.0
50 8 8.0
51 6 8.0
52 4 2.0
53 5 10.0
54 6 12.0
55 4 6.0
56 5 14.0
57 4 10.0
58 3 4.0
59 2 4.0
60 4 14.0
61 6 12.0
62 6 12.0
63 6 13.0
64 5 17.0
65 7 13.0
66 6 17.0
67 4 15.0
68 7 15.0
69 8 2.0
70 7 19.0
71 4 19.0
72 5 21.0
73 6 21.0
74 8 6.0
75 4 23.0
76 9 2.0
77 13 2.0
78 12 2.0
79 10 2.0
80 10 4.0
TABLE OFTESTRESULTS(CONT.)
Field
Moisture
% dry wt
Dry
Density
lb/c" ft
14.6
11.1
8.9
10.3
7.7
9.8
14.5
7.1
7.4
7.0
10.3
16.6
12.2
8.2
6.9
9.8
10.8
12.9
9.2
13.1
12.0
7.6
12.6
12.2
14.0
9.7
7.8
12.8
11.6
10.5
8.5
10.1
11.7
8.6
11.1
13.7
12.4
11.3
10.7
12.1
BENTON ENGINEE”INO. WC
103.6
118.0
108.2
108.3
115.6
108.9
103.1
110.2
113.6
108.1
108.9
102.1
107.8
100.0
111.8
106.2
111.1
106.9
109.4
106.2
106.0
114.1
114.4
107.0
104.6
114.9
116.8
104.6
105.3
106.7
109.0
107.4
104.0
107.9
105.9
103.9
105.7
108.2
109.3
105.5
Maximum
Dry
Density Percent
Ib/cu ft Compaction Remarks
113.5 91.3
120.4 98.0
117.3 92.2
117.3 92.4
120.4 96.0
117.3 92.9
114.0 90.5
120.4 91.6
120.4 94.4
117.3 92.2
120.4 90.4
111.8 91.3
115.5 93.3
115.5 86.6 Reworked
120.4 92.9
114.0 93.1
120.4 92.3
115.5 92.6
120.4 90.9
114.0 93.1
115.5 91.8 Check on854
120.6 94.7
120.4 95.1
115.5 92.6
115.5 90.6
120.4 95.5
120.4 97.0
115.5 90.6
115.5 91.1
115.5 92.4
119.2 91.5
116.2 92.3
114.0 91.3
116.2 92.9
114.0 92.9
114.0 91.1
116.2 90.9
119.2 90.8
119.2 91.8
116.2 90.8
Project NO. 76-4-20D
Green Valley Knolls
-7-
Test
No.
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
loo
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
TABLE OF TESTRESULTS(CONT.)
Approx- Depth
imate of Fill Field
Locution of Test Moisture
Lot No. in Feet % dry wt
13 2.0 13.8
9 4.0 12.5
11 4.0 10.7
8 8.0 15.1
12 6.0 11.9
Perenne PI. 3.0 9.8
sta. 2+00
Perenne PI. 3.0 5.8
sta.4+00
Perenne PI. 3.0 10.6
Sto.6+00
Perenne PI. 5.0 10.1
Sta. Et00
Perenne PI. 5.0 8.1
Sta. 7+00
2 14.0 11.7
3 14.0 10.5
5 25.0 9.9
6 25.0 11.5
7 21.0 10.2
6 27.0 * 10.9
7 23.0 * 9.7
13 4.0 11.8
3 12.0 7.9
12 6.0 11.3
12 8.0 11.1
3 12.0 10.9
11 4.0 10.9
12 10.0 11.9
10 6.0 10.8
11 8.0 12.0
16 2.0 10.1
13 7.0 12.5
14 2.0 12.0
15 2.0 13.4
16 4.0 10.7
13 8.0 12.2
18 2.0 11.2
17 2.0 10.5
18 2.0 12.1
21 2.0 12.4
17 4.0 10.5
l Indicates finished grade
Dry Density
Ib/cu ft
Maximum
bY
Density
Ib/cu ft
101.4 111.8
105.2 114.0
105.1 114.0
104.3 114.0
106.9 114.0
114.8 120.4
Percent
Canpaction
90.7
92.2
92.2
91.5
93.7
95.4
117.4 120.4 97.5
111.9 120.6 92.7
110.7 120.6 91.9
112.2 119.2 94.2
105.6 114.3 92.3
107.1 117.3 91.3
108.7 115.5 94.2
107.4 113.5 94.6
107.4 113.5 94.6
110.9 119.2 93.0
110.8 119.2 93.0
111.2 119.2 93.3
98.9 114.0 86.7
108.7 117.3 92.7
114.9 120.4 95.4
110.1 114.0 96.6
111.5 119.2 93.5
111.3 119.2 93.3
107.2 117.3 91.4
105.2 115.4 91.1
105.3 113.5 92.8
106.6 117.3 90.9
102.9 114.0 90.3
109.4 117.3 93.3
109.9 119.2 92.2
107.8 119.2 90.5
105.9 114.0 92.9
110.3 117.3 94.0
106.5 117.3 90.8
106.7 117.3 90.9
113.6 119.2 95.2
September 22, 1976
Remarks
Reworked
Check on #99
Bl%TON ENGINEERING. INC
Project No. 76-4-200
Green Valley Knolls
-8-
Test
No.
118
119
120
121
122
123
124
12.5
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
143A
144
145
146
147
148
149
150
151
152
153
154
155
156
11 9.0
3 13.0
2 11.0
1 14.0
3 14.0
5 1.0
4 18.0
4 18.0
2 14.0
9 11.0
8 9.0
10 17.0
Perenne PI. 2.0
sta. 9+00
6 14.0
7 9.0
8 11.0
9 13.0
8 13.0
6 15.0
14 2.0
14 4.0
15 2.0
14 6.0
1 16.0
2 16.0
15 6.0
16 6.0
14 8.0 *
15 9.0 *
Perenne PI. 6.0
Sta. 8*0
17 2.0
11 12.0
12 9.0
11 14.0 *
13 6.0
17 4.0
18 4.0
16 8.0 *
17 6.0
18 6.0 *
Approx- Depth
imate of Fill
Location of Test
Lot No. in Feet
TABLE OF TESTRESULTS(CONT.)
Field
Moisture
% dry wt
Dry
Density
Ib/cu ft
Maximum
bY
Density
Ib/cu ft
Percent
Ccmpaction
12.4 107.7 117.3 91.8
11.5 103.3 113.5 91.0
12.9 108.7 119.2 91.2
9.8 101.3 111.8 90.6
9.3 102.3 111.8 91.5
9.2 108.4 119.2 90.9
6.9 102.7 119.2 86.2
10.1 110.6 119.2 92.8
11.7 113.0 119.2 94.8
12.0 105.4 114.0 92.4
8.1 105.5 114.0 92.5
10.8 104.2 111.8 93.2
9.4 107.2 116.2 92.3
10.0 108.9 117.3
8.7 107.4 117.3
10.2 107.4 117.3
9.9 104.8 114.0
10.0 110.6 119.2
8.6 107.6 119.2
7.2 105.1 114.0
11.0 106.0 116.2
9.6 106.0 116.2
9.2 105.4 116.2
11.6 104.5 114.0
10.8 107.5 119.2
11.3 104.7 111.8
13.2 101.4 111.8
12.1 103.4 112.3
10.1 104.3 114.0
13.5 105.9 114.0
92.8
91.6
91.6
91.9
92.8
90.3
92.2
91.2
91.2
90.8
91.7
90.3
93.6
90.6
92.1
91.5
92.9
12.8 109.0 119,.2 91.5
10.9 106.7 114.0 93.5
10.8 103.9 114.0 91.2
13.9 102.4 111.8 91.7
11.5 103.8 114.0 91.0
10.8 104.8 114.0 92.0
10.3 105.3 114.0 92.4
10.9 109.9 119.2 92.2
10.9 107.4 117.3 91.6
11.0 99.9 114.0 87.6
September 22, 1976
Reworked
Check on #124
Remarks
Reworked
* Indicates finished grode
BENTON ENGINIERINCi. INC.
Project No. 76-4-20D
Green Valley Knolls
-9- September 22, 1976
Approx-
imate
Test Location
No. Lot No.
157 17
158 13
159 13
160 10
161 10
162 3
163 5
164 1
165 2
166 4
167 3
168 5
169 6
170 7
171 8
172 9
173 9
174 7
175 12
176 13
177 12
178 13
179 opp. Lot 9
180 Opp. Lot 13
181 Opp. Lot18
182 18
183 2
184 3
185 3
186 7
187 6
188 8
189 7
190 9
191 1
192 2
193 3
194 4
195 5
Depth
of Fill
of Test
in Feet
Field
Moisture
% dry wt
Dry
Density
lb/w ft
Maximum
bY
Density
lb/w ft
8.0 * 10.1 111.7 119.2
7.0 10.7 105.4 114.0
8.0 10.3 107.2 117.3
19.0 10.8 106.9 117.3
21.0 * 10.0 107.4 117.3
16.0 8.7 109.2 119.2
17.0 10.3 108.6 119.2
18.0 * 8.9 102.5 111.8
18.0 * 10.7 102.6 111.8
22.0 * 11.7 102.8 111.8
18.0 * 10.1 103.5 111.8
21.0 * 11.4 102.3 111.8
17.0 * 11.4 103.1 111.8
11.0 11.8 102.2 111.8
15.0 * 9.4 104.0 111.8
15.0 9.4 102.5 111.8
17.0 * 11.6 106.1 111.8
13.0 * 10.9 103.4 111.8
11.0 11.6 107.3 111.8
10.0 10.0 104.8 111.8
13.0 * 13.5 101.3 111.8
12.0 * 12.1 101.9 111.8
2.0 11.7 105.0 111.8
4.0 10.5 101.9 Ill.8
2.0 9.0 106.1 111.8
6.0 * 13.5 109.2 114.0
16.0 10.6 105.6 111.8
14.0 13.1 110.0 119.2
16.0 12.1 107.4 115.4
4.0 9.7 109.3 119.2
5.0 10.3 105.2 113.5
6.0 12.5 108.9 116.2
7.0 8.9 106.9 113.5
2.0 10.9 110.0 119.2
18.0 * 10.9 108.2 119.2
18.0 * 9.7 110.1 119.2
18.0 * 10.2 105.0 116.2
22.0 * 10.4 107.6 115.4
21.0 * 12.6 107.1 115.4
TABLE OF TESTRESULTS (CONT.)
Percent
Ccmpaction Remark?
93.7
92.5
91.4
91.1
91.6
91.6
91.1
91.7
91.8
91.9
92.6
91.5
92.3
91.4
93.0
91.7
94.9
92.5
96.0
93.8
90.6
91.2
93.9 Cul de Sac
91.1 Cul de Sac
94.9 Cul de Sac
95.8 Check onX1%
94.5
92.3
93.1
91.7
92.7
93.7
94.2
92.3
90.8
92.4
90.4
93.2
92.8
* Indicates finished grade
eENTON ENGINEERING. INC.
Project No. 76-4-200
Green Valley Knolls
-lO-
TABLE OF TESTRESULTS(CONT.)
Approx- Depth
imate of Fill Field
Test Location of Test Moisture
No. Lot No. in Feet % dry wt
196 6 17.0 l 9.9 111.5 119.2 93.5
197 7 13.0* 13.0 105.1 116.2 90.4
198 8 15.0 * 9.3 107.8 115.4 93.4
199 9 17.0 * 6.6 107.3 115.4 93.0
200 10 21.0 l 10.8 105.0 113.5 92.5
201 11 14.0 * 11.6 111.2 119.2 93.3
202 12 13.0 * 11.5 107.4 115.4 93.1
203 13 12.0 * 11.4 111.5 119.2 93.5
204 Cul-de-sac 9.0 * 13.3 110.9 119.2 93.0 Opp. Lot8
205 14 8.0 + 10.4 111.2 119.2 93.3
206 15 8.0 * 12.8 110.5 119.2 92.7
207 16 8.0 * 10.1 114.3 119.2 95.9
208 17 6.0 * 12.5 107.8 115.4 93.4
209 '18 6.0 * 10.7 104.3 113.5 91.9
DV
Density
Ib/cu ft
Maximum
"r~
Density
lb/c" ft
September 22, 1976
Percent
Ccmpaction Remarks
* Indicates finished grade
BENTON ENGINIERING. INC.
Project No. 76-4-201)
Green Valley Knolls
-ll- September 22, 1976
LABORATORY TEST RESULTS
The maximum dry densities and optimum moicture contents of the maior fill materials as deter-
mined by the A.S.T.M. D 1557-70 method, thot uses 25 blows of a 10 pound rammer falling
from a height of 18 inches on each of 5 layers in a 4 inch diameter l/30 cubic foot ccmpaction
cylinder, are presented as follows:
Soil Description
Brown silty fine to mediun sand
Light orange brown clayey very fine sand
Light gray silty very fine sand
Light gray brown clayey fine sand
Light brown silty very fine to fine sand
Light gray brown silty very fine sand
Light yellow brown silty fine sand
Yellow brown slightly clayey fine to mediun %and
Yellow brown clayey fine sand with siltstone chunks
Yellow brown silty very fine to fine sand
Light gray and yellow brown silty fine to medium <and
Light gray brown silty clay
Brown cilty fine sand with scattered gravel
Light gray fine to medium sand with slight clay binder
Light groy brown silty fine to medium sand
Light gray brown qilty fine sand
Light gray brown silty fine sand
Maximum
Dry Density
Ib/cu ft
119.2
13.4
14.0
14.3
11.8
13.5
16.2
117.3
110.2
112.3
115.5
109.2
120.6
115.4
114.0
114.0
120.4
Optimum Mois-
ture Content
% dry wt
11.8
15.1
12.8
14.0
12.6
13.9
13.2
13.1
15.7
13.8
13.7
17.0
10.5
12.7
13.6
11.5
11.4
eENTON ENGlNEERING. INC.