HomeMy WebLinkAboutTract Map 21760 GeotechReportPreciseGrading(Aug.25,1993)`m zl7;0
GEOTECHNICAL REPORT OF PRECISE GRADING
LOTS 4, 5, 39 THROUGH 44, 52 THROUGH 57
AND 86 THROUGH 90, TRACT 21760 `
TEMECULA, RIVERSIDE COUNTY, CALIFORNIA
FOR
TERRA NOVA CONSTRUCTION COMPANY
P. O. BOX 612
CORONA DEL MAR, CALIFORNIA 92625
AUGUST 25, 1993 W. O. 589 -13 -RC
GeoSoils, Inc.
:..
Geotechnical Engineering • Engineering Geology
24890 Jefferson Avenue • P.O. Box 490 • Murrieta, California 92564 • (714) 677-9651 • FAX (714) 677-9301
August 25, 1993
' W. O. 589 -B -RC
Terra Nova Construction Company
' P.O. Box 612
Corona del Mar, California 92625
' Attention: Mr. Jim Rossman
' Subject: Geotechnical Report of Precise Grading, Lots 4, 5, 39 through 44, 52
through 57, and 86 through 90, Tract 21760, Temecula, Riverside
County, California
' Reference: "Geotechnical Evaluation of Hydroconsolidation and Settlement Potential,
Tract 21760, Temecula, County of Riverside, California," W.O. 589 -A -RC,
' by GeoSoils, Inc., dated June 7, 1993.
In accordance with your request, this final geotechnical report of precise grading is
' provided for Lots 4, 5, 39 through 44, 52 through 57, and 86 through 90, Tract 21760,
in Temecula, Riverside County. The site was previously graded under the observation
and testing services of Soil Tech, Inc. (1990). Precise grading within the subject project,
' under purview of this report, began on August 9, 1993, and was completed on August
20, 1993. Unless superceded by recommendations presented herein, the
recommendations contained in our previous re o (GeoSoils, Inc., 1993) remain
' pertinent and applicable and should be appropriately implemented.
PREPARATION OF EXISTING GROUND
' 1. Major vegetation was stripped and cleared from the entire site prior to grading.
' 2. On lots 4, 5, 42, 43, 44, 52, and 56: The pad areas and at least 5 feet beyond
(see Plate 1) in each direction were overexcavated 36 inches and the bottom was
then scarified 12 inches, brought to at least optimum moisture content, then
' compacted to obtain a minimum relative compaction of 90 percent of the
laboratory standard ASTM D 1557-91.
G
Z
' Los Angeles Co. (818) 785-2158 • Orange Co. (714) 647-0277 • San Diego Co. (619) 438-3155
I
1
1
Terra Nova Construction Company
Tract 21760, Temecula
Lots 4, 5, 39-44, 52-57, and 86-90
W. 0. 589 -B -RC
August 25, 1993
Page 2
3. On lots 41, 53, 54, 55, 86, 87, 88, and 90: The exposed subsoils were scarified
to a depth of about 12 inches, brought to at least optimum moisture content, then
compacted to a minimum relative compaction of 90 percent of the laboratory
standard.
4. On lots 39, 40, 57, and 89: The exposed subsoils were scarified to a depth of
about 18 inches, brought to at least optimum moisture content, then compacted
to a minimum relative compaction of 90 percent of the laboratory standard.
Fill Placement
Fills consisted of native onsite materials that were placed in thin 6- to 8 -inch lifts, brought
to at least optimum moisture content, then compacted to obtain a minimum relative
compaction of 90 percent of the laboratory standard.
Field Testing
' 1. Field density tests were performed using nuclear densometer methods ASTM D
2922-90 and D 3017-81 and sand cone method D 1556-90. The test results are
' presented in the attached Table i. The estimated locations of the field density
tests are shown on the enclosed Field Density Test Location Map, Plates 1
through 4.
2. Field density tests were taken at periodic intervals and random locations to check
the compactive effort provided by the contractor. Based upon the grading
operations observed, the test results presented herein are considered
representative of the compacted fill.
3. Visual classification of the soils in the field was the basis for determining which
maximum dry density value to use for a given density test.
4. Compaction tests have been numbered in a continuous sequence for the tract.
Only tests taken on the subject lots are presented in Table I.
3
GeoSoils, Inc.
' Terra Nova Construction Company W. O. 589 -B -RC
Tract 21760, Temecula August 25, 1993
' Lots 4, 5, 39-44, 52-57, and 86-90 Page 3
' LABORATORY TESTING
Maximum Density Testing
The laboratory maximum dry density and optimum moisture content for the major soil
' types within this construction phase were determined in general accordance with ASTM
test method D 1557-91. The following table presents the results:
t Maximum Dry Optimum Moisture
Soil Type Density r) Content, %
' A - Silty Sand, Dark Brown 128.0 9.5
B - Silty Sand, Orange Brown 133.0 8.5
D - Silty Sand, Brown 124.0 12.5
CONCLUSIONS AND RECOMMENDATIONS
1
U
Recommendations for foundation design parameters, foundation construction, and utility
trench backfill were presented in the referenced report. All findings, conclusions, and
recommendations remain pertinent and applicable except as superceded herein.
REGULATORY COMPLIANCE
Processing of original/existing ground and placement of compacted fills under the
purview of this report have been completed using the observation and selective testing
services provided by representatives of GeoSoils, Inc. Earthwork was performed in
general compliance with the Grading Code of the City of Temecula, California.
Our findings were made in conformance with generally accepted professional
engineering practices, and no further warranty is implied or made. GeoSoils, Inc.
assumes no rsponsibility or liability for work, testing, or recommendations performed or
provided by others. This report is subject to review by the controlling authorities for this
project.
' 4
GeoSoils, Inc.
Terra Nova Construction Company
' Tract 21760, Temecula
Lots 4, 5, 39-44, 52-57, and 86-90
W. O. 589 -13 -RC
August 25, 1993
Page 4
We appreciate this opporunity to be of service. If you have any questions regarding this
report, please do not hesitate to contact our office at (909) 677-9651.
Respectfully submitted,
GeoSoils, Inc.
/l�z2
Alan J. p
Civil Engineer, RCE 18431
Geotechnical Engineer, GE 439
Sherry L. aton
Project Manager
No- 439 9
* Exp.B/30/9 *
Enclosures: Table I - Field Density Tests Summary
Plates 1 - 4 - Field Density Test Location Map
Distribution: (6) Addressee
GeoSoils, Inc.
tj
' WORK ORDER: 589 -B -RC
TABLE I Terra Nova Construction
' FIELD DENSITY TEST SUMMARY
TEST DATE LOCATION ELEV MOIST DRY % TEST SOIL
NO OR CONT DEN REL METH TYPE
DEPTH % PCF COMP
LEGEND: FG - FINAL GRADE
N - NUCLEAR DENSOMETER
S - SAND CONE
I
Tract 21760/Lot
73
8-09-93
4
-3.0
10.1
115.7
90.4
N
A
74
8-09-93
5
-3.0
10.0
116.7
91.2
N
A
75
8-10-93
4
-2.5
9.6
115.5
90.2
N
A
76
8-10-93
5
-1.5
9.9
116.7
91.2
N
A
77
8-10-93
44
-3.0
10.1
117.8
92.0
N
A
78
8-11-93
43
-3.0
13.1
112.3
90.6
N
D
79
8-11-93
42
-3.0
14.1
112.8
91.0
S
D
80
8-11-93
5
-2.0
9.7
118.1
92.3
N
A
81
8-12-93
4
FG
10.1
114.6
92.4
N
D
82
8-12-93
5
FG
12.6
114.2
92.1
N
D
83
8-12-93
44
-1.0
18.4
120.9
97.5
N
D
84
8-12-93
43
-1.5
13.1
116.0
93.5
N
D
85
8-12-93
42
-2.0
12.9
114.0
91.9
N
D
86
8-13-93
39
FG
9.9
117.8
92.0
N
A
87
8-13-93
40
FG
10.7
116.7
91.2
S
A
88
8-13-93
41
FG
11.1
115.3
90.1
N
A
89
8-13-93
42
FG
13.7
112.7
90.9
N
D
90
8-13-93
43
FG
12.8
112.0
90.3
S
D
91
8-13-93
44
£G
13.1
114.6
92.4
N
D
92
8-13-93
39
-2.0
12.8
114.0
91.9
N
D
93
8-16-93
57
-1.5
10.1
116.7
91.2
N
A
94
8-16-93
57
-1.0
10.5
115.9
90.5
N
A
95
8-17-93
56
-3.0
11.1
117.8
92.0
N
A
96
8-17-93
57
-1.5
10.0
117.7
92.0
N
A
97
8-18-93
57
-1.0
9.8
118.1
92.3
N
A
98
8-18-93
56
-1.5
10.6
116.4
90.9
N
A
99
8-19-93
52
FG
9.8
121.8
91.6
N
B
100
8-19-93
53
FG
10.1
123.1
92.6
N
B
101
8-19-93
54
FG
10.0
122.4
92.0
N
B
102
8-19-93
55
FG
9.9
115.9
90.5
N
A
103
8-19-93
56
FG
9.6
116.7
91.2
N
A
104
8-19-93
57
FG
9.8
116.4
90.9
N
A
105
8-20-93
86
FG
9.1
115.8
90.5
N
A
106
8-20-93
87
FG
10.1
116.4
90.9
N
A
107
8-20-93
88
FG
10.6
116.0
90.6
N
A
108
8-20-93
89
FG
9.8
116.9
91.3
N
A
109
8-20-93
90
FG
9.9
115.3
90.1
N
A
LEGEND: FG - FINAL GRADE
N - NUCLEAR DENSOMETER
S - SAND CONE
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