HomeMy WebLinkAboutTract Map 21760 GeotechReport(Oct.12,1993)Geotechnical Report
of Precise Grading, Lots 17 through 23
60 through 62, and 78 through 81,
Tract 21760, Temecula
Riverside County, California
for
Terra Nova Construction Company
P.O. Box 612
Corona del Mar, California 92625
October 12, 1993 W. O. 589 -B -RC
GeoSoils, Inc.
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- v Geotechnical Engineering • Engineering Geology
24890 Jefferson Avenue • P.O. Box 490 • Murrieta, California 92564 • (714) 677-9651 • FAX(714)677-9301
October 12, 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 17 through 23, 60 through
62, and 78 through 81, 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 17 through 23, 60 through 62, and 78 through 81 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Unless superseded by recommendations presented herein, the recommendations
' contained in our previous report (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 62, 78, 79, 80, and 81: The pad areas and at least 5 feet beyond 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.
3. On lots 60 and 61: The pad areas and at least 5 feet beyond in each direction
' were overexcavated 30 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.
' Los Angeles Co. (818) 785-2158 • Orange Co. (714) 647-0277 • San Diego Co. (619) 438-3155
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Terra Nova Construction Company
Tract 21760, Temecula
Lots 17-23, 60-62, and 78-81
W.O. 589 -B -RC
October 12, 1993
Page 2
3. On lots 17, 18, 19, 20, 21, 22, and 23: 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.
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
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 enclosed Table I. The estimated locations of the field density
tests are shown on the enclosed Field Density Test Location Map, Plates 1
through 3.
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 herein on Table I.
GeoSoills, Inc.
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Terra Nova Construction Company W.O. 589 -13 -RC
Tract 21760, Temecula October 12, 1993
Lots 17-23, 60-62, and 78-81 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:
Maximum Dry Optimum Moisture
Soil Type Density pcf Content. %
A - Silty Sand, Dark Brown 128.0 9.5
D - Silty Sand, Brown 124.0 12.5
E - Sandy Silt, Brownish Yellow 119.5 14.5
Expansion Index
' Expansive soil conditions have been evaluated for each lot. Representative samples of
the soils near pad grade were recovered for expansion index testing.
' Expansion Index tests were performed for the typical foundation soil types exposed at
pad grade in general accordance with UBC Standard #29-2 as outlined in Section
2904(b) of the Uniform Building Code. These test results are shown below:
' Lots Expansion Index UBC Classification
' 17-23 54 Medium
60-62, 78-81 33 Low
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Terra Nova Construction Company W.O. 589 -13 -RC
Tract 21760, Temecula October 12, 1993
' Lots 17-23, 60-62, and 78-81 Page 4
' CONCLUSIONS AND RECOMMENDATIONS
Recommendations for foundation design parameters, foundation construction, and utility
' trench backfill were presented in our referenced report, dated June 7, 1993. All findings,
conclusions, and recommendations remain pertinent and applicable except as
superseded 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 responsibility 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.
' We appreciate this opportunity 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, Vq,OFESS/CN
0G. Si- qlF
GeoSoils, Inc. ='' 9y2 w
No.49754 M
* EXR 9/30/96
' yne C. Stoker s�q CIVIL
Civil Engineer, RCE 49754 �OFCAL�FOP
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Sherry L. ton
' Project Manager
Enclosures: Table I - Field Density Test Summary
' Plates 1 through 3 - Field Density Test Location Map
' Distribution: (6) Addressee
GeoSoils, Inc.
GeoSoils, Inc.
Work
Order 589-B-RC
Client:
Terra Nova Construction
TABLE I
FIELD
DENSITY TEST SUMMARY
Elev
Moist
%
Test
or
Cont
Dry Den
Rel
Test
Soil
'
No.
Date
Location
Depth
%
pcf
Comp
Meth
Type
111
9-28-93
Lot #78
-3'
11.6
117.7
92.0
N
A
112
9-28.93
Lot #79
-3'
12.6
119.0
93.0
N
A
113
9-30-93
Lot #80
-3'
14.1
116.6
91.1
SC
A
'
114
9-30-93
Lot #81
-3'
16.0
117.7
92.0
N
A
115
9.30-93
Lot #78
-1.5'
15.6
109.4
91.5
N
E
'
116
9-30-93
Lot #79
-1.5'
16.1
110.2
92.2
N
E
117
9-30-93
Lot #60
-2.5'
17.2
111.1
93.0
N
E
91.5
SC
E
118
10-1-93
Lot #61
-2.5'
15.3
109.4
'
119
10-1-93
Lot #62
-3.0
16.2
110.1
92.1
N
E
120
10-1-93
Lot #81
-1.5'
17.9
110.7
92.6
N
E
'
121
10-1-93
Lot #60
-1.0'
16.6
108.6
90.9
N
E
122
10-1.93
Lot #62
-1.0'
17.7
109.7
91.8
SC
E
'
Lot #78
F.G.
12.5
111.8
90.2
N
D
123
10-6-93
'
124
10-6-93
Lot #79
F.G.
12.6
112.2
90.5
N
D
125
10-6-93
Lot #80
F.G.
12.5
113.4
91.5
N
D
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126
10.6.93
Lot #81
F.G.
14.5
112.7
90.9
N
D
127
10-6-93
Lot #17
F.G.
14.6
107.6
90.0
N
E
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128
10.6-93
Lot #18
F.G.
14.5
108.0
90.4
N
E
129
10.6-93
Lot #19
F.G.
14.6
108.4
90.7
N
E
130
10-6-93
Lot #20
F.G.
14.5
109.3
91.5
N
E
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131
10-6-93
Lot #21
F.G.
14.5
109.0
91.2
N
E
132
10-6-93
Lot #22
F.G.
14.6
109.1
91.3
N
E
'
133
10-6-93
Lot #23
F.G.
14.5
108.9
91.1
N
E
134
10-6-93
Lot #62
F.G.
12.6
112.4
90.6
N
D
Lot #61
F.G.
12.8
112.9
91.0
N
D
135
10-6-93
1/ O
136
10-6-93
Lot #60
F.G.
12.7
112.7
90.9
N
D
GeoSoils, Inc.