HomeMy WebLinkAboutTract Map 21760 GeotechReportPreciseGrading(Mar.2,1994)-A -k Z-11400
7994
a
Geotechnical Report of Precise Grading
58, 59, and 82 through 85
_%�M 0, Temecula
Riverside County, California
for
Terra Nova Construction Company
P.O. Box 612
Corona del Mar, California 92625
March 2, 1994 W. O. 589 -B -RC
GeoSoils, Inc.
•
Geotechnical • Geologic • Environmental
24890 Jefferson Avenue • Murrieta, California 92564 • (909) 677-9651 • FAX(909)677-9301
Mailing Address: P.O. BOX 490 • Murrieta, California 92564
March 2, 1994 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 58, 59, and 82 through 85,
Tract 21760, Temecula, Riverside County, California
References: 1) "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.
2) "Summary of Existing Graded Lots Potentially Requiring Remedial
' Earthwork, Tract 21760, Temecula, County of Riverside, California," W.O.
589 -A -RC, by GeoSoils, Inc., dated March 5, 1993.
' In accordance with your request, this final geotechnical report of precise grading is
provided for Lots 58, 59, and 82 through 85, 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 February 16, 1994, and was completed on February 24, 1994. Unless
superseded by recommendations presented herein, the recommendations contained in
' our previous referenced reports (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 58, 82, 83, 84, and 85: 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.
V
Terra Nova Construction Company
Tract 21760, Temecula
Lots 58, 59, and 82-85
W.O. 589 -B -RC
March 2, 1994
Page 2
3. On lot 59: The pad area and at least 5 feet beyond in each direction was 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
1. Field density tests were performed using nuclear densometer-methods ASTM D
2922-90 and D 3017-81. 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, Plate 1.
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.
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:
3
GeoSoils, Inc.
Terra Nova Construction Company
Tract 21760, Temecula
Lots 58, 59, and 82-85
Soil Tvpe
A - Silty Sand, Dark Brown
F - Sandy Silt, Olive Brown
Expansion Index
Maximum Dry
Density pcf
128.0
121.5
W.O. 589 -13 -RC
March 2, 1994
Page 3
Optimum Moisture
Content. %
9.5
12.0
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
58, 59 21 Low
82-85 27
Low
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.
0
GeoSoils, Inc.
i
Terra Nova Construction Company
Tract 21760, Temecula
Lots 58, 59, and 82-85
W.O. 589 -13 -RC
March 2, 1994
Page 4
We appreciate this opportunity to be of service. If you have any questions, please call
us at (909) 677-9651.
pFESS/
Respectfully submitted Ohq�
GeoSoils, Inc.
No. GE 211
Geotechnical gEn�gii-n�ee %!yl ' ==�� Sa��
� of CAUF��
Sherry LjEaton
Project Manager
Enclosures: Table I - Field Density Test Summary
Plate 1 - Field Density Test Location Map
Distribution: (6) Addressee
GeoSoils, Inc.
WORK ORDER:
589 -B
--RC
TABLE
I
Terra Nova
FIELD
DENSITY TEST SUIRIARY
'
TEST
DATE
LOCATION
ELEV
MOIST
DRY
TEST
SOIL
NO
OR
CONT
DEN
REL
HETH
TYPE
'
DEPTH
%
PCF
COMP
159
2-16-94
Lot 85
1065.5
14.7
109.9
90.5
N
F
160
2-16-94
Lot 84
1067.5
14.4
109.4
90.0
N
F
161 *
2-16-94
Lot 83
1070.0
16.8
99.6
82.0
N
F
161 A
2-24-94
Lot 83
1070.0
14.3
111.5
91.8
N
H
162
2-16-94
Lot 58
1068.6
12.3
111.4
91.7
N
F
'
163
164
2-23-94
2-23-94
Lot 84 FG
Lot 83 FG
1069.5
1072.0
10.3
119.0
93.0
N
A
12.4
117.8
92.0
N
A
165
2-23-94
Lot 85 FG
1067.5
11.0
112.9
92.9
N
F
166
2-23-94
Lot 82
1073.0
12.8
110.0
90.5
N
F
'
167
2-23-94
Lot 82 FG
1075.0
9.7
118.0
92.2
N
A
168
2-23-94
Lot 58 FG
1070.6
9.5
115.7
90.4
N
A
169
2-23-94
Lot 59 FG
1074.2
9.6
117.3
91.6
N
A
'
Legend:
-
Failing Test
A -
Retest
'
FG -
N -
Finish Grade
Nuclear Densometer