HomeMy WebLinkAboutTract Map 21760 GeotechReportPreciseGrading(Jun.30,1993)1
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' Geotechnical Report of Precise Grading,
Lots 1 through 3 and 109 through 115,
' Tract 21760, Temecula,
Riverside County, California
' for
Terra Nova Construction Company
' P.O. Box 612
Corona del Mar, California 92625
t June 30, 1993 W.O. 589 -B -RC
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GeoSoills. Inc.
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:y3 W Geotechnical Engineering • Engineering Geology
24890 Jefferson Avenue • P.O. Box 490 • Murrieta, California 92362 • (714) 677-9651 • FAX (714) 677-9301
June 30, 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 1 through 3 and 109
through 115, 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 1 through 3 and 109 through 115, 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 June 10, 1993, and was completed on June 21, 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 Unless superseded by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 109, 110, 111, 112, 114, and 115: 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.
' 3. On lots 1, 2, 3, and 113: 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.
' Los Angeles Co. (818) 785-2158 • Omnge Co. (714) 647-0277 • San Diego Co. (619) 438-3155
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Terra Nova Construction Company W.O. 589 -B -RC
Tract 22761, Temecula June 30, 1993
Page 2
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 & 2.
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:
Soil Type
A - Silty Sand, Dark Brown
D - Silty Sand, Brown
Maximum Dry
Density pcf
128.0
124.0
GeoSoils, Inc.
Optimum Moisture
Content. %
9.5
12.5
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Terra Nova Construction Company W.O. 589 -B -RC
Tract 22761, Temecula June 30, 1993
Page 3
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, please call
us at (909) 677-9651.
Respectfully submitted,
GeoSoils, Inc.
*JE
<er
eer,RCE 49754
4v j
Sherry L. Eaton
Project Manager
Enclosures: Plates 1 & 2 - Field Density Test Location Map
Distribution: (6) Addressee
' GeoSoils, Inc.
WORK ORDER: 589 -B -RC
TABLE I
F:LELD DENSITY TEST SUMMARY
TEST DATE LOCATION ELEV MOIST DRY FEST SOIL
NO OR CONT DEN REL METH TYPE
DEPTH PCF COMP
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LOT( STATION
TRACT 21760
58
6-10-93
LOT 111
1071.0
10.6
115.2
90.0
N A
59
6-11-93
LOT 112
1074.0
12.9
113.1
91.2
N D
60
6-15-93
LOT 114
1082.0
10.2
116.2
90.8
N A
61
6-15-93
LOT' 1.13
1080.0
10.1
118.6
92.7
N A
62
6-18-93
LOT 115
1085.0
7.2.5
112.4
90.6
C D
63
6-18-93
LOT 114 FG
1083.9
10.2
119.8
93.6
N A
64
6-18-93
LOT 113 FG
1080.4
9.7
117.7
92.0
N A
65
6-18-93
LOT 112 FG
1076.4
12.6
113.6
91.6
N 0
66
6-18-93
LOT 111 FG
1073.2
10.0
117.4
91.7
N A
67
6-18-93
LOT 110 FG
1070.5
10.0
119.5
93.4
N A
68
6-18-93
LOT 109 FG
1067.5
9.5
116.9
91.3
N A
69
6-21-93
LOT 115 FG
1086.9
9.7
117.7
92.0
N A
70
6-21-93
LOT 1 FG
1080.8
12.5
111.6
90.0
N D
71
6-21-93
LOT 2 FG
1081.9
12.7
113.9
91.9
SC 0
72
6-21-93
LOT 3 FG
1082.5
12.6
113.6
91.6
N D
LEGEND:
N - NUCLEAR DENSOMETER
SC - SAND CONE
FG - FINISHED GRADE
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G¢oSoils, Inc.