HomeMy WebLinkAboutTract Map 3883 Lot 110 Geotechnical Report & Compaction Results Rough Grading
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. Soil EngineeringandConsultingServices-EngineeringGeology. Compaction Testing
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. Geology. Water Resource Studies . Phase I & 1/ Environmental Site Assessments
ENVIRONMENTAL & GEOTECHNICAL ENGINEERING NETWORK
GEOTECHNICAL REPORT AND COMPACTION TEST RESULTS
ROUGH GRADING OPERATIONS
Brackin Custom House Pad
Lot 110 otTract 3883
Via Norte and La Corona Drive
City of Temecula, County of Riverside, California
Project Number: T1862-C
July 18, 2000
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RECEIVED
JUL 2 0 ZOOO
CITY OF TEMECULA
ENGINEERING DEPARTMENT
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Prepared for:
Mr. Tom Brackin
30680 La Sombra Court
Temecula, California 92591
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Mr. Tom Brackin
Project Number: T1862-C
TABLE OF CONTENTS
SECTION NUMBER AND TITLE
PAGE
1.0 SITE/PROJECT DESCRIPTION AND LOCATION ......................................................................1
1.1 PROJECT LOCATION.................................................................................................1
1.2 SITE DESCRIPTION ..................................................................................................2
1.3 PROJECT DESCRiPTION................................................................................... .........2
2.0 SCOPE OF WORK ..............................................................................................................2
2.1 TIME OF GRADING ...................................................................................................2
2.2 CONTRACTOR AND EQUIPMENT.............................................. ...................................2
2.3 GRADING OPERATIONS ....................................................... ......................... ............2
3.0 TESTING ...........................................................................................................................3
3.1 FIELD TESTING PROCEDURES................................................................................... 3
3.2 LABORATORY TESTING ................................... ........................ ........................... ....... 3
3.2.1 MOISTURE-DENSITY RELATIONSHIP TEST....................................................3
3.2.2 EXPANSION INDEX TEST .............................................................................3
4.0 EARTH MATERIALS ...........................................................................................................4
5.0 CONCLUSIONS AND RECOMMENDATIONS .............;..............................................................4
5.1 GENERAL.............. ................................. ............................................................. ...4
6.0 CLOSURE .........................................................................................................................5
ApPENDIX
TEST RESULTS
DRAWINGS
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EnGEN Corporation
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ENVIRONMENTAL & GEOTECHNICAL ENGINEERING NETWORK
July 18, 2000
Mr. Tom Brackin
30680 La Sombra Court
Temecula, California 92591
(909) 699-2462 I FAX (909) 245-6073
Attention:
Mr. Tom Brackin
Regarding:
GEOTECHNICAL REPORT AND COMPACTION TEST RESULTS
ROUGH GRADING OPERATIONS
Brackin Custom House Pad
Assessors Parcel Number: 919-072-008
Lot 11 0 of Tract 3883
Via Norte and La Corona Drive
City of Temecula, County of Riverside, California
Project Number: T1862-C
References:
1.
EnGEN Corporation, Limited Geotechnical Study, Proposed Single Family
Residence, Lot 110 of Tract 3883, Assessor's Parcel Number: 919-072-008,
Via Norte and La Corona Drive, City of Temecula, County of Riverside,
California, Project Number: T1862-LGS, report dated September 14, 1999.
Engineering Ventures, Inc., Precise Grading Plan, APN: 919-072-008,
Tract Map 3883, Lot 110, Plans dated December 1999.
2.
Dear Mr. Brackin:
According to your request and signed authorization, EnGEN Corporation has performed field
observations, sampling, and in-place density testing at the above referenced site. Submitted, herein,
are the test results and the supporting field and laboratory data.
1.0 SITE/PROJECT DESCRIPTION AND LOCATION
1.1
PROJECT LOCATION
The subject site consists of approximately one-half (0.5) acre located on the west corner of
Via Norte .and La Corona Drive in the City of Temecula, County of Riverside, California.
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Mr. Tom Brackin
Project Number: T1862-C
July 2000
Page 2
1.2 SITE DESCRIPTION
Prior to grading operations, topography and surface conditions of the site were moderately
sloping with surface drainage to the northwest at a gradient of 20 percent.
Reinforced concrete retaining walls had been built on the north and west sides of the
property since the time of the Referenced NO.1 Study. The walls range from 4-feet to 7-
feet in height. The northern wall has weep holes approximately 10-feet on center and had
been backfilled prior to grading.
1.3 PROJECT DESCRIPTION
It is understood that the subject site is to be developed with a one or two story single family
residence with slab-on-grade concrete floors supported on conventional continuous and
pier footings. The remainder of the site will consist of a driveway and associated
hardscape and landscape improvements.
2.0 SCOPE OF WORK
2.1 TIME OF GRADING
This report represents geotechnical observations and testing during the construction
operations from June 28, 2000 through July 14, 2000.
2.2 CONTRACTOR AND EQUIPMENT
The grading operations were performed by H. & H. Lackey & Sons through the use of one
(1) D8 dozer with slopeboard, one (1) D4 dozer with slope board, one (1) CAT 416
Backhoe, and one (1) skip loader.
2.3 GRADING OPERATIONS
Grading within the subject site consisted of a cut/fill and import fill operation. Grasses and
weeds were removed prior to fill placement. Fill material was generated from an offsite
source and from the southwestern cut portions of the site, and used to bring the fill slopes
and pad portions of the site to finish grade elevation. Removal of previously placed
unengineered backfill material was performed adjacent to the retaining wall along the
northern portion of the site. Clean %-inch gravel and geofabric were used to create a
suitable drain behind the walls. Removal of alluvium, slopewash, etc., was performed to a
depth of 3-feet below original elevation. Over-excavated earth material was used as fill.
Bottoms were observed, probed and found to be into competent soil by a representative of
this firm. Keying and benching into competent soil was observed during the grading
A.
. EnGEN Corpo1'2tion
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Mr. Tom Brackin
Project Number: T1862-C
July 2000
Page 3
operations. Over-excavation was performed in the shallow fill portions of the building pad
to a depth of 5-feet below finish grade elevation and to a distance of 5-feet outside the
proposed structure. The exposed bottoms were scarified and moisture conditioned to a
depth of 12-inches then compacted to 90 percent. Fill was placed in lens thicknesses of 6
to 8-inches, thoroughly moisture conditioned to near optimum moisture content, then
compacted to a minimum of 90 percent relative compaction. Moisture conditioning of the
on-site soils was performed during the compaction process, through the use of a fire hose.
The pad area was generally graded to the elevations noted on the Grading Plan. However,
the actual pad location, dimensions, elevations. slope locations and inclinations, etc. were
surveyed and staked by others and should be verified by the Project Civil Engineer.
3.0 TESTING
3.1 FIELD TESTING PROCEDURES
Field in-place density and moisture content testing were performed in general accordance
with ASTM-D-2922-81 (90) and ASTM-D-3017-88 procedures for determining in-place
density and moisture content, respectively, using nuclear gauge equipment. Relative
compaction test results were within the 90 percent required for all material tested which is
an indication that the remainder of the fill placed has been properly compacted. Test
results are presented in the Appendix of this report. Fill depths and test locations were
detenmined from review of the referenced grading plans.
3.2 LABORATORY TESTING
The following laboratory tests were performed as part of our services during the grading of
the subject site. The test results are presented in the Appendix of this report.
3~2.1 Moisture-Density Relationship Test
Maximum'dry density - optimum moisture content relationship tests were conducted on
samples of the materials used as fill. The tests were performed in general accordance with
ASTM D1557-91 procedures. The test results are presented in the Appendix (Summary of
Optimum Moisture Content I Maximum Dry Density Relationship Test Results).
3;2:2 Expansion Index Test
A soil sample was obtained for expansion potential testing from the building pad area upon
completion of rough grading of the subject site. The expansion test procedure utilized was
the Uniform Building Code Test Designation 18-2. The material tested consisted of brown
silty sand, ,which has an Expansion Index of 6. This soil is classified as having a very low
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EnGEN Corporation
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Mr. Tom Brackin
Project Number: T1862-C
July 2000
Page 4
expansion potential. The results are presented in the Appendix (Summary of Expansion
Index Test Results).
4.0 EARTH MATERIALS
The natural and imported earth materials encountered on-site, generally consisted of brown
silty sand.
5.0 CONCLUSIONS AND RECOMMENDATIONS
No conditions were encountered which would cause a change in the previously provided
design and construction recommendations. As a result, design and construction should
adhere to the recommendations provided in the Referenced No. 1 Updated Geotechnical
Study.
5.1 GENERAL
Based on the observations and tests performed during grading, the subject site in the
areas noted as test locations has been completed in accordance with the Referenced No. 1
report, the project plans and the Grading Code of the City of Temecula. The graded site,
in the areas noted as graded, is determined to be adequate for the support of a typical
residential development. Any subsequent grading for development of the subject property
should be performed under engineering observation and testing performed by EnGEN
Corporation. Subsequent grading includes, but is not limited to, any additional fill
placement and excavation of temporary and permanent cut and fill slopes. In addition,
EnGEN Corporation should observe all foundation excavations. Observations should be
made prior to installation of concrete forms and/or reinforcing steel so as to verify and/or
modify, if necessary, the conclusions and recommendations in this report. Observations of
overexcavation cuts, fill placement, finish grading, utility or other trench backfill, pavement
subgrade ,and base course, retaining wall backfill, slab presaturation, or other earth work
completed for the development of subject site should be performed by EnGEN
Corporation. If any of the observations and testing to verify site geotechnical conditions
are not performed by EnGEN Corporation, liability for the safety and performance of the
development is limited to the actual portions of the project observed and/or tested by
EnGEN Corporation.
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EnGEN Corporation
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Mr. Tom Brackin
Project Number: T1862-C
July 2000
Page 5
6.0 CLOSURE
This report has been prepared for use by the parties or project named or described above.
It mayor may not contain sufficient information for other parties or purposes. The findings
and recommendations expressed in this report are based on field and laboratory testing
performed during the rough grading operation and on generally accepted engineering
practices and principles. No further warranties are implied or expressed beyond the direct
representations of this report.
Thank you for the opportunity to provide these services. If you should have any questions
regarding this report, please do not hesitate to contact this office at your convenience.
Respectfully submitted,
7;;Z;Y
Ryan Waroff 7'
Supervising Technician
RW/OB:rr
Qistribution: (4) Addressee
F.llE: EnGEN/ReportingfT1862-C Tom Brackin, Rough Grading
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EnGEN Corporation
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APPENDIX:
TEST RESULTS
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Mr. Tom Brackin
Project Number: T1862-C
Appendix Page 1
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EnGEN Corporation
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Mr. Tom Brackin
Project Number: T1 B62-C
Appendix Page 2
FIELD rEST RESULTS
(Summary of Field In-Place Density Test Results)
(Nuclear Gauge Test Method)
(5. G.) = Subgrade / (F. G.) = Finish Grade
Test Depth Soil Max Moisture Dry Relative Required
Test Date Test Locations Elevation Type Density Content Density Compaction Compaction
No. (2000) (FT) (PCF) (%) (PCF) (%) (%)
1 06,-29 Fill Slope 1167 Al 128.5 6.5 122.3 95.2% 90.0%
2 06:-29 Fill Slope 1169 Al 128.5 7.0 116.5 90.7% 90.0%
3 06:-29 Fill Slope 1170 Al 128.5 7.6 116.9 91.0% 90.0%
4 06:-29 Fill Slope 1171 Al 128.5 12.5 117.2 91.2% 90.0%
5 06,29 Fill Slope 1172 Al 128.5 10.2 117.8 91.7% 90.0%
6 07~03 Fill Slope 1174 A1 128.5 10.2 117.2 91.2% 90.0%
7 07'03 Fill Slope 1174 Al 128.5 9.8 116.5 90.7% 90.0%
8 07'03 Fill Slope 1176 A1 128.5 10.4 116.0 90.3% 90.0%
9 07'03 Fill Slope 1178 Al 128.5 9.7 117.3 91.3% 90.0%
10 07" 11 Fill Slope 1180 A2 128.9 11.9 116.2 90.1% 90.0%
11 07.11 Fill Slope 1181 A2 128.9 13.0 118.9 92.2% 90.0%
12 07.11 Fill Slope 1183 A2 128.9 12.2 119.9 93.0% 90.0%
13 07+11 Garage Pad 1188 A2 128.9 11.8 120.4 93.4% 90.0%
14 07+12 Fill Slope 1185 A2 128.9 11.6 121.6 94.3% 90.0%
15 07"12 Pool f?ad 1186 A2 128.9 12.4 119.4 92.6% 90.0%
16 07"12 House ;Pad 1190 A2 128.9 10.6 120.6 93.6% 90.0%
17 07+13 House :Pad 1192 A2 128.9 9.6 119.4 92.6% 90.0%
18 07"13 House Pad 1194 A2 128.9 9.3 117.8 91.4% 90.0%
19 07'13 House Pad F.G. A2 128.9 8.8 116.1 90.1% 90.0%
20 07-13 House Pad F.G. A2 128.9 10.7 118.0 91.5% 90.0%
21 07-13 Garage: Pad F.G. A2 128.9 12.1 118.3 91.8% 90.0%
22 07-13 Pool Pad F.G. A2 128.9 10.1 116.6 90.5% 90.0%
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EnGEN Corporation
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Mr. Tom Brackin
Project Number: T1862-C
Appendix Page 3
SUMMARY OF OPTIMUM MOISTURE CONTENT
AXIMUM DRY DENSITY RELATIONSHIP TEST RESULT
ASTM 01557-91
Maximum Dry Optimum
Soil Description (USCS Symbol) Soil Type Density (PCF) Moisture
Content (%)
Silty Sand Brown, (SM) A1 128.5 8.8
Silty Sand Brown, (SM) A2. 128.9 9.9
SUMMARY OF EXPANSION INDEX TEST RESULTS
USC 18-2
Moisture Moisture
Soil Depth (FT) Dry Density Condition Condition Expansion
Type (pef) Before Test After Test Index
1%1 (%l
E-1 -1 114.4 7.9% 14.7% 6
\f)
EnGEN Corporation
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APPENDIX:
DRAWINGS
Mr. Tom Brackin
Project Number: T1862-C
Appendix Page 4
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EnGEN Corporation