HomeMy WebLinkAboutPD 2018-0036; SEHGAL RESIDENCE; FINAL SOILS REPORT; 2023-04-20GEOTECHNICAL ENGINEER.ING
FINAL GR.ADING
R.EPOR.T
JAY SEHGAL R.ESIDENCE
LOCATED AT
7129 A VIAR.A DR.IVE
CAR.LSBAD, CALIFOR.NIA 920ll
FOR.
MR_ JAY SEHGAL
4 2 COPPER. CR.EEK
IR. VINE, CALIFOR.NIA 92603
PR.OJECT NO: G-5505-02
APR.IL 20, 2023
GEOTECHNICAL SOLUTIONS, INC.
GEOTECHNICAL AND ENVIR.ONMENT AL
ENGINEER.ING
Sehgal Residence -Final Grading Report
Project No. G-5505-02
This report provides a summary of the field geotechnical observations and
compaction testing provided by this office during footing excavation, driveway
construction and trench backfill.
The pad grading was performed before and a rough grade report dated March 30,
2020, was prepared and was submitted.
Grading Procedure
For Grading Procedure please refer to our Rough Grading Report dated March 30,
2020.
Laboratory and Field Testing
The specified minimum degree of compaction was 90 percent of the ASTM D-1557
laboratory test standard. Laboratory testing including maximum density and optimum
moisture value determined for typical sample of the on-site soils during compaction
operations and was as follows:
Mechanical Analysis (ASTM D422)
The texture compositions of the upper material determined by the hydrometer test
method are as follows:
Soil Type Percent Percent Silt Percent Clay Sand
I-On-site, Light Gray Silty Sand 87 10 3
The on-site soils, sandstone bedrock and fragments are non-expansive.
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Sehgal Residence -Final Grading Report
Project No. G-5505-02
Maximum Density & Optimum Moisture (ASTM D1557)
Maximum density and optimum moisture contents were determined by the modified
Proctor (ASTM D-1557) laboratory test standard on the site sample used for
backfilling. Test results are as follows:
Soil Soil Type Location Max. Density Optimum Moisture
No. (pct) (%)
I. Silty Sand On-Site 119.0 10.0
Field Density Test (ASTM D-6938)
In-place compacted fill densities were determined in accordance with the current
ASTM D-6938 and Sand Cone D-1556 field test procedures. Test results are
tabulated on Table One and Table Two and approximate test locations are shown on
Plot Plan and Compaction Test Location Map (Plate B) in Appendix A.
It should be noted that test elevations and locations are approximate only, based upon
available field staking and plan information.
Footings of the Building
The bottoms of the footings were inspected by this office, they were extended into
sandstone bedrock. A field memo was issued, and the original memos are filed in our
office.
Subgrade Compaction (Driveway)
The locations for the subgrade tests at the driveway are shown on Plot Plan and
Compaction Test Location Map (Plate B, Appendix A) and the test results (Subgrade
tests 12 to 24) are summarized on Table One. The subgrade was compacted to
minimum 90 percent of ASTM D-1557 laboratory standard.
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Sehgal Residence -Final Grading Report
Project No. G-5505-02
Utility Trench
The sewer trench was backfilled with on-site material and was compacted to
minimum 90 percent of ASTM D-1557 laboratory standard. Test results (SI through
S6) are tabulated on Table Two and are plotted on Compaction Test Location Map
(Plate B) in Appendix A.
Conclusions and Recommendation
Based on the field observations and test results, it is concluded that the sewer trench
and driveway subgrade for proposed development covered in this report has been
accomplished in a satisfactory manner consistent with the project specifications and
pertinent recommendations presented in our Geotechnical Investigation Report dated
November 2, 2018, and the City of Carlsbad Grading Requirements, and is adequate
for its intended use.
The building was supported by continuous footings, minimum depth of 18 inches and
width of 18 inches extended into competent subgrade soils was designed for an
allowable bearing value of 2,500 pounds per square foot. Total settlement is
estimated to be less than 1/2" and differential settlement is estimated to be less than
1/4" under static loading conditions at a horizontal distance of 30 feet.
Remarks
Survey lines relative to the proposed development location and elevations were
established by others.
Inspection services provided by this office were based on the field visual observations
and field testing at random, in accordance with the standard of care applicable to
similar projects at the time work was done. However, our tests were taken on-site call
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Sehgal Residence -Final Grading Report
Project No. G-5505-02
Table One -Relative Compaction Summary
Driveway -Subgrade
Depth Below Relative
Test Date of Finish Surface Moisture Dry unit Comp.
No. Test (ft) (percent) Wt. (pcf) (%)
12 11/2/2020 0.5 8.5 107.1 90
13 11/2/2020 0.5 11.6 108.3 91
14 11/2/2020 0.5 8.3 109.5 92
15 11/2/2020 0.5 9.7 108.3 91
16 11/3/2020 0.5 9.2 107.1 90
17 11/3/2020 0.5 9.7 109.5 92
18 11/3/2020 0.5 11.1 107.1 90
19 11/3/2020 0.5 9.4 108.2 91
20 11/3/2020 0.5 9.5 109.5 92
21 11/3/2020 0.5 8.9 108.3 91
22 11/3/2020 0.5 8.8 108.2 91
23 11/3/2020 0.5 9.2 109.5 92
24 11/3/2020 0.5 9.2 109.4 92
Legends:
24 Subgrade Compaction Tests
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Soil Location
Type
I Driveway Pad
I "
I "
I "
I "
I "
I "
I "
I "
I "
I "
I "
I "
Sehgal Residence -Final Grading Report
Project No. G-5505-02
Table Two
Relative Compaction Summary of Subgrade
Utility Trench (Sewer)
Depth Below Relative
Test Date of Finish Surface Moisture Dry unit Comp.
No. Test (ft) (percent) Wt. (pct) (%)
S-1 3/11/2020 1.0 10.8 108.1 91
S-2 3/11/2020 1.0 13.3 107.5 90
S-3 3/11/2020 1.0 12.5 109.5 92
S-4 6/8/2021 0.5 12.3 110.0 92
S-5 6/8/2021 0.5 12.4 112.2 94
S-6 6/8/2021 0.5 12.6 107.1 90
Legends:
S-6 Utility Trench Compaction Tests
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Soil Location
Type
I Utility Trench
I II
I II
I II
I II
I "
Sehgal Residence -Final Grading Report
Project No. G-5505-02
APPENDIX A
Vicinity Map
Plot Plan & Compaction Test Locations Map
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