HomeMy WebLinkAboutCT 2021-0002; Garfield Beach Homes; FINAL SOILS REPORT; 2025-03-10
GEOTECHNICAL | ENVIRONMENTAL | MATERIALS
March 10, 2025
Project No. 3830-SD
Rincon Homes
5315 Avenida Encinas, Suite 200
Carlsbad, CA 92008
Attention: Mr. Stuart Hatch
Subject: Final Report of Post Grading Geotechnical Testing and Observation Services
3570 Garfield Street
Carlsbad, California 92008
References: See Page 4
Dear Mr. Hatch:
We are pleased to present the results of our geotechnical testing and observation services
during post grading construction associated with the subject project. The subject project is
located at 3570 and 3588-3590 Garfield Street, Carlsbad, California.
Post grading of the subject homes has been completed under the observation of, and with
selective testing by GeoTek. It is to the best of our knowledge that site post grading presented
in this report has been completed in general accordance with the approved geotechnical
reports (Hetherington, 2021) for the site, applicable provisions of the 2019 California Building
Code (CBC) and City of Carlsbad guidelines.
This report provides a summary of site conditions observed during the post grading
construction for the subject homes.
Rincon Homes April 10, 2025
3570 Garfield Street – Post-grading Compaction Report Project No. 3830-SD
Carlsbad, California Page 2
SUMMARY OF GEOLOGIC AND SOILS CONDITIONS
Based on our field observations and testing during post grading site construction, we noted the
following:
Visual classification of the soil in the field, compared to the soil description from
laboratory testing, was the basis for determining the maximum dry density value and
optimum moisture content applied to each soil density test.
The backfill materials for sewer, storm drain, water, and dry utilities were moisture
conditioned to near optimum moisture content and compacted to at least 90% of the
maximum dry density as determined by ASTM D 1557 test procedures.
Subgrade for curb and gutter, street grade and aggregate base (AB) and asphalt concrete
(AC) was observed and tested to be at least 95% relative compaction.
The new overlay of asphalt concrete along Garfield Street was observed and tested,
with results indicating densities of at least 95% relative compaction.
Curb to house utility connection trench backfill was observed and tested to be to be at
least 90% relative compaction as determined by ASTM D1557 test procedures.
Foundation footing excavations for residential buildings were qualitatively evaluated with
a soil probe in random locations and found to be firm and unyielding. Building
foundation excavations were found to be in suitable bearing material comprised of
engineered fill.
Subgrade for sidewalks were observed and tested to be at least 90% relative compaction
as determined by ASTM D1557 test procedures.
FIELD TESTING
Field density tests were taken at periodic intervals and random locations to verify the
compaction efforts by the grading contractor. The field density testing for the subject site was
performed using a portable nuclear gauge, in general accordance with testing procedure ASTM
D 6938.
LABORATORY TESTING
Rincon Homes April 10, 2025
3570 Garfield Street – Post-grading Compaction Report Project No. 3830-SD
Carlsbad, California Page 3
Moisture-Density Relationships
The laboratory maximum dry density and optimum moisture content for the soils were
determined in general accordance with test method ASTM D 1557. The table below presents
the soil type used for this project. The laboratory maximum density for asphalt concrete
mixtures and aggregate base were provided by the laboratory department of the supplier.
SUMMARY OF LABORATORY MAXIMUM DRY DENSITY
AND OPTIMUM MOISTURE CONTENT TEST RESULTS (ASTM D 1557)
Soil Type Maximum
Density (pcf)
Optimum
Moisture Description
A 125.0 9.5 Brown F-M Silty Sand
HE-1 125.5 10 Base, Dark Grayish Brown Gravelly Silty Sand
I-1 126.0 7.5 Base, Plant provided
I-2 131.0 8.2 Base, Gravelly Silty Sand
CMB-1 121.2 10.8 Base, Plant provided
CMB-2 120.8 8.8 Base -CMB
CMB-3 122.0 10.2 Import and Native Mix
CMB-4 119.0 11.8 Plant provided +/- 1
AC-1 149.0 - Plant provided
AC-2 145.0 - Plant provided +/- 2
AC-3 145.8 - Plant provided +/- 2
CONCLUSIONS AND LIMITATIONS
The purpose of this report is to present a summary of observation and testing services
provided by this firm during post grading operations that were performed on the subject site.
It is our professional opinion that the subject project is suitable from a geotechnical
perspective. .
Our observations were performed in such a manner as to be reasonably certain that the soils
tested are representative of the work, and that the work, in general, essentially complies with
the job requirements. Our services were performed in accordance with engineering principles
generally accepted at this time and in this area. No warranty is expressed or implied.
This report is subject to review by the controlling authorities for this project. GeoTek accepts
neither responsibility nor liability for work, testing, or recommendations performed or
provided by others.
Rincon Homes April 10, 2025
3570 Garfield Street – Post-grading Compaction Report Project No. 3830-SD
Carlsbad, California Page 4
The opportunity to be of service is sincerely appreciated. If you should have any questions,
please do not hesitate to call our office.
Respectfully submitted,
GeoTek, Inc.
Christopher D. Livesey Edwin R. Cunningham
CEG 2733, Exp. 05/31/25 RCE 81687, Exp. 03/31/26
Vice President Project Engineer
Distribution: (1) Addressee via email
Attachments: Appendix A – Rough Grade Report
Table 1 – Summary of Subgrade Density Tests
Table 2– Summary of Aggregate Base Density Tests
Table 3 – Summary of Asphalt Concrete Density Tests
Table 4 – Summary of Sewer Backfill Density Tests
Table 5 – Summary of Water Backfill Density Tests
Table 6 – Summary of Dry Utilities Backfill Density Tests
SELECTED REFERENCES
Hetherington Engineering, Inc., 2021, Geotechnical Investigation and Infiltration Testing
Proposed Residential Development 3570 & 3588-3590 Garfield Street, Project No. 9235.1,
Dated July 14, 2021
California Building Standards Commission, 2022, California Building Code
GeoTek, Inc., 2024, “Summary of Geotechnical Observation and Testing, Rough Grade, 3570
Garfield Street, Carlsbad, California 92008,” PN 3830-SD, dated January 26, 2024.
Pasco Laret Suiter & Associates, 2022, “As Built Grading Plans For: Garfield Beach Homes,
3570 Garfield Street,) 9 sheets, dated March 31, 2025.
1384 Poinsettia Avenue, Suite A
Vista, California 92081
Rincon
3570 and 3588-3590 Garfield
Carlsbad, California 92008
PN: 3830-SD April 2025
Figure 1
Post Grading
Compaction Test
Map
Legend
Approximate Field Density (Compaction) Test Locations
Subgrade Field Density Tests Sewer Field Density Tests
Base Field Density Tests Water Field Density Tests
Asphalt Field Density Tests Dry Utility Field Density Tests
Old Paralic Deposits, Circled Where Buried
Engineered Fill Where Placed
Limits of Fill, This Report
SG-26
Af
Qop
AB-31
AC-23
S-4
W-9
D-10
SG-1
SG-2
SG-3
SG-4
SG-5
SG-6 SG-7
SG-8
SG-9
SG-10
SG-11
SG-12
SG-13
SG-14
SG-15
SG-16
SG-17
SG-18
SG-19
SG-20
SG-21
SG-22
SG-23
SG-24
SG-25
SG-26
AB-1
AB-2 AB-3
AB-4AB-5
AB-6
AB-7
AB-8 AB-9
AB-10 AB-11
AB-12
AB-13
AB-14
AB-15
AB-16
AB-17
AB-18
AB-19
AB-20
AB-22
AB-23
AB-21
AB-24
AB-25
AB-29
AB-30
AB-28
AB-27 AB-26
AB-31 AB-31A
AC-1
AC-3
AC-2
AC-4
AC-5
AC-6
AC-7
AC-8
AC-9
AC-10
AC-11
AC-12
AC-16
AC-15
AC-14
AC-13
S-4
S-1
S-2
S-3
W-9
W-1
W-2W-3W-4W-5W-6 W-7W-8
D-10
D-1
D-2
D-3
D-4
D-5
D-6
D-7
D-8
D-9
AC-17
AC-18
AC-19
AC-20
AC-21
AC-22
AC-23
Af
Qop
Rincon Homes
3570 Garfield Street
Carlsbad, CA
GeoTek, Inc.
Subgrade 4/9/2025
Project No.: 3830-SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Dry
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
03/06/24 1 Sewerline near road SG 10.5 112.9 HE-1 125.5 N 90
10/06/23 2 Enterance of Property (H20Line) SG 7.5 122.3 I-1 126.0 N 97
10/06/23 3 Sidewalk (H20Line) SG 7.8 121.1 I-1 126.0 N 96
03/19/24 4 H2O Tie-In Eastern end of site SG 9.8 118.1 HE-1 125.5 N 94
03/19/24 5 H2O Tie-In Eastern end of site SG 9.5 118.4 HE-1 125.5 N 94
03/19/24 6 H2O Tie-In Middle of site SG 9.7 117.6 HE-1 125.5 N 94
03/19/24 7 H2O Tie-In Middle of site SG 9.8 118.1 HE-1 125.5 N 94
03/19/24 8 H2O Tie-In western end SG 10.2 116.8 HE-1 125.5 N 93
03/19/24 9 H2O Tie-In western end SG 9.6 116.7 HE-1 125.5 N 93
03/26/24 10 Water-line trench SG 10.2 120.1 BC 122.0 N 98
03/28/24 11 Water-line trench (Near Enterance) SG 10.6 118.7 BC 122.0 N 97
03/28/24 12 Water-line trench (Near Enterance) SG 10.9 117.9 BC 122.0 N 97
03/28/24 13 Water-line trench (T-Crossing SG 10.4 119.1 BC 122.0 N 98
02/25/25 14 Street Subgrade btwn Units 5/8 SG 8.2 128.8 I-2 131.0 N 99
02/25/25 15 Street Subgrade btwn Units 4-9 SG 8.3 127.8 I-2 131.0 N 98
02/25/25 16 Street Subgrade btwn Units 3-10 SG 9.1 129.2 I-2 131.0 N 99
03/18/25 17 Sidewalk South End SG 9.2 113.5 A 125.5 N 90
03/18/25 18 Sidewalk 15 ft North of South End SG 9.7 113.2 A 125.5 N 90
03/18/25 19 Sidewalk North End SG 9.8 114.1 A 125.5 N 91
03/18/25 20 Sidewalk 15 ft South of North End SG 10.1 115.3 A 125.5 N 92
03/18/25 21 Driveway Approach SG 9.6 119.8 A 125.5 N 95
03/18/25 22 Driveway Approach SG 10.2 120.0 A 125.5 N 96
03/19/25 23 Street Adjacent to Curb North End SG 9.0 120.1 A 125.5 N 96
03/19/25 24 Street Adjacent to Curb Center SG 9.8 119.6 A 125.5 N 95
03/19/25 25 Street Adjacent to Curb Center SG 10.1 120.6 A 125.5 N 96
03/19/25 26 Street Adjacent to Curb South End SG 9.5 120.4 A 125.5 N 96
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Subgrade
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
Rincon Homes
3570 Garfield Street
Carlsbad, CA
GeoTek, Inc.
Base 4/9/2025
Project No.: 3830-SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Dry
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
03/05/24 1 Center of St. AB 10.0 117.0 CMB-3 122.0 N 96
03/08/24 2 Subgrade for sewer trench AB 9.8 120.4 CMB-1 121.2 N 99
03/08/24 3 Subgrade for sewer trench AB 11.1 119.8 CMB-1 121.2 N 99
03/08/24 4 Subgrade for sewer trench AB 12.2 119.6 CMB-1 121.2 N 99
03/11/24 5 Sewer Trench Near Entrance AB 12.5 115.4 CMB-1 121.2 N 95
03/11/24 6 Sewer Trench Near Entrance AB 10.9 113.5 CMB-1 121.2 N 94
03/11/24 7 Sewer Trench Near Entrance AB 10.2 113.8 CMB-1 121.2 N 94
03/12/24 8 Sewer Trench Near Entrance AB 11.4 114.4 CMB-1 121.2 N 94
03/12/24 9 Sewer Trench Near Entrance AB 12.2 113.8 CMB-1 121.2 N 94
03/26/24 10 Water-line trench AB 10.2 120.1 CMB-3 122.0 N 98
03/28/24 11 Water-line trench (Near Enterance) AB 10.6 118.7 CMB-3 122.0 N 97
03/28/24 12 Water-line trench (Near Enterance) AB 10.9 117.9 CMB-3 122.0 N 97
03/28/24 13 Water-line trench (T-Crossing AB 10.4 119.1 CMB-3 122.0 N 98
04/09/24 14 Water Line Tie in Garfield St AB 7.6 117.9 CMB-1 121.2 N 97
04/10/24 15 Utility Backfill Garfield St AB 7.3 116.1 CMB-1 121.2 N 96
08/27/24 16 Garfield St. South-Bound AB 9.9 117.6 CMB-1 121.2 N 97
08/27/24 17 Garfield St. South-Bound AB 9.5 117.1 CMB-1 121.2 N 97
08/27/24 18 Garfield St. South-Bound AB 10.2 116.6 CMB-1 121.2 N 96
08/27/24 19 Garfield St. South-Bound AB 9.5 117.4 CMB-1 121.2 N 99
08/27/24 20 Garfield St. South-Bound AB 10.4 117.7 CMB-1 121.2 N 97
10/10/24 21 Garfield St AB 7.8 115.6 CMB-2 120.8 N 96
10/10/24 22 Garfield St AB 8.6 117.2 CMB-2 120.8 N 97
10/10/24 23 Garfield St AB 9.1 115.3 CMB-2 120.8 N 95
10/10/24 24 Garfield St AB 9.6 115.7 CMB-2 120.8 N 96
03/18/25 25 Driveway Approach AB 13.0 114.2 CMB-4 119.0 N 96
03/18/25 26 Driveway Approach AB 13.8 113.8 CMB-4 119.0 N 96
03/18/25 27 Driveway Approach AB 12.8 114.5 CMB-4 119.0 N 96
03/19/25 28 Garfield St next to curb North End AB 12.0 113.5 CMB-4 119.0 N 95
03/19/25 29 Garfield St next to curb North/Center AB 12.5 114.1 CMB-4 119.0 N 96
03/19/25 30 Garfield St next to curb South/Center AB 13.0 114.5 CMB-4 119.0 N 96
03/19/25 31 Garfield St next to curb South End AB 12.8 110.3 CMB-4 119.0 N 93
03/19/25 31A Retest of Test 31 AB 12.5 113.2 CMB-4 119.0 N 95
TABLE 2
SUMMARY OF FIELD DENSITY TESTS
Base
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
Rincon Homes
3570 Garfield Street
Carlsbad, CA
GeoTek, Inc.
Asphalt 4/9/2025
Project No.: 3830-SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Total
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
08/27/24 1 Garfield St. South-Bound AC - 142.8 AC-1 149.0 N 96
08/27/24 2 Garfield St. South-Bound AC - 143.1 AC-1 149.0 N 96
08/27/24 3 Garfield St. South-Bound AC - 142.5 AC-1 149.0 N 96
08/27/24 4 Garfield St. South-Bound AC - 142.1 AC-1 149.0 N 95
08/27/24 5 Garfield St. South-Bound AC - 142.7 AC-1 149.0 N 96
08/27/24 6 Garfield St. South-Bound AC - 141.8 AC-1 149.0 N 95
08/27/24 7 Garfield St. South-Bound AC - 143.5 AC-1 149.0 N 96
10/10/24 8 Garfield St AC - 137.8 AC-2 145.0 N 95
10/10/24 9 Garfield St AC - 140.7 AC-2 145.0 N 97
10/10/24 10 Garfield St AC - 141.3 AC-2 145.0 N 97
10/10/24 11 Garfield St AC - 137.8 AC-2 145.0 N 95
03/20/25 12 North End next to Curb (Garfield) FG-3' - 140.2 AC-3 145.8 N 96
03/20/25 13 South End next to Curb (Garfield) FG-3' - 139.1 AC-3 145.8 N 95
03/20/25 14 Center Next to Curb (Garfield) FG-3' - 138.6 AC-3 145.8 N 95
03/20/25 15 North End next to Curb (Garfield) FG - 139.5 AC-3 145.8 N 96
03/20/25 16 Center Next to Curb (Garfield) FG - 139.3 AC-3 145.8 N 96
03/20/25 17 South End next to Curb (Garfield) FG - 138.7 AC-3 145.8 N 95
03/24/25 18 Garfield St. FG - 143.8 AC-1 149.0 N 96
03/24/25 19 Garfield St. FG - 142.7 AC-1 149.0 N 96
03/24/25 20 Garfield St. FG - 142.3 AC-1 149.0 N 96
03/24/25 21 Garfield St. FG - 143.0 AC-1 149.0 N 96
03/24/25 22 Garfield St. FG - 143.7 AC-1 149.0 N 96
03/24/25 23 Garfield St. FG - 142.8 AC-1 149.0 N 96
TABLE 3
SUMMARY OF FIELD DENSITY TESTS
Asphalt
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
Rincon Homes
3570 Garfield Street
Carlsbad, CA
GeoTek, Inc.
Sewer 4/9/2025
Project No.: 3830-SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Dry
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
03/05/24 1 Center of St. -3' 10.0 110.7 CMB-3 122.0 N 90
03/05/24 2 Center of St. -1' 10.0 115.0 CMB-3 122.0 N 94
03/06/24 3 Sewerline near road -4' 10.5 114.1 HE-1 125.5 N 90
03/06/24 4 Sewerline near road -1.5' 10.5 115.2 HE-1 125.5 N 92
TABLE 4
SUMMARY OF FIELD DENSITY TESTS
Sewer
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
Rincon Homes
3570 Garfield Street
Carlsbad, CA
GeoTek, Inc.
Water 4/9/2025
Project No.: 3830-SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Dry
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
10/06/23 1 Enterance of Property (H20Line) -1SG 7.2 119.6 I-1 126.0 N 95
05/13/24 2 Unit-7 Interior trench 56.5 10.3 113.3 HE-1 125.5 N 93
05/13/24 3 Unit-7 Interior trench 56.5 10.6 112.9 HE-1 125.5 N 90
05/14/24 4 Unit-8 Interior trench 56.5 10.2 113.3 HE-1 125.5 N 90
05/14/24 5 Unit-9 Interior trench 56.5 10.0 112.9 HE-1 125.5 N 90
05/14/24 6 Unit-10 Interior trench 57.0 10.8 113.7 HE-1 125.5 N 91
05/14/24 7 Unit-10 Interior trench 57.5 10.3 114.8 HE-1 125.5 N 91
05/15/24 8 Unit-11 Interior trench 56.5 10.8 114.6 HE-1 125.5 N 91
05/15/24 9 Unit-12 Interior trench 56.5 10.2 115.0 HE-1 125.5 N 92
TABLE 5
SUMMARY OF FIELD DENSITY TESTS
Water
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
Rincon Homes
3570 Garfield Street
Carlsbad, CA
GeoTek, Inc.
Dry Utilities 4/9/2025
Project No.: 3830-SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Dry
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
06/25/24 1 Gasline Backfill -3'9.5 119.2 HE-1 125.5 N 95
06/25/24 2 Gasline Backfill -2.5'9.3 119.5 HE-1 125.5 N 95
06/25/24 3 Gasline Backfill -1.5'8.8 119.7 HE-1 125.5 N 95
06/25/24 4 Gasline Backfill FG 8.0 119.5 HE-1 125.5 N 95
06/26/24 5 Joint Trench-East near R. Wall -2'12.6 118.8 HE-1 125.5 N 95
06/26/24 6 Joint Trench-East near R. Wall FG 12.2 116.4 HE-1 125.5 N 93
10/10/24 7 Garfield St SG 9.8 120.0 A 126.0 N 95
10/10/24 8 Garfield St SG 9.3 124.9 A 126.0 N 99
10/10/24 9 Garfield St SG 9.4 123.2 A 126.0 N 98
10/10/24 10 Garfield St SG 9.2 120.8 A 126.0 N 96
TABLE 6
SUMMARY OF FIELD DENSITY TESTS
Dry Utilities
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
APPENDIX A
AS-GRADED REPORT
GEOTECHNICAL | ENVIRONMENTAL | MATERIALS
January 26, 2024
Project No. 3830-SD
Rincon Homes
5315 Avenida Encinas, Suite 200
Carlsbad, CA 92008
Attention: Mr. Stuart Hatch
Subject: Summary of Geotechnical Observation and Testing
Rough Grading
3570 Garfield Street
Carlsbad, California 92008
Dear Mr. Hatch:
In accordance with your request, GeoTek, Inc. (GeoTek) has prepared this letter to certify the
completion of the earthwork construction associated with the subject property located at 3570
and 3588-3590 Garfield Street, Carlsbad, California. It is to the best of GeoTek’s knowledge
that remedial grading of the subject pad presented in this report has been completed in general
accordance with the approved geotechnical reports (Hetherington, 2021) for the site, applicable
provisions of the 2019 California Building Code (CBC) and City of Carlsbad guidelines. This
report provides a brief summary of site conditions observed during the rough grading for the
subject pads.
SUMMARY OF GEOLOGIC AND SOILS CONDITIONS
Remedial grading of the subject building pad was performed under the observation of,
and with selective testing, by GeoTek, Inc. (GeoTek) between the approximate dates of
September 13, 2023, and January 12, 2024.
Unsuitable earth material was removed to competent suitable bottoms as observed by a
representative of GeoTek. The approximate limits of grading and bottoms elevations
and locations are plotted on the enclosed As-Graded Geotechnical Map (Figure 1).
A concrete septic tank was encountered along the southern property boundary. The
septic tank was excavated and removed from the site and the void was replaced with
engineered fills.
RINCON HOMES January 26, 2024
Summary of Geotechnical Observations and Testing Project No. 3830-SD
3570 Garfield Street, Carlsbad, CA Page 2
A GeoTek representative observed exposed soil bottoms to be scarified to a depth of
12-inches, moisture conditioned, and compacted to a minimum 90 percent relative
compaction prior to receiving engineered fill.
On site material generated during remedial grading and imported soil was placed as
engineered fills.
Retaining wall foundations were observed and found to be firm and unyielding.
Retaining walls were backfilled with onsite material generated during remedial grading
and imported soil was placed as engineered retaining wall backfills.
Visual classification of the soil in the field, compared to the soil description from
laboratory testing was the basis for determining the maximum dry density value and
optimum moisture content applied to each soil density test.
Field density tests indicated the engineered fill and retaining wall backfill was placed and
compacted to at least 90% and near optimum moisture content relative to ASTM D
1557. Fill placement procedure was observed to be in accordance with the approved
geotechnical report for the subject property.
FIELD AND LABORATORY TESTING
FIELD TESTING
Field density tests were taken at periodic intervals and random locations to check the
compaction efforts by the grading contractor performing compaction of engineered fill. The
field density testing for the subject site was performed using a nuclear densometer gauge, in
general accordance with testing procedure ASTM D 6938 for soils. The results of the field
density testing conducted for the herein reported site area are included in the attached Table 1
and presented on Figure 1.
LABORATORY TESTING
The laboratory maximum dry density and optimum moisture content for the soils were
determined in general accordance with test method ASTM D 1557. The table below presents
the soil type used for this project.
RINCON HOMES January 26, 2024
Summary of Geotechnical Observations and Testing Project No. 3830-SD
3570 Garfield Street, Carlsbad, CA Page 3
SUMMARY OF LABORATORY MAXIMUM DRY DENSITY
AND OPTIMUM MOISTURE CONTENT TEST RESULTS (ASTM D 1557)
Soil Type Description Maximum Dry
Density (pcf)
Optimum Moisture
Content (%)
HE-1 Dark Brown Silty SAND 125.5 10.0
A Brown Silty SAND 125.0 9.5
I-1 Brown Silty SAND 126.0 7.5
I-2 Brown Well Graded SAND 131.0 8.2
CONCLUSIONS
Site grading has been completed in general accordance with the approved geotechnical report
(Hetherington, 2021), applicable provisions of the 2019 California Building Code (CBC) and
City of San Diego guidelines.
If a significant amount of time elapses between the grading and reprocessing reported as part of
this report and start of home construction, building pads may require additional reprocessing.
The reprocessing should include moisture conditioning to a minimum content of optimum
moisture based on ASTM D1557 and to a depth of at least 12-inches prior to excavation of
foundation footings.
RINCON HOMES January 26, 2024
Summary of Geotechnical Observations and Testing Project No. 3830-SD
3570 Garfield Street, Carlsbad, CA Page 4
Closure
The opportunity to be of service is sincerely appreciated. If you should have any questions,
please do not hesitate to call our office.
Respectfully submitted,
GeoTek, Inc.
Christopher D. Livesey
CEG 2733, Exp. 05/31/25
Vice President
Edwin R. Cunningham
RCE 81687, Exp. 03/31/24
Project Engineer
Distribution: (1) Addressee via email
Enclosures: Figure 1 – Field Density Test Location Map
Table 1 – Field Density Tests
REFERENCES
California Building Standards Commission, 2019, California Building Code
Hetherington Engineering, Inc., 2021, Geotechnical Investigation and Infiltration Testing
Proposed Residential Development 3570 & 3588-3590 Garfield Street, Project No.
9235.1, Dated July 14, 2021
Pasco Laret Suiter & Associates, 2022, “Preliminary Grading Plans For: Garfield Beach
Homes, 3570 Garfield Street,) 3 sheets, undated.
1384 Poinsettia Avenue, Suite A
Vista, California 92081
Rincon
3570 and 3588-3590 Garfield
Carlsbad, California 92008
PN: 3830-SD January 2024
Figure 1
As-Graded
Compaction Test
Map
1
2
3
4
5
6
7
89
10 11
12
13
14
15
15A
16
17
18
19
20
21
22
2324
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41 4243
44
45
46
47
48
Legend
Approximate Field Density
(Compaction) Test Location
Approximate Elevation of
Removal Bottom
Engineered Fill Placed Under
Observation & Testing By GeoTek,
This Report
Old Paralic Deposits, Circled
Where Buried
Limits of Fill, This Report
355.2
57
Af
Qop
47
47
50
50
55
55
Af
Af
Af
Af
Qop
Qop
Qop
Qop
CLIENT
Project Name
Location, CA
GeoTek, Inc.
Grading 1/29/2024
Project No.: 3-SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Dry
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
09/14/23 1 East Side 49.0 13.2 117.1 A 125.0 N 94
09/14/23 2 East Side 49.0 9.8 119.7 A 125.0 N 96
09/15/23 3 East Side 48.0 11.1 121.2 A 125.0 N 97
09/15/23 4 East Side 47.0 7.3 119.8 A 125.0 N 96
09/15/23 5 East Side 47.0 8.2 124.9 A 125.0 N 99
09/21/23 6 North End 56.0 9.0 124.5 A 125.0 N 99
09/21/23 7 South End 56.0 12.1 113.1 A 125.0 N 91
09/26/23 8 Right site entrance 58.0 10.9 113.6 A 125.0 N 91
09/26/23 9 Right site entrance 57.0 10.7 113.9 A 125.0 N 91
09/26/23 10 Right site entrance 59.0 9.7 121.2 A 125.0 N 97
09/26/23 11 Right site middle of pad 55.0 9.0 115.8 A 125.0 N 93
09/26/23 12 Right site middle of pad 56.0 9.7 118.0 A 125.0 N 94
09/26/23 13 Right site middle of pad 58.0 9.8 117.8 A 125.0 N 92
09/26/23 14 Left side of entrance 56.0 6.8 117.2 A 125.0 N 94
09/26/23 15 Left side of entrance 56.0 6.9 110.8 A 125.0 N 88
09/26/23 15A Left side of entrance 56.0 6.7 113.6 A 125.0 N 91
09/27/23 16 Left side of entrance 57.0 7.6 114.5 HE-1 125.5 N 91
09/27/23 17 Left side of entrance 59.0 9.4 118.0 HE-1 125.5 N 94
09/27/23 18 Left Corner 1 56.0 8.0 116.5 HE-1 125.5 N 93
09/27/23 19 Left Corner 1 56.0 6.1 113.9 HE-1 125.5 N 91
09/27/23 20 Left Corner 2 56.0 9.1 116.1 HE-1 125.5 N 93
09/27/23 21 Middle of entrance 2 59.0 9.1 115.9 HE-1 125.5 N 92
10/04/23 22 East side by entrance 57.0 9.7 119.4 HE-1 125.5 N 95
10/04/24 23 East side by entrance 57.0 10.4 120.9 HE-1 125.5 N 96
10/04/25 24 East side by entrance 58.0 7.7 116.8 HE-1 125.5 N 93
10/18/23 25 North near entrance 56.0 10.0 122.1 HE-1 125.5 N 97
10/18/24 26 South near entrance 56.0 11.0 120.9 HE-1 125.5 N 96
12/11/23 27 Unit 6 6 54.0 8.6 124.4 HE-1 125.5 N 99
12/11/24 28 Unit 6 6 55.0 8.5 124.1 HE-1 125.5 N 98
12/11/25 29 Unit 5 5 55.0 8.6 123.1 HE-1 125.5 N 98
12/11/26 30 Unit 7 7 54.0 9.7 121.8 HE-1 125.5 N 97
12/11/27 31 Unit 8 8 55.0 10.6 122.1 HE-1 125.5 N 97
12/11/28 32 Unit 9 9 55.0 9.9 124.0 HE-1 125.5 N 98
12/13/23 33 Rear of property 54.0 9.1 123.9 I-1 126.0 N 98
12/13/24 34 Rear of property 55.0 8.0 119.9 I-1 126.0 N 95
12/13/25 35 Rear of property 54.0 10.3 121.8 I-1 126.0 N 96
12/13/26 36 Rear of property 55.0 10.1 121.8 I-1 126.0 N 97
12/13/27 37 Rear of property 56.0 9.3 113.1 I-1 126.0 N 90
12/13/28 38 Rear of property 57.0 9.1 118.7 I-1 126.0 N 94
12/13/29 39 Rear of property 57.0 9.9 119.8 I-1 126.0 N 95
01/12/24 40 Unit 4 4 SG 8.9 123.4 I-2 131.0 N 94
01/12/24 41 Unit 5 5 SG 9.4 124.2 I-2 131.0 N 95
01/12/24 42 Unit 6 6 SG 10.2 123.1 I-2 131.0 N 94
01/18/24 43 Unit 1 1 SG 8.9 123.4 I-2 131.0 N 94
01/18/24 44 Unit 2 2 SG 9.4 124.2 I-2 131.0 N 95
01/18/24 45 Unit 4 4 SG 10.2 121.1 I-2 131.0 N 92
01/18/24 46 Unit 7 7 SG 9.2 124.1 I-2 131.0 N 95
01/18/24 47 Unit 10 10 SG 8.8 121.5 I-2 131.0 N 93
01/18/24 48 Unit 12 12 SG 10.1 123.1 I-2 131.0 N 94
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Grading
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
NAME IN CAPS ITALICS.
Job Name
Location, CA
GeoTek, Inc.
Wall Backfill 1/29/2024
Project No.: 3 -SD
DATE Test
No.Location Lot
No.
Sta
No.
Elev/
Depth
Moisture
Content
(%)
Dry
Density
(pcf)
Soil
Type
Maximum
Density
(pcf)
Test
Type
Relative
Compaction
(%)
12/05/23 1 Southeast corner -1' 11.5 116.8 HE-1 125.5 N 93
12/05/23 2 East middle -1' 5.0 117.7 HE-1 125.5 N 94
12/07/23 3 North Wall -1' 8.3 113.5 HE-1 125.5 N 90
12/07/23 4 North Wall -1 7.8 119.2 HE-1 125.5 N 95
12/07/23 5 South Wall 1' 7.8 117.3 HE-1 125.5 N 94
12/07/23 6 South Wall -1' 7.8 118.8 HE-1 125.5 N 95
12/07/23 7 East Wall -1' 9.2 117.9 HE-1 125.5 N 94
12/11/23 8 North Wall -1' 9.4 113.8 HE-1 125.5 N 91
12/11/23 9 North wall -1' 8.4 118.4 HE-1 125.5 N 94
12/11/23 10 South Wall -1.5' 9.2 112.9 HE-1 125.5 N 90
01/09/24 11 East Wall -4 7.9 120.2 I-1 131.0 N 91
01/09/24 12 East Wall -2 10.4 117.8 I-1 131.0 N 90
01/09/24 13 East Wall -4 8.1 119.8 I-1 131.0 N 91
01/09/24 14 East Wall -3 10.2 118.9 I-1 131.0 N 91
01/09/24 15 East Wall -1 11.2 118.3 I-1 131.0 N 90
01/09/24 16 East Wall -3 10.8 122.1 I-1 131.0 N 93
01/09/24 17 East Wall -1 11.3 118.5 I-1 131.0 N 90
01/10/24 18 East wall SG 10.3 119.8 I-1 131.0 N 91
01/10/24 19 East wall SG 11.2 118.3 I-1 131.0 N 90
01/10/24 20 East wall SG 10.5 120.1 I-1 131.0 N 92
01/11/24 21 East wall SG 10.0 122.8 I-1 131.0 N 94
01/11/24 22 East wall SG 11.2 124.3 I-1 131.0 N 95
01/11/24 23 East wall SG 10.1 123.1 I-1 131.0 N 94
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Wall Backfill
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate