HomeMy WebLinkAboutMS 2017-0003; CAZADERO DRIVE CONDOMINIUMS; FINAL SOILS REPORT; 2023-07-24
GEOTECHNICAL | ENVIRONMENTAL | MATERIAL
July 6, 2023
Revised July 24, 2023
Project No. 3856-SD
Cypress View Builders
401 B Street, Suite 2400
San Diego, California 92101
Attention: Mr. Ron Hiebert
Subject: Final Soils Report of Geotechnical Observation and Testing
2812 & 2814 Cazadero Drive
Carlsbad, California
Dear Mr. Hiebert:
We are pleased to present herein the results of our geotechnical observations and testing
services during rough, precise, and post-grading construction associated with the subject
project. This revised version of the report incorporates the City inspectors request to provide
a plot plan of compaction tests for post grading, rough grading and a revised subject title.
Rough and precise grading of the subject was completed under the observation of Hetherington
Engineering, Inc. (Hetherington, 2019 and 2021). Post grading occurred between November 1,
2022 to June 6, 2023. 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 for
the site (Hetherington, 2018a and 2018b), geotechnical recommendations presented during
construction, applicable provisions of the 2016 California Building Code (CBC) and City of
Carlsbad guidelines. The subject site is geotechnically suitable for its designed use.
Post-grading construction observation and testing included excavations for the residential
buildings and retaining wall foundations, retaining wall backfill, sidewalk, driveway, and driveway
approach subgrade. Offsite improvements consisted of trench backfill for water, sewer, and gas
utility tie-ins, as well as structural pavement patchback and overlay (subgrade, aggregate base,
and asphalt) along Cazadero Drive.
This report provides a brief summary of site conditions observed during post grading
construction for the subject site and offsite work. Also provided herein are field density and
moisture content test results (compaction) and laboratory analysis.
GeoTek, Inc.
1384 Poinsettia Avenue, Suite A Vista, CA 92081-8505
(760) 599-0509 Off, (760) 599-0593 Fa. www.geotekusa.com
Cypress View Properties, Inc. July 24, 2023
Geotechnical Final Soil Report Project No. 3856-SD
2812 & 2814 Cazadero, Carlsbad, California Page 2
1. SUMMARY OF GEOLOGIC AND SOILS CONDITIONS
1.1. ROUGH AND PRECISE GRADING
Rough and precise grading observation and testing was performed under the
observation and testing of Hetherington Engineering, Inc. A copy of their reports are
provided herein as Attachment A. At the request of the City inspector, Hetherington’s
geotechnical observations have been transferred onto GeoTek’s Figure 1.
1.2. POST GRADING:
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. Laboratory results were
supplied by a GeoTek laboratory or a product’s manufacturing supplier.
Trench backfills for the sewer, natural gas, and water lines were placed and compacted
to at least 90% of the maximum dry density, at or slightly above optimum moisture
content relative to ASTM D 1557.
Subgrade for the driveway approach, which includes monolithically poured curb and
gutter improvements was compacted to at least 95% of the maximum dry density, near
or slightly above optimum moisture content relative to ASTM D 1557.
Subgrade for sidewalk and driveway improvements were compacted to at least 90% of
the maximum dry density, near or slightly above optimum moisture content relative to
ASTM D 1557.
The upper foot (approximately) of subgrade for the offsite street improvements (utilities
trenches) along Cazadero Drive associated with the project were compacted to at least
95% with above optimum moisture content relative to ASTM D 1557.
Aggregate base for the offsite street improvements (utilities trenches) along Cazadero
Drive associated with the project were compacted to at least 95% and at or slightly
above optimum moisture content relative to ASTM D 1557.
Asphalt-concrete (AC) for the offsite street improvements (utilities trenches and
overlay) along Cazadero Drive associated with the project were compacted to at least
95% relative to ASTM D 2041.
GEOTEK
Cypress View Properties, Inc. July 24, 2023
Geotechnical Final Soil Report Project No. 3856-SD
2812 & 2814 Cazadero, Carlsbad, California Page 3
2. FIELD AND LABORATORY TESTING
2.1 FIELD TESTING
Field density tests were taken at periodic intervals and random locations to check the
compaction efforts by the grading and wall contractors. The field density testing for the subject
site was performed using a nuclear gauge, in general accordance with testing procedure ASTM
D 6938 for soils and ASTM D 2950 for asphalt concrete. The results of the field density testing
conducted for the herein reported site area are included in Tables 1 through 6.
2.2 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 laboratory maximum
density for asphalt was provided by the material facility. The table below presents the soil
types used for this project.
2.3 CONCLUSIONS
Field density tests indicate that the fill materials were compacted to the project specifications at
the time and locations tested. Where compaction tests showed a value less than project
minimums relative to the laboratory standard, the area was subjected to additional work and
SUMMARY OF LABORATORY MAXIMUM DRY DENSITY
AND OPTIMUM MOISTURE CONTENT TEST RESULTS
(ASTM D 1557/2041)
Soil Type Description Total Density
(pcf)
Maximum Dry
Density (pcf)
Optimum
Moisture
Content (%)
A Light Olive Brown Silty Clayey
Sand
- 119.0 12.0
B Class II Crushed Miscellaneous
Base
- 114.9
9
13.0
C Class II Crushed Miscellaneous
Base
- 122.0 12.0
HE-2 Crushed Miscellaneous Base - 127.0 10.0
AC-1 Asphalt - Plant Provided 145.5 - -
AC-2 Asphalt - Plant Provided 146.1 - -
GEOTEK
Cypress View Properties, Inc. July 24, 2023
Geotechnical Final Soil Report Project No. 3856-SD
2812 & 2814 Cazadero, Carlsbad, California Page 4
retested to verify minimum project compaction specifications were achieved. It is our
professional opinion that the subject project is suitable from a geotechnical standpoint.
3 LIMITATIONS
The purpose of this report is to present a summary of observation and testing services
provided by this firm during the post-grading operations that were performed on the subject
property between November 1, 2022 to June 6, 2023. More specifically, the scope of this
report includes a presentation of data obtained during rough and post-grading and a discussion
of operations performed by the contractors.
Preparation for, and placement of, compacted fill was monitored by representatives of this firm.
All soils and asphalt tested were found to meet or exceed the minimum degree of compaction
specified in the job requirements. Field density tests were performed at random locations
throughout the area of the job that is within the scope of this report. Our observations and
testing were performed in such a manner as to be reasonably certain that the soils and asphalt
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.
It should be understood that field data, including density test locations and elevations, as well as
the location of compacted fill, are only approximately noted. The accuracy of our field
technician's estimated locations will vary depending on the survey control available at the time
the estimations were made.
This report is subject to review and approval by the controlling authorities for this project.
GeoTek accepts neither responsibility nor liability for work, testing, or recommendations
performed or provided by others.
GEOTEK
Cypress View Properties, Inc. July 24, 2023
Geotechnical Final Soil Report Project No. 3856-SD
2812 & 2814 Cazadero, Carlsbad, California Page 5
We appreciate the opportunity to be of service on this project. Please contact the undersigned
if you have any questions.
Respectfully submitted,
GeoTek, Inc.
Christopher D. Livesey Edwin R. Cunningham
CEG 2733, Exp. 05/31/25 RCE 81687, Exp. 3/31/24
Vice President Project Engineer
Enclosures: Figure 1 – Field Density Test Location Map
Table 1 – Summary of Sewer Field Density Tests
Table 2 – Summary of Water Field Density Tests
Table 3 – Summary of Subgrade Field Density Tests
Table 4 – Summary of Aggregate Base Field Density Tests
Table 5 – Summary of Asphalt Field Density Tests
Attachments: Attachment A – As-Graded Geotechnical Report, Hetherington Engineering, Inc.
Attachment B – Update As-Graded Geotechnical Report, Hetherington Engineering, Inc.
Distribution: (1) Addressee
GEOTEK
Cypress View Properties, Inc. July 24, 2023
Geotechnical Final Soil Report Project No. 3856-SD
2812 & 2814 Cazadero, Carlsbad, California Page 6
REFERENCES
Hetherington Engineering, Inc., 2018a, “Geotechnical Investigation, Proposed Residential
Duplex, Lot 357, La Costa Meadows Unit No. 2, Cazadero Drive, Carlsbad,
California,” Project No. 8479.1, Log No. 19987, dated July 31, 2018.
_____, 2018b, “Grading Plan Review/Response to City Review Comments, Proposed
Residential Duplex, Cazadero Drive, Carlsbad, California,” Project No. 8479.1, Log No.
20177, dated November 26, 2018.
_____, 2019, “As-Graded Geotechnical Report, Residential Duplex, 2812 – 2814 Cazadero
Drive, Carlsbad, California,” Project No. 8479.2, Log No. 20795, dated December 16,
2019.
_____, 2021, “Updated As-Graded Geotechnical Report, Residential Duplex, 2812 – 2814
Cazadero Drive, Carlsbad, California,” Project No. 8479.2, Log No. 21379, dated April
8, 2021.
Christiansen Engineering & Surveying, 2021, “Grading Plans for Cazadero Drive Condo Project,
Carlsbad CA 92009” Sheets 1 through 7, Grading Drawing No. 513-5A, JN 208512
Approved date of August 6, 2019.
GEOTEK
Figure 1
Field Density Test
Location Map
Rincon Homes
2812 & 2814 Cazadero
Carlsbad, California
GeoTek Project No. 3856-SD
RW-1
RW-2
RW-3
SS-1
SS-2
SS-3
SS-4
W-1
W-2
W-3
W-4
SG-1
SG-2
SG-3
SG-4
SG-5
SG-6
SG-7
SG-9
SG-8
SG-10
SG-11
SG-12
SG-13
SG-14
AB-1
AB-2
AB-3
AB-4
AB-5
AB-6
AB-7
AB-8
AC-1
AC-2
AC-3
AC-4
AC-6
AC-5
AC-7
AC-8
AC-9
AC-10
AC-11
AC-12
LEGEND
APPROXIMATE LOCATION OF ENGINEERED FILL TEST
APPROXIMATE LOCATION OF RETAINING WALL TEST
APPROXIMATE LOCATION OF SEWER TEST
APPROXIMATE LOCATION OF WATER TEST
APPROXIMATE LOCATION OF SUBGRADE TEST
APPROXIMATE LOCATION OF AGGREGATE BASE TEST
APPROXIMATE LOCATION OF ASPHALT TEST
29
29
28
27
2625
24
23
22
21
20
19
18
17
16 15
14
13
12
11
10
9
8
7 6
5
4
3
2
1
RW-3
SS-4
W-4
SG-13
AB-8
AC-12
0
D
D
I D 0 I SCALE: 1" = 10'
"' D
D
GEOTEK
CYPRESS VIEW BUILDERS
2812 2814 Cazadero Drive
Carlsbad, CA
GeoTek, Inc.
Sewer 7/6/2023
Project No.: 3856-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
(%)
3/6/23 1 2812 Cazadero Dr. - in front -2' 13.4 113.8 A 119.0 N 96
2 2812 Cazadero Dr. - in front -1' 12.8 114.5 A 119.0 N 96
3 2812 Cazadero Dr. - in front SG 14.2 113.6 A 119.0 N 95
4 2812 Cazadero Dr. - in front SG 12.9 115.2 A 119.0 N 97
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Sewer
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
CYPRESS VIEW BUILDERS
2812 2814 Cazadero Drive
Carlsbad, CA
GeoTek, Inc.
Water 7/6/2023
Project No.: 3856-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
(%)
2/15/23 1 2812 Cazadero Dr. - in front -2' 11.3 117.2 A 119.0 N 98
2 2812 Cazadero Dr. - in front -1' 10.9 116.9 A 119.0 N 98
3 2812 Cazadero Dr. - in front SG 12.5 116.4 A 119.0 N 98
4 2812 Cazadero Dr. - in front SG 12.1 118.6 A 119.0 N 99
TABLE 2
SUMMARY OF FIELD DENSITY TESTS
Water
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
CYPRESS VIEW BUILDERS
2812 2814 Cazadero Dr
Carlsbad, CA
GeoTek, Inc.
Subgrade 7/6/2023
Project No.: 3856-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
(%)
5/10/23 1 Southbound Trench to East Prop.SG 10.2 126.5 HE-2 127.0 N 99
2 Southbound Trench to East Prop.SG 9.2 121.2 HE-2 127.0 N 95
3 Southbound Trench to East Prop.SG 9.4 124.2 HE-2 127.0 N 98
5/11/23 4 Northbound adj to East Prop.SG 11.2 122.5 HE-2 127.0 N 96
5 Northbound adj to East Prop.SG 10.2 121.4 HE-2 127.0 N 96
6 Northbound adj to East Prop.SG 12.1 123.8 HE-2 127.0 N 97
5/12/23 7 Northbound adj to West Prop.SG 12.4 125.5 HE-2 127.0 N 99
8 Northbound adj to West Prop.SG 11.8 126.4 HE-2 127.0 N 99
9 Northbound adj to West Prop.SG 12.6 123.8 HE-2 127.0 N 97
5/16/23 10 Sidewalk Northbound SG 14.3 116.3 HE-2 127.0 N 92
11 Sidewalk Northbound SG 13.4 115.7 HE-2 127.0 N 91
12 Sidewalk Northbound SG 15.5 119.3 HE-2 127.0 N 94
6/6/23 13 2812 Cazadro Driveway SG 16.8 110.8 A 119.0 N 93
14 2814 Cazadro Driveway SG 13.1 115.7 A 119.0 N 97
TABLE 3
SUMMARY OF FIELD DENSITY TESTS
Subgrade
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
CYPRESS VIEW BUILDERS
2812 2814 Cazadero Dr
Carlsbad, CA
GeoTek, Inc.
Base 7/6/2023
Project No.: 3856-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
(%)
5/4/23 1 Driveway in Front of 2812 Base 14.2 109.0 B 114.9 N 95
2 Driveway in Front of 2814 Base 12.0 109.7 B 114.9 N 95
5/10/23 3 Southbound Trench to East Prop.Base 10.8 117.2 C 122.0 N 96
4 Southbound Trench to East Prop.Base 10.1 116.9 C 122.0 N 96
5 Southbound Trench to East Prop.Base 9.8 118.1 C 122.0 N 97
5/11/23 6 Northbound adj to East Prop.Base 10.8 117.6 C 122.0 N 96
7 Northbound adj to East Prop.Base 10.1 116.8 C 122.0 N 96
8 Northbound adj to East Prop.Base 9.8 117.8 C 122.0 N 97
TABLE 4
SUMMARY OF FIELD DENSITY TESTS
Base
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
CYPRESS VIEW BUILDERS
2812 2814 Cazadero Dr
Carlsbad, CA
GeoTek, Inc.
Asphalt 7/6/2023
Project No.: 3856-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
(%)
5/10/23 1 Southbound Trench to East Prop.AC - 142.8 AC 145.6 N 98
2 Southbound Trench to East Prop.AC - 140.2 AC 145.6 N 96
3 Southbound Trench to East Prop.AC - 141.7 AC 145.6 N 97
5/11/23 4 Northbound adj to East Prop.AC - 142.8 AC 145.6 N 98
5 Northbound adj to East Prop.AC - 140.9 AC 145.6 N 97
6 Northbound adj to East Prop.AC - 141.7 AC 145.6 N 97
5/12/23 7 Northbound adj to West Prop.AC - 141.9 AC-2 146.1 N 97
8 Northbound adj to West Prop.AC - 142.1 AC-2 146.1 N 97
9 2812 & 2814 in Front of Prop.AC - 143.5 AC-2 146.1 N 98
10 2812 & 2814 in Front of Prop.AC - 145.8 AC-2 146.1 N 99
11 2812 & 2814 in Front of Prop.AC - 142.8 AC-2 146.1 N 98
12 2812 & 2814 in Front of Prop.AC - 140.9 AC-2 146.1 N 96
TABLE 5
SUMMARY OF FIELD DENSITY TESTS
Asphalt
Note:
N = Nuclear Guage Test
FG = Finished Grade Test
All elevations are approximate
Cypress View Properties, Inc. July 24, 2023
Geotechnical Final Soil Report Project No. 3856-SD
2812 & 2814 Cazadero, Carlsbad, California
APPENDIX A
As-Graded Geotechnical Report
Hetherington Engineering, Inc.
2019
GEOTEK
AS-GRADED GEOTECHNICAL REPORT
Proposed Residential Duplex
2812 -2814 Cazadero Drive
Carlsbad, California
HETHERINGTON ENGINEERING, INC.
HETHERINGTON ENGINEERING, INC.
SOIL & FOUNDATION ENGINEERING • ENGINEERING GEOLOGY • HYDROGEOLOGY
Cypress View Properties, Inc.
401 B Street, Suite 2400
San Diego, California 92101
Attention:
Subject:
Mr. Larry Figueroa
AS-GRADED GEOTECHNICAL REPORT
Proposed Residential Duplex
2812 -281 4 Cazadero Drive
Carlsbad, California
References: Attached
Dear .tv1r. Figueroa:
December 16, 2019
Project No. 8479.2
Log No. 20795
In accordance with your request, we have performed geotechnical services in conjunction
with grading at the subject site. Our services consisted generally of the following:
o Observation and density testing during grading.
o Laboratory testing.
o Engineering and geologic analyses.
0 The preparntion of this repo1i, which presents the results of our testing and
observations, and our conclusions and reconm1endations.
GRADING OPERATIONS
Grading was performed during the period December 2 thrnugh December 13, 2019.
Grading consisted generally of 3 to 4-feet of removals of loose/soft or disturbed fill down
to approved fill and placement of compacted fill to design site grades. The attached Plot
Plan, Plate No. 1 indicates the approximate limits of grading addressed by this report.
The earthwork was performed by Mike Lloyd Excavation Company utilizing grading
plans prepaJed by Christensen Engineering & Surveying.
5365 Avenida Encinas, Su ite A• Carlsbad, CA 92008-4369 • (760) 931-1917 • Fax (760) 931-0545
333 Third Street, Suite 2 • Laguna Beach, CA 92651-2306 • (949) 715-5440 • Fax (760) 931-0545
www. hetheringtonengi nee ring. com
AS-GRADED GEOTECHNICAL REPORT
Project No. 8479.2
Log No. 20795
December 16, 2019
Page 2
SITE PREPARATION
Prior to grading, the site was cleared of existing smface obstructions, vegetation and
debris. Within the areas of proposed construction, existing loose/soft or distmbed fill
was removed down to approved fill. Following removals, the exposed soils were
scarified to a depth of 6 to 8-inches, brought to near optimum moisture conditions and
compacted to at least 90-percent relative compaction as determined by ASTM: D 1557.
SOIL TYPES
The soils utilized as fill consisted of on-site and import soils. The on-site soil was
composed generally of mottled green, tan, and light brown silty sand and green, gray, and
brown sandy clay. Import soil was composed generally of a gray sand with gravel.
FILL PLACEMENT
Fill soils were placed in 6 to 8-inch thick, near horizontal lifts, moisture conditioned to
near optimum moisture content, and compacted to a minimum of 90-percent relative
compaction as determined by ASTM: D 1557. Compaction was achieved by mechanical
means using a Cat D6K track dozer and a Cat 950G rubber tire loader. A water hose was
used for moistme conditioning.
Density tests were performed in accordance with ASTM: D 6938 (Nuclear Method) and
D 1556 (Sand Cone Method). The results of the density tests are presented on the
attached Smmnary of Field Density Tests, Table I. The approximate locations of the field
density tests are indicated on the accompanying Plot Plan, Plate 1. Maximum dry
density/optimum moisture content determinations are presented on the attached Summaiy
of Maximum Dty Density/Optimum Moisture Content Determinations, Table II.
CONCLUSIONS AND RECOMMENDATIONS
Based on our observations and the results of our testing, it is our opinion that the grading
of the site has been performed in general conformance with our recommendations and the
requirements of the city of Carlsbad. The portion of the site addressed by this report is
considered suitable for the intended use. The recommendations for the proposed
construction provided in the "Geoteclmical Investigation ... " (Reference 1) remain
applicable.
HETHERINGTON ENGINEERING, INC.
REFERENCES
1. "Geotechnical Investigation, Proposed Residential Duplex, Lot 357, La Costa
Meadows Unit No. 2, Cazadero Drive, Carlsbad, California", by Hetherington
Engineering, Inc. dated July 31, 2018.
2. "Grading Plan for Cazadero Drive Condo Project, 28 12 -2814 Cazadero Drive,
Carlsbad, CA", by Clu-istensen Engineering & Surveying, undated (Sheets 1
tlu·ough 6).
HETHERINGTON ENGINEERING, INC.
Project No. 8479.2
Log No. 20795
Project No. 8479.2
Log No. 20795
TABLE I
SUMMARY OF FIELD DENSITY TESTS
(ASTM: D 6938 & 1556)
Test No. Test
Date
Soil
Type
Elevation
(feet)
Dry Density
(pcf)
Moisture
Content (%)
Relative
Compaction (%)
1 12/2/19 1 455.3 111.5 15.4 93
2 12/2/19 1 456.4 109.2 17.1 91
3 12/2/19 1 456.3 107.6 17.4 90
4 12/2/19 1 457.5 108.1 16.2 90
5 12/2/19 1 457.6 109.8 17.9 91
6 12/3/19 1 455.0 105.6 16.6 88 (fail)
7 (retest of 6) 12/3/19 1 455.0 110.2 17.3 92
8 12/3/19 1 455.0 108.5 17.9 90
9 12/3/19 1 456.0 105.7 16.0 88 (fail)
10 (retest of 9) 12/3/19 1 456.0 108.9 16.4 91
11 12/3/19 1 456.5 110.1 16.1 92
12 12/11/19 2 458.0 117.2 14.2 92
13 12/11/19 2 457.9 118.8 12.7 93
14 12/12/19 2 458.2 117.3 14.2 92
15 12/12/19 2 458.1 113.7 15.6 90
16 12/13/19 2 458.8 115.7 12.4 91
17 12/13/19 2 458.8 115.7 11.9 91
18 12/13/19 2 458.8 114.8 15.1 90
19 12/13/19 2 458.8 114.1 14.9 90
20 12/13/19 2 458.8 118.1 12.0 93
21 12/13/19 2 458.3 120.1 12.5 95
22 12/13/19 2 458.3 124.6 10.2 98
23 12/13/19 2 458.3 121.9 12.3 96
Project No. 8479.2
Log No. 20795
TABLE II
SUMMARY OF MAXIMUM DRY DENSITY/OPTIMUM MOISTURE CONTENT
DETERMINATIONS
(ASTM: D 1557)
Soil Type Description Maximum Dry
Density (pcf)
Optimum Moisture
Content (%)
1 Gray, green sandy clay 120.0 12.5
2 Gray brown sandy clay with gravel 127.0 10.0
LEGEND
APPROXIMATE LOCATION OF DENSITY TEST
APPROXIMATE REMOVAL BOTTOM ELEVATION (FEET)
1
23
454.5
3
2
4
1
5
7 6
118
9
10
454.5
454.3
454.3
454.3
454.4
454.3
454.6
454.5
454.5
454.4
APPROXIMATE LIMITS OF GRADING
APPROXIMATE LIMITS OF GRADING
BASE MAP: "GRADING PLANS FOR: CAZADERO CONDO PROJECT", SHEET 2 OF 7, CITY OF CARLSBAD, GR 2018-0035, GRADING PLAN SHEET PUD 2017-0003
12
13
15
16
17
18
19
20
14
21
22
23
PLOT PLAN
GEOTECHNICAL CONSULTANTS
HETHERINGTON ENGINEERING,INC.
PROJECT NO.PLATE NO.
012
5 1015200
2812 & 2814 Cazadero DriveCarlsbad, California
8479.2
N
SCALE: 1" = 10'
ll07r NO. 354!
459.STW
457.STF
lLOu NO. 35t4J.
I
I
I
459.BTW
457.BTF
I
I
/
I
I
459.STW
457.STF
•
•
•
[iJ
UNITA
469.3 FF
458.6P
• UNITB
459.3 FF
458.5 P
I --
1
r=•------•
468.8
458
458.STW
456.STF
455.5 FS
l"lEl455.1'
455.7 FS
TC ll':l 455.1'
(!J IFl El 455.2' i "{'
ro 1c a455.75'
R. f.l 455.25'
l'C EL 41:54.6'
I
I
-@
I
STA. 2+ 23.73
INSTALL 1"WATERSERVICE
WITH 3/4" METER
PERVWDW-6
SEE DETAIL "E" ON SHT 7
STA. 2+ 36.73
EXISTING 1" WATER SERVICE
WITH NEW 3/4" METER
PERVWDW-6
• -
)
I 1
Cypress View Properties, Inc. July 24, 2023
Geotechnical Final Soil Report Project No. 3856-SD
2812 & 2814 Cazadero, Carlsbad, California
APPENDIX B
Updated As-Graded Geotechnical Report
Hetherington Engineering, Inc.
2021
GEOTEK
HETHERINGTON ENGINEERING, INC.
SOIL & FOUNDATION ENGINEERING • ENGINEERING GEOLOGY • HYDROGEOLOGY
Cypress View Properties, Inc.
401 B Street, Su ite 2400
San Diego, Califo rnia 92101
Attention: Mr. Ron Hiebert
April 8, 2021
Project No. 8479.2
Log No. 21379
Subj ect: UPDATED AS-GRADED GEOTECHNICAL REPORT
Residential Duplex
2812 -2814 Cazadero Drive
Carlsbad, Cali fornia
References: Attached
Dear Mr. Hiebert:
In accordance with your request, we have performed geotechnical services in conjunction
with the precise grading of building pads, observation of footing excavations, and
observation and testing of plumbing trench backfi ll at the subject site. Our services
during grading and construction consisted generally of the following:
• Observation and testing during grading.
e Observation of footing excavations.
• Observation and density testing of plumbing trench backfi ll.
• Engineering and geologic analyses.
o Preparation of this report, which presents the results of our testing and observations,
and our conclusions and recommendations.
GRADING OPERATIONS
Previous rough grading at the site is summarized in the "As-Graded Geoteclmical
Report ... " (Reference 2) and includes density test numbers l through 23 performed as
part of rough grading.
5365 Avenida Encinas, Suite A • Carlsbad, CA 92008-4369 • (760) 931-1917 • Fax (760) 931-0545
333 Third Street, Suite 2 • Laguna Beach, CA 92651-2306 • (949) 715-5440 • Fax (760) 931 -0545
www. hetheringtoneng ineering .com
UPDATED AS-GRADED GEOTECHNICAL REPORT
Project No. 8479.2
Log No. 21379
April 8, 2021
Page 2
After the initial rougb grading of the site, the upper 1-foot \,vas scarified, moisture
conditioned, and recompactecl to 90-percent relative compaction (ASTM: D l 557) on
February 18, 202 1.
Densit·y tests were performed in accordance witb J\STM: D 6938 (Nuclear Method). The
results of the density tests are presented on the attached Summary of Field Density Tests,
Tabl e I. The approximate locations of the field density tests are indicated on the
accompanying Plot Plan, Figure No . 1. Maximum dry density/optimum moist1-irc content
determinations are presented on the attached Summary of Maximum Dry
Density/Optimum Ivfoistme Content Determinations, Table II.
GEOLOGIC CONDITIONS
Subsurface conditions encotmtered during precise grad ing and construction were
consistent with those described in the "Geoteclmical Investigation ... " (Reference l ) and
"As-Graded Geo technical Report. .. " (Reference 2). No groundwater \,vas encountered
during precise grading and construction.
FOUNDATION EXCAVATIONS
Foundation excavations for the structures were observed by an engineer from th.is office.
Footings were founded in approved compacted fill as recommended and dimensioned in
accordance with the fo undation plans (Reference 4).
PLUMBING TRENCH BACKFILL
Plumbing trench backfill soils were placed in approximately 6 to 8-incb thick, near
horizontal lifts, moisture conditioned to near optimum moisture content and compacted
by mechanical means to a minimum of 90-percent relative compaction as determined by
ASTM: D 1557.
Density tests were performed in accordance with ASTM: D 6938 (Nuclear Method). The
results of the field density tests are presented on the attached Summary of Field Density
Tests, Table I. The approximate locations of the field density tests are indicated on the
accompanying Plot Plan, Figure No. 1. Maximum dry density/optimum moisture content
determinations are presented on the attached Summary of Maximum Dry
Density/Optimum Moisture Content Determinations, Table II.
HETHERINGTON ENGINEERING, INC.
UPDATED AS-GRADED GEOTECHNICAL REPORT
Project No. 8479.2
Log No. 21379
April 8, 2021
Page 4
Attachments: Plot Plan
Summary of Field Density Tests
Summary of Maximum Dry Density/
Optimum Moisture Content Determinations
Pigure 1
Table l
Tabl e JI
Distribution: 1-via e-mail Ron Hiebert (Ron@cypressvievv.com)
HETHERINGTON ENGINEERING, INC.
R.Ef-EREN CES
1. "Geotechnical Investigation, Proposed Residential Duplex, Lot 357, La Cosla
Meadows Unit No. 2, Cazadero Drive, Carlsbad, California", by Hetherington
Engineering, Inc. dated July 31, 2018.
2. "As-Graded Geotcchnica l Report, Proposed Residential Duplex, 28 12 -2814
Cazadero Drive, Lot 357, Carlsbad, California", by .Hetherington Engineering, Inc.
elated December J 6, 201 9.
3. "Grading Plan for Cazadero Drive Condo Project, 2812 -2814 Cazadero Drive,
Carlsbad, CA", by Christensen Engineering & Surveying, undated (Sheets l through
6).
4. "Cazadero Drive Condo Project, Cazadero Drive, Carlsbad, CA 92009", Foundation
Plan, Structmal Specs, and Structural Details, by Prentice Engineering, elated August
20, 2018 (Sheets SSJ, Sl.0, and S3.0).
HETHERINGTON ENGINEERING, INC.
Project No. 8479.2
Log No. 21379
LEGEND
APPROXIMATE LOCATION OF DENSITY TEST29
29
28
25
27
26
24
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PLOT PLAN
GEOTECHNICAL CONSULTANTS
HETHERINGTON ENGINEERING,INC.
PROJECT NO.FIGURE NO.
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8479.2
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TABLE I
SUMMARY OF FIELD DENSITY TESTS
(ASTM: D 6938)
Test No. Test Date Remarks Soil Elevation Dry Density Moisture Relative
Type (feet) (pct) Content Compaction
(%) (Of«,)
24 2/18/2021 G ] 458.5 l 16.5 12.7 92
25 2/1 8/2021 G 1 458.5 12 1.7 11.4 96
26 2/18/2021 G I 458.0 124.2 7.2 98
27 3/23/2021 PT 1 458.0 11 5.7 13.3 91
28 3/23/2021 PT 1 458.5 115.6 8.5 91
29 3/23/2021 PT 1 458.5 11 7.4 10.8 92
G: Precise Grnding
PT: Plumbing trench back Iii I
TABLE II
SUMMARY OF MAXIMUM DRY DENSITY/OPTIMUM MOISTURE CONTENT
DETERMINATIONS
(ASTM: D 1557 A)
Soil Type Description
1 Grav brown sanely clay with gravel
2 Gray green sandy clay
Maximum Dry
Density <ocf)
127.0
120.0
Optimum Moisture
Content (%)
10.0
12.5
Project No. 8479.2
Log No. 213 79