HomeMy WebLinkAboutCUP 91-03C; BP/ARCO FACILITY 5792 PALOMAR AIRPORT ROAD CAR WASH; FINAL SOILS REPORT; 2026-01-16Page 1 of 2
GEOTECHNICAL ENGINEERING CONSTRUCTION INSPECTION MATERIALS TESTING ENVIRONMENTAL
OFFICE LOCATIONS
ORANGE COUNTY CORPORATE BRANCH
2992 E. La Palma Avenue Suite A
Anaheim, CA 92806
Tel: 714.632.2999 Fax: 714.632.2974
SAN DIEGO IMPERIAL COUNTY
6295 Ferris Square Suite C
San Diego, CA 92121
Tel: 858.537.3999 Fax: 858.537.3990
INLAND EMPIRE
14467 Meridian Parkway
Building 2A
Riverside, CA 92518
Tel: 951.653.4999 Fax: 951.653.4666
OC/LA/INLAND EMPIRE
DISPATCH
800.491.2990
SAN DIEGO DISPATCH
888.844.5060
www.mtglinc.com
August 30, 2024
Revised January 16, 2026
MTGL Project No.: 7757A02
Jason Meram MTGL Log No.: 24-0268-R1
Meram Building MTGL Branch: San Diego
8127 La Mesa Boulevard, Suite C Grading Permit No.: GR 2023-0002
La Mesa, CA, 91942
Subject: FINAL SOILS REPORT- ROUGH GRADED BUILDING PAD CERTIFICATION
BP/ARCO Facility 5792 Palomar Airport Road Car Wash
1991 Palomar Airport Road, Carlsbad, California
References: Applied Consultants (2023), Updated Preliminary Geotechnical
Investigation at the Subject Property Located at 1991 Palomar Airport
Road, Carlsbad, CA 92011, dated April 7th, 2023.
Najars Engineering (2024), Grading Plans For BP/ARCO Facility 5792
Palomar Airport Road Car Wash, Grading Permit No. GR 2023-0002,
Project No. CUP91-03C, approved March 1st, 2024
Pursuant to your authorization, and in accordance with the requirements set forth by
the City of Carlsbad, this report for the above referenced site confirms that
earthwork associated with the rough graded building pad was completed in
compliance with the referenced approved grading plans as well as the referenced
geotechnical report requirements for the building pad during the period of August 7,
2024 through August 26, 2024.
In our opinion rough grading for the building pad was performed in general
compliance with the recommendation of the referenced geotechnical report as well
as the City of Carlsbad Grading Ordinance and are suitable for it’s intended use.
MTGL provided geotechnical observation and testing services during site grading
operations for the proposed building pad. Field density testing was performed by the
direct transmission nuclear method, ASTM D6938/D2950. The maximum density –
optimum moisture relationship for the soil was established in the laboratory by the
ASTM D1557 test method. Results of the field-testing indicate that fill materials
within the building pad area were compacted to a minimum of 90% of the laboratory
maximum dry density as determined by test method ASTM D1557. The laboratory
maximum density results are provided in Table 1, “Laboratory Test Results.”
Tabulated results of the field compaction testing performed are provided in Table 2,
Meram Building MTGL Project No. 7757A02
Palomar Airport Road Car Wash MTGL Log No. 24-0268-R1
Carlsbad, California Revised January 16, 2026
Page 2 of 2
“Field Density Test Results”. The approximate locations of each test and extents of remedial
grading are presented in Figure 1.
This report is limited to geotechnical observation and testing services performed by MTGL
during rough grading of the building pad only. Testing and observations performed by others
outside the time period noted above are not included in this report and were not evaluated by
MTGL.
This certification contains a statement of professional opinion based on our field observations
during rough grading, the results of tests performed during rough grading, a review of the
referenced soils engineering reports, and a geotechnical evaluation of the compiled data. Our
tests and observations were made in accordance with commonly accepted procedures
consistent with applicable standards of practice. This report does not constitute a guarantee or
warranty of any type, and none should be inferred. The proposed improvements should be
constructed in accordance with the soil bearing values and recommended geotechnical design
parameters contained within the referenced geotechnical report.
We appreciate this opportunity to be of continued service to you on this project. Should you
have any questions regarding this report, please do not hesitate to contact us at your
convenience.
Respectfully Submitted,
MTGL, Inc.
Isaac Chun, GE
Principal Engineer
Attachments:
Tables 1 and 2 - Laboratory and Field Density Testing Summary
Figure 1- In-Place Density Test Map Figure
Meram Building MTGL Project No.: 7757A02
Palomar Airport Road Car Wash MTGL Log No.: 24-0268
Carlsbad, California August, 2024
TABLE 1 - LABORATORY TEST RESULTS
MAXIMUM DENSITY - OPTIMUM MOISTURE CONTENT
Lab
No.
Sample
Date
Sample
Location
Material
Description
Max Density
(pcf)
Opt Moist
(%)24-7725-S01 8/2/24 Near Proposed Car Wash Building: Stockpile Clayey Sand with Gravel, Medium Brown 128.7 10.124-7963-S01 8/8/24 Car Wash Pad OX: Stockpile Clayey Sand, trace Gravel, Light Brown to Gray 129.2 8.8
Test Method:ASTM D1557 - Maximum Density Optimum Moisture Relationships
Meram Building MTGL Project No.: 7757A02
Palomar Airport Road Car Wash MTGL Log No.: 24-0268
Carlsbad, California August, 2024
TABLE 2 - FIELD DENSITY TEST RESULTS
Test
No.Date Location
Test Elev
or Depth
(ft)
Moist
Content
(%)
Dry
Density
(pcf)Max No.
Rel
Comp
(%)
Req'd
Comp
(%)
Test
Type Remarks
1 8/7/24 Northwest Car Wash Pad Over-Excavation Bottom 196.8'11.2 118.7 24-7785-S01 92 90 NU
2 8/7/24 Northwest Car Wash Pad Over-Excavation Bottom 196.8'11.3 117.7 24-7785-S01 91 90 NU
3 8/7/24 Northwest Car Wash Pad Over-Excavation Bottom 196.8'12.0 118.8 24-7785-S01 92 90 NU
4 8/8/24 Northwest Car Wash Pad Over-Excavation Fill 198.8'12.1 118.6 24-7785-S01 92 90 NU
5 8/8/24 Northwest Car Wash Pad Over-Excavation Fill 198.8'11.4 118.5 24-7785-S01 92 90 NU
6 8/8/24 Northwest Car Wash Pad Over-Excavation Fill 199.0'11.0 117.1 24-7785-S01 91 90 NU
7 8/8/24 Northwest Car Wash Pad Over-Excavation Fill 200.8'11.6 116.5 24-7963-S02 90 90 NU
8 8/8/24 Northwest Car Wash Pad Over-Excavation Fill 200.8'10.5 116.7 24-7963-S02 90 90 NU
9 8/13/24 Northeast/East Car Wash Pad Over-Excavation Bottom 196.0'10.1 115.9 24-7963-S01 90 90 NU
10 8/13/24 Northeast/East Car Wash Pad Over-Excavation Bottom 196.0'11.0 115.8 24-7963-S01 90 90 NU
11 8/13/24 Northeast/East Car Wash Pad Over-Excavation Bottom 196.8'11.1 118.9 24-7963-S01 92 90 NU
12 8/13/24 Northeast/East Car Wash Pad Over-Excavation Bottom 196.8'10.4 118.4 24-7963-S01 92 90 NU
13 8/14/24 Northeast/East Car Wash Pad Over-Excavation Fill 198.8'11.8 117.4 24-7785-S01 91 90 NU
14 8/14/24 Northeast/East Car Wash Pad Over-Excavation Fill 199.1'12.0 118.4 24-7785-S01 92 90 NU
15 8/14/24 Northeast/East Car Wash Pad Over-Excavation Fill 197.3'12.5 116.2 24-7785-S01 90 90 NU
16 8/15/24 Northeast/East Car Wash Pad Over-Excavation Fill 197.8'12.1 119.0 24-7725-S01 92 90 NU
17 8/15/24 Northeast/East Car Wash Pad Over-Excavation Fill 198.8'11.9 119.3 24-7725-S01 93 90 NU
18 8/15/24 Center East Car Wash Pad Over-Excavation Bottom 196.8'14.9 116.1 24-7725-S01 90 90 NU
19 8/15/24 Center East Car Wash Pad Over-Excavation Bottom 196.8'10.5 116.4 24-7963-S01 90 90 NU
20 8/15/24 Northwest Car Wash Pad Over-Excavation Fill 198.8'12.4 118.8 24-7963-S01 92 90 NU
21 8/16/24 Center Car Wash Pad Over-Excavation Fill 198.8'12.0 117.0 24-7725-S01 91 90 NU
22 8/16/24 Center Car Wash Pad Over-Excavation Fill 198.8'13.1 116.7 24-7725-S01 91 90 NU
23 8/16/24 Center Car Wash Pad Over-Excavation Fill 198.8'12.8 119.1 24-7725-S01 93 90 NU
24 8/19/24 Southwest Car Wash Pad Over-Excavation Bottom 196.8'13.1 116.3 24-7725-S01 90 90 NU
25 8/19/24 Southwest Car Wash Pad Over-Excavation Bottom 196.8'12.0 116.3 24-7725-S01 90 90 NU
26 8/19/24 Southwest Car Wash Pad Over-Excavation Fill 198.8'11.8 118.4 24-7725-S01 92 90 NU
27 8/19/24 Southwest Car Wash Pad Over-Excavation Fill 198.8'11.6 115.6 24-7725-S01 90 90 NU
28 8/19/24 Septic Tank Removal Fill 197.0'13.6 116.2 24-7725-S01 90 90 NU
29 8/19/24 Septic Tank Removal Fill 199.0'11.7 117.2 24-7725-S01 91 90 NU
30 8/22/24 North Biofiltration Basin and Carwash Footing Over Excavation Fill 194.5'12.4 116.6 24-7725-S01 91 90 NU
31 8/22/24 North Biofiltration Basin and Carwash Footing Over Excavation Fill 194.5'12.2 116.8 24-7725-S01 91 90 NU
32 8/22/24 North Biofiltration Basin and Carwash Footing Over Excavation Fill 194.5'13.6 115.9 24-7725-S01 90 90 NU
33 8/26/24 Car Wash Equipment Pad Finish Grade 201.2'9.3 117.1 24-7785-S01 91 90 NU
34 8/26/24 Car Wash Pad Finish Grade 200.8'9.6 116.5 24-7785-S01 91 90 NU
35 8/26/24 Car Wash Equipment Pad Finish Grade 201.2'10.0 120.5 24-7785-S01 94 90 NU
36 8/26/24 Car Wash Pad Finish Grade 200.8'9.6 122.5 24-7785-S01 95 90 NU
Meram Building MTGL Project No.: 7757A02
Palomar Airport Road Car Wash MTGL Log No.: 24-0268
Carlsbad, California August, 2024
TABLE 2 - FIELD DENSITY TEST RESULTS
Test
No.Date Location
Test Elev
or Depth
(ft)
Moist
Content
(%)
Dry
Density
(pcf)Max No.
Rel
Comp
(%)
Req'd
Comp
(%)
Test
Type Remarks
37 8/26/24 South Biofiltration Basin and Carwash Footing Over Excavation Bottom 193.5 9.0 115.9 24-7785-S01 90 90 NU
38 8/26/24 South Biofiltration Basin and Carwash Footing Over Excavation Bottom 193.5 9.3 116.2 24-7785-S01 90 90 NU
39 8/26/24 South Biofiltration Basin and Carwash Footing Over Excavation Fill 194.5'9.7 115.8 24-7785-S01 90 90 NU
40 8/26/24 South Biofiltration Basin and Carwash Footing Over Excavation Fill 194.5'9.4 116.0 24-7785-S01 90 90 NU
NU - Nuclear Gauge Test (ASTM D6938 / D2950)
S S S S S S S S S S S S S S S S
E E E E E E E E E E E
SS
SS
SSSSSSSSSSSSSSSSSS
W W W W W W
SSSSSSSSSSSSSSSSSSSSSSSSSSSS
19
0
195
200
205
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
201
2
0
2
20
3
2
0
4
FG=199.63
AREA=956SF
BMP-B
EV
PA
R
K
I
N
G
ON
L
Y
VA
C
U
U
M
VA
N
AC
C
E
S
S
I
B
L
E
NO
PA
R
K
I
N
G
CARWASH (P)
FF=VARIES
PAD=200.78
SEWER MH
RIM=195.35(±)(IE=185.16)
TRASH (E)
10
11
V12
V13
V14
EQUIPMENT (P)
FF=201.87
PAD=201.20
12
14
10
Figure No.
1
As-Graded Map
Palomar Airport Road Car Wash
Carlsbad, California
MTGL Project No.:
7757A02 TC
Date:
August, 2024
Author:
Geotechnical Engineering
Construction Inspection
Materials Testing
Environmental
SCALE (feet)
20'40'0'
Plan Reference: Najars Engineering, Grading Plans For BP/ARCO Facility 5792 Palomar
Airport Road Car Wash, GR 2023-0002, Project No. CUP 91-03C, Approved March 1st 2024.
Note: All locations and elevations are
approximate.
Over-Excavation Bottom
Elevation (feet, MSL)
LEGEND
40 Density Test Location-
Approximate Extents of
Over-Excavation-
-
1
2
3
4 5
67
8
9
10 11
12
13 14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30 31 32
33
34
35
36
38 3740 39
196.0
196.8
196.8 196.8
196.8
196.8
195.0
193.5 193.5 193.5
196.8