HomeMy WebLinkAboutCUP 2017-0009; ECO-FRIENDLY AUTO SPA; FINAL SOILS REPORT; 2023-08-31ALLIBDEARTHTECHNOLOGY
7915 SlLVERTON AVENUE, SUITE 317
SAN DIEGO. CALIFORNIA 92126
TEL: (858) 586-1665 (619) 447-4747
e-mail : ROBERTAEFivAOL.COM
ROBERT CHAN. P.E.
August 31, 2023
Stellar Properties LLC
5030 A venida Encinitas, Suite 290
Carlsbad, CA. 92011
Subject:
Gentlemen:
Project No. 21-1126H4
As-Graded Report of Geotechnical Observation and Soil Testing
Proposed Eco-Friendly Auto Spa Site
6010 A venida Encinas
Carlsbad, California
This report presents the results of our geotechnical observation and testing of fill soils placed
during the development for the proposed Eco-Friendly Auto Spa site on subject property, located
at 6010 A venida Encinas, in the City of Carlsbad, State of California.
The grading reported herein was performed in accordance with the approved grading and
improvement plans and Geotechnical Investigation Report prepared by Construction Testing and
Engineering, Inc. San Dieguito Engineering (CUP 2017-0009), and the recommendations
presented in the Geotechnical Investigation Report prepared by our firm.
Rough Grading
Prior to commencement of grading, the site was cleared and grubbed, and all debris hauled away
and disposed of off-site. Grading commenced in September of 2021, with remedial grading for
the on-site structures, consist of the car wash tunneVoffice building; trash enclose and
vacuum/restroom. In the area of the proposed structures, existing soils within 5 feet outside the
foundation lines were excavated to a minimum depth of 3 feet below the bottom of the proposed
foundation, or to the depth of suitable material, whichever depth is greater. In all structure areas,
the maximum depth of removal was 6 feet. In addition, chunks of clayey soils encountered in the
undocumented fill were removed, and disposed of off-site
The bottom of the over-excavations were inspected and approved by our firm, and then scarified
to a depth of 8 inches. The removed soils were then properly moistened, replaced and uniformly
compacted in lifts on the order of 6 to 8 inches until finished grade is achieved.
Project No. 21-1126H4 Stellar Properties LLC
6010 A venida Encinas
08/31/23 Page 2
In November, 2021, grading for the parking lot was accomplished. The upper 24 inches of the
soils beneath finished grade were removed and uniformly recompacted.
Backfill soils placed over on-site utilities were observed to be properly compacted.
In April, 2023 , the base and asphaltic concrete placed on the driveway entrance were observed and
tested.
The in-situ densities of the fill soils, base material and asphaltic concrete placed were tested in
accordance with the applicable provisions of ASTM D2922. The depths of fill at which the
tests were taken and the final test results are presented on pages T-1 to T-4, under, "Table of Test
Results". The laboratory determinations of the maximum dry densities and optimum moisture
contents of the fill soils, base material and asphaltic concrete are set forth on page L-1 under,
"Laboratory Test Results". The approximate location of the compacted filled ground and field
density tests are shown on Figure No. 1, entitled, "Approximate Location of Compacted Filled
Ground and Field Density Tests".
The results of the tests and observations indicate that the fill soils placed on the site have been
compacted to at least 90 percent of maximum dry density at near optimum moisture content; while
the subgrade soils; base material and asphaltic concrete have been compacted to at least 95 percent
of maximum dry density
Inspection of Foundation Trench Excavations
The foundation trench excavations for all on-site structures were inspected, and these foundation
excavations were detemiined to be into competent natural or compacted fill soils; of such
dimensions as shown on the approved plans, and had been extended to the proper depth and bearing
strata.
Surface Drainage and Mainenance
Proper control of the site drainage and regular maintenance of all drainage facilities are important
factors related to the overall stability of the soil mass. Surface water around the perimeter of the
proposed structures should flow away from the structures at a gradient of 2 percent for a minimum
distance of 5 feet, and drain into the street or into on-site drainage structures without intermediate
ponding.
The geotecbnical conditions encountered during grading did not differ substantially from those
presented in the Geotecbnical Investigation Report for subject property, and all recommendations
presented therein have been substantially complied with. The grading performed have been in
substantially conformance with the approved grading plans.
Project No. 21 -1126H4 Stellar Properties LLC
6010 A venida Encinas
08/31/23 Page 3
Project No. 21-l 126H4 Stellar Properties LLC
6010 A venida Encinas
LABORATORY TEST RESULTS
08/31/23 Page L-1
1. The maximum dry densities and optimum moisture contents of the fill soils encountered
were determined in accordance with A.S.T.M. D1557, Method A. The results of the tests
are presented as follows :
Maximum Optimum
Soil Soil Dry Density Moisture Content
Type Description (lbs./cu.ft.) (% Dry Wt.)
1 Brown clayey fine sand (SC) 120.0 11.5
2 Reddish brown fine sandy clay 122.0 10.5
(CL)
3 Recycled Class II Base 118.0 12.0
4 Class II Base Material 142.0 6,0
5 Asphaltic Concrete 146.0
• Provided by material plant
Project No. 21-1126H4 Stellar Properties LLC
6010 A venida Encinas
08/31/23 Page T-1
TABLE OF TEST RESULTS
=====
Depth Plus
of Fill Field Dry ¾" Maximum Date
Test Soil at Test Moisture Density Rock Dry Density Percent of
No. Type (Ft.) (% Dry Wt.) (lbs./cu.ft.) (%) (lbs./cu.ft.) Compaction Test Remarks
T-1 2 + 2 11.1 111 .3 0 122.0 91.2 09/24/21
T-2 2 +2 12.2 I I I.I 0 122.0 91.1 09/24/21
T-3 2 +2 18.0 112.9 0 122.0 92.5 09/24/21
T-4 +2 10.7 112.8 0 120.0 94.0 09/24/21
T-5 +2 11.6 112.0 0 120.0 93.4 09/24/21
T-6 +4 13.3 108.0 0 120.0 90.5 09/27/21
T-7 +4 12.9 118.7 0 120.0 97.2 09/27/21
T-8 +4 10.1 111.0 0 120.0 92.6 09/27/21
T-9 2 +4 9.9 118.6 0 122.0 97.2 09/27/21
T-10 2 +4 10.8 111.3 0 122.0 91.2 09/27/21
T-11 2 +6 11.5 111.6 0 122.0 91.5 09/30/21 Finished grade
T-12 2 +6 9.8 118.2 0 122.0 96.9 09/30/21
T-13 2 +6 12.0 112.8 0 122.0 92.4 09/30/21
T-1 4 +6 9.6 112.4 0 120.0 93.6 09/30/21
T-15 +6 10.1 113.2 0 120.0 94.3 09/30/21
T-16 +6 10.9 112.2 0 120.0 93.5 09/30/21
T-17 +2 14.1 108.8 0 120.0 90.7 0930/21
T-18 +2 10.6 111.1 0 120.0 92.6 09/30/21
T-19 +4 11.7 108.0 0 120.0 90.0 09/30/21
T-20 +4 11.8 111.6 0 120.0 93.0 10/01 /21
T-21 +3 10.6 114.9 0 120.0 95.7 I 0/01/2 1
Project No. 21-1126H4 Stellar Properties LLC
6010 A venida Encinas
08/31/23 Page T-2
TABLE OF TEST RES UL TS (Cont'nd)
== ======
Depth Plus
of Fill Field Dry ¾" Maximum Date
Test Soil at Test Moisture Density Rock Dry Density Percent of
No. Type (Ft.) (% Dry Wt.) (lbs./cu.ft.) (%) (lbs./cu.ft.) Compaction Test Remarks
T-22 +3 10.0 115.2 0 120.0 96.0 l 0/01 /21
T-23 +6 13.2 116.4 0 120.0 97.0 10/01/21 Finished Grade
T-24 +6 13.2 I 15.4 0 120.0 96.2 10/01/21
T-25 +6 14.1 110.0 0 120.0 91.7 10/01 /21
T-26 +6 12 .9 110.8 0 120.0 92.3 10/01 /21
T-27 + 1 12,5 111 ,8 0 120.0 93.1 11 /04/21
T-28 + 1 11.3 117.5 0 120.0 97.9 11 /04/21
T-29 +2 11.5 114.0 0 120.0 95.0 11 /05/21 Subgrade
T-30 +2 10.0 114.2 0 120.0 95.1 I 1/05/21
T-31 + I 13.4 111.6 0 120.0 93.0 11/05/21
T-32 + 1 11.5 109.4 0 120.0 91.1 11/05/21
T-33 + 1 10.6 112.9 0 120.0 94.1 11/05/21
T-34 + 1 8.5 108.0 0 120.0 90.0 07/1 5/22 Water lateral backfill
T-35 + 1 8.5 108.5 0 120.0 90.4 07/15/22
T-36 + 1 7.8 116.3 0 120.0 96.9 01/25/23 Curb
T-37 + 1 I 1.0 I 12.2 0 120.0 93.5 01/25/23 "
T-38 + 1 12.0 111.2 0 120.0 92.7 01/25/23
T-39 + 1 11.5 113.7 0 120.0 94.7 01/25/23
T-40 + 1 12.0 115.6 0 120.0 96.5 01/25/23
T-41 + 1 9.9 115.8 0 120.0 96.5 01/25/23
T-42 + 1 10.7 118.7 0 120.0 98.9 01/25/23
T-43 + I 8.9 119.5 0 120.0 99.6 01/25/23
T-44 + I 8.7 1 I 9.1 0 120.0 99.3 01/25/23
Project No. 21-1126H4 Stellar Properties LLC
601 0 A venida Encinas
08/31 /23 Page T-3
TABLE OF TEST RES UL TS (Cont'nd)
------------------
Depth Plus
of Fill Field Dry ¾" Maximum Date
Test Soil at Test Moisture Density Rock Dry Density Percent of
No. Type (Ft.) (% Dry Wt.) (lbs./cu.ft.) (%) (lbs./cu.ft.) Compaction Test Remarks
T-45 + 1 13 .5 114.9 0 120.0 95.8 04/06/23 Subgrade
T-46 + 1 15.1 114.5 0 120.0 95.4 04/06/23
T-47 + 1 16.1 115 .0 0 120.0 95.8 04/06/23
T-48 + l 13.6 l 14.8 0 120.0 95 .7 04/06/23
T-49 + 1 13.6 114.6 0 120.0 95.5 04/06/23
T-50 + 1 8.7 113 .6 0 120.0 95.7 04/20/23 Sidewalk
T-51 + l 10.1 112.0 0 120.0 93.4 04/20/23
T-52 + 1 7.8 111.0 0 120.0 92.5 04/20/23
T-53 + 1 8.8 115.7 0 120.0 96.4 04/20/23
T-54 +l 8.9 116.4 0 120.0 97.0 04/20/23
T-55 + l 7.1 110.0 0 120.0 91.7 04/20/23
T-56 + l 10.3 119.2 0 120.0 99.3 04/20/23
T-57 + 1 10.0 115.0 0 120.0 95.8 04/20/23
T-58 + 1 8.6 111.4 0 120.0 92.9 04/20/23
T-59 + 1 10.0 116.1 0 120.0 96.8 04/20/23 "
B-1 3 + 1 10.1 112.5 0 118.0 95.3 04/04/23 Base
B-2 3 + 1 10.3 113.0 0 118.0 95.8 04/04/23
B-3 3 + 1 10.9 112.5 0 118.0 95.3 04/07/23
B-4 3 + 1 10.0 112.2 0 118.0 95.1 04/07/23
B-5 3 + 1 11.1 114.7 0 118.0 97.2 04/07/23
B-6 3 + 1 9.9 112.6 0 118.0 95.6 04/07/23
B-7 4 + l 5.0 136.7 0 142.0 95.9 07/20/23
B-8 4 + 1 5.8 141.6 0 142.0 99.7 07/20/23
Project No. 21-1126H4 Stellar Properties LLC
6010 Avenida Encinas
08/31/23
TABLE OF TEST RESULTS (Cont'nd)
== ======
Depth Plus
of Fill Field Dry ¾" Maximum Date
Test Soil at Test Moisture Density Rock Dry Density Percent of
No. Type (Ft.) (% Dry Wt.) (lbs./cu.ft.) (%) (lbs./cu.ft.) Compaction Test Remarks
B-9 4 + 1 3.9 137.0 0 142,0 96.5 07/20/23 Base
AC-1 5 + 1 138.7 0 146.0 95 .1 04/07/23 A.C.
AC-2 5 + 1 138.9 0 146.0 95.l 04/07/23
AC-3 5 + 1 139.1 0 146.0 95.2 04/07/23
AC-4 5 + 1 141.0 0 146,0 96.5 04/07/23
AC-5 5 +I 144.4 0 146.0 98.7 04/07/23
AC-6 5 + 1 142.6 0 146.0 97.7 04/07/23
AC-7 5 + 1 140.2 0 146,0 95 .9 04/07/23
AC-8 5 + 1 143,5 0 146.0 98.2 04/07/23
AC-9 5 + 1 139.4 0 146.0 95.5 04/07/23
AC-10 5 + 1 139.l 0 146.0 95.3 04/07/23 "
AC-11 5 + 1 139.9 0 146,0 95.8 04.07/23
AC-12 5 + 1 139.6 0 146.0 95.6 04/07/23
Page T-4
... __ --------------
LEGEND
~jJ APPROXIMATE LOCATION OF
COMPACTED FILL GROUND
T # 1 APPROXIMATE LOCATION OF
@ FIELD DENSITY TEST ON DIRT
8# 1 APPROXIMATE LOCATION OF
(I) FIELD DENSITY TEST ON BASE
AC# 1 APPROXIMATE LOCATION OF
FIELD DENSITY TEST ON AC
APPROXIMATE LOCATION OF
COMPACTED FILL GROUND AND
FIELD DENSITY TESTS
PROJECT NO 23-1126 H4
AC#8
I _________________________________ J
FIGURE N0.l