BRES2019-0330 Soil Report 9/6/2022
BRES2019-0330 – NORTH
BUILDING / 51480 DESERT
CLUB DR
8,319SF MULTI-FAMILY
8-UNIT APARTMENT
BUILDING WITH 1,855SF
GARAGE [VB/R-2 + S-1
OCC/40-OL/ CLASS
A-FR/13R SPRINKLER
SYSTEM] THIS PERMIT
DOES NOT INCLUDE SITE
LIGHTING, TRASH
ENCLOSURE, CARPORTS
OR SIGNAGE. 2016
CALIFORNIA BUILDING
CODES.
BRES2019-0303 – SOUTH
BUILDING / 51520 DESERT
CLUB DR
8,319SF MULTI-FAMILY
8-UNIT APARTMENT
BUILDING WITH 1,855SF
GARAGE [VB/R-2 + S-1
OCC/40-OL/ CLASS
A-FR/13R SPRINKLER
SYSTEM] THIS PERMIT
DOES NOT INCLUDE SITE
LIGHTING, TRASH
ENCLOSURE, CARPORTS
OR SIGNAGE. 2016
CALIFORNIA BUILDING
CODES.
45090 Golf Center Parkway, Suite F, Indio, CA. 92201 (760) 863-0713 Fax (760) 863-0847
6782 Stanton Avenue, Suite C, Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369
450 Egan Avenue, Beaumont, CA 92223 (951) 845-7743 Fax (951) 845-8863
www.Sladdenengineering.com
January 12, 2023 Project No. 522-19186
23-01-025
Paul Marcinkowski
Desert Club, LLC
74825 Fair Drive
Palm Desert, California 92260
Project: Building A - Desert Club Apartments
51-480 Desert Club Drive
La Quinta, California
Subject: Report of Observations and Testing Performed During Grading
Ref: Geotechnical Update prepared by Sladden Engineering dated November 18, 2022;
Project No. 544-19186, Report No. 22-11-685
Summarized in this report are the results of in -place density tests performed at the .subject site
during building pad grading along with pertinent observations. The project site is located at
51480 Desert Club Drive in the City of La Quinta, California.
The building pad grading included over -excavation and re -compaction of the surface soil
throughout the building areas. All artificial fill and native low density near surface soil was
removed to a depth of at least 4 feet below existing grade or 4 feet below the bottom of the
footings, whichever was deeper. Remedial grading extended laterally, a minimum of five feet
beyond the building perimeter. The soil exposed by over -excavation was scarified, moisture
conditioned to near optimum moisture content, and compacted to at least 90 percent relative
compaction. The previously removed soil was then placed in thin lifts at near optimum moisture
content and compacted to at least 90 percent relative compaction.
Field testing was performed from December 22, 2022 through January 3, 2023. Testing indicates
that a minimum of 90 percent relative compaction was attained in the areas tested. The passing
test results indicate compliance with the project specifications at the tested locations and depths
but are no guarantee or warranty of the contractor's work.
Field Tests: In -place moisture/density tests were performed using a nuclear density gauge in
accordance with Test Methods ASTM D 6938-08. A total of 15 density tests were performed. Test
results are summarized on the attached data sheet. The approximate test locations are indicated
on the attached plan.
S'ladden Engineering
January 12, 2023 -2- Project No. 522-19186
23-01-025
Laboratory Tests: The moisture -density relationships for the tested materials were determined in
the laboratory in accordance with ASTM Test Method D 1557-91. Laboratory test results are
attached.
Conventional shallow spread footings are expected to provide adequate support for the proposed
apartment building. All footings should have a minimum embedment depth of 12 inches
measured from the lowest adjacent finished grade. Continuous and isolated footings should have
minimum widths of 12 inches and 24 inches, respectively. Continuous and isolated footings may
be designed using allowable (net) bearing pressures of 1800 and 2000 pounds per square foot
(psf), respectively. Allowable increases of 250 psf for each additional 1 foot in width and 250 psf
for each additional 6 inches in depth may be utilized, if desired. The maximum allowable bearing
pressure should be 3000 psf. The allowable bearing pressure applies to combined dead and
sustained live loads. The allowable bearing pressures may be increased by one-third when
considering transient live loads, including seismic and wind forces.
Based on the recommended allowable bearing pressures, the total static settlement of the shallow
footings is anticipated to be less than one -inch. Static differential settlement is anticipated to be
approximately one-half of the total settlement for similarly loaded footings spaced up to
approximately 50 feet apart.
Lateral load resistance for the spread footings will be developed by passive pressure against the
sides of the footings below grade and by friction acting at the base of the footings. An allowable
passive pressure of 250 psf per foot of depth may be used for design purposes. An allowable
coefficient of friction 0.45 may be used for dead and sustained live loads to compute the frictional
resistance. Under seismic and wind loading conditions, the passive pressure and frictional
resistance may be increased by one-third.
If there are any questions regarding this report or the testing summarized herein, please contact
the undersigned.
Respectfully submitted
SLADDEN ENGINEERING
Brett L. Anderson
Principal Engineer
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Sladden Engineering
Project Name: Desert Club Apartments Project No.:522-19186
Location : 41480 Desert Club Dr, La Quinta,California Report No.:23-01-025
Date Tested
TEST RESULTS
Location
Building A
Elevation
Dry Density
in place
% Moisture
in place
Relative
Compaction
Maximum
Density
Test No
1
12/22/22
Per Plan
5.00' BPG
113.0
10.7
93
121.0
2
12/22/22
Per Plan
5.00' BPG
110.8
11.5
92
121.0
3
12/22/22
Per Plan
5.00' BPG
112.6
12.1
93
121.0
4
12/22/22
Per Plan
5.00' BPG
111.2
11.7
92
121.0
5
12/22/22
Per Plan
5.00' BPG
110.9
12.2
92
121.0
6
12/27/22
Per Plan
3.50' BPG
107.2
13.1
92
117.0
7
12/27/22
Per Plan
3.50' BPG
104.9
14.7
90
117.0
8
12/29/22
Per Plan
2.00' BPG
108.4
8.4
93
117.0
9
12/29/22
Per Plan
2.00' BPG
109.1
6.0
93
117.0
10
12/29/22
Per Plan
2.00' BPG
107.8
7.0
92
117.0
11
12/29/22
Per Plan
2.00' BPG
108.3
6.8
93
117.0
12
01/03/23
Per Plan
PG
109.5
9.5
94
117.0
13
01/03/23
Per Plan
PG
110.3
8.0
94
117.0
14
01/03/23
Per Plan
PG
108.5
9.0
93
117.0
15
01/03/23
Per Plan
PG
109.0
9.2
93
117.0
BPG = Below Pad Grade
PG = Pad Grade
January 12, 2023 1 Sladden Engineering
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