BRES2016-0199 Geotechnical Report UpdateSladden E ngineeri ng
45090 Golf Center Parkway, Suite F, Indio, CA gZZ0l (760) S6il)713 Fax (260) 8634847
6782 Sunton Avenus Suite d Buena Parlq Ce 90621 (7t4) SZ3-0952 Fu (714)523-1369
450 Egan Avenue, Beaumon! cA922?3 (951) 845-7743 Fax (95r) 845-8863
800 E. Florida Avcnue, Hemer, cA.9zs43 (95t) 7G6-8777 ru (951) ?6G-8778
May 26,201.5 Project No. 54&15138
L6-05-212
Mr. Bob Safai
c/o Hayer Architecfure, hrc.
445 Marine View Avenug Suite 280
Del Mar, California 92A1.4
Subject: Geotechnical Update
Project:Proposed Custom Residence
81-454 Amundson Avenue
The Madison Club - Lot 198
La Quinta, California
Ref:Geotechnical Investigation Report prepared by Sladden Engineering dated January
28, 2005 ; Project No. 544-481 0, Report No. 05-01-101
Report of Testing and Observation During Rough Grading prepared by Sladden
Engineering dated March 2,2006; Project No.522-4810; Report No.0G02-tzo
As requested, we have reviewed the above referenced geotechnical reports as they relate to the
design and consFmction of the proposed custom residence to be constructed on the site located at
81-49 Amundson Avenue within the Madison CIub development in the City of La Quinta,
California. It is our understanding that the proposed residential structure will be of rela
lighrweight wood-frame construction and will be supported fH'ffiJmrFnfootings and concrete slabs on grade.
BUILDIN G & SAFEW DEPT.
The subject Iot was previously graded during the rough gradin 1"I".
T}re rough grading included over-excavation and recom
with the placement of engineered fill material to construct the
summarized in the referenced report of Testing and observa
with the compaction test results.
ilding SI ding is
Because the lot has been previously rough graded, the remedial grading required at this time
should be minimal provided that the building area that falls within the previously assumed
building envelope. The building areas should be cleared of surface vegetation, scarified and
rnoisture conditioned prior to precise grading. The exposed zurface should be compacted to a
minimum of 9O percent relative compaction prior to fill placement. The previously removed soil
and any fill material should be placed in thin lifts at near optimum moisture content and
compacted to at least 90 percent relative compaction.
Sladden Engineering
tt'wtp. S I adden en g i rt ee ring. conr w
(a
rof the
of
M"y 2:6,2015 -)-Project No.54S15138
15-05-212
The referenced reports include recornmendations pertaining to the construction of residential
structure foundations. The previous reports also address the potential for liquefaction,
zubsidence and differential settlement. Based upon our review of the referenced reports, it is our
opinion that the stnrctural values included in these reports remain applicable for the design and
construction of the proposed residential structure foundations.
The allowable bearing pressures recommended in the referenced Gmtectutical lnvestigation
report remain applicable. Conventional slrallow spread footings should be bottomed into
properly compacted fill material a minimum of tZ inches below lowest adjacent grade.
Continuous footings should be at least 12 inches wide and isolated pad footings should be at least
2 feet wide- Continuous footings and isolated pad footings should be designed utilizing
allowable bearing pressures of 1500 psf and 2000 psf, respectively. Allowable increases of 300 psf
for each additional 1 foot of width and 300 psf for each additional 5 inches of depth may be
utilized, if desired. The maximum allowable bearing pressure should be 3000 psf. The
recommended allowable bearing pressures may be increased by one'third for wind and seismic
loading.
Lateral forces may be resisted by friction along the base of the foundations and passive resistance
along the sides of the footings. A friction coefficient of 0.48 times the normal dead load forces is
recommended for use in design. Passive resistance may be estimated using an equivalent fluid
weight of 300 pcf, If used in combination with the passive resistance, the frictional resistance
should be reduced by one third to 0.33 times the normal dead load forces.
The bearing soil is generally non-expansive and falls within the "very lou/' expansion category in
accordance with the 2013 (CBC) classification criteria. Pertinent 2013 CBC Seismic Design
parameters are summarized on the following page.
Sladden has reviewed the 2013 California Building Code (CBC) and zummarized the current
seismic design parameters for the proposed structure. The seismic design category for a structure
may be determined in accordance with Section I 613 of the 201,3 CBC or ASCE7. According to the
2073 CBC, Site Class D rnay be used to estimate design seismic loading for the proposed
structures. T}re 2013 CBC Seismic Design Parameters are summarized below.
Risk Category (Table 1.5-1): l{llfill
Site Class (Table 1613.3.2): D
Ss (Figure 1613.3.1): 1.5159
St (Figure 1613.3.1 ): 0.711,9
Fa (Table 1613.3.3(1)): 1.0
Fv (Table 1613.5,3(2)): 1.5
Srns (Equation 1,5-37 {Fa X Ss}): 1 5169
Smt (Equation 1G38 {Fv X StJ): 1 .0659
Sos (Equation "1,639 l2l3 XSmsl): 1.01 1g
Sot (Equation 7GN lzlSX SmtJ): 0.711g
Seismic Design Category: D
Sladden Engineering
ttt tvw. S I a d de n e n g i n e er i n g. co m
May 2;5,20'/.,6 -3-Project No.544-15138
16.05-212
We appreciate the opporrunity to provide service to you on this project. If you have any
questions regarding this letter or the referenced reports, please contact the undersigned.
Respectfully zubmitted,
SLADDEN ENGINEERING
Brett L. Anderson
Principal Engineer
sER/db
4llr,dr. Bob SafaiCopies
Sladden Engineering
ttt tttr. S I o d d e n e n g i n e e r i n g. c o m
La Quinta t4-T6g
06/ 17 / t+
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Yes Grlterion
Foundation criteria based upon bearing eapaclty of natural or compacted soil.
Foundation criteria to rnitigate the effects of expansive soils.
Foundation criteria based upon bearlng capacity of natural or compacted soil.
Foundation criteria to mitigate the effects of riquefacilon.
53,i,3i#;i crlteria to mltisate the effects of setsmicary tnduced differenriat
Foundatlon criteria to mitigate the effects of long-term differential setttement.
Foundation criteria to mitigate the effects of varylng soil strength.
Foundation criterla to mitigate expected rotat and differenfial setflement.
ffillo":nswers to the above checklist shoutd be noted as spectflc required
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affirff;ffiI3;sions and Reommendations'secrion of the reporr address eadr of the
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Sladden Engineeri ng
45090 Golf Center Parkway, Suite F, Indio, CA.92201(760) 8634713 Fax (760) 863{M7
6782 Stanton Avenue, Suite C, Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369
450 Egan Avenue, Beaumont, CA92223 (951) 845-7743 Fax (951) 845-8863
800 E. Florida Avenue, Hemet, CA92543 (951) 766-8777 Fax (951) 766-8778
June 6,201,6 Project No.54416138
't6-0G223
Mr. Bob Safai
c/o Hayer Architecture, Inc.
445 Marine View Avenue, Suite 280
Del Mar, Californi a 92014
Project Proposed Custom Residence
81, -454 Amundson Avenue
The Madison Club - Lot 198
La Quinta, California
Subjec[ Soluble Sulfate Content
Ref:Geotechnical Investigation Report prepared by Sladden Engineering dated January
28, 2005; Project No. 544-481 0, Report No. 05-01 -1 01
Report of Testing and Observation During Rough Grading prepared by Sladden
Engineering dated March 2,2006; Project No.522-4810; Report No.0G02-120
As requested, we have reviewed the geotechnical update report prepared for the subject property
located at 81454 Amundson Avenue, Lot 198 located within the Madison Club residential
development with respect to soluble sulfate content as it relates to selecting appropriate concrete
mix designs. Laboratory testing indicated soluble sulfate content of 2400 ppm (0.24 percent) that
corresponds with the "severe" exposure category in accordance with Table 3 of ACI 318-08
Chapter 9. In accordance with ACI 318-08, special sulfate resistant concrete mix designs will be
required for structural concrete on this project. Structural concrete in contact with soil should
have a minimum compressive strength of 4500 psi and maximum water/cement content of 0.45. A
copy of the laboratory test results is attached.
this letter or the referenced report, please contact theIf you have
undersigned.
I
I
Respectfully su
SLA
Brett L.
Principal Engineer
Letter/clb
ro
Copies: 4 I Mr. Bob Safai
G
Sladden Engineeri ng
Date: June 6, 2016
Account No.: 544-16138
Customer: Mr. Bob Safai c/o Hayer Architecture, lnc
Location: Amundson Way, Lot 19B, La Quinta
Analytical Report
6782 Stanton Ave., Suite A, Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369
45090 Golf Center Pkwy, Suite F, lndio, CA922O1 (760) 86&0713 Fax (760) 863-0847
450 Egan Avenue, Beaumont,CA92223 (951) 845-7743 Fax (951) 845-8863
Sulfate Series
Soluble Sulfates
per CA 417
ppm
2400
Soluble Chloride
per CA 422
ppm
600
Sulfate 544-1 61 38 06061 6
a
.TAB LE 1 g-A.z-REOU IR EM E$ITS FO R SP ECI NI LXPOSUBE CONDMONS
IA_BLE 1 g-A-LB EQ.U I R EM Er{t-s:Fo R.co N c B ilEExpos E D To s u LFATE.eo uraili rr.tc'.So r.i-ffioNs
forp,rotcction'
concrctc coo-
2-M
IrAXrr.tuM - .
. w.ltrentruErrilTtorrs .. ..
. u,rrenrxl$- net{'s y -"...:I{EIG' T.'NOR MAL:Y'EIGHT.'
AGGhEGATE CONCRETE.x 0.00689.for HprConqrcrc inrcnded
axposcd to wa[ar
toh ava lorv pcrmebbiliry whqn
0.50 4,000
exposcd to'frcczing urd
or to deicing chcmicals
Concrc;.c lVrnI'tn a$morstIcondirion 0.45 4Joo
orts
0-4t)5,000
SUL-FATE
SPOSUBE
WATER- SOLUELE
SUTfATE
[Sor].lNSOiLpencErrr,toedv
WEIGHT.suHAffilffi3'N
CEAIEHTTTPE
}IOBHAL-WEIGHT
AGGBEGATE
UGHT.WEIGHT
:AGGHEGATE
. . -. coNcRE.rE .
Msxlrnurn'Wrlor-' Corncndllour
Mdtcrl a I r: F a tl o.-bc':- ' Wgsht -;'Hcimrl-Walglit;
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Corrcrctat
t./!,tlormal..')Yolohttnd
-:_lJghrrrik ht'' -aggruqrta
.Coocrc'tcy, psll
x O!0589'lor [.lPr.
Ncgligiblc.0-00{.10 0-150
Modcratc3 0.to{20 rs0-1J00 tr,IP(MS),IS
CMS)
o50-4,000
Scvcrc.0.2G200 I5BtO,000 v o45 4JOO
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EXPOSUBE CO}IDITION
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,a
Sladden Engineeri ng
45090 Golf Center Parkway, Suite F, Indio, CA,.9Z20l (760) 863-0713 Fax (760) 863{847
6782 Starton Avenue, Suite C. Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369
450 Egan Avenuc, Beaumont, CA 9?223 (951) 845-7743 Fax (951) 845-8863
800 E. Florida Avenue, Hemct. CA 92543 (951) 766-8777 Fax (951) 766-8778
June 6,2076 Project No.544-16138
76-06-223
Mr. Bob Safai
c/o Hayer Architecture, Inc.
445 Marine View Avenue, Suite 280
Del Mar, California 92014
Project:Proposed Custom Residence
81-454 Amundson Avenue
The Madison Club - Lot 198
La Quinta, California
Subject
Ref:Geotechnical Investigation Report prepared by Sladden Engineering dated lanuary
28, 2005; Project No. 544-4810, Report No. 05-01-101
Report of Testing and Observation During Rough Grading prepared by Sladden
Engineering dated March 2,2006; Project No. 522-4810; Report No. 06-02-120
As requested, we have reviewed the geotechnical update report prepared for the subject property
located at 81454 Amundson Avenue, Lot 198 located within the Madison Club residential
development with respect to soluble sulfate content as it relates to selecting appropriate concrete
mix designs. Laboratory testing inciicated soluble sr-rlfate content of 2400 ppm (0.24 percent) that
corresponds with the "severe" exposure category in accordance with Table 3 of ACI 318-08
Chapter 9. In accordance with ACI 318-08, special sulfate resistant concrete mix designs will be
required for structural concrete on this projc<t. Structural concrete in contact with soil should
have a minimum compressive strength of 4500 psi and maximum water/cement content of 0.45. A
copy of the laboratory test results is attached.
If you have qu estions lr,;1,[1 this letter or the referenced report, please contact the
undersigned.
Soluble Sulfate Content
n;:: -a IRespectfully su JA.
SLA
Brett L.
Princip al Engi neef
Letter/clb
C
I
Copies: 4 lMr. Bob Safai
I
Sladden Engineeri ng
6782 Stanton Ave., Suite A, Buena Park, CA 90621 (714) 523-0952 Fax(714) 523-1369
45090 Golf Center Pkwy, Suite F, lndio, CA 92201 (760) 863-0713 Fax (760) 863-0847
450 Egan Avenue, Beaumont, CA92223 (951) 845-7743 Fax (951) 845-8863
Date: June 6, 2016
Account No.: 544-16138
Customer: Mr. Bob Safai c/o Hayer Architecture, lnc
Location: Amundson Way, Lot 198, La Quinta
Analytical Report
Sulfate Series
Soluble Sulfates
per CA 41 7
ppm
2400
Soluble Chloride
per CA 422
ppm
600
Sulfate 5ar'.-16138 06061 6
.IAB LE 1 9 JA.z_FI EO U IR EI,{ ET.ITS FO R S P ECI A L LXPOSU N E CO.N DMONS
IA-qL q 1 s -4-3-R EgJJIg qr4 Et r:rs: Fo R .co N c B ETEEx po s E D To s u LFAre,co N.fA t ii r uc -S o urino rrrs
forprotcction '
concrc[c coo-
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. wATEBtF,,Jetr-irrJous,. ..
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AGGhEGATE CoNCFIETE .'x LlPrlnConqretctcndedloa.h vc lorv pcrmeibi ry whqn
AI,watcrtoposcd
0.50 4,000
d to'frcczing urd
eicing chcmicals
Concrclc crposc ln arha moistwing
ncondicio loor d 0.45 4,500
ts or
0.40 5,000
SULFATE
EXP.OSUBE
WATEN. SLUBLE
SUT.FATE
(sor).lN rcLPERGEHTAGEdY
WEIGHT .
suLrnre (so,) ]N
WATER, ppri'CEMEI{T TYPE
I.IOB}{AL-\YEJGHT
AGGBEGATE
ucrnvElclrr
:AGGFEGATE
, ... CONCRETE .
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x O.00689'lor LtPr_
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Modccatc3 0.t0{20 150-1J00 tr, IP(MS), Is
CMS)
'050-4,000
Scvcre 0.2G2.00 r50s10,000 v 0.43 4,500
Vcrlr scvcre Ovir2-OO Ovcr IO,0OO 'Vplus-
po:rzolanj
.ti.+s 4JOO
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EXPOSURECOHOTNON