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BRES2015-0029 Geotechnical Reportsladen Engineering 45090 Golf Center Parkway, Suite T, Indio, CA. 92201 (760) 863-0713 Fax (760) 863-0847 6782 Stanton Avenue, Suite A. Buena Park. CA 90621 (714) 523-0952 I'm (714) 523-1369 450 Egan Avenue. Beaumont, CA 91223 (951) 845-7743 I'm (951) 845-8863 800 1:. Florida Avenue, Hemet, CA 925=13 (95 1) 766-8777 ftLx (95 1) 766-8778 January 12, 2015 Kristi W. Hanson, Architects, Inc. 72-185 Painters Path, Suite A Palm Desert, California 92260 Project: Custom Residence 52-687 Ross Avenue Lot 18A — Madison Club La Quinta, California Project No. 544-14082 15-01-019 w Drfrce' CITY OF LA QUINTA BUILDING DIVISION APPROVED FOR CONSTRUCTION Subject: Soluble Sulfate Content Ref: Geotechnical Update prepared by Sladden Engineering dated March 27, 2014 Project No. 544-14082, Report No. 1.4-03-126 As requested, we have sampled the surface soil on the subject lot to determine the soluble sulfate content as it relates to selecting appropriate concrete mix designs. Testing indicates that the site soil is considered generally non -corrosive with respect to concrete. The testing indicated a soluble sulfate content of 250 ppm (0.025 percent) that corresponds with "negligible" exposure category in accordance with Table 3 of ACI 318-08 Chapter 9. Based upon the laboratory test results, sulfate resistant concrete mixes should not be necessary. If you have questions regarding this letter, please contact the undersigned. Respectfully submitted, SLADDEN ENGINEERING Brett L. Anderson sf° ' Principal Engineer ti Letter/gvm Copies: 4 / Addressee Sladde'n Engineering 6782 Stanton Ave., Suite C, Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369 45090 Golf Center Pkwy, Suite F, Indio, CA 92201 (760) 863-0713 Fax (760) 833-0847 450 Egan Avenue, Beaumont, CA 92223 (951) 845-7743 Fax (951) 845-8863 Date: January 12, 2015 Account No.: 544-14082 Customer: Discovery Builders California/DBCA Location: Madison Club, Lot 18A, 52-687 Ross Avenue, La Quinta T Analytical Deport Sulfate Series Soluble Sulfates Soluble Chloride per CA 417 per CA 422 PPM ppm 4 250 150 0 Sulfate: 544-14082 011915 X31 'TABLE 19=A-2—REQUIREPAERTS FOR SPECIAL EXPOSIIaF rnwmmnt.ie TABLE 19-A-3—REQUIREMENTS• FOR CONCRETE EXPOSED TO St11 . SULFATE EXPOSURE WATER-SOLUBLE SULFATE JSO 1 IN SOIL, P RC HTAGE BY WEIGHT �tIh11MUM 1�, CEMEWr TYPE MAiIMUld • • NORMAL' -WEIGHT AIM . Maxlmum 4Ynlnr- Camentlloua MdtarlaleaRntlo,by:. W Ng ht, •- Normal•Walght Aoort-i; Concretar WATER:tF1dENiITjOU5 MATERIALS' RAtld; BY • :' UGhifµ/EIGl{T.• AGGREGATE•EOFICRE E� EXPOSURE CONDITION .WEIGIiTrNORlAACWEIGHT• AGGREGATE CObiCRI fL • 0-150 x o.00689•lor MPa Cont:rete intended to have low permeability when exposed to water 0.50 4,0M Concrete exposed to'frcezing and thawing in a moist 030• 4,000 condition or to deicing chemicals 0.45 - - 'For For coir onion proleetion for reinforced concrete 0.45 4,500 S00 exposed to chlorides from deicing r-hcmicals, salts or '%vatcr, Very severt 'Alowcrwater Over 2.00 le brackish orsprayfmm these sources V lus P poanlans 0.45 4.500 0.40 5,600 TABLE 19-A-3—REQUIREMENTS• FOR CONCRETE EXPOSED TO St11 . SULFATE EXPOSURE WATER-SOLUBLE SULFATE JSO 1 IN SOIL, P RC HTAGE BY WEIGHT SULFATE (SO,;) Ul WATER, ppm CEMEWr TYPE NORMAL-WEJGHT AGGREGATE LIGHTWEIGHT :AGGREGATE CONCRETE - Maxlmum 4Ynlnr- Camentlloua MdtarlaleaRntlo,by:. W Ng ht, •- Normal•Walght Aoort-i; Concretar f^, Nortnnl- Vibloht•and Llohtwclohl' -Aoo?9ote• . Conerela, pill x a.00689'for MPa Negligible 0.00-0.10 0-150 Modcratc2. 0.10-020 150-1,500 11,1P(MS),is (MS) 030• 4,000 Seven= 0.20-2.00 1,50040,000 V 0.45 4,500 Very severt 'Alowcrwater Over 2.00 le Over 10,000 V lus P poanlans 0.45 4.500 -c cn Ous materials rano or higher sgtngth may bcttcluircd for low permeability -or forprotcction ' 2 Seawater against eorrosion'of embedded items or freezing and thawing (Iablz 19=A-2). 3Poaolan that has been determined by cost or service record to improve sulfat tauung 7Ij V ccmcnt e rtsislartee when used in concrete con - 2 -264 i Sladden Engineering 45090 Golf Center Parkway, Suite F, Indio, CA 92201 (760) 863-0713 Fax (760; 863-0847 6782 Stanton Avenue, Suite A, Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369 450 Egan Avenue, Beaumont, CA 92223 (951) 845-7743 Fax (951) 845-8853 800 E. Florida Avenue, Hemet, CA. 92543 (951) 766-8777 Fax (951) 766-8'78 March 27, 2014 Proje--t No. 544-14082 14-03-126 Discovery Builders California, LLC 80-955 Avenue 52 La Quinta, California 92253 Subject: Geotechnical Update FILE COPY Project: Proposed Custom Residence 52-687 Ross Avenue Lot 18A - The Madison Club La Quinta, California Ref: Geotechnical Investigation Report prepared by Sladden Engineering dated January 28, 2005; Project No. 544-4810, Report No. 05-01-101 Report of Testing and Observation During Rough Grading prepGred by Sladden Engineering dated March 2, 2006; Project No. 522-4810; Report No. 06-02-1102. As requested, we have reviewed the above referenced geotechnical reports as t=iey relate to the design and construction of the proposed custom residence to be to be constructed at 52-687 Ross Avenue within the Madison Club development in the City of La Quinta, Cali-tornia. It is our understanding that the proposed residential structure will be of relatively lig�tweight wood - frame construction and will be supported by conventional shallow spread footings and concrete slabs on grade. 03. The subject lot was previously graded during the rough grading of the Madison c=lub project site. The rough grading included recompaction of the native surface soil along with she placement of engineered fill material to construct the building pads. The site grading is summarized in the referenced report of Testing and Observation During Rough Grading along witF the compaction test results. ' Because the lot has been previously rough graded, the remedial grading requ_red 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 vegetaticn, scarified and moisture conditioned prior to precise grading. The exposed surface should be compacted to a minimum of 90 percent relative compaction prior to fill placement. The previou3ly 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. Sladd�n Engineering J March 227, 2013 -2- Proje=t No. 544-14082 14-03-126 The referenced reports include recommendations pertaining to the constructicn of residential structure foundations. The previous reports also address the potential for liquefaction, subsidence and differential settlement. Based upon our review of the referenced reports, it is our opinion that the structural 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 Geotechni©l Investigation report remain applicable. Conventional shallow spread footings should be bottomed into properly compacted fill material a minimum of 12 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 inc--eases of 300 psf for each additional 1 foot of width and 300 psf for each additional 6 inches o- 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 friceional 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 low" 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 summarized the current seismic design parameters for the proposed structure. The seismic design categor+ for a structure may be determined in accordance with Section 1613 of the 2013 CBC or ASCE7. According to the 2013 CBC, Site Class D may be used to estimate design seismic loading fo_ the proposed structures. The 2013 CBC Seismic Design Parameters are summarized below. Risk Category (Table 1.5-1): I/II/III Site Class (Table 1613.3.2): D Ss (Figure 1613.3.1): 1..513g S1 (Figure 1613.3.1): 0.7128 Fa (Table 1613.3.3(1)): 1.0 Fv' (Table 1613.5.3(2)):1.5 Sms (Equation 16-37 (Fa X Ss)): 1.513g Sm1 (Equation 16-38 (Fv X S1)): 1.068g SDS (Equation 16-39 (2/3 X Sms)): 1.0098 SD1 (Equation 16-40 (2/3 X Sm1)): 0.712g Seismic Design Category: D SladdeR Engineering March 27, 2013 -3- Project No. 544-14082 14-03-126 We appreciate the opportunity 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 submitted, SLADDEN ENGINEERING <<�' �. L h XASON yG` Vo. C45389 Z Exp 730114 VIL Brett L. Anderson - ENGINEE Principal Engineer,, `rte SER/gvm Copies: Q Discovery Builders California, LLC n Sladden Engineering LA QUINTA Please verify that soils reports contain all of the above information. ad' clition, to assure continuity between the investigation/reporting stage and the execution stage, please use the following checklist to verify that the conclusions and recommendations in the report cover all the required elements. Only then can we be assured that the construction documents address all of the site soil conditions. La Quinta Geotechnical Report Checklist Does the "Conclusions and Recommendations" section of the report address each of the following criteria? "Address" means: (a) the criterion is considered significant and mitigation measire(s) noted, -or; (b) the criterion is considered insignificant and explicitly so stated. Yes No Criterion .19 ❑ Foundation criteria based upon bearing capacity of natural or compacted soil. ❑ Foundation criteria to mitigate the effects of expansive soils. ❑ Foundation criteria based upon bearing capacity.- of natural or --compacted soil. ❑ Foundation criteria to mitigate the effects of liquefaction. ❑ Foundation criteria. to mitigate the effects of seismically induced differential settlement. ! ❑ Foundation criteria to mitigate the effects of long-term differential settlement. Foundation criteria to mitigate the effects ofwarying soil strength. ❑ Foundation criteria to mitigate expected total and differential settlement. Any "No" answers to the -above checklist should be noted as specific required coh'ections. i Sladden Engineering 45090 Gulf Center Parka:av, Suite F, Indio, CA 92201 (760) 863-0713 Fax (760) 863-1IE47 6782 Stnnlon Avenue. Suite A, Buena Park. CA 90621 (714) 523-09,12 Fax (714) 523-130 450 Lean Avenue, Beaumont, CA 92223 (95 1) 845-7743 Fax (951) 845-8863 800 L. Florida Avenue. Hemet, CA 92543 (951) 766-8777.Fax (951) 766-8778 January 7, 201.5 Project No. 544-1.4082 15-01-007 Kristi W. Hanson, Architects, Inc. 72-1.8.5 Painters Path, Suite A Palm Desert, California 92260 Project: Proposed Custom :Residence 52=687 Ross Avenue Madison Club La Quinta, California Subject: Foundation and Grading Plan Review Ref: Geotechnical update prepared by Sladden Engineering dated March 22, 2014; Project No. 544-14082, Report No. 14-03-126 As requested, we have reviewed the Preliminary Grading Plans prepared by McGee Surveying, Inc. along with the Foundation Plans and Details prepared by Young Engineering Services. The plans reviewed included plans for the main house and guest house to be constructed at 52-687 Ross Avenue within the Madison Club development in the city of La Quinta, California. Based on our review, it is our opinion that the recommendations provided in the above referenced Geotechnical Investigation report have been properly incorporated into these plans. If you have questions regarding this memo or the above referenced report, please- contact the undersigned. Respectfully submitted, SLADDEN ENGINEERING Brett L. Andersbn Principal Engineer Letter/gvm Copies: 2 / Kristi W. Hanson 2 / Young Engineering FILE COPY 1