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Home My WebLink AboutCT 02-28; LA COSTA CONDOMINIUMS; PAD CERTIFICATIONS; 2012-02-14. XJ- U LMUJJ iA~}. : - - LA COSTA 'ov CONDO4UDflUMC •k : uui L '1 IS. 1IT iXQA ¶1) Lc'dJNo &iLP3MPJ.L •• __f•) . . II - - - ' - - -. -' • • - c.-: - .. -_.c ,'-i#•;- - _f:? , @wpm&L'F1llhiTiI ?'i T GEOTECHVIC4L ENGINEERING / MATERIALS TESTING &INSPECTION American Geotechnical, Inc.. GEOTECHNICAL ENGINEERING/ MATERIALS TESTING & INSPECTION February 14 2012 File No 23280-12 Mr. Kwan So LA COSTA VISTA, LLC : 2683 Costebelle Drive La Jolla, California 92037 Subject: PAD CERTIFICATION LETTER FOR BUILDING PADS 9 TO 12 AND POOL HOUSE PAD LA COSTA CONDOMINIUMS Carlsbad, California Reference: "Revised Update Geotechnical Report, Proposed La Costa Condominiums, Lot 185, La Costa Avenue South - Unit 1, Carlsbad Tract No. 02-28, Carlsbad, California," prepared by American Geotechnical, dated February 14, 2008. "Grading Plans for La Costa Condominiums, Carlsbad, Ca," prepared by O'Day Consultants, dated March 16, 2010. "Report of Observation and Testing Services during Site Grading, La Costa Condominiums," prepared by American Geotechnical, dated October 24, 2011. Dear Mr. So, Pursuant to your request, American Geotechnical has prepared this letter regarding observation and testing services performed during the grading of building pads 9 to 12 and the pool house pad at the subject development. Based on the results of our observation and testing, we certify that the pad areas stated to receive buildings 9 through 12 and the pool house were graded in general accordance with the recommendations provided in the Geotechnical Reports and Grading Plans referenced above. Based on our laboratory testing, the foundation categories for building pads 9 through 12 and the pool house are as follow: Building Pad # Expansion Index Foundation Category 9 - 84 10 84 11 94 II. 12 88 Pool House 76 The parameters for the foundation categories, our relative compaction testing and daily reports pertaining to the subject pads are presented in our observation and testing report referenced above. The results of our expansion testing for the subject pads are presented in Attachment A. 22725 Old Canal Road, Yorba Linda, CA 92887 - (714) 685-3900 - FAX (714) 685-3909 5764 Pacific Center Blvd., Suite 112, San Diego, CA 92121 - (858) 450-4040 - FAX (858) 457-0814 3100 Fite Circle, Suite 103, Sacramento, CA 95827 (916) 368-2088 FAX (916) 368-2188 5600 Spring Mountain Road, Suite 201, Las Vegas, NV 89146 - (702) 562-5046 - FAX (702) 562-2457 I File No. 23280-12 : flAmerican Geotechnical Inc February 14, 2012 EXPANSION INDEX TEST ASTM 04829 Project name: G5 File No. PM:_____ date:_____ American Geotechnical sample location: PAD 9tr <2.-0_6 __address:_____________________ tested samplepreparation wet soll+tare: 2_ £ drysoil+tare: 2- moisture lost: 13.6 dry soil weight tare weight: moisture content(%) testing data inches moisture content(w) of bOg sample: LI._I ring weight: j gq.-7 grams soil+nng weight grams soil(Wt): grams % saturatlon=2.7wWt/(556+556w-Wt)= 1 where: w=moisture content as a decimal Wt-welght of soil in grams A. initial dial reading B. dial reading at 10 minutes .7.-'3_<C_inches C. final dial reading after 24 hours 'l8 g inches flnatvercent saturation final wet weight soil+ring+tare 7 grams final dry weight soil+nng+tare 1 .grams wet soil(Wf). 1157.7 grams dry soll(Ws) _s-'.6 grams final water content(w) '_6.9 % final % saturation=27wWs/556[1+(C-A)]-Ws= q 1. expansion index: (C-B)x1000= 1.0+(B-A) expansion potential: M /L3/LI tareweight -7f7o.grams - - - - - - - - - - - - - - - - - - EXPANSION INDEX TEST ASTM D4829 American Geotechnical Project name: LA Co5a* File No. _Q —f PM:G date:-.Z- 16 /1 -1-- _______ sample location: )ci) (2_C) 6 ' address: tested sample preparation moisture content(w) of bOg sample: I I ring weight: g i_c grams soil+ring weight: çg, grams soil(Wt): ? AO '2w. grams % saturat1on2.7wWt1(556+556w-Wt)= 4'. 1, where: w--moisture content as a decimal - Wt=welght of soil in grams wet soll+tare: dry soil+tare: 25O .3 moisture lost (3.0 dry soil weight: I tare weight moisture cOntent(%) I testmci data A. initial dial reading . (Cf3 ( inches B. dial reading at 10 minutes f2- inches C. final dial reading after 24 hours '- ? I Inches final percent saturation final wet weight soil+nng+tare 7 i' 1 I grams final dry weight soil+nng+tare 7 O. grams wetsoil(Wf) 13I.1- grams dry soil(Ws)310.S grams final water content(w) 2. final % saturation=2.7wWs/556[1+(C-A)]-Ws= i3 expansion index: (C-13)x1000= 1.0+(B-A) 8 4f expansion potential: -/14 i)11.1 I-j tare weight .I—grams I - - - - - - - --M - - - - - - - - - EXPANSION INDEX TEST ASTM 134829 Project name: 1'4 sample hcat10n: V t) oi l rnaeture n1enlw) 01 icog sample: /2- nngweight q4j grem sod+aing weight S"7 grams soil(Wt}: 371 j grams % satiiralioo2.7wWt((556+556w-W() 3j where: w melst*ZB content as a decnai WI=welghtol sot In grants American Geotethmcal File No. 2-3zO -/ il .t _ (1 _dress: Il tested ___________ saniplearaoarallen wet sol[+tam: dry scil+tam: 2_ it&- - molstjre lost j cj' - dry soil weight: I -O. teweightJjZ uucon%) Mug data A.initial that readlng 4t inches B. dial reading at 10 mtes inches C. final dial reading alter 24 hours i Inches flm percent satuggft Final wet rig+Ime 79 grams final dry weight sod*rfng+lare 7 ._I_grams wetsoil(Wl _grams dry soll(Ws)'grams firiaIwaIaccon1ant(w______________ tam weight, (7oI grams final % sabjration2.7wWs/556[1+C-A)]-Ws ________ expansion index _B)xl000= 1.0+(B-A) expansion potential: I4t 64 — — — — — — — — — — — — — — — — — — EXPANSION INDEJ(TEST ASTM D4829 Project name: CO~74 sample kcal3on: P Ab It 2 ) -6 14 —address: Atnerkan Geotechnical date:_____ te8led tiy 701 Flie No. PM, GG4 moisture contentw)of lOOg sample: nngwet t q67 grams soi+rg weight 7 grams sa(Wl): 3 'i- grams % uration=27wWtI(556f556w-Wt= S). %*aw. vFqna[sturecorrbwA as deal Wt'deight of sod in grams wet soil+tarc: dry soilre: 2f5 2- . nwlsturelost dsIighL-%' IO v,elght *1 reeca%) i.l testing_data - A. Initial diai readbrig __ Inches a dial reading al 10 minutes - ç- Inches C. final dial reading after 24 hours ? (_Inches - final percent eMiiratlon final wet weight sol+rIng+lare 2 47.'(__gmsne final dry weight scit+rrig+lare 7 0 7 7 grams wet soil(M) _4Qd 7_grams - dry soll(Ws) cO grams fie=1 v.ata co1mt(w final % saturation2.7wWs/556f1*(C-A)lWs= - gj expansion index: (c-B)xi000= 1.0(B-A) expansion potential: M 174I L1141\ tarweight ____grunts Jr 2-3 2410 —i1- PM:____ address: sample preparation American Geotechnical date: tested Projei sample - - - - - - - - - - - 11 - - - - - - - - EXPANSION INDEX TEST ASTM D4829 moisture content(w) of bog sample: / 2. C) % ring weight j 82-' grams soil-f ring weight: 7 grams soil(Wt): 37 grams % saturation=2.7wWtl(556+556w-Wt)= Mere: w=molsture content as a decimal Wt--weight of soil in grams wet soil+tare: dry soil+tare: 2.- moisture lost: dry soil weight: tare weight I 3 3 moisture ntent(%) testing data A. Initial dial reading inches B. dial reading at 10 minutes .2-6v inches C. final dial reading after 24 hours S10 S inches final oercent saturation final wet weight soil+ring+tare 7 ''2.-•' grams final dry weight soil+nng+tare _1 _J _grams wet soil(Wf) 'ti-q.7 grams dry soll(Ws)i .6 tgrams final water content(w) 'i-6 .1 tare weight /_6 _ grams 1 final % saturation=2.7wWs/556[1+(C-A)]-Ws= 91.0 % expansion index: (C-B)x1000= 1.0+(B-A) expansion potential: I I I. I I I I I I I I I American Geotechnical, Inc. GEOTECHNICAL ENGINEERING / MATERIALS TESTING & INSPECTION November 1, 2011 : File No. 23280-12 Mr. Kwan So LA COSTA VISTA, LLC 2683 Costebelle Drive La Jolla, California 92037 Subject: PAD CERTIFICATION LETTER FOR BUILDING PADS I TO 8 LA COSTA CONDOMINIUMS Carlsbad California Reference: "Revised Update Geotechnical Report, Proposed La Costa Condominiums, Lot 185, La Costa Avenue South - Unit 1, Carlsbad Tract No. 02-28, Carlsbad, California," prepared by American Geotechnical, dated February 14, 2008. "Grading Plans for La Costa Condominiums, Carlsbad, Ca" prepared by O'Day Consultants, dated March 16, 2010. "Report of Observation and Testing Services during Site Grading, La Costa Condominiums" prepared by American Geotechnical, dated October 24, 2011. Dear Mr. So Pursuant to your request, American Geotechnical has prepared this letter regarding observation and testing services performed during the grading of building pads 1 to 8 at the subject development. Based on the results of our observation and testing, we certify that the pad areas stated to receive buildings 1 through 8 were graded in general accordance with the recommendations provided in the Geotechnical Report and Grading Plans referenced above. The findings of our observation and testing services including relative compaction and expansion testing results and foundation recommendations for the pads are presented in our observation and testing report referenced above. We appreciate the opportunity to be of service. If you should have any questions, please do not hesitate to contact us. Sincerely AMERICAN GEOTECHNICAL INC.OFESS CM rn IO UJ No C70015 rn Guillaume Gau CC Project Engineer RCE 70015 CAL GG:ks Distribution Mr. Kwan So - (1) Via Mail Only Mr. Greg Lindhoff - (6) Via Hand Delivery 22725 Old Canal Road, Yorba Linda, CA 92887 - (714) 685-3900- FAX (714) 685-3909 5764 Pacific Center Blvd., Suite 112, San Diego, CA 92121 - (858) 450-4040 -FAX (858) 457-0814 3100 Fite Circle, Suite 103, Sacramento, CA 95827 (916) 368-2088 FAX (916) 368-2188 5600 Spring Mountain Road, Suite 201, Las Vegas, NV 89146 - (702) 562-5046 - FAX (702) 562-2457 American Geotechnical, Inc. GEOTECHNICAL ENGINEERING / MATERIALS TESTING & INSPECTION September 16, 2011 File No. 23280-12 Mr. Kwan So LA COSTA VISTA, LLC 2683 Costebelle Drive La Jolla, California 92037 Subject: SUBGRADE COMPACTION LETTER FOR BUILDING PADS 9 TO 12 LA COSTA CONDOMINIUMS Carlsbad, California Reference: "Revised Update Geotechnical Report, Proposed La Costa Condominiums, Lot 185, La Costa Avenue South - Unit 1, Carlsbad Tract No. 02-28, Carlsbad, California," prepared by American Geotechnical, dated February 14, 2008 "Grading Plans for La Costa Condominiums, Carlsbad, Ca" prepared by O'Day Consultants, dated March 16, 2010 Dear Mr. So, Pursuant to your request, American Geotechnical has prepared this letter regarding observation and testing services performed during the grading of building pads 9 to 12 at the subject development. Based on the results of our observation and testing, it is our opinion that the subgrade in the areas stated to receive the basement retaining walls for buildings 9 through 12 were compacted in general accordance with the recommendations provided in the report and grading plans referenced above. At this point in time, these areas are suitable to begin the excavation of the foundation of the basement retaining walls. The findings of our observation and testing including as-built changes and relative compaction results for the basement wall areas will be presented in our final grading report that will be issued in the near future. We appreciate the opportunity to be of service. If you should have any questions, please do not hesitate to contact us. Sincerely, AMERICAN GEOTECHNICAL, INC. tv f9# No. C70015 Guillaume Gau . $(\ ExpL32I2.' Project Engineer R.C.E. 70015 GG: km Distribution: Mr. Kwan So - (1) Via Mail Only Mr. Greg Lindhoff—(1) Via E-Mail & Mail 22725 Old Canal Road, Yorba Linda, CA 92887 - (714) 685-3900 - FAX (714) 685-3909 5764 Pacific Center Blvd., Suite 112, San Diego, CA 92121 -(858) 450-4040 - FAX (858) 457-0814 10398 Rockingham Drive, Suite 4, Sacramento, CA 95827- (916) 368-2088 - FAX (916) 368-2188 5600 Spring Mountain Road, Suite 201, Las Vegas, NV 89146 - (702) 562-5046 - FAX (702) 562-2457