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Home My WebLink AboutCD 2019-0010; CARLSBAD SEAWATER DESALINATION PLANT SEAWATER INTAKE MODFICATION; FINAL SOILS REPORT; 2020-12-24GEOTECHNICAL CONSULTANTS Carson 310.684.4854 | Concord 925.243.6662 | Rancho Cucamonga 909.989.1751 Rancho Cordova 916.631.7194 | San Diego 858.609.7138 | San Jose 408.362.4920 December 24, 2020 RMA Job No. 19-2285-0 Kiewit – Shea II, A Joint Venture 10704 Shoemaker Ave. Santa Fe Springs, CA 90670 Subject: Compaction Report Carlsbad Desalination Plant Seawater Intake Modification 4600 Carlsbad Blvd. Carlsbad, CA 92008 Gentlemen, In accordance with your request, we have completed this letter to document a series of in place density (compaction) tests that were taken within the subject site at the locations listed herein beginning on February 05, 2020 and continuing through March 20, 2020. The compaction tests were taken in subgrade, utility trench, and water main backfill. Field testing of the backfill was performed according to the direct transmission nuclear method, ASTM D6938. The maximum density-optimum moisture relationship was established in the laboratory according to ASTM D1557 test method. Excavation of building footing was over excavated 3ft and proof rolled per project documents. Excavation was backfilled using approved 2-sack slurry per approved RFI 016. A summary of the results of all tests performed is attached along with a plot plan showing the compaction test locations. The field density tests were taken at locations selected by our representative. The tests have been performed, as previously described, in accordance to generally accepted soil testing practices as well as the Geotechnical Exploration Report provided by Leighton Consulting on December 6, 2019. No other warranty, express or implied, is made. Respectfully submitted, RMA Group Jorge F. Meneses, PhD | PE | GE | D.GE Principal Geotechnical Engineer GE 3041 ~ ~~ RMAGroup Every Project Matters I www.rmacompanies.com GEOTECHNICAL CONSULTANTS Carlsbad Desalination Plant Seawater Intake Modification December 24, 2020 Job No. 19-2285-0 Page 2 of 7 Reference(s): 1. Tetra Tech. Carlsbad Desalination Plant Intake Pump Station Phase 1, Electrical Building Foundation Plan. C-0101 & C-3101. 2. Leighton Consulting, Inc. December 6, 2019. Geotechnical Exploration Report, Intake Pump Station Project, Carlsbad Desalination Project, City of Carlsbad, California. 3. Tetra Tech. Carlsbad Desalination Intake Pump Station – Phase 1, RFI 016. ~~~ RMAGroup Every Project Matters I www.rmacompanies.com GEOTECHNICAL CONSULTANTS APPENDIX A COMPACTION TESTS ~~~ RMAGroup Every Project Matters I www.rmacompanies.com GEOTECHNICAL CONSULTANTS Carlsbad Desalination Plant Seawater Intake Modification December 24, 2020 Job No. 19-2285-0 Page 4 of 7 MAXIMUM DENSITY – OPTIMUM MOISTURE RELATIONSHIPS: Material ID Test Method1 Description Maximum Density, pcf Optimum Moisture, % 1 M Light Brown Silty Sand (Native Subgrade) 125.3 10.3 2 M Base 124.5 9.6 1Test Method M – ASTM D1557 (Maximum Density Optimum Moisture Content Relationship) ~~~ RMAGroup Every Project Matters I www.rmacompanies.com GEOTECHNICAL CONSULTANTS IN-PLACE DENSITIES: Test No. Date Item Tested2 Location Test Method3 Test Depth, ft Moisture, % Dry Density, pcf Relative Compaction, % Material Type Carlsbad Desalination Plant Seawater Intake Modification December 24, 2020 Job No. 19-2285-0 Page 5 of 7 1 2/05/20 SG Electrical Building CMU Retaining Wall Footing N 3.0 16.8 115.2 91.9 1 2 2/05/20 SG Electrical Building CMU Retaining Wall Footing N 3.0 16.0 115.8 92.4 1 3 2/05/20 SG Electrical Building CMU Retaining Wall Footing N 3.0 16.2 115.8 92.4 1 4 2/25/20 WM HDPE 63” Pipe Line N 8.0 7.4 114.3 91.2 1 5 3/02/20 UT 50’ S/E of the Guard Station N .0.9 8.4 120.3 96.0 1 6 3/02/20 UT 150’ S/E of the Guard Station N 0.9 8.5 119.0 95.0 1 7 3/02/20 WM 63” HDPE Water Main Trench Line N 6.0 8.4 114.1 91.1 1 8 3/02/20 WM 63” HDPE Water Main Trench Line N 4.0 8.0 113.3 90.4 1 9 3/02/20 WM 63” HDPE Water Main Trench Line N 2.0 8.1 112.9 90.1 1 10 3/02/20 WM 63” HDPE Water Main Trench Line N 0.0 7.6 115.2 91.9 1 11 3/07/20 UT 75’ S/E of the Guard Station N 0.3 8.3 119.0 95.6 2 12 3/07/20 UT 175’ S/E of the Guard Station N 0.3 8.7 119.4 95.9 2 13 3/20/20 UT 140’ of Ductbank G Electrical Building to Intake, 35’ W/o RW Footing at Existing Pavement N 1.5 10.7 121.9 97.3 1 14 3/20/20 UT 140’ of Ductbank G Electrical Building to Intake, 75’ W/o Electrical Buiilding Footing N 3.0 14.5 119.5 95.4 1 15 3/20/20 UT 140’ of Ductbank G Electrical Building to Intake. 20’ into N/S Road N 1.5 14.1 116.3 92.8 1 16 3/20/20 UT 140’ of Ductbank G Electrical Building to Intake at the Bend N 3.0 13.8 119.2 95.1 1 17 3/20/20 UT 140’ of Ductbank G Electrical Building to Intake N 2.0 15.5 124.4 99.3 1 2Item Tested: SG – Subgrade UT – Utility Trench WM – Water Main Backfill 3Test Method: N - ASTM D6938 (Density of Soil In-Place by Direct Transmission Nuclear Method) ~~~ RMAGroup Every Project Matters I www.rmacompanies.com GEOTECHNICAL CONSULTANTS APPENDIX B PLOT OF COMPACTION TESTS ~~~ RMAGroup Every Project Matters I www.rmacompanies.com Kiewit - Shea II JV10704 Shoemaker Ave.Santa Fe Springs, CA 90670DATE:Test Location MapCarlsbad Desalination Plant4600 Carlsbad Blvd.Carlsbad, CA 92008105-04-2020BASE MAP PROVIDED BY: Tetra Tech, Carlsbad Desalination Plant Intake Pump Station Phase 1, Electrical Building Foundation Plan S-2101.THIS PLAN HAS BEEN PREPARED FOR USE AS A TESTLOCATION MAP AND IS NOT INTENDED FORCONSTRUCTION.APPROVED BY:JMCHECKED BY:RODRAWN BY:JAMFIGURE NO.:RMA JOB NO.:19-2285-0RANCHO CUCAMONGA, CA 91730909.989.1751 · FAX 909.989.428712130 SANTA MARGARITA COURTwww.rmacompanies.com*EOTECHNICAL EN*INEERIN* CONSTRUCTION INSPECTION MATERIALS TESTIN*LegendX- Approximate location of density test0848161"=8'123/ 0 ~ ~ I I I I I I I I I I I I I I CIB I __. 0 I I I I I I I I I I I I I I I I I I I I (/: 0 1 ~ I ~ I I I I I I I I I I I I I I I r I I I y/ ; t-:::/ L ___ , __ _ '.::: ~ "' 9 15' -10" \ "' 11' -10" ITEMPLAN CHANGESDESCRIPTIONDATEBYKiewit - Shea II, A Joint Venture10704 Shoemaker Ave.Santa Fe Springs, CA 90670DATE: Compaction ReportCarlsbad Desalination Plant Seawater Intake Modification4600 Carlsbad Blvd.Carlsbad, CA 9200821 OF 2December 2020 LEGEND BASE MAP PROVIDED BY:Tetra TechRANCHO CUCAMONGA, CA 91730909.989.1751 · FAX 909.989.4287GEOTECHNICAL ENGINEERING CONSTRUCTION INSPECTION MATERIALS TESTING12130 SANTA MARGARITA COURTwww.rmacompanies.comDRAWN BY:JPFIGURE NO.:SHEET NO.:RMA JOB NO.:19-2285-0-Test Location141098741413161715SCALE: 1" = 25'~ I I I l I I CON~TRUCT 2~8 LF OF(jl3" H□PE lj"IPE WITl1 WATER ljl<3HT JOlr TS 25 20 . TEXISTBRl',E · · ,/ Dlsct!A~~E VAULT . (BE'fOND . . 1._ F ROPOSE b 2· PVC , VATER rEXl!J SURFACE (BEYOND) . . . ~CLOFf'll"E 1§ .!.Q ·I· I I v~SEC~~TYF:NLi : ·1-.. ±25' -1-I l ·1. ~ -----K ACCESS ROAD : ·~: :-----' < .____•: ·1 · -: : EU;CDl,ICTE!.ANK : , ---~._.:_ > ~ " • _ / {2.5'WX1.!l'D} 7 _§ ~-=~-11==---~t--I-=--t~=t._~~f-==1-~-~-t_-_-_-_t---f--1r~,-~+--f--~-~-;-f----t--}---~--J-·~_·-=1~1o~-~1--1,,!11±,1:~l11~~---j-~,h-.~r~~=· t-dr--~"'-~-1 --"'-MUC.T-'1"1'~~p--+-------l lo' --"' 0 C Q 0 g . I!:. .:.§ t------1 ~~ -10 0+90 1+00 CONNE:CTTQ PRQP 2' F'VC WATER LINE /INSTAU.2"TEE INSTAU.2"GATEVALVE 1t 11 l / s,: 1•2i,39 ; HORIZLPT I I I I RMA Group w:rr Prrti«I M tte www rmocomp(1n•r.-com 1+50 --~~=.:_~ ... , _)(\ - - --" --\ / \ BEGIN CONSTRUCTION / r STA1+00.M . -1.lii'IO. \ -\_1 ROPOSEl1) 63" HOPI~ .! DR 21 PIP.I: . 2+00 .-~:~--:-~--T-T 2+50 3+00 PROFILE BRINE LINE SCALE; HORIZ; 1"= 10" VEIU; 1"= !i" I-'. . . I T ~ ... -h-j • · · 000~ 3+50 3+80 8'I> CONSlRUCTION ~ 25 li th 20 ~u h-HI en P-c:, 1§ z H ! i~j ji t 1! E .!.Q C l.::, C Sj 0:: t)i 0111 C.) .11 S § w !p o:: ., I' f ~ -e o,. ~,i,1 _Q Jh! ., !! § II Uit ~ -10 ITEMPLAN CHANGESDESCRIPTIONDATEBYKiewit - Shea II, A Joint Venture10704 Shoemaker Ave.Santa Fe Springs, CA 90670DATE: Compaction ReportCarlsbad Desalination Plant Seawater Intake Modification4600 Carlsbad Blvd.Carlsbad, CA 9200832 OF 2December, 2020 LEGEND BASE MAP PROVIDED BY:Tetra TechRANCHO CUCAMONGA, CA 91730909.989.1751 · FAX 909.989.4287GEOTECHNICAL ENGINEERING CONSTRUCTION INSPECTION MATERIALS TESTING12130 SANTA MARGARITA COURTwww.rmacompanies.comDRAWN BY:JPFIGURE NO.:SHEET NO.:RMA JOB NO.:19-2285-0-Test Location9125116SCALE: 1" = 160'lo' -"' \ \ ~\ ~ \ V RMA Group w:rrPrrti«IM tte wwwrmocomp(J'n•r.-com ..,, •• ,..,11vr, PUMP STATION TEMPORARY SECURITY FENCE; SEENOTE4 \ ' \