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Home My WebLink AboutCT 04-26; ROBERTSON RANCH EAST VILLAGE PA 16, 17, & 18; COMPACTION REPORT OF BUILDING PAD RE-CERTIFICATION PHASE 10; 2012-01-23CT 04-2(o ddVP IC. Geotechnucal. Geologic. Coastal • Environmental - - 5741 Palmer Way • Carlsbad, California 92010. (760)438-3155 • FAX (760)931-0915 January 23, 2012... - * . . .' - W.O. 5949-B-SC Brookfield Homes 12865 Pointe Del Mar, Suite 200 . Del Mar, California 920.14 Attention Ms Teri McHugh and Mr. Greg McDonnell Subject: Compaction Report of Building Pad Re-Certification, Portion of Phase 10, Lots 95 and 99, Planning Area 16, Robertson Ranch Development, Carlsbad, San Diego County, California. • . . . . References: 1. "Supplemental Discussion of Slab Subgrade Pre-Wetting, Planning Area 16 of Robertson - Ranch, City of Carlsbad, California," W.O. 5949:C-SC, dated August 17, 2010, by GeoSoils, Inc. ,. 2. "Discussion of Building Slab SubradePre-Wetting, Planning Area 16 of Robertson Ranch, City of,Carlsbad, California," -W.O. 5949-C-SC-dated October 8, 2009, by . GeoSoils, Inc. . . - 3. "Report of Rough Grading, Planning Area 16 of Robertson Ranch, East Village (Lots 44 - Through 63,89 Through 99,117 Through 140, and 160 Through 189), Carlsbad Tract 04-26, - Drawing 453-8A, Carlsbad, San Diego County, California," W.O. 5353-131-SC, dated . . February 16, 2009, by GeoSoils, Inc. Dear Ms. McHugh and Mr. McDonnell:. GeoSoils, Inc. (GSl) is providing this summary of our observation and testing services -. during mitigative grading within Phase 10, Lots 95 and 99 of Planning ,Area 16, at' Robertson Ranch, East Village Subdivision in the City of Carlsbad, California. The pupose of remedial grading was to reprocess the subject lots -in accordance with recommendations presented in Reference No. 2.. For highly expansive Lot 99, earthwork - consisted of removing the upper 12 inches of existing fill soil across the lot. For very highly expansive Lot 95, earthwork consisted of removing the upper 18 inches of existing fill soil across the lot. Once removals were completed, the exposed bottoms were processed, * moisture conditioned and compacted to a depth of 12 additional inches, then brought to grade with compacted fill, such that the upper 24 inches (highly expansive lots), and upper 30 inches (very highly expansive lots) has been reprocessed. Where tested, reprocessed - - - and/or fill material was compacted to at least 90 percent relative compaction, at 4 percent * to 5 percent above the soils optimum moisture content per ASTM D 1557 (see Reference No. 2). Based on our observations and testing, the building pads appear to have been prepared in general accordance with the recommendations provided by this office (see Reference No. 2 and No. 3), and are considered suitable for, development from a geotechnical standpoint. Field Observation and Testing Field density tests were performed using nuclear (densometer) ASTM test method D 6938 (Procedure A) The test results taken during grading operations are presented in the attached copies of our "Field Testing Reports" The laboratory maximum dry density and optimum moisture content for the major soil type js within this construction phase were determined in general accordance with test method ASTM D 15$7 The following table presents the results SOIL TYPE MAXIMUM DENSITY (PCF) MOISTURE CONTENT (PERCENT) B Dark Brown Ciayey SAND/Sandy CLAY 14 .9, 13.0 C - Gray Brown Clayey SAND, 120.5 13.0. Field compaction testing indicates that the soils appear to meet the minimum compaction requirements previously established and adopted by the City, of Carlsbad (i.e., at least 90 percent relative compaction per ASTM D 1557), and recent tests indicate over optimum soil moisture content, per GSI's reports (Reference No. 1 and 2). Should a significant (i.e., three to seven days) period of time pass prior to slab construction, additional moisture conditioning and/or re-establishing consistency, as well as pad subgrade proof testing may be necessary, prior to placement of the underslab vapor retarder (see Reference No 2 and No. 3) .. Foundation Design/Construction Unless specifically superceded herein, the findings, cdnclusions, and recommendations presented in Reference No. 3, are generally considered valid and applicable with respect to the construction and development of the subject building pads. Based on our review of Reference No. 3, Lot 95 is categorized as foundation Category IVPT, and Lot 99 is categorized as foundation Category IlIPT. If building code updates are adopted prior to the development of these pads, an additional geotechnical update report may be necessary. Plan Review Final project plans (foundation, retaining wall, landscape, etc.) should be reviewed by this office prior to construction, so that construction is in accordance with the conclusions and Bróokfield Homes . . . .W.O. 59496-SC PA-1 6 Phase 10 (Lots 95/99) Robertson Ranch January 23 2013 File e \wpl2\5900\5949b phlo 9599 cr0 GeOSolls, Inc. Page 2 recommendations of this report. Based on our review, supplemental recommendations and/or further geotechnical evaluations may be warranted. Closure The materials encountered on the project site and utilized for our analysis are believed representative of the area; however, soil and bedrock materials vary in character between excavations and natural outcrops or conditions exposed during mass grading. Site conditions may vary due to seasonal changes or other factors. Inasmuch as our study is based upon our review and engineering analyses and laboratory data, the conclusions and recommendations are professional opinions. These opinions have been derived in accordance with current standards of practice, and no warranty, either express or implied, is given. Standards of practice are subject to change with time. GSI assumes no responsibility or liability for work or testing performed by others, or their inaction; or work performed when GSI is not requested to be onsite, to evaluate if our recommendations have been properly implemented. Use of this report constitutes an agreement and consent by the user to all the limitations outlined above, notwithstanding any other agreements that may be in place. In addition, this report may be subject to review by the controlling authorities. Thus, this report brings to completion our scope of services for this portion of the project. The opportunity to be of service is sincerely appreciated. If you should have any questions, please do. not hesitate to contact our office. Respectfully GeoSoils, Inc. C & Geologist rL Cr 0.1934 Cerdfied Ergineering Robert G. Crisman David W. Skell Engineering Geologi Civil Engineer, RCG/DWS/JPF/jh Attachment: "Field Testing Reports" Distribution: (1) Addressee (via mail and email) (..s I to. BCE 47357 Exp.124J._) * Brookfield Homes W.O. 5949-BSC PA-16, Phase 10 (Lots 95/99), Robertson Ranch January 23, 2013 FiIe:e:\wpl2\5900\5949b.phlo.95.99.cro GeoSoils, Inc. Page 3 FIELD TESTING REPORT DATE____________ NAME (. HOURS 2) - CLIENT _____________________TRACT_1PIJ LOCATION _ci f1_8Ai) SUPT EQUIPMENT 12iJiJ —cr.'c iF ELEV. MOISTURE DRY % RELATIVE COMPACTION MMI VMF COMMENTS: PAGE _______ OFf This field report presents a summary of observations and testing by Geosoils, Inc. personnel only where the tests were performed. Our work does not include supervision or direction of the actual work of the contractor, his employees, or agents. The Contractor should be informed that neither the presence of our field representative, nor the observation and testing by our firm, shall excuse him in any way for defects discovered in his work. It is understood that our firm will not be responsible for job or site safety on this project. ME FIELD TESTING REPORT - DATE /-22./3 NAME ,. _,5k1 HOURS !_.. CLIENT ,,L //7 —TRACT _ 7'C LOCATION CAr /1h/ SUPT. _"7. CONTRACTOR C, / EQUIPMENT TEST NO. LOCATION ELEV. OR DEPTH MOISTURE CONTENT % DRY DENSITY P.C.F. % RELATIVE COMPACTION TEST TYPE SOIL TYPE //X ___ 1 A r t /1 A _ O _i COMMENTS: c;'_ c; / rj jO-i5-O GeoSoils Inc. BY: PAGE ________ OF / This field report presents a summary of observations and testing by Geosoils, Inc. personnel only where the tests were performed. Our work does not include supervision or direction of the actual work of the contractor, his employees, or agents. The Contractor should be informed that neither the presence of our field representative, nor the observation and testing by our firm, shall excuse him in any way for defects discovered in his work. It is understood that our firm will not be responsible for job or site safety on this project. FIELD TESTING REPORT w.O.______ DATE /23-13 NAME HOURS Lor. CLIENT ')4;bA h-2 TRACT PA-1 12 LOCATION____________________ SUPT. CONTRACTOR CAI EQUIPMENT _54 _1aZP 1 dor..e.i-, TEST NO. LOCATION ELEV. OR DEPTH MOISTURE CONTENT % DRY DENSITY P.C.F. % RELATIVE COMPACTION TEST TYPE SOIL TYPE 7/ 1q4/ hr r I r/ ,/ 92-L 1v> i? 72- ,4 / Zr FG. / /tZ7 9119.J 73 ,'? / hr 97 FG i5 io86 949,1 4 . .4 flrnia1 COMMENTS: /.4-3,d?171a-J 44 /O af GeoSoils Inc01 BY: PAGE ______'-OF OF_K This field report presents a summary of observations and testing by Geosoils, Inc. personnel only where the tests were performed. Our work does not include supervision or direction of the actual work of the contractor, his employees, or agents. The Contractor should be informed that neither the presence of our field representative, nor the observation and testing by our firm, shall excuse him in any way for defects discovered in his work. It is understood that our firm will not be responsible for job or site safety on this project. CONSULTA NTS Civil Engineering Surveying January 25, 2013 J.N. 081245 City of Carlsbad Building Inspector 5950 El Camino Real Carlsbad, CA 92008 RE Foothills (Robertson Ranch) CT 04-26, PA 16 Lots 95 and 99 of Map 15682 Dear Building Inspector Based upon a topographic survey performed by O'Day Consultants on January 24,':2013. the rough grading for land development has been completed within standard tolerance (0 10 feet) in accordance with the approved plans (Dwg No 453-8C) and that all embankments, cut slopes and pad sizing are as shown on the approved plans We request the release of pads for building permits for lots 95 and 99. Very truly yours, - O'DAY CONSULTANTS, INC. George O'Day Project Manager 0:\ProjectManagers\transmc\08 1245PCPA16ph 15-2.doc O'Day Consultants Inc. E-mail: oday@odayconsultants.com 2710 Loker Avenue West, Suite 100 Website: www.odayconsultants.com Carlsbad, California 92010-6609 Tel: 760.931.7700 Fax' 760.931.8680 \\ MAP NO. 15508 LOT 10 — — - 0p PEAKS ST. cnPKAW LOT 9 - '- — LOT LOTI / LOTS LOT -- - 0' 400' GO SCALE: 1" = 400' NO. 32014 THE FOOTHILLS AT CARLSBAD ROBERTSON RANCH PA 16 POR._OF PHASE _15_ LOTS _95_&_99 CITY OF CARLSBAD DATE: JAN. 25, 2013 APPLICANT: SHT 1 OF 3 SHTS CONS ________________ S BROOKF/ELD HOMES, LC PREPARED BY: 2710 Laker Avenue West 12865 PO/ DEL /tl,4R .':ct- (j7 1/ C. i: 04-26 Suite 100 SUITE 200 Carlsbad, California 92010 760-931-7700 DEL MAR, CA 92014 CEORCE(30'DAY 4' / , P11.0. 06-0124- Fax: 760-931-8680 (858) 481-8500 RCE32O14 EXP. I/J1/14 OWO. NO. 453-8C 1\U11U14\0114MM—H la- A.dwg Jan J, JU1J 10: 1am Xrafn: Oh14UAP flhI400AP 25~ VP 195\ I9) PAD =83./ I f) 17=83.77 r _4bPVC t91XMIN —L—so' IlIIL: J;j J 122 I 121 L___J I 33.16' 1290' f .X941 0' 20' 4-100, 10' ? 5 0' SCALE: 1" = 20' CF=83 1 Fri .00 -50 NO. 32014)On J 4apvc(T rn V ssio i\ 824i''? 822T0 / 81.4 a I J-EX/ T7" / CPST0Rhf DA7N z)-016 ONT'E 70E/5fJ0-27 433-6 WEDVCER (np) 81 - ___ - TJFIDER DRAIN PER VWO. THE FOOTHILLS tEN A Vi OP 1i AT CARLSBAD ROBERTSON RANCH PA 16 PHASE 15 LOT 95 I L 94 OJZ~ CITY OF CARLSBAD DATE: JAN. 25, 2013 APPLICANT: CONS BROOKF/ELO HOMES, LLC PREPARED BY: SHT 2 OF 3 SHTS 2710 Laker Avenue West 12865 PO//YTE DEL MAR CT 04-26 Suite 100 SUliE 200 , / P.(J.D. 06-012,4 Carlsbad, California 92010 760-931-7700 DLLUARj CA 92014 CE0R'E ODA Fax: 760-931-8680 (41-8500 RCE 32014, EX/ 12/31/14 DWC. NO. 453-8C —LU ion Tr" :140m Xrefn OU4èMAP 0114.,ntr Ohl4nft 01I4,r,,r,n Oil 4UUflI 0114M11T1 flhl4ROTP 0114RlI11 —.l 9' 4 84.6 8J1 L/78 I 117 1 I 62.56' / P, —iaJ' 1 ZB50 fI I 40 PVC 0 IX MIN - PAD=85.4 FF=86.07 II 6'F=85. 4 84. TG O7AC I—, 0' 20' HI I 10' SCALE: 1" = 20' I I IfL 174' iVLJH It I ii s I I,I I NA _ - RW TING 4" REC. 7WAR 1.007. GLEN 14VE. NO. 32014 Arl 7LVC 36" RCP STORM DRAI - THE FOOTHILLS AT CARLOAD ROBERTSON RANCH PA 16 PHASE 15 LOT 99 OZA* 2 CITY OF CARLSBAD DATE: JAN. 25, 2013 APPLICANT: BROOKF/ELD HO4'fES LLC 12865 POINTE DEL MAR PREPARED BY: SHT 3 OF 3 SHTS 0 N S U L I _C 2710 Laker Avenue West c.i: 04-26 Suite 100 Carlsbad, California 92010 SUITE 200 P.1J.D. 06-0124 - CEO/(CE 0;9A yf / 760-931-7700 Fax: 760-931-8680 DEL IWAR, CA 92014 (858) 481-8500 RCE 32014, EXP.12/31/14 OWO. NO. 453-80 U14\U114MMI--IHl—LUI.ciwg ion . U1i D114 MAP; 0114gstr; OU4utI: O114mo; 01144MDL: —cm:<refs: 0I14MUTL: 01148S1R: 0114BUTh