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Home My WebLink AboutCDP 16-29; LINCOLN RESIDENCE; REVIEW OF GEOTECHINCIAL REPORT; 2018-10-10 (2)NV5 City of Carlsbad 1635 Faraday Avenue Carlsbad, California 92008 Attention: Mr. David Rick. P.E. Subject: Review of Geotechnical Report Project: Proposed Single-Family Residence 5198 Shore Drive Carlsbad, California City Project: CDP16-29 PAS October 10, 2018 Project No.: 226816-00101.41 References: 1) "Geotechnical Investigation, Proposed Single-Family Residence, 5198 Shore Drive, Carlsbad, California". prepared by Hetherington Engineering, Inc., Project No. 8081.1, datedNovember 14, 2016. 2) "Technical Guidelines for Geotechnical Reports ' issued by the City of Carlsbad, dated January 1993. Dear Mr. Rick: As requested, NV5, West Inc. (NV5) has conducted a geotechnical review of the above-referenced geotechnical report for the proposed single-family residential project located at 5198 Shore Drive in Carlsbad, California. The purpose of the review was to provide an opinion on whether the geotechnical aspects of the project have been identified and appropriately addressed in the project geotechnical report. Our geotechnical review is based on geotechnical information presented in the referenced geotechnical report and our experience with the geotechnical conditions in the general site area. NV5 has not performed an independent geotechnical investigation at the project site and therefore does not offer or imply any guarantee or warranty as to future site performance. The opinions presented below are limited. Other consultants could arrive at different conclusions. This report presents a summary of the review. Review Summary Based on our review, the referenced geotechnical report for the proposed project has generally identified and addressed most of the significant geotechnical factors affecting the site development as currently proposed, and the report is approved. Note that acceptance or approval of the reports do not guarantee or constitute approval for grading or building permits. OFFICES lIAT1014WICjC 15092 AVENUE OF SCIENCE, SUITE 200 1 SAN DIEGO. CA 92 128 1 WWW.NV5.COM I OFFICE 858.3850500 1 FAX 858.3850400 Capstucnol4 Qu*ury A4RA$CE - INrMATivCTVIE - CNEGS - PROGRAM MA$aGEM!MT - VIIO$MLMtM. Review of Geotechnical Report Proposed Single-Family Residence 5198 Shore Drive Carlsbad, California Project No.: 226816-00101.41 p NV5 appreciates the opportunity to be of service to you on this project. If you have any questions regarding this report, please do not hesitate to contact our office. Respectfully submitted, NV5 West, Inc. Gene Custenborder, CEG 1319 ,-' Senior Engineering Geologist EA .it.. I I 1* I EHCI' EEIW / Attachment: Geotcchnical Grading Checklist ...,(' ' GC/CH:ma Carl Henderson, PhD, GE 2886 CQA Group Director (San Diego) oFESSi co OFCA Distribution: (1) Addressee, via email N1Y15 OFFICE'UATCtIWIOE CON UctON OUAUn AS,U$*NCE INcR*stRueURE ENGINEEflWo Muuicppat. OuTsouRciso Assrr Ma.sacsrjr ENVIIONMENT&t SERVICES I GEOTECHNICAL REPORT REVIEW CHECKLIST I Plan Check Number: CDP16 -29 PAS Location I Address: 5198 Shore Dr., Carlsbad City Plan Checker: Date: 10/10/2018 GEOTECHNICAL REPORT - GENERAL OK NOT MET N/A Signed by RCEIGE 1 0 0 Signed by CEG (Required for Hillside Area) 1 0 0 Project Address 1 0 0 Location Index Map with reference north, scale, etc. / 0 0 Site Description (topography, vegetation, existing structures/improvements, drainage) 0 0 Description of Proposed Development (grading, structures/improvements, drainage, use, foundation type, estimated structural loads) GEOTECHNICAL REPORT - FIELD INVESTIGATION OK NOT MET NIA Site Specific Subsurface Investigation 1 0 0 Description of Investigative and Sampling Methods 0 0 Boring/Test Pit Logs (Soil/Bedrock descriptions with depth, type and depth indicated for sampling, real or assumed elevation indicated, groundwater conditions) C1 13 Sampling performed to anticipated depth of foundations and/or deepest excavation is 0 0 Boring/Test Pits located on Geotechnical Map/Plot Plan 0 0 Revised 5/10/2018 1. o 7 GEOTECHNICAL REPORT - LAB TESTING OK NOT MET N/A Description of lab test performed with referenced test method (ASTM, EPA, etc) / 0 0 Soil Strength (Shear) 1 0 0 Expansion I 0 0 Sulfate 0 0 Gradation 0 0 1 / Classification of soil in accordance with ASTM 0 2487 (when using California Building Code values for lateral load) o - o gi Moisture/Density / LI 0 Consolidation 0 0 Atterberg Limits 0 0 J Maximum Dry Density/Optimum Moisture Content 0 0 GEOTECHNICAL REPORT —EARTH MATERIALS OK NOT MET NIA Description and designation of geologic units (surficial soils and bedrock, including depth, thickness) 0 0 Geologic structure (bedding, fracturing, faulting of bedrock material) / 0 0 Description of regional geologic conditions (including reported regional trends of bedding and faulting) - o o GEOTECHNICAL REPORT - SEISMICITY OK NOT MET N/A General description of regional and local faulting IN 0 0 Site Class 0 0 Mapped Spectral Acceleration Parameters (Ss, Si) I 0 0 Site Coefficients (Fa, Fv) / 0 0 Design Spectral Acceleration Parameters (Sos, SDI) 0 0 ceotechrucal Report Checklist Revised 5i014 F Geotechnic/el Report Checklist Rvi3d )2fl9 Page 3 f 7 Seismic Design Category / ° I ° GEOTECHNICAL REPORT - GEOLOGIC HAZARDS OW NOT MET Landslide / 0 0 Expansive Soils / 0 0 Surficial Slope Instability 0 0 Slope Creep Groundwater Total and Differential Settlement 1 0 0 Sulfate of 0 Cl Liquefaction 1 0 0 Affect of liquefiable soils on utilities and lifeline services outside of structural mitigation 0 0 Seismic Induced Landsliding 0 D Tsunami Potential 0 0 GEOTECHNICAL REPORT ILLUSTRATIONS OK NOT NIA MET Geotechnical Map I Plot Plan / 0 0 Existing topography I improvements ii 0 0 Proposed topography I improvements 1 0 0 Location of subsurface exploration (borings, test pits, etc.) 0 0 Geologic Contacts 0 0 Geologic Structure Location of fill key I buttress 0 0 Geologic Cross-Section 0 0 Existing topography I improvements 0 0 / Proposed topography I improvements 0 0 Location of subsurface exploration (borings, test pits, etc.) 0 0 Geologic Contacts 0 0 Geologic Structure 0 0 Slope setbacks Temporary cuts I shoring 0 0 Fill Key / buttress 0 0 Slope benching GEOTECHNICAL REPORT - CONCLUSIONS I RECOMMENDATIONS OK NOT MET N/A Statement as to feasibility of project 0 0 Statement as to impact on adjacent properties 0 0 Statement of the condition of slopes with respect to stability 0 0 1 Slope stability analysis provided to support conclusion/recommendations 0 0 / Statement regarding liquefaction potential W 0 El Liquefaction analysis provided to support conclusion/recommedations 0 0 1 Grading Recommendations 1 o o Remedial grading 0 0 am Compaction standards o o Groundwater Mitigation Temporary excavation (backcuts, slopes) with time limit recommendations @I 0 0 Shoring Benching Keys I buttresses 0 0 1 Canyon/Key Subdrains 0 o / Foundation Recommendations Geotochflca1 Report Checklist Revised 5/0/2018 Pij 4 f 'i Expansive soil mitigation (CBC 1805) I 0 0 Description of approved embedment material (i.e. compacted fill, terrace deposits, etc) 0 0 Minimum depth of embedment (into approved material) for foundations / 0 0 Minimum width of footings 0 0 Minimum diameter of caissons 0 0 / Bearing capacity (end bearing for caissons) 0 0 Coefficient of friction (caisson skin fricon) 0 0 / Lateral bearing , , 0 0 Down drag forces (liquefiable soils,) Lateral Spread forces (liquefiable soils) 0 0 / Foundation slope/trench setback or 0 0 Minimum reinforcement requirements / 0 0 Minimum slab thickness and reinforcement . / 0 0 Slab underlayment 1 0 0 Soluable Sulfate exposure migation (typically cement type) / 0 0 Conventional Retaining Wall Recommendations / 0 0 Active pressures (level, sloping) tF 0 0 Retaining wall backdrain or recommendation of additional hydrostatic pressure / 0 0 Backfill 1 0 0 Surcharges J 0 0 MSE Wall Recommendations (facing material, grid, backfill, stability analysis) 0 0 Flatwork I Hardscape recommendations including driveways (subgrade preparation, minimum slab thickness, reinforcement and joint spacing) - Roadway Pavement recommendations (section design, subgrade preparathn) 0 0 Swimming Pool recommendations 0 Cl GEOTECHNICAL REPORT - OBSERVATIONITESTING DURING CONSTRUCTION Geotechnical. Report Checklist Revised 5/10/20t3 voge 5 ot 7 0 NOT MET NIA Footing Excavations 0 0 / Subdrains 0 0 Caisson I Drilled Pier excavations (CBC Table 1704.9) 0 0 Pool Excavations 0 0 Benching 0 0 Keyways 0 0 J Temporary excavations 0 0 Geologic mapping of bedrock excavations Retaining wall backfill 0 0 Utility trench backfill 0 0 / Engineered fill 0 0 / Hardscape subgrade (driveways, patios, walkways, etc.) 0 0 / Import soils 0 0 / GEOTECHNICAL REPORT REFERENCES OK NOT MET NIA Current! City adopted Building Code 0 0 / Grading Code 0 0 / Geotechnical reports I publications /geologic maps / 0 0 Ariel photographs 0 0 ( Websites / 0 0 GEOTECHNICAL REPORT - COASTAL BLUFF OK NOT MET NIA Top of bluff designation (presented on geologic map and cross-sections) 0 0. Wf] Geotechnical Report Checklist R...vi.sed :/1)lPJLa Pip f 7 Anal photograph of site showing top of bluff 0 0 Bluff retreat rate and total estimated retreat for a,50 year period 0 0 / Codified Bluff top setback (presented on geologic map and cross-sections) 0 0 Slope stability analysis References for bluff retreat rate 0 0 Slope Stability Setback presented on geologic map (surface expression of 1.5 FS) 0 0 / Total Setback presented on geologic map (greater of A: Slope Stability Setback + 50 yr bluff retreat or B: 10-feet buffer + 50 yr bluff retreat) o o Explanation and justification of 40-feet setback deviation 0 0 Gootachnical Report Chackitat Revised /112018 Page 7 of 7