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11.8± a Apn's 212-110-01, -02, -03, -04 UPDATED GEOTECHNICAL EVALUATION FOR WEST OAKS PROJECT – 11.8± ACRE SITE APN’S 212-110-01, -02, -03, -04, -05, -06, -07, -08 AND 212-040-26 CITY OF CARLSBAD, SAN DIEGO COUNTY, CALIFORNIA PREPARED FOR INTEGRAL COMMUNITIES 2235 ENCINITAS BOULEVARD, SUITE 216 ENCINITAS, CALIFORNIA 92024 PREPARED BY GEOTEK, INC. 1548 NORTH MAPLE STREET CORONA, CALIFORNIA 92880 PROJECT NO. 0934-CR3 JULY 28, 2017 July 28, 2017 Project No. 0934-CR3 Integral Communities 2235 Encinitas Boulevard, Suite 216 Encinitas, California 92024 Attention: Mr. Greg Waite Subject: Updated Geotechnical Evaluation West Oaks Project – 7.5± Acre Site Assessor Parcel Numbers (APN) 212-110-01, -02, -03, -04, -05, -06, -07, -08 and 212-040-26 City of Carlsbad, San Diego County, California Dear Mr. Waite: We are pleased to provide the results of our updated geotechnical evaluation for the subject site located in the City of Carlsbad, County of San Diego, California. This report was prepared in response to the City of Carlsbad 2 nd Review Comments (June 8, 2017), and presents a discussion of our evaluation and provides preliminary geotechnical recommendations for earthwork, foundation design, and construction. In our opinion, site development appears feasible from a geotechnical viewpoint provided that the recommendations included herein are incorporated into the design and construction phases of site development. The opportunity to be of service is sincerely appreciated. If you should have any questions, please do not hesitate to call our office. Respectfully submitted, GeoTek, Inc. Edward H. LaMont Noelle C. Toney CEG 1892, Exp. 07/31/18 PE 84700, Exp. 03/31/18 Principal Geologist Project Engineer Distribution: (1) Addressee G:\Projects\0901 to 0950\0934CR3 Integral Comm., West Oaks, Carlsbad\Geo\0934CR3 Updated Geotechnical Evaluation_07-28-17.docx GEOTECHNICAL | ENVIRONMENTAL | MATERIALS Integral Communities Project No. 0934-CR3 Updated Geotechnical Evaluation July 28, 2017 West Oaks Project, City of Carlsbad, California Page i TABLE OF CONTENTS 1. PURPOSE AND SCOPE OF SERVICES...................................................................................................... 1 2. SITE DESCRIPTION AND PROPOSED DEVELOPMENT .................................................................... 1 2.1 SITE DESCRIPTION ......................................................................................................................................... 1 2.2 SITE BACKGROUND ....................................................................................................................................... 2 2.3 PROPOSED DEVELOPMENT............................................................................................................................. 3 3. FIELD EXPLORATION AND LABORATORY TESTING ...................................................................... 4 3.1 FIELD EXPLORATION ..................................................................................................................................... 4 3.2 LABORATORY TESTING ................................................................................................................................. 4 4. GEOLOGIC AND SOILS CONDITIONS.................................................................................................... 4 4.1 REGIONAL SETTING ....................................................................................................................................... 4 4.2 GENERAL SOIL/GEOLOGIC CONDITIONS ........................................................................................................ 5 4.2.1 Fill Soils................................................................................................................................................. 5 4.2.2 Alluvium................................................................................................................................................ 5 4.2.3 Bedrock ................................................................................................................................................ 6 4.3 SURFACE AND GROUNDWATER...................................................................................................................... 6 4.3.1 Surface Water....................................................................................................................................... 6 4.3.2 Groundwater ......................................................................................................................................... 6 4.4 FAULTING AND SEISMICITY ........................................................................................................................... 6 4.4.1 Seismic Design Parameters .................................................................................................................... 7 4.5 LIQUEFACTION AND SEISMICALLY INDUCED SETTLEMENT ........................................................................... 7 4.6 OTHER SEISMIC HAZARDS............................................................................................................................. 8 5. CONCLUSIONS AND RECOMMENDATIONS ....................................................................................... 9 5.1 GENERAL....................................................................................................................................................... 9 5.2 EARTHWORK CONSIDERATIONS..................................................................................................................... 9 5.2.1 Site Clearing and Preparation................................................................................................................. 9 5.2.2 Removals .............................................................................................................................................. 9 5.2.3 Fills ..................................................................................................................................................... 10 5.2.5 Shrinkage and Subsidence.................................................................................................................... 10 5.2.6 Trench Excavations and Backfill ........................................................................................................... 11 5.3 DESIGN RECOMMENDATIONS ...................................................................................................................... 11 5.3.1 Foundation Design Criteria ................................................................................................................... 11 5.3.2 Soil Corrosivity ..................................................................................................................................... 15 5.3.3 Soil Sulfate Content ............................................................................................................................. 16 5.3.4 Import Soils......................................................................................................................................... 16 5.3.5 Preliminary Pavement Design ............................................................................................................... 16 5.3.6 Concrete Flatwork ............................................................................................................................... 17 5.4 POST CONSTRUCTION CONSIDERATIONS ..................................................................................................... 19 5.4.1 Landscape Maintenance and Planting................................................................................................... 19 5.4.2 Drainage............................................................................................................................................. 19 5.5 PLAN REVIEW AND CONSTRUCTION OBSERVATIONS................................................................................... 20 6. INTENT............................................................................................................................................................. 20 Integral Communities Project No. 0934-CR3 Updated Geotechnical Evaluation July 28, 2017 West Oaks Project, City of Carlsbad, California Page ii TABLE OF CONTENTS 7. LIMITATIONS ................................................................................................................................................. 21 8. SELECTED REFERENCES............................................................................................................................ 21 ENCLOSURES Figure 1 – Site Location Map Figure 2 – General Site Topography Map Figure 3 – Exploratory Excavation Location Map Appendix A – Excavation Logs Appendix B – Laboratory Test Results Appendix C – Liquefaction Analyses Appendix D – General Grading Guidelines Integral Communities Project No. 0934-CR3 Updated Geotechnical Evaluation July 28, 2017 West Oaks Project, City of Carlsbad, California Page 1 1. PURPOSE AND SCOPE OF SERVICES The purpose of this study was to complete an updated evaluation of the existing geotechnical conditions of the project site in general. Services provided for this study included the following: . Research and review of available geologic/geotechnical data and general information pertinent to the site, . Site reconnaissance, . Review of four exploratory hollow-stem auger borings and eight exploratory trenches on-site, . Collection of a bulk soil sample of the on-site materials
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