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Home My WebLink AboutCDP 2020-0001; PATEL RESIDENCE; THIRD-PARTY GEOTECHNICAL REIVEW (SECOND); 2020-12-08HETHERINGTON ENGINEERING, INC. SOIL & FOUNDATION ENGINEERING • ENGINEERING GEOLOGY• HYDROGEOLOGY City of Carlsbad Land Development Engineering 1635 Faraday Avenue Carlsbad, California 92008-7314 Attention: Mr. David Rick Subject: TIDRD-PARTY GEOTECHNICAL REVIEW (SECOND) Proposed Single-Family Residence Carlsbad Boulevard Carlsbad, California Project ID: CDP 2020-0001 References: Attached Dear Mr. Rick: December 8, 2020 Project No. 9221.1 Log No. 21237 In accordance with your request, Hetherington Engineering, Inc. has provided third-party geotechnical review of Reference 4. The following comment is provided for analyses and/or response by the Geotechnical Consultant. GEOTECHNICAL REVIEW COMMENT: The Consultant should respond to the comments presented in the "Third-Party Geotechnical Review (First) ... "Tire (Reference 3). This review is attached for convenience. The opportunity to be of service is sincerely appreciated. If you have any questions regarding this review, please contact this office. Sincerely, HETHERINGTON ENGINEERING, INC. Mark D. Hetherington Civil Engineer 30488 Geotechnical Engine , .... ....,----, ( expires 3/31/22) -~ ........ ,. Paul A. Bogseth Professional Geologist 3772 Certified Engineering Geologis Certified Hydrogeologist 591 ( expires 3/31/22) Attachment: " ird-Party Geotechnical Review (First) ... ", dated Nove Distribution: I-via e-mail (David.Rick@carlsbadca.gov) 1-via e-mail (Elissa.Tovar@carlsbadca.gov) 5365 Avenida Encinas, Suite A• Carlsbad, CA 92008-4369 • (760) 931-1917 • Fax (760) 931-0545 333 Third Stree • Laguna Beach, CA 9265 • (949) 715-5440 • Fax (949) 715-5442 www.hetheringtonengineering.com REFERENCES l. "Limited Geotechnical Investigation, Proposed Single-Family Residence (Patel Residence), Carlsbad Boulevard, APN 210-115-08, City of Carlsbad, California 92008", by East County Soil Consultation and Engineering, Inc., dated August 9, 2019. 2. "Grading Plans For: Patel Residence -Terramar, Carlsbad Boulevard", by bHA, Inc., dated September 16, 2020 (Sheets 1 through 5). 3. "Third-Party Geotechnical Review (First), Proposed Single-Family Residence, Carlsbad Boulevard, Carlsbad, California, Project ID: CDP2020-0001 ", by Hetherington Engineering, Inc., dated November 9, 2020. 4. "Review of Grading Plans and Supplemental Geotechnical Recommendations, Proposed Single-Family Residence, 5462 Carlsbad Boulevard, Carlsbad, California 92008", by East County Soil Consultation and Engineering, Inc., dated November 11 , 2020. 5. "Grading Plans For: Patel Residence -Terramar, Carlsbad Boulevard", by bHA, Inc., dated December 1, 2020 (Sheets 1 through 7). HETHERINGTON ENGINEERING, INC. Project No. 922 1.1 Log No. 21237 , I .,. f ! HETHERINGTON ENGINEERING, IN C. SOIL & FOUNDATION ENGINEERING • ENGINEERING GEOLOGY• HYDROGEOLOGY November 9, 2020 Project No. 922 1.1 Log No. 2 1 16 1 City of Ca rlsbad Land Development Engineeri11g 163 5 Faraday Avenu e Carlsbad California 92008-73 14 Attention : Subject: References: Mr. David Rick THIRD-PARTY GEOTECHNlCAL REVfEW (FIRST) Proposed Singlc-Fa_mily Residence Carlsbad Boulevard Carlsbad, California Project ID: CDP 2020-000 I I. "Limited Geotechn.ical Investigation, Proposed Single-Family Residence (Patel Residence), Carlsbad Boulevard, APN 210-115-08, City of Carlsbad, California 92008'', by East County Soil Consultation and Engineering, Inc., dated August 9, 2019. 2. "Oracling Plans For: Patel Residence -Terramar, Carlsbad Boulevard", by bHA, Inc., dated September J 6, 2020 (Sheets I through 5). Dear Mr. Rick: ln accordance with your request Hetherington Engineering, Inc. has provided third-party geotechnical review of Reference I . The following comments are provided for analyses and/or response by the Geotechnical Consultant. GEOTECHNICAL REVIEW COMMENTS: 1. The Consultant should provide a Location Map for the site with reference north, scale, etc. 2. The Consultant should provide a geotecbnical update addressing the grading plans, and provide updated grading and foundation recomm_endations and seismic design criteria consistent with the 2019 California Building Code and ASCE 7-16, as necessary. 3. The Consultant should review the project grading, foundation and shoring plans, provide any additional geotechnical recommendations considered necessary, and confirm that the plans have been prepared in accordance with the geotechnical recommendations provided in the geotechnical report. 5365 Avenida Encinas, Suite A• Carlsbad, CA 92008-4369 • (760) 931-1917 • Fax (760) 931-0545 333 Third Stree • Laguna Beach, CA 9265 • (949) 715-5440 • Fax (949) 715-5442 www.hetheringtonengineering.com THIRD-PARTY GEOTECHNlCAL REVIEW (FIRST) Project No. 9221.l LogNo.2 1161 November 9, 2020 Page2 4. The Consultant should provide an updated geotechnical map/plot plan utilizing the latest grading plan for tb e project to cleaf'ly show (at a minimum) a) existing site topography, b) proposed structures/improvements, c) proposed finished grades, d) locations of the subsurface exploration, e) geologic contacts, and t) remedial grading limits, etc. 5. The Consultant should provide geologic cross-sections utilizing the current grading plan to clearly show (at a minimum) a) existirtg site topography, b) proposed structures/improvements, c) proposed finished grades, d) geologic contacts, e}geologic stnlcture, f) locations of the subsurface ex,ploration, g) temporary construction slopes, and h) remedial grading, etc. 6. The Const1ltant should provide a statement regarding the impact of the proposed grading and construction on adjacent properties and improvements. 7. The Consultant should provide remedial grading recommendations for proposed driveway/hardscape areas. 8. The Const1ltant should provide bardscape recommendations (thickness, reinforcement, jo.ints, etc.). 9. The Consultant should specify an allowable passive pressure for the foundations in accordance with the presumptive values provided in Secti9n l 806.2 of the 2Q 19 CBC or provide shear strength testing to support the recommended value. 10. The Consultant should specify the sulfate exposure category (AC[ 318) based on soluble sulfate testing and provide recomnwndations for sulfate resist~nt concrete, if necessary, br default to a severe exposure category, if testing is not available. I l. The Consultaht should provide a list of recommended observation and testi[!g during site grading and construction. 12. The Consultant should provide an updated list ofreferehces. HETHERINGTON ENGINEERING, INC. .. • • THIRD-PARTY GEOTBCHNJCAL REVIEW (FIRST) Projecl No. 9221.1 Log No. 21161 Novem ber 9, 2020 Page 3 The opportunity to be of service is sincerely appreciated. If you have any questions regarding this rev iew, please contact this office. Sincerely, HETHERfNGTON ENG JNEERfNG, lNC. a ·k . • r g n Civil Engineer 30488 Geotechnical Enginee (expires 3/31/22) Jaemin G. Blackwelder Engineer in Training ul /\. Bogseth fessional Geologist 3772 rtifiecl Engineering Geologist I 153 ~---ertified Hydrogeologisl 591 expires 3/31 /22) Distribution: I-via e-mail (David.Rick@carlsbadca.gov) I-via e-mail (Elissa.Tovar@carlsbadca.gov) HETHERINGTON ENGINEERING. INC.