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Home My WebLink AboutSDP 2021-0028; LEGOLAND PARKING STRUCTURE #2; THIRD-PARTY GEOTECHNICAL REVIEW (FIRST); 2022-04-22 April 19, 2022 Project No. 9670.1 Log No. 21848 City of Carlsbad Land Development Engineering 1635 Faraday Avenue Carlsbad, California 92008-7314 Attention: Mr. Emad Elias Subject: THIRD-PARTY GEOTECHNICAL REVIEW (FIRST) Legoland Parking Structure #2 One Legoland Drive Carlsbad, California GR2022-0007 References: 1. “Geotechnical Investigation, Legoland – New Parking Structure, One Legoland Drive, Carlsbad, CA 92008,” by Nova Services, Inc., dated Revised November 24, 2021. 2. “Grading Plans For: Legoland Parking Structure,” by Nasland Engineering, undated (9-Sheets). Dear Mr. Elias: In accordance with your request, Hetherington Engineering, Inc. has provided third-party geotechnical review of Reference 1. The following comments are provided for analyses and/or response by the Geotechnical Consultant. 1. The Consultant should review the project grading plan (Reference 2) and foundation plans, provide any additional geotechnical analyses/recommendations considered necessary, and confirm that the plans have been prepared in accordance with the geotechnical recommendations. 2. The Consultant should provide the site Seismic-Risk Category. 3. The Consultant should address impacts to adjacent property and improvements as a result of site grading and construction. 4. The Consultant should specify the sulfate exposure category (ACI 318) based on the soluble sulfate testing and provide recommendations for sulfate resistant concrete, if necessary. SOIL & FOUNDATION ENGINEERING ENGINEERING GEOLOGY HYDROGEOLOGY (760) 931-1917 Fax (760) 931-0545 333 Third Street Laguna Beach, CA 92651 (949) 715-5440 Fax (949) 715-5442 Carlsbad, CA 92008-43695365 Avenida Encinas, Suite A HETHERINGTON ENGINEERING, INC. www.hetheringtonengineering.com • • • • • • • • THIRD-PARTY GEOTECHNICAL REVIEW (FIRST) Project No 9670.1 Log No. 21848 April 19, 2022 Page 2 5. The Consultant should provide a list of recommended observation and testing during site grading and construction. Please call if there are any questions. Sincerely, HETHERINGTON ENGINEERING, INC. Mark D. Hetherington Civil Engineer 30488 Geotechnical Engineer 397 (expires 3/31/22) Distribution: 1-via e-mail (LDEtrackingdesk@carlsbadca.gov) 1-via e-mail (Emad.Elias@carlsbadca.gov) HETHERINGTON ENGINEERING, INC. GEOTECHNICAL MATERIALS SPECIAL INSPECTION DVBE ⬧ SBE ⬧ SDVOSB ⬧ SLBE 4373 Viewridge Avenue, Suite B San Diego, CA 92123 P: 858.292.7575 www.usa-nova.com 944 Calle Amanecer, Suite F San Clemente, CA 92673 P: 949.388.7710 Mr. Tom Storer, Senior Project Manager April 29, 2022 Merlin Entertainment Group NOVA Project No. 2021212 c/o LEGOLAND California, LLC One Legoland Drive Carlsbad, California 92008 Subject: Geotechnical Update Responses to Third-Party Geotechnical Review Comments LEGOLAND – New Parking Structure One Legoland Drive, Carlsbad, CA 92008 References: Culp & Tanner Structural Engineers (2022), Legoland Guest Parking Structure, Carlsbad, California, IPD Job No. 21-416, Progress Set, April 27. Hetherington Engineering, Inc. (2022), Third-Party Geotechnical Review (First), Legoland Parking Structure #2, 1 Legoland Drive, Carlsbad, California, GR2022-0007, Project No. 9670.1, Log No. 21848, April 19. Nasland Engineering (undated), Grading Plans, Legoland Parking Structure, 1 Legoland Drive, Carlsbad, California. NOVA (2022), Geotechnical Investigation, LEGOLAND – New Parking Structure, One Legoland Drive, Carlsbad, CA, 92008, NOVA Project No. 2021212, November 24. WGI (2022), Geopier Foundation System, Legoland Guest Parking Structure, Carlsbad, California, Project No. GDC-740, April 15. Dear Mr. Storer: NOVA Services, Inc. (NOVA) prepared this geotechnical update to respond to third-party review comments from the Hetherington Engineering (2022) for the LEGOLAND – New Parking Structure. NOVA is retained by LEGOLAND California, LLC as the geotechnical consultant of record for the project. The review comments and our responses are provided below. Comment 1: The Consultant should review the project grading plan (Reference 2) and foundation plans, provide any additional geotechnical analyses/recommendations considered necessary, and confirm that the plans have been prepared in accordance with the geotechnical recommendations. Response: NOVA reviewed the referenced grading plans (Nasland Engineering, undated), foundation plans (Culp & Tanner Structural Engineers, 2022) and Geopier plans and calculations (WGI, 2022). NOVA’s review was limited to the geotechnical aspects of the plans. Based on our review, it is NOVA’s opinion that the plans have been prepared in accordance with the recommendations contained in the project geotechnical report (NOVA, 2022). Response to Third-Party Geotechnical Report Review LEGOLAND – New Parking Structure, Carlsbad, CA NOVA Project No. 2021212 April 29, 2022 2 Comment 2: The Consultant should provide the site Seismic-Risk Category. Response: The Seismic Risk Category is II. Please see structural note 20-3B on S1.01 (Culp & Tanner Structural Engineers, 2022). Comment 3: The Consultant should address impacts to adjacent property and improvements as a result of site grading and construction. Response: In our opinion, the adjacent property and improvements will not be impacted by the proposed site grading and construction provided the recommendations contained in the project geotechnical report (NOVA, 2022) are followed. Comment 4: The Consultant should specify the sulfate exposure category (ACI 318) based on the soluble sulfate testing and provide recommendations for sulfate resistant concrete, if necessary. Response: Based on the soluble sulfate testing and in accordance with ACI 318, the sulfate exposure class is S0, and the exposure severity is N/A. Comment 5: The Consultant should provide a list of recommended observation and testing during site grading and construction. Response: The following geotechnical observation and testing services during site grading and earthwork construction are recommended: • Attend the grading preconstruction meeting • Observe ground preparation prior to fill placement • Observe and map the geologic conditions exposed during grading • Observe placement and compaction of fill, backfill, and paving materials and perform field density testing • Perform laboratory tests on fill, backfill, and paving materials used • Observe Geopier installation • Observe foundation excavations to evaluate conformance with the project plans and geotechnical recommendations • Prepare daily field reports summarizing the day's activity with regard to earthwork • Prepare supplemental reports and letters as needed and a final report upon completion of the earthwork summarizing the results of our geotechnical observation and testing and our conclusions regarding conformance with the project plans and specifications If you have any questions, please call us at 858.292.7575 x 406. Sincerely, NOVA Services, Inc. _________________________ _________________________ Tom Canady, PE Melissa Stayner, PG, CEG Principal Engineer Senior Engineering Geologist