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Home My WebLink AboutPD 2020-0046; KELLY ELEMENTARY SCHOOL MODERNIZATION; RESPONSE TO COMMENTS BY CITY OF CARLSBAD, THIRD PARTY REVIEW KELLY ELEMENTARY SCHOOL MODERNIZATION; 2021-02-03 5710 Ruffin Road | San Diego, California 92123 | p. 858.576.1000 | www.ninyoandmoore.com February 3, 2021 Project No. 108741014 Mr. Derrick Anderson, PE, CCM Carlsbad Unified School District 6225 El Camino Real Carlsbad, California 92009 Subject: Responses to Comments by City of Carlsbad, Third-Party Review Kelly Elementary School Modernization 4885 Kelly Drive, Carlsbad, California Project ID: GR2020-0030/PD2020-0046 Dear Mr. Anderson: This letter has been prepared in response to the City of Carlsbad Third-Party Geotechnical Review comments (Hetherington Engineering, Inc., 2020) regarding the referenced geotechnical evaluation report (Ninyo & Moore, 2020) and associated documents. Review comments provided in the referenced letter (Hetherington Engineering, Inc., 2020) and our responses to these comments are presented below. Comment 1: The Consultant should determine whether the site is a near fault site. Response: Section 6.6 of the referenced geotechnical evaluation geotechnical report (Ninyo & Moore, 2020) discusses the relevant faulting and seismicity associated with the project site. The site is not considered a near fault site. Comment 2: The Consultant should provide the risk category for the site. Response: The seismic risk category for the project site is Risk Category III. Comment 3: The Consultant should provide dynamic lateral force retaining wall design, if necessary. Response: A dynamic lateral earth pressure (PE) value of 22H for retaining wall design is presented on Figure 10 of the referenced geotechnical evaluation report (Ninyo & Moore, 2020). Comment 4: The Consultant should provide a statement as to the impact of the proposed construction on adjacent properties. Response: From a geotechnical standpoint, as designed, the planned project is not anticipated to destabilize adjacent properties or Right-of-Ways. Geotechnical & Environmental Sciences Consultants Ninyo & Moore | 4885 Kelly Drive, Carlsbad, California | 1087410 | February 3, 2021 2 Comment 5: The Consultant should review the project grading and foundation 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 referenced report. Response: Ninyo & Moore has reviewed the project grading plans (LPA Design Studio, 2021). Based on our review, the referenced grading plans (LPA Design Studio, 2021) are in general accordance with the recommendations of the referenced geotechnical evaluation report (Ninyo & Moore, 2020). This document serves as our grading plan review letter for the project. Additionally, Ninyo & Moore has previously reviewed the project foundation plans (LPA Design Studio, 2020) and found them to be in general accordance with the recommendations of the referenced geotechnical evaluation (Ninyo & Moore, 2020). Comment 6: The Consultant should provide a list of recommended observation and testing during grading and construction. Response: During construction we recommend that the duties of the geotechnical consultant include, but not be limited to: •Observing excavation bottoms and the placement and compaction of fill during earthworkoperations, including trench backfill. •Evaluating imported materials prior to their use as fill, if used. •Performing field tests to evaluate soil compaction during earthwork operations. •Providing continuous observations during ground improvement operations to evaluate theirimplementation and to provide confirmation testing of improved soils. •Observing foundation excavations for bearing materials and cleaning prior to placement ofreinforcing steel or concrete. Ninyo & Moore appreciates the opportunity to be of continued service on this project. Respectfully submitted, NINYO & MOORE Kai Vedenoja, PE Senior Project Engineer Jeffrey T. Kent, PE, GE Principal Engineer KAV/JTK/gg Attachments: References Attachment A – Hetherington Engineering, Inc. Letter dated December 22, 2020 Ninyo & Moore | 4885 Kelly Drive, Carlsbad, California | 1087410 | February 3, 2021 1 REFERENCES Hetherington Engineering, Inc., 2020, Third-Party Geotechnical Review (First), Geotechnical Evaluation, Kelly Elementary School, 4885 Kelly Drive, Carlsbad, CA, Project ID: GR2020-0030/PD2020-0046: dated December 22. LPA Design Studio, 2020, Kelly Elementary School Modernization Foundation Plans, DSA approval stamp dated: May 18 (Sheets S0.01, S0.11 through S0.14, SA2.10 and SG2.10). LPA Design Studio, 2020, Kelly Elementary School Modernization Plan Check Resubmittal Grading Plans, undated (Sheets 1 through 18). Ninyo & Moore, 2020, Update Geotechnical Evaluation, Kelly Elementary School Modernization, 4885 Kelly Drive, Carlsbad, California, Project No. 108741005: dated March 6. Ninyo & Moore | 4885 Kelly Drive, Carlsbad, California | 108741005 | March 6, 2020 ATTACHMENT A Hetherington Engineering, Inc. Letter dated December 22, 2020 HETHERINGTON ENGIN EERING , INC. SOIL & FOUNDATION ENGINEER ING • ENGINEER ING GEOLOGY• HYDROGEOLOGY City of Carlsbad Land Development Engi neeri ng 1635 Faraday A venue Carlsbad, Ca lifornia 92008-73 14 Attention: Mr. David Rick December 22, 2020 Project No. 9262.1 Log No. 21226 Subject: THTRD-P/\RTY GEOTECHNl CAL REVIEW (FJRST) Geotechnical Evaluation Kelly Elementary School 4885 Kel ly Drive Carlsbad, Cal iforn ia Project ID: GR2020-0030/PD2020-0046 References: 1. "Updated Geotechnical Evaluation, Kelly Elementary School Modernization, 4885 Kelly Drive, Carlsbad, Ca li forn ia", by Ni nyo & Moore, dated March 6, 2020. · 2. "Grading Plans for: Kelly Elementary School Modernization", by LPA Design Studios, undated (Sheets I through 20). Dear Mr. Rick: In accordance with your request, Hetherington Engineering, Inc. has provided third -party geotechnica l review of Reference I. The fo llowing comments are provided for ana lyses and/or response by the Geotechnical Consultant. REVIEW OF GEOTECHNICAL REPORT I. The Consultant shou ld determine whether th e site is a near fault site. 2. The Consultant should provide the risk category for the site. 3. The Consul tant should provide dynamic lateral force retain ing wall design, if necessary. 4. The Consultant should provide a statement as to the impact of the proposed construction on adjacent properties. 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 GEOTECHNTCAL REVTEW (FIRST) Project No. 9162.1 Log No. 21226 December 22, 2020 Page 2 5. The Consultant shou ld review the project grading and foundation plans, provide any additional geolechnical recommendations considered necessary, and confirm lhat the plans have been prepared in accordance with the geotechnical recommendations prov icled in the referenced report. 6. The Consul tant shoul d provide a list of recommended observation and testing during grad ing and construction. The opporlunity to be of service is sincerely appreciated. ff yo u have any questions regarding this rev iew, please conta ct this office at your convenience. Sincerely, HETHERrNGTON ENGrNEERrNG, rNC. a· theri1 g Civil Engineer 30488 Geotechnica l Engineer 397 (expire 3/3 1/22) Distribution: I-v ia e-mail (David.Rick@carl sbadca.gov) I-v ia e-mail (Elissa.Tovar@carlsbadca.gov) HETHERINGTON ENGINEERING, INC.