23-141-SC_141_Archer_Plan_Review_Letter_Civil_and_Structural.pdf

B U T A N O G E O T EC H N I C A L E N G I N E E R I N G , I N C .

404 WESTRIDGE DRIVE, WATSONVILLE, CALIFORNIA 95076

PHONE: 831.724.2612

WWW.BUTANOGEOTECH.COM

September 27, 2023 Project No. 23-141-SC

Scott Winton 141 Archer Drive Santa Cruz, California 95060

SUBJECT: GEOTECHNICAL PLAN REVIEW

Proposed Retaining Wall Mitigation 141 Archer Drive Santa Cruz, California

REFERENCE: Butano Geotechnical Engineering, Geotechnical Investigation –

Design Phase, 141 Archer Drive, Santa Cruz, California, Project No.

23-141-SC, June 1, 2023

Butano Geotechnical Engineering, Addendum Recommendations – Grouted Tiebacks, 141 Archer Drive, Santa Cruz, California, Project No. 23-141-SC, July 14, 2023

1. INTRODUCTION

a. Per your request, we have reviewed the following plans for the proposed retaining wall mitigation.

Brock Dickie Engineering, Sheet S-1 dated 9-25-23 and S-2 dated 9-21-23.

Ramsey Civil Engineering, Inc. Sheet C1.0, C2.0, C3.0, C3.1, C4.0, C5.0, C6.0, C7.0 dated 9-22-23.

b. The purpose of our review was to ensure the conformance of the geotechnical aspects of the plans with the geotechnical conditions present on the site and with the recommendations provided in the referenced report.

Geotechnical Plan Review September 27, 2023 141 Archer Drive Project No. 23-141-SC Santa Cruz, California Page 2

2. CONCLUSIONS AND RECOMMENDATIONS

a. It is our opinion that the plans reviewed are in general conformance with the geotechnical conditions present and with the recommendations presented in the referenced report.

b. The recommendations presented herein and in the referenced report should not be considered to preclude more restrictive criteria by the governing agencies or by structural considerations.

c. In the event that changes are made to the plans, the revised plans should be forwarded to the Geotechnical Engineer to review for conformance with the previous recommendations.

d. Observation and testing services should be provided by Butano Geotechnical

Engineering, Inc. during construction of the subject project. All earthwork must be observed and approved by the Geotechnical Consultant. Any earthwork performed without the full knowledge and observation of Butano Geotechnical Engineering, Inc. will render the recommendations of this review invalid. During grading, all excavation, fill placement and compaction operations should be observed and field density testing should be performed to evaluate the suitability of the fill, and to determine that the applicable recommendations are incorporated during construction.

3. LIMITATIONS

a. Our review was performed in accordance with the usual and current standards of the profession, as they relate to this and similar localities. No other warranty, expressed or implied, is provided as to the conclusions and professional advice presented in this review.

b. As in most projects, conditions revealed during construction may be at variance with preliminary findings. Should this occur, the changed conditions must be evaluated by the Geotechnical Engineer and revised recommendations provided as required.

c. This report is issued with the understanding that it is the responsibility of the

Owner, or his Representative, to ensure that the information and recommendations presented herein are brought to the attention of the Architect and Engineers for the

Geotechnical Plan Review September 27, 2023 141 Archer Drive Project No. 23-141-SC Santa Cruz, California Page 3 project and incorporated into the plans, and that the Contractor and Subcontractors implement such recommendations in the field.

d. This firm does not practice or consult in the field of safety engineering. We do not direct the Contractor's operations, and we are not responsible for other than our own personnel on the site; therefore, the safety of others is the responsibility of the Contractor. The Contractor should notify the Owner if he considers any of the recommended actions presented herein to be unsafe.

e. The findings of this review are considered valid as of the present date. However, changes in the conditions of a site can occur with the passage of time, whether due to natural events or human activity on this or adjacent sites. In addition, changes in applicable or appropriate codes and standards may occur as a result of legislation or a broadening of knowledge. Accordingly, this review may become invalidated, wholly or partially, by changes outside our control. Therefore, this report is subject to review and revision as changed conditions are identified.

It is a pleasure being associated with you on this project. If you have any questions or if we may be of further assistance please do not hesitate to contact our office.

Sincerely, BUTANO GEOTECHNICAL ENGINEERING, INC.

Greg Bloom, PE, GE Principal Engineer