4920 EVERGREEN WAY STAPLES Geotech Report 2022-10-25

Geotechnical Engineering Report lierracon Staples Rockery Failure■ Everett,Washington March 8, 2019 ■ Terracon Project No. 81175122 the results of previous readings and the rate of construction. As a minimum, readings should be taken about once a week throughout construction until the wall is completed. All readings should be reviewed by Terracon. In order to establish the condition of existing facilities prior to construction, we recommend that Hilbers, Inc. make a complete inspection and evaluation of pavements, structures, utilities, and other facilities near the project site. This inspection should be directed towards detecting any existing signs of damage, particularly those caused by settlement or lateral movement. The observations should be documented by pictures, notes, survey drawings, or other means of verification. The contractor should also establish for their own records the existing conditions prior to construction. 5.0 GENERAL COMMENTS Terracon has been retained to prepare the final design plans and specifications for the proposed soldier pile / tieback retaining wall. These plans and specifications will be prepared using this geotechnical report as a basis of design and will incorporate considerations from Staples, the contractor, and the City of Everett. Terracon has also been retained to provide observation and testing services during soldier pile / tieback retaining wall construction and other earth-related construction phases of the project. The analysis and recommendations presented in this report are based upon the data obtained from the explorations performed at the indicated locations and from other information discussed in this report. This report does not reflect variations that may occur between explorations, across the site, or due to the modifying effects of construction or weather. The nature and extent of such variations may not become evident until during or after construction. If variations appear, we should be immediately notified so that further evaluation and supplemental recommendations can be provided. The scope of services for this project does not include either specifically or by implication any environmental or biological (e.g., mold, fungi, bacteria) assessment of the site or identification or prevention of pollutants, hazardous materials or conditions. If the owner is concerned about the potential for such contamination or pollution, other studies should be undertaken. This report has been prepared for the exclusive use of Staples, Inc. for specific application to the project discussed and has been prepared in accordance with generally accepted geotechnical engineering practices. No warranties, either express or implied,are intended or made. Site safety, excavation support, and dewatering requirements are the responsibility of others. In the event that changes in the nature, design, or location of the project as outlined in this report are planned, the conclusions and recommendations contained in this report shall not be considered valid unless Terracon reviews the changes and either verifies or modifies the conclusions of this report in writing. Responsive ■ Resourceful ■ Reliable 14