3322 KROMER AVE Geotech Report 2023-05-25

GeoTest Services, Inc.—Revision 1 April 10,2020 Kikuchi Retaining Wall, Everett,Washington Project No.20-0344 immiNimm might be present. The drainpipe should be set below the base of the wall with adequate fall to collect and convey to a suitable discharge area. GeoTest understands that an easement will be required to convey collected water to a municipal outlet. Temporary and Permanent Slopes The contractor is responsible for construction slope configurations and maintaining safe working conditions, including temporary excavation stability.All applicable local,state, and federal safety codes should be followed.All open cuts should be monitored during and after excavation for any evidence of instability. If instability is detected, the contractor should flatten the side slopes or install temporary shoring. Temporary excavations in excess of 4 feet should be shored or sloped in accordance with Safety Standards for Construction Work Part N, WAC 296-155-66403. Temporary unsupported excavations in transitional beds, encountered at the project site are classified as a Type B soil according to WAC 296-155-66401 and may be sloped as steep as 1H :1V (Horizontal: Vertical). Fill, if encountered, should be classified as Type C soil and may be sloped as steep as 1.5:1.All soils encountered are classified as Type C soil in the presence of groundwater seepage and may be sloped as steep as 1.5:1. Flatter slopes or temporary shoring may be required in areas where groundwater flow is present and unstable conditions develop. Temporary slopes and excavations should be protected as soon as possible using appropriate methods to prevent erosion from occurring during periods of wet weather. GeoTest recommends that permanent cut or fill slopes be designed for inclinations of 2H:1V or flatter. At the time of this report, a grading plan has not been finalized. During initial project intake, GeoTest discussed the option of utilizing on-site grading to reduce the size or possibly eliminate retaining walls along the east-west wall at the toe of the north-facing slope. Should grading be utilized, GeoTest recommends adherence to finished 2H:1V slope configurations. GeoTest recommends that all permanent slopes be vegetated or otherwise protected to limit the potential for erosion as soon as is practical after construction. Geotechnical Consultation and Construction Monitoring GeoTest recommends that we be involved in the project design review process. The purpose of the review is to verify that the recommendations presented in this report are understood and incorporated in the design and specifications. We also recommend that geotechnical construction monitoring services be provided. These services should include observation by GeoTest personnel during structural fill placement, 18