4201 RUCKER AVE COMMUNITY HEALTH CENTER 2019-04-10

Geotechnical Engineering Report ii May 25,2017 Central Everett CHC,Everett,Washington RGI Project No.2017-094 Executive Summary This Executive Summary should be used in conjunction with the entire GER for design and/or construction purposes. It should be recognized that specific details were not included or fully developed in this section, and this GER must be read in its entirety for a comprehensive understanding of the items contained herein. Section 7.0 should be read for an understanding of limitations. RGI's geotechnical scope of work included the advancement of two test borings to a maximum depth of 31.5 feet below ground surface (bgs). Based on the subsurface information, the site is suitable for development of the proposed project. The following geotechnical considerations were identified. Soil Conditions: The site is underlain by up to 10 feet of medium dense sand with some silt and silty sand with trace gravel over dense to very dense silty sand with trace gravel and sand with some silt and very stiff to hard silt with varying amounts of sand. Groundwater: Groundwater seepage was encountered in boring B-2 at depths ranging from 10 feet to 22 feet below grade during drilling. Foundations: Foundations for the proposed new building elements can be supported on micro piles or helical anchors bearing on medium dense to very dense native soil. Slab-on-grade: Slab-on-grade floors for the proposed building can be supported on medium dense native soil. Pavements:The following new pavement sections are recommended: ➢ For heavy truck traffic areas: 3 inches of Hot Mix Asphalt over 6 inches of crushed rock base (CRB) over compacted subgrade ➢ For general parking areas: 2 inches of Hot Mix Asphalt over 4 inches of CRB over compacted subgrade ➢ For concrete areas: 5 inches of concrete over 4 inches of CRB over compacted subgrade II . RILEYGROUP