6101 ASSOCIATED BLVD BASE FILE 2017-06-05

Underwood Gartland Everett, LLC ES-2232.02 February 6, 2015 Page 2 Site infrastructure improvements will include underground utility installations, stormwater facilities, and pavement areas. Stormwater generated from site impervious surfaces will be collected and conveyed to stormwater pond facilities. Final plans were being developed at the time this report was prepared. However, we expect the stormwater pond facilities will be located along the westerly margins of the site. The pond construction will also likely incorporate retaining wall structures consisting of modular block or rockery. If the above design assumptions are incorrect or change, ESNW should be contacted to review the recommendations in this report. ESNW should review the final design to verify that our geotechnical recommendations have been incorporated. SITE CONDITIONS Surface The subject property is located immediately north of the existing Cemex sand and gravel facility along Glenwood Avenue, in Everett, Washington. The 30 acre property was previously mined for sand and gravel, and subsequently filled. As described previously, the site was graded in the summer of 2012 in preparation of development and construction of two warehouse structures. As a result of the 2012 grading activities, surface topography throughout the site where development is planned is relatively flat to slightly undulating to accommodate drainage. Exposed earth surfaces throughout the building pad areas have been armored with crushed rock. Descending slope areas to the north and east of the development area are fully vegetated and stabilized. Existing Descending Slope Stability During the 2012 site grading activities, Cemex and their consultants implemented a stabilization plan for the descending slope areas to the north and east of the development area. Re-grading of the slopes to a 2H:1 V inclination and implementation of drainage controls were completed as part of the earlier 2012 earthwork activities. Permanent vegetation and erosion control elements were installed following the slope grading and stabilization. Based on our observations during and after implementation of the slope re-grading activities, the descending slopes adjacent to the proposed development area have been property stabilized. Based on our review of the current development plans, the proposed development activities will not adversely impact the stability of the existing descending slope areas. Subsurface Subsurface conditions throughout the site were explored through a series of borings and test pits previously acquired by GeoEngieers in November 2011. Please refer to the boring and test pit logs provided in Appendix A for a more detailed description of the subsurface conditions. The approximate locations of the test site are depicted on the Boring and Test Pit Location Plan (Plate 2). During the November 2011 investigation, ESNW representatives coordinated alongside with GeoEngineers to observe and document the findings of the investigation work. Earth Solutions NW,LLC