4815 EVERGREEN WAY 2016-01-01 MF Import

JP Morgan Chase April 29, 2010 Geotechnica!Investigation Proposed Chase Bank Everett, WA PSI Report No. 0704186 2.2 GEOLOGY Available geclocic literature indicates the site is located in the Puget Lowland physiographic province. The entire Pudget Lowland was coverered by glacial ice approximately 18,000 years ago. Approximately 14,000 years ago the glacial ice melted and retreated to the north. The City of Everett is manlled with unconsolidated Quarternary deposits dominated by glacial outwash drift and alluvial sands and gravels with interbedded silts. These unconsolidated deposits formed as the glaciers melted during the late Pieistocene-age. 2.3 TC/POGRAPHY The site is relatively flat and currently paved or landscaped in areas beyond the existing structure. Within the existing paved areas of the shopping center, the site slopes gradually from southeast to northwest. Total relief on the site is on the order of 5 feet From approximate elevaticn 305 feet in the southeast corner to approximate elevation 300 in the northwest corner. Based on USGS topographic mapping and Googlc Carth, the site average elevation of the site is approximately 303 feet above mean sea level (MSL). 3.0 SUBSURFACE CONDITIONS 3.1 SUBSURFACE DESCRIPTION Gubsurface materials and conditions were investigated on Aprii 20, 2010 with four borings designated as B-1 through B-4 drilled near the perimeter of the existing Holiywood Video store. Borings B-1 and B-2 were drilled in existing asphalt paved areas, while Borings B-3 and B-4 were �rilled in exisling landscaped areas. Borings B-1, B-2 and B-3 were drilled to depths of approximately 26'/�feet below the ground surface (bgs), while Boring B-4 was driiled to a depth of approximately 11-1/2 feet bgs. The approximate locations of the borings are shown on the Site Exploration Plan, Figure 2. The field exploration and labora�ory testing program for this study are discussed in Appendix A. Logs of the borings are shown in the aopendix. The average depth of asphalt encountered in Borings B-1 and B-2 was approximately 3 inches. Mulch up to S inches in depth was encountered in Borings B-3 and B-4 performed in the lardscaped areas. Below the asphalt and mulch, fill was encountered in each of the borings io an average depth of of approximately 3-1/2 feet bgs. It appears this fill was placed as part of the site development for the existing structure. The fi!I consisted primari�y of sandy siit with gravel and ne;phalt fragments. Standard Penetration Test (SPT) N-values in the fill ranged from 11 blows per foot to 34 blows per foot (as noted on the Boring Lons) indicaling medium dense to dense consistency. Based on the N-values it appears the existing fill was placed with some degree of compactive effort. Below the fill, native soils consisting of granular outwash sands and gravels were encountered to the termination depths in each of the borings. The predominant soil type encountered in each ��; p