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111 <br /> Geotechnical Engineering Report <br /> Proposed Flight Line Steam Line Project lrerracon <br /> Boeing Everett Facility • Everett, Washington <br /> January 17, 2012 • Terracon Project No.: 81115085 <br /> 1 ITEM DESCRIPTION <br /> • North: Buildings 40-21 and 40-51 <br /> • East: Asphalt and concrete pavement <br /> Surrounding developments <br /> • West: Asphalt and concrete pavement <br /> • South: Highway 526 <br /> Existing underground utilities including electrical and <br /> telephone conduits, steam lines, and water lines appear to be <br /> Utilities located near and cross portions of the planned utilidor <br /> I alignment. <br /> Current ground cover Asphalt and concrete pavement <br /> Existing topography Relatively level. <br /> 3.0 SUBSURFACE CONDITIONS <br /> 3.1 Typical Subsurface Profile <br /> Specific conditions encountered at each boringlocation are indicated on the individual boringlogs. <br /> P 9 <br /> Stratification boundaries on the boring logs represent the approximate location of changes in soil <br /> types; in-situ, the transition between materials may be gradual. Details for each of the borings can <br /> be found on the boring logs included in Appendix A of this report. <br /> The site is surfaced with asphalt and concrete pavement. Boring B-1 encountered 8 to 8'/z inches <br /> of concrete over 8 inches of crushed rock. Boring B-2 encountered 8 to 8% inches of concrete <br /> over 8 inches of crushed rock over 5 inches of asphalt treated base (ATB). Boring B-3 <br /> encountered 6%to 7 inches of asphalt over 6 inches of crushed rock over 7 inches of ATB. Boring <br /> B-4 encountered 4'/z inches of asphalt over 4 inches of crushed rock. <br /> Soil conditions encountered below the existing pavement section at the exploration locations <br /> generally consist of fill soils and native soils interpreted as glacial till. Fill soils were encountered in <br /> borings B-3 and B-4 to depths of approximately 3'/2 and 5%feet below existing grade, respectively. <br /> In general, the fill consisted of medium dense sand with trace silt and gravel. Buried asphalt and <br /> asphalt treated base were encountered at the bottom of the fill zone in borings B-3 and B-4, and <br /> are interpreted as relic pavements. Glacial till deposits were encountered below the pavement <br /> section in borings B-1 and B-2, and below the existing fill soils in borings B-3 and B-4. The glacial <br /> till deposits extended to the total depth explored of 19 feet below existing grade. In general, the <br /> glacial till consisted of very dense silty sand with to trace gravel. Cobbles and boulders were not <br /> encountered in the explorations completed for this study, but are not uncommon in glacial till <br /> deposits. <br /> I <br /> Responsive ■ Resourceful ■ Reliable 3 <br />