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. � <br /> � � l�erracon <br /> JUI Z4, 'I9J� PROJECT iEAM <br /> y 6/10-151M Awnua NE <br /> RedrorM,Wa�Mrqtan 9805: <br /> (toElesl�6000 fax1�o61B61•eoso <br /> Bechtel Corporation <br /> 8140 Old Highway 99 Southeast <br /> Tumwater, Washington 98501 <br /> • Attn: Mr. Jim Collins <br /> Re: Proposed U.S. West Tower Sfte SEA-116D <br /> 3200 20th Street <br /> Everett, Washinpton <br /> GeoEnp(neen Project No. 5408-001-01, Taak 16 <br /> Please find attached the preliminary boring log from the geotechnical expioration of the site <br /> conducted on May 19, 1997. Preliminary geotechnical engineering recommendations for design <br /> of the drilled shaft tower foundation include the following: • <br /> • Minimum Shaft Dfameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 inches <br /> • Mfnimum ShaR Lenglh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 feet <br /> • Maximum End Bearing Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 48,000 psi <br /> • Shaft Skin Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 psf <br /> • Passfve Pressuro -Above Ground Water(equivalent fluid density) . . . 410 psflft <br /> • Coefficient of Horizontal Subgrade Reaction . . . . . . . . . . . . . . . . . . . . . . 15 tsf <br /> The equivalent fluid density and ccefficfent of horizontal subgrade reaction presented above are <br /> ultimate values and an appropriate factor of safety should be applied to the design of the drilled <br /> shaft foundation. The soil modulus for the subgrade soils increases linearly with depth by an <br /> amount equal to the coe�cient of subgrade reaction. <br /> Other design and construction details will be provided in the final geotechnicai report for the project. <br /> Sincerely, <br /> TERRACON PRO.IFCT TEAM <br /> ��/��� <br /> Shaun D. 5tau er, P.E. <br /> Geotechnical Engineer <br /> Daumenl 10: P.l•./OB001lSEA4150.PRE <br /> Enclosure: Boring Log <br /> cc: Mr. Don Clark <br /> Terracon Consuttants Westem, Inc. <br /> 5035 S. 33rd St. <br /> Phoenix, AZ 85040 <br /> GEOTECMNICRL,ENVIRONMENTAL AND MATERIALS ENOINEERS OUAIfTY EN(iINEERINO5INCE ti65 <br />