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, <br /> � <br /> ENVIRONMEN'CAL IMPACT STATEMENT <br /> FACTLITV EXPANSION <br /> EVERETf DIVISION BOEING <br /> TECHNICAL APPENDIX <br /> EARTH SECTION SUMMARY <br /> 1.0 INTRODUCTION <br /> This a.ction of the Environmental Impact Stetement�ddresses the possible negative impacu to the <br /> "earth" related elemena u A result of development of tha Everett Division Boeing site. The <br /> impects were evaluated in terms of the Proposed Action (Master Plon R-1) snd a No Action <br /> Alternative. <br /> � 2.0 EXISTING CONUITiONS <br /> The existing site conditions ere the result of a combination of pest geologic activitics �nd the <br /> development related to the eaisting use of the site as an eirplane manuCacturing facility. The <br /> existing site deveiopment encompasses approaSmately two-thirds to three-qusrten of the total site <br /> srea of approximately 1,000 acres. The site facility Dresently includea in excess o� 35 buildinga <br /> and related facilities, including azsociated outomobile parking and airplane ataging ereas. 7he <br /> remeinder of the site erea is presently vegeteted "open space'. <br /> Prior to site deveiopment, the cite surficiel geologic conditions were generally the resuit of past <br /> glacial advences into the Puget Lowlend eree, and the erosion of the site surCace since thet time. <br /> The giacial ectivities resuited in the deposition of relatively denae"gleciel tiil'eoils with overlying <br /> less dense end consistent silt to bouldtr siu materisls and occasional peat. <br /> The site development required earthwork including clearin4 and greding which generally removed <br /> topographic high ereas and filted depressions. Other earthwork wes usocia�ed with the removal <br /> of granular borrow materiel.The existing exposad soils are generetly moisture sensitive,or contain. <br /> more than 5 percent by weight pessing the No. 200 sieve. <br /> 1'he existing topography is a reflectlon of tl�e netural and man-made actions end is generally <br /> relatively flat-lying with prominent decreases in topogrephic relief near:ye northern and western <br /> boundaries of the site. <br />