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MEMORANDUM <br /> TO: Kirk Brooks <br /> � FROM: Jane Zimmerman <br /> � JATE: July 39, 1991 I <br /> • SUBJECT: Boeing Plan Review II <br /> � 3� I <br /> The notes below should be addei�6 the erosion control plan <br /> for the area south of the 40� building. Thase notes are <br /> pretty much directly out of the mitiqation requirements for <br /> areas which contain moisture sensitiva soila. <br /> , <br /> � 1) Site disturbance in areae of moisture sensitive soils <br /> � must ha limited, where possible, by using tracked equipment. <br /> � 2) Standinq water must be removed from surface areas prior <br /> , to excavation. <br /> � 3) Temporary slopes within native glacial soils must be <br /> limited to a maximum angle of 1/2H: 1V. �i.=mporzry fill <br /> slopes must be limited to a maximum anqle of 1H: 1V. <br /> � . <br /> 4) Temporary slopes must be covered with an impermeable <br /> � membrane, sucl� as Visqueen, in oz•der to prevent erosion of <br /> iI the slopes. <br /> I ' <br /> • In addition the mitigation document r�:quires two additional <br /> items that Boeing may or may not have prepared at this time. <br /> The items are: <br /> 1) A qeotechnical report which identifies all faciliLias <br /> which are proposed to be located on areas which contain <br /> � potentially moisture sensitive soils. <br /> 2) A plan to maximize the extent to which soils which <br /> become diFturbed, and which are above their optimum moisture <br /> content, are allowed to dry to within their optimum moisture <br /> � content and to be recompacted on-site, and ninimize the <br /> extent that such soils will be removed from the construction <br /> site. <br />