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�-- <br /> ( ( _ <br /> � <br /> Gcouchnical Engineeriag R�K <br /> Lowall Short Plat <br /> June?, 1999 <br /> NCA File No.259499 <br /> Page 6 <br /> summer roonths, if possible. If earthwork is to be accomplis6ed ducing W'ot we�h�''� a bleaket of rock <br /> spalls may be needed in the planned access roadwaY• '�7x thi°kn�'S of the spalls should be based on soil <br /> conditions at the time thac thc site is developed aed the Perfa��� �der h�avY e4uipmmt. For wet <br /> �veather considecations,we rocommend using a min'unu.�n of a 1 fooc th+�l�ess of spal����w� <br /> estimating pwposes. Crushed rock may be needed to pcoteet footing s�bSrad <br /> weather conditions. <br /> Following strippin&the roadwaY snes should be compseted w a non-yieldinB condition. If th�subg�de <br /> is observed to weave excessively during compaction. ropairs may be necesserY or anoth�T m�od of <br /> prcparation may 1x re9uired• Alte�native site preparauon methods should be detennined based °n' <br /> conditions observed in the field• 'Chis could include overexcavetion of weaving soils ot use of rocic apalls <br /> fur fill. In wet or pumpin6�> a non-woven filter fabric may be nerdad under the new fi11 to act .a a <br /> separator to keep fines frum conteminatin8 the imP°rt°d m°��al. <br /> perunsneatSlopes <br /> Final slope inclinations for swctu�'al fill and the native soils should�bb w�P���s�Id be no <br /> compscted fills or common fi�ls such es the existin6 stope �O°g,tentially with some organics, that aze <br /> steeper than 3H:1 V. Common fills are defin�d as f�11 material, po <br /> "trackrolled" into ptace and uscd for lendscaping• 'I'hey would ttot meet the compaction specif,�ation of <br /> structural fi1L Final slopes should be vegetated and coverod with straw ot jute netting• The veKetat�on <br /> sfiould be maintained unul it hu been established. <br /> The e�isting fill slope along the west propecty line is considered to be a common fill. Provided th�s�k� <br /> is 8raded tu a ma.��mum 3H:1 V slope angle, it is our opinion thst tt�e slope should aot reptese <br /> tbe project. <br /> Shvctural Fill <br /> General: All fill plaa �eneath buildings, pavements or other setUemant sensitive festures should be <br /> placed as structural fill. For the pucpose of this report, ecruccural fill is defined as material diat is Placed <br /> in accordance with p�'�ribed methods and ststtdards, end is monitorod by an exPerieaee� B�°tect'I'ica! <br /> professional or soils technician. Field monitoring procedures would include the performance of a <br /> representative mm�ba of in-place density tests to document the attai+un�nt of the desired degrx of <br /> . NELSON-COUVRETTE&ASSOCIATES, 1N�C• <br /> / <br /> , ........ <br />