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� '�ZA Proposed Intmanuel Lutlteran Church AAd!tlon <br /> ,•-•e v,mQ. )•1788-3 <br /> � � Febrvary 23, 2005 <br /> Page 5 <br /> � stripping and grading activities arc perfomicd during extended dry wcather periods, extensivc <br /> subgrade protection measures may not be necessary. However, it should be noted tliat <br /> � intermittent wet weather periods during the summer months coul�J delay carthwork if soil <br /> moisture caiditions become clevatcd above the optimum moisture content. Tl�e usc of a <br /> working surface of pit-run sand and gravcl, crushed rock, rn• yuary spalls with Iess than 3 <br /> � percent fincs may be requircd to protect the ncar-surface silty soils, particularly in arcas <br /> suppo�ting concenhated equipmcnt trr�ffia [f wet conditions make it necessary, dedicated <br /> haul roads anJ lavdo�vn arcas should I�c cnnstructcd n�iUi n contr,�ctor-dc:;igned thirknrss of <br /> � "sclecC� grunul:ir lill. �- �o -I-inch quarn� s��alls. nr crushrd rec��cicd conrrctr ul cqai�;ilrnt <br /> gradation. <br /> � Sul��icic Prcu��ratiuu: Pullu«�ing ihc r��comn�cn�lcd sitc ,u�ipping ��rucr�lures, ihc strippcd <br /> subgradc within thc building and pavcmcnt arcas should be proofrollcd �vith hcavy ivbbcr- <br /> � tired construction equipment, such as a fully-loaded tandcnraxle dump tnick, to dctect suft <br /> and/or yidding soiis. The exposeJ subgrade soils should Ue compacted to a finn, unyiclding <br /> condition, and to a minimum compaction of 95 perccnt of thc maximum laboratory dcnsity. <br /> , as dctennined by ASTM D-1557-)1. fn the cvent Ihat compaction tails to meet thc specificd <br /> � critcria, the upper 12 incl�es of subgr�de should he scarified and moisture conditioned, as <br /> required to obtain at Icast )5 perccnt of thc maximum laboratory density. Thosc soils which <br /> are sotl, yielJing, or unable to Uc canpacted to the specified criteria should bc overexcavated <br /> ancl wasted fi�om tlie sitc. Alternativcly, soils that arc too �ti�ct to adequately compact shou'.�� <br /> be aeratcd and dricd to suitahle moisture contcnt and recompacted. Tlie overescavation <br /> shoulJ be Uackfilled with structural till matcri:il that mccts the criteria spccified herein and <br /> placed and compacted in accordancc ���ith the Fil! Plnceme�it and Conrpnction Criteria <br /> paragraphs oPthis report <br /> Prozcn Sub�rade Soils: If cartlnvork takes place during lreczing conditions, all exposcd <br /> subgradcs should be allowed to tha��� and then bc rccompacted prior to placing subsequcnt <br /> � lifts of structural fill or Coundation components. Altematively, the frozcii material could be <br /> ! stripped fi�om ihe subgradc tu revc�l uufroren soil prior to placing suUscquent litis of fill or <br /> foundation componcnts. Thc frozcn soil sho��ld not bc rcascd as structural fill until nllowed <br /> � to thaw and adjusted to the proper nwisture content, which nuiy not be possiblc during �vinter <br /> � months. <br /> � Geotechnical Monitorin�: Thc Gcotechnical Gnginecr of record should Ue present during site <br /> preparation operations to obscive stnpping and grubbing clepdis, observe the removal of <br /> buried stnictures, such as undergrouncl utilitics, wells, or fomidations, obse���e the proof <br /> ia rolling operations, and to vcrify diat that the exposcd subgradc has been prepared in <br /> accordance �vith the Srrbgrnde Prc pnrntion scction of this report. <br /> ` 6.2 Sh•uctural rill aud Compaction <br /> Tlic tiillo���ing sections present our recommendations for compaction and placement oY <br /> su�uclural lill. <br /> , 1-�o.u.nzz3u5 <br />