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� 'Z�A Propused Immanuel Lutheran Church Additlon
<br /> ,,, �� 1-1788-3
<br /> ` � �� �ebruary 23, 2005
<br /> i � Page 4
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<br /> � G.1 Sitc Preparation
<br /> We offer the following recommendatiens and conunents lor gcneral site prepur.�tion.
<br /> � Gxisting Structure Removal: Any cxisting undergrennd structures (e.g., septic tanks, ���ells,
<br /> pipelinr.s, foundations, utilitics, etc.) shou!d !;e rcmoved, relocated, or abandrnicd, as
<br /> �� necessary, in accordancc with all local, state and federal regulations. Localiud cxcavations
<br /> made tiir removal of structures, utilities, and thc removal of unsuitable till materials (if
<br /> encountered) shouid be prepared in accordance �viU� the Subgrade Prepnr�tion section ofthis
<br /> �� reporL Overexcavations should be backfillecl �vith sUvctural flll matcria! placed and
<br /> compacted in accordance with Uie Fill Plncemer;t and Canpnctia� Cri�erra scctions of this
<br /> repori. Utilities outsicle the building envclope could be abandoned in place, provided they are
<br /> !� fully grauted wilh control density fill (CDF) and the trcnch backfill is dcnsity tesled to verify
<br /> ' that it meets the compaction levels spe��`�ed in this report.
<br /> Site Drainat;e: Stripping, excavation, grading, and subbrudc preparation shotdd bc �crfornied
<br /> in a manner and scquencc that will providc drainage nt all times an�l providc proper controi uf
<br /> erosion. Accumulatcd watcr must Ue removcd from suUgradcs mid �vork arcas immcdiately,
<br /> o: allowed to suhstantially drain, prior to perforn�ing furthcr work in thc arca. �quipmcnt
<br /> access mav be limited and tlic amount of soil rendered unfit for use as stn�ctural fill may bc
<br /> grcatly increascd if drainage efforts are nat accomplished in a timcly sequcnce.
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<br /> Clearin� and Stripnin�:: The conslntction areas should Ue cleared and stripped of all
<br /> � ��egetation, trees, bushes, sod, organic-rieh topsoil (soils with 5 percent or more ocganics),
<br /> artificial 1ill, debris, asphalt, concrete and oUicr deleterious material prior to fill placement.
<br /> Densc vcgctation, grass and ils associ�tcd root systcm, as wcll as an organio-rich topsoil laycr
<br /> ' wcrc encauntercd during our exploration program. In the vegctated arcas, ���c estimate the
<br /> depth of required stripping to removc organics to be approximately 6 indies, with some
<br /> deeper siripping in localired areas. Auditional organics, sucl� as root halls or organic ricl�
<br /> ' soil, may necd to bc removed. Aclual removal depths should be detennined by a qualified
<br /> gcotc ,hnical cnginccr at thc timc of grading based on thc subgradc matcrial's organic contcnt
<br /> and stability. Dceper stripping is typically required during wet site conditions to remo��c wet
<br /> ; or disturbeJ ncar-surtacc soils.
<br /> On-Sitc Soil Considcrauiuns - GeneraL• Thc subsurface soil conditions encountered during
<br /> � our cx �loration �ro ram consisted enerall of a cla , mandin � a cla e �, silt sand Vashon
<br /> � ( l b S Y Y b " Y ) Y �
<br /> till); thcrcforc, ti�esc soils arc ��ery scnsiti��c to moisture. If construction activities take nlacc
<br /> � during extended wet wcatlier periods, tlte site soils could Uecome soft, yiclding, or unablc to
<br /> � be compacted to rcquired criteri�. Tl�v unstab►c soils may nccd to be rcmoved in order ro
<br /> achicvc the reconuncndcd compaction Icvcls.
<br /> I On-Site Soil Consideralinns - AVet Weatlier: In the event the ezposed subgrade becomes sofi,
<br /> yielding, or unable to he compacted due ro high moisture conditions, �ve mcommend tliat thc
<br /> construction irai7ic should bc restrictcd lo dcdic��tcd dri��eway and IayJown arcas. If sitc
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