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IZZA Proposed Immanuel Lutheran Church AddiNon <br /> � � 1-1768•3 <br /> February 23, 2005 <br /> '�— Page 2 <br /> � A gcneral description of the suUs�rface conditions encountered during our exploration program is <br /> presentcd in thc SubsurJace Soil Condilions sect��n of this report. Ap�,^ndix A includes <br /> � descrip�ivc Uoiing logs of thc subsurface explorations and the procedures utilized in the <br /> subsuriacc cxploration program. <br /> ;� 5electcd soil samples obtained during our exploration program wcre tested in the IaUoratory to <br /> evaluate thc pertinent physical and engincering properties of the soils. The results o}' our <br /> laboratory tescs and a description of the testing procedures are encloseJ in Appendix I3. <br /> i <br /> S.0 Suitrnc���N�>Suusu►a�,�cr.Co�nrrtoNs <br /> Tlic follo�ving scctions oCtcxt ��resent thc ecol<����. subsur�acc soil and uoir.iJw,�tcr conditions. <br /> '� seismicity and liqucfaction. <br /> 5.1 Publislicd Gcologic Litcrahn'c <br /> � 7�7C I�C�'I011il� ]�'CO�O�'y Of��1C 51(C 8I'l':1 AA'}I? I�CA Il'V`,'Cl� II1 1�1C (ri r�luPlt'N� .��d�� t�l /�li' �'.1'i'Pi'll , .J <br /> 1 <br /> Alim�le Qundrangle. S�tohomis/t C��tui(r. Il u.�lii�t,lun - .Sui�;liursr (h«��Ir��rit (\II -17-IS) <br /> � compiled in 1935 by Minard. Thc arca including tlie project site is classilicd as Qvt-Vashon <br /> "� Till deposits. The lili is a non-sortcd mixture of mud, sand, peUbles, coUbles .uut boulders <br /> � dcposited dircctly Uy thc ice as it advanced over Ucdrock. Subsurfare conditions as disclosed <br /> by tlie dcnsity conc penetromctcrs and hollow-slem auger borings continned thc presence af <br /> � tl�c soils dcscribcd on thc gcologic map, including silt and sand deposit�. <br /> ; 5.2 Subsarfacc Soil Conditions <br /> { Soil descriptions presentcd in th�s repoit are based on die subsurlace conJitions encountered <br /> at specific exploration iocations across thc site. Variations in subsurf:�ce conditions m;�y <br /> exist behveen lhc exploration lucations. ReCer to Uic [3oring Logs in Appendix A for a <br /> detailed description of Uie subsurfacc conditiun,. r\ generalized descrip�ion oC the soil <br /> condilions is presentcd bclo���. <br /> � In gencral, thc upper unc luut �•unsistcil oi c loosc to mcdiwn dcnsc, cr.t�clly sanJ ((ill). <br /> mantling a soti to hard, Ic�n clay �vith �'arying amounts oC sand, to dcpths of approxinu�tch� <br /> 4.5 feet bclow caisting gradcs. 1'his was undcrlain by dense to very dense snnd and silty sand <br /> ! with varyinb amounts of gravel (Vashon till) to the masimum deplh rxplored (approximatcly <br /> 16.5 and 21.0 lecl below existing grade). <br /> i <br /> ' S.3 Grounch��atcr Conditimts <br /> Ground�vater was not encountercd iu tlic borings or density cune prnetrumct�as (DCP) at thc <br /> I time of exploration tiir this stucly. We dicl encountcr a ���et �one in DCP 2A at an <br /> approxiiuutc depili of 4 fect, :�nd is most likely duc to a perched groand�valer condition abo��e <br /> thc densc Vashon till. It shuuld be noted that ground�vater conditions and soil moisture <br /> contents arc cxpected to vary ���ith changes in scason, precipitation, sitc utilization, and other <br /> on- and off-sitc factors. I�urihcnnorr. perchcd growid���ater conditions should bc expccled to <br /> � �Ir��rl�,�i fi,llu�cin��periods of��rolom�cd precipitntion. <br /> i <br /> �-�u.n.n���us <br />