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t <br /> � \1�e undar,:un�l thc I�n�c,� �lni,hr.l Il����r cic�utiun ��f the :A�utc r_�an: Tu��cr ��ill hc ap��rn.�imatch <br /> f:lc��;itiun 83 and thc lo�a�cst finishcd ilour of the garagu ���ill bc appro�imatch� L k��ation 63 t�ct. ;�hi; <br /> � will rcquire exc:nations at the si[e un the order of�0 feet on the ��'est side und �40 fect on the east ;i�ic. <br /> l�criporarv shoring «'ill be required alone the nuijori[y of the escavation. Open cut slopes ma� be <br /> fcasible on thc cas[ side of tl�e parking garaee dcpcndine on sitc constraints. Onderpinnims and la;cr;�l <br /> � support of thc c�is'[ing hospitul and MOD �+'ill �ilso bc rcquircd. Fuund;ui�,n; are ;inticipmcd tn a,n,i,t �,I <br /> a combination of m�t (uund:itiuns and shallo�v sprend foundations. <br /> p GEOLOGY <br /> 4 Our revic�c of lhc USGS eeulugic map, Gcologic Map of the I:cer�tt t)uudran-l�. Snohumish Cuunt��. <br /> 1 1Vashington by Jemes P. Minard indic;ucs tha[ surlicial soils at thc sitc consist primarily of !!Iacial till <br /> overlying ndvance ounvash and older deposits of the AVhidbcy Pormation. Glar,ial till typically consists uf <br /> a hetcrogcncous mis�urc o( s;md. cravcl, cobblcs �md occasional bouldcrs in a silt and cla�' matrix that <br /> � �vas dcpositcd bcncadt a glacicr. Thc advance outwash consists of mosdy gr:�y, �tcll-s[ratificd .',and ��ith <br /> variablc amow�ts o(silt, pcbblcs, and cobbles. "�he advancc out�oash sanJ is usuall� esposed where thc <br /> overlying claci�l till cap h;is heen eroded awa}, t�'pir�lh� in ra�inzs ancl bb.iff mnrzins. The 1Vhidbe�' <br /> � '�urnuuion typically consists of dciisc sands and gra�cls ovcrl�ing or intcrbeddcd �aith stitt�ro harJ silu. <br /> .All uf these cfeposits ha�c becn glacially ovenidden and therefure have hi�h shcur strcneth and low <br /> compressibilih cheract�ri,tics. <br /> � A tone of wcatliered till rypically overlics thc dense glacial till to dcpths uf 2 ro 1G feeL ��his �wathercd <br /> zone is somcwh;u draincd. ��hcrc.i; the umvc:uhcrcd till is a 6;irricr to �trtical drainage. \Yuter <br /> percol:lling into the ��eathcrcd till ��ill usuulh� pond nnd miu'ute latcralh- bch��ccn the �vcathercd :md <br /> � w�weathered zones. <br /> SubsurLicc soil conditiun; uncuuntcrcd in our burings arc consistcnt ��'ith thc ^cologic mappin,. In <br /> � �,eneral. �ec encuuntered n thin I:rv'er uf lill overlying ��laci:il [ill to dep[hs ramzin�� from 3� to �l� feet. <br /> �'cry densc advance out��ash s;mJ underlics the gl�cial till. Very dense silt�' s:mJ ;md hard sil[ ��'as <br /> encountcrcd at Jepth in the �ti'estcm portion uf the site (dcposits of dr: 1Vhidbe� Permation). Detailed <br /> � dcscriptiuns arc provided in thc Pollo�vin!! s'cction. <br /> � SITE CONDITIONS <br /> � SURFACE CONDITIONS <br /> � fh� projcc.t sitc is currcnth occupicd by :�n existin�� parking earage. Rockefcller .-�venue, and a sta��ine <br /> �� vnrd and grn�'cl purkin, area utilited ('or construc[ion of tlic C:mcer Care C'enter. Rockefeller Avenue <br /> �cill be �'acated brnv�en 13th and I-lth Strect to accommudate the .-\cute Care To�vrr. The east arca of the <br /> � ;itr also contains bios��alcs and tcmparnrq detention for sediment and erusion con[rol associated ��'itii <br /> recent demolition �vork in 131ock '_'-13. C�is[ing iite fe�[ures and locatiun of[he proposed builJint�s are <br /> presentcd in the Site Pl.m. I�i!:w'e "_'. <br /> ! I'he project site slupes duwmvard to the e;tst From the e�istin�, liospital. lhe ezistine ground surGice <br /> � cic�;ition at the �rest end uf the site is approzimat�l� Elava[ion 130. �he e�isting !�rounJ surface at the <br /> c;is� cnd of thc iitc :ilon�O,iks :\�enue rang�s �i'om approximateh Clevation I03 to 109. <br /> S <br /> I <br /> I . . ;��_: .,�il�.r)il ��(l��� GEOENGiNEEAS� <br /> � i ,iv i�. _,�rx� <br />