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Scptembcr 23, 2007 <br />Mr. Jeff \Vhitney/[3rookstonc De��elopmcnt <br />[.&.r\ Job No. 7A084 <br />Pagc 2 <br />from previous soil sloughing. A timber bulkhead is constructed over the ���estcni suctch of this <br />slope to support a vcrtical Ioc cul,just ahove thc railroad track Ic��el. • <br />�'hc slopc is dot�cd �vith dense m�turc deciduous trees a��d shn�bs, intermi�ccl with occasional <br />evergrecn trecs. At ahout 5 to 12 feet ahove the roc of the slope is a band ot the slopc covered by <br />moisturo-secking horsctail bushcs, indicating thcrc is likcly groundwatcr sccpagc out of this b:�nd <br />of the slope. Some of thc mature Uees on the slope ha�e a bent near the basc of their lrunk. <br />indicatiug thc occurrence of soil tnovcmcnt many ycars ago. <br />Gcolugic Settin;! and Soil Conditions <br />Thc Gcologic �4a1� of thc Gast Gdmonds <md Part of Uie �'� cst Gdmonds OuadranL'�cS. <br />\Vashington, by J�mes P. \9inard, puUlished by U. S. Geological Survey in 1983, was refercnccd <br />for thc gcologic and soil condilions at thc residcncc silc. According to Ihis piiblicalion, the <br />sur(icial soil units at and in thc vicinit}� of thc subjcct properlics arc mappcd as Vashon Till (Q�.t1 <br />undc�i:iin hy VVhidbcy formation (Q��,). <br />7�hc gcolugy ol �hc Puget Sound Lowland has bcen modified by the ad�;mce .ind r�u'ea� of <br />scvcral glacicrs in thc past and subscqucnt deposits .md crosion. Thc latcsl glacicr advanccd to <br />thc Pugct Sound Lo�vland is rcfcrrcd to as thc Vashai Sladc of tlic I�raser Glacialion, which h��s <br />occurrcd during thc laler slagrs of thc Vleistoccrc I:poch and reUct�tcd I�rom �hc rcgion snmc <br />1 �1,500 yca�s ago. <br />"fhe Vashon till soil unil is deposited directly by glacial ice during the most recent glacial period <br />as il aJvanccd ovcr an crodcd, incgular surf:icc of oldcr formalions :lll(I SC(IIOII'IllS. I Ill' IIII SOIIti <br />ovcr the top iwo to four fcet is nornially �vcathcred tu a medimmdense slnle, and is moderately <br />����»�:,i,i� �„�i ��,�„r�«��i,i�. n,� ��„d��i}��„� r���si, ��u is n vci}'-densc mixturr, of unsortcd cl��y. <br />L[U & ASSOCIAT�S, INC. <br />