4719 BELVEDERE AVE 2016-01-01 MF Import

Junc 28, 206 Dnvid nnd ludy King L&A Job No. GA076 Page 4 7'hc Bsperancc S�md soil unit is consistcd of advancc ouhvash sarid scdimcnts from proglacinl tluvinl vid lacuslrine Jeposits laid do��i by slow-moving meltwater strcams Gom the advuncing but diste�t Vashon glacier. It is gencrally composeJ of light-brown to light-gray, wcll-sortcd, fino-to-medium-grained sand. 'Ihe Gsperance Sand member may include lenses of thin silt or coarse sand and small gravcl locally. In confined situations, the Gsperancc Sand soils ure gencrally in dense to very dense state. '1'he Lsperance Sand deposits, howevcr, can subject mther cusily to rainwash crosion and gullying, anJ may looscn up nnd slough to its ungle of repose where they aze exposcd on slopes or cuts nnd devoid of vegetation cover. The Esperance Sand soils arc yuitc permcable and are oRcn saturatcd at the basc �vhcre it is underlain by a impervio�u practically impervious fine sandy sill to clayey silt deposit of the R'hidbcy formation. 'Ilic Whidbcy fomiation, nonnally undcrlying the Gsperancc Sand mcmbcr, is consistcd of non- glacial rivcr Ilood-plain dcposits. It is composed of light-brown to gmy, finc-sandy silt to claycy silt wit� occysional tinc gravcl. Thc Whidbcy fortnation is gencrally vcry stiff to hard in its andisturbed nati��e statc. It is of extremely low pemicability and tends ro perch groundwnter. Groundwatcr sccpagc nRcn cmcrges out of slopcs and cuts whcrc thc Whidbcy fortnation is cxposed. When Uic secpage pressure is high in the wet ��intcr munths, the emerging groundwatcr can croJe thc soils in and above thc secpage zonc of poor vcgetation cover, und causc the ovcrlying soils to slough and collapsc. SUIiSURFACF. CONDITIONS Subsurface conditions ir the arca of thc pruposed new resiJcnce to be constrvGed on thc northem lot wcre explored on June 13, 2006, with thrce test borings drilleJ with a portable drill rig owncJ mid operated by CN Drilling. 'I'he npproximate locations of the test borings are sho�cn on Platc 2- Sitc and Gxplorntion I.ocation Plan. The tcst borings wem drilled to depths from 1 I.5 to 21.5 fect. Soil samples obtaincd from the test borings wcre visually classified in general accordance with l.Jnited Soil Classification Syslem, a copy of which is presented on Plate 3. A LIU & ASSOCIATCS,INC. S�