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r _ <br /> rr 1 <br /> 2P21386161-1 <br /> Adequate Levee <br /> Protection is a principal concern <br /> may be signiiCantl <br /> Y affected and levee stability <br /> channel) de by the presence of <br /> Localized <br /> I Posits of peat (filled <br /> be feasible to con Y or .loose sandy soils <br /> 4 however, <br /> tsruct any required it should <br /> identify, evaluate and levee improvements and to <br /> mitigate Ioca2 adverse <br /> Very loose sand soil conditions. <br /> Y 50115 as encountered in Boring-4 <br /> of materia <br /> _ is Commonly considered su zng 4 are in the <br /> induced liquefaction and the <br /> based to earthquake <br /> On w <br /> ma the e <br /> magnitudes ud maximum <br /> es i <br /> m <br /> ._ u <br /> and ground accelerations in m credible" earthquake <br /> ;. v a Potential source Table-I such <br /> °f Levee failure materials are <br /> '= considers under d <br /> ' d likely that such dynamic loading. It I <br /> of naturally Conditions is <br /> " .- Y backfilled are limited to locations <br /> channels--susce <br /> and r3efinition S .-Susceptible to identification <br /> through air- <br /> = and s Photo review, detailed site <br /> Ystematic subsurface <br /> explor,tion. to tOPography <br /> . limited lateral Given the <br /> extent and anticipated <br /> - in Boring-4 depth of the very loose s <br /> ({l5 It below oils encountered <br /> natural <br /> be effective) groundsurface <br /> _., y accessible to e ) such materials may <br /> excavation and replacement. <br /> u: Levee fills R <br /> encountered <br /> -mineral in the on-site <br /> soils .with borings are <br /> more than nominal generally <br /> f_.materials stre ~' <br /> ngth. <br /> and strength Assuming uniformity °. <br /> existing Leve -�' <br /> - s-table on at a sections. are <br /> least moderate slop expected to <br /> t0,, say, an increased o Pes and acceptable for wj <br /> r raised sedc.. <br /> levee incorporation &� <br /> �dges at Lev section. <br /> � . Disappointment Exploration <br /> Slough for ` } <br /> 9h and <br /> y'sncountered Eight Mile Road <br /> generally poorer at Bishop :@ ? <br /> on <br /> soils levee fill and <br /> Poor levee foun.- <br /> . _. to 5-lp ft below base of levee. ' <br /> a <br /> ^f <br />