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-lz- <br />and a positive cutoff trench excavate:] intc Lrodrock. 3asad on our ~ <br />analyses, ee believe Ponds 2A and 3 ;+ill also have satisfactory safety <br />factory under all loadirrls 'for these asyume.9 conditions. p 2.5:1 1 <br />downstream slope is suitably for use in all of these embank,~ent <br />sections. <br />At Pond 2A, the highly ::eathere~ roal sea~a encountered near. the <br />do~mstream toe si~ould be re:xwed. Lateral extent of rei:aval, shotrr, on <br />Fig. 4, should be to ca:~perent material determined at ti-~e of excava- <br />lion. Careful inspection should to performed ~urirxl mn~truction to <br />define any material changes cr othar ~ror.ditions ;~hich nay a;iversely <br />affect the overall stability. <br />• xttlement: tiaximum foundation settlement is c:ai:;ated to h^ a.~ut <br />2 to 4 inches, which should essentially occur during construction. <br />:his decree of settle;,;ent is realigible for an earth anhancr~ent <br />structure, and essentially no camber of the outlat work:, or <br />overbuilding of the er;ubarknent section will be re~~uir2a. Following <br />cronstruction, some additional differential settlement could also occur <br />as foundation soils become wetted 'out should net be detrimental to the <br />embank.nent structure. Cut and fill transitions shoul:'. be :~.a;?o slowing <br />to minimize the effects of differential settlement. <br />Seepage: Eased on the procosed embanlc~ent sections,•impoundment depths <br />and shallow depth to bedrock, all embanlmient structures should be <br />constructed with a continuous impervious cutoff trench ir~to~competent <br />bedrock. Ponds ?A and 4 shoul3 also to provide3 with a tce and blanket <br />• drain to draw off potential seepage. Details of these drains should be <br />