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<br />t <br /> <br />Woodward.Clyde Consultants <br /> <br />t <br /> <br />.. _ ("~:j ~ <br />t.0b'..); <br />the general right abutment foundation area (Ref.2). The <br /> <br />estimated range of low plasticity foundation soils is shown on <br /> <br />the Density vs. Liquid Limit chart, Figure 9. A significant <br /> <br />portion of the range falls within an area of soils sensitive to <br /> <br /> <br />soil structure collapse when saturated. D~to the low density <br /> <br /> <br />condition of the aeloian and alluvial ~~lS overlying the <br /> <br /> <br />Pierre formation in the dam foundat~~~le settlement <br />of the foundation can be anticipated from the w~~ht of the dam <br />I) '" <br /> <br />and future saturation. Thus, w~elieve that there could be <br /> <br /> <br />some risk of embankment crac~~we recommend the Bureau give <br /> <br /> <br />consideration to this risk i~thei~mbankment design as well <br /> <br /> <br />as possible foundation treatmen~~nstance, it will <br /> <br />r-- V <br />probably be advantageous to prac the embankment materials at <br /> <br /> <br />greater plasticity. ~ <br />In our ju~ement, these l~ density conditions will result <br />- -----i:rr.a--rat:heT-t~a/'~t'ed- c~i si-on-value,-Cs-;---TnepermeaoTnty-- - --" <br />of this materfal is~te high. Vertical and horizontal <br />permeabi~~ry v~~esfimated from field tests for the Bureau's <br />seepag1nalYSiS ~e ~wn on Figure 7 (Bureau's drawing No. <br />553-'~8). ThJ Jtrength and other physical parameters we <br />selected ~g~Ve~in Table 2. <br />V <br /> <br /> <br />t <br /> <br />. <br /> <br />t <br /> <br />t <br /> <br />t <br /> <br /> <br />. <br /> <br />t <br /> <br />t <br /> <br />- 15 - <br /> <br />t <br /> <br />~ <br />... <br />