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12-0a-1997 9 = eiaa~ FROF1 ENG. WELT ELK nl l NE 97[n 9295QSD P. 25 <br />NOV 6'97 15:9 FR BARB ENGINEERING 612 832 2691 TO 9295595--0626016 P.g6i10 <br />• <br />Ta Nxm &v~ry <br />-><os: P6i6p B. 9el~eg9 <br />sr~u)~ w.d sup w~->;- <br />raw NoveIDLR & 1997 <br />oa~~ww~o~ P,~3 <br />pressure measurements on samples from I-6. Perform residual strength <br />testa acing the direct shear test device on samples from i-7 and W-1C. <br />Perform moisture oonteat, grain size and Atterberg limit tests on all <br />triazaal and direct shear test samples. Consider performing s swell test <br />using the odometer on samples for I-7 sad T-6 (upper failure plane) to <br />determine the eapansive pressure of the soil sad its potential to cause <br />S1plift'. <br />(d) Evaluate the potential for water recharge 1i~om water "trapped" within <br />the substation retaining walls and upslope of the portal sheetpile wall <br />and determine methods to dewater such as horizontal drains. <br />(e) Evaluate the need for and the methods to drain water being "dammed" <br />by the 511 just ups]ope from the freshwater pond. <br />The above-mentioned action items will be used to stabilize and assess other <br />stabilization methods along cross section A-A. Based upon the assessment of the <br />stabilization methods at cross section A-A, the entire landslide stabilization <br />program w171 be determined. The approach is to clearly uadesataad the mechanics <br />of the landslide at cross section A-A and apply tfris knowledge to the stabilization <br />of the remaining landslide area. <br />Schedule <br />1. Vertical pumping well at substation near W-1D and W-lE: <br />(a) pending permit-begin by Nov. 10 and complete by Dec. 1, 1997 <br />OBR9014\W861.LCS7 <br />