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<br />. <br /> <br />Woodward.Clyde Consultants <br /> <br />1002 <br /> <br />. <br /> <br />indicate incipient piping. However, the analyses also <br />indicated that relief wells can reduce exit gradients to about <br /> <br />0.24 in the vicinity of the termination of the slurry trench. <br /> <br />. <br /> <br />However, the slurry wall must be properly constructed and the <br /> <br />relief wells must be properly designed, monitored and <br /> <br />maintained. <br /> <br />. <br /> <br />We understand that the main focus of future analyses will <br /> <br />be to assess the transient aspects of the upstream and <br /> <br />downstream boundary conditions on the exit gradients and relief <br /> <br />. <br /> <br />wells. That is, the upstream condition will be that which will <br /> <br />simulate the head associated with the inflow design flood. The <br /> <br />real head is to be calculated on the downstream portion of the <br /> <br />. <br /> <br />model as opposed to assuming the head is at land surface. We <br /> <br />do not agree with this approach and believe that the present <br /> <br />assumption of steady state conditions at maximum reservoir <br /> <br />. <br /> <br />level should be adhered to. <br /> <br />We believe that some consideration should be given to the <br /> <br />probability of construction imperfections in the slurry trench <br /> <br />. <br /> <br />cutoff. Our comments on the efficacy of a slurry trench from <br /> <br />the standpoint of possible construction imperfections and <br /> <br />associated seepage profiles are included in the following Part <br /> <br />. <br /> <br />4 of this section. <br /> <br />3. Considerations of Seepage at Right Abutment <br /> <br />The Bureau planned termination of the slurry trench is at <br /> <br />. <br /> <br />about Station 231, where ground surface is about elevation <br /> <br />- 23 - <br /> <br />. <br /> <br />ID. <br />~ <br />