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<br />. <br /> <br />Woodward.Clyde Consultants <br /> <br />. <br /> <br />1005 <br /> <br /> <br />adequate penetration into the cutoff trench backfill, proper <br /> <br /> <br />design and specifications for the slurry trench construction <br /> <br /> <br />and slurry materials, and using great care during construction <br /> <br /> <br />of the slurry trench, monitored by close construction control. <br /> <br /> <br />By having the slurry trench penetrate into the Zone 1 <br /> <br /> <br />impervious cutoff trench backfill the risk of separation would <br /> <br /> <br />be reduced. <br /> <br /> <br />We believe additional borings should be made along the <br /> <br /> <br />selected slurry trench alignment to provide more data for <br /> <br /> <br />characterization of the soils that will be excavated for the <br /> <br /> <br />trench, to record undulations in the Pierre surface, and to <br /> <br /> <br />document the quality of the top ten feet of the siltstone of <br /> <br /> <br />the Pierre formation. <br /> <br />. <br /> <br />t <br /> <br />t <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />- 26 - <br /> <br />. <br /> <br />fI <br />