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Hazeltine/Road Runners Rest IllBrinkmann-Woodward Gravel Pits Lining Project -Design Technical Memorandum <br />Denver Water <br />August 2003 <br />TABLE 4.3 <br />SUMMARY OF SEEPAGE ANALYSES RESULTS <br /> Computed Seepage Rate from Top of Soil-Bentonite Cutoff Wall to Indicated Depth <br />into Bedrock <br />ft'/da /lineal ft <br />Section 2 4 6 8 10 12 15 21 24 <br />1 2.6 0.9 0.7 0.6 0.6 0.5 - - - <br />2 3.9 2.9 2.2 1.3 1.0 0.9 0.8 - - <br />3 1.3 0.3 0.2 0.2 0.2 0.2 - - - <br />4 3.2 2.7 2.3 2.1 1.8 1.7 1.5 1.0 0.3 <br />5 2.4 2.0 1.7 1.5 1.3 1.0 - - - <br />6 0.4 0.3 0.3 0.2 0.2 0.1 - - - <br />Notes: <br />1. '=" Indicates seepage rate not computed for this depth <br />2. Indicates depth of cutoff wall in feet, below the top of bedrock <br />4.6 Factor of Safety Variation with Depth of Cutoff Wall <br />The results from the parametric study were used in amass-balance spreadsheet to develop soil- <br />bentonite cutoff wall depth designs for target factors of safety of 1.0, 1.4, 1.6, 1.8, 1.9, and 2.3 <br />against the SEO Design Standard. The mass balance spread sheets for these factors of safety <br />are provided in Appendix B. <br />A summary of bedrock penetrations along the wall alignment for the respective factors of <br />safety from the parametric study are shown in Table 4.4. The weighted average bedrock <br />penetration was computed by dividing the total square footage of the cutoff wall by the total <br />depth of wall, minus the square footage of cutoff wall to the top of bedrock, divided by the <br />wall depth to the top of bedrock. <br />TABLE 4.4 <br />BEDROCK PENETRATION SUMMARY <br /> <br />Factor of Safety Minimum Bedrock <br />Penetration <br />ft Maximum Bedrock <br />Penetration <br />ft Weighted Average <br />Bedrock Penetration <br />ft <br />1.03 3 5 3.5 <br />1.44 4 10 5.0 <br />1.56 4 10 5.7 <br />1.80 4 10 7.0 <br />1.88 4 12 8.7 <br />2.34 12.5 12.5 12.5 <br />GEI Consultants, Inc. 20 moso o;-m.a in-a~ric~r oa~.~,m <br />