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Snn Luu Projcct - Phue n Raise I expansion Conawetion Stator Report <br />' year. Utilizing an average head on the liner of 1.8 ft., the total seepage throl~gh liner holes or <br />flaws reduces to 52.6 gallons per year. Table 1 presents the results of a parametric study of <br />potential seepage rates. These seepage rates calculations assume a drain layer permeability of <br />2 x 10'" crn/sec as indicated by the field permeability test results. Utilizing a higher <br />permeability, such as those indicated by the preliminary results of the laboratory permeability <br />tests on the drain layer material, will result in a substantial decrease in calculated seepage rates. <br />Seepage rate calculations are contained in Appendu G. <br />TABLE 1 <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br />LJ <br />1 <br />Controlling Tailings <br />Permeability <br />(an/sec) Maximtno Head <br />on IT4.at <br />(ft) Avg. Head on <br />FMi, <br />(ft) Sub-base <br />permeability <br />(tin/sec) <br />Q hole <br />(gal/yr) <br />Q Wtslm <br />(gal/yr) <br />I x lOb 14.1 7 i x lOj 1.99 332 <br /> 5 x lP' 0.994 166 <br /> 1 x lP' 0.199 33.2 <br /> 5 x l0a 0.099 16.6 <br />S x 1P' 10.0 5 l x 10' 1.45 237 <br /> 5 x lP' 0.71 118.6 <br /> 1 x 1P' 0.14 23.7 <br /> 5 x 10a 0.071 I1.9 <br />I x 1P' 4.5 2.3 1 x 10' 0.65 109.1 <br /> 5 x lP' 0.33 54.5 <br /> 1 x 1P' 0.07 10.9 <br /> 5 x 10' 0.03 5.5 <br />5 x 10a 3.2 1.6 l x l0" 0.45 75.9 <br /> 5 x lP' 0.23 37.9 <br /> 1 x lP' 0.05 7.6 <br /> 5 x 10a 0.02 3.8 <br />' (l) Based on a drain blanket permeability of 2 x 10° cm/sec and a drain pipe spacing of 40 R. <br />(2) Based oa a total of 167 acres for the impoundment. <br />' Based on the potential seepage calculations utiliriag actual data developed to date, the seepage From the facility is <br />calculated as less than previously considered. Assumes entire drain blanket from Phase [ and Il has characteristitx <br />of material tested during Phan II. <br />October, 1993 21 SRK Project No. 14723 <br />