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<br />f(O <br /> <br />l( <br /> <br />C~ <br />~ <br />~ <br /> <br />19 <br /> <br />'.-' <br /> <br />r~~ <br /> <br />TABLE 7-1: Thickness and Permeability of Soil/Bedrock Units <br /> <br /> Depth Permeability <br />Area Unit (ft) (cm/sec) (in/hr) <br />East and Overburden 0-18 3.8 x 10-4 0.539 <br />West Weathered Shale 18-60 1.5 x 10-4 0.213 <br /> Shale >60 1.0 x 10-6 0.001 <br />Middle Overburden 0-10 1.0 x 10-4 0.142 <br /> Weathered Shale 10-60 1.6 x 10-6 0.002 <br /> Shale >!,O 1.0 x 10-6 0.001 <br /> <br />Several assumptions went into the seepage estimates as <br />follows: <br /> <br />o Steady state seepage <br /> <br />o Vertical permeability does not change once the shale is <br />encountered, i.e., k = 1.0 x 10-6 cm/sec (0.001 in/hr) <br />controls the long term seepage rate through the bottom of <br />the ponds <br /> <br />o Conditions are uniform over the areas <br /> <br />o The ponds contain an average depth of water of 5 feet <br />year around <br /> <br />o ~aline water impacts were ignored because no data was <br />available to suggest what these effects might be <br /> <br />o The effects of the build up of salt on the bottom of the <br />ponds was ignored <br /> <br />Given these assumptions and the average values in Table 7-1, the <br />seepage rates presented in Table 7-2 were estimated. <br /> <br />TABLE 7-2: Preliminary Seepage Estimates <br /> <br /> Lateral Seepage Vertical Seepage Total Seepage <br /> Area (gpm) (ft3/ft2 day) (gpm) (ft3/ft2 day) (gpm) (ft3/ft2 day) <br /> West 300 o .00 11 760 0.0029 1,060 0.0040 <br /> Middle 30 0.0002 440 0.0029 470 0.0031 <br />lc East 340 o .00 10 990 0.0029 1,330 0.0039 <br />