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<br />. <br /> <br />. <br /> <br />. <br /> <br />.' 1'1,. <br /> <br />UU3212 <br /> <br />treatments would require that the cross section be shaped on a 2:1 side <br /> <br /> <br />slope with a variable base width. A small amount of bentonite could be <br /> <br /> <br />add-mixed with the compacted earth process in order to insure a more <br /> <br />impermeable boundary. The ten mill PVC should be covered with 12 inches <br /> <br /> <br />of compacted earth as well as the 1/4-inch thick/catalytic blown asphalt. <br /> <br />The 3-1/2 inch thick unrein forced concrete section would be a trapezoidal <br /> <br /> <br />cross section having side slopes of 1-1/2:1, <br /> <br />The costs enumerated in this table are current estimates and would <br /> <br /> <br />be expected to inflate with time, These costs do not reflect the addi- <br /> <br /> <br />tional work that may be required for hydraulic structures such as turnouts, <br /> <br /> <br />drop structures, and gates and values, <br /> <br />-55- <br />