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-4- <br /> d. Ensure that the drainage layer, <br /> has, as a minimum, the following <br /> characteristics: <br /> 1) Twelve inch thickness <br /> 2) Hydraulic conductivity of <br /> 1 x 10-2 cm/sec <br /> 3) Final slope of at least 2% <br /> (after settlement) . <br /> e. Provide details of the proposed <br /> drainage system, from the drainage <br /> layer to the water treatment <br /> system, and include provisions for <br /> inspection of the drainage system <br /> weekly and after major storms. <br /> f. Provide procedures which document <br /> that the owner or operator shall <br /> comply with prescribed sampling, <br /> testing and reporting when <br /> installing the cover. Testing of <br /> the compacted barrier layer should <br /> include a field test of the fill, <br /> to allow verification of density <br /> and permeability, prior to use of <br /> the fill in the impoundment. Test <br /> fill should consist of at least <br /> three six-inch lifts of compacted <br /> soil and a drainage layer. <br /> 16 a. Submit detailed plans and an <br /> engineering report describing the <br /> method of removing and treating <br /> the free liquid wastes. <br /> b. The expected year of closure is <br /> indicated as 1986; from the work <br /> schedule, it appears that the <br /> closure year should be 1987. <br /> 20 Closure schedule does not allow <br /> any time for "17(7). Construction <br /> of drainage controls" (It is <br /> assumed that this is a simultaneous <br /> action) <br /> 0 <br />