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below the ground surface. Four -inch diameter drain lines are <br />recommended. <br />-46- <br />Since the actual quantities of water which may drain from the <br />pile are very difficult to predict and, based on the test results, it <br />seems possible that no gravity drainage will occur from the pile <br />during its temporary storage. For this reason, it may be possible to <br />defer the installation of the solid drain line from the leached rock <br />pile to the leaching facilities until operating experience <br />demonstrates the necessity for this line. <br />BERMS AND LINERS <br />Earth berms should be constructed around the storage tanks and <br />the acid storage facilities in order to contain spills. <br />Embankments less than 5 feet in height may be constructed with a <br />homogeneous cross - section at maximum slopes of 1.5 horizontal to <br />1 vertical. The material placed I the dikes should be the natural <br />on -site soils which meet the criteria presented in the Site Grading <br />section. <br />We understand that the Gates & Fox Company, Inc. plans to install <br />an elastomeric membrane system which will completely cover the <br />concrete on the inside face of the vats and the ground surface under <br />vats and on the inside of the berms adjacent to the product tanks. <br />elastomeric system, which is produced by Chevron, is called <br />trial Membrane System. Our investigation of this material <br />`es that it has very good characteristics for the intended use. <br />