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2.05.3 <br />Conductivity specification of 1x10 "' cm /sec, the native soils are proposed to be <br />amended with bentonite. Huddleston -Berry Engineering and Testing (HBET), or <br />another approved Geotechnical firm will complete a mix design to establish the <br />percentage of bentonite required to be blended into the native soils in order to <br />meet the Hydraulic Conductivity specification. Subsequently, the full suite of <br />testing outlined in Exhibit 20, Table 1 will be completed on the blended material to <br />be used for the liner construction. If bentonite is to be used, it will be obtained <br />off -site and the blended liner will be 12- inches thick. <br />During installation, in order to ensure the soil liner will perform as designed, <br />construction materials testing will be conducted by qualified engineering <br />technicians under the direction of a Field Testing Services Manager and /or <br />Project Engineer. Prior to liner construction, the subgrade will be evaluated to <br />ensure that it is free of unsuitable materials. In addition, a geotechincal engineer <br />will observe proofrolling of the subgrade to ensure subgrade stability in <br />accordance with referenced Solid Waste Guidance Document, as incorporated in <br />Exhibit 20. Subsequent to proofrolling, but prior to liner placement, a <br />geotechnical engineer will verify that subgrade is properly scarified. In <br />accordance with the referenced Solid Waste Guidance Document, materials <br />testing during liner construction for ponds 1 -3 will be conducted as summarized <br />in Exhibit 20, Tables 2 - 4. <br />Twelve inches of native soil will be used as a liner cover in order to prevent <br />cracking of the liner, and damage during sediment cleanout. The soil cover will <br />be compacted until it attains at least 90% of the maximum dry density attained in <br />a laboratory compaction test in accordance with ASTM D698. Compaction <br />testing will be taken at a frequency and location of not less than one per every <br />other layer, at random locations across the ponds. <br />The following table presents the elevation of the pond bottoms and projected <br />ground water elevation. Groundwater elevations are presented on Figure 2 in <br />Exhibit 14. Pond bottom elevations are shown on Map 13. <br />Permit Application 2.05 -19 01/12 <br />