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Stability of the side slopes for the temporary clearwater ditches will be evaluated with the same <br />procedures used for the haul roads, described in Section 4.7.2. <br />7.3 Monitoring Plan <br />A monitoring plan for determining the geotechnical characteristics of the future refuse material and <br />for general monitoring of seepage and stability conditions within the refuse pile are described in the <br />following sections. <br />7.3.1 Refuse Geotechnical Characteristics <br />As discussed in Section 2.2.3.3, it is anticipated that testing will be performed on refuse material <br />after the CPP operations commence. This testing will be performed to verify that the material going <br />into the refuse pile is indeed more favorable from a geotechnical standpoint than the minimum <br />criteria established for the refuse pile design in Section 2.2. While the criteria primarily relate to <br />shear strength, the permeability and unit weight characteristics will also play a role in the stability of <br />the refuse pile. <br />It is anticipated that samples of the CPP refuse material will be collected at the plant in the initial <br />stages of operation to better characterize the material and to confirm that the geotechnical parameters <br />of the material are similar to those used for the design. Characteristics might include, but are not <br />limited to, grain size, moisture content, and Atterberg limits (mineralogy) in addition to shear <br />strength, permeability, and consolidation tests. The time frame for initial sampling and testing is <br />expected to be in the first six months of the CPP operation. Additional periodic sampling and review <br />should be performed approximately every six months for the first two years of operation. After the <br />first two years, additional testing may not be needed if refuse material has been reasonably uniform. <br />Sampling and testing should be undertaken when there is a visible change in the characteristics of the <br />refuse. <br />In addition to the properties of the refuse material described above, it will be important to <br />characterize the material in its in -situ state within the refuse pile after placement. Thus, collecting <br />both disturbed and undisturbed samples of the compacted refuse material and performing laboratory <br />tests on the material will provide parameters which can be compared to those for the preliminary <br />material used for permitting /design purposes. Soil borings along with in -situ testing for shear <br />strength and permeability will be the likely method for sampling and testing the material in its in -situ <br />state. Furthermore, it is expected that the material will be sampled and tested within the first two <br />years after commencement of operations. <br />P \Mpls \06 CO \26 \06261003 RPE E Permit Mod Support \WorkFiles \Permit Apphcation \Text \Exhibit 82 RPEE design 2011 -07 -21 TR 127 doc 35 <br />