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5.0 PHASE 4 EVALUATION <br /> 5.1 INTRODUCTION <br /> Based upon our discussion with the Sunnyside staff, it was determined that <br /> the most available material for construction of a berm on the downstream side <br /> of the embankment would be the alluvial and colluvial soils located immediately <br /> behind Tailing Pond No. 4. At this time, we requested that the Sunnyside Gold <br /> staff supply us with a suitable amount of this material to comprise a represen- <br /> tative sample for laboratory testing. We also requested that we be provided , <br /> with adequate survey data, topographic mapping and material quantity generation 3 <br />` data from the mill to allow us to analyze the actual geometric constraints in <br /> more detail. We received the soil sample and a portion of the maps requested; <br /> however, we understand that more detailed map coverage of the tailing pond and <br /> Itailing volume generation data was not available to us. At this point, we <br /> initiated the Phase 4 evaluation as discussed below. <br /> 5.2 ENGINEERING PROPERTIES OF MATERIALS <br /> 5.2.1 Soils <br /> Laboratory testing of the soil sample provided to us was conducted to <br /> determine its suitability for use as structural fill to construct the toe berm <br /> trequired. The laboratory tests performed included: mechanical sieve analysis, <br /> Atterberg limits, modified Proctor moisture-density relationship, constant head <br /> permeability and consolidated, undrained triaxial compression with pore <br /> pressure measurements. The test results are shown of Figures 19 through 21 and <br /> i <br /> Table 1. <br /> -28- . <br />