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0 Section 2 <br />Investigation Approach and Activities <br />The investigation approach for this evaluation is described in detail in Development <br />Rock, Ore, and Soil Characterization Data Collection Work Plan (CDM 2008). This section <br />summarizes the investigation approach and activities completed at the Van 4 Mine to <br />evaluate metals concentrations and physical properties of mine development rock, <br />ore, and soils. <br />2.1 Field Sampling <br />This section presents field sampling activities for development rock and ore, <br />background soil, and native soil underlying development rock stockpiles. <br />2.1.1 Development Rock Samples <br />The development rock pile at the Van 4 Mine was sampled via trenching in August <br />2008. A total of three trenches were completed and three samples (WRV4-1 to WRV4- <br />3) were collected from the development rock pile. Maps showing the location of the <br />trenches are shown in Figure 2-1 and photographs of the trenches and sampling <br />activities are included in Attachment 2. <br />2.1.2 Background Soil Samples <br />Two background soil samples were collected in areas upslope from the existing mine <br />is facilities to estimate background metal concentrations. Background soil samples were <br />collected by hand using a trowel at a relatively shallow depth of 0 to 12 in. The <br />background soils samples were collected approximately 1,000 feet north of areas of <br />surface mine disturbance. The location of these samples is shown on Figure 2-1. <br />2.1.3 Native Soil Underlying Development Rock Stockpiles <br />One native surface and subsurface soil/ rock sample located near each the <br />development rock area was also collected. This soil sample facilitates assessment of <br />soil underlying the development rock areas, which may be in contact with seepage <br />from the development rock areas. These samples were collected from natural soils <br />located adjacent to the development rock storage facilities to provide a sample <br />representative of soils underlying the stockpiles. The location of this samples is also <br />shown on Figure 2-1. <br />2.2 Laboratory Analyses <br />In order to understand the potential for acid- or toxic forming materials to be present <br />at the Van 4 Mine, laboratory analyses were completed to evaluate: <br />¦ Acid-forming potential; <br />¦ Total metals content; <br />¦ Meteoric Water Mobility Procedure (MWMP); <br />• <br />2-1 <br />7:\64986-Denison Mines\Ta