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Technical Revision 25, Rev. I Schwartzwalder Mine <br /> 2.2.2 Soil Sampling <br /> Samples of surface soils at the mine were collected by Cotter in September 2008 to evaluate <br /> - residual uranium and radium concentrations. Sample locations included areas with potential <br /> impacts from mining operations as well as areas cleaned up in previous decommissioning efforts. <br /> Sampling locations were selected based on results of the gamma survey as well as relevant <br /> historical information. <br /> Soil samples were collected to a depth of 6 inches (15 cm), spatially located by GPS, and <br /> analyzed in the field by x-ray fluorescence (XRF), a screening technology used to estimate <br /> concentrations of metals in soil (e.g. uranium). Samples were then packaged <br /> g ) p p ged and sent to a <br /> commercial lab for analysis. For all samples, particles larger than inch were excluded. For <br /> three samples, aliquots representing all particle size fractions ("as-is" samples) were also <br /> analyzed. In addition, concrete foundations were cored to allow sampling of concrete and <br /> underlying soils. Uranium was not detected in any of the concrete samples. The results of the soil <br /> analyses are presented in Table 2-1. <br /> Table 2-1: Soil Radiological Analysis Results <br /> Sample Sample Location Description Uranium Radium-226 <br /> Number Ci/ Ci/ <br /> #4 NE Water Treatment Plant 15.8 10.7 <br /> #5 East Retention Pond, South Side 88 64.6 <br /> #6 East Retention Pond, North Side 29.5 15.3 <br /> #7 South Retention Pond, North 23.8 17.8 <br /> #7 as-is 55.6 32 <br /> #8 South Middle Retention Pond, North 32.7 8.5 <br /> #9 Pit, East Water Treatment Plant 1.7 0.7 <br /> #10 East of Retention Pond, North 69.7 61.9 <br /> #11 East Centerline Retention Ponds 73.8 7 <br /> #12 East Centerline Retention Ponds 247.1 108 <br /> -- #12 as-is 211.9 136 <br /> #13 Road West Boneyard 2.6 1.2 <br /> #14A Road at MW#00 3 1.4 <br /> #1413 Road at MW#00 (Duplicate) 2.6 2.1 <br /> #15 Road, Start of Waste Pile 130.7 12 <br /> #16 Road South Waste Pile 46.3 13.6 <br /> #17 Road at MW#0 228.1 128 <br /> #18 Across Creek Old Boneyard 5.2 2 <br /> #19 South of MW#2 1.2 0.4 <br /> #20 Along Creek Bank NW of MW#3A 3.6 1.1 <br /> Mine Permit M-1977-300 <br /> Cotter Corporation(N.S.L.) 7 June 2017 <br />