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EXHIBIT B-4 <br /> Van Valkenburg Quarry NRCS Map Unit Description: Rock Land <br /> Map Unit Description:Rock land—Jackson County Area,Colorado SandRidge Exploration&Production, <br /> LLC <br /> Jackson County Area, Colorado <br /> Rk—Rock land <br /> Map Unit Composition <br /> Rock land. 100 percent <br /> Estimates are based on observations, descriptions, and transects of the <br /> mapunit. <br /> Description of Rock Land <br /> Setting <br /> Landform: Rockfall avalanches <br /> Down-slope shape: Convex, linear <br /> Across-slope shape: Convex, linear <br /> Parent material: Sandstone and/or rhyolite and/or schist and/or <br /> andesite and/or basalt and/or granite and gneiss <br /> Typical profile <br /> H1 -0 to 60 inches: unweathered bedrock <br /> Properties and qualities <br /> Slope: 25 to 80 percent <br /> Depth to restrictive feature: 0 inches to lithic bedrock <br /> Runoff class: Very high <br /> Capacity of the most limiting layer to transmit water(Ksat): Very low <br /> (0.00 to 0.00 in/hr) <br /> Available waterstorage in profile: Very low(about 0.0 inches) <br /> Interpretive groups <br /> Land capability classification(irrigated): None specified <br /> Land capability classification(noninigated): 8s <br /> Hydrologic Soil Group: D <br /> Data Source Information <br /> Soil Survey Area: Jackson County Area, Colorado <br /> Survey Area Data: Version 7, Sep 22, 2014 <br /> USDA Natural Resources Web Soil Survey 5/20/2016� <br /> Conservation Service National Cooperative Soil Survey Page 1 of 1 <br />