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• Seneca II-W <br />2001 Soit Sampling: Seneca Mine, Hayden Coloratlo <br />10 sites were sampled on approximately 150 acres of land. Field descriptions are <br />located in Appendix IV and lab data is located in Appendix II <br />Topsoil- All topsoil in all sample pits classifies as suitable topsoil. The results follow: <br />Depth- The average depth of topsoil is 14.3 inches (1 3 feet). Depth of topsoil <br />ranges 10 to 20 inches (.8 to 1.7 feet). The topsoil in all sample pits consisted <br />of two horizons. The upper horizon averages 5 inches of thickness and <br />ranges in depth from 4 to 6 inches in thickness. The tower topsoil horizon <br />averages 10 inches in thickness and ranges from 5 to 15 inches in thickness. <br />The difference in horizons is due to structure and dry and moist consistence <br />discussed below. All other characteristics between horizons are the same. <br />Textures- Textures range sandy loam, loam, clay loam and clay. Clay <br />content averages 37 percent and ranges 22 to 52 percent, sand content <br />averages 21 percent and ranges 18 to 41 percent. Silt content averages 42 <br />percent and ranges 27 to 36 percent. <br /> Rock Fragments- Rock fragments average 5 percent and range 0 to 20 <br />• percent. Rock Fragments are predominantly gravel size (2mm to 75mm) of <br /> sedimentary origin, primarily sandstone. <br /> Structure- The upper horizon in all sample pits are moderate medium and <br /> coarse platy and coarse and very coarse sub-angular blocky structure. The <br /> resultant structure and depth of the structure is consistent with a mechanically <br /> disked layer. Vegetation analysis discussed below did not indicate that any <br /> sites are problematic. The lower topsoil horizon is consistently moderate <br /> coarse and very coarse subangular blocky structure. This is consistent with <br /> mechanical redistribution of soil. Vegetation analysis discussed below did not <br /> indicate that such structure is presenting a problem to plant growth. <br /> Consistence- The dry consistence of the upper topsoil layer ranges from <br /> slightly hard to very hard, typical of disked soil and consistent with soil <br /> textures that have been mechanically manipulated. Vegetation analysis <br /> discussed below did not indicate that such consistence is presenting a <br /> problem to plant growth. <br /> Lab Data- Lab data is located in Appendix II Both the upper and lower topsoil <br /> horizons, differing only in their mechanical treatment, have the same chemical <br /> properties. pH ranges 6.8 to 7.8 and averages 7.4 which is slightly alkaline. <br /> Organic matter averages 4.9 percent and ranges 3.6 to 6.8. These results <br /> <br />• and all other lab data indicates topsoil in all sample pits as suitable (Appendix <br />III, Table-2). <br />Page 8 of 10 <br />1 t IG9/O t <br />