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2001 Soil Sampling: Seneca Mine, Hayden Colorado <br />• Seneca II-W <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 lower 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 p-ant 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 />and all other lab data indicates topsoil in all sample pits as suitable (Appendix <br />III, Table-2). <br />Page 8 of 10 <br />11/09/01 <br />