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' 1999 Soil Sampling: Seneca Mine, Hayden Colorado <br />' the site. Achieving adequate vegetative cover could be problematic over time. Site <br />• conditions can only be ameliorated if more subsoil is available. Ripping on the <br />contour to reduce compaction can also be problematic if ripping penetrates past 1.5 <br />feet. Infiltration will bypass the soil medium and drain through the porous cobble <br />stone spoil. It is recommended that further sampling occur at this site to determine <br />' whether the depth to cobble stone spoil material is typical or an anomaly. SEN-2-99 <br />is suitable and, lacking an overly enthusiastic wildlife foraging campaign, should <br />yield a productive shrubland community. Fertilizer application for the area is not <br />' indicated especially since there is already high organic matter levels. <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 />1 Topsoil- All topsoil in all sample pits classifies as suitable topsoil (Appendix III, <br />Table-2). 2W-5-99 borders on marginally suitable as texture straddles the clay loam- <br />' clay boundary. All other indications of 2W-5-99 result in a classification of suitable <br />topsoil. The results follow: <br />' Depth- The average depth of topsoil is 20 inches (1.7 feet). Depth of topsoil <br />ranges 10 to 25 inches (.8 to 2.1 feet). The topsoil in all sample pits consisted <br />of two horizons. The upper horizon averages 8 inches of thickness and <br />ranges in depth from 6 to 10 inches in thickness. The lower topsoil horizon <br />averages 12 inches in thickness and ranges from 6 to 16 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 loam to clay loam. One sample bordered on clay <br />(2W-5-99) and one sample was a sandy clay loam (2W-9-99). Clay content <br />averages 26 percent and ranges 20 to 40 percent, sand content averages 34 <br />' percent and ranges 20 to 46 percent. Silt content averages 40 percent and <br />ranges 27 to 47 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 except two are moderate <br />medium and coarse platy structure. The resultant structure and depth of the <br />' structure is consistent with a mechanically disked layer. Two sample pits 2W- <br />1-99 and 2W-5-99that are located on gentle slopes of 8 and 12 percent and <br />have strong coarse and very coarse platy structure indicative of extra traffic <br />' and a resultant increase in compaction. 2W-5-99 borders on clay and the <br />resultant stronger structure may be due to the higher density of the clay. <br />Vegetation analysis discussed below did not indicate that either of these two <br />Page 8 of 11 <br />09/23/99 <br />