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2001 Soil Sampling: Seneca Mine, Hayden Colorado <br />C~ <br />typical of grasses and forbs. The tower topsoil has good root penetration with <br />common fine, common to many very fine and few medium roots. Root <br />penetration should continue and even ameliorate soil structure further. Root <br />penetration into the upper part of the subsoil is only now beginning. Few fine <br />and very fine roots are penetrating the horizon. Roots are not matting along <br />the topsoil/subsoil boundary indicating that root penetration will continue over <br />time. <br />Conclusions <br />Overall topsoil and subsoil are suitable and are supporting a vigorous dryland <br />pasture of grasses and forbs. Over time, the soil will continue to support vegetation <br />that meets management objectives. Fertilizer application for the area is not indicated •~ <br />especially since there is already high organic matter levels. Contour furrows on 20 <br />foot centers are indicated for slopes greater than 15 percent. This is to prevent <br />gullying. Future seeding should be proceeded by ripping on 2 to 4 foot centers to a ~ t <br />depth of 18 inches. In addition the disking tool should be weighted to increase the <br />penetration depth of the disks to 6 to 8 inches.;Both processes will reduce soil <br />compaction increase water infiltration and soil moisture holding capacity which in <br />turn will increase live perennial vegetative cover. <br />Clay is hot considered a suitable topsoil replacement.in the original permit. However <br />. baseline studies indicated clay soils. Revegetation on clay soil has both good to <br />excellent vigor and foliar quality and color. It is recommended that he permit be <br />amended to allow for clay soils to be suitable for topsoil replacement provided the <br />dlay soil material comes from the topsoil orsubsoil stockpile. <br /> <br />Page 10 of 10 <br />11/09/01 <br />