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LJ <br />zz <br />' <br /> None of the samples contained significant amounts of sodium. <br /> The quarry and crusher fines have a satisfactory physical composition and <br /> contain minor fertilizer elements in satisfactory quantities. To become <br /> a good "soil" for plants, however, they will need organic matter, phos- <br /> phorus and nitrogen. This subject will be pursued further under the <br />' heading, "Rehabilitation." <br />' Road construction moved the soil from about 1.4 acres, mixed it with rock <br />and surficial geologic materials, and side cast it to cover soil on another <br /> 1.4 acres. This action had no affect on soil volume but it does damage soil <br /> properties and productivity on-site, Table 1. The damages will be permanent <br />' unless the orads are ripped and the side-case soil replaced upon termination <br /> of the operation. <br /> Storm run-off from both the quarry area and the roads have a potential to <br />' casue soil erosion, both on-site and off-site, Table 1. Soil erosion from <br /> both sources is avoidable, however. No serious soil erosion has occurred <br />' yet. Possible soil erosion is monitored annually, <br /> Future Impacts <br />' The impacts of road construction should be over, The quarry now covers <br /> 70 to 80 percent of the planned final area. An additional 10 to 18 acres <br /> of soil may be destroyed. The potential for soil erosion remains. <br />' Recommendations <br /> ]. Maintain the drainage systems for the quarry area and 'the roads <br />' in good operating condition at all times, <br /> 2. Correct promptly any drainage problems that develop or that <br />' start new soil erosion in the future, <br /> 3. Carry out the rehabilitation plan as recommended. <br />1 Vegetation <br /> Figure 2 shows the vegetation types as mapped and described in the ]972 <br /> study and report. <br /> Nature of Impacts <br />' The vegetation has already been destroyed on about 70 to 80 percent <br /> of the planned ultimate quarry area of about 50 acres and on about 3.7 <br />' acres of road disturbances. A good part of an interesting ecological <br />biome was destroyed, but the biome is not unique. It is found elsewhere <br /> along the Front Range. <br />' The composition of the vegetation can be considered to be changed permanently, <br />Table 1. That will not be ecologically important, however, as the natural <br />composition had been altered greatly by past over-grazing. Invading cheat <br />' grass dominated much of the lower part of the area. <br /> <br />