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Mule Creek Gravel~Environmental Assessment • Page 17 <br />' 4. Seedling trees and shrubs would be planted on the flat azeas and stockpiled <br /> mulch from the chipping of tree limbs and shrubs will be distributed to retain <br />' moisture and protect the soil. One tree island would be planted on each acre <br /> of disturbed land, and each tree island would include no less than 4 trees and 4 <br /> shrubs. <br /> <br /> 5. Performance standards will be developed to establish reclamation goals and to <br /> provide guidelines for evaluating the success of the site reclamation activities. <br />' The reclamation plan will comply with Rule 6 of the Mined Land Reclamation <br /> Regulations, and will be performed on all affected lands as follows: <br />A. Grading: <br />i) Backfilling may be performed in some areas to reduce slopes to no <br />' more than 2:1. Wood debris (logs, roots, etc) and soil will be <br />pushed from the top of a slope downward. This material will key <br />into the slope to help provide stabilization. Adequate compaction <br />' will be performed to ensure additional stability of final regraded <br />surface. <br />' ii) In azeas where it is not practical to obtain a slope no steeper than <br /> 2:1, erosion control bench terraces will be installed across the <br /> slope. The use of small benches will be preferred to large ones, as <br />' the former tend to slide over time, thus resulting in a more natural <br /> slope profile. <br />' iii) All backfilling and grading will be completed within 6 to 8 months <br /> after completion of gravel mining in a designated phased area. <br /> iv) No refuse, acid forming or toxic producing materials will be <br />' mined. <br />' v) No auger or drill holes will remain. <br /> vi) Final slopes will be no steeper than 2:1 in gravel mined area. 3:1 <br />' slopes will be preferable. <br /> vii) Agricultural crop production is not a part of final reclamation. <br />' B. Water: <br />' i) This operation will not appreciably disturb water quality or the <br />prevailing hydrologic balance of affected land and the surrounding <br /> azea. Run off from the slopes to be mined will be diverted into <br /> detention ponds along the West edge of the existing railroad bed. <br />A silt fence will be installed on the West boundary of the area to be <br /> mined. <br />1 <br />' Hydrosphere Resource Consulumts, 1002 Walnut Suite 200, Boulder, CO 80302 <br />