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Observational Approach. Conditions that are observed that are inconsistent with the models and <br />conclusions described in Section 2 of this document may result in additional evaluation of <br />geotechnical conditions. <br />7.4 Vegetative Soil <br />Due to the relatively steep site conditions at the northern and western -most haul road locations and at <br />the buttress site, very little true topsoil was present prior to development. As such, only the <br />uppermost soil horizon(s) of the colluvial soils were salvaged from these areas and stockpiled as <br />vegetative soil for future reclamation needs. Soil salvage and borings conducted to date at the southern <br />extent of the RPEE indicate that an average of 24 inches of topsoil is present across the RPEE waste <br />rock pile footprint (although the majority of in-place topsoil is located near the thalweg of the gulch). <br />Where present, at least 24 inches of topsoil will be salvaged (or at least the uppermost soil horizons where <br />less vegetative material is available) from the waste rock pile foundation area and will be stockpiled for <br />future reclamation needs, or will be immediately placed on the face of the waste rock pile after being <br />prepared to design grade as part of contemporaneous reclamation. <br />Vegetative soil stripped from the RPEE area may be temporarily stored in live soil stockpiles upslope <br />of the working pad, but will be primarily stored for future use in stockpiles located in a more gently <br />sloping area west of the RPEE as shown on drawing C-05 in Appendix D (the RPEE Soil Storage <br />Area), placed on an area of the waste rock pile that is ready for reclamation, or in a stockpile in the <br />existing North Soil Storage Area or other approved soil storage area on MCC property, where the soil <br />will be protected from erosion, compaction and contamination. Vegetative soil will be removed after <br />clearing and grubbing of the waste rock pile area and will be removed at a time when erosion can be <br />minimized. Stockpiled soils will be seeded with MCC's approved permanent seed mix to aid in <br />preventing erosion. <br />36 <br />P:\Mpls\06 CO\26\06261003 MCC Refuse Pile Site Review & Permit\WorkFiles\Permit Application\2014 Revision\Exhibit 82 2014-05- <br />29.docx <br />