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6.4.5 EXHIBIT D — Extraction Plan <br /> Unit 3 soils commonly form within floodplains. As a result, differing states of soil formation <br /> may exist within the soil unit designation such as soils with little horizon development like <br /> nt so s and Iit eptisol�. Mol,llsgls with deep well-developed horizons may exist in the <br /> minority and the near fringe of planned extraction. Refer to graphic above, and bleow. <br /> Enceptlsol Inceptisol Molisol <br /> w <br /> ram.: <br /> Soil Morphology <br /> With over a century of agricultural manipulation of area agricultural fields, <br /> prior mixing or importation of soils for land leveling, or flood plain <br /> management in the creation of levees, may have dramatically altered the <br /> original native soil profiles and properties. The native A profile of the upland <br /> terrace found within the agricultural Fields at the TRP, is predominantly <br /> modified as a plow (Ap) layer of 6.0± to 8.0± inches. The historic practice of <br /> incorporating manure into the plow layer should have served to maintain the <br /> organic base and quality of the cropped soils and accelerated soil horizon <br /> formation and development where it was lagging. Since the cropped soils <br /> have been irrigated, care should be taken not to salvage soils greater than <br /> 12.0± inches in depth to avoid mixing of potential accumulated salts. <br /> We use Exhibit I/J to expand upon Soil and Vegetation considerations that are also <br /> considered relevant to Exhibit E - the Reclamation Plan and correlated as well in <br /> attending supplemental information provided from the U.S. Natural Resources and <br /> 231Page <br /> Correspondence to the Colorado Office of Mined Land Reclamation —Reply to Rob Zuber,EPS—Adequacy Letters of 24 June and 5 <br /> August 2022;in the matter of the Two Rivers Sand,Gravel and Reservoir Project—M2022-013. <br />