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DEEP OVERBURDEN (Mining Area 1) <br /> CLASS 1 Highly suitable root growth material. The upper 15 feet of overburden <br /> consisting predominantly of soft, weathered, brown sandstone and sandy shale. <br /> This material will be utilized, whenever feasible, in the upper four feet <br /> (includes replaced topsoil thickness) of the reclaimed soil profile. <br /> CLASS 2 Moderately suitable root growth material. All overburden material located <br /> strati graphically between the highly suitable and unsuitable overburden. This <br /> material consists predominantly of hard, brownish gray sandstone with a moderate <br /> salinity limitation. This material will also be utilized in the upper four feet <br /> (includes replaced topsoil thickness) of the reclaimed soil profile. <br /> CLASS 3 Poorly suitable root growth material. All interburden material. The <br /> interburden consists predominantly of hard, light to dark gray sandstone and <br /> dark gray shale with lower percentages of gray sandy shale and black coal. <br /> Limitations include hardness, carbonaceous shale, and acidity. This material <br /> will not be placed, whenever feasible, in the upper four feet (includes replaced <br /> topsoil thickness) of the reclaimed soil profile. <br /> CLASS 4 Unsuitable root growth material. The 15-foot overburden section located <br /> directly above the Upper Dakota Coal seam consisting predominantly of hard, dark <br /> gray shale with lesser amounts of gray sandstone and sandy shale. All parting <br /> material from the Lower Dakota seam is also included in Class 4. Limitations <br /> include acidity, hardness, coal, and carbonaceous shale. This material will not <br /> be replaced in either the upper four feet (includes replaced topsoil thickness) <br /> of the reclaimed soil profile nor within ten feet of the pit base. <br /> SHALLOW OVERBURDEN (Mining Areas 2 and 3) <br /> UNIT 1 Highly suitable root growth material. The upper four to five feet of overburden <br /> consisting of brown to light brownish-gray sandstone and light gray to gray <br /> shale. This material will be utilized, whenever feasible, in the upper four <br /> feet (includes replaced topsoil thickness) of the reclaimed soil profile. <br /> UNIT 2 Unsuitable root growth material. The oxidized and weathered Upper Dakota coal <br /> seam and encapsulating very dark gray to black carbonaceous 'shale. The average <br /> thickness is about three to five feet. Limitations include acidity, salinity, <br /> coal, and carbonaceous shale. This material will not be replaced in the upper <br /> four feet (includes replaced topsoil thickness) of the reclaimed soil profile. <br /> UNIT 3 Suitable root growth material. The upper five to eight feet of interburden <br /> consisting of brown to light brownish-gray sandstone. This material will be <br /> 21-2 Revised 04/11/88 <br />