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~~ . , . - <br />~ amounts of topsoil and subsoil which will have to be stockpiled <br />when the 320 ft by 100 ft pit is initially opened are 300 and <br />1050 cubic yards, respectively. Thus, the anticipated size of <br />the initial topsoil stockpile will be about 950 yards (650+300) <br />and the size of the initial subsoil stockpile will be 3340 yards <br />(2290+1050). <br />When the operation reaches the Manzano Loam (Tm) area, <br />about one-half of the 1983 and 1984A pit area will have been <br />mined. In order to utilize the thicker topsoil and subsoil <br />thicknesses in the Tm soil, the Tm soils will be stockpiled <br />(segregated according to topsoil and subsoil) as required so <br />that a uniform thickness of Tm combined with LTE soils can be <br />spread over the reamainder of the 1983-1984A pit. The soil <br />analyses indicate that the Tm soils can be mixed with the LTE <br />soils without deleterious effects. The amount of Tm soil to be <br />stockpiled is calculated as shown by the following example for <br />Tm topsoil: <br />Determine amount of topsoil, both LTE and Tm, available in <br />the remaining half of the 1983 and 1984A pit: <br />0.5 x (1983 LTE + 1984A LTE) + Tm = <br />0.5 x (4610 + 2680 ) + 3870 = 7515 cubic yards <br />Determine the acreage to be covered to a uniform depth by <br />this amount of material: <br />0.5 x (1983 + 1984A) + 1984A Tm = <br />0.5 x (8.57 + 4.98) + 1.92 = 8.70 acres <br />Calculate uniform thickness: <br />7515 cu. ds x 27 cu.ft./cu. d. x 12"/' = 6.4" <br />sq. t ac. x ac. <br />The amount of Tm soil to stockpile for later spreading with <br />LTE soil on the rest of the pit should be the difference <br />between the original 15 inch depth of topsoil on the Tm area <br />and the 6.4 inch depth that will be the final uniform depth <br />over the Tm and LTE area. This volume is calculated as: <br />(15"-6.4") x 43560 x 1.92A = 2200 cu. yd. <br />-~2'"T' x ~~t. cu.y . <br />