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T <br /> <br />' 544-2 Land F:e construction <br />' Specificaticns guide <br />Site preparation. Areas shall be cleared of trees, logs, brush, rubbish <br />' and other undesirable materials. Areas to be preserved, including those <br />containing vegetation, stream corridors, natural springs or other important <br />features, stall be properly identified. <br />' Removal of soil material for use as topsoil. All upper soil horizons to <br />be used in x'econstructinq the soil shall be removed from the immediate area <br />before drilling for blasting, mining or any surface disturbance other than <br />' removal of uroody plants. <br />All the F~ horizon shall be removed for use as surface soil on disturbed <br />' areas. If t:he A horizon is less than 6 inches thick, enough material, other <br />than bedroc}:, immediately below the A horizon can be removed and used to <br />obtain this thickness. If the total thickness of the available material <br />' is less than 6 inches, all unconsolidated material can be used. <br />If increzised soil productivity is required for a post-mining use, the <br />B horizon or part of the C horizon or other underlying layers suitable for <br />' root deve o}~ment shall be removed and segregated for use as subsoil. The <br />minimum d pth of the soil and the soil material to be reconstructed shall <br />be 48 inche:> or be equal to the depth of the subsurface horizon in the natural <br />' soil, whichever is less. <br />Removal of overburden material for use as topsoil. Selected overburden <br />' material can be substituted for or be added to the material in the A and <br />B horizons if it is demonstrated by field observations and chemical and <br />physical la'~oratory analyses that the overburden material or the overburden <br />and topsoil mixture is better suited to use in restoring the capability <br />' and productivity Of the land than the material originally in the A and 8 <br />horizons. 5nalyses can include determination of pH value; sulfide content.; <br />percentage of organic material, nitrogen, phosphorus and potassium; texture; <br />and available water capacity. Field-site trials or greenhouse tests may <br />be needed to ascertain the feasibility of using overburden material. <br />' If it is determined that the overburden material is suitable, it must <br />be removed, segregated and replaced according to the requirements specified <br />in this standard. <br />' Storage of topsoil material. If it is impractical to spread the topsoil <br />immediately after the land is re-graded, it must be stockpiled. Stockpiles <br />shall be selectively located and ~~rotected from wind and water erosion, <br />' unnecessary compaction and contamination by undesirable materials. An effec- <br />tive vegetative cover or other' suitably practices can provide adequate protection. <br />1 <br />April 1979 <br /> <br />