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• 4.3.4 TOPSOIL STOCKPILES <br />Topsoil stockpiles were considered either active or inactive. A <br />topsoil stockpile was considered active when the addition or removal of <br />soil materials was planned or undertaken during the operating year (May 1st <br />through April 30th). A stockpile was considered inactive when the addition <br />or removal of soil materials was not planned or undertaken during an <br />operating year. Various erosion control methods were used, either singly <br />or in combination, to protect the topsoil stockpiles from excessive erosion <br />and may have included the following: mulching, establishment of vegetation, <br />contouring, berming, imprinting or silt fencing. Active topsoil stockpiles <br />did not utilize the establishment of vegetation as a protection against <br />excessive erosion, since this method would not be effective. Either the <br />permanent, temporary or cover crop seed mixtures were used to establish <br />vegetation on inactive topsoil stockpiles. Revegetation operations on <br />inactive stockpiles was conducted in the fall when the stockpiles were no <br />longer being disturbed by the addition or removal of reconstruction <br />materials and when the soil moisture was optimum. <br />Two small topsoil stockpiles remain on the Moffat Area. One of the <br />stockpiles is located along the North Moffat Collection Ditch and will be <br />• used to retopsoil the ditch area once the sedimentation control structure <br />is no longer needed. The second small stockpile is located near the South <br />Moffat Collection Ditch and will be used to retopsoil the southern end of <br />the ditch once it is no longer needed for sedimentation control. Both of <br />these topsoil stockpiles are shown on Exhibit 9.3-2, Sheet 1. <br />4.3.5 TOPSOIL REDISTRIBUTION A!ID SEEDBED PREPARATION <br />After final grading and before topsoil is replaced, the spoil is <br />roughened along the contour in order to form an interlocking interface <br />between the topsoil and overburden so as to minimize the potential for <br />topsoil slippage. Topsoil is then redistributed over the final graded <br />spoils by scrapers. Topsoil materials is redistributed in a manner that <br />minimizes the potential for excessive compaction. Should replaced topsoils <br />become excessively compacted, this condition will be alleviated using <br />appropriate methods (i.e., discing, ripping, etc.). Once the topsoil <br />materials are replaced, soil quality and quantity control testing will be <br />undertaken as described under 4.3.5.1. <br />• <br />Renewal-3 4.3-9 June 13, 1997 <br />