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Twelve (12)to eighteen(18) inches of soil were salvaged from the sediment pond and <br /> riprap stockpile area, and 24 inches of soil were salvaged from the office area. <br /> Information in Tables 4.4-1 through 4.4-6 of the PAP documents the suitability of affected <br /> soil types by horizon. Upper horizons of the affected soil types are generally good growth <br /> media, with the exception of the Havre Loam, which exhibits SAR values in excess of 40 <br /> within each sampled horizon below a depth of 1.5 inches. <br /> Because no topsoil was salvaged initially, portions of the reclaimed mine bench <br /> access/haul road may not be topsoiled upon final reclamation, and the mixed soils and <br /> overburden material in the bench and outslopes would be used as plant growth medium <br /> for final reclamation. Section 4.4.5.4 of the PAP summarizes evaluation of the surficial <br /> and subsurface bench materials required by the Division through stipulations attached to <br /> the 1982 and 1985 permit approvals. Analyses submitted in response to the stipulations <br /> demonstrated that the material would be suitable for plant growth, and that no special <br /> handling would be required. <br /> Upon final reclamation,topsoil will be re-spread to a minimum depth of 24 inches in the <br /> office area, and 4 to 8 inches on other post-law disturbance areas and approximately I <br /> acre of the mine bench. Sediment that has been removed from the sedimentation pond <br /> during particular sediment cleanout events in the past has been demonstrated to be <br /> suitable plant growth material, and has been allowed to be placed in the topsoil stockpile. <br /> Pond cleanout material will be approved for use as topdressing on pre-law disturbance <br /> areas only upon submittal of chemical and physical analyses demonstrating its suitability. <br /> During periods of active mining, coal fines are a significant component of sediment <br /> delivered to the pond, and the sediment cleanout material is not a suitable plant growth <br /> medium at such times. The following stipulation is necessary. <br /> STIPULATION NO. 27 <br /> SEDIMENT REMOVED FROM THE SEDIMENT POND MAY BE USED AS A <br /> TOPDRESSING OR TOPSOIL SUPPLEMENT PURSUANT TO RULE 4.06.2(4)(a), <br /> UPON SUBMITTAL OF CHEMICAL AND PHYSICAL ANALYSES <br /> DEMONSTRATING THAT THE MATERIAL IS EQUAL TO OR MORE SUITABLE <br /> FOR SUSTAINING VEGETATION THAN AVAILABLE TOPSOIL OR OTHER <br /> PLANT GROWTH MEDIA. SUCH DEMONSTRATION SHALL BE BASED ON A <br /> REPRESENTATIVE COMPOSITE SAMPLE OF THE MATERIAL OBTAINED <br /> FROM EACH POND CLEANOUT EPISODE. REQUIRED PARAMETERS WILL <br /> INCLUDE THOSE LISTED IN 4.06.2(4)(a), WITH THE EXCEPTION OF <br /> THICKNESS, DEPTH, COARSE FRAGMENTS,AND AREAL EXTENT. <br /> ANALYSES FOR SELENIUM, BORON,NITROGEN AND ORGANIC MATTER <br /> WILL BE INCLUDED IN ADDITION TO THOSE LISTED. POND CLEANOUT <br /> MATERIAL WILL NOT BE PLACED IN THE TOPSOIL STOCKPILE OR USED AS <br /> FINAL RECLAMATION TOPDRESSING PRIOR TO OBTAINING WRITTEN <br /> APPROVAL FROM THE DIVISION. <br /> xxii <br />