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• <br />Section 180.18(b) Continued. <br />since the conditions for reestablishing reseeded vegetation at the Kerr <br />Tipple are considered favorable due to the abundance of water, Kerr Coal <br />feels justified in proposing two inches of topsoil at this site. <br />Reclamation Soil Testing Plan <br />In order to assure that the reapplied topsoil will support the proposed <br />postmining land uses, spoil/soil sampling programs will be implemented. <br />Spoil sampling will involve completion of auger holes or sample pits in <br />regraded spoil materials to a depth sufficient to meet the regulatory <br />requirement for a minimum of 4 feet of suitable cover material. Suitable <br />cover will include both the upper spoil materials and topsoil, so spoil <br />sampling depth will be defined as 4 feet minus the proposed topsoil <br />replacement depth with spoil samples composited over the entire sampling <br />• thickness. <br />Spacing of spoil samples will be determined in cooperation with the CMLRD <br />for specific pit areas and will be reflective of the level of concern <br />relative to potential spoil toxicity based upon available overburden <br />geochemical data. Kerr has agreed to initial sampling on 300 foot centers <br />for Pit 1 and 500 foot centers for the 720 Pit with an offset of <br />approximately 60 degrees between adjacent rows of samples. If sampling <br />results identify a potential toxicity concern, additional sampling will be <br />completed in the area of concern to verify the original sampling results <br />and define the limits of any potential problem area. <br />Spoil samples will be composited over the sampling interval, bagged, <br />labeled and shipped to a qualified laboratory for analysis. Spoil samples <br />will be analyzed for pH, electrical conductivity (EC), saturation <br />percentage (SP), cation exchange capacity (CEC), sodium adsorption ratio <br />(SAR) and exchangeable sodium percentage (ESP). Spoil suitability will be <br />. evaluated utilizing the criteria set forth in Nyoming Department of <br />Environmental Quality (WDEQ), Guideline No. 1, Topsoil and Overburden. <br />Suitability limits for ESP are not currently provided in any of the <br />published regulatory guidelines and there is no general agreement in the <br />12R Revised - August, 1990 <br />