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14.0 Topsoil Suitability Criteria and Testing Plan for Reclaimed Soils <br />Prior to distribution of topsoil, all graded mined areas (on which topsoil is to be applied) will be <br />sampled to confirm spoil suitability (see Regraded Spoil Monitoring Plan in subsection 4.0 of <br />this section for more details). The density and physical characteristics of the replaced topsoil and <br />upper spoil will be observed. <br />The suitability criteria is required to ensure that no poor topsoil or Bench 1 is placed near the <br />surface of any reclaimed area and that prime farmlands are restored to strict standards for high <br />productivity. <br />Soil suitability criteria for all non -prime farmland areas west of 2700 Road are addressed in <br />Table 2.05.4(2)(d)-1. Soil suitability for prime farmlands is addressed is Section 2.06.6. <br />Depth measurements shall be taken at the same locations as the original sample sites. The topsoil <br />salvage and replacement depth information will be kept on file at the mine office and will be <br />submitted with the Annual Topsoil Balance/Spoil Quality Report to DRMS. Topsoil recovery <br />depths will be adjusted if warranted by the site conditions. Sample frequency is as shown in the <br />table for each material type. <br />15.0 Topsoil Remediation Plans <br />In the event that any one soil sample result exceeds the limits, New Horizon will implement the <br />topsoil remediation plan below. <br />If one or more parameters fall within the unsuitable range at a given grid point, a three-part <br />mitigation plan will be implemented. <br />1. The area around a suspect hole will be sampled on a closer spacing interval in order to <br />better define the lateral extent and variability of the unsuitable material. This sampling <br />will be called the 2nd Phase sampling and the interval is one hole per 50 feet distance <br />around the bad point in all directions for prime farmland, and one hole per 100 feet <br />distance around the bad point in all directions for reclaimed irrigated pastureland and <br />dryland pasture. <br />2. If 2nd phase sampling shows an exceedance, follow-up sampling will take place to <br />delineate the area of exceedance. Delineated areas of exceedance that are larger than 0.1 <br />acres for prime farmland, 0.25 acres for reclaimed irrigated pastureland or 0.50 acres for <br />dryland pasture will be remediated. <br />July 2018 (TR -84) 2.05.4(2)(d)-24 <br />