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<br />Section 2.05.4(2)(d) Page 6 April 2022 (PR-09) <br />forms of scarification. Rocks discovered during scarification on prime farmland will be removed. <br />Bench 1 is scarified to decrease compaction, increase aeration and water movement, and increase <br />plant rooting depths. Increased water movement may, to some degree, allow more downward <br />leaching of carbonates. Therefore, although the greatest benefits of scarifying are related to the <br />physical topsoil properties (density, porosity), a lesser geochemical benefit (increased rate of <br />carbonate leaching due to increased water movement) may result. <br /> <br />6. Bench 1 Monitoring Program <br /> <br />In order to provide a feedback system to check the reliability of the Bench 1, a sampling and <br />analysis program is utilized. This sampling program will ensure that the redistributed Bench 1 is <br />chemically and physically suitable for the intended post mine land use. Please see Table <br />2.05.4(2)(d)-1 for the Bench 1 sampling criteria. <br /> <br />Table 2.05.4(2)(d)-1 Bench 1 Sampling Criteria <br />Parameter Unit Thresholds <br />pH Standard Units >6.1 but < 8.4 <br />Electrical Conductivity (EC) mmho/com >8 <br />Boron ppm >5 <br />Sample Grid Arce 1 sample per 5 acres <br />Sample Thickness Feet 1 – 2 ft. increments <br /> <br />7. Unsuitable Bench 1 Mitigation Plan <br /> <br />In the event that any one sample result exceeds the limits listed in Table 2.05.4(2)(d)-1, the <br />Unsuitable Bench 1 Mitigation Plan listed below will be implemented. <br /> <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 /> <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 (Zones 3 & 8), and one hole <br />per 100 feet distance around the bad point in all directions for non-prime farmland. <br /> <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 irrigated pasture or 0.50 acres for dryland <br />pasture will be remediated. <br />