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-13- <br /> TABLE 28: Criteria to Establish Overburden Suitability.* (Continued ) <br /> Surface <br /> (potential root zone) Aquifer Restoration <br /> Parameter Suitable Unsuitable Suitable Unsuitable <br /> Lead 10 ppm > 10 ppm Depends on <br /> pre-mining water <br /> quality and <br /> overburden <br /> quality <br /> Arsenic < 2.0 ppm > 2.0 ppm Depends on <br /> pre-mining water <br /> quality and <br /> overburden <br /> quality <br /> 1/ Overburden material placed directly under respread topsoil should be of <br /> similar suitability as the topsoil . The upward migration of soluble <br /> salts must be considered. <br /> 2/ An excessive consumption of molybdenum through ingestion of vegetation <br /> may be toxic to animals. The concern is directly related to the C4:Mo <br /> ratio in the plant tissue. <br /> 3/ Record as Acid pot. in meq H+/100 g, Neutralization pot. , acid-base <br /> potential in + tons CaCO3 equivalent/1000 tons. <br /> X Excerpt from Wyoming Department of Environmental Quality Land Quality <br /> Division's Guideline No. 1 - Topsoil and Overburden. <br />