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0 • <br /> Other systems considered to minimize wind borne contaminants include: <br /> o Installation of soil cap - increases complexity of subsequent <br /> closure activities and increases quantities of potentially <br /> contaminated materials. <br /> o Installation of synthetic cap - increases complexity of <br /> subsequent closure activities. Liner cushioning sand layer and <br /> granular liner hold down layer increase quantities of <br /> potentially contaminated material to be managed in final closure <br /> activities. <br /> o Spray on dust suppressant foams and asphalt binders - erosion <br /> would reduce effectiveness. Interior faces of pond are subject <br /> to minor erosion. Without any inherent structural stability the <br /> surface applied coatings would erode with under lying layers. <br /> This would expose sediments and surface soils to the wind. <br /> Exposure potential would be reduced and not eliminated. This <br /> concern with surface-applied coatings on sloped earthen surfaces <br /> has apparently created problems at several sites in the State. <br /> Organic based foams and asphaltic spray coats also introduce <br /> organic contaminants to the soils which may affect subsequent <br /> treatment steps if such treatment is deemed necessary. <br /> Due to the concerns with each of the alternatives and due to the <br /> limited dust generation potential during the rainy season, the <br /> water dust suppression system will be implemented. <br /> 3. Direct dermal contact potential for MCTC employees will be minimized <br /> through installation of warning signs at access points to the pond, <br /> installation of a warning banner around the top perimeter of the pond, <br /> and through maintenance of a worker information program. <br />