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|A closure plan was developed for the Intera Pond Facility, a former acid leaching collection pond at the BHP Robinson Mining Operations. To properly close the Intera Pond Facility, an engineering plan that was both technical and cost effective was developed. A primary objective of this closure project was to demonstrate to State regulators that following the proposed plan would minimize further degradation of water resources. Field data demonstrated natural attenuation of metal enriched solutes via carbonate reactions. Prospective fate and transport modeling indicated that it would not continue to degrade waters of the State.|