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Unformatted text preview: necessary, and hauled away by truck for beneficial reuse or permanent disposal. Most of our ash holding ponds are constructed as below-grade basins, similar to an in-ground swimming pool. A notable exception is the Sherburne County Generating Station (Sherco) where some ash ponds are substantially above grade or ground-level. Ash ponds that are above grade are subject to state dam-safety inspection programs. In 2009, the U.S. Environmental Protection Agency (EPA) asked utilities across the country to submit detailed information on company-owned coal ash surface impoundments. Xcel Energy provided EPA with information on its 21 surface impoundments used to manage coal ash, as well as other surface impoundments, such as storm-water containment ponds. Xcel Energys response can be found on the EPA website ....
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- Spring '11
- Corporate Finance