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A worker at Metro wastewater utility cuts brick for the new 18 million dollar primary treatment sludge tanks currently being built. Wastewater utilities around Colorado are preparing to spend hundreds of millions of dollars to comply with new rules to limit ammonia discharges into rivers and streams. Metro, the largest wastewater utility in Colorado, is spending more than $200 million. (JAVIER MANZANO/ROCKY MOUNTAIN NEWS).

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