Abound made national headlines last year when the solar firm collapsed after receiving a $400 million taxpayer loan guarantee. But that failure could potentially stick taxpayers with an estimated $2.2 million more in cleanup costs ... ... Colorado Department of Public Health and Environment had informally ordered Abound Solar to clean up hazardous waste at four Front Range locations, where concerns were raised about contamination. The CDPHE found 2,500 pallets of “unsellable” solar panels and over 6,000 gallons of hazardous liquids. The panels and liquids contain cadmium, considered a toxic substance by federal health agencies