From The Denver Post (Mark Jaffe) via Longmont Times-Call:
The setback bill failed on a 3 to 8 vote and the bill requiring “closed-loop” tank system in place of open pits went down 3 to 7. Rep. Su Ryden, D-Aurora, sponsor of the setback bill, told the House Local Government Committee the proposal was “in response to a serious situation” — the prospect of heavy oil and gas development near suburban areas. Another reason was a “lack action by the Colorado Oil and Gas Conservation Commission,” Ryden said…
The bill requiring the use of closed-loop systems to handle hydrofracturing fluids, a process in which large volumes of liquid are pumped into a well, was sponsored by Roger Wilson, D-Glenwood Springs. Wilson called the growing number of oil and gas pits in the state “an accident waiting to happen.” The bill would have required the use of the close-loop system whenever possible and not gone into effect for three years.