When a single measurement is wildly off the previously assumed average (6-12% vs. the 1% in an EPA report), the minimum treatment is to call for better and more monitoring. Apparently, these scientists themselves have newer, still to be analysed measurements (my emphasis):

CIRES, NOAA observe significant methane leaks in a Utah natural gas field

Karion, Sweeney and their co-authors continue to analyze methane and other emissions data gathered in Uintah Basin, in 2012 and 2013, and from recent scientific flights through other oil and gas production regions.