Photo: Drill pad

Pictured here are two drill rigs working on a pad in Garfield County, Colo., in 2007. Drilling the well is the first stage of well construction, followed by fracking and then in the third stage, the well becomes active. There are now more than 10,000 active wells tapping natural gas in the area but drilling has slowed on the west slope due to low market prices for natural gas.