Oil and gas have contaminated groundwater in 17 percent of the 2,078 spills and slow releases that companies reported to state regulators over the past five years, state data show.
The damage is worse in Weld County, where 40 percent of spills reach groundwater, the data show.
Most of the spills are happening less than 30 feet underground — not in the deep well bores that carry drilling fluids into rock.
Read the rest of the article here.State regulators say oil and gas crews typically are working on storage tanks or pipelines when they discover that petroleum material, which can contain cancer-causing benzene, has seeped into soil and reached groundwater. Companies respond with vacuum trucks or by excavating tainted soil.
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