Because of by City and State agencies, Residents of Colleyville TX had to pay
for a private company test to the "steam" reportedly released in Frac'ing
operations around their neighborhood.  Instead of steam as the company claimed:

"The community-funded test results...detected twenty-six chemicals, also showed
carbon disulfide, a neurotoxin at twice the state level for short-term
exposure. Benzene, a known carcinogen, and Naphthalene, a suspected carcinogen,
were both over state long-term exposure levels by more than 9 times and more
than 7 times, respectively. Carbonyl sulfide, dimethyl disulfide and Pyridine
were all detected above safe limits for long-term exposure."

http://www.earthworksaction.org/media/detail/independent_test_results...