The report suggests the employer might need a more formal training program and a reevaluation of the site's hazards.
It took until 1 a.m. for 16 firefighters and two command officers to extinguish the blaze.
Campbell County Health spokeswoman Karen Clarke says the injured workers were contractors for Devon Energy.
The explosion injured Kimberly Brizuela and Scott Tiernan, who later died at a Greely hospital.
Two boys, ages 12 and 14, had attempted to fashion what the Sheriff described as some sort of makeshift cannon.
A 16-year-old Laramie County boy has been arrested in connection with an explosion in a downtown Cheyenne alley Monday morning.
Cheyenne police are investigating after a small, homemade explosive device exploded in a downtown alley this (Monday) morning.