A 6-year-old Colorado Springs girl plunged more than 100 feet to her death at Glenwood Caverns Adventure Park over Labor Day weekend because operators of the vertical drop thrill ride she was on did not properly check her seatbelts, according to a state investigation into the fatality. Investigators found the girl, Wongel Estifanos, was actually sitting on the two seatbelts instead of wearing them across her lap, and the ride’s two newly hired operators never noticed even though they checked that everyone’s belt was fastened. An alarm system warned of a problem, but the two workers weren’t trained well enough to know what to do about it, so one of them reset the system and sent the ride on its way, investigators with the Colorado Department of Labor and Employment’s division of oil and public safety found. Inspectors ordered the park to remain closed shortly after the Sept.