Abstract: At approximately 2:00 p.m. on April 25, 2001, Employees #1, #2, #3 were exposed to hydrogen sulfide gas when they entered a confined space situation. All three employees worked at a municipal waste transfer station doing business as BFI Waste Services, which is owned by Allied Waste Industries, Incorporated. At first, Employee #1, a facility supervisor, was seriously injured when he entered a flooded underground vault-drain to check out why it wasn't draining. While in the vault, Employee #1 was overcome with hydrogen sulfide gas, when he moved a loose fitting sewer pipe that crossed the underground confined space. The sewer pipe measured 8 inches. Employees #2 and #3, who worked under the facility supervisor's direction, were also seriously exposed to hydrogen sulfide when they attempted to rescue their supervisor. All three employees went to a local hospital for treatment.