Repairing leaking valves

REPAIRING LEAKING VALVES THAT CONTROL THE FLOW OF WASTEWATER

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Workers need to enter a below-ground, concrete-lined vault to repair a
leaking valve that controls the flow of wastewater from several
buildings at your plant. The opening for the pit is outdoors and secured
with a 36-inch diameter manhole cover. The pit is 12 feet deep, and the
walls are 6 feet x 6 feet wide. The valve is at the bottom of the vault.
You opened the cover, tested the atmosphere, and found oxygen levels to
be at 16%. No toxic substances were detected. After ventilation the
space for 15 minutes, the oxygen reading reached 18% and remained at
that level.

REPAIRING LEAKING VALVES THAT CONTROL THE FLOW OF WASTEWATER

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Address the following items:
– Using the flow chart in Appendix A of 29 CFR 1910.146, determine the
classification of the space. Explain how you reached the decision.
– Based on your determination, develop an OSHA compliant standard
operating procedure (SOP) for workers to follow when entering the space
to repair the valve. Include the citation(s) from 29 CFR 1910.146 for
each step of the procedure.