Help me study for my Science class. I’m stuck and don’t understand.

Consider the scenario below:

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 ventilating the space for 15 minutes, the oxygen reading reached 18% and remained at that level.

Address the following items:

Your submission must be a minimum of two pages, not including title and reference pages, and follow APA guidelines. All sources used must be referenced; paraphrased and quoted material must have accompanying citations.



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