Q In the biological treatment of wastewater, microorganisms break down the organic matter, such as food, oil, and human waste, in the wastewater and forms CO2 and microbial biomass. When firefighters combat a fire near a wastewater treatment plant where agricultural pesticides are involved, explain why the wastewater treatment operators are notified. Also, explain why there are fewer inorganic pesticides that are encountered today. Your response must be at least 75 words in length.

Q The 8-hour time-weighted average limit set by the Occupational Safety and Health Administration (OSHA) for carbon monoxide (CO) is 50 ppm. The OSHA regulation at 29 C.F.R. §1910.1000(d) requires employers to determine the cumulative exposure of workers to certain gases over an 8-hour work shift using the formula