CWEA Environmental Compliance (Questions & Answers) Verified 100% Correct!!

An industry operating an 8-hour shift, 5 days per week, generates 100,000 gallons of wastewater per shift. Their pretreatment system has a capacity of 150 gallons per minute. How long must the pretreatment facility operate to process the wastewater generated each day? - Answer-11.1 hours An industry has five sewer connections with the following discharge rates: 1) 300 gpd, 2) 75 gpd, 3) 725 gpd, 4) 1,200 gpd, 5) 200 gpd A flow-weighted composite sample of 5 liters is desired. How many milliliters of sample from each connection should be composited? - Answer-600, 150, 1450, 2400, 400 Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water Act, are pollutants that: - Answer-create a fire or explosion hazard in the sewer or POTW. "MSDS" is an acronym for what? - Answer-Material Safety Data Sheet Safety hazards associated with hydrogen sulfide in sewer systems include: - Answer-toxic gasses. A significant industrial user can be defined as: - Answer-a federal categorical industrial user. Lead acetate paper is used to determine the presence of: - Answer-hydrogen sulfide. What is the average detention time, in minutes, for a 40,000 gpd flow going through a 1,500-gallon interceptor? - Answer-54 minutes The following type of flow measuring device can be installed in a pipe flowing full: - Answer-Venturi. What total volume of spill containment capacity in gallons is needed for the following tanks if a 12- inch rainfall occurs during a 24-hour period on a common 200-foot by 200-foot spill-containment pad? Assume 100 percent containment of all tank capacity is needed. Tank I: Cube, 6 ft wide, 6 ft long, and 6 ft high. Tank II: Rectangular, 4 ft wide, 20 ft long, and 3 ft high. Tank III: Cylindrical, 8 ft in diameter and 9 ft high. - Answer-305,992 gallons An industry has a wastewater discharge of 10,000 gallons per day containing 5 mg/L of copper. What is the industry's mass emission rate of copper in pounds per day? - Answer-0.42 lb/dayWhat kind of container and preservative is required for samples to be analyzed for oil and grease? - Answer-Glass, Cool 4°C, H2SO4 to pH<2 A chain-of-custody form: - Answer-is the ability to trace sample possession and handling from collection through analysis. The BOD determination is an empirical test in which standardized laboratory procedures are used to: - Answer-determine the relative oxygen requirements of wastewaters, effluents, and polluted waters. A confined space is one that: - Answer-is large enough to enter and work in, has a restricted entry/exit, and is not meant for continuous occupancy. Industrial plants producing wastes with a high suspended solids content include: - Answer-breweries