CWEA Environmental Compliance Questions with complete Solutions

CWEA Environmental Compliance Questions with complete Solutions 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? 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? 600, 150, 1450, 2400, 400 Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water Act, are pollutants that: create a fire or explosion hazard in the sewer or POTW. "MSDS" is an acronym for what? Material Safety Data Sheet Safety hazards associated with hydrogen sulfide in sewer systems include: toxic gasses. A significant industrial user can be defined as: a federal categorical industrial user. Lead acetate paper is used to determine the presence of: hydrogen sulfide. What is the average detention time, in minutes, for a 40,000 gpd flow going through a 1,500-gallon interceptor? 54 minutes The following type of flow measuring device can be installed in a pipe flowing full: 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. 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? 0.42 lb/day What kind of container and preservative is required for samples to be analyzed for oil and grease? Glass, Cool 4°C, H2SO4 to pH<2 A chain-of-custody form: 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: determine the relative oxygen requirements of wastewaters, effluents, and polluted waters. A confined space is one that: 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: breweries. Whenever an inspector or sampling technician is in a manhole, how many people should there be above to respond in the event of an emergency? Two Alkalinity is reported as: alkalinity, mg/L CaCO3. What is the normality of sodium hydroxide (NaOH) solution of 25 mL if a 0.01 N sulfuric acid solution neutralizes 100 mL of the NaOH solution? 0.0025 N A major pollutant of concern from a printed circuit board shop is: copper. To find the proper protective gear to use while inspecting an area where a hazardous chemical is used, you would: check the MSDS for chemicals used. Why are gasoline and volatile solvents objectionable when present in a sewer? They can produce an explosion hazard. When inspecting a plating shop, personal protective equipment would include: eye goggles or face shield, chemical resistant gloves, and overalls. A solution with a pH of 5 has a concentration of hydrogen ions that is how many times higher than a solution with a pH of 7? 100 times higher High pH wastewater is neutralized by adding: H2SO4. When working in the street, signs and cones are needed when: over half of the street is blocked. What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? 19.5 percent A common technology to recover chemicals from rinse water include: ion exchange. Is an essential part of any sampling quality control methodology: Proper cleaning techniques for sampling equipment What are the types of stormwater pollution? Sediment,BOD,Nutrients How often must SIUs be inspected? Once a year A solution of ferrous chloride used at a pretreatment facility contains 30 percent ferrous chloride and has a density of 1.33 g/mL. How many grams of ferrous chloride are in one liter of the solution? 399 grams per liter Sodium hydroxide is commonly referred to as: caustic soda. Which of the following does an ultrafiltration system remove from wastewater? suspended solids. Low pH wstewater is neutralized by adding: NaOH. A solution with a pH of 5 has a concentration of hydrogen ions that is how many times higher than a solution with a pH of 7? 100 times higher What is the normality of a sodium hydroxide solution of 25 ml if 0.01 N sulfuric acid solution neutralizes 100 mL of the NaOH solution? 0.0025 N A cyanide destruction process is designed to treat 30 pounds of cyanide per 24-hour operational day. How many pounds of cyanide can be treated during an 8-hour shift? 10 A POTW must retain Industrial User records for a minimum of: 3 years The Federal Act that introduced the concept of cradle to grave manifesting for hazardous waste products is: Resource Conservation and Recovery Act (RCRA). Waste discharge regulations can be concentration- or mass-based except for: pH and temperature. New Categorical Dischargers must submit a Baseline Monitoring Report to the POTW control authority prior to the planned commencement of discharge by at least: 90 days