CWEA Environmental Compliance Exam Question And Revised Answers

CWEA Environmental Compliance Exam Question And Revised Answers 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? - answers11.1 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? - answers600, 150, 1450, 2400, 400 Prohibited discharges from industrial users to POTWs, as stipulated in the Clean Water Act, are pollutants that: - answerscreate a fire or explosion hazard in the sewer or POTW. "MSDS" is an acronym for what? - answersMaterial Safety Data Sheet Safety hazards associated with hydrogen sulfide in sewer systems include: - answerstoxic gasses. A significant industrial user can be defined as: - answersa federal categorical industrial user. Lead acetate paper is used to determine the presence of: - answershydrogen sulfide. What is the average detention time, in minutes, for a 40,000 gpd flow going through a 1,500-gallon interceptor? - answers54 minutes The following type of flow measuring device can be installed in a pipe flowing full: - answersVenturi. 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. - answers305,992 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? - answers0.42 lb/day What kind of container and preservative is required for samples to be analyzed for oil and grease? - answersGlass, Cool 4°C, H2SO4 to pH2 A chain-of-custody form: - answersis 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: - answersdetermine the relative oxygen requirements of wastewaters, effluents, and polluted waters. A confined space is one that: - answersis 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: - answersbreweries. 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? - answersTwo Alkalinity is reported as: - answersalkalinity, 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? - answers0.0025 N A major pollutant of concern from a printed circuit board shop is: - answerscopper. To find the proper protective gear to use while inspecting an area where a hazardous chemical is used, you would: - answerscheck the MSDS for chemicals used. Why are gasoline and volatile solvents objectionable when present in a sewer? - answersThey can produce an explosion hazard. When inspecting a plating shop, personal protective equipment would include: - answerseye 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? - answers100 times higher High pH wastewater is neutralized by adding: - answersH2SO4. When working in the street, signs and cones are needed when: - answersover half of the street is blocked. What is the danger of asphyxiation set point for oxygen on an atmospheric monitor? - answers19.5 percent A common technology to recover chemicals from rinse water include: - answersion exchange. Is an essential part of any sampling quality control methodology: - answersProper cleaning techniques for sampling equipment What are the types of stormwater pollution? - answersSediment,BOD,Nutrients How often must SIUs be inspected? - answersOnce 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? - answers399 grams per liter Sodium hydroxide is commonly referred to as: - answerscaustic soda. Which of the following does an ultrafiltration system remove from wastewater? - answerssuspended solids. Low pH wstewater is neutralized by adding: - answersNaOH. 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? - answers100 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? - answers0.0025 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? - answers10 A POTW must retain Industrial User records for a minimum of: - answers3 years The Federal Act that introduced the concept of cradle to grave manifesting for hazardous waste products is: - answersResource Conservation and Recovery Act (RCRA).