What color are fecal colonies grown on mFC broth using membrane filter technique?
What is blue?
100
Ventilation in dry wells shall provide for at least _____ complete air changes per hour if continuous and intermittent at least _____ per hour.
What is 6 and 30?
100
As the F:M ratio increases, what happens to the sludge age?
What is decreases?
100
Convert 8.60 MGD into cubic feet per second.
What is 13.3 cfs?
100
If a chemical is spilled where can you find the correct procedure to clean up the spill?
What is MSDS?
200
What is the incubation temperature for fecal bacteria?
What is 44.5 +/- 0.2 degrees C?
200
What is a measurement of the energy possessed by water at any point in a hydraulic system?
What is head?
200
What will the addition of chlorine gas to wastewater cause the pH to do?
What is decrease?
200
A cork placed in a channel travels 30 feet in 20 seconds. What is the velocity of the cork in ft/sec?
What is 1.5 ft/sec?
200
What type of fire extinguisher should be used on electrical fires?
What is Class C or carbon dioxide?
300
In order for a BOD analysis to be valid, the dissolved oxygen content in the blanks must not deplete any more than _____ mg/L during the 5-day incubation period.
What is 0.2 mg/L?
300
What will happen to pump efficiency as the impeller wears on a pump?
What is decrease?
300
What is the conditions called taht occurs when nitrate or nitrite ions are reduced to nitrogen gas and bubbles are formed as the result of the process?
What is denitrification?
300
A clarifier has a diameter of 82 feet and a depth of 12 feet. What is the length of the weir around the clarifier in ft?
What is 257 feet?
300
What is the acceptable range for oxygen in a confined space?
What is 19.5-23.5%?
400
What term describes a measure of the capacity of water to neutralize a strong acid?
What is alkalinity?
400
Enclosed, open and semi-closed are terms used for the designation and selection of what?
What is impellers?
400
How can a toxic waste be discovered in a treatment plant?
What is increase in aerator DO?
400
During a 30 minute pumping test, 3680 gallons are pumped into a 10 ft diameter tank that is 12 ft deep. What is the pumping rate in gal/min?
What is 122.7 gpm?
400
What causes a rotten egg odor, can paralyze the respiratory system and is flammable and explosive when mixed with the right amount of air?
What is hydrogen sulfide?
500
In order for a BOD analysis to be valid, the dissolved oxygen content in the sample bottle must deplete at least _____ mg/L during a 5-day incubation period.
What is 2.0 mg/L?
500
This is a spacer ring in a pump-packing gland to improve seal water distribution.
What is a lantern ring?
500
Anaerobic digesters conventionally operate in what system? (psychropilic, saprophylic, thermophilic, mesophilic or atutrophic?)
What is mesophilic?
500
How many gallons of 15% bleach are required to make 50 gallons of 4% bleach?
What is 13 gallons?
500
What is the maximum lateral distance a worker in a trench should have to travel to reach a ladder?