The type of chemical feeder that is most accurate.
What is gravimetric?
100
Spontaneous combustion can occur when activated carbon is mixed with ________.
What are chlorine compounds?
100
The color of total coliform colonies grown on M-Endo broth using the Membrane Filter Technique?
What is red with a green-gold metallic sheen?
100
A system has just had a main break. If the chlorine level of 3.3 mg/L has dropped to 0.3 mg/L . This is the chlorine demand.
What is 3.0 mg/L?
100
Records of lead and copper analysis must be kept for this length of time.
What is 12 years?
200
The typical strength range of sodium hypochlorite.
What is 5-15%?
200
When handling acids in the laboratory this type of eye protection should be worn.
What are goggles?
200
The two most common hardness causing ions.
What are calcium and magnesium.
200
_____ gallons of 15% bleach is required to make 50 gallons of 4 % bleach.
What is 13 gallons?
200
The primary MCL for fluoride.
What is 4 mg/L?
300
The fine sand and a sticky mat of suspended matter that forms on the surface of a sand filter.
What is Schmutzdekke?
300
The primary risk from exposure to trihalomethanes.
What is cancer?
300
The most accurate method of measuring fluoride concentration.
What is the fluoride probe?
300
Find the capacity of a cylindrical tank in gallons if the diameter is
12.8 ft and the height is 15.6 ft.
What is 15,045 gal?
300
The maximum filtration rate for turbidity removal in a dual media filter.
What is 4 gpm/ft2?
400
The adhesion of a gas, liquid or dissolved substance onto the surface or interace zone of another substance.
What is adsorption?
400
The emergency repair kit that should be used to repair a ton cylinder.
What is repair kit B?
400
The incubation temperature for total coliform bacteria.
What is 35 C +/- 0.5 C ?
400
A water plant treats 7.5 MGD. If the chlorine dose needs to be 3 mg/L, This is the amount of chlorine gas required in lbs/day.
What is 188 lbs/day?
400
All water mains designed for fire protection must provide 500 gallons per minute flow with 20 psi residual pressure and be _____ inches or larger in diameter
What is 6 inches?
500
The underground layer of gravel, sand or rock that holds and transmits water.
What is an aquifer?
500
During a confined space entry, the spcae must be monitored for hazardous atmosphere this often.
What is continuously?
500
The type of glassware that is more accurate when measuring volume is which of the following (graduated cylinder or volumetric flask).
What is a volumetric flask?
500
A cork placed in a channel travels 30 feet in 20 seconds. This is the cork's velocity in ft/sec.
What is 1.5 ft/sec?
500
The residual disinfectant level shall not be less than ____ mg/L in more than 5% of samples taken each month