Operations
The type of chemical feeder that is most accurate.
What is gravimetric?
Spontaneous combustion can occur when activated carbon is mixed with ________.
What are chlorine compounds?
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?
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?
Records of lead and copper analysis must be kept for this length of time.
What is 12 years?
The typical strength range of sodium hypochlorite.
What is 5-15%?
When handling acids in the laboratory this type of eye protection should be worn.
What are goggles?
The two most common hardness causing ions.
What are calcium and magnesium.
____ gallons of 15% bleach is required to make 50 gallons of 4 % bleach.
What is 13 gallons?
The primary MCL for fluoride.
What is 4 mg/L?
The fine sand and a sticky mat of suspended matter that forms on the surface of a sand filter.
What is Schmutzdekke?
The primary risk from exposure to trihalomethanes.
What is cancer?
The most accurate method of measuring fluoride concentration.
What is the fluoride probe?
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?
The maximum filtration rate for turbidity removal in a dual media filter.
What is 4 gpm/ft2?
The adhesion of a gas, liquid or dissolved substance onto the surface or interface zone of another substance.
What is adsorption?
The emergency repair kit that should be used to repair a ton cylinder.
What is repair kit B?
The incubation temperature for total coliform bacteria.
What is 35 C +/- 0.5 C?
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?
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?
The underground layer of gravel, sand or rock that holds and transmits water.
What is an aquifer?
During a confined space entry, the space must be monitored for hazardous atmosphere this often.
What is continuously?
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?
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?
The residual disinfectant level shall not be less than ____ mg/L in more than 5% of samples taken each month
What is 0.2 mg/L?