WASTEWATER GRADE FOUR
COMPREHENSIVE TEST BANK 2026
VERIFIED QUESTIONS AND ANSWERS
●● population equivalents. Answer: 100 lbs wastewater per day, .2 lbs
TSS/day, .17 BOD/day
●● industrial wastewater. Answer: Comes from industries. Compatible
wastes can be processed by the plant. Incompatible wastes are toxic to
the plant.
●● sanitary wastewater. Answer: The combined domestic and industrial
waste waters from community.
●● storm water. Answer: Water that runs off roads, parking lots, and
other impervious surfaces during rain and snow storms
●● sanitary sewers. Answer: Convey domestic and industrial waste
waters, typically from where they are generated to the plant.
●● storm sewers. Answer: Convey storm water, typically from storm
drains directly to a point of discharge (stream, river, ocean).
, ●● combined sewers. Answer: Convey sanitary waste water combined
with storm water.
●● Reasons to collect samples. Answer: federal and state regulatory
compliance, process control, trouble shooting, special studies including
future designs.
●● grab sample. Answer: One time sample. Chlorine residual, coliform
tests, settable solids, dissolved oxygen, pH, grease and oil, sulfide tests.
●● Time based composite sample. Answer: Fixed volume of sample is
collected after passage of a set amount of time over a certain time
period.
●● Flow based composite sample. Answer: Fixed volume of sample is
collected after a prescribed amount of flow has passed through the
sampling point, or a volume of sample proportional to the flow is
collected after passage of a prescribed amount of time over a certain
time period. This sample can also be called a flow proportional
composite sample.
●● diurnal flow. Answer: Low at night between 2 and 5 am, steady steep
increase in flow starting after 5 am, reaching first peak in the late
morning or early afternoon, slight decrease through the afternoon,
second peak between 6 and 9 pm, and a tapering off of to the low flows
of 2 am.
COMPREHENSIVE TEST BANK 2026
VERIFIED QUESTIONS AND ANSWERS
●● population equivalents. Answer: 100 lbs wastewater per day, .2 lbs
TSS/day, .17 BOD/day
●● industrial wastewater. Answer: Comes from industries. Compatible
wastes can be processed by the plant. Incompatible wastes are toxic to
the plant.
●● sanitary wastewater. Answer: The combined domestic and industrial
waste waters from community.
●● storm water. Answer: Water that runs off roads, parking lots, and
other impervious surfaces during rain and snow storms
●● sanitary sewers. Answer: Convey domestic and industrial waste
waters, typically from where they are generated to the plant.
●● storm sewers. Answer: Convey storm water, typically from storm
drains directly to a point of discharge (stream, river, ocean).
, ●● combined sewers. Answer: Convey sanitary waste water combined
with storm water.
●● Reasons to collect samples. Answer: federal and state regulatory
compliance, process control, trouble shooting, special studies including
future designs.
●● grab sample. Answer: One time sample. Chlorine residual, coliform
tests, settable solids, dissolved oxygen, pH, grease and oil, sulfide tests.
●● Time based composite sample. Answer: Fixed volume of sample is
collected after passage of a set amount of time over a certain time
period.
●● Flow based composite sample. Answer: Fixed volume of sample is
collected after a prescribed amount of flow has passed through the
sampling point, or a volume of sample proportional to the flow is
collected after passage of a prescribed amount of time over a certain
time period. This sample can also be called a flow proportional
composite sample.
●● diurnal flow. Answer: Low at night between 2 and 5 am, steady steep
increase in flow starting after 5 am, reaching first peak in the late
morning or early afternoon, slight decrease through the afternoon,
second peak between 6 and 9 pm, and a tapering off of to the low flows
of 2 am.
