WASTEWATER CLASS B TEXAS FINAL EXAM ACTUAL
QUESTIONS AND ANSWERS GRADED A+
✔✔During heavy rain it is possible that manholes and lift stations may overflow,
discharge waste materials into roadways or ditches. This type of discharge (SSO) would
be - ✔✔considered an unavoidable discharge, a violation of the Texas Water Code, a
bypass that must be reported within 24 hours and considered a health hazard
✔✔An effective way for the collection system worker to prevent infection by waterborn
pathogenic organism is to - ✔✔Wear protective clothing and avoid direct contact with
waste water
✔✔_________will increase the chances that sewage will turn septic - ✔✔Stoppages in
the main line
✔✔Extensive use of garbage disposals (grinders) in a community would likely have the
following effect on the collection system - ✔✔Increase the amount of flow, solids, and
grease
✔✔The minimum size for a gravity flow sewer line on city right-of-way and the minimum
grade is - ✔✔6 inch and a grade of 0.50 percent
✔✔The most accurate way to find the average wastewater flow rate in an existing 10-
inch sewer main is - ✔✔Obtaining actual flow data & verifying with field data
✔✔What is the greatest advantage for using fiberglass manholes in areas with high
groundwater? - ✔✔fiberglass is not subject to infiltration
✔✔A __________ pump would most likely be used when discharging into a 10"
diameter pressure sewer main. - ✔✔Centrifugal
✔✔Excessive power consumption by a pump could be caused by - ✔✔Worn bearings
and worn impeller
✔✔Trench safety is a great concern in Texas. OSHA requires that anytime an
excavation is greater than __ feet deep it must be protected by ______. - ✔✔5 feet / An
approved Trench Box, Shoring, or Sloping
✔✔In an excavation if a ladder is used as a means of exit, it must extend ________feet
above the ground and be secured and within ____ feet laterally of anyone in the
excavation. - ✔✔3 feet / 25 feet laterally
, ✔✔A ____________ would be the best to determine if a storm drain is connected to a
sanitary sewer line. - ✔✔Smoke Test
✔✔_________ would most commonly be used to seal a number of joint leaks on a main
with minimal interruption - ✔✔internal grouting
✔✔Pre-treatment of wastewater would include: - ✔✔Coarse or fine screening, grinding
and grit removal and grease removal and pre-aeration
✔✔Primary treatment of wastewater would include - ✔✔settling tanks or basins, scum
collection and removal, sludge collection and removal
✔✔Secondary treatment typically used today would include - ✔✔Stabilization ponds,
trickling filters, rotating biological contractors (RBC) & activated sludge
✔✔Essential components of the wastewater collection system include - ✔✔Sewer
mains & piping, Lift Stations, Pumps, Grease & Sand traps, & Manholes
✔✔Grit removal would be considered - ✔✔A part of Primary Treatment
✔✔The protozoa that causes dysentery would most likely be destroyed by -
✔✔Disinfection
✔✔Using final plant effluent in cooling towers would be a - ✔✔Beneficial way to reuse
treated effluent
✔✔TCEQ may authorize discharge of untreated wastewater into or near a receiving
stream in extreme cases. This is referred to as - ✔✔Bypass
✔✔Enforcement action from TCEQ may be taken if pollution or waste violates the
Texas Water Code. Violations of Water Code may include - ✔✔Unauthorized discharge,
accidental discharge & health hazard
✔✔Solids in wastewater are classified as - ✔✔Total (TR), Suspended (TSS), Dissolved
(TDS), Settleable (SS), Non-setteable, Floatable, Organic and Inorganic
✔✔Total Suspended Solids (TSS) are those that - ✔✔Can be filtered out
✔✔Total Dissolved Solids (TDS) are those that - ✔✔cannot be filtered out
✔✔Settable Solids (SS) are those that - ✔✔Settle out when left standing for extended
periods of time
QUESTIONS AND ANSWERS GRADED A+
✔✔During heavy rain it is possible that manholes and lift stations may overflow,
discharge waste materials into roadways or ditches. This type of discharge (SSO) would
be - ✔✔considered an unavoidable discharge, a violation of the Texas Water Code, a
bypass that must be reported within 24 hours and considered a health hazard
✔✔An effective way for the collection system worker to prevent infection by waterborn
pathogenic organism is to - ✔✔Wear protective clothing and avoid direct contact with
waste water
✔✔_________will increase the chances that sewage will turn septic - ✔✔Stoppages in
the main line
✔✔Extensive use of garbage disposals (grinders) in a community would likely have the
following effect on the collection system - ✔✔Increase the amount of flow, solids, and
grease
✔✔The minimum size for a gravity flow sewer line on city right-of-way and the minimum
grade is - ✔✔6 inch and a grade of 0.50 percent
✔✔The most accurate way to find the average wastewater flow rate in an existing 10-
inch sewer main is - ✔✔Obtaining actual flow data & verifying with field data
✔✔What is the greatest advantage for using fiberglass manholes in areas with high
groundwater? - ✔✔fiberglass is not subject to infiltration
✔✔A __________ pump would most likely be used when discharging into a 10"
diameter pressure sewer main. - ✔✔Centrifugal
✔✔Excessive power consumption by a pump could be caused by - ✔✔Worn bearings
and worn impeller
✔✔Trench safety is a great concern in Texas. OSHA requires that anytime an
excavation is greater than __ feet deep it must be protected by ______. - ✔✔5 feet / An
approved Trench Box, Shoring, or Sloping
✔✔In an excavation if a ladder is used as a means of exit, it must extend ________feet
above the ground and be secured and within ____ feet laterally of anyone in the
excavation. - ✔✔3 feet / 25 feet laterally
, ✔✔A ____________ would be the best to determine if a storm drain is connected to a
sanitary sewer line. - ✔✔Smoke Test
✔✔_________ would most commonly be used to seal a number of joint leaks on a main
with minimal interruption - ✔✔internal grouting
✔✔Pre-treatment of wastewater would include: - ✔✔Coarse or fine screening, grinding
and grit removal and grease removal and pre-aeration
✔✔Primary treatment of wastewater would include - ✔✔settling tanks or basins, scum
collection and removal, sludge collection and removal
✔✔Secondary treatment typically used today would include - ✔✔Stabilization ponds,
trickling filters, rotating biological contractors (RBC) & activated sludge
✔✔Essential components of the wastewater collection system include - ✔✔Sewer
mains & piping, Lift Stations, Pumps, Grease & Sand traps, & Manholes
✔✔Grit removal would be considered - ✔✔A part of Primary Treatment
✔✔The protozoa that causes dysentery would most likely be destroyed by -
✔✔Disinfection
✔✔Using final plant effluent in cooling towers would be a - ✔✔Beneficial way to reuse
treated effluent
✔✔TCEQ may authorize discharge of untreated wastewater into or near a receiving
stream in extreme cases. This is referred to as - ✔✔Bypass
✔✔Enforcement action from TCEQ may be taken if pollution or waste violates the
Texas Water Code. Violations of Water Code may include - ✔✔Unauthorized discharge,
accidental discharge & health hazard
✔✔Solids in wastewater are classified as - ✔✔Total (TR), Suspended (TSS), Dissolved
(TDS), Settleable (SS), Non-setteable, Floatable, Organic and Inorganic
✔✔Total Suspended Solids (TSS) are those that - ✔✔Can be filtered out
✔✔Total Dissolved Solids (TDS) are those that - ✔✔cannot be filtered out
✔✔Settable Solids (SS) are those that - ✔✔Settle out when left standing for extended
periods of time
