WASTEWATER COLLECTIONS III QUESTIONS AND
SOLUTIONS RATED A+
✔✔what are the criteria for selecting correct type of pipe? - ✔✔1. chemical
characteristics of water in the pipe
2. characteristics of industrial waste
3. possibility of septic conditions
4. exclusion of infiltration
5. external forces
6. internal forces
7. abrasion
✔✔what is the minimum velocity acceptable in the collection system? - ✔✔2ft per
second
(desirable flow is 3 -5ft per second)
✔✔a drop manhole is used when?
a. one of the choices had something to do with a 24 inch drop
b. the line velocity is greater than 10ft per sec. and the drop manhole is used to slow it
down.
c. ???
d. both a and d - ✔✔a. the sewer main entering the manhole is more than 24 inch
above the floor of the manhole........ or
b. the velocity is the sewer is more than 10ft per sec. which coukd result in damage to
the line from shock or erosion. and the drop manhole is used to slow it
✔✔what is the most common pump found in the collection system?
a. air
b. diaphragm
c. centrifugal
d. inclined pump - ✔✔c. centrifugal
✔✔what is the purpose of a sanitary sewer evaluation? - ✔✔sewer system evaluation
survey is a systematic examination of tributary sewer systems or sub-sections of the
tributary sewer system that have demonstrated possible excessive inflow and
infiltration. examination will determine the location, flow rate and cost of correction for
each definable element of the total inflow and infiltration problem.
✔✔a construction job saftey list typically contains? - ✔✔pre-dig procedures, inspect
area before digging to determine trench and shore safety measures, get locates,
arrange with others to move, protect or relocate utilities, make sure that what utilities are
lrft are properly protected, the person responsible for trench slope and or shoring should
, inspect shoring materials, make sure to have a designated top man to watch out for
people in hole, always have a supervisor designating acting supervisor at the job site at
all times.
✔✔what are the symptoms of carbon monoxide poisoning?
a. headache
b. dizziness
c. drowsy
d. all of the above - ✔✔d. all of the above
toxic symptoms. headache, mental dullness, dizziness, weakness, nausea, vomiting,
loss of muscular control, increased then decreased pulse, unconscious, death
✔✔what are the symptoms of excessive carbon dioxide? - ✔✔unconscious
✔✔who must be notified according to the osha hazardous communications regulations?
a. individuals who work with chemicals once a week
b. individuals who work with chemicals once a month
c. everyone in the organization - ✔✔c. everyone in the organization
✔✔in a pressure sewer system where there are grinder pumps on every residence who
owns the grinder pump?
a. the respective resident
b. the collection system
c. ??? - ✔✔b. the collection system.
✔✔what is the primary concern of a sewer rehabilitation program? - ✔✔first step to
define a rehab program is to develop a comprehensive, written description of the major
parts of your collection system, then analyze the condition of the system, set goals for
rehab program
✔✔which of the following are hydraulic sewer cleaning devices? - ✔✔balls, kites, bags
and shielded scooters
✔✔what is the correct height of the shoring when trench shoring?
a. the shoring extends just below the lipof the trench
b. the shoring is even with the top if the trench
c. the shoring extends two feet above the top of the trench - ✔✔c. the shoring extends
two feet above the top of the trench
✔✔ wastewater force main pressure rating is.
SOLUTIONS RATED A+
✔✔what are the criteria for selecting correct type of pipe? - ✔✔1. chemical
characteristics of water in the pipe
2. characteristics of industrial waste
3. possibility of septic conditions
4. exclusion of infiltration
5. external forces
6. internal forces
7. abrasion
✔✔what is the minimum velocity acceptable in the collection system? - ✔✔2ft per
second
(desirable flow is 3 -5ft per second)
✔✔a drop manhole is used when?
a. one of the choices had something to do with a 24 inch drop
b. the line velocity is greater than 10ft per sec. and the drop manhole is used to slow it
down.
c. ???
d. both a and d - ✔✔a. the sewer main entering the manhole is more than 24 inch
above the floor of the manhole........ or
b. the velocity is the sewer is more than 10ft per sec. which coukd result in damage to
the line from shock or erosion. and the drop manhole is used to slow it
✔✔what is the most common pump found in the collection system?
a. air
b. diaphragm
c. centrifugal
d. inclined pump - ✔✔c. centrifugal
✔✔what is the purpose of a sanitary sewer evaluation? - ✔✔sewer system evaluation
survey is a systematic examination of tributary sewer systems or sub-sections of the
tributary sewer system that have demonstrated possible excessive inflow and
infiltration. examination will determine the location, flow rate and cost of correction for
each definable element of the total inflow and infiltration problem.
✔✔a construction job saftey list typically contains? - ✔✔pre-dig procedures, inspect
area before digging to determine trench and shore safety measures, get locates,
arrange with others to move, protect or relocate utilities, make sure that what utilities are
lrft are properly protected, the person responsible for trench slope and or shoring should
, inspect shoring materials, make sure to have a designated top man to watch out for
people in hole, always have a supervisor designating acting supervisor at the job site at
all times.
✔✔what are the symptoms of carbon monoxide poisoning?
a. headache
b. dizziness
c. drowsy
d. all of the above - ✔✔d. all of the above
toxic symptoms. headache, mental dullness, dizziness, weakness, nausea, vomiting,
loss of muscular control, increased then decreased pulse, unconscious, death
✔✔what are the symptoms of excessive carbon dioxide? - ✔✔unconscious
✔✔who must be notified according to the osha hazardous communications regulations?
a. individuals who work with chemicals once a week
b. individuals who work with chemicals once a month
c. everyone in the organization - ✔✔c. everyone in the organization
✔✔in a pressure sewer system where there are grinder pumps on every residence who
owns the grinder pump?
a. the respective resident
b. the collection system
c. ??? - ✔✔b. the collection system.
✔✔what is the primary concern of a sewer rehabilitation program? - ✔✔first step to
define a rehab program is to develop a comprehensive, written description of the major
parts of your collection system, then analyze the condition of the system, set goals for
rehab program
✔✔which of the following are hydraulic sewer cleaning devices? - ✔✔balls, kites, bags
and shielded scooters
✔✔what is the correct height of the shoring when trench shoring?
a. the shoring extends just below the lipof the trench
b. the shoring is even with the top if the trench
c. the shoring extends two feet above the top of the trench - ✔✔c. the shoring extends
two feet above the top of the trench
✔✔ wastewater force main pressure rating is.
