Texas Wastewater Class A
(All of the above) have a chlorine residual, have a previously been chlorinated, have been subjected to
high temperatures, contain high or low pH industrial wastes - answers✔✔Seeding of BOD samples is
necessary when samples
Summer - answers✔✔When is blue-green algae the most dominant on a pond treatment system?
c. 2,200 gallons per minute - answers✔✔A 30-inch diameter wastewater interceptor is observed to be
flowing half-full at about two fps. The approximate volume of wastewater flowing through the pipe is
3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 = 2,200 gpm
60 minutes - answers✔✔A one-cylinder reciprocating sludge pump with a 10-inch bore and a 5-inch
stroke pumps at a rate of 50 cycles per minute. How many minutes must the pump be operated to
pump 5,000 gallons of sludge? 3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min 84.5
gpm b. 29
95 percent - answers✔✔If an existing centrifugal pump motor is replaced with a motor with 25 percent
more speed, the motor horsepower required will increase by 1.25 x 1.25 x 1.25 = 1.95
Before construction - answers✔✔When must TCEQ be notified about expansions of a treatment facility?
70% methane, 30% carbon dioxide - answers✔✔In an anaerobic digester, the percentage of methane
and carbon dioxide gas content should be
95° F - answers✔✔The temperature of an anaerobic digester should be maintained at a minimum of
Extended air - answers✔✔What type of wastewater treatment operates in the endogenous bacteria
growth phase?
,Keep the media wet Further reduce BOD All of the above (a, b, and c) - answers✔✔Why is recirculation
needed in a trickling filter?
Class A Class C (a and d) - answers✔✔What type of fire extinguisher would be used on an electrical
control panel that has been de-energized?
6 - answers✔✔Disinfection with chlorine is the most effective at a pH of
Grey to brown and 0.05 to 0.1 inch thick - answers✔✔The biomass on a normal functioning RBC has
what appearance?
4% to 6% - answers✔✔The sludge from a primary clarifier should percent solids?
Enrichment with nitrogen and phosphorous Causes algae blooms (b and c) - answers✔✔What is
eutrophication in a pond system?
Daily - answers✔✔How often should pH meters be calibrated?
two - answers✔✔In Texas, pH meters are required to be calibrated on how many buffers?
2941 - answers✔✔An industrial complex has a BOD discharge to the POTW of 500 pounds per day. The
population equivalent of this industry is 500 lbs = 2,941 0.17 lbs BOD person
5 days at 20° Centigrade - answers✔✔The parameters of the BOD test are
Ratio of OD pipe diameter to wall thickness - answers✔✔Standard Dimension Ratio in pvc pipe is
defined as
up from the bottom up - answers✔✔How should shoring be removed from a trench?
, part of the collection system and the responsibility of the utility - answers✔✔In low pressure sewer
systems where each tap must have a grinder pump lift station, station is considered to be
being a good listener - answers✔✔Effective communication depends on
50 - answers✔✔When designing a wastewater collection system, the engineer considers the population
for how many years in the future?
150 - answers✔✔According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure
shall have a minimum psi pressure rating of
2.0 fps - answers✔✔The minimum velocity of flow in a wastewater line should be
increase - answers✔✔At a construction job site, as the roadway speed increases, the spacing between
cones and barricades should
roots and grease - answers✔✔The major cause of wastewater line stoppages is
tightness in the chest nausea drowsiness and headache (all of the above) - answers✔✔Carbon
monoxide (CO) poisoning symptoms are
1 inch - answers✔✔The smallest pipe size for air recirculation of a self-priming centrifugal pump is
some gases have no odor some gases may deaden the sense of smell some gases may displace the
oxygen (all of the above) - answers✔✔Dangerous gases in a confined space may not be detected with
the physical senses because
CO2 CO НaS CH4 (all of the above) - answers✔✔What are the dangerous gases a collection system
worker might come into contact with?
10 - answers✔✔On a construction job site, equipment booms must maintain at least how many feet of
clearance from overhead electric lines?
(All of the above) have a chlorine residual, have a previously been chlorinated, have been subjected to
high temperatures, contain high or low pH industrial wastes - answers✔✔Seeding of BOD samples is
necessary when samples
Summer - answers✔✔When is blue-green algae the most dominant on a pond treatment system?
c. 2,200 gallons per minute - answers✔✔A 30-inch diameter wastewater interceptor is observed to be
flowing half-full at about two fps. The approximate volume of wastewater flowing through the pipe is
3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 = 2,200 gpm
60 minutes - answers✔✔A one-cylinder reciprocating sludge pump with a 10-inch bore and a 5-inch
stroke pumps at a rate of 50 cycles per minute. How many minutes must the pump be operated to
pump 5,000 gallons of sludge? 3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min 84.5
gpm b. 29
95 percent - answers✔✔If an existing centrifugal pump motor is replaced with a motor with 25 percent
more speed, the motor horsepower required will increase by 1.25 x 1.25 x 1.25 = 1.95
Before construction - answers✔✔When must TCEQ be notified about expansions of a treatment facility?
70% methane, 30% carbon dioxide - answers✔✔In an anaerobic digester, the percentage of methane
and carbon dioxide gas content should be
95° F - answers✔✔The temperature of an anaerobic digester should be maintained at a minimum of
Extended air - answers✔✔What type of wastewater treatment operates in the endogenous bacteria
growth phase?
,Keep the media wet Further reduce BOD All of the above (a, b, and c) - answers✔✔Why is recirculation
needed in a trickling filter?
Class A Class C (a and d) - answers✔✔What type of fire extinguisher would be used on an electrical
control panel that has been de-energized?
6 - answers✔✔Disinfection with chlorine is the most effective at a pH of
Grey to brown and 0.05 to 0.1 inch thick - answers✔✔The biomass on a normal functioning RBC has
what appearance?
4% to 6% - answers✔✔The sludge from a primary clarifier should percent solids?
Enrichment with nitrogen and phosphorous Causes algae blooms (b and c) - answers✔✔What is
eutrophication in a pond system?
Daily - answers✔✔How often should pH meters be calibrated?
two - answers✔✔In Texas, pH meters are required to be calibrated on how many buffers?
2941 - answers✔✔An industrial complex has a BOD discharge to the POTW of 500 pounds per day. The
population equivalent of this industry is 500 lbs = 2,941 0.17 lbs BOD person
5 days at 20° Centigrade - answers✔✔The parameters of the BOD test are
Ratio of OD pipe diameter to wall thickness - answers✔✔Standard Dimension Ratio in pvc pipe is
defined as
up from the bottom up - answers✔✔How should shoring be removed from a trench?
, part of the collection system and the responsibility of the utility - answers✔✔In low pressure sewer
systems where each tap must have a grinder pump lift station, station is considered to be
being a good listener - answers✔✔Effective communication depends on
50 - answers✔✔When designing a wastewater collection system, the engineer considers the population
for how many years in the future?
150 - answers✔✔According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure
shall have a minimum psi pressure rating of
2.0 fps - answers✔✔The minimum velocity of flow in a wastewater line should be
increase - answers✔✔At a construction job site, as the roadway speed increases, the spacing between
cones and barricades should
roots and grease - answers✔✔The major cause of wastewater line stoppages is
tightness in the chest nausea drowsiness and headache (all of the above) - answers✔✔Carbon
monoxide (CO) poisoning symptoms are
1 inch - answers✔✔The smallest pipe size for air recirculation of a self-priming centrifugal pump is
some gases have no odor some gases may deaden the sense of smell some gases may displace the
oxygen (all of the above) - answers✔✔Dangerous gases in a confined space may not be detected with
the physical senses because
CO2 CO НaS CH4 (all of the above) - answers✔✔What are the dangerous gases a collection system
worker might come into contact with?
10 - answers✔✔On a construction job site, equipment booms must maintain at least how many feet of
clearance from overhead electric lines?
