CSLB CONCRETE UPDATED ACTUAL EXAM QUESTIONS CORRECT ANSWERS GRADED A
PLUS
Question:
Which of the following is true if porous media in a standard drainfield?
Answer:
It should be uniform in size, it should be 0.75 inch to 2 inches in size, it should be clean and resistant
to breakdown
Question:
A standard drainfield excavation should.
Answer:
be level within 1 inch per 25 feet or a maximum of 3 inches whichever is less
Question:
A standard perforated drainline should be which of the following?
Answer:
3 inches to 4 inches in diameter, a maximum length of 150 feet, laid parallel in multiple-line system
Question:
The purpose of the geotextile fabric over gravel is to.
Answer:
prevent backfill from entering porous media
Question:
,A pumped effluent drainfield.
Answer:
is an alternative for well-drained clay soils on nearly level sites, has a 2% or less slope for
single-family dwellings only
Question:
Which of the following must be known prior to actually laying out a new OSSF?
Answer:
building location, size of the property, soil conditions in the drainfield
Question:
In an unlined ET system, wastewater is disposed of by which of the following?
Answer:
evaporation, transpiration, soil absorption
Question:
A gravelless pipe drainfield.
Answer:
can be backfilled with Class Ib, II, or III soil
Question:
A leaching chamber system.
Answer:
requires 25% less absorptive area than a standard system for new construction
Question:
Aerobic treatment units.
,Answer:
utilize aerobic bacteria and oxygen to break down complex organics and produce carbon dioxide
Question:
To determine if a proprietary aerobic treatment unit is appropriate for use with surface application
disposal it must.
Answer:
be on the TCEQ's most recently approved list
Question:
To determine the minimum size of aerobic treatment unit needed for a particular home, one must
know.
Answer:
number of bedrooms and square feet in the home and refer to TCEQ Table II
Question:
Which of the following is a likely cause of a "rotten egg" odor from an aerobic treatment plant?
Answer:
Mechanical aerator failure, hydraulic overload caused by leaking toilet
Question:
Which of the following is a way to evaluate an aerobic treatment plant for excessive solids and need
for wasting?
Answer:
30-minute settling test
Question:
, Which of the following is true of standard intermittent sand filter?
Answer:
provides secondary wastewater treatment, has a maximum surface loading rate of 1.2 gal/day/sqft,
requires at least 24 inches of filter media which meets definite specifications (ASTM C-33)
Question:
When would an intermittent sand filter with disinfection system be selected over a properly
designed and installed septic tank system?
Answer:
For a standard drainfield in class Ia soil
Question:
Trickling filters and wetlands.
Answer:
are secondary treatment processes
Question:
Which of the following considerations should receive the greatest emphasis in selecting a type of
OSSF disposal option?
Answer:
soil and site conditions
Question:
On a West Texas site with 16 inches of Class Ia soil over fractured rock, suitable OSSFs would
include.
Answer:
lined ET or mound systems
PLUS
Question:
Which of the following is true if porous media in a standard drainfield?
Answer:
It should be uniform in size, it should be 0.75 inch to 2 inches in size, it should be clean and resistant
to breakdown
Question:
A standard drainfield excavation should.
Answer:
be level within 1 inch per 25 feet or a maximum of 3 inches whichever is less
Question:
A standard perforated drainline should be which of the following?
Answer:
3 inches to 4 inches in diameter, a maximum length of 150 feet, laid parallel in multiple-line system
Question:
The purpose of the geotextile fabric over gravel is to.
Answer:
prevent backfill from entering porous media
Question:
,A pumped effluent drainfield.
Answer:
is an alternative for well-drained clay soils on nearly level sites, has a 2% or less slope for
single-family dwellings only
Question:
Which of the following must be known prior to actually laying out a new OSSF?
Answer:
building location, size of the property, soil conditions in the drainfield
Question:
In an unlined ET system, wastewater is disposed of by which of the following?
Answer:
evaporation, transpiration, soil absorption
Question:
A gravelless pipe drainfield.
Answer:
can be backfilled with Class Ib, II, or III soil
Question:
A leaching chamber system.
Answer:
requires 25% less absorptive area than a standard system for new construction
Question:
Aerobic treatment units.
,Answer:
utilize aerobic bacteria and oxygen to break down complex organics and produce carbon dioxide
Question:
To determine if a proprietary aerobic treatment unit is appropriate for use with surface application
disposal it must.
Answer:
be on the TCEQ's most recently approved list
Question:
To determine the minimum size of aerobic treatment unit needed for a particular home, one must
know.
Answer:
number of bedrooms and square feet in the home and refer to TCEQ Table II
Question:
Which of the following is a likely cause of a "rotten egg" odor from an aerobic treatment plant?
Answer:
Mechanical aerator failure, hydraulic overload caused by leaking toilet
Question:
Which of the following is a way to evaluate an aerobic treatment plant for excessive solids and need
for wasting?
Answer:
30-minute settling test
Question:
, Which of the following is true of standard intermittent sand filter?
Answer:
provides secondary wastewater treatment, has a maximum surface loading rate of 1.2 gal/day/sqft,
requires at least 24 inches of filter media which meets definite specifications (ASTM C-33)
Question:
When would an intermittent sand filter with disinfection system be selected over a properly
designed and installed septic tank system?
Answer:
For a standard drainfield in class Ia soil
Question:
Trickling filters and wetlands.
Answer:
are secondary treatment processes
Question:
Which of the following considerations should receive the greatest emphasis in selecting a type of
OSSF disposal option?
Answer:
soil and site conditions
Question:
On a West Texas site with 16 inches of Class Ia soil over fractured rock, suitable OSSFs would
include.
Answer:
lined ET or mound systems
