CSLB CONCRETE ACTUAL TEST PAPER 2026
QUESTIONS WITH SOLUTIONS GRADED A+
▶ 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
▶ A standard drainfield excavation should. Answer: be level within 1 inch
per 25 feet or a maximum of 3 inches whichever is less
▶ 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
▶ The purpose of the geotextile fabric over gravel is to. Answer: prevent
backfill from entering porous media
▶ 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
▶ 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
▶ In an unlined ET system, wastewater is disposed of by which of the
following?. Answer: evaporation, transpiration, soil absorption
▶ A gravelless pipe drainfield. Answer: can be backfilled with Class Ib, II,
or III soil
▶ A leaching chamber system. Answer: requires 25% less absorptive area
than a standard system for new construction
▶ Aerobic treatment units. Answer: utilize aerobic bacteria and oxygen to
break down complex organics and produce carbon dioxide
,▶ 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
▶ 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
▶ 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
▶ 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
▶ 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)
▶ 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
▶ Trickling filters and wetlands. Answer: are secondary treatment
processes
▶ Which of the following considerations should receive the greatest
emphasis in selecting a type of OSSF disposal option?. Answer: soil and
site conditions
▶ 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
▶ What are the minimum soil requirements for leaching chambers or
gravelless pipe systems following a septic tank?. Answer: The same as for
a standard absorptive drainfield, 2 feet of well-drained Class Ib, II, or III soil
below the field bottom
, ▶ OSSF surface application always requires. Answer: at least secondary
treatment and disinfection
▶ Surface application is often selected over other OSSF disposal options
because of. Answer: clay soils and/or seasonal groundwater problems
▶ What must be known to determine the size of spray area required for an
OSSF spray irrigation system?. Answer: Rate of irrigation (Ri) allowed in
that area and (Q) in gal/day
▶ Systems that routinely require a pump tank include. Answer: surface and
drip irrigation and sand filters
▶ The setback from a public water well for an aerobic plant is. Answer: 50
feet
▶ A maintenance provider for a surface application OSSF using a
proprietary aerobic plant must have an employee who is. Answer: a
licensed maintenance provider or a registered maintenance technician
▶ OSSF disposal systems that are routinely required to have maintenance
contracts are. Answer: surface and subsurface drip irrigation
▶ What is the purpose of requiring an affidavit to be filed with the county
real property records for a surface application system?. Answer: to notify
future property owners of the type of OSSF used and the maintenance
requirements
▶ When a maintenance contract is required for a single-family residence
OSSF, the minimum frequency of site visits and type of testing is. Answer:
once every four months with chlorine residual or fecal coliform testing
▶ Required samples for testing from a surface application system are
collected from. Answer: the pump tank effluent line port
▶ An LPD system for a new three-bedroom home with 2200 Sq ft (having
water-saving devices) with 9-inch-wide trenches with 1 foot of gravel depth
installed in Class III soil would require __________ linear feet of dosing
pipe.. Answer: 400
QUESTIONS WITH SOLUTIONS GRADED A+
▶ 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
▶ A standard drainfield excavation should. Answer: be level within 1 inch
per 25 feet or a maximum of 3 inches whichever is less
▶ 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
▶ The purpose of the geotextile fabric over gravel is to. Answer: prevent
backfill from entering porous media
▶ 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
▶ 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
▶ In an unlined ET system, wastewater is disposed of by which of the
following?. Answer: evaporation, transpiration, soil absorption
▶ A gravelless pipe drainfield. Answer: can be backfilled with Class Ib, II,
or III soil
▶ A leaching chamber system. Answer: requires 25% less absorptive area
than a standard system for new construction
▶ Aerobic treatment units. Answer: utilize aerobic bacteria and oxygen to
break down complex organics and produce carbon dioxide
,▶ 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
▶ 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
▶ 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
▶ 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
▶ 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)
▶ 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
▶ Trickling filters and wetlands. Answer: are secondary treatment
processes
▶ Which of the following considerations should receive the greatest
emphasis in selecting a type of OSSF disposal option?. Answer: soil and
site conditions
▶ 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
▶ What are the minimum soil requirements for leaching chambers or
gravelless pipe systems following a septic tank?. Answer: The same as for
a standard absorptive drainfield, 2 feet of well-drained Class Ib, II, or III soil
below the field bottom
, ▶ OSSF surface application always requires. Answer: at least secondary
treatment and disinfection
▶ Surface application is often selected over other OSSF disposal options
because of. Answer: clay soils and/or seasonal groundwater problems
▶ What must be known to determine the size of spray area required for an
OSSF spray irrigation system?. Answer: Rate of irrigation (Ri) allowed in
that area and (Q) in gal/day
▶ Systems that routinely require a pump tank include. Answer: surface and
drip irrigation and sand filters
▶ The setback from a public water well for an aerobic plant is. Answer: 50
feet
▶ A maintenance provider for a surface application OSSF using a
proprietary aerobic plant must have an employee who is. Answer: a
licensed maintenance provider or a registered maintenance technician
▶ OSSF disposal systems that are routinely required to have maintenance
contracts are. Answer: surface and subsurface drip irrigation
▶ What is the purpose of requiring an affidavit to be filed with the county
real property records for a surface application system?. Answer: to notify
future property owners of the type of OSSF used and the maintenance
requirements
▶ When a maintenance contract is required for a single-family residence
OSSF, the minimum frequency of site visits and type of testing is. Answer:
once every four months with chlorine residual or fecal coliform testing
▶ Required samples for testing from a surface application system are
collected from. Answer: the pump tank effluent line port
▶ An LPD system for a new three-bedroom home with 2200 Sq ft (having
water-saving devices) with 9-inch-wide trenches with 1 foot of gravel depth
installed in Class III soil would require __________ linear feet of dosing
pipe.. Answer: 400
