CSLB CONCRETE FULL SOLUTION SCRIPT 2026
QUESTIONS WITH ANSWERS GRADED A+
▶ 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
▶ An important part of the installation of an LPD system is. Answer:
checking and adjusting pressure on lines
▶ Drip irrigation systems are most sensitive to which type of contaminant?.
Answer: suspended solids
, ▶ A drip irrigation system must. Answer: be equipped with mechanisms to
flush from the drainfield back to the treatment unit or pump tank
▶ A mound or soil substitution drainfield is often used. Answer: when
existing soils will not provide adequate treatment due to depth or texture
▶ How many cubic yards of ASTMC-33 sand media must be purchased for
an intermittent sand filter treating wastewater from a new four bedroom
home (with water-saving devices) in order to meet minimum state
requirements?. Answer: 18.5
▶_______ and ________ soil textural classes are always unsuitable for
standard absorptive OSSF. Answer: class IA and IV
▶ List each of the major soil horizons. Answer: surface soil A, surface soil
B, and parent material
▶ _____________ is a term describing the ability of water to migrate
through a soil profile under either _________ or __________ conditions..
Answer: Hydraulic conductivity, saturated, unsaturated
▶ Interconnected pores in the soil profile allow ______ and _______ to
enter the soil at its surface and migrate downward. Answer: air, water
▶ List the four components of soil. Answer: air, water, organics, inorganics
▶ A drainfield is 50 feet by 90 feet and must be covered with an average of
15 inches of sand loam. How many cubic yards of sandy loam soil must be
purchased (find the volume of a rectangular object)?. Answer: 208.3 cubic
yards
▶ What would be the volume of a 5-foot-diameter pump tank that is 5 feet
tall with the inlet 1 foot below the rim?. Answer: 587 gals
▶ What would be the percent slope on a lot 250 feet deep that drops 20
feet in elevation over the depth of the lot?. Answer: 8%
QUESTIONS WITH ANSWERS GRADED A+
▶ 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
▶ An important part of the installation of an LPD system is. Answer:
checking and adjusting pressure on lines
▶ Drip irrigation systems are most sensitive to which type of contaminant?.
Answer: suspended solids
, ▶ A drip irrigation system must. Answer: be equipped with mechanisms to
flush from the drainfield back to the treatment unit or pump tank
▶ A mound or soil substitution drainfield is often used. Answer: when
existing soils will not provide adequate treatment due to depth or texture
▶ How many cubic yards of ASTMC-33 sand media must be purchased for
an intermittent sand filter treating wastewater from a new four bedroom
home (with water-saving devices) in order to meet minimum state
requirements?. Answer: 18.5
▶_______ and ________ soil textural classes are always unsuitable for
standard absorptive OSSF. Answer: class IA and IV
▶ List each of the major soil horizons. Answer: surface soil A, surface soil
B, and parent material
▶ _____________ is a term describing the ability of water to migrate
through a soil profile under either _________ or __________ conditions..
Answer: Hydraulic conductivity, saturated, unsaturated
▶ Interconnected pores in the soil profile allow ______ and _______ to
enter the soil at its surface and migrate downward. Answer: air, water
▶ List the four components of soil. Answer: air, water, organics, inorganics
▶ A drainfield is 50 feet by 90 feet and must be covered with an average of
15 inches of sand loam. How many cubic yards of sandy loam soil must be
purchased (find the volume of a rectangular object)?. Answer: 208.3 cubic
yards
▶ What would be the volume of a 5-foot-diameter pump tank that is 5 feet
tall with the inlet 1 foot below the rim?. Answer: 587 gals
▶ What would be the percent slope on a lot 250 feet deep that drops 20
feet in elevation over the depth of the lot?. Answer: 8%
