GEOG 1400 PRACTICE TEST 2026 QUESTIONS
WITH ANSWERS GRADED A+
▶ T/F: A leakage from the tank or joints of 1.6 gallons/hour is permissible?
Answer:F
▶ T/F: A 12-inch port (minimum) must be provided in the top of the tank?
Answer:T
▶ T/F: The first compartment should be smaller than the second
compartment? Answer:F....Should be 1/2 to 2/3s the second
▶ T/F: Outlet Tee should extend to the bottom of the tank? Answer:F
▶ T/F: The tank must be level? Answer:T
▶ T/F: A minimum 4-inch-thick sand, sandy loam, clay loam, or pea gravel
pad is required under prefabricated tanks? Answer:T
▶ The standard drainfield depth in East and Central Texas is limited to?
Answer:18 inches minimum and 36 inches maximum
▶ The minimum distance between standard drainfield excavations is?
Answer:3 feet
▶ Grease interceptors are needed? Answer:on wastewater lines from
commercial kitchens
▶ 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
WITH ANSWERS GRADED A+
▶ T/F: A leakage from the tank or joints of 1.6 gallons/hour is permissible?
Answer:F
▶ T/F: A 12-inch port (minimum) must be provided in the top of the tank?
Answer:T
▶ T/F: The first compartment should be smaller than the second
compartment? Answer:F....Should be 1/2 to 2/3s the second
▶ T/F: Outlet Tee should extend to the bottom of the tank? Answer:F
▶ T/F: The tank must be level? Answer:T
▶ T/F: A minimum 4-inch-thick sand, sandy loam, clay loam, or pea gravel
pad is required under prefabricated tanks? Answer:T
▶ The standard drainfield depth in East and Central Texas is limited to?
Answer:18 inches minimum and 36 inches maximum
▶ The minimum distance between standard drainfield excavations is?
Answer:3 feet
▶ Grease interceptors are needed? Answer:on wastewater lines from
commercial kitchens
▶ 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
