TEXAS ON-SITE SEWAGE FACILITY (OSSF)
INSTALLER II TEST 2026/2027 BANK EXAM
QUESTIONS ACCURATE ACTUAL EXAM /
FREQUENTLY TESTED QUESTIONS WITH
DETAILED ANSWERS | GUARANTEED PASS
| GRADED A | LATEST UPDATE
Which of the following considerations should receive the
greatest emphasis in selecting a type of OSSF system
disposal option ?
a . System cost
b. Electrical rates
c . Soil and site conditions
d . Maintenance and service availability - ....ANSWER...c
. Soil and site conditions
Which of the following is true of aerobic treatment plants
?
a . Able to maintain a minimum DO of 4.0 mg / L
b . Odor free , utilize aerobic bacteria and produce
hydrogen sulfide gas .
,c. Use aerobic bacteria and oxygen to breakdown complex
organics and produce carbon dioxide
d . Use aerobic bacteria and carbon dioxide to produce
complex organic compounds and natural gas -
....ANSWER...c . Use aerobic bacteria and oxygen to
breakdown complex organics and produce carbon dioxide
To determine if a proprietary aerobic treatment plant is
appropriate for use with surface application disposal it
must
a . be on the TCEQ's most recently approved list
b . be able to maintain a minimum DO of 4.0 mg / L
c . have a volume equal to three times the expected daily
flow
d . be certified by a PE or RS to provide 90 % or better
treatment - ....ANSWER...d . be certified by a PE or RS to
provide 90 % or better treatment
What would include On a west Texas site with 16 in of
Class Ia soil over fractured rock suitable OSSF systems a .
lined or unlined ETs
,b . lined ET or LPD systems
c . lined ET or mound systems
d . surface application or leaching chamber systems -
....ANSWER...c . lined ET or mound systems chamber
The minimum soil requirements for leaching chambers or
gravelless pipe systems following a septic tank are
A. 2 ft . of Class Ib , II , or III soil below the field bottom
B. the same as for a standard absorptive drainfield
C. 4 ft . of permeable soil with no more than seasonable
saturation
D. both a and b - ....ANSWER...D both a and b
OSSF surface application always requires
a . at least primary treatment and disinfection
b . at least secondary treatment and disinfection
c . primary treatment and disinfection or secondary
treatment atenti
d . tertiary treatment bvad - ....ANSWER...b . at least
secondary treatment and disinfection
, vision Why is surface application often selected over other
OSSF disposal options ?
a . Small lots diw it
b . The lake front setback for waterfront property assage
nonsollege
c . Clay soils and / or seasonal groundwater problems
d . The irrigation water available for vegetable gardens or
orchards - ....ANSWER...c . Clay soils and / or seasonal
groundwater problems
Which of the following is required to determine the size of
spray area required for an OSSF spray irrigation system ?
a . soil R , in gal./ft.2/day and Q in gal./min .
b . Q in gal./day and aerobic plant capacity to
c . rate of irrigation ( R ) allowed in that area and ( Q ) in
gal./day
D. maximum aerobic plant capacity and the soil
acceptance tance rate rate ( R₂ ) - ....ANSWER...c . rate of
irrigation ( R ) allowed in that area and ( Q ) in gal./day
Which systems routinely require a pump tank ?
a . LPD and leaching chambers
INSTALLER II TEST 2026/2027 BANK EXAM
QUESTIONS ACCURATE ACTUAL EXAM /
FREQUENTLY TESTED QUESTIONS WITH
DETAILED ANSWERS | GUARANTEED PASS
| GRADED A | LATEST UPDATE
Which of the following considerations should receive the
greatest emphasis in selecting a type of OSSF system
disposal option ?
a . System cost
b. Electrical rates
c . Soil and site conditions
d . Maintenance and service availability - ....ANSWER...c
. Soil and site conditions
Which of the following is true of aerobic treatment plants
?
a . Able to maintain a minimum DO of 4.0 mg / L
b . Odor free , utilize aerobic bacteria and produce
hydrogen sulfide gas .
,c. Use aerobic bacteria and oxygen to breakdown complex
organics and produce carbon dioxide
d . Use aerobic bacteria and carbon dioxide to produce
complex organic compounds and natural gas -
....ANSWER...c . Use aerobic bacteria and oxygen to
breakdown complex organics and produce carbon dioxide
To determine if a proprietary aerobic treatment plant is
appropriate for use with surface application disposal it
must
a . be on the TCEQ's most recently approved list
b . be able to maintain a minimum DO of 4.0 mg / L
c . have a volume equal to three times the expected daily
flow
d . be certified by a PE or RS to provide 90 % or better
treatment - ....ANSWER...d . be certified by a PE or RS to
provide 90 % or better treatment
What would include On a west Texas site with 16 in of
Class Ia soil over fractured rock suitable OSSF systems a .
lined or unlined ETs
,b . lined ET or LPD systems
c . lined ET or mound systems
d . surface application or leaching chamber systems -
....ANSWER...c . lined ET or mound systems chamber
The minimum soil requirements for leaching chambers or
gravelless pipe systems following a septic tank are
A. 2 ft . of Class Ib , II , or III soil below the field bottom
B. the same as for a standard absorptive drainfield
C. 4 ft . of permeable soil with no more than seasonable
saturation
D. both a and b - ....ANSWER...D both a and b
OSSF surface application always requires
a . at least primary treatment and disinfection
b . at least secondary treatment and disinfection
c . primary treatment and disinfection or secondary
treatment atenti
d . tertiary treatment bvad - ....ANSWER...b . at least
secondary treatment and disinfection
, vision Why is surface application often selected over other
OSSF disposal options ?
a . Small lots diw it
b . The lake front setback for waterfront property assage
nonsollege
c . Clay soils and / or seasonal groundwater problems
d . The irrigation water available for vegetable gardens or
orchards - ....ANSWER...c . Clay soils and / or seasonal
groundwater problems
Which of the following is required to determine the size of
spray area required for an OSSF spray irrigation system ?
a . soil R , in gal./ft.2/day and Q in gal./min .
b . Q in gal./day and aerobic plant capacity to
c . rate of irrigation ( R ) allowed in that area and ( Q ) in
gal./day
D. maximum aerobic plant capacity and the soil
acceptance tance rate rate ( R₂ ) - ....ANSWER...c . rate of
irrigation ( R ) allowed in that area and ( Q ) in gal./day
Which systems routinely require a pump tank ?
a . LPD and leaching chambers
