OSSF & TCEQ: Questions & Accurate Answers (Scored
A+)
Aerobic digestion Right Ans - bacterial decomposition and stabilization of
sewage in presence of free oxygen
Aerobic unit treatment size Right Ans - most residential aerobic systems
can treat 500 gallons/day
The 4 parts of an aerobic treatment unit Right Ans - 1. pretreatment tank
2. aeration chamber
3. settling chamber
4. final treatment and dispersal component
What is the most common wastewater treatment system in texas? Right
Ans - aerobic treatment unit
What is a clarifier Right Ans - it allows the cell mass and nondegradable
materials to settle from the water before it goes to treatment
Aerobic treatment unit Right Ans - greatly lowers the BOD and reduces the
suspended solids that do not settle at the bottom of the clarifier.
Alter system Right Ans - ILLEGAL WITHOUT PERMIT
includes: increasing volume of flow, change in type of waste, change in
construction or design
Anaerobic digestion Right Ans - bacterial decomposition and stabilization
of sewage in the absence of oxygen
most common method of anerobic digestion Right Ans - septic tank
borehole Right Ans - a drilled hole 4 feet or greater in depth and 1-3 feet in
diameter
cesspool Right Ans - non-watertight , covered receptacle intended for he
receipt and partial treatment of sewage. Has open-jointed sidewalls and
, bottom to allow gradual discharge of affluent while retaining solids for
anaerobic decomposition
cluster system Right Ans - sewage collection/treatment/disposal system
designed for 2+ units on separate legal tracts of land where total flow is less
than 5000 gallons/day
what type of ossf system is not authorized under 285 Right Ans - cluster
system. Old ones can be kept and maintained, but no new ones can be built
Condensate Drain Right Ans - pipe used for disposal of water generated by
AC units, fridges, etc. Creates extra volume requirement if attached to OSSF
Edwards aquifer recharge zone Right Ans - area where stratigraphic units
constituting edwards aquifer crop out and creates potential for recharge of
surface waters into the aquifer.
how large does a tract of land on the edwards aquifer recharge zone need to
be Right Ans - 1 acre
how big is an acre Right Ans - 43,560 square feet
how far does a sewage treatment tank or holding tank need to be from the
aquifer recharge zone Right Ans - 50 feet
how far does a soil absorption zone need to be from the aquifer recharge zone
Right Ans - 100 feet
floodplain Right Ans - any area susceptible to a flood from any source and
subject to the statistical 100-year flood
geotextile filter fabric Right Ans - non-woven fabric suitable for
wastewater applications
Gravel-less drain field pipe Right Ans - distributes wastewater into soil like
conventional systems, but it's surrounded by geotextile fabric instead of
gravel. can only be used where subsurface disposal is suitable
A+)
Aerobic digestion Right Ans - bacterial decomposition and stabilization of
sewage in presence of free oxygen
Aerobic unit treatment size Right Ans - most residential aerobic systems
can treat 500 gallons/day
The 4 parts of an aerobic treatment unit Right Ans - 1. pretreatment tank
2. aeration chamber
3. settling chamber
4. final treatment and dispersal component
What is the most common wastewater treatment system in texas? Right
Ans - aerobic treatment unit
What is a clarifier Right Ans - it allows the cell mass and nondegradable
materials to settle from the water before it goes to treatment
Aerobic treatment unit Right Ans - greatly lowers the BOD and reduces the
suspended solids that do not settle at the bottom of the clarifier.
Alter system Right Ans - ILLEGAL WITHOUT PERMIT
includes: increasing volume of flow, change in type of waste, change in
construction or design
Anaerobic digestion Right Ans - bacterial decomposition and stabilization
of sewage in the absence of oxygen
most common method of anerobic digestion Right Ans - septic tank
borehole Right Ans - a drilled hole 4 feet or greater in depth and 1-3 feet in
diameter
cesspool Right Ans - non-watertight , covered receptacle intended for he
receipt and partial treatment of sewage. Has open-jointed sidewalls and
, bottom to allow gradual discharge of affluent while retaining solids for
anaerobic decomposition
cluster system Right Ans - sewage collection/treatment/disposal system
designed for 2+ units on separate legal tracts of land where total flow is less
than 5000 gallons/day
what type of ossf system is not authorized under 285 Right Ans - cluster
system. Old ones can be kept and maintained, but no new ones can be built
Condensate Drain Right Ans - pipe used for disposal of water generated by
AC units, fridges, etc. Creates extra volume requirement if attached to OSSF
Edwards aquifer recharge zone Right Ans - area where stratigraphic units
constituting edwards aquifer crop out and creates potential for recharge of
surface waters into the aquifer.
how large does a tract of land on the edwards aquifer recharge zone need to
be Right Ans - 1 acre
how big is an acre Right Ans - 43,560 square feet
how far does a sewage treatment tank or holding tank need to be from the
aquifer recharge zone Right Ans - 50 feet
how far does a soil absorption zone need to be from the aquifer recharge zone
Right Ans - 100 feet
floodplain Right Ans - any area susceptible to a flood from any source and
subject to the statistical 100-year flood
geotextile filter fabric Right Ans - non-woven fabric suitable for
wastewater applications
Gravel-less drain field pipe Right Ans - distributes wastewater into soil like
conventional systems, but it's surrounded by geotextile fabric instead of
gravel. can only be used where subsurface disposal is suitable
