OSSF DR TEST PRACTICE NEWEST EXAM
WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS| BRAND
NEW VERSION
To determine the minimum size of aerobic treatment unit needed for a particular
home, one must know - CORRECT 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? - CORRECT 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? - CORRECT ANSWER ✔✔- 30-minute
settling test
Which of the following is true of standard intermittent sand filter? - CORRECT
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? - CORRECT ANSWER ✔✔-
For a standard drainfield in class Ia soil
Pg. 1
,Trickling filters and wetlands - CORRECT ANSWER ✔✔- are secondary treatment
processes
Which of the following considerations should receive the greatest emphasis in
selecting a type of OSSF disposal option? - CORRECT ANSWER ✔✔- soil and site
conditions
On a West Texas site with 16 inches of Class Ia soil over fractured rock, suitable
OSSFs would include - CORRECT ANSWER ✔✔- lined ET or mound systems
What are the minimum soil requirements for leaching chambers or gravelless pipe
systems following a septic tank? - CORRECT 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 - CORRECT ANSWER ✔✔- at least
secondary treatment and disinfection
Surface application is often selected over other OSSF disposal options because of -
CORRECT 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? - CORRECT ANSWER ✔✔- Rate of irrigation (Ri) allowed in
that area and (Q) in gal/day
Systems that routinely require a pump tank include - CORRECT ANSWER ✔✔-
surface and drip irrigation and sand filters
Pg. 2
, The setback from a public water well for an aerobic plant is - CORRECT ANSWER
✔✔- 50 feet
A maintenance provider for a surface application OSSF using a proprietary aerobic
plant must have an employee who is - CORRECT ANSWER ✔✔- a licensed
maintenance provider or a registered maintenance technician
OSSF disposal systems that are routinely required to have maintenance contracts
are - CORRECT 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? - CORRECT 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 - CORRECT ANSWER ✔✔-
once every four months with chlorine residual or fecal coliform testing
Required samples for testing from a surface application system are collected from
- CORRECT 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. - CORRECT
ANSWER ✔✔- 400
Pg. 3
WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS| BRAND
NEW VERSION
To determine the minimum size of aerobic treatment unit needed for a particular
home, one must know - CORRECT 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? - CORRECT 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? - CORRECT ANSWER ✔✔- 30-minute
settling test
Which of the following is true of standard intermittent sand filter? - CORRECT
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? - CORRECT ANSWER ✔✔-
For a standard drainfield in class Ia soil
Pg. 1
,Trickling filters and wetlands - CORRECT ANSWER ✔✔- are secondary treatment
processes
Which of the following considerations should receive the greatest emphasis in
selecting a type of OSSF disposal option? - CORRECT ANSWER ✔✔- soil and site
conditions
On a West Texas site with 16 inches of Class Ia soil over fractured rock, suitable
OSSFs would include - CORRECT ANSWER ✔✔- lined ET or mound systems
What are the minimum soil requirements for leaching chambers or gravelless pipe
systems following a septic tank? - CORRECT 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 - CORRECT ANSWER ✔✔- at least
secondary treatment and disinfection
Surface application is often selected over other OSSF disposal options because of -
CORRECT 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? - CORRECT ANSWER ✔✔- Rate of irrigation (Ri) allowed in
that area and (Q) in gal/day
Systems that routinely require a pump tank include - CORRECT ANSWER ✔✔-
surface and drip irrigation and sand filters
Pg. 2
, The setback from a public water well for an aerobic plant is - CORRECT ANSWER
✔✔- 50 feet
A maintenance provider for a surface application OSSF using a proprietary aerobic
plant must have an employee who is - CORRECT ANSWER ✔✔- a licensed
maintenance provider or a registered maintenance technician
OSSF disposal systems that are routinely required to have maintenance contracts
are - CORRECT 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? - CORRECT 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 - CORRECT ANSWER ✔✔-
once every four months with chlorine residual or fecal coliform testing
Required samples for testing from a surface application system are collected from
- CORRECT 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. - CORRECT
ANSWER ✔✔- 400
Pg. 3
