DESIGNATED REPRESENTATIVE OSSF
Exam Questions And 100% Verified
Answers| Latest 2026/ 2027 Update|
Graded A+
The majority of aerobic systems utilize what method of disposal -
correct answer -surface application
The complete system check of an aerobic unit includes - correct answer
--the compressor
-checking warning lights, audible alarms, motor malfunction
-rotten egg odor
-filters associated with compressor
Surface application systems and secondary treatment systems must be
tested at what frequency - correct answer -4 months
,Site visits/tests may be reduced to twice a year if - correct answer -
systems have electronic monitoring and automatic telephone or radio
access
Tests to be performed for all surface application systems include -
correct answer -Total Chlorine Residual or Fecal Coliform, minimum
chlorine residual .1mg/L, maximum fecal coliform 200mpn/100mL
Commercial and institutional facilities are required to have an annual
grab sample analyzed for - correct answer -BOD and TSS, both cannot
exceed 65mg/L
A testing and reporting form must be filled out with each visit and a
copy submitted to the regulatory authority within - correct answer -10
days
30 Minute settling test - correct answer -sludge volume should read
between 20% and 60% on a well-operating aeration plant. Should be
composed of brown, clumpy flock that settles gently
,If the sludge volume approaches 70% - correct answer -waste sludge
but do not pump dry in aerobic system, leave 15% in 30 minute settling
test
Sand Filtration - correct answer -A secondary treatment unit, used
when conditions exist that restrict soil absorption
Intermittent Sand Filtration - correct answer -Involves a single pass of
effluent through filter media and reduces BOD to 2-23mg/L and TSS to
3-13mg/L
Recirculating Sand Filtration - correct answer -return 50-75% of treated
effluent back to primary treatment tank. Lowers BOD by 98% and TSS
by 90%. Also reduces nitrate by 60%
Construction requirements for Sand systems - correct answer -primary
treatment septic tank, pump tank, high-water alarms, floats, controls,
sand media, filter bed containment, underdrains
, Pump tank sizing - correct answer -Should be sized for 1/3 day of flow
above the alarm "on" level. may be reduced to 4 hours when pump tank
is equipped with multiple pumps
Multiple pumps are required when - correct answer -Q is greater than
1000 GPD
Filter bed containment requirements - correct answer --liners of rubber
or plastic of at least 20mm cushioned with 4" of sand
-1' of concrete, gunite, compacted clay
-permeability of 10^-7 cm/sec or less
Filter bed construction - correct answer --underdrains laid no more than
1/8" fall per foot
-one line for no less than 1 foot
-min 6" covering of 3/4" washed gravel
-min 3" covering of 3/8" washed pea gravel
Exam Questions And 100% Verified
Answers| Latest 2026/ 2027 Update|
Graded A+
The majority of aerobic systems utilize what method of disposal -
correct answer -surface application
The complete system check of an aerobic unit includes - correct answer
--the compressor
-checking warning lights, audible alarms, motor malfunction
-rotten egg odor
-filters associated with compressor
Surface application systems and secondary treatment systems must be
tested at what frequency - correct answer -4 months
,Site visits/tests may be reduced to twice a year if - correct answer -
systems have electronic monitoring and automatic telephone or radio
access
Tests to be performed for all surface application systems include -
correct answer -Total Chlorine Residual or Fecal Coliform, minimum
chlorine residual .1mg/L, maximum fecal coliform 200mpn/100mL
Commercial and institutional facilities are required to have an annual
grab sample analyzed for - correct answer -BOD and TSS, both cannot
exceed 65mg/L
A testing and reporting form must be filled out with each visit and a
copy submitted to the regulatory authority within - correct answer -10
days
30 Minute settling test - correct answer -sludge volume should read
between 20% and 60% on a well-operating aeration plant. Should be
composed of brown, clumpy flock that settles gently
,If the sludge volume approaches 70% - correct answer -waste sludge
but do not pump dry in aerobic system, leave 15% in 30 minute settling
test
Sand Filtration - correct answer -A secondary treatment unit, used
when conditions exist that restrict soil absorption
Intermittent Sand Filtration - correct answer -Involves a single pass of
effluent through filter media and reduces BOD to 2-23mg/L and TSS to
3-13mg/L
Recirculating Sand Filtration - correct answer -return 50-75% of treated
effluent back to primary treatment tank. Lowers BOD by 98% and TSS
by 90%. Also reduces nitrate by 60%
Construction requirements for Sand systems - correct answer -primary
treatment septic tank, pump tank, high-water alarms, floats, controls,
sand media, filter bed containment, underdrains
, Pump tank sizing - correct answer -Should be sized for 1/3 day of flow
above the alarm "on" level. may be reduced to 4 hours when pump tank
is equipped with multiple pumps
Multiple pumps are required when - correct answer -Q is greater than
1000 GPD
Filter bed containment requirements - correct answer --liners of rubber
or plastic of at least 20mm cushioned with 4" of sand
-1' of concrete, gunite, compacted clay
-permeability of 10^-7 cm/sec or less
Filter bed construction - correct answer --underdrains laid no more than
1/8" fall per foot
-one line for no less than 1 foot
-min 6" covering of 3/4" washed gravel
-min 3" covering of 3/8" washed pea gravel
