1|Page
OSSF INSTALLER 1 LICENSE ACTUAL EXAM NEWEST
2025 ACTUAL EXAM COMPLETE 200 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+|BRAND NEW!!
What types of criminal offenses are related to OSSF -
ANSWER-misdemeanor in accordance with Chap 7 Texas Water
Code and Chapter 12.23 of Texas Penal Code
Max allowable slope for less than 20 ft - ANSWER-Stable Rock
(Vertical)90*
Type A (3/4:1) 53*
Type B (1:1) 45*
Type C (1.5:1) 34*
What is not an effective way to warn traffic about construction -
ANSWER-Anything that doesn't catch attention, like
construction equipment. Must have movement by a person or
flashing lights
What are 4 safety concerns when channeling traffic thru a work
area - ANSWER-pre warn, sign properly, regulate speed, guide
properly
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What is the angle of repose - ANSWER-an angle closest to
perpendicular at which the soil remains at rest
how far ahead must someone call Texas One Call before digging
with mechanical equipment - ANSWER-2 working days
excluding weekend and holiday
Three types of infection risk - ANSWER-hep A, leptospirosis
and parasites
Dangers of confined space rescues - ANSWER-Almost 60% of
fatalities involved would be rescuers
Cubic feet to Cubic Yards - ANSWER-divide by 27
Gallons to Cubic Feet - ANSWER-divide by 7.48
Gallons per minute to Gallons per day - ANSWER-multiple by
1,440
Cubic Yards to Gallons - ANSWER-multiple by 202
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Capacity formula 4 sided objects - ANSWER-L x W x H x 7.48
gallon/ft cubed
Capacity in circular objects - ANSWER-Pi x R squared x 7.48
gallon/ft cubed
Liquid working capacity - ANSWER-volume up to outlet line
What are bacteria that can cause disease called - ANSWER-
pathogens
Microorganisms in wastewater include - ANSWER-bacteria,
viruses, protozoa and melminths
What is a solid that can be filtered from waste called -
ANSWER-TOS total suspended solids
What is a solid that cannot be filtered from wastewater called -
ANSWER-TDS total dissolved solids
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What is Biochemical Oxygen Demand (BOD) - ANSWER-
measure strength of wastewater in regard to organic loading
What is dissolved oxygen (DO) - ANSWER-free oxygen that
can become available to waste, is consumed in a short period of
time, measure of freshness
Temp up, DO down Temp down, DO up
What pH is typical for wastewater - ANSWER-6.5-8.0
How does nitrogen removal take place? - ANSWER-by
vegetative uptake and denitrification in slow rate systems
Anaerobic bacteria is NOT found in - ANSWER-activated
sludge
What is physical straining in relation to soil treatment -
ANSWER-bacteria are larger than soil pore opening, increased
efficiency
What is flow rate in relation to soil treatment - ANSWER-low
flow has better efficiency of virus removal
OSSF INSTALLER 1 LICENSE ACTUAL EXAM NEWEST
2025 ACTUAL EXAM COMPLETE 200 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+|BRAND NEW!!
What types of criminal offenses are related to OSSF -
ANSWER-misdemeanor in accordance with Chap 7 Texas Water
Code and Chapter 12.23 of Texas Penal Code
Max allowable slope for less than 20 ft - ANSWER-Stable Rock
(Vertical)90*
Type A (3/4:1) 53*
Type B (1:1) 45*
Type C (1.5:1) 34*
What is not an effective way to warn traffic about construction -
ANSWER-Anything that doesn't catch attention, like
construction equipment. Must have movement by a person or
flashing lights
What are 4 safety concerns when channeling traffic thru a work
area - ANSWER-pre warn, sign properly, regulate speed, guide
properly
,2|Page
What is the angle of repose - ANSWER-an angle closest to
perpendicular at which the soil remains at rest
how far ahead must someone call Texas One Call before digging
with mechanical equipment - ANSWER-2 working days
excluding weekend and holiday
Three types of infection risk - ANSWER-hep A, leptospirosis
and parasites
Dangers of confined space rescues - ANSWER-Almost 60% of
fatalities involved would be rescuers
Cubic feet to Cubic Yards - ANSWER-divide by 27
Gallons to Cubic Feet - ANSWER-divide by 7.48
Gallons per minute to Gallons per day - ANSWER-multiple by
1,440
Cubic Yards to Gallons - ANSWER-multiple by 202
,3|Page
Capacity formula 4 sided objects - ANSWER-L x W x H x 7.48
gallon/ft cubed
Capacity in circular objects - ANSWER-Pi x R squared x 7.48
gallon/ft cubed
Liquid working capacity - ANSWER-volume up to outlet line
What are bacteria that can cause disease called - ANSWER-
pathogens
Microorganisms in wastewater include - ANSWER-bacteria,
viruses, protozoa and melminths
What is a solid that can be filtered from waste called -
ANSWER-TOS total suspended solids
What is a solid that cannot be filtered from wastewater called -
ANSWER-TDS total dissolved solids
, 4|Page
What is Biochemical Oxygen Demand (BOD) - ANSWER-
measure strength of wastewater in regard to organic loading
What is dissolved oxygen (DO) - ANSWER-free oxygen that
can become available to waste, is consumed in a short period of
time, measure of freshness
Temp up, DO down Temp down, DO up
What pH is typical for wastewater - ANSWER-6.5-8.0
How does nitrogen removal take place? - ANSWER-by
vegetative uptake and denitrification in slow rate systems
Anaerobic bacteria is NOT found in - ANSWER-activated
sludge
What is physical straining in relation to soil treatment -
ANSWER-bacteria are larger than soil pore opening, increased
efficiency
What is flow rate in relation to soil treatment - ANSWER-low
flow has better efficiency of virus removal
