CO Wastewater Systems Contractor
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A Colorado wastewater systems contractor is preparing to install an
onsite wastewater treatment system (OWTS) for a residential
property. Which factor is most fundamental when determining
whether the proposed system can be appropriately designed for the
site?
A. The preferred manufacturer of the treatment tank
B. The soil characteristics, site conditions, wastewater flow, and applicable
requirements
C. The color and finish of the distribution piping
D. The distance between the residence and the nearest electrical panel
B. The soil characteristics, site conditions, wastewater flow, and
applicable requirements
The suitability of an OWTS depends on site-specific conditions, including
soil characteristics, available treatment and dispersal area, wastewater
loading, groundwater conditions, topography, and applicable regulatory
requirements.
, 2. In an OWTS, the primary purpose of a septic tank is to perform
which function?
A. Completely disinfect wastewater before discharge
B. Remove settleable solids and allow anaerobic treatment of wastewater
C. Pump effluent directly into the soil without treatment
D. Aerate wastewater continuously with mechanical equipment
B. Remove settleable solids and allow anaerobic treatment of
wastewater
A septic tank provides primary treatment by allowing heavier solids to
settle as sludge, lighter materials to float as scum, and wastewater to
undergo biological treatment before effluent proceeds to further
treatment or dispersal.
3. Why is hydraulic loading an important consideration when designing
a wastewater dispersal system?
A. Excessive hydraulic loading can overload the treatment and soil
dispersal components
B. Hydraulic loading determines the color of the septic tank
C. Hydraulic loading eliminates the need for soil evaluation
D. Hydraulic loading is unrelated to wastewater system performance
A. Excessive hydraulic loading can overload the treatment and soil
dispersal components
,The system must be sized to accommodate expected wastewater flow
without causing hydraulic failure, ponding, surfacing, inadequate
treatment, or premature soil clogging.
4. Which condition most strongly indicates that an OWTS site may
have inadequate soil-based dispersal capability?
A. Deep, suitable unsaturated soil with adequate separation from
groundwater
B. Appropriate soil texture and structure throughout the proposed
dispersal area
C. Shallow restrictive layers or groundwater that limit effective treatment
depth
D. A properly graded access road
C. Shallow restrictive layers or groundwater that limit effective
treatment depth
Restrictive layers, shallow bedrock, seasonal groundwater, or other
limiting conditions can reduce the soil's ability to provide adequate
treatment and hydraulic dispersal.
5. What is the primary purpose of maintaining adequate separation
between a soil treatment area and groundwater?
A. To prevent groundwater from entering the residence
B. To provide sufficient unsaturated soil for wastewater treatment and
protect groundwater quality
, C. To increase the operating pressure of the septic tank
D. To reduce the amount of household wastewater generated
B. To provide sufficient unsaturated soil for wastewater treatment and
protect groundwater quality
Unsaturated soil provides important physical, chemical, and biological
treatment processes and helps prevent inadequately treated
wastewater from reaching groundwater.
6. During excavation for a soil treatment area, the contractor discovers
groundwater at a shallower elevation than anticipated. What should
the contractor do first?
A. Continue installation and cover the groundwater with additional soil
B. Ignore the finding if the septic tank has already been delivered
C. Stop and evaluate the condition against the approved design and
applicable requirements
D. Increase the number of bedrooms in the design
C. Stop and evaluate the condition against the approved design and
applicable requirements
Unexpected groundwater can materially affect system suitability and
required separation distances, so construction should not proceed
without determining whether the approved design remains valid.
7. What is the principal function of an effluent filter installed at a
septic tank outlet?
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A Colorado wastewater systems contractor is preparing to install an
onsite wastewater treatment system (OWTS) for a residential
property. Which factor is most fundamental when determining
whether the proposed system can be appropriately designed for the
site?
A. The preferred manufacturer of the treatment tank
B. The soil characteristics, site conditions, wastewater flow, and applicable
requirements
C. The color and finish of the distribution piping
D. The distance between the residence and the nearest electrical panel
B. The soil characteristics, site conditions, wastewater flow, and
applicable requirements
The suitability of an OWTS depends on site-specific conditions, including
soil characteristics, available treatment and dispersal area, wastewater
loading, groundwater conditions, topography, and applicable regulatory
requirements.
, 2. In an OWTS, the primary purpose of a septic tank is to perform
which function?
A. Completely disinfect wastewater before discharge
B. Remove settleable solids and allow anaerobic treatment of wastewater
C. Pump effluent directly into the soil without treatment
D. Aerate wastewater continuously with mechanical equipment
B. Remove settleable solids and allow anaerobic treatment of
wastewater
A septic tank provides primary treatment by allowing heavier solids to
settle as sludge, lighter materials to float as scum, and wastewater to
undergo biological treatment before effluent proceeds to further
treatment or dispersal.
3. Why is hydraulic loading an important consideration when designing
a wastewater dispersal system?
A. Excessive hydraulic loading can overload the treatment and soil
dispersal components
B. Hydraulic loading determines the color of the septic tank
C. Hydraulic loading eliminates the need for soil evaluation
D. Hydraulic loading is unrelated to wastewater system performance
A. Excessive hydraulic loading can overload the treatment and soil
dispersal components
,The system must be sized to accommodate expected wastewater flow
without causing hydraulic failure, ponding, surfacing, inadequate
treatment, or premature soil clogging.
4. Which condition most strongly indicates that an OWTS site may
have inadequate soil-based dispersal capability?
A. Deep, suitable unsaturated soil with adequate separation from
groundwater
B. Appropriate soil texture and structure throughout the proposed
dispersal area
C. Shallow restrictive layers or groundwater that limit effective treatment
depth
D. A properly graded access road
C. Shallow restrictive layers or groundwater that limit effective
treatment depth
Restrictive layers, shallow bedrock, seasonal groundwater, or other
limiting conditions can reduce the soil's ability to provide adequate
treatment and hydraulic dispersal.
5. What is the primary purpose of maintaining adequate separation
between a soil treatment area and groundwater?
A. To prevent groundwater from entering the residence
B. To provide sufficient unsaturated soil for wastewater treatment and
protect groundwater quality
, C. To increase the operating pressure of the septic tank
D. To reduce the amount of household wastewater generated
B. To provide sufficient unsaturated soil for wastewater treatment and
protect groundwater quality
Unsaturated soil provides important physical, chemical, and biological
treatment processes and helps prevent inadequately treated
wastewater from reaching groundwater.
6. During excavation for a soil treatment area, the contractor discovers
groundwater at a shallower elevation than anticipated. What should
the contractor do first?
A. Continue installation and cover the groundwater with additional soil
B. Ignore the finding if the septic tank has already been delivered
C. Stop and evaluate the condition against the approved design and
applicable requirements
D. Increase the number of bedrooms in the design
C. Stop and evaluate the condition against the approved design and
applicable requirements
Unexpected groundwater can materially affect system suitability and
required separation distances, so construction should not proceed
without determining whether the approved design remains valid.
7. What is the principal function of an effluent filter installed at a
septic tank outlet?
