New Hampshire Septic Installer Exam 3 |
Exam Questions and Correct Answers with
Rationales | Site Conditions, Setbacks, EDAs
and Troubleshooting
NEW HAMPSHIRE SEPTIC INSTALLER EXAM 3
Exam Questions and Correct Answers with Rationales | Site Conditions,
Setbacks, EDAs and Troubleshooting
DOCUMENT OVERVIEW
• Comprehensive practice exam containing 200 multiple-choice questions designed
to thoroughly test knowledge of New Hampshire septic system installation
standards, site evaluation, regulatory setbacks, environmental design areas, and
field troubleshooting scenarios.
• Use this material to systematically review all critical topics covered in the New
Hampshire septic installer certification curriculum; work through questions by topic
area and focus additional study time on sections where you score below 80%
accuracy.
SECTION 1: SITE CONDITIONS (Questions 1-50)
1. When evaluating site conditions for a septic system, which of the following
factors is NOT considered part of the initial site assessment?
A) Soil texture and composition
B) Groundwater depth and seasonal fluctuations
C) Surface water features and drainage patterns
D) The color of the house exterior
E) Slope and topography of the property
CORRECT ANSWER: D) The color of the house exterior is not a relevant factor
in site condition assessment.
,Rationale: Site condition evaluation requires assessment of soil properties,
groundwater conditions, surface water, slope, and topography—all factors that
affect septic system performance and longevity. The color of the house exterior has
no bearing on septic system suitability and is not part of any technical site
assessment standard in New Hampshire regulations.
2. What is the maximum slope percentage for a septic system installation site
in New Hampshire?
A) 2%
B) 5%
C) 15%
D) 25%
E) 35%
CORRECT ANSWER: C) 15% is the maximum slope percentage for septic system
installation sites in New Hampshire.
Rationale: New Hampshire Department of Environmental Services regulations
specify that septic systems should be installed on sites with slopes not exceeding
15%. Slopes greater than 15% present challenges for proper system installation,
maintenance access, and prevent adequate percolation and treatment of
wastewater.
3. When performing a percolation test, what is the standard soil depth at
which the test must be conducted?
A) 6 inches below ground surface
B) 12 inches below ground surface
C) 18 inches below ground surface
D) 24 inches below ground surface
,E) 36 inches below ground surface
CORRECT ANSWER: D) 24 inches below ground surface is the standard depth
for conducting percolation tests.
Rationale: New Hampshire regulations require percolation tests to be performed at
a depth of 24 inches below the proposed ground surface. This depth represents the
typical location where the soil absorption system will function and provides the
most accurate assessment of percolation rates at the level where wastewater
treatment occurs.
4. What soil texture generally provides the best percolation rate for septic
system absorption fields?
A) Clay
B) Sandy loam
C) Heavy clay
D) Silt
E) Pure sand
CORRECT ANSWER: B) Sandy loam provides optimal percolation rates for
septic system absorption fields.
Rationale: Sandy loam soils typically have percolation rates between 1-3 inches per
hour, which is ideal for septic absorption fields. This texture allows for adequate
drainage while retaining sufficient soil structure for proper contaminant filtration.
Pure sand (E) drains too quickly, while clay soils (A, C) drain too slowly.
5. How often should soil boring logs be taken across a proposed septic system
site?
A) One boring at the proposed tank location
B) One boring every 1,000 square feet
, C) One boring every 500 square feet
D) One boring for every 5,000 square feet
E) Continuous boring across the entire site
CORRECT ANSWER: B) One boring every 1,000 square feet is the standard
requirement.
Rationale: New Hampshire DES guidelines recommend soil borings at intervals of
approximately one boring per 1,000 square feet to adequately characterize site soil
conditions. This frequency ensures that soil variability across the site is properly
documented and that the design accounts for areas of poorest percolation.
6. Which of the following subsurface conditions would require a mounding
system?
A) Seasonally high groundwater table
B) Soil with percolation rate of 2 inches per hour
C) Loamy sand with good drainage
D) Site with gentle slope
E) Area with deep water table
CORRECT ANSWER: A) Seasonally high groundwater table necessitates a
mounding system.
Rationale: Mounding systems are required when the water table is shallow or
seasonally high, typically less than 4 feet below the proposed absorption field. A
mound raises the soil absorption system above the natural grade to create
adequate separation from groundwater. This is a critical design modification to
protect groundwater quality.
7. What is the minimum separation distance required between a septic
absorption field and groundwater in New Hampshire?
Exam Questions and Correct Answers with
Rationales | Site Conditions, Setbacks, EDAs
and Troubleshooting
NEW HAMPSHIRE SEPTIC INSTALLER EXAM 3
Exam Questions and Correct Answers with Rationales | Site Conditions,
Setbacks, EDAs and Troubleshooting
DOCUMENT OVERVIEW
• Comprehensive practice exam containing 200 multiple-choice questions designed
to thoroughly test knowledge of New Hampshire septic system installation
standards, site evaluation, regulatory setbacks, environmental design areas, and
field troubleshooting scenarios.
• Use this material to systematically review all critical topics covered in the New
Hampshire septic installer certification curriculum; work through questions by topic
area and focus additional study time on sections where you score below 80%
accuracy.
SECTION 1: SITE CONDITIONS (Questions 1-50)
1. When evaluating site conditions for a septic system, which of the following
factors is NOT considered part of the initial site assessment?
A) Soil texture and composition
B) Groundwater depth and seasonal fluctuations
C) Surface water features and drainage patterns
D) The color of the house exterior
E) Slope and topography of the property
CORRECT ANSWER: D) The color of the house exterior is not a relevant factor
in site condition assessment.
,Rationale: Site condition evaluation requires assessment of soil properties,
groundwater conditions, surface water, slope, and topography—all factors that
affect septic system performance and longevity. The color of the house exterior has
no bearing on septic system suitability and is not part of any technical site
assessment standard in New Hampshire regulations.
2. What is the maximum slope percentage for a septic system installation site
in New Hampshire?
A) 2%
B) 5%
C) 15%
D) 25%
E) 35%
CORRECT ANSWER: C) 15% is the maximum slope percentage for septic system
installation sites in New Hampshire.
Rationale: New Hampshire Department of Environmental Services regulations
specify that septic systems should be installed on sites with slopes not exceeding
15%. Slopes greater than 15% present challenges for proper system installation,
maintenance access, and prevent adequate percolation and treatment of
wastewater.
3. When performing a percolation test, what is the standard soil depth at
which the test must be conducted?
A) 6 inches below ground surface
B) 12 inches below ground surface
C) 18 inches below ground surface
D) 24 inches below ground surface
,E) 36 inches below ground surface
CORRECT ANSWER: D) 24 inches below ground surface is the standard depth
for conducting percolation tests.
Rationale: New Hampshire regulations require percolation tests to be performed at
a depth of 24 inches below the proposed ground surface. This depth represents the
typical location where the soil absorption system will function and provides the
most accurate assessment of percolation rates at the level where wastewater
treatment occurs.
4. What soil texture generally provides the best percolation rate for septic
system absorption fields?
A) Clay
B) Sandy loam
C) Heavy clay
D) Silt
E) Pure sand
CORRECT ANSWER: B) Sandy loam provides optimal percolation rates for
septic system absorption fields.
Rationale: Sandy loam soils typically have percolation rates between 1-3 inches per
hour, which is ideal for septic absorption fields. This texture allows for adequate
drainage while retaining sufficient soil structure for proper contaminant filtration.
Pure sand (E) drains too quickly, while clay soils (A, C) drain too slowly.
5. How often should soil boring logs be taken across a proposed septic system
site?
A) One boring at the proposed tank location
B) One boring every 1,000 square feet
, C) One boring every 500 square feet
D) One boring for every 5,000 square feet
E) Continuous boring across the entire site
CORRECT ANSWER: B) One boring every 1,000 square feet is the standard
requirement.
Rationale: New Hampshire DES guidelines recommend soil borings at intervals of
approximately one boring per 1,000 square feet to adequately characterize site soil
conditions. This frequency ensures that soil variability across the site is properly
documented and that the design accounts for areas of poorest percolation.
6. Which of the following subsurface conditions would require a mounding
system?
A) Seasonally high groundwater table
B) Soil with percolation rate of 2 inches per hour
C) Loamy sand with good drainage
D) Site with gentle slope
E) Area with deep water table
CORRECT ANSWER: A) Seasonally high groundwater table necessitates a
mounding system.
Rationale: Mounding systems are required when the water table is shallow or
seasonally high, typically less than 4 feet below the proposed absorption field. A
mound raises the soil absorption system above the natural grade to create
adequate separation from groundwater. This is a critical design modification to
protect groundwater quality.
7. What is the minimum separation distance required between a septic
absorption field and groundwater in New Hampshire?
