DESIGNATED REPRESENTATIVE OSSF ACTUAL
EXAM SCRIPT 2026 QUESTIONS AND
ANSWERS 100% CORRECT
◉ Who can conduct a site evaluation. Answer: licensed site evaluation
licensed engineer
◉ what things that are evaluated for a site evaluation. Answer: soil
characteristics
topography
groundwater evaluation
flood hazards
setback distances
◉ what depth beneath the proposed drainfield must suitable soil extend
to. Answer: 24 inches
◉ what is an unsuitable slope?. Answer: greater than 30%
◉ what slope percentage would require modification?. Answer: less than
2%
,◉ if one or more soil or site criteria are unsuitable, can a standard
absorptive drainfield be used?. Answer: no
◉ effects of surface run off on treatment units. Answer: damage to
pumps
flooding of tanks
◉ effects of surface run off on disposal area. Answer: erosion of top soil
openings in soil cover
saturation of absorptive layers of the area
◉ what is the optimal slope for drainage. Answer: 2-6%
◉ is the shape, configuration, relief, 3D quality of earth's surface.
Answer: topography
◉ imaginary lines of constant elevation on surface of ground; connects
parts of equal elevation. Answer: contours
◉ contour lines that are tightly close together depict what type of slope.
Answer: steep slope
, ◉ contour lines that are widely spread depict what type of slope.
Answer: flat slope
◉ contour lines that are evenly spaced depict what type of slope.
Answer: constant uniform slope
◉ contour lines that are straight and parallel demonstrate what type of
slope. Answer: plane surface
◉ areas that can have overflow or be inundated with runoff from a river
of body of water. Answer: flood plain
◉ rate of rise or fall of the soil surface from the horizontal and is
expressed as a percentage. Answer: slope
◉ what is the maximum allowable slope for absorptive drainfield.
Answer: 30%
◉ is defined as the difference in elevation between 2 points. Answer:
rise
◉ defined as the distance between two points. Answer: run
EXAM SCRIPT 2026 QUESTIONS AND
ANSWERS 100% CORRECT
◉ Who can conduct a site evaluation. Answer: licensed site evaluation
licensed engineer
◉ what things that are evaluated for a site evaluation. Answer: soil
characteristics
topography
groundwater evaluation
flood hazards
setback distances
◉ what depth beneath the proposed drainfield must suitable soil extend
to. Answer: 24 inches
◉ what is an unsuitable slope?. Answer: greater than 30%
◉ what slope percentage would require modification?. Answer: less than
2%
,◉ if one or more soil or site criteria are unsuitable, can a standard
absorptive drainfield be used?. Answer: no
◉ effects of surface run off on treatment units. Answer: damage to
pumps
flooding of tanks
◉ effects of surface run off on disposal area. Answer: erosion of top soil
openings in soil cover
saturation of absorptive layers of the area
◉ what is the optimal slope for drainage. Answer: 2-6%
◉ is the shape, configuration, relief, 3D quality of earth's surface.
Answer: topography
◉ imaginary lines of constant elevation on surface of ground; connects
parts of equal elevation. Answer: contours
◉ contour lines that are tightly close together depict what type of slope.
Answer: steep slope
, ◉ contour lines that are widely spread depict what type of slope.
Answer: flat slope
◉ contour lines that are evenly spaced depict what type of slope.
Answer: constant uniform slope
◉ contour lines that are straight and parallel demonstrate what type of
slope. Answer: plane surface
◉ areas that can have overflow or be inundated with runoff from a river
of body of water. Answer: flood plain
◉ rate of rise or fall of the soil surface from the horizontal and is
expressed as a percentage. Answer: slope
◉ what is the maximum allowable slope for absorptive drainfield.
Answer: 30%
◉ is defined as the difference in elevation between 2 points. Answer:
rise
◉ defined as the distance between two points. Answer: run
