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OSSF DR TEST PRACTICE QUESTIONS WITH ANSWERS.
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OSSF DR TEST PRACTICE QUESTIONSWITH ANSWERS.
_______ and ________ soil textural classes are always unsuitable for standard absorptive OSSF ANS -
class IA and IV
List each of the major soil horizons ANS -surface soil A, surface soil B, and parent material
_____________ is a term describing the ability of water to migrate through a soil profile under either
_________ or __________ conditions. ANS -Hydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the soil at its surface and
migrate downward ANS -air, water
List the four components of soil ANS -air, water, organics, inorganics
A drainfield is 50 feet by 90 feet and must be covered with an average of 15 inches of sand loam. How
many cubic yards of sandy loam soil must be purchased (find the volume of a rectangular object)? ANS -
208.3 cubic yards
What would be the volume of a 5-foot-diameter pump tank that is 5 feet tall with the inlet 1 foot below
the rim? ANS -587 gals
What would be the percent slope on a lot 250 feet deep that drops 20 feet in elevation over the depth
of the lot? ANS -8%
How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10 feet wide, and 12 feet
long with 18 inches of gravel? 1 cubic yard = 27 cubic feet. ANS -6.67 cubic yards
, A septic tank is 6 feet in diameter and is 8 feet deep. How many gallons will it hold if the overflow line is
located half way up from the bottom? ANS -846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE 2-39!! ANS -1077gals
What is the surface area (area in square feet) of an evapotranspiration system 40 feet wide and 65 feet
long? ANS -2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of four sides. ANS -1.5 acres
Figure the area of a lot that measures 60ft by 280ft ANS -16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a ________. ANS -drip or spray
irrigation
The primary treatment device providing the least or poorest treatment of domestic wastewater would
be _______. ANS -septic tank
Nitrogen or nitrate removal in soil occurs by _________. ANS -vegetation uptake
The factors influencing the survival of bacteria in soil are _______. ANS -moisture, temperature, pH, and
organic matter.
Physical removal of bacteria by straining occurs when _______. ANS -the bacteria are larger than the
pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. ANS -suspended solid
Which of the following describes domestic wastewater as it leaves a home? ANS -fresh, light in color,
has dissolved oxygen
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