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OSSF DR TEST PRACTICE QUESTIONS WITH CORRECT ANSWERS
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OSSF DR TEST PRACTICEQUESTIONS WITH CORRECT
ANSWERS
_______ and ________ soil textural classifications are always unsuitable for
standard absorptive OSSF (ANSWER class IA and IV).
Identify each of the major soil horizons: surface soil A, surface soil B, and
parent material.
The term _____________ refers to water's ability to travel across a soil profile
under either _________ or __________ conditions. - ANSWER: hydraulic
conductivity, saturated, unsaturated.
The interconnected pores in the soil profile allow air and water to enter the soil
at its surface and travel below.
List the four components of soil: air, water, organics, and inorganics.
A drainfield measures 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 should be
purchased (calculate the volume of a rectangular item). ANSWER: 208.3 cubic
yards.
What is the volume of a 5-foot-diameter pump tank that stands 5 feet tall, with
the inlet 1 foot below the rim? - ANSWER: 587 gals
What is the per cent slope of a 250-foot-deep lot with a 20-foot elevation
decline over its depth? - ANSWER 8%
How many cubic yards of gravel would it take to fill a ditch 3 feet deep, 10 feet
wide, and 12 feet long with 18 inches of gravel? 1 cubic yard is 27 cubic feet. -
Answer: 6.67 cubic yards.
,A septic tank is six feet in diameter and eight feet deep. How many gallons can
it hold if the overflow line is halfway up from the bottom? - ANSWER: 846
girls
Find the operating liquid capacity (volume) for this septic tank. SEE PAGE 2–
39!! - ANSWER: 1077gals
What is the surface area (square feet) of an evapotranspiration system 40 feet
wide by 65 feet long? - ANSWER: 2,600 sqft
Calculate the acreage for a property with 256 feet on each of four corners. -
ANSWER: 1.5 acres
The area of a lot measuring 60ft by 280ft is 16,800 sqft, or 0.39 acres.
A ________ is a possible disposal solution for clay soil. - ANSWER drip or
spray irrigation.
The principal treatment equipment that provides the least or poorest treatment
for household wastewater is _______. - ANSWER Septic Tank
Nitrogen or nitrate removal in soil is accomplished by ________. - ANSWER:
vegetation uptake.
The parameters impacting bacterial survivability in soil are _______. -
ANSWER: moisture, temperature, pH, and organic stuff.
Bacterial elimination by straining happens when _______. - ANSWER:
Bacteria are larger than soil pore holes.
A substance that can be filtered out of wastewater is called a _________. -
Answer: suspended solid.
, Which of the following explains how domestic wastewater departs a home? -
ANSWER: fresh, bright in hue, contains dissolved oxygen
Which of the following issues are caused by failing septic tank systems? -
ANSWER surface water pollution, groundwater contamination, and standing
sewage in communities
ANSWER: Nitrate is an inorganic substance that impacts human health.
The parasites (helminths) present in untreated sewage include ________. -
Answer: hookworms, roundworms, and tapeworms.
Viruses cause diseases such as poliomyelitis and viral hepatitis.
The type of bacteria that indicates sewage contamination is ________. -
ANSWER: Fecal Coliform
Protozoa are extremely basic animal creatures that can cause _______. -
Answer: amoeba dysentery and giardiasis.
Waterborne infections caused by harmful bacteria include _________. -
Answer: typhoid, cholera, and dysentery.
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