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2024 OSSF DR TEST PRACTICE EXAM WITH CORRECT ANSWERS
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2024 OSSF DR TEST PRACTICE EXAM WITH CORRECT ANSWERS
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2024 OSSF DR TEST PRACTICEEXAM WITH CORRECT ANSWERS
Systems that routinely require a pump tank include - CORRECT-
ANSWERSsurface and drip irrigation and sand filters
The setback from a public water well for an aerobic plant is - CORRECT-
ANSWERS50 feet
A maintenance provider for a surface application OSSF using a proprietary
aerobic plant must have an employee who is - CORRECT-ANSWERSa licensed
maintenance provider or a registered maintenance technician
OSSF disposal systems that are routinely required to have maintenance
contracts are - CORRECT-ANSWERSsurface and subsurface drip irrigation
What is the purpose of requiring an affidavit to be filed with the county real
property records for a surface application system? - CORRECT-ANSWERSto
notify future property owners of the type of OSSF used and the maintenance
requirements
When a maintenance contract is required for a single-family residence OSSF,
the minimum frequency of site visits and type of testing is - CORRECT-
ANSWERSonce every four months with chlorine residual or fecal coliform
testing
Required samples for testing from a surface application system are collected
from - CORRECT-ANSWERSthe pump tank effluent line port
An LPD system for a new three-bedroom home with 2200 Sq ft (having
water-saving devices) with 9-inch-wide trenches with 1 foot of gravel depth
installed in Class III soil would require __________ linear feet of dosing pipe. -
CORRECT-ANSWERS400
An important part of the installation of an LPD system is - CORRECT-
ANSWERSchecking and adjusting pressure on lines
Drip irrigation systems are most sensitive to which type of contaminant? -
CORRECT-ANSWERSsuspended solids
, A drip irrigation system must - CORRECT-ANSWERSbe equipped with
mechanisms to flush from the drainfield back to the treatment unit or pump
tank
A mound or soil substitution drainfield is often used - CORRECT-
ANSWERSwhen existing soils will not provide adequate treatment due to
depth or texture
How many cubic yards of ASTMC-33 sand media must be purchased for an
intermittent sand filter treating wastewater from a new four bedroom home
(with water-saving devices) in order to meet minimum state requirements? -
CORRECT-ANSWERS18.5
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - CORRECT-ANSWERSclass IA and IV
List each of the major soil horizons - CORRECT-ANSWERSsurface 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. - CORRECT-
ANSWERSHydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the
soil at its surface and migrate downward - CORRECT-ANSWERSair, water
List the four components of soil - CORRECT-ANSWERSair, 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)? - CORRECT-
ANSWERS208.3 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? - CORRECT-ANSWERS587 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? - CORRECT-ANSWERS8%
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. - CORRECT-ANSWERS6.67 cubic yards
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