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Exam (elaborations)

OSSF DR Test Practice 2025/2026 | Complete Practice Questions, Sample Exams & Verified Answers

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OSSF DR Test Practice 2025/2026 | Complete Practice Questions, Sample Exams & Verified Answers

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OSSF
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Institution
OSSF
Course
OSSF

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Uploaded on
December 31, 2025
Number of pages
21
Written in
2025/2026
Type
Exam (elaborations)
Contains
Questions & answers

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Terms in this set (150)


TCEQ
_______ adopted the current OSSF Rules
in 1997 and revised them several times


utilize aerobic bacteria and oxygen to break down complex organics and produce
Aerobic treatment units carbon dioxide

sequence, depth, top, bottom
The ___________ and ____________ of
each soil horizon should be measured
from ________ to _________ and
recorded in the soil evaluation report.

class IA and IV
_______ and ________ soil textural
classes are always unsuitable for standard
absorptive OSSF

24, unsuitable
Any soil profile with an indication of
high-water table within _____ inches
below the proposed drainfield shall be
considered _____________ for a standard
drainfield.


0.46 acres
The area of a lot is 20,076 square feet.
What is the area of this lot in acres?

, oils, greases, and fats
Blockage in the home plumbing system is
often caused by _______, ________, and
_________.

1077gals
Calculate the working liquid capacity
(volume) for this septic tank. SEE PAGE
2-39!!

sandy loam, loam
Class II soils include the USDA classes of
_________ and __________.

hydraulic overloading (due to modernized tank usually)
A common reason for wastewater system
failure is __________.

soil survey
The county ____________________ is an
essential tool for conducting a site
evaluation but does not take the place of
the on-site field soil evaluation.


24
The depth of soil classified as suitable
with respect to texture shall be at least
____ inches below the bottom of the
proposed excavation for a standard
drainfield.


drip or spray irrigation
A disposal option that might be
considered in a clay soil would be a
________.

, infectious diseases
Domestic wastewater contains
microorganisms that are capable of
causing _________.

208.3 cubic yards

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)?


be equipped with mechanisms to flush from the drainfield back to the treatment
A drip irrigation system must unit or pump tank

suspended solids
Drip irrigation systems are most sensitive
to which type of contaminant?


300
The expected volume of wastewater (Q)
in gal/day from an older (pre-1990) three-
bedroom mobile home would be


moisture, temperature, pH, and organic matter.
The factors influencing the survival of
bacteria in soil are _______.

1.5 acres
Figure the acreage for a piece of property
that measures 256 feet on each of four
sides.

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