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OSSF INSTALLER 1 LICENCE EXAM 2025 WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS |FREQUENTLY TESTED QUESTIONS AND SOLUTIONS |ALREADY GRADED A+|BRAND NEW !!!|GUARANTEED PASS |LATEST UPDATE $22.49
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OSSF INSTALLER 1 LICENCE EXAM 2025 WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS |FREQUENTLY TESTED QUESTIONS AND SOLUTIONS |ALREADY GRADED A+|BRAND NEW !!!|GUARANTEED PASS |LATEST UPDATE

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OSSF INSTALLER 1 LICENCE EXAM 2025 WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS |FREQUENTLY TESTED QUESTIONS AND SOLUTIONS |ALREADY GRADED A+|BRAND NEW !!!|GUARANTEED PASS |LATEST UPDATE

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  • March 9, 2025
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • OSSF INSTALLER 1 LICENCE
  • OSSF INSTALLER 1 LICENCE
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OSSF INSTALLER 1 LICENCE EXAM 2025 WITH
ACTUAL CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTIONS |ALREADY GRADED
A+|BRAND NEW !!!|GUARANTEED PASS |LATEST
UPDATE




Gravel in soil for drainfield

less than 30% if gravel > 2mm or over 80% of gravel must be < 5mm

Can you have evidence of groundwater within 2 feet of excavation

No

What kind of flood hazard can you have for drainfield?

None

Mottles can help determine seasonally saturated soil

true

What is infiltration

the entry of water into soil

What is permeability

the ease at which liquid can move in soil, effected by properties of soil like aggregation of structural
units

What are the 3 properties to characterize soil

texture, drainage/groundwater presence and depth/ restrictive horizon

What 2 types of soil are unsuitable

Class 1a, sand with > 30% gravel and clay


1|Page

,Minimum lot size for OSSF

1 acre if private water supply
1/2 acre if on city water

Ideal topography for OSSF

nearly level with gentle slope for rainwater runoff

What % slope is unsuitable for OSSF

greater than 30%

Where should OSSF NOT be located in regards to topography

in a depression or in a complex slope area dissected by gullies and ravines

How can topography be measured

GPS, laser, optical instrument

What is the surface grade

the slope of a line expressed as a percent in feet or inches per 100 feet

Minimum distance for tank and distribution field

public water well 50/150 feet
public or private water line 10/10 feet
streams, ponds, etc 50/75 feet (except LDP is 25ft)
foundations 5/5 feet
easements 1 foot total
slope where seepage may occur 5/25 feet
Edwards aquifer 50/150 feet

Formula for calculating slope

difference in elevation over distance multiplied by 100
ex: high point 15 feet, distance 200 feet = 0.75 x 100= 7.5% slope

Formula for drop in inches of pipe, if grade is known

% slope/100 times distance
ex drop in inches of 0.33% grade over 150 feet
0.33/100 = .0033ft times 150 ft = 0.495 ft
0.495 ft x 12inches per foot = 5.9 inches

What should a lot design and installation evaluation include

lot size, soil and geologic conditions, topography and slope, setbacks, flood hazards

What is a common reason for soil absorption system failure

lot size too small

2|Page

, What is a serious threat when a system fails in urban or suburban area?

threat of waterborne disease

When minimum lot size cannot be met, system must be designed by

Professional Engineer or Professional Sanitarian

What is the most critical soil characteristic

the ability to absorb wastewater

Where does most of the wastewater treatment occur

In the soil, not the tank

What is the primary criteria for OSSF selection

it will function properly

What are some secondary criteria for selecting an OSSF

cost, minimal maintenance, simplicity of operation, long term reliability

System loading needs to be equal to or less than what

System Capacity

Typical wastewater composition

Total solids 700-1,000 mg/L
Total suspended solids 180-300mg/L
Total Nitrogen 40-50mg/L
Grease 90-110 mg/L

What is the usage rate per day for 3 bedroom house

300/240 gallons with water savers

What types of systems can Installer 1 construct and repair?

standard absorptive drainfield
unlined ET evaporative drainfield
Leaching chamber drainfield
Pumped effluent drainfield
Gravel less pipe drainfield
Soil substitution
Holding tank

Can an Installer 1 construct a conventional system with a septic tank as pretreatment?

yes

What is the minimum gallons in this first tank of a 3 tank system

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