WASTEWATER GRADE 1 TEST 2025 WITH

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WASTEWATER GRADE 1 TEST 2025 WITH

300 PRACTICE QUESTIONS AND CORRECT

ANSWERS/ WASTEWATER TREATMENT

OPERATOR GRADE 1 CERTIFICATION

TEST 2025 (BRAND NEW!)

Which one of the following infectious diseases is NOT transmitted by wastewater

• tetanus
• tuberculosis
• AIDS
• polio

the acquired immune deficiency syndrome AIDS virus How often should sedimentation basics with mechanical sludge removal equipment be drained and inspected?

• once a year

What is the most important reason to reduce turbidity?

• to remove pathogens

Which is the filtration flow rate through a manganese green-sand pressure filter?

• 2-3 gpm/sq. ft

The saying "When a filter is ripening", what does it mean?

• it is becoming more efficient in particle removal

Virgin green-sand can be regenerated by soaking the filter bed for several hours in

a solution of chlorine containing:

• 100 mg/L CL2

It is hardest to kill the organism that causes which one of the following illnesses?

• Cholera
• Typhoid 1 / 4

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• Cryptosporidiosis
• Infectious hepatitis
• Cryptosporidiosis

Disinfection of water wells with free chlorine requires exposure for ____at a concentration of _____

• 12 to 24hrs; 50 mg/L

Which role does the action of straining of suspended particles play during filtration?

• minor

The turbidity of settled water before it is applied to the filters (post sedimentation

process) should always be kept below:

• 1-2 ntu

What precipitate can foul a cation exchange resin?

• iron and manganese

What process works best from sequestering manganese?

• poly-phosphates and chlorine

When should poly-phosphates used for sequestration of iron and manganese from a well, be inject into the process?

• right after the water leaves the cell

Re-carbonation is:

• adding CO2 to the water

In the ion-exchange softening process, once the resin can no longer soften water it must be______

• regenerated

Under no circumstances should a composite sample be collected for which type of analysis?

• bacteriological 2 / 4

pg. 3 The number on monthly distribution system chlorine residual samples required is:

• based on population

What is the ideal indicator for pathogens

• coliform group bacteria

When one substance is dissolved in another and will not settle out, its is called a

________

• solution

Acids, bases, and salts lacking carbon are:

inorganic compounds Which type of violation requires an all clear notification to the public?

• tier I
• tier 2
• tier 3
• tier 4
• tier 1

How many coliform positive samples are allowed each month for water systems that collect less than 40 samples per month?

• 1

If a water sample tests positive for coliforms, the system must collect a set of

repeat samples within:

• 24 hours

A public water system has at least_____, service connections or serves____or more persons_____or more days each year.

• 15;25;60

Where are the sampling points located for required sampling of coliform bacteria in a community water system?

• at consumers' faucets

Which one of the following gases is least likely to collect in a below-ground vault? 3 / 4

pg. 4 carbon monoxide When working in a manhole, your vehicle, whenever possible, should be placed between the manhole and oncoming traffic OSHA requires that adequate protection, such as shoring, be placed in any trench that is

• ft or greater in depth

How far back from the opening of a trench should soil be excavated from that trench be placed

• ft at least

In a trench, ladders are required every 25 ft How many ladders are required to be in a 5-ft deep trench when 6 people are working down the trench

• ladders

which is not an essential ingredient for all ordinary fires?

• ignition source
• fuel
• heat
• oxygen

ignition source If some clothes are on fire, what class of fire is it?class D If some magnesium is on fire, what class of fire is it?3 What is the minimum number of people that should be on-site working at a confined space site? where one of them is entering a manhole

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