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Course L > Fourth Year - Block C Drainage, Waste & Venting and Private Sewage Disposal > Flashcards

Fourth Year - Block C Drainage, Waste & Venting and Private Sewage Disposal Flashcards

1
Q

When do you need a spectic tank and what is it’s purpose?

A

When the property is not hooked up to the city’s septic system.

Break down solids[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]

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2
Q

What are the two major components of a septic system?

A

Disposal field (Type 1).

Septic tank (Type 1)[][]]

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3
Q

What are the three layers that make up the effluent in a septic tank?

A

Scum - Top layer.

Clean liquid - Middle layer.

Sludge - Bottom layer[][][][]]

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4
Q

Where are the anaerobic bacteria present?

A

In the tank.

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5
Q

How long should a septic tank be able to hold sewage for?

A

24 hours.

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6
Q

What things would you consider when determining the expected daily sewage flow for a septic tank?

A

Cloths washer.

Garbage grinder.

Number of bedrooms.

Number of people[][][]]

Type of occupancy[][][]

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7
Q

What would determine the location of a septic tank?

A

Buildings.

Distance from property lines.

Water sources[][][][][][][][][][][][][]]

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8
Q

What types of things do you take into consideration when sizing a septic field?

A

Cloths washer.

Frost line[][][][]]

Garbage grinder.

Number of bedrooms.

Number of people[][][][]

Type of occupancy[][][][]

Type of soil[][][][][][][][][][]]

Water table[][][][][][][][][][]

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9
Q

What would you do if a septic tank is installed but you find that all the locations for a specific septic field end up being either too close to a property line or too close to a water source?

A

Install a pumpout (Holding tank - Drained once in a while).

No disposal field is used in this situation[][]][][][][][][][][][][][][][][]

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10
Q

What is the purpose of a distribution box?

A

Distributes the effluent to the field evenly.

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11
Q

What is the reason for the siphon tank being sized so that it discharges a large amount of effluent at one time?

A

Ensures that the entire disposal field is used.

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12
Q

What is the purpose of item “A” in the picture below?

A

To allow the cleanest liquid to enter.

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14
Q

What type of soil would you use as fill for a disposal field?

A

Porous soil in order to allow air to reach the gravel bed.

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15
Q

How do you test the suitability of the soil or the proposed disposal field?

A

Percolation test.

Dig two 12 x 12 holes 22 -32 inches in depth at either end of the field.

Test must be done for 1 hour to see how quickly ground absorbs water in the holes.

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16
Q

Rather than using a distribution box to distribute the clear effluent from a septic tank, you may instead install a header. How should the header be graded?

A

Level w/ the branches then sloped away from the header at a grade of 2” / 100 feet.

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17
Q

What would be required if a private sewage disposal system had the absorption field installed at an elevation above the septic tank?

A

Pump.

(Sump pump)

(To pump the effluent)

18
Q

When performing an inspection of a septic tank, you notice that there is very little scum in the tank. What is the cause?

A

Too much detergent from a cloths washer.

May have to change a broken outlet tee causing the scum to leave the septic tank.

19
Q

What is the most efficient and cost effective system to use for a disposal field containing 600 feet of laterals?

A

Install an effluent tank and bell siphon.

Discharges a large amount of effluent at one time.

20
Q

Which of the following would be the best location for a sewage disposal field?

A. Low lying area draining to a natural water course.

B. Elevelated and well ventilated[][][][][][][][][][][][][][][][][]]

C. Elevated and adjacent to the house[][][][][][][][][][][][]]

D. Lowest area next to a well[][][][][][][][][][][][][][][][][][][][][]

A

B. Elevelated and well ventilated.

21
Q

What is the grade of the pipe from a septic tank to the distribution box?

A

1/4” per foot or 1 in 50.

Same as any drainage pipe.

22
Q

What is the expected grade from the distribution box to the end of the lateral?

A

A slope of 2 inches per 100 feet.

23
Q

What is the minimum permissible length of a building drain to a septic tank?

A

1 meter (3 feet).

24
Q

If a septic tank is installed, how should the field be sloped?

A. Away from the house.

B. Towards the house[][]]

C. Level with the house[]]

D. Whichever way is the most convenient.

A

A. Away from the house.

25
Q

What is the gravel in a septic trenches main purpose?

A

Oxygen permeation.

26
Q

A septic tank uses a subsurface disposal field to distribute effluent evenly. A trench is dug in order to lay the disposal field piping. How much backfill (including both aggregate and porous soil) should be placed over the piping in order for oxygen to reach the effluent?

A

6 inches of aggregate and between 6 and 24 inches of porous soil.

27
Q

If a condensing boiler or furnace is attached to a septic system, what pH range should the water be neutralized to?

A

pH = 6 to 9.

28
Q

What is the distance to “source of drinking water, well or water suction lines” from dispersal systems (m/ft)?

A

30 meters/100 feet.

29
Q

What is the distance to “source of drinking water, well or water suction lines” from “watertight subsurface treatment tank(meters/feet)”?

A

15 meters/50 feet.

30
Q

What is the distance to “fresh water” from “dispersal systems (meters/feet)”?

A

30 meters/100 feet.

31
Q

What is the distance to “fresh water” from “watertight subsurface treatment tank (meters/feet)”?

A

10 meters/33 feet.

32
Q

What is the distance to “property lines” from “dispersal systems (meters/feet)”?

A

3 meters/10 feet.

33
Q

What is the distance to “property lines” from “watertight subsurface treatment tank (meters/feet)”?

A

1 meter/3 feet.

34
Q

What is the distance to “building dwelling (where there is not a perimeter drain)” from dispersal systems”?

A

3 meters/10 feet.

35
Q

What is the distance to “building dwelling (where there is not a perimeter drain)” from watertight subsurface treatment tank (metes/feet)”?

A

1 meter/3 feet.

36
Q

What is the distance to “utility services” from dispersal systems (meters/feet)?

A

1 meter/3 feet.

37
Q

What is the distance to “utility services” from watertight subsurface treatment tank (meters/feet)”?

A

1 meter/3 feet.

Course L (30 decks)

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