問題一覧
1
Records are to be kept for how long?
3 years
2
What is the furthest an operator can live from a water system without having having permission from certification board to be further?
50 miles
3
How long must you’re bacteria records be kept?
5 years
4
What is the minimum free CL supposed to be at entry point (EP) and the bact sites?
0.2mg/l
5
What chemical is not used for PH adjustment?
ultraviolet light
6
Chlorine aka cl2 is what color
yellow/ green in color
7
A water system supplying water to public to at least 25 or more persons or 15 or more services, or 15 or more connections is considered a?
public water system
8
What is the minimum depth of well casing in the ground? (Or to bedrock)
20’
9
What is the minimum radius from well caseing what must be poored in concrete with a continuous bond?
3’
10
What is the minimum thickness of well house slab?
4”
11
If water main and sanitary seeer must cross
water on top of sewer is preferred with 18” of separation
12
Well must be cased within how many days of drilling?
7days
13
A cartified operator is required when?
A facility alters the physical or chemical characteristics of the water.
14
What is a PH level below 7 considered
acidic
15
What is an(ORC)
opporator in responsible charge
16
How many hours of professional training per year are required to retain certification?
6 hours
17
A pump pedestal must extent how far above floor?
18”
18
If injecting chloimines you must have what?
no free CL trace but a trace of free ammonia
19
How deep must a water main be?
30” or below the frost line wichever is deeper.
20
25 or more year-round residents or 15 or more service connections is a?
community water system
21
At “X” cross intersection requires how many valves?
3
22
What is the maximum length of a 2” main line
1000’
23
How long must you’re lead and copper records be kept?
12 years
24
If total coliform is being tested in colisure or colliery methods it must be?
incubated at 35 Celsius for 24 hours
25
Devices are too be tested how often?
annually
26
How far must an exit ladder extend from the top of a trench?
3 feet
27
What is the expansion ratio for chlorine?
450x
28
What is the minimum amount of free (CL2) required at MRT sites?
a trace of something
29
What happens to the CL+ H2O At a 4.5 and lower PH?
it will convert to hypochlorous acid (HOCI)
30
A 2” water line is considered a main unless
it comes off a longer main and is metered separately
31
How many testable connections (BPF) within a water system require a certified cross connection ORC?
5 or more
32
How many hours are required for continuing ed for a certification each year?
6 hours
33
You can have a sewer line within 50’ of well point if it?
isconstructed to water main standerds
34
The acceptable experience for a well certification exam are?
at least 50% of duty’s consist of active operation at a system with chem treatment or 2 or more wells
35
If a water line is dead ended the maximum amount of connections is?
20
36
Total coliform is used as a what?
indicator organism
37
Total coliform test usually takes how long?
24hours
38
How many times heavier than air is (CL2)
2.5x
39
What is breakpoint chlorine?
when the chlorine demand is met and there is chlorine left over
40
At what minimum depth would a trench require cave in protection?
5’
41
What is the minimum requirement of free CL at the bact T sites?
0.2mg/l
42
What are (MCL’s)?
maximum contaminate level
43
What are the minimum and maximum PH levels in a water system per state requirements?
6.5-8.5
44
Sodium hypochlorite aka?
Bleach
45
The Carolina slate belt must have a well casing depth of?
43’ minimum
46
What kind of pump can be used to produce the same volume no matter the head pressure?
positive displacement pump
47
Separation between water mains and sanitary sewer line must be
10 feet horizontaly
48
At “T” intersections how many valves are required?
2
49
When chlorine is present what is the maximum Hight of an exhaust fan in building?
8”
50
How far must any structures be from well point be
100’
51
Well casing must extend how far above well house floor/slab
6” minimum
52
If feeding chlorimines you must have what left over at bact sites and (EP) entry point?
1.0ppm
53
Well casing must extent at least how far from ground level?
12”
54
If a 2” line is looped into a larger main the maximum connections is
40
55
Fire hydrants are to be at least on what size water line
6”
56
Graveyards must be at least how far away from well point
300 feet
57
Extreme eastern NC can have a minimum of what depth for well case?
10’
58
How far must a water main be from other underground utilities a minimum?
12”
59
What is the maximum depth of a trench before you must have exit ladder or ramp?
4 feet
60
How are chloamines formed?
addition of chlorine and ammonia together