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