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Prev Med 2 > Potable Water Surveillance > Flashcards

Potable Water Surveillance Flashcards

1
Q

What does FAC stand for?

A

Free Available Chlorine

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2
Q

What is the potable water surveillance afloat instruction?

A

NAVMED P-5010 Chapter 6

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3
Q

What is coaming?

A

Raised frame as around a hatchway in the deck of a ship

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4
Q

What is distillation?

A

Total process the distilling plant forms including evaporation and condensation

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5
Q

What is Free Available Chlorine

A

Chlorine available after demand is met

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6
Q

What is Point of Use

A

A treatment device applied to a single tap used for purpose of reducing contaminants in drinking water at that tap

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7
Q

What is reverse osmosis?

A

Reverse of natural osmosis achieved by external application of sufficient reverse pressure to cause the solvent to flow in an unnatural direction

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8
Q

what is colilert/colisure

A

used to detect total coliform and e-coli in potable water

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9
Q

what is total coliform

A

mostly harmless bacteria that live in soil and water as well as in guts of animals. the presence or absence of total coliform bacteria is the drinking water standard

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10
Q

what is e coli

A

a type of fecal coliform bacteria

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11
Q

who is responsible for shipboard potable water systems including treatment facilities

A

NAVSEASYSCOM

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12
Q

who is responsible for promulgating instructions for ship to shore potable water connections

A

NAVFACENGCOM

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13
Q

what is BUMED responsible for relating to potable water

A
  • establishing and promulgating health standards for water afloat
  • promulgate instructions, notices, or other publications to reflect afloat water quality recommendations
  • estbalish shipboard requirements for medical surveillance of potable water systems
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14
Q

who makes the water sanitation bill?

A

CO

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15
Q

what is engineering department responsible for relating to potable water

A
  • supply and treatment of potable water
  • ensuring all connections are made by authorized personnel
  • halogen and pH testing
  • ensuring minimum halogen residuals are maintained at a potable water tank before placing the tank online
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16
Q

medical responsibilities for potable water

A

BACTI testing
halogen testing
notify CO of discrepancies

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17
Q

how often is BACTI testing conducted

A

weekly

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18
Q

how often is halogen testing done by medical

A

daily

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19
Q

what is the minimum amount of water per person under normal conditions

A

50 gallons per day

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20
Q

what is the minimum amount of water per person while in water hours

A

2 gallons per day

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21
Q

what type of water is used for marine sanitation

A

sea water

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22
Q

what are the approved sources for potable water for naval ships

A
  • distillation, reverse osmosis, or other approved water production technology
  • shore to ship from an approved source
  • shore to ship from an unapproved source
  • ship to ship
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23
Q

when should you avoid making potable water

A
  • harbors or from polluted seawater
  • when ships are in close formation
  • when stripping or discharging waste or bilge water forward of saltwater intakes
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24
Q

who has to approve shore to ship public water supplies

A

EPA

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25
Q

whose bases can we pull in to and accept their potable water

A
  • british royal navy
  • canadian forces
  • royal australian navy
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26
Q

what is the minimum halogen residual for water from an unapproved source

A

2.0 ppm

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27
Q

what are the types of water distillation plants

A

steam distilling plants
waste heat
vapor compression type

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28
Q

what are the types of reverse osmosis plants

A

single pass

double pass

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29
Q

which requires further disinfection, single pass or triple pass reverse osmosis

A

single pass

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30
Q

who must approve potable water tank coatings

A

NSF/ANSI

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31
Q

what are the ways to measure water level in potable water tanks

A

automatic gauges
petcocks
sounding tubes

32
Q

what must sounding tubes be labeled with

A

“POTABLE WATER USE ONLY”

33
Q

what color symbolizes potable water

A

dark blue

34
Q

how high must potable water lines be kept off of the deck

A

18 inches

35
Q

what is the potable water temperature at the tap

A

120 degrees f

36
Q

what is kept inside potable water lockers

A

instructions for disinfection of hoses and risers (water sanitation bill)
-potable water hose

37
Q

when should potable water hoses be removed from use

A

when cracks develop in the lining or leaks occur

38
Q

describe labels on potable water hoses

A

1 inch high letters every 10 feet

39
Q

what is the minimum halogen residual requirement for water with doubtful quality

A

2.0 ppm

40
Q

what is the purpose of halogen residual testing

A

indicate potential contamination

41
Q

what is the purpose of bacti testing

A

ensure fitness for human consumption

assess adequacy of disinfection process

42
Q

halogenation is more effective at what temperature

A

higher temperature

43
Q

what is the minimum halogen residual at distal ends of water distribution systems on larger ships

A

trace

44
Q

how many bacti tests should be done with a crew of less than 400 people, 400-800 people, and 800 or more

A

<400: 4
400-800: 8
>800: 12

45
Q

water samples will include how many of ship’s ice machines and ship’s potable water tanks

A

1/4

46
Q

how often are emergency potable water tanks tested

A

monthly

47
Q

what are the methods of bacti testing

A

colilert or colisure

48
Q

what is the protocol if a bacti sample provides a negative test

A

3 repeat samples: one at the source, one up stream, one down stream

49
Q

what are the two methods of halogen residual testing

A

DPD 1 and DPD 4

50
Q

what is DPD 1 used to test for

A

FAC or TBR

51
Q

what is DPD 4 used for

A

(chloramine) total chlorine residual

52
Q

what is the accuracy of color comparator test

A

+/- 10 percent

53
Q

what is the accuracy of portable spectrophotometer test

A

+/- 2 percent

54
Q

continual absence of halogen residual in potable water system must be reported to who

A

CO with a copy to CHENG

55
Q

what must bacti samples be labeled with

A

location, date and time of collection, and sampler’s initials

56
Q

what temperature are bacti samples incubated at

A

35 Celsius

57
Q

list colilert abnormalities for positive samples

A

clear: negative
yellow: positive for total coliform
fluorescent yellow: positive for fecal coliform

58
Q

list colisure abnormalities for positive samples

A

yellow: negative
magenta: positive for total coliform
fluorescent light blue: positive for e. coli

59
Q

list sources of contamination of potable water

A

cross connection with non-potable systems
leaks in common bulkheads or in non-potable piping through water tanks
potable water hoses used for non-potable liquids
excessive storage time of water in tanks
deteriorate tank coatings
potable water tanks used for non-potable water liquids

60
Q

what are the approved methods for disinfecting shipboard potable water

A

chlorine and bromine

61
Q

what are the different types of water disinfection methods

A

automatic chlorine disinfection, brominator, and manual chlorine disinfection

62
Q

what is the least desirable method of water disinfection

A

manual chlorine disinfection

63
Q

what is the disinfectant of choice in manual chlorine disinfection

A

calcium hypochlorite (HTH)

64
Q

what is the chlorine dosage rule of thumb

A

one ounce of HTH per 5000 gallons of water equals 1.0 ppm FAC

65
Q

what is the minimum FAC/TBR concentration for water from an approved water source

A

0.2 ppm after 30 minute contact time

66
Q

what is the minimum FAC/TBR for water from an unapproved source

A

2.0 ppm after 30 minute contact time

67
Q

how many methods are there to disinfect the potable water system

A

3

68
Q

what is distinct about method 1 of potable water disinfection

A

10 ppm FAC throughout the tank for 24 hours

69
Q

what is distinct about method 2 of potable water system disinfection

A

200 ppm FAC to all tank surfaces

70
Q

what is distinct about method 3 of potable water system disinfection

A

5% of tank volume with 50 ppm FAC

71
Q

what are the two methods of controlling taste and odor in potable water

A

steam method and chlorination method

72
Q

what ppm of FAC for chlorination method

A

5.0 ppm at the tank, 2.0 ppm distributed

73
Q

who must approve use of the steam method

A

NAVSEASYSCOM

74
Q

what size bottle is HTH stored in

A

6 ounce bottles

75
Q

how many day supply of HTH must be kept as ready use stock

A

7 days

76
Q

how many bottles may be kept in store room stocks

A

48 bottles

77
Q

how long must medical keep a log of water tests

A

2 years

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