CALIFORNIA WATER DISTRIBUTION GRADE 3 TEST WITH
LATEST UPDATED (QUESTIONS AND ANSWERS) ALREADY
PASSED!
R.P.P.A. Correct Answers Reduced pressure principal assembly.
Backflow prevention for back siphonage and back pressure.
American Public Works Association color codes.
White,pink,red,yellow,orange, blue, purple and green Correct Answers
White=proposed excavation
Pink=temporary survey markings
red=electric power
yellow=gas,oil and steam
orange=communications(phone/cable)
blue=water
purple=reclaimed water
green=sewer and storm drains.
Distance between water and sewer lines. Correct Answers Running
parallel-at least 10ft apart.
Perpendicular crossing-water lines at least 1ft above sewer.
Common trench-water and sewer must not be in same trench.
,Water main and force main regulations. Correct Answers Parallel-at
least 10ft apart.
Perpendicular crossing-Water lines at least 1ft above and force main
should be encased 10ft in both directions.
New water lines installed over force mains should be rated to 200psi or
equivalent.
Force mains over 1000ft must have clean outs every 600ft.
Fire extinguishers Class A, B, C, D and K Correct Answers A=ordinary
combustibles. Wood, paper, cloth trash and plastic.
B=Flammable liquids. Gasoline, petroleum oil and paint.
C=Energized electrical equipment. Motors, transformers and appliances.
D=Combustible metals. Potassium, sodium, aluminum and magnesium.
K=Cooking oils and grease.
Drawdown Correct Answers Difference between the static pumping
level and the pumping water level.
Residual drawdown Correct Answers A lowered water level that
remains for a period of time after pumping has been stopped.
, Cone of depression Correct Answers Depressed water surface around a
well when pumps are operating.
What is Coliform Bacteria? Correct Answers A group of bacteria found
in the intestines of warm blooded animals. Also found in plants, soil, air
and water. It's positive test is and indication that the water is polluted
and may contain pathogenic (disease causing) organisms. Most coliform
bacteria are not necessarily bad for you, but are used as an indicator to
warn of more harmful bacteria. Testing this way is the easiest, most
efficient and least expensive way.
E. coli, however, is a type of coliform bacteria (fecal) that can make
people sick.
4 types of corrosion Correct Answers Chemical: Low PH/ soft water
Electrical: Galvanic reaction of dissimilar metals where one erodes the
other.
Erosion: Velocity greater than 5 feet per second erodes pipes and bends
like sandpaper over time. Also increases dissolved oxygen content in
highly oxygenated water.
Biological: Living organisms-Iron bacteria and sulfate reducing bacteria.
Common in ground water.
LATEST UPDATED (QUESTIONS AND ANSWERS) ALREADY
PASSED!
R.P.P.A. Correct Answers Reduced pressure principal assembly.
Backflow prevention for back siphonage and back pressure.
American Public Works Association color codes.
White,pink,red,yellow,orange, blue, purple and green Correct Answers
White=proposed excavation
Pink=temporary survey markings
red=electric power
yellow=gas,oil and steam
orange=communications(phone/cable)
blue=water
purple=reclaimed water
green=sewer and storm drains.
Distance between water and sewer lines. Correct Answers Running
parallel-at least 10ft apart.
Perpendicular crossing-water lines at least 1ft above sewer.
Common trench-water and sewer must not be in same trench.
,Water main and force main regulations. Correct Answers Parallel-at
least 10ft apart.
Perpendicular crossing-Water lines at least 1ft above and force main
should be encased 10ft in both directions.
New water lines installed over force mains should be rated to 200psi or
equivalent.
Force mains over 1000ft must have clean outs every 600ft.
Fire extinguishers Class A, B, C, D and K Correct Answers A=ordinary
combustibles. Wood, paper, cloth trash and plastic.
B=Flammable liquids. Gasoline, petroleum oil and paint.
C=Energized electrical equipment. Motors, transformers and appliances.
D=Combustible metals. Potassium, sodium, aluminum and magnesium.
K=Cooking oils and grease.
Drawdown Correct Answers Difference between the static pumping
level and the pumping water level.
Residual drawdown Correct Answers A lowered water level that
remains for a period of time after pumping has been stopped.
, Cone of depression Correct Answers Depressed water surface around a
well when pumps are operating.
What is Coliform Bacteria? Correct Answers A group of bacteria found
in the intestines of warm blooded animals. Also found in plants, soil, air
and water. It's positive test is and indication that the water is polluted
and may contain pathogenic (disease causing) organisms. Most coliform
bacteria are not necessarily bad for you, but are used as an indicator to
warn of more harmful bacteria. Testing this way is the easiest, most
efficient and least expensive way.
E. coli, however, is a type of coliform bacteria (fecal) that can make
people sick.
4 types of corrosion Correct Answers Chemical: Low PH/ soft water
Electrical: Galvanic reaction of dissimilar metals where one erodes the
other.
Erosion: Velocity greater than 5 feet per second erodes pipes and bends
like sandpaper over time. Also increases dissolved oxygen content in
highly oxygenated water.
Biological: Living organisms-Iron bacteria and sulfate reducing bacteria.
Common in ground water.
