California Water Distribution Grade 3 Questions & Answer Already Solved 100%
Course
Water Distribution
Institution
Water Distribution
R.P.P.A. - Answer 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 - Answer White=proposed excavation
Pink=temporary survey markings
red=electric p...
California Water Distribution Grade 3 Questions &
Answer Already Solved 100%
R.P.P.A. - Answer 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 -
Answer 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. - Answer 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. - Answer 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 - Answer 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 - Answer Difference between the static pumping level and the pumping water level.
Residual drawdown - Answer A lowered water level that remains for a period of time after pumping has
been stopped.
Cone of depression - Answer Depressed water surface around a well when pumps are operating.
What is Coliform Bacteria? - Answer 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 - Answer 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.
What is corrosion? - Answer The gradual decomposition of a material over time by a chemical action.
Tier 1 violations - Answer Directly and immediately affect public health.
-Fecal coliform positive.
-Nitrite, nitrate or total MCL violation.
-Chlorine Dioxide MRDL violation.
-Turbidity MCL violation.
-Perchlorate MCL violation.
Relationship between Nitrates and methemoglobinemia. - Answer Nitrates are ingested and converted in
the body to a substance that reacts with oxyhemoglobin, the oxygen carrying blood protein, to form
methemoglobin, which cannot carry oxygen. Enough can be formed to deprive body tissues of oxygen
causing blue skin color(blue baby disease) and respiratory problems.
2 Groups involved in Nitrification - Answer Ammonia oxidizing bacteria
Nitrite oxidizing bacteria
Lead and Copper Rule - Answer Objective: control the corrosiveness of finished water to limit the
amount of lead and copper leached from pipes and fittings.
Collect first draw samples(sitting for at least 6 hours) from high risk residents.
Provides action levels instead of MCL's.
Action levels: Lead .015 ppm -Copper 1.3 ppm
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