Water Distribution quiz

California DDW has set a minimum residual disinfection level for chlorine and chloramines in drinking water system at?

0.2 ppm free available chlorine and 0.2 ppm total chlorine residual

The California DDW requires public notification when primary contaminant like Total Trihalomethanes exceeds of the 80ppd quarterly running average. this type of contaminant does not pose an immediate public health risk and required PN with _____ days?

30 days

California DDW has set a maximum residual disinfection level for chlorine and chloramines in drinking water system at?

4 ppm free available chorine and 4 ppm total chlorine residual

when collecting a bacteriological sample for testing the collector should refrigerate the sample on a blue ice temperatures no less than _____ degrees Celsius and no more than ______ degrees Celsius

4 to 10

when a routine bacteriological coliform sample is confirmed positive for coliform presences water supplier must collect ______ within 24 hours

Repeat samples

When a routine total coliform sample is confirmed positive the water supplier can request invalidation from the DDW if they have a justifiable reason. if granted invalidation by DDWW the water supplier can collect a _____

Replacement sample

A detailed evaluation and/or inspection of a source water supply and all conveyances, storage, treatment and distribution facilities to ensure protection of the water supply from all pollution sources is called a?

Sanitary survey

Which type of maps are used by distribution operators to help locate water mains and valves in the water system?

Sectional Plat

Which chemical is used to neutralized chlorine in TCR water samples

Sodium Thiosulfate

Which agency enforce drinking water standards and regulations in community and non-community water system in California

State Water Resources Control Board Division of Drinking Water (SWRCB-DDW)

When a route total coliform sample is confirm positive for true presence of total coliform DDW require a repeat sample from the original sample point and two additional samples within?

5 service connections up and down stream of original sample point

heterotrophic plate count samples are collected in sterile sample bottles and are refrigerated the same as Total Coliform routine samples but must be analyzed within _____ hours of collection?

8 hours

A water sample pH indicates 6.0 this is?

Acidic

Which organization certify materials and chemical used in potable water system?

American National Standards Institute (ANSI/NSF)

when the pressure in the consumer's line exceeds the pressure in the water suppliers line _______occurs.

Back pressure

When a pressurized water main is shut down (isolated) for repair work a hydraulic condition occurs causing?

Back-siphonage

which of the following microorganisms is a protozoa?

Giardia Lamblia

A single water sample collected at no specific time that shows water characteristics at time of sampling is called a?

Grab sample

Living microorganisms that obtain their energy from carbohydrates and organic material are?

Heterotrophic

to capture the "worse case" by collecting samples most likely to have the highest lead and copper levels at the tap the 1991 LCR required targeted sampling for lead and copper at?

High-risk sampling sites

Which of the following is responsible for rotten egg odor in water?

Hydrogen sulfide

Which of the following are chlorine reducing elements and compounds?

Hydrogen sulfide, Ferrous iron and reduce Manganese

the study of water flow in aquifers and the characterization of aquifers is called ________?

Hydrogeology

Hard water caused by calcium and magnesium can ________ at POU?

Increase soap consumption

Which of the following is a health related primacy acute toxic contaminant that can cause blue-baby syndrome?

Nitrate

The imaginary surface to which groundwater rises under hydrostatic pressure in wells or springs is called?

Piezometric surface

which type of drawing is used by water utilities showing elevations plotted against distance, such as the vertical section or side view of a pipeline and the station numbers for determining distance between stations?

Profile

Copper and Lead found in drinking water at POU is mainly due to aggressive water in the?

Customer's plumbing

Listed below are 4 choices, 3 are elements and 1 is a compound, which one is the compound?

Water

The pH scales ranges from _______ to ________.

0 to 14

the minimum horizontal separation distance between a well and known or potential source of contamination such as a septic tank is?

100 feet

the minimum amount of water collected for a Heterotrophic Bacteria Counts (HPC) sample is ______?

100 ml

The lead and copper rule requires the sample collector allow the water to sit in the consumers kitchen faucet for 6 hours using a sample bottle with no preservatives added and collect _____?

1000 ml

A connection between a potable and non-potable water supply is called a?

Cross-connection

Water mains that are identified with a purple color convey which type of the water?

Beneficial use water

When pH exceeds pHs which of the following compounds can precipitate a thin layer of (scale) on the interior walls of the water mains?

Calcium Carbonate

which of the following chemicals compounds can precipitate a thin layer of (scale) on the interior walls of water mains when pH is high and the water temperature is high?

Calcium Carbonate

Hardness in drinking water is mainly caused by?

Calcium and Magnesium

A sample form used as a legal document that supports a sampling even and all data produced for that sample is called?

Chain of custody form

During weekly total coliform routine sampling you check the chlorine residual and find no detectable chlorine residual in the water analyzed, you should continue collecting the TCR routine sample and?

Collect an HPC sample

Which of the following are considered physical characteristics of water?

Color, Odor, Taste, Temperature and Turbidity

Which type of maintenance is not scheduled or planned, such as a main break?

Corrective

What well measurement must be known to calculate the specific capacity for a well?

Drawdown and discharge capacity

which of the following commodities make up the largest portion of an operations and maintenance budget in the water utilities?

Electric power and purchase water

Red water complains in a water system can be attributable to:

Ferric iron/oxidized

which of the following is used by water utilities to determine a water system's efficiency and requires examining records on water usage, system control equipment and water meter accuracy?

Water audit

Which type of water quality public notification requires community and non-community water agencies notify the public every year and poses no health treat?

Tier 3

An indicator organism commonly used to determine drinking water microbial contamination is:

Total Coliform bacteria

When certain natural organic matter or precursors found in source water and chlorine combine together in water during disinfection, by-products can be formed. these organic by products are called?

Total Trihalomethanes

A well that provides drinking water to a camping ground in a recreational area with less that 15 service connections and 25 year round customer is classified as a?

Transient non-community water system