California Water Distribution D1 Exam Prep FREE Sample Exam

A reservoir is refilled after cleaning, but loose debris and organic material were left on the floor. What effect does that material have on disinfection?

None, because material on the floor cannot react with chlorine dissolved in the water stored above it during the holding period before sampling

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It exerts chlorine demand, consuming disinfectant that would otherwise remain as a residual

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It manufactures chlorine, so the measured residual rises on its own

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It seals the floor so well that no disinfection is needed at all

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A well contains 0.028 MG of water and is to be disinfected at a given dose of 60 mg/L using calcium hypochlorite that is 70% available chlorine. How many pounds of the solid product are required?

20.02 lb

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14.01 lb

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9.81 lb

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0.20 lb

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A crew must shut off water to one house for a plumbing repair without disturbing the main or neighboring services. The shutoff at the property line, ahead of the meter, is operated. Which fitting is this, and what is its role?

The corporation stop, which is the valve used to tap the main under pressure

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The meter stop inside the building, which isolates a single fixture branch

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A gate valve on the arterial main, which isolates the whole street segment

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The curb stop, which shuts off the individual service at the property line

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While reading meters, an operator sees a garden hose from a house bibb lying submerged in a backyard tank of mixed pesticide solution, with no device on the bibb. How should this be reported?

As routine yard use, because a hose bibb is part of the house plumbing and the tank is on private property

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As an unprotected cross-connection, because the submerged hose links the potable supply to a contamination source

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As a meter problem, because flow through a hose cannot be registered accurately

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As a dead-end condition, because the hose is the last outlet on that service

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How much does 1 gallon of water weigh?

7.48 lb

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8.34 lb

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62.38 lb

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3.785 lb

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A commercial meter showed 29,600 gallons at one reading and 87,200 gallons at a reading 32 days later. What was the average use in gallons per day?

1,800 gal/day

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57,600 gal/day

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900 gal/day

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3,650 gal/day

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Customers on a dead-end street report discolored water and a stale taste after a quiet period with little use on that street. What hydrant action addresses this?

Paint the hydrant a bright color and return it to service at once, since appearance is what customers judge the water quality by

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Close the hydrant's main valve and leave the street as is

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Remove the hydrant caps and leave them off overnight

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Flush the main through the hydrant to scour out sediment and stale water

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A homeowner offers to run the kitchen tap for a while before you collect the lead and copper sample so the water is fresh. What should you do?

Collect the sample first-draw, without flushing the tap beforehand

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Flush the tap thoroughly, then collect the sample in the bottle

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Collect the sample from the garden hose bib instead of the tap

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Run the hot water tap until it is warm, then collect the sample

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A crew member must move a container of a hazardous material and notices its label is damaged. What is the safe course of action?

Move it quickly to the truck so the damaged label is out of public view, and sort out what it was once it is safely inside the truck bed

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Guess at the contents from the container shape and handle it as usual

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Stop, identify the material and its handling requirements before moving it, using its safety information

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Pour the contents into a clean unlabeled container for the trip back

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Where a pipeline steps down from a larger diameter to a smaller one and keeps running straight, which fitting makes that size change?

Branch a side line off the main while the main continues through the junction

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Close the end of a dead-end main so it can be reopened for a future extension

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Connect a larger pipe to a smaller pipe, stepping the run down in size at the fitting

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Join two plain pipe ends of the same size in the middle of a straight repair

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A trench 25 ft long, 4 ft wide, and 3 ft deep must be filled with water for a test. How many gallons of water will fill the trench?

300 gallons

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1,122 gallons

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2,244 gallons

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7,480 gallons

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A presence/absence coliform test on a distribution sample reports absence. What does that result mean?

The entire distribution system is guaranteed free of bacteria

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The sample contained E. coli but at a level too low to report

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No coliform was detected in the sample volume tested

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No further routine monitoring is needed for the rest of the year

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California Water Distribution D1 Exam Prep FREE Sample Exam — Fixed Set

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