California Wastewater Grade 1 Exam Prep FREE Sample Exam

When an unsafe condition is found during a plant round, what is the correct response?

Work around the condition and finish the round without mentioning it to anyone else on shift

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Wait until the condition causes an injury or equipment damage before reporting it to a supervisor

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Report the condition so it can be corrected rather than working around it

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Cover the condition with equipment or materials so it is no longer visible during inspections

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A primary clarifier influent sample shows 235 mg/L suspended solids and the effluent shows 98 mg/L. What is the percent removal?

58.3%

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41.7%

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65.0%

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139.8%

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A supervisor asks an operator to schedule lubrication for the clarifier drives using plant records. Which record directly supports that scheduling?

The daily influent flow totals recorded at the Parshall flume over the same period as the maintenance

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The laboratory suspended solids results for the primary effluent samples collected during the prior week

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The count of loads of screenings hauled away from the headworks since the drives were last serviced fully

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The equipment run hours logged for the drives on every shift

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The sludge blanket in a primary clarifier is rising toward the surface. What is the best first operating response?

Increase the sludge pumping or withdrawal rate

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Stop all sludge pumping until the blanket settles

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Raise the effluent weirs above the water level

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Add more influent flow to the clarifier

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A plant flow of 0.47 MGD carries a solids concentration of 185 mg/L. How many pounds per day of solids are in the flow?

86.95 lb/day

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725.16 lb/day

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7,251.63 lb/day

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3,282.77 lb/day

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A plant produces more digester gas than it needs for heating on a given day. How is the excess gas properly handled?

It is released raw at ground level beside the digester building

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It is burned in a flare (waste gas burner) or used as fuel

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It is piped into a confined space to displace stale air there

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It is stored in an open tank until the pressure builds up again

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A drum of sodium hypochlorite solution has been stored warm, near acid containers, for a long period. What should the operator expect and do?

Expect gained strength; warm storage near acids improves the solution when checked during a normal working shift

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Expect lost strength; store hypochlorite away from acids and heat and check its condition

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Use it without checking, since hypochlorite never changes in storage

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Mix it with acid to restore strength before feeding it

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A pond receives a BOD load of 186 lb/day over a surface area of 6.2 acres. What is the organic loading?

24 lb/day/acre

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37.2 lb/day/acre

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18.6 lb/day/acre

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30 lb/day/acre

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Why is a flow-proportional composite preferred for representing loading?

It can be stored warm without changing

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It eliminates the need to label the sample bottle with location, date, or time

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Its portions vary with flow, matching the load carried

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It measures chlorine residual at one instant

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A 150 mL portion of a well-mixed sludge sample is filtered and dried, leaving a residue of 36.9 mg. What is the solids concentration?

0.246 mg/L

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24.6 mg/L

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2,460 mg/L

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246 mg/L

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One primary clarifier is taken out of service for maintenance while the plant keeps treating wastewater through the remaining units. Does the certified-staffing requirement still apply during this period?

No, staffing rules pause whenever any unit is down

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Only if the maintenance lasts longer than one shift

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Only the maintenance crew needs to be certified during the work, and then only while the removed unit is actually open for repair

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Yes; the plant is still operating, so it must remain properly staffed by certified operators

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A storm causes a bypass of untreated wastewater at a plant. What duty does this event trigger for the operating staff?

Wait a full month before mentioning it to anyone, so the monthly summary can be prepared first and the event described in general terms only

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Notification to the overseeing authorities, as the permit requires for bypasses

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Record it only in a private notebook kept at home

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Report it only if a neighbor happens to complain

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California Wastewater Grade 1 Exam Prep FREE Sample Exam — Fixed Set

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