California Wastewater Grade 2 Exam Prep FREE Sample Exam

Pathogens carried in wastewater belong to which class of plant hazard?

Electrical hazard

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Mechanical hazard

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Biological hazard

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Physical noise hazard

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A clarifier with 900 square feet of surface area receives 877,500 gallons per day. What is its overflow rate?

975 gpd/sq ft

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487.5 gpd/sq ft

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1,462.5 gpd/sq ft

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1,950 gpd/sq ft

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During a digester cleaning, the crew finds a deep layer of grit that has steadily reduced the tank’s working volume. Which upstream check does this finding call for?

Check whether the chlorine contact basin residual has been high enough over the past operating season

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Check digester heating and mixing first

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Evaluate grit removal performance, since grit that passes fills downstream tanks

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Check the effluent weirs on the primary clarifiers

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The sludge blanket in a secondary clarifier is deepening while the aeration basin MLSS is dropping. Which adjustment moves the solids back where they belong?

Waste much more sludge each shift so that less sludge remains anywhere in the system at all

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Increase the return activated sludge rate to transfer settled solids from the clarifier back to the basin

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Decrease the return rate further so the clarifier can compact a much thicker blanket

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Stop aeration for a while so the floc in the basin settles and the blanket stabilizes without waiting for any laboratory result to come back first

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Settleability tests over several days show settling getting poorer and the clarifier blanket climbing, a bulking pattern. Which response follows sound Grade II practice?

Double the wasting rate and halve the return rate on the same day so the correction takes effect quickly during the busiest part of the operating shift

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Stop all wasting for two weeks so the organisms can recover without disturbance

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Drain the aeration basin and reseed it with sludge hauled from the nearest neighboring plant

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Verify dissolved oxygen, follow the SVI trend, and adjust return or wasting gradually — one change at a time, then observe

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Primary clarifier percent removal dips on a day when a larger-than-usual volume of digester supernatant was returned to the influent, while flows and blanket depths stayed normal. How should the lead operator interpret this?

As proof the clarifier scrapers have failed and must be replaced that same shift and the clarifier must be drained for a full internal inspection before the next shift

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As an added load effect from the returned supernatant, to be weighed before faulting the clarifier itself

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As a disinfection problem, since supernatant return sets the chlorine demand

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As normal wet-weather washout, even though no storm flows occurred that day

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At the recognition level expected at Grade II, polymer in solids handling is understood as what?

A conditioning practice sometimes applied to dewatering feeds before mechanical dewatering

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A disinfectant added to digested sludge to destroy pathogens before hauling off site

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A heating fuel burned in the digester boiler in place of collected digester gas

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A coagulant dosed to the gravity thickener to settle incoming raw wastewater

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A plant disinfects 0.042 million gallons of effluent in a day at a chlorine dose of 9.5 mg/L using chlorine gas. How many pounds of chlorine are used that day?

0.40 lb

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3.33 lb

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27.75 lb

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2.50 lb

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Dye added at a pond inlet reaches the outlet far sooner than the detention time suggests, and large areas of the pond look stagnant. What corrective approach fits this problem?

Deepen the stagnant areas by adding fill until the pond holds twice its present working volume

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Raise the chlorine dose at the outlet

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Use baffles or multiple cells in series to prevent short-circuiting

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Stop all influent flow for a full week

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A final effluent result comes back wildly out of line, but the plant looks normal and no process change was made. What is the first thing to check?

Whether the influent pumps need repacking

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Whether the aeration basins need new diffusers, new blowers, and a full process audit this week

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The chlorine supplier's delivery schedule

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Sampling error, such as the wrong point, a dirty bottle, or a stale sample

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During a loading check, flow through a grit channel is 8.0 cubic feet per second and the channel cross-sectional area is 1.5 square feet. What is the flow velocity?

12.00 ft/s

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5.33 ft/s

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8.00 ft/s

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0.19 ft/s

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How can education figure into qualifying for a higher wastewater certification grade, at the program-structure level?

Education cannot count toward qualification in any circumstance at all

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Education replaces the examination requirement for the higher grade

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Education can substitute for part of the experience requirement

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Education raises the plant's classification instead of the operator's grade

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California Wastewater Grade 2 Exam Prep FREE Sample Exam — Fixed Set

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