California Water Treatment T4 Exam Prep FREE Sample Exam

Why are nonpoint contamination sources in a watershed managed with land practices rather than with a treatment device at a discharge point?

Because nonpoint contaminants are harmless until they reach a pipe, so no control is needed until a discharge point forms

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Because their loading arrives diffusely, in runoff from fields, roads, and septic areas across the watershed, so there is no single pipe to treat and control must reduce or intercept the runoff itself

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Because nonpoint sources are illegal everywhere in a watershed, so enforcement alone removes them without any land work

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Because nonpoint loading enters only through the groundwater and never travels in surface runoff to an intake

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How many gallons does a rectangular source-water basin hold if it measures 56 ft by 18 ft and the water in it stands 12 ft deep?

90,478.08 gal

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12,096.00 gal

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45,239.04 gal

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180,956.16 gal

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Besides its small footprint, a ballasted flocculation system is noted for which operating characteristic?

It clarifies best at very low loading, well below the rates a conventional basin can handle

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It requires no coagulant or polymer at all, because the ballast alone destabilizes the particles

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It must be rested for long periods between runs so the ballast can regain its settling weight

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It responds quickly to flow and raw-water changes, because its process detention is short

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Day-tank drawdown shows fluoride chemical usage running at about twice the calculated feed for a week, yet finished-water fluoride stays right at target and the feeder calibration check is accurate. What does this discrepancy most likely mean, and what should be investigated?

The plant is overfeeding, so the dose should be cut in half until the usage figures line up with the calculation again

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Chemical is being lost between the day tank and the injection point — a leaking line, fitting, or tank — so the feed path should be inspected for the loss rather than the dose changed

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The natural background fluoride has doubled, so the extra chemical is being consumed before it can appear in finished water

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The scales under the day tank have failed, so the drawdown record should simply be discarded and the matter closed

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A finished-water pump delivers 840 gpm against a total head of 148 ft, and the pump efficiency at that duty is 79%. Using Brake Hp = Water Hp / pump efficiency, what brake horsepower must the motor supply to the pump shaft?

About 31.4 hp

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About 35.2 hp

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About 44.8 hp

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About 39.7 hp

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Bearings have just been replaced on a blower, and the crew is ready to start it. What must be verified about the lubrication system before the start?

The system must be refilled or confirmed at the correct level with the correct oil, because a dry or wrongly filled start destroys new bearings in minutes

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The system must be drained and left empty for the first hour, because new bearings seat themselves best while running without an oil film

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The system must be overfilled above the sight glass, because new bearings consume oil rapidly until their surfaces polish themselves smooth during the first weeks under load

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The system must be filled with whatever oil is on hand, because bearing lubrication tolerates any grade during the short break-in period

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The secondary, aesthetic guideline level for odor in drinking water is expressed as:

A threshold odor number of 15

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Three odor descriptors matched on a standard list

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A maximum of three customer complaints in any month

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A threshold odor number of 3

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A quality-control spike adds 20.0 mg/L of a substance to a sample, and the analysis recovers 17.7 mg/L of the added amount above the sample’s own level. What is the percent recovery?

17.7 percent

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113.0 percent

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88.5 percent

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97.7 percent

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Why do responsibly set water rates include an amount for reserves?

So the system can lower rates every year by spending the reserve on routine monthly operating expenses as they come due

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Because reserves are a substitute for an operating budget and remove the need to track day-to-day treatment costs at the plant, since the same answer is expected to serve for small groundwater systems and large surface-water plants alike

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Only to satisfy auditors, since reserve funds may never lawfully be spent on the water system that collected them from customers, without regard to the plant's classification, its source water, or the experience of the operators involved

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To build funds over time for equipment replacement, capital needs, and emergencies, instead of funding them from a single year's rates when they occur

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Which task does NOT belong to a Regional Board?

Overseeing cleanup of contaminated sites and leaking storage tanks that threaten water quality within the board's region, without regard to the plant's classification, its source water, or the experience of the operators involved

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Permitting and regulating discharges of waste to land and to surface and ground waters within the board's region

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Adopting regional water quality plans and objectives that protect the beneficial uses of waters in the board's region, since the same answer is expected to serve for small groundwater systems and large surface-water plants alike

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Running the drinking-water program of system permits, drinking-water standards, and operator certification for public water systems

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For a storage adequacy review, a finished-water tank holds 864,000 gallons and is drawn down at 500 gpm. How many hours of storage does the tank provide at that draw rate?

19.2 hours

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34.6 hours

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28.8 hours

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24.0 hours

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An industry proposes a new waste discharge to the stream above the system’s intake and asks the chief operator to approve it. What is the correct administrative response?

Approve it, because the intake is downstream and dilution will protect the source after a brief review, because the industry has assured the plant that its discharge will meet all limits at all times

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Deny it permanently, because no discharge may ever be permitted upstream of an intake by written order of the chief operator, which is binding on any discharge anywhere in the watershed above the intake

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Refer it to the Regional Board, which permits waste discharges affecting water quality, while the system tracks the risk through source monitoring and intake and treatment decisions

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Approve it on condition that the industry pays the system's treatment costs, calculated from the system's average treatment costs over the preceding five years and adjusted annually thereafter

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California Water Treatment T4 Exam Prep FREE Sample Exam — Fixed Set

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