Wastewater Collection Class IV Exam Prep FREE Sample Exam

In a utility’s equipment standard, critical stations that use a variable frequency drive on a pump also specify a drive bypass. What operating need does the bypass provision serve?

It lets the drive run at two different carrier frequencies during a single pumping cycle on alternating weeks so that each drive carries the station load equally often

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It raises the pump's peak efficiency whenever the wet well is near its high level

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It lets the pump keep running at full speed if the drive itself fails or is taken out of service

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It replaces the need for a standby generator during a utility power outage at the station

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A chemical feed system doses odor-control chemical into a flow of 0.42 MGD at a dose of 16 mg/L. How many pounds of chemical per day must the feed system deliver?

About 56.04 lb/day

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About 6.72 lb/day

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About 112.10 lb/day

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About 28.02 lb/day

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Drone crews begin delivering sharp video of trunk structures, but the files sit in a separate folder system that the asset program cannot search or trend. What direction should the program head give?

Let the drone files stay separate, since video quality matters more than whether the asset program can retrieve the records later

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Delete drone findings that cannot be coded, so the asset database never shows a gap between inspected and recorded structures

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Have each drone operator keep personal copies as backup, and treat those copies as the official record of each inspection performed

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Require drone deliverables in the standard coding and asset record system, so findings trend with other inspection data

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An undersized main must be replaced with a larger pipe where it passes beneath a rail crossing, and the crossing owner will not permit open excavation in the crossing. What method direction should the director give?

Line the existing pipe and accept the smaller diameter, since no other method can work under a crossing

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Renew by pipe bursting, which replaces the host with a larger pipe along the existing alignment without open excavation

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Reroute the main around the crossing at whatever length and cost the detour requires

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Defer the renewal indefinitely, since an upsized replacement under a crossing is not achievable

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A CSO basin returns stored flow through a conduit with a cross-sectional area of 4.1 square feet at a velocity of 3.85 feet per second. What flow is the conduit carrying, in gallons per minute?

7,084.3 gallons per minute

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15.8 gallons per minute

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1,577.0 gallons per minute

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3,542.2 gallons per minute

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Plan drawings show the proposed trenchless renewal reach crossing beneath a pressurized water main, but the recorded depth of that main varies between two plan sets. Approving the method depends on the clearance. What should the director order?

Expose the crossing by careful vacuum excavation and confirm its true depth and position before the method is approved

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Approve the method using the shallower of the two recorded depths, since that is the more recent plan set

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Move the renewal reach to a different street so the crossing never has to be dealt with

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Let the renewal crew proceed slowly and stop only if they feel resistance at the crossing

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A proposed annexation would hand the utility a group of privately built stations of unknown condition, controls, and capacity. What direction protects the utility before it accepts operating responsibility?

Accept the stations immediately, at the closing ceremony, and discover their true condition gradually through day-to-day operations over the following years

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Refuse all annexations that include lift stations, whatever the area's needs

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Require a pre-acceptance assessment of condition, capacity, and control compatibility, with upgrades and funding identified before transfer

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Accept the stations but decline to maintain any equipment that is not already standard

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A force main’s air valves pass normal operating flows of air but are far too small to admit air fast enough when the main is drained, risking vacuum damage during maintenance. What does the fleet design standard need to require?

Air valve sizing checked for both operating release and the large air flows of filling and draining, not just operation

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A standing rule that force mains may never be drained for maintenance under any circumstances at any station in the fleet, ever

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Larger pumps so the main refills before a vacuum can form

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Removal of the undersized valves so the main can breathe through the station

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On a sewer installation project, the contractor’s grade records conflict with the utility’s check survey at several reaches, and backfilling is proceeding quickly. What should the monitoring and inspection program direct?

Require independent grade verification of the remaining reaches before they are covered, and resolve the conflicting reaches before acceptance

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Accept the contractor's records, because the installing party's paperwork is presumed correct whenever a conflict with the owner's survey appears during a project of this kind

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Average the two sets of elevations and record the midpoint as the as-built grade for every reach in dispute

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Stop all inspection on the project, since conflicting records mean inspection can no longer serve any useful purpose there

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Two hydrogen sulfide loggers a short distance apart on the same trunk have tracked each other almost exactly for a full season, while a concrete trunk with known corrosion has no sulfide monitoring at all. What is the best direction?

Redeploy one logger to the unmonitored corrosion reach, keeping the other as the continuing record at the original location

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Add a third logger beside the first two, so the agreement between instruments at that location becomes even stronger even if doing so leaves the underlying condition completely unmeasured

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Leave both loggers in place, because moving any instrument would break the continuity of both records at once

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Remove both loggers and rely on odor complaints to describe sulfide conditions on both trunks from now on

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A corrosion-control feed on a large interceptor treats 2.05 MGD at a dose of 2.8 mg/L. How many pounds of chemical are fed per day?

45.87 lb/day

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47.87 lb/day

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49.87 lb/day

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51.87 lb/day

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A sulfide-control feed serves a force-main discharge carrying 0.85 MGD, dosed at 5.2 mg/L. How many pounds of chemical are fed per day?

36.86 lb/day

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34.86 lb/day

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38.86 lb/day

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40.86 lb/day

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Wastewater Collection Class IV Exam Prep FREE Sample Exam — Fixed Set

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