CWEA Collections Grade 2 Practice Test: Questions and Answers, Exams of Physics

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CWEA Collections Grade 2 Practice Test.

Questions and Correct Answers. Graded

A

"Spring Blades" are a type of tool used with: - ANSPower Rodder A clogged impeller can cause a pump to deliver less than its expected rate of discharge, true or false? - ANSTrue A flow of 650 gpm would be how many MGD? - ANS650 gpm x (1440 min / 1 day) = 936000 gpd 936000 x (1 MG / 1000000 gal) = 0.936 MGD A person who completes a training program in accordance with the requirements of Title 8, Calif. Code of Regulations, Minimum Guidelines of the Common Ground Alliance is considered a Qualified Person, true or false? - ANSTrue A wet well 20 feet in diameter is filled with water to a depth of 10 feet. How many gallons does the tank contain? - ANSVolume = 0.785 x Diameter x Diameter x Height Volume = 0.785 x 20 ft x 20 ft x 10 ft Volume = 3140 cu ft Convert to gallons: 3140 cu ft x (7.48 gal / 1 cu ft) = 23487.2 gal

According to a State Water Resources Control Board order, each Enrollee must develop and implement a system-specific: - ANSSewer System Management Plan (SSMP) After completing a Temporary Traffic Control setup for your work zone it is a good practice to: - ANSObserve how effective your TTC setup is working to control traffic and make the necessary changes to it if necessary An upright circular cylinder tank (flat bottom) has a diameter of 12 feet. When filled to a depth of 8 feet, what is the volume? - ANSVolume = 0. x Diameter x Diameter x Height Volume = 0.785 x 12 ft x 12 ft x 8 ft Volume = 904.32 cu ft Barrels, lids, cones, and backflow devices are all included in Manholes, true or false? - ANSFalse. All are included except for backflow devices. Before starting a maintenance operation in a basement located in the backyard of a residence you should contact the resident and politely as permission to enter the backyard, true or false? - ANSTrue Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause odors, true or false? - ANSTrue Category 1 SSO's that discharge to a drainage channel and/or surface water must be reported within: - ANS2 hours

How many different areas of traffic zones are there when working in roadways? - ANSFive How many types of common shoring are there? - ANS How often must an excavation site and adjacent areas be inspected for hazardous conditions? - ANSDaily If an 8 inch force main has a metered flow rate of 400000 gpd, what is the velocity? - ANSVelocity = Flow / Area Area = 0.785 x Diameter x Diameter When finding Area, convert Diameter into feet 8 in x (1 ft / 12 in) = 0.667 ft Area = 0.785 x 0.667 ft x 0.667 ft = 0.349 sq ft Convert flow in gallons to cubic feet per second: (400000 gal / 1 day) x (1 cu ft / 7.48 gal) x (1 day / 24 hours) x (1 hr / 60 min) x (1 min / 60 sec) = 0.619 cu fps Velocity = 0.619 cu fps / 0.349 sq ft Velocity = 1.77 fps If it takes 7 minutes and 30 seconds for dye to travel a distance of 860 feet through an 8 inch sewer, what is the velocity in feet per second? - ANSVelocity = Distance / Time Convert minutes to seconds: 7 min (60 sec / 1 min) = 420 sec Velocity = 860 ft / (420 sec + 30 sec) Velocity = 860 ft / 450 sec

Velocity = 1.91 fps Infiltration can be caused by cracked pipes, true or false? - ANSTrue Infiltration from a high water table can be one source of excessive clear water in a collection system, true or false? - ANSTrue Lift station failure can include electrical circuit failures, true or false? - ANSTrue Maintenance programs are based on preventative and corrective maintenance principles, true or false? - ANSTrue Minimum design velocity for a sewer should greater than: - ANS2 feet per second Offset joints are one hazard that may damage a TV camera going through a sewer, true or false? - ANSTrue Once enrolled in CIWQS, the "Collection System Questionnaire" must be updated at least every: - ANS12 months One of the advantages of using CCTV is that the length and severity of defective pipe areas can be recorded, true or false? - ANSTrue One way members of a bailing crew can communicate with each other is by using hand signals, true or false? - ANSTrue

Temporary traffic control lanes created as part of a Temporary Traffic Control Zone setup on a street with a 35 MPH maximum speed limit shall be a minimum width of: - ANS10 feet The gas most commonly associated with septic wastewater is: - ANSHydrogen Sulfide (H2S) The goal of preventative maintenance is to avoid breakdowns, severe damage, or harmful depreciation, true or false? - ANSTrue The interior of 300 feet of 12-inch pipe is uniformly coated with one inch of grease. How many gallons will this pipe hold when filled with water? - ANS12 inches (diameter of pipe) - 2 inches (grease on pipe) = 10 inches Convert inches to feet: 10 inches x (1 foot / 12 inches) = 0.833 feet Volume of a right regular cylinder: V = 0.785 x Diameter x Diameter x Length of Pipe V = 0.785 x 0.833 ft x 0.833 ft x 300 ft V = 163.41 cubic feet Convert to Gallons: 163.41 cu ft x (7.48 gal / 1 cu ft) = 1223.31 gal The lack of an unpleasant odor in a structure does not always mean that dangerous gases are not present because: - ANSSome dangerous gases have no odor The lowest point on the inside of a pipeline is called the: - ANSInvert

The main reason for adding sodium hypochlorite to sewers is to control: - ANSOdor The oxygen level alarm in a gas detection meter is normally set to go off at oxygen levels below: - ANS19.5% The term "transition area" is one component of a: - ANSTraffic Control Zone To find proper protective gear before application of a product, you would: - ANSLook at the MSDS (Material Safety Data Sheet) To report in the Statewide SSO Data-base California Integrated Water Quality System (CIWQS), regarding the location of a Category 2 SSO, you must know: - ANSthe GPS coordinates Using high velocity cleaners is one method included in hydraulic sewer cleaning, true or false? - ANSTrue Vitrified Clay pipe is a Rigid type of pipe, true or false? - ANSTrue What document would you require to be referenced when developing an S.O.P. for hazardous substance spill cleanup as well as spill containment?

• ANSM.S.D.S.

What key factors would you need to address when developing an S.O.P. for Lift Station failure? - ANSTraffic control plan, by-pass connections, and spill containment. What tool would you use to cut VCP pipe? - ANSChain pipe cutter When a citizen wants information regarding a maintenance operation you should give them as much factual information as you can, and offer to help them further, true or false? - ANSTrue When developing an S.O.P. for scheduled maintenance of electrical equipment, what program should be addressed as a primary safety guideline? - ANSThe L.O.T.O. (Lock Out Tag Out) Program Which conditions should a gas detection device test for? - ANSHydrogen Sulfide, explosive/flammable gases, oxygen. Why are gasoline and volatile solvents objectionable when present in a sewer? - ANSThey produce an explosion hazard Why are wear rings installed in a pump? - ANSTo concentrate wear on rings instead of volute and impeller Why must you always know the distance when a cleaning tool is in a sewer? - ANSSo you know where obstructions or difficulties are encountered

Why should hydrogen sulfide be controlled? - ANSTo protect sewers and structures from corrosion Working in an un-sloped trench with no shoring is one option of Protective Shoring Systems, true or false? - ANSFalse. Some options are proper stopping or benching of the sides of the excavation, supporting the sides of a trench with shoring, and using a shield in the excavation area. You receive a call at 4:30 pm about a sewer spill that was seen spilling since 2 pm. You arrive at 5:15 pm and estimate the sewer spilling at 166 gpm. You clear the stopage 22 minutes after your arrival. How many gallons were unrecoverable? - ANSDuration x Flow Rate = Spill Volume 217 min x 166 gpm = 36022 gal You received a sewer spill call at 1100 hours, arrived on site at 1115, and your crew relieved the stoppage at 1127. You estimate the spill was running at 6 gallons per minute. How much sewer went un-captured? - ANSDuration x Flow Rate = Spill Volume 27 min x 6 gpm = 162 gallons You should never attempt to install, troubleshoot, maintain, repair, or replace electrical equipment unless: - ANSYou know what you are doing, are qualified, and are authorized.