CWEA Collections Grade 2 Practice Test | 75 Questions with 100% Correct Answers, Exams of Organometallic Chemistry

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Why are gasoline and volatile solvents objectionable when present in a sewer? - CORRECT ANSWERThey produce an explosion hazard You should never attempt to install, troubleshoot, maintain, repair, or replace electrical equipment unless: - CORRECT ANSWERYou know what you are doing, are qualified, and are authorized. How many different areas of traffic zones are there when working in roadways? - CORRECT ANSWERFive Why should hydrogen sulfide be controlled? - CORRECT ANSWERTo protect sewers and structures from corrosion Personnel entering a Permit Required Confined Space must have the following training:

• CORRECT ANSWEREntry and rescue procedures To find proper protective gear before application of a product, you would: - CORRECT ANSWERLook at the MSDS (Material Safety Data Sheet) The gas most commonly associated with septic wastewater is: - CORRECT ANSWERHydrogen Sulfide (H2S) The lack of an unpleasant odor in a structure does not always mean that dangerous gases are not present because: - CORRECT ANSWERSome dangerous gases have no odor What four conditions are necessary to create an explosion? - CORRECT ANSWERCombustible gas, adequate oxygen, sufficient heat, and proper mixing of gas and oxygen. What does "transition area" mean in traffic control? - CORRECT ANSWERMoves traffic out of its normal path The term "transition area" is one component of a: - CORRECT ANSWERTraffic Control Zone What elements should be considered to improve worker safety in High Speed Temporary Traffic Control Zones? - CORRECT ANSWERRerouting traffic around the work site, positioning of law enforcement officers in the temporary traffic control zone, and work zone training. What key factors would you need to address when developing an S.O.P. for Lift Station failure? - CORRECT ANSWERTraffic control plan, by-pass connections, and spill containment.

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"Spring Blades" are a type of tool used with: - CORRECT ANSWERPower Rodder Porcupine, Root Saw, and a Square Bar Cork Screw are all tools used for: - CORRECT ANSWERSewer rodding What tool would you use to cut VCP pipe? - CORRECT ANSWERChain pipe cutter Which conditions should a gas detection device test for? - CORRECT ANSWERHydrogen Sulfide, explosive/flammable gases, oxygen. What does "LEL" mean on a gas detection meter? - CORRECT ANSWERLower explosive limit The oxygen level alarm in a gas detection meter is normally set to go off at oxygen levels below: - CORRECT ANSWER19.5% When developing an S.O.P. for scheduled maintenance of electrical equipment, what program should be addressed as a primary safety guideline? - CORRECT ANSWERThe L.O.T.O. (Lock Out Tag Out) Program What document would you require to be referenced when developing an S.O.P. for hazardous substance spill cleanup as well as spill containment? - CORRECT ANSWERM.S.D.S. Placement of the Blower and P.P.E. are two things you would include in developing an S.O.P. for air monitoring in a: - CORRECT ANSWERPermit Required Confined Space According to a State Water Resources Control Board order, each Enrollee must develop and implement a system-specific: - CORRECT ANSWERSewer System Management Plan (SSMP) Category 1 SSO's that discharge to a drainage channel and/or surface water must be reported within: - CORRECT ANSWER2 hours 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: - CORRECT ANSWERthe GPS coordinates Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause odors, true or false? - CORRECT ANSWERTrue Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The problem is most likely caused by: - CORRECT ANSWERA decrease in velocity allowing organic and inorganic solids to settle out

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Barrels, lids, cones, and backflow devices are all included in Manholes, true or false? - CORRECT ANSWERFalse. All are included except for backflow devices. Sewer testing methods include air, water, mandrill, and sewage, true or false? - CORRECT ANSWERFalse. Sewer testing methods do not include sewage. Using high velocity cleaners is one method included in hydraulic sewer cleaning, true or false? - CORRECT ANSWERTrue A flow of 650 gpm would be how many MGD? - CORRECT ANSWER650 gpm x ( min / 1 day) = 936000 gpd 936000 x (1 MG / 1000000 gal) = 0.936 MGD One of the advantages of using CCTV is that the length and severity of defective pipe areas can be recorded, true or false? - CORRECT ANSWERTrue Offset joints are one hazard that may damage a TV camera going through a sewer, true or false? - CORRECT ANSWERTrue What is the total volume of 1000 feet of 8 inch line? - CORRECT ANSWERConvert inches to feet: 8 inches x (1 foot / 12 inches) = 0. Volume of a right regular cylinder: V = 0.785 x Diameter x Diameter x Length of Pipe V = 0.785 x 0.666 ft x 0.666 ft x 1000 ft V = 348.19 cu ft Convert to gallons: 348.19 cu ft x (7.48 gal / 1 cu ft) = 2604.47 gal If an 8 inch force main has a metered flow rate of 400000 gpd, what is the velocity? - CORRECT ANSWERVelocity = 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 During the 24-hour operation a lift station pumped 3000 gallons per minute for a community of 27000. What is the per capita pumped in gallons per day? - CORRECT ANSWERGPD / Capita = Volume Pumped Per Day / Number of people Volume = (3000 gal / 1 min) x (60 min / 1 hr) x (24 hr / 1 day)

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Volume = 4320000 gal GPD / Capita = 4320000 gal / 27000 people GPD / Capita = 160 A wet well 20 feet in diameter is filled with water to a depth of 10 feet. How many gallons does the tank contain? - CORRECT ANSWERVolume = 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 One way members of a bailing crew can communicate with each other is by using hand signals, true or false? - CORRECT ANSWERTrue Why must you always know the distance when a cleaning tool is in a sewer? - CORRECT ANSWERSo you know where obstructions or difficulties are encountered Emergency stoppages in pipelines may be cleared safely by use of high velocity cleaners, true or false? - CORRECT ANSWERTrue Rodents and insects can be controlled by spraying manholes with an approved pesticide, true or false? - CORRECT ANSWERTrue How many types of common shoring are there? - CORRECT ANSWER 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? - CORRECT ANSWERVelocity = 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 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? - CORRECT ANSWERVolume = 0.785 x Diameter x Diameter x Height Volume = 0.785 x 12 ft x 12 ft x 8 ft Volume = 904.32 cu ft Once enrolled in CIWQS, the "Collection System Questionnaire" must be updated at least every: - CORRECT ANSWER12 months

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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? - CORRECT ANSWERTrue 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? - CORRECT ANSWERTrue Maintenance programs are based on preventative and corrective maintenance principles, true or false? - CORRECT ANSWERTrue The goal of preventative maintenance is to avoid breakdowns, severe damage, or harmful depreciation, true or false? - CORRECT ANSWERTrue