TCEQ: Class D Water Operator License 2024-2025. Questions and Correct Answers. Graded A, Exams of Water and Wastewater Engineering

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TCEQ: Class D Water Operator License 2024-

2025. Questions and Correct Verified Answers.

Graded A

___ is a buildup of oxidized iron, calcium carbonate or other chemicals in mains. A)tuberculosis B)tuberculation C)turbidity D)slime - ANSB "Stuffers" sent to customers in billing statements may contain... A)departments to call for service B)explanations of utility policy C)history of the utility D)tips on water conservation E)all of the above - ANSE A common filter problem is ___, prevented by proper backwashing. A)ice B)mud balls C)detention time D)coagulation - ANSB

A cross connection is a physical connection between a public water supply and 1)another supply of unknown or questionable quality 2)any source that may contain contamination 3) any water ___. A)safe to drink B)treated to potable quality C)treated to a greater degree D)treated to a lesser degree - ANSD A federal agency impacting the water utility industry is the... A)TNRCC B)EPA C)AWWA D)TWUA - ANSB A gallon of water weighs 8/34 pounds and 1 mg/l equal 1 ___. A)million grams B)thousand grams C)part per thousand D)part per million - ANSD A maximum allowable slope of 45 degrees and a run to rise of 1:1 is for soil type... A)stable rock B)class A C)class B D)class C - ANSC

A sample for physical and chemical analysis must be taken after ___ hours of pumping. A) B) C) D)63 - ANSC A sanitary control easement must cover land w/in ___ ft of public well. A) B) C) D)15 - ANSC A well may be developed by surging, overpumping, jetting, and... A)backwashing B)backflushing C)backflooding D)backfilling - ANSA After action is taken on a complaint, follow up with a phone call or ___ to make sure everything is satisfactory. A)post card B)e-mail C)letter

D)A&B

E)A,B,&C - ANSE

All pubic water systems are required to employ certified operators even if the system only ___ treated water bought from another source. A)Chlorites B)Sells C)Redistributes D)Stores - ANSC As the force a pump works against increases, the capacity and efficiency... A)increase B)decrease C)equalize D)stabilize - ANSB At room temperature chlorine gas is greenish-yellow, has pungent odor, is ___ times heavier than air. A) B)1. C)2. D)3 - ANSC Backwashing should expand the filter bed by ___ percent. A)5 to 10

B)15 to 20 C)25 to 30 D)30 to 50 - ANSD Benching is a type of sloping done by cutting stair steps in the trench wall while maintaining the maximum allowable ___. A)spoil B)slip C)slide D)slope - ANSD Besides disinfection, chlorine is used for taste and odor control and ___. A)oxidation of iron and manganese B)oxidation of hydrogen sulfide C)disinfection of repairs D)all listed - ANSD Bleach used in public water systems must be ___ approved. A) AWWA B) TEEX C) OSHA D) NSF - ANSD Calcium hypochlorite is made by reacting chlorine with ___. A)sodium

B)lime C)bleach D)salt - ANSB Calcium hypochlorite will cause explosions or fires if it contacts ___ material. A)organic B)inorganic C)suspended D)dissolved - ANSA Changes in well water levels or the volume of water produced can alert the operator to a drop in the water table, screen stoppage or damage to the ___. A)sealing block B)pump C)vent D)sampling faucet - ANSB Chemical characteristics include hardness, pH, solids, and... A)gases B)taste C)temperature D)color - ANSA Chemically, water is made of... A)one atom of water

B)one atom of hydrogen and one atom of oxygen C)two atoms of hydrogen and one atom of oxygen D)one atom of hydrogen and two atoms of oxygen - ANSC Chemicals used disinfection are chloramine, chlorine, chlorine dioxide, and ___. A)ferrous sulfate B)copper sulfate C)activated carbon D)ozone - ANSD Chlorination is the most important process in the production of ___ water. A)public B)private C)potable D)political - ANSC Closing a hydrant valve too fast can cause water ___. A)slammer B)boomer C)mallet D)hammer - ANSD Color in a public water supply should be... A)at least 15 units

B)under 3 units C)less than 15 units D)red - ANSC Common deep well pumps include the ___ and the vertical turbine. A)submarine B)subsidence C)submission D)submersible - ANSD Common pump problems include ___ and water hammer. A)proper alignment of pump and motor B)air-tight suction C)cavitation D)unclogged impeller - ANSC Copper sulfate in dosages of ___ and approved algaecides control algae blooms. A)10 to 50 mg/l B)1 to 5 mg/l C)0.1 to 0.5 mg/l D)0.01 to 0.05 mg/l - ANSC Delinquent payment notices should be... A) tactful + tasteful

B)mailed in envelope C)business-like D)all listed - ANSD Detention time in sedimentation basins must be at least ___ hours to allow floc at settle. A) 6 B) 5 C) 4 D)3 - ANSA Disinfection capacity for drinking water must be ___ percent greater than the highest expected dosage. A) B) C) D)60 - ANSC Do not place a main into service until a bacteriological sample is tested with ___ results. A)positive B)no C)negative D)doubtful - ANSC

Do not work in a trench ___ feet or deeper unless it is protected from cave-in. A) B) C) D)4 - ANSC Dosage is the amount of chemical applied, demand is the amount of chemical used up, ___ is the amount of chemical remaining after reacting with demand. A)breakpoint B)chloramine C)residual D)combined - ANSC Dose new mains with ___ mg/l or more of chlorine at least ___ hours. A)50, 24 B)24, 50 C)500, 24 D)5, 24 - ANSA Examples of community water systems include... A)municipalities B)municipal utility districts C)rural water supply corporations D)mobile home packs E)all the above - ANSE

Excavation spoil must be kept at least ___ feet from the excavation. A) B) C) D)5 - ANSA Excessive amounts of fluoride may cause ___ or staining of teeth. A)mottling B)molding C)cracking D)yellowing - ANSA Excessive nitrates in drinking water can cause ___ syndrome in infants. A)bad baby B)blue body C)bloody baby D)blue baby - ANSD Factors effecting sedimentation basins are the weight of floc, ___, detention time, and short circuiting. A)water temp B)water velocity C)taste and odor D)a&b - ANSA

Factors that make water more corrosive are low pH, dissolved oxygen, and ___. A)free chlorine B)combined chlorine C)free iron D)combined minerals - ANSA Feedlots, sewage treatment plants, and landfills must be at least ___ feet from a public well. A) B) C) D)50,000 - ANSB Flushing reduces slime and scale buildup, reduces red water complaints, brings chlorinated water to contaminated areas and removes ___-reducing materials from the system. A)chlorine B)iron C)calcium D)nitrate - ANSA Gas chlorinators use a rotameter to meter chlorine in ___ or grams/hr. A)lbs/minute B)lbs/hour

C)lbs/day D)gal/minute - ANSC Gases such as methane, carbon dioxide, and hydrogen sulfide are reduced by ___. A)backwashing B)sequestering C)aeration D)softening - ANSC Good treatment of employees include fair wages, benefits, and ___ working conditions. A)tense B)safe C)hazardous D)insecure - ANSB How many cubic yards of dirt are removed from a trench 60 feet long, 5 feet wide, and 5 feet deep? (LOOK AT PAGE 27) - ANSAnswer: 55.55 yards cubed How to Solve: Total Volume = 60 x 5 x 5 = 1500 feet Conversion factor of 27 feet cubed = 1 yard cubed 1500 divided by 27

How many gallons of water will a 20,000 cubic foot tank hold? (LOOK AT PAGE 27)

• ANSAnswer: 149,600 gallons How to Solve: Conversion factor of 1 cubic ft = 7.48052 gallons 20,000 times 7. Hydrogen sulfide is heavier than air, colorless, flammable, toxic, and has a ___ odor. A)sweet B)rotten egg C)rotten fish D)fragrant - ANSB Hypochlorinators consist on of a mixing tank, water, ___, hypochlorite or ___ hypochlorite and a chemical pump. A)sodium/calcium B)salt/lime C)hydrogen/oxygen D)green/yellow - ANSA If a ladder is used it must extend at least ___ feet above the edge of the excavation and be within ___ feet laterally of anyone in the excavation. A)3, B)2.5, C)2, D)3,25 - ANSD

If the excavation is ___ feet or deeper a means of exit must be provided. A) B)3. C) D)2.5 - ANSA If the soil is previously disturbed, it is... A)stable rock B)class A C)class B D)class C - ANSD If these reporters are attractive and easy to ___, they can build goodwill and trust with the customer A)misinterpret B)misconstrue C)misunderstand D)understand - ANSD In a water table well, the cone of depression is a ___ area around the well. A)dewatered B)depressed C)deflated D)developed - ANSA

In small water systems, the operator is often... A)a meter reader, repair crew, and pump operator B)highest paid employee C)college graduate D)all listed - ANSA In Texas, all public water systems are required to have ___ facilities. A)ozonation B)chlorination C)softening D)trihalomethane - ANSB In TX, water operator license is administered by the... A)EPA B)TNRCC -- TCEQ C)AWWA D)TWUA - ANSB Install a check valve in a pup discharge line to prevent water from flowing ___ during shutdown. A)back through the pump B)through a cross connection C)uphill D)from supply - ANSA

Job training for water utility operators is available through the... A)American Water Works Association B)TX Water Utilities Association C)TX Engineering Extension Service D)all listed - ANSD Lime is applied to water to ___... A)coat water mains B)adjust pH or alkalinity C)prevent tooth decay D)prevent algae - ANSB Listen to special requests and seek solutions to oblige the customer within... A)utility policy B)5 working days C)tradition D)secrecy - ANSA Livestock and septic tanks must be no closer than ___ ft to public well. A) B) C) D)5 - ANSC

Minimum chlorine residuals of ________ (free) and ________ (combined) are required in the far reaches of the distribution system. A)0.5/0. B)5/ C)2/ D)0.2/0.5 - ANSD Most ground water is relatively free of suspended matter, but ___ can be a major problem in surface water. A)turbidity B)gases C)sand D)hot water - ANSA Most surface water is low in minerals, gases, and ___. A)algae B)turbidity C)dissolved solids D)bacteria - ANSC NOTE: LOOK AT PAGE 27 ON MATH PROBLEMS RELATED TO TEST - ANS One of the components of the Right to Know law is employee access to ___. A)MDSS

B)MSSD

C)MSDS

D)MDDS - ANSC

One of the most important purposes of a public water supply is... A)swimming B)landscape watering C)car washing D)firefighting - ANSD One sample is required for each ___ feet of completed main. A)10, B) C) D)1,000 - ANSD Organic matter includes... A)sand B)plants, animals, and humans C)minerals D)all listed - ANSB OSHA classifies soil into four categories: ___ rock, class A, class B and class C. A)hard

B)stable C)soft D)sharp - ANSB OSHA requires an anti-fall line if a portable ladder or ___ is not used. A)shoring B)trench boxes C)stairs D)ropes - ANSC Place soil banks at least ___ feet from the excavation. A) B) C) D)1 - ANSC Pretreatment includes lake destratification, control of algae, debris removal, presedimentation, aeration, ___ and activated carbon adsorption. A)chemical oxidation B)filtration C)terminal disinfection D)backwashing - ANSA Private employers, such as contractors, must follow ___ excavation and trenching rules.

A)OSHA

B)AWWA

C)TNRCC (TCEQ)

D)EPA - ANSA

Public systems utilizing ground water serving less than ___ connections on purchase treated water only are not required to compile ___ reports. A)50, yearly B) 150, yearly C) 50, monthly D) 100, monthly - ANSD Public water systems are required to compile a monthly report showing... A)rate increases B)accidents C)dates of dead end flushing D)disciplinary action - ANSC Public water systems include cities, municipal utility districts, rural water supply corporations, mobile home parts, and ___. A)private wells B)campgrounds C)public pools D)public lakes - ANSB

Quality water has low amounts of color, turbidity, solids and ___. A)oxygen B)taste and odor C)hydrogen D)all listed - ANSB Repairing a leak under some pressure has an advantage of... A)interrupting service B)reducing contamination risk C)increasing air in the main D)ensuring the repair fails under service - ANSB Required notification by the water system to the TNRCC includes change or alteration of the system, a new facility to be built and water supply ___. A) rate increases B) health hazards C) bond elections D) bid proposals - ANSB Shoring is not necessary if the trench walls are sloped to the maximum allowable ___. A)slope B)recline D)dispose D)repose - ANSD

Shoring uses timbers or hydraulic wedges and ___. A)sheeting B)nails C)steel cables D)ropes - ANSA Sloping cuts trench walls to the angle that overcomes collapsing... A)soil B)spoil C)pressure D)tension - ANSC Small water systems often use ___ to disinfect their water supply. A)hydrochlorinators B)hypochlorinators C)hyperchlorinators D)hydrachlorinators - ANSB Sodium hypochlorite is a liquid ___. A)bleach B)sodium C)chlorine D)hydroxide - ANSA

Some regional and local agencies impacting the water utility industry are municipal utility districts, rural water supply corporations, drainage districts, ________, groundwater conservation districts, and subsidence districts. A)school districts B)postal distrcits C)real estate agencies D)river authorities - ANSD T/F: 50% of public water systems use surface water. - ANSFalse (True if 25%) T/F: A common filter is the slowsand filter, having several layers of different sized media. - ANSFalse (True if it was rapidsand) T/F: A confined space is 1)large enough to enter and do work, 2) has limited or restricted entry or exit), and 3)is not designed for continuous occupancy. - ANSTrue T/F: A filter must be whitewashed when a head loss of 6 to 10 ft occurs. - ANSFalse (True if it was backwashed instead of whitewashed) T/F: A public water system provides the public with piped water for human consumption, serves at least 15 service connections and regularly serves at least 25 individuals daily at least 60 days out of the year - ANSTrue T/F: A safety program must start from the bottom, then extend to the top official. - ANSFalse (True if it said it must start at the top then extend to the bottom official)

T/F: A standpipe is a tank resting on the ground that is greater in height than diameter. - ANSTrue T/F: Acute violations require public notification within 72 hours by radio and television using the words "Minor Health Concern". - ANSFalse T/F: After construction or maintenance of a storage tank a bacteriological sample must be taken after filling the tank. - ANSTrue T/F: After evaluation, confined spaces are designated "entry allowed" or "entry denied". - ANSFalse T/F: All public wells must be provided with a steel sealing block, a meter, a screened vent, and a sampling faucet. - ANSFalse (True if concrete instead steel) T/F: Aquifers are underground waterbearing formations yielding useful quantities of water. - ANSTrue T/F: Average water use depends on temperature, rainfall, cost, supply, economic level. - ANSTrue T/F: Before starting construction, the utility must submit engineering plans to the AWWA. - ANSFalse T/F: Before taking a bacteriological sample, flush the service line. - ANSTrue