TCEQ WATER OPERATOR LICENSE EXAM (CLASS C AND CLASS D EXAMS) | ALL QUESTIONS AND ANSWERS, Exams of Water Resources Planning and Management

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TCEQ WATER OPERATOR LICENSE EXAM (CLASS C

AND CLASS D EXAMS) | ALL QUESTIONS AND

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TCEQ CLASS C WATER OPERATOR LICENSE EXAM

Which of the following is an acceptable disinfection residual at the far reaches of the distribution System ---------CORRECT ANSWER----------------

• 0.2 mg/L free chlorine residual, 0.8 mg/L chloramine residual when using chloramine treatment, 0.5 mg/L chloramine for surface water supply, 0. 5 mg/L free chlorine residual for ground water Supply What is the approximate total volume of a circular tank in gallons, if it is 30 feet in diameter, and 15 feet deep ---------CORRECT ANSWER----------------
• 79,300 gallons You are using a chlorinator to provine a dosage of 4.0 mg/L. If the daily Water usage is 750,000 gallons, the gas chlorinator feed rate should be set at ____________ pounds per day. ---------CORRECT ANSWER--------------- -- 25 One gallon of water weighs - --------CORRECT ANSWER-----------------8. lbs. One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by ---------CORRECT ANSWER-----------------0.433 lbs. (1 ft. Water creates 0.433 psi of pressure)

A raw water intake structure may not be constructed with ___________ feet of a boat ramp, dock, or marina ---------CORRECT ANSWER-------------- ---1,000 feet Common types of pumps for use in water wells are ---------CORRECT ANSWER-----------------Vertical turbine and submersible _________ is the natural exchange of water between the earth and air ------ ---CORRECT ANSWER-----------------The hydraulic cycle If and when a health hazard contamination event occurs in a public water System, the operator must contact the state regulatory authority within __________ hours by telephone ---------CORRECT ANSWER----------------- 24 hours Potable water is that of ---------CORRECT ANSWER----------------- Maintained at adequate pressure, pathogen free, and contains a chlorine residual Excessive nitrates in drinking water can care a condition that affects infants under the age of 6 months, this condition known as ---------CORRECT ANSWER-----------------Blue baby In surface water treatment the process of causing the fine particles in water to join together to form larger heavier particles that settle in a clarifier is called ---------CORRECT ANSWER-----------------Coagulation

The test commonly used to determine the chemical dosage for the surface water plants is the _______ test ---------CORRECT ANSWER----------------- Jar Suspended solids are the solids portion that ---------CORRECT ANSWER--- --------------Cause mudballs and filter plugging A public Water system is required to take samples of water for bacteriological analysis. The organism that is used as an indicator is --------- CORRECT ANSWER-----------------Coliform Chisine dosage is demand plus desired ---------CORRECT ANSWER--------- --------Residual A storage vessel that is the same diameter from the ground to the top and is more than 20 feet but less than 80 feet tall is called a ---------CORRECT ANSWER-----------------Stand pipe Potable water must be stored at an elevation at least 80.85 feet above the highest known connection to provide the minimum operating pressure of _____ psi ---------CORRECT ANSWER----------------- 35 Water tank that uses compressed air over water to provide pressure is called a ---------CORRECT ANSWER-----------------Hydro pneumatic tank

According to the lead and copper rule, pipe and fittings may not contain more than __________ lead or solder and flux may not contain more than 0.2% lead ---------CORRECT ANSWER-----------------8.0% When testing for chlorine residual DPD is used as an indicator, when DPD is added to Water containing Chlorine what loser does the sample turn ------ ---CORRECT ANSWER-----------------Red Most commonly used valves for isolating a water leak is the --------- CORRECT ANSWER-----------------Gate valve In the distribution system when a valve or hydrant is opened or closed too fast it could result in a ---------CORRECT ANSWER-----------------Water hammer The most commonly used pump in the distribution system is --------- CORRECT ANSWER-----------------Centrifugal You are treating 21 MGD water in a surface Water plant, how many gallons per minute is this? ---------CORRECT ANSWER-----------------14,583 gallons per minute A class D certified Operator can operate a public water system up to _________ connections ---------CORRECT ANSWER----------------- 250

All state of Texas operator licenses after issue are good for _________ years ---------CORRECT ANSWER----------------- 3 After analyzing monthly bacteriological samples the operator is notified that one testing point, tested positive. The operator should- ---------CORRECT ANSWER-----------------Collect another sample at the site that tested positive plus one within 5 customers upstream and one within 5 customers downstream and re-submit Any excavation greater than _________ feet in depth requires the use of OSHA approved shoring equipment or sloping of walls to prevent cave - ins ---------CORRECT ANSWER-----------------5 feet If an operator discovers a Chlorine on a 150 lb. Cylinder inside a room he/she should immediately- ---------CORRECT ANSWER------------------ Call for assistance and wait

• put on self contained breathing apparatus and attach lifeline
• once assistance arrives- enter the room and shut off the valve on the cylinder and wait for exhaust fan to evacuate the chlorine from the room When an air gap is not practical, other acceptable back flow prevention devices are acceptable (depending on application. All of the following are acceptable in certain circumstances ---------CORRECT ANSWER-------------- ---- Atmospheric vacuum breaker
• pressure vacuum breaker
• testable double check valve assemblies
• reduced pressure zoning devices

If a new water main is installed and the total length of the new line is 6 miles now many bacteriological samples must be taken? ---------CORRECT ANSWER-----------------32 samples (4 per mile) In a cubic foot of water there are _______ gallons how many gallons are there in 9 cubic feet? ---------CORRECT ANSWER-----------------7.48 and

You are instructed to install 35 miles 6" water line the pipe comes in 20 ft lengths how many joints of pipe will you have installed once the job is complete ---------CORRECT ANSWER----------------- 924 A new subdivision is proposed for your Community the projected water use for the subdivision is 3.1mgd how many gallons per minute is that --------- CORRECT ANSWER-----------------2152 GPM You are the operator of a surface water treatment plant currently treating 4.3 MGD the required close of alum is 12 mg/L how many pounds of alum will you use ---------CORRECT ANSWER-----------------12910 Ibs Artisan wells are ---------CORRECT ANSWER-----------------Naturally occurring and free flowing Federal and state laws mandate bacteriological analysis of water supplies these samples must be obtained at least every ---------CORRECT ANSWER-----------------Month

The rate of speed at which water moves is ---------CORRECT ANSWER----- ------------Viscosity Unit of measure for water pressure ---------CORRECT ANSWER--------------- --Psi The purpose of a thrust block is ---------CORRECT ANSWER----------------- Prevent movement at pipe joints 4 common classes of working pressure in water main pipes are --------- CORRECT ANSWER-----------------100/150/200/ Volume equals length times width times height using this information if a container is 12 feet long, 4 wide and 6 feet high what is the volume --------- CORRECT ANSWER----------------- 88 AWWA recommends 5/8 x 3/4 service meter be tested every _______ years or _______ gallons of water ---------CORRECT ANSWER----------------

• 5 to 10 or 1,500, When pressure testing water mains the test pressure should be --------- CORRECT ANSWER-----------------1 1/2 times as great as the normal operating psi

Reported water main leaks should be repaired with in ---------CORRECT ANSWER-----------------24 hours Scale build up in pots and pans is cause a by ---------CORRECT ANSWER- ----------------Hard water An Operator installing a corporation stop would be placing this device at ---- -----CORRECT ANSWER-----------------On main line and service line attached The term pathogenic refers to, ---------CORRECT ANSWER----------------- Disease causing Calcium hypochlorite is comosive and may be flammable in the presence of ---------CORRECT ANSWER-----------------Petroleum or organic State Agency responsince for enforcing the safe drinking water act in Texas ---------CORRECT ANSWER-----------------Texas Commission on environmental Quality What minerals can cause water hardness ---------CORRECT ANSWER------ -----------Calcium and magnesium A public water system must at all times provide ---------CORRECT ANSWER-----------------Adequate quantity of water, pressure, and disinfection

A source groundwater would be ---------CORRECT ANSWER----------------- aquifer Fecal coliform organisms sometimes found in water supplies are an indication that ---------CORRECT ANSWER-----------------Water supply is contaminated, harmful bacteria may be present, possible pathogenic organisms in the water, water is unsuitable for drinking A disease that may be spread by inadequately disinfected water --------- CORRECT ANSWER-----------------Dysentery A common chemical used in disinfection of small water supply is --------- CORRECT ANSWER-----------------Calcium hypochlorite A physical connection between a potable water supply and house well would be ---------CORRECT ANSWER-----------------A cross connection The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called ---------CORRECT ANSWER----------------- Demand Which of the following is a physical characteristic of chlorine gas --------- CORRECT ANSWER-----------------Greenish-Yellow Color, heavier than air, pungent penetrating odor, corrosive

Which of the following would be considered a part of a hypo-chlorinator system ---------CORRECT ANSWER-----------------Solution feed pump According to state requirements, all public water Supply wells should be provided with a raised concrete sealing block, screened vents, and- --------- CORRECT ANSWER-----------------A flow measuring device Drawdown of a water well is determined by ---------CORRECT ANSWER---- -------------Difference in static and pumping levels pH of water indicates ---------CORRECT ANSWER-----------------If it's acidic or basic The pH of water is expressed on a pH scale of ---------CORRECT ANSWER----------------- 0 - 14 Water that is considered neutral is expressed on the pH scale at --------- CORRECT ANSWER-----------------7. Which of the following is a required Step in collecting a routine distribution sample for bacteriological testing? ---------CORRECT ANSWER----------------

• Use of an approved, sterile sample container

Sand filtration will remove which of the following from surface water --------- CORRECT ANSWER-----------------Turbidity Activated carbon is used in a surface water plant primarily for --------- CORRECT ANSWER-----------------Taste and odor control Which or the following chemicals are commonly used as coagulants in surface water treatment ---------CORRECT ANSWER-----------------Alum and ferric chloride Ground storage tanks are required to provided with which of the following -- -------CORRECT ANSWER-----------------Screened vents, an approved locking roof hatch, an overflow pipe with hinged flap device, annual inspection and maintenance as needed An elevated storage tank should be protected against corrosion by --------- CORRECT ANSWER-----------------Painting, cathodic protection, water stabilization, and only using galvanized and lead based primed components A public water supply system should maintain residual pressure of 20 psi and a minimum of normal operating pressure of ---------CORRECT ANSWER-----------------35 psi Before a new or repaired water line is placed into service, it must be properly disinfected by providing a chlorine dosage of _________ and proper detention time ---------CORRECT ANSWER-----------------50 mg/L

Water bearing formations beneath the earths surface that are used as a source of water for public water supplies are ---------CORRECT ANSWER-- ---------------Aquifers The purpose of an air line on a well is ---------CORRECT ANSWER----------- ------Determine Water leves in the well The mesh size is an important feature of a well screen because properly sized openings should ---------CORRECT ANSWER-----------------Reduce the amount of Sand pumped When treating surface Water, the process of coagularon will be most affected by the ---------CORRECT ANSWER-----------------pH, alkalinity, temperature, and chemical Dosage A rapid sand filter should be backwashed When ---------CORRECT ANSWER-----------------The loss of head gauge indicated between 6 and 10 feet Waterlines should be installed no closer than ___________ feet to any sewer lines or other possible contaminate lines ---------CORRECT ANSWER----------------- 9 At the base of an elevated storage tank a pressure gauge reads 72 psi how far above is the gauge is the water surface ---------CORRECT ANSWER----- ------------166 feet

How many gallons of water will a storage tank that is 978 cubic feet hold? -- -------CORRECT ANSWER-----------------7,315 gallons Calcium hypochlorite (HTH) is used as a disinfectant in small systems, what percentage chorine is this material typically? ---------CORRECT ANSWER-----------------65%-75% A certified operator doing their routine daily checks of wells, pumps, and storage facilities discovers a cut lock on the entry gate, there is also a cut lock on the roof hatch to the storage tank and suspicious looking containers lying on the ground that do not belong. What should the Operator do? ------- --CORRECT ANSWER------------------ Immediately notify TCEQ Regional office and they will notify law enforcement and investigate to determine if there is a danger or threat to public health and safety

• pull the electrical disconnect on the pumps and close valves isolating the tank until it can be analyzed When calculating area one will use the standard for pi what is the standard numerical value for pi? ---------CORRECT ANSWER-----------------3. Flushing dead-end mains - current state regulations require that all public water Systems flush dead-end mains to assure chlorine residual and water quality. What is the minimum flushing requirement? ---------CORRECT ANSWER-----------------Once every month In small systems liquid bleach is an approved method of disinfection, provided the product used meets basic industry standards. What is the

current standard bleach must meet in order to be approved for disinfection in a public water system? ---------CORRECT ANSWER-----------------Must conform to the national sanitation foundation (NSF) standard 60 The process of adding enough chlorine to a water supply to complete all reactions with reducing compounds, ammonia, and organic materials so that some free Chlorine is left called - ---------CORRECT ANSWER------------ -----Break point chlorine The primary reason for main line failures in the distribution system is - ------- --CORRECT ANSWER------------------ internal and external corrosion

• improper backfill and lack of proper bedding Check values on the discharge side of a pump are used to- --------- CORRECT ANSWER-----------------Prevent water from flowing back through the pump when the pump is off _____________ & ____________ acids are by products of drinking water - --------CORRECT ANSWER-----------------Trinalomethanes, Haloacetic These are ______ major underground water aquifers in Texas --------- CORRECT ANSWER----------------- 7 Most common type of filter in a surface plant is _________ and is designed to treat and flow at- ---------CORRECT ANSWER-----------------Rapid sand and designed to flow 2 gpm/ft

Proper backwashing of a sand filter is accomplished when the filter media expands by _________ % ---------CORRECT ANSWER----------------- 30 - 50 After disinfection and flushing of super chlorinated new lines and service but prior to placing the line into service, bacteriological samples are required. The current standard is _____________ sample for every __________ feet of line ---------CORRECT ANSWER-----------------One sample every 1.000 feet of line For cross connection control the TCEQ preferred method is - --------- CORRECT ANSWER-----------------Physical air gap One microorganism in Water that is resistant to Chlorine is- --------- CORRECT ANSWER-----------------Cryptosporidium All of the following are common types of water meters except --------- CORRECT ANSWER-----------------Inverted Parshall flume A boil-water notice can be triggered by- ---------CORRECT ANSWER--------- --------- Low distribution psi

• water outages
• repeated unacceptable bact samples
• failure to maintain good chlorine (Cl2) residual The maximum safe withdrawal rate of Chlorine for a 150 pound cylinder is- ---------CORRECT ANSWER-----------------40 lbs in 24 hours

When diluting a strong acid always add _______ to ________ rather than the reverse ---------CORRECT ANSWER-----------------Acid/Base Normal oxygen content in the atmosphere is _______% ---------CORRECT ANSWER-----------------20. Any atmosphere that is less than ________% oxygen should not be entered without an approved self-contained breathing apparatus --------- CORRECT ANSWER-----------------19. When chlorine gas is added to water, what compounds are formed? --------- CORRECT ANSWER-----------------Hydrochloric and hypochlorous acid The most important federal law that impacts the water utility industry is - ---- -----CORRECT ANSWER-----------------The safe drinking water act of 1974 An example of a non-community water system is ---------CORRECT ANSWER-----------------Rv Park, hotel/motel, Service station The EPA requires community water systems to provide customers with an annual- ---------CORRECT ANSWER-----------------Consumer confidence report

When designing systems engineers use a rule of thumb of _______ gallons per person per day when more accurate data isn't available --------- CORRECT ANSWER----------------- 130 TCEQ requires community water systems to have a minimum production capacity of _______ per connection at peak demand ---------CORRECT ANSWER-----------------0.6 gpm The most important treatment in water is- ---------CORRECT ANSWER------ -----------Disinfection Potable water means the water is ---------CORRECT ANSWER-----------------

• Safe for human consumption
• has a chlorine residual
• free of disease causing organisms TCEQ requires notification from the operator if changes to the public water system occur such as ---------CORRECT ANSWER-----------------Change in water source, water quality, or health hazards Public water systems in Texas are required to compile and maintain reports showing ---------CORRECT ANSWER------------------ Pumps and chemical usage
• date of dead-end flushing and storage tanks cleared
• microbial tests and chemical tests Physical characteristics of water include ---------CORRECT ANSWER-------- ---------Taste, odor, Color, turbidity, and temperature

Common gases found in water are hydrogen sulfide, Carbon dioxide, and methane. Hydrogen sulfide can be identified by its distinct smell, which is -- -------CORRECT ANSWER-----------------Rotten eggs and obnoxious Ground water is generally well filtered and free of turbidity, color, and organic. However it may be high in ---------CORRECT ANSWER--------------- --Minerals, gases, or corrosives Livestock and septic tanks must be no closer than ________ to a public well. ---------CORRECT ANSWER-----------------50 feet Underground fuel tanks and septic drainage fields most be at least _______ feet from a public well. ---------CORRECT ANSWER----------------- 150 feet Feedlots, sewage treatment plants and landfills must be at least ______ feet from a public well ---------CORRECT ANSWER----------------- 500 Trenches for laying 6 inch and larger pipe must be at least 18 inches and or ______ inches wider than the pipe diameter ---------CORRECT ANSWER--- -------------- 12 The top of a pipe in a trench must be at least ________ inches from the top of the ground ---------CORRECT ANSWER----------------- 24

In an excavation _______ feet or deeper a means of exit must be provided ---------CORRECT ANSWER----------------- 4 In an excavation if a ladder is used as a means of exit, it must extend _______ feet above the ground and be secured and within _______ feet laterally of anyone in the excavation. ---------CORRECT ANSWER------------- ----3 and 25 A groundwater system that serves in excess of 1,000 connections must have at least _______ operators with _______ license to meet minimum State requirements for public water systems ---------CORRECT ANSWER--- --------------2 and c A groundwater well is currently pumping 1,000 gallons per minute. Convert 1,000 gpm to million gallons per day (MGD) ---------CORRECT ANSWER--- --------------1.44 MGD It is desirable for pH of treated water to be above _______ otherwise _______ conditions will exist ---------CORRECT ANSWER-----------------7. and corrosive Fluorides are naturally occurring in some groundwater. Fluorides in drinking water should not exceed ---------CORRECT ANSWER-----------------4.0 mg/L Red water or red stains may be caused by _________ levels in water ------- --CORRECT ANSWER-----------------Iron

When chemicals are used at a water treatment plant a _______ day supply should be kept on hand at all times to comply with State standards --------- CORRECT ANSWER----------------- 30 The presence of iron in water is most commonly treated by --------- CORRECT ANSWER-----------------Aeration A common chemical oxidizer is ---------CORRECT ANSWER----------------- Potassium permanganate If groundwater is to be treated for several problems, the first process should be ---------CORRECT ANSWER-----------------Aeration Excess fluoride in water may be removed by ---------CORRECT ANSWER-- ---------------Activated alumina Trihalomethanes are formed by the reaction of _______ with organic chemicals ---------CORRECT ANSWER-----------------Free available Chlorine TCEQ requests a water system to have disinfection equipment capable of providing at least _______% greater capacity than the highest expected dosage at any time ---------CORRECT ANSWER----------------- 50

The rotometer on a gas chlorinator indicates the number of _______ of chlorine fed during a _______ period ---------CORRECT ANSWER------------ -----Pounds/24 hours A dosage of 4.0 mg/l is added to 750,000 gallons of water. How many pounds of chlorine are needed? ---------CORRECT ANSWER----------------- 25 pounds How many pounds of 70% Chlorine (HTH) will be needed to treat the same amount of water as 9.0 pounds of 100% chlorine? ---------CORRECT ANSWER-----------------12.85 pounds Using a ton cylinder, the maximum withdrawal rate should not exceed ------- --CORRECT ANSWER-----------------400 pounds The "pinging" sound or "rocks bouncing" sound coming is - from the bump typically indicates the pump ---------CORRECT ANSWER----------------- Cavitating A submersible pump and motor will be ---------CORRECT ANSWER---------- -------Suspended by pipe, placed near the bottom of the well The distance from the water level in the well to the centerline of a pump is - --------CORRECT ANSWER-----------------Static suction head

The distance of the water level in the well to the Water level in a storage tank is ---------CORRECT ANSWER-----------------Total static head The loss of energy which results from the movement of water through pipes and fittings is ---------CORRECT ANSWER-----------------Friction If a water lubricated vertical turbine pump is started by dry bearings --------- CORRECT ANSWER-----------------The bearings will be damaged Routinely measuring the static level and pumping level can --------- CORRECT ANSWER-----------------Detect problems with the pump, well screen, and/or water level The recommended capacities for ground storage is based on providing _______ to _______ hours of apply at _______ gallons per connection ----- ----CORRECT ANSWER-----------------4 to 6 hours at 200 gallons per connection Five codes require water main sizes in residential areas to be at least _______ when fire hydrants are attached ---------CORRECT ANSWER------- ----------6 inch Flow in pipes depends greatly on pipe diameter. Doubling the pipe diameter increases the carrying capacity by _______ times if friction is not considered ---------CORRECT ANSWER-----------------4 times

Unaccounted for water loss should be less than ________% of water production ---------CORRECT ANSWER----------------- 15 A critical factor affecting the useful life of service lines is the ability of the pipe material to resist internal and external ---------CORRECT ANSWER----- ------------Corrosion The results of bacteriological analysis shall be kept on file and available for _______ years ---------CORRECT ANSWER----------------- 5 A well pumped for 45 days. The beginning meter reading was 7,456,400 and 45 days later the same meter reading was 15,154,400. What was the average flow in gallons per day? ---------CORRECT ANSWER----------------- 171,066 One horsepower (1 hp) is equal to _______ feet pounds Of force per minute ---------CORRECT ANSWER-----------------33,000 feet pounds A groundwater well is currently producing 1.4 MGD. Calculate and convent 1.4 MGD to GPM ---------CORRECT ANSWER-----------------972 gpm Elevated storage is required for systems over _______connections --------- CORRECT ANSWER----------------- 750 Pressure vessels (tanks) are not recommended for systems over _______ connections ---------CORRECT ANSWER-----------------2,500

Altitude valves are used to control the level of Water in ---------CORRECT ANSWER-----------------Elevated storage tanks

TCEQ CLASS D WATER OPERATOR LICENSE EXAM

T/F: In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. ---------CORRECT ANSWER-----------------True Water covers approximately ________ of Earth's surface. --------- CORRECT ANSWER-----------------71% Drought is an extended period when a region receives a deficiency in its ________ water supply. ---------CORRECT ANSWER----------------- atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking ---------CORRECT ANSWER-----------------True Excluding outside water use, the average household uses about _______ gallons of water per month for inside use ---------CORRECT ANSWER------- ----------2,000

T/F: Only 3% of all the fresh water on earth can be easily accessed for use. ---------CORRECT ANSWER-----------------False (only 1%) T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the Safe Drinking Water Act from the EPA. ---------CORRECT ANSWER-----------------True T/F: PWS officials should be pro-active in their approach to terrorism. ------- --CORRECT ANSWER-----------------True _________ permits the owner of a well to pump as much water as desired, even if the water is drained from beneath the land of others. --------- CORRECT ANSWER-----------------Rule of Capture In Texas, agricultural water demand accounts for about ___% of the total water used. ---------CORRECT ANSWER-----------------57% T/F: An example of a non-transient non-community PWS is a rural school. - --------CORRECT ANSWER-----------------True Monitoring average and maximum daily water ______ enables us to plan ahead for growth. ---------CORRECT ANSWER-----------------Demand T/F: The Safe Drinking Water Act sets standards for drinking water including physical, chemical, bacteriological, and radiological characteristics. ---------CORRECT ANSWER-----------------True