TCEQ CLASS C WATER LICENSE EXAM, Exams of Nursing

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TCEQ CLASS C WATER LICENSE EXAM

2024 - 2025 WITH ACTUAL CORRECT

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Trenches for laying 6 inch and larger pipe must be at least 18 inches and or ______ inches wider than the pipe diameter 12 The top of a pipe in a trench must be at least ________ inches from the top of the ground 24 In an excavation _______ feet or deeper a means of exit must be provided 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. 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 2 and c

A groundwater well is currently pumping 1,000 gallons per minute. Convert 1,000 gpm to million gallons per day (MGD) 1.44 MGD It is desirable for pH of treated water to be above _______ otherwise _______ conditions will exist 7.0 and corrosive Fluorides are naturally occurring in some groundwater. Fluorides in drinking water should not exceed 4.0 mg/L Red water or red stains may be caused by _________ levels in water 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 30 The presence of iron in water is most commonly treated by Aeration A common chemical oxidizer is Potassium permanganate If groundwater is to be treated for several problems, the first process should be Aeration Excess fluoride in water may be removed by Activated alumina Trihalomethanes are formed by the reaction of _______ with organic chemicals 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 50

The rotometer on a gas chlorinator indicates the number of _______ of chlorine fed during a _______ period 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? 25 pounds How many pounds of 70% Chlorine (HTH) will be needed to treat the same amount of water as 9. pounds of 100% chlorine? 12.85 pounds Using a ton cylinder, the maximum withdrawal rate should not exceed 400 pounds The "pinging" sound or "rocks bouncing" sound coming is - from the bump typically indicates the pump Cavitating A submersible pump and motor will be 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 Static suction head The distance of the water level in the well to the Water level in a storage tank is Total static head The loss of energy which results from the movement of water through pipes and fittings is Friction If a water lubricated vertical turbine pump is started by dry bearings The bearings will be damaged

Routinely measuring the static level and pumping level can 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 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 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 4 times Unaccounted for water loss should be less than ________% of water production 15 A critical factor affecting the useful life of service lines is the ability of the pipe material to resist internal and external Corrosion The results of bacteriological analysis shall be kept on file and available for _______ years 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? 171, One horsepower (1 hp) is equal to _______ feet pounds Of force per minute 33,000 feet pounds A groundwater well is currently producing 1.4 MGD. Calculate and convent 1.4 MGD to GPM 972 gpm

Elevated storage is required for systems over _______connections 750 Pressure vessels (tanks) are not recommended for systems over _______ connections 2, Altitude valves are used to control the level of Water in Elevated storage tanks 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

• 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? 32 samples (4 per mile) In a cubic foot of water there are _______ gallons how many gallons are there in 9 cubic feet? 7.48 and 67. 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 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 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 12910 Ibs Artisan wells are Naturally occurring and free flowing

Federal and state laws mandate bacteriological analysis of water supplies these samples must be obtained at least every Month The rate of speed at which water moves is Viscosity Unit of measure for water pressure Psi The purpose of a thrust block is Prevent movement at pipe joints 4 common classes of working pressure in water main pipes are 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 88 AWWA recommends 5/8 x 3/4 service meter be tested every _______ years or _______ gallons of water 5 to 10 or 1,500, When pressure testing water mains the test pressure should be 1 1/2 times as great as the normal operating psi Reported water main leaks should be repaired with in 24 hours Scale build up in pots and pans is cause a by Hard water An Operator installing a corporation stop would be placing this device at On main line and service line attached The term pathogenic refers to, Disease causing Calcium hypochlorite is comosive and may be flammable in the presence of Petroleum or organic State Agency responsince for enforcing the safe drinking water act in Texas

Texas Commission on environmental Quality What minerals can cause water hardness Calcium and magnesium A public water system must at all times provide Adequate quantity of water, pressure, and disinfection A source groundwater would be aquifer Fecal coliform organisms sometimes found in water supplies are an indication that 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 Dysentery A common chemical used in disinfection of small water supply is Calcium hypochlorite A physical connection between a potable water supply and house well would be A cross connection The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called Demand Which of the following is a physical characteristic of chlorine gas Greenish-Yellow Color, heavier than air, pungent penetrating odor, corrosive Which of the following would be considered a part of a hypo-chlorinator system Solution feed pump According to state requirements, all public water Supply wells should be provided with a raised concrete sealing block, screened vents, and- A flow measuring device Drawdown of a water well is determined by Difference in static and pumping levels pH of water indicates If it's acidic or basic

The pH of water is expressed on a pH scale of 0 - 14 Water that is considered neutral is expressed on the pH scale at

Which of the following is a required Step in collecting a routine distribution sample for bacteriological testing? Use of an approved, sterile sample container Sand filtration will remove which of the following from surface water Turbidity Activated carbon is used in a surface water plant primarily for Taste and odor control Which or the following chemicals are commonly used as coagulants in surface water treatment Alum and ferric chloride Ground storage tanks are required to provided with which of the following 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 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 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 50 mg/L Water bearing formations beneath the earths surface that are used as a source of water for public water supplies are Aquifers The purpose of an air line on a well is Determine Water leves in the well The mesh size is an important feature of a well screen because properly sized openings should

Reduce the amount of Sand pumped When treating surface Water, the process of coagularon will be most affected by the pH, alkalinity, temperature, and chemical Dosage A rapid sand filter should be backwashed When The loss of head gauge indicated between 6 and 10 feet Which of the following is an acceptable disinfection residual at the far reaches of the distribution System 0.2 mg/L free chlorine residual, 0.8 mg/L chloramine residual when using chloramine treatment, 0. 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 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. 25 One gallon of water weighs 8.34 lbs. One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by 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 1,000 feet Common types of pumps for use in water wells are Vertical turbine and submersible

_________ is the natural exchange of water between the earth and air 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 24 hours Potable water is that of 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 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 Coagulation The test commonly used to determine the chemical dosage for the surface water plants is the _______ test Jar Suspended solids are the solids portion that 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 Coliform Chisine dosage is demand plus desired 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 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 35 Water tank that uses compressed air over water to provide pressure is called a 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 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 Red Most commonly used valves for isolating a water leak is the Gate valve In the distribution system when a valve or hydrant is opened or closed too fast it could result in a Water hammer The most commonly used pump in the distribution system is Centrifugal You are treating 21 MGD water in a surface Water plant, how many gallons per minute is this? 14,583 gallons per minute A class D certified Operator can operate a public water system up to _________ connections 250 All state of Texas operator licenses after issue are good for _________ years 3 After analyzing monthly bacteriological samples the operator is notified that one testing point, tested positive. The operator should- 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 5 feet If an operator discovers a Chlorine on a 150 lb. Cylinder inside a room he/she should immediately-

• 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 Waterlines should be installed no closer than ___________ feet to any sewer lines or other possible contaminate lines

At the base of an elevated storage tank a pressure gauge reads 72 psi how far above is the gauge is the water surface 166 feet How many gallons of water will a storage tank that is 978 cubic feet hold? 7,315 gallons Calcium hypochlorite (HTH) is used as a disinfectant in small systems, what percentage chorine is this material typically? 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?

• 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?

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? 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? 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 - Break point chlorine The primary reason for main line failures in the distribution system is -

• internal and external corrosion
• improper backfill and lack of proper bedding Check values on the discharge side of a pump are used to- Prevent water from flowing back through the pump when the pump is off _____________ & ____________ acids are by products of drinking water Trinalomethanes, Haloacetic These are ______ major underground water aquifers in Texas 7 Most common type of filter in a surface plant is _________ and is designed to treat and flow at- Rapid sand and designed to flow 2 gpm/ft Proper backwashing of a sand filter is accomplished when the filter media expands by _________ % 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 One sample every 1.000 feet of line For cross connection control the TCEQ preferred method is - Physical air gap One microorganism in Water that is resistant to Chlorine is- Cryptosporidium All of the following are common types of water meters except Inverted Parshall flume A boil-water notice can be triggered by-
• 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- 40 lbs in 24 hours When diluting a strong acid always add _______ to ________ rather than the reverse Acid/Base Normal oxygen content in the atmosphere is _______%

Any atmosphere that is less than ________% oxygen should not be entered without an approved self- contained breathing apparatus

When chlorine gas is added to water, what compounds are formed? Hydrochloric and hypochlorous acid The most important federal law that impacts the water utility industry is - The safe drinking water act of 1974 An example of a non-community water system is Rv Park, hotel/motel, Service station The EPA requires community water systems to provide customers with an annual- 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 130 TCEQ requires community water systems to have a minimum production capacity of _______ per connection at peak demand 0.6 gpm The most important treatment in water is- Disinfection Potable water means the water is

• 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

Change in water source, water quality, or health hazards Public water systems in Texas are required to compile and maintain reports showing

• Pumps and chemical usage
• date of dead-end flushing and storage tanks cleared
• microbial tests and chemical tests Physical characteristics of water include 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 Rotten eggs and obnoxious Ground water is generally well filtered and free of turbidity, color, and organic. However it may be high in Minerals, gases, or corrosives Livestock and septic tanks must be no closer than ________ to a public well. 50 feet Underground fuel tanks and septic drainage fields most be at least _______ feet from a public well. 150 feet Feedlots, sewage treatment plants and landfills must be at least ______ feet from a public well 500