Download TCEQ Class C Water License Exam Questions and Answers and more Exams Water and Wastewater Engineering in PDF only on Docsity!
TCEQ class c water license exam| Answered
with Guaranteed Success| 2025- 2026
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
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, 0.5 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 79,300 gallons
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
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 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 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?
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
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
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, 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
