Texas Class D Water Test Questions and Answers Rated A

Texas Class D Water Test Questions and Answers Rated A Who is authorized to remove a lock and tag placed on a piece of equipment to isolate it for maintenance? Only the person who placed the lock and tag In addition of an emergency residual pressure of 20 psi, what is the minimum normal operating pressure a public water supply system should maintain? 35 psi What is the minimum distance separating installed water mains from any sewer lines or other possible contaminated lines? 9 feet What is the minimum distance required to separate grazing livestock and septic tanks from a public well? 50 feet What color does the sample turn when the DPD reagent is added to water containing chlorine? Red A system is operating at a flow rate of 2.2 MGD. A chlorine dose of 10 mg/L is required to maintain a disinfectant residual of 0.4 mg/L. Calculate the daily chlorine demand in pounds. 176 pounds A tank with 1 foot of water above a pressure gauge at the bottom will register a reading of: 0.433 psi Pipe and fittings used in public water systems may not contain more than ____% lead or solder and flux may not contain more than ____% lead. 0.25%, 0.2% Chlorine tablets (Calcium hypochlorite) should not come in contact with ________ based products due to the violent reaction that will result. Petroleum What is the condition called which affects young children and is caused by high nitrate levels in drinking water? (choose all that apply) How much does one gallon of water weigh? 8.34 lbs How many hours does the system operator have to contact the state regulatory authority by phone if a contamination event occurs in a public water system at 8:00 Monday morning and the administrative office closes at 4:00 p.m.? After disinfecting a newly installed water main, bacteriological samples are required to be collected every ____ feet along the new line. 1,000 For water to be considered Potable, it: (choose all that apply): Contains a chlorine residual, Is free of pathogens, Coliform free Which choice(s) below is/are sources of groundwater? (choose all that apply) Aquifer Which waterborne diseases below may be spread by water that has not been properly disinfected? (choose all that apply) Typhoid, hepatis, dysentery, crypto, cholera. A Texas Class D Water Operator cannot renew his license if he operates a groundwater treatment system with _____ service connections. 250 What is the purpose of installing a check valve on the discharge side of a centrifugal pump? Prevent damage to the pump motor when not in operation What reports/records are Texas Public Water Systems required to create and maintain on-site? All of the above - Storage cleaning, water volume pumped chemicals used, dead ends flushed. What is the minimum production capacity per service connection at peak demand required by the TCEQ for community water systems? Where should the chlorine scrubber intake vents be located in a chlorine cylinder storage room? Near the floor since chlorine is about 2.5 time heavier than air What do water operators call the amount of chlorine that is used up by reacting with iron, organics, bacteria, or other impurities? Chlorine Demand What operator action is required when a public water supply system's distribution system drop below 20 psi? (choose all that apply) Notify the Regional TCEQ Office, Correct the cause of the low pressure condition, Issue a "Boil Water Notice" Where are curb stop valves found in the distribution system? On the water system's side of a water meter Information concerning chemicals in the workplace should be available to employees in the form of a: Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) What is the minimum flushing requirement when flushing dead-end mains to make sure proper chlorine residual and water quality is maintained? Monthly Where is a Corporation Stop found in the distribution system? Tapped into the water main What is the major federal law affecting the water utility industry? The Safe Drinking Water Act of 1974 What is the natural exchange of water between the earth and atmosphere called? Hydrologic Cycle What is the most common isolation valve installed in a water distribution system? Gate valve What causes red water or red stains on clothes and plumbing fixtures? Oxidized Iron A connection between a private well used for drinking water and a public water supply is: A Cross Connection What does the sound of "pumping gravel" coming from a pump indicate? Cavitation What state agency has the authority to enforce the Safe Drinking Water Act in Texas? Texas Commission on Environmental Quality (TCEQ) What does the pH of water tell the operator? (choose all that apply) whether it is basic or acidic Water systems use pumps and elevated storage tanks to maintain system pressure. What type of pump is most commonly used for this purpose in the distribution system? Centrifugal pump How many feet of water is in a storage tank if a gauge at the bottom reads 80 psi? 184.8 feet A well was drilled 300 feet deep and has a 1.5-foot casing. The static level of water in the well is 100 feet and the pumping level is 170 feet. The flow from the well is 350 gpm. What is the drawdown? 70 feet What does it mean if fecal coliform is found in a water supply? (Choose all that apply) Pathogenic organisms may be in the water The water is contaminated The water is not potable Waterborne disease outbreak is possible Harmful bacteria might be in the water Gloves, face shields, hearing protection, hard hats, and safety glasses are all examples of: Personal Protective Equipment (PPE) From the choices below, select a microorganism that is resistant to chlorine disinfection. What chlorine dosage is required to disinfect a new or repaired water line under normal circumstances? 50 mg/L In a conventional surface water treatment plant, the disinfection process is normally located: Last Which chemical below is most likely to be used by a small water system for disinfection? Calcium Hypochlorite Calculate the volume in gallons of a circular tank, if it is 125.6 feet in circumference, and is 25 feet deep. 234,872 If you know the static and pumping water levels in the well, you should be able to determine the: Drawdown Total Hardness as a water quality parameter is the measurement of: Calcium and Magnesium What method is commonly used by treatment plant operators to determine the proper coagulation dose? Jar test What does TCEQ say is the preferred method(s) for Cross Connection Control? Air Gap What is the typical percentage of available free chlorine in Calcium Hypochlorite (HTH)? How long after issue are all state of Texas Operator License's valid? 3 years Which of the below options are types of pumps used in deep water wells? (choose all that apply) Vertical Turbine pump Submersible pump What is/are the primary cause(s) of water main pipe failures in a distribution system? (choose all that apply) Water systems that don't have adequate elevated storage may use a water tank with compressed air in it to help maintain pressure during periods of high demand. What is this type of system called? Hydropneumatic tank Your system is installing 5 miles of new water main. Each section of pipe is 20 feet long. How many pieces of pipe will you need? Select the equipment that may be used to determine the drawdown of a water well. Air line OSHA approved shoring is required to prevent trench cave-in when the trench is ____ feet or deeper. 5 feet or deeper When collecting a sample for coliform testing, which of the following is required? (choose all that apply) From the choices below, select the component(s) that make up a hypochlorinator feed system. The chemical feed pump. What is the minimum distance required to separate feedlots, sewage treatment plants and landfills from a public well? 500 ft. What is the minimum acceptable disinfection residual at all points of the distribution system? (choose all that apply) The purpose of a safety program in the workplace is to: Prevent Accidents Groundwater is usually lower than surface water in turbidity, but higher in: (choose all that apply) hardness, minerals and inorganics. A poisonous gas that smells like rotten eggs is: Hydrogen Sulfide The required chlorine dose can be determined by adding the system chlorine demand to the desired chlorine: chlorine residual What is the purpose of the well screen on a water well? Keep sand out of the well and pump. Water is considered to be neutral (neither basic or acidic) when it has a pH of: 7 What do water treatment operators call it when they add enough chlorine to a water supply to react with all reducing compounds, ammonia, and other impurities to create a free chlorine residual? BREAK POINT CHLORINATION What document does the EPA require community water systems to provide to their customers by July first of each year? Consumer Confidence Report (CCR) What must a public water system provide to its customers at all times? (choose all that apply) Adequate water pressure, water disinfection, water quantity. Which of the choices below is an example of a Transient, Non-community Water System? What is the purpose of a lockout/tagout program? To keep employees safe by isolating potential energy sources from equipment during maintenance From the list below, choose what is considered to be the most important water treatment process? Disinfection What organism (bacteria group) is used as an indicator in public water systems during bacteriological testing? Coliform What condition could occur in the distribution system when a valve is opened or closed too fast? Water Hammer The coagulation process can best be described as: change neutralization Most of the suspended solids are removed during the ________ process following coagulation and flocculation. sedimentation process How many gallons per minute (gpm) is 3.1 MGD? 2153 gpm An operator calculated that it would require 10 pounds of chlorine gas to disinfect a water storage tank. How many pounds of calcium hypochlorite (HTH) with an available free chlorine content of 65% will be needed to disinfect this tank? A water system collecting more than one bacteriological sample each month that has one positive sample result for coliform must collect ____ repeat samples within ____ hours of being notified of the positive result. 3 repeat samples within 24 hours Chlorine leaks around cylinder connections can be detected by using a ____% ammonium hydroxide solution. 10% Solids that make it through the sedimentation process of a conventional surface water treatment plant are removed during the ______ process. filtration In addition to a raised concrete sealing block and screened vents, all public water supply wells in Texas shall be provided with the following: Drawdown Gauge. Convert 1,667 (gpm) to million gallons per day (MGD) A rural water system has a water storage tank that sits on the ground. It has a diameter of 25 feet and is 80 feet tall. What type of storage tank is this? When collecting a sample for BACT, which of the following is required? USE of a sterile sample container.