Class D Water Operator License Exam TCEQ Questions & Answers 2024/2025, Exams of Water Resources Planning and Management

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T/F: In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. - ANS- Vv True Water covers approximately of Earth's surface. - ANS-4 471% Drought is an extended period when a region receives a deficiency in its water supply. - ANS- V v atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking - ANS-W ¥ True Excluding outside water use, the average household uses about gallons of water per month for inside use - ANS- 2,000 T/F: Only 3% of all the fresh water on earth can be easily accessed for use. - ANS-V “False (only 1%) T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the Safe Drinking Water Act from the EPA. - ANS- / True T/F: PWS officials should be pro-active in their approach to terrorism. - ANS-/ “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. - ANS-¥ “Rule of Capture In Texas, agricultural water demand accounts for about __% of the total water used. - ANS-4 57% T/F: An example of a non-transient non-community PWS is a rural school. - ANS- “True Monitoring average and maximum daily water enables us to plan ahead for growth. - ANS-“”” Demand T/F: The Safe Drinking Water Act sets standards for drinking water including physical, chemical, bacteriological, and radiological characteristics. - ANS-V / True "Potable" means water is safe to drink and has a measurable chlorine .-ANS-/ ¥ Residual The plant operator is responsible for a sufficient supply of safe and drinking water. - ANS-/ 4 Palatable T/F: The Texas State Board of Fire Insurance requires utilities that provide fire protection to havea minimum amount of water available based on 30 gals per person per day. - ANS-/ / False (130 gals per person per day) T/F: The primary state regulator of water utilities is the TCEQ. - ANS-Y “True T/F: All community and non-transient non-community PWS, regardless of source of water, must be under the supervision of a licensed water works operator. - ANS-/ / True Meter readers bring in operating revenue and profoundly impact relations. - ANS- “Public The federal regulator of drinking water is the .- ANS-4 A EPA T/F: Duties of distribution operator include repairing leaks, making taps, flushing mains, and taking radiological samples. - ANS-/ False (Repair leaks, Make taps, Flush mains, Operate pumps, Take *bacteriological* samples) T/F: The State recommends a maximum total dissolved solids content of 500 mg/L - ANS-W ¥ False (The state recommends that TDS not exceed 1000 mg/L) There are 3 common gases found in water: methane, carbon dioxide, and A ANS-V v hydrogen sulfide T/F: Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection. - ANS-V ¥ True T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. - ANS-V ¥ False (flaming requires less contact time) T/F: The "primary limits" refer to chemicals with maximum contaminant levels that can be exceeded. - ANS-v ¥ False (refers to chemicals with maximum contaminant levels (MCLs) that *CANNOT* be exceeded.) T/F: The term "total coliform" means fecal and non-fecal coliform. - ANS-W “True T/F: Pathogens are disease-causing microorganisms. - ANS-” “True If aroutine sample is positive, flush the positive sample point, check the chlorine residual, then resample within 24 days of notification. - ANS-W False (If a routine sample is total coliform-positive, the PWS should flush the positive sample point, check the chlorine residual, then resample within *24 hrs* of notification) To prevent the formation of THMS in surface water, chlorine is combined with forming chloramine, combined chlorine residual. - ANS-~ “ Ammonia If there is no chlorine at a faucet, do not sample, flush longer. - ANS-V W residual T/F: All repeat samples must be collected on successive days. - ANS-¥ ¥ False (Collect all repeat sample on the same day) In the event of distribution pressure below __ psi, outages, repeated bad samples or chlorine below minimum, special precautions must be instituted. - ANS- ¥ 20/water/residual Get the sample to the lab within or it will be rejected. - ANS- #30 hours (for BacT samples) At 0.8 - 1.0 mg/L, fluoride reduces dental cavities, but in higher doeses (>2.0 mg/L) can cause of teeth over time. - ANS-V ¥ mottling T/F: One by-product of chlorinated drinking water is trihalomethane, a suspected carcinogen. - ANS-¥ V True Repeat samples must be taken at (a) the _ (b) within 5 connections upstream and (c) within 5 connections downstream. - ANS- ¥ positive point T/F: If you do not fill out the submission form completely, you risk losing credit for the sample. - ANS-¥ V True T/F: The presence of fecal coliform in a water sample indicates fecal contamination from a human or warm-blooded animal. - ANS-V “True The purpose of the sample site plan is to assure bacteriological samples are collected from service connections which are representative of the distribution system. - ANS-W ¥ active T/F: Keep the sample in ice or in a cooler prior to and during lab transport because heat stimulates bacterial growth. - ANS-¥ / True The action level for lead is mg/L and for copper it is mg/L. - ANS-¥ 4.015 /13 T/F: Low doses of heavy metals such as lead and copper can cause damage to the central nervous system over time. - ANS-/ / True A certain group of bacteria is used to indicate the possible presence of a pathogen--- the group. - ANS-/ / Coliform Disinfection is the destruction of disease-causing microorganisms called . - ANS-W ¥ Pathogens At room temperature chlorine is a greenish-yellow gas that is__ times heavier than air. - ANS-VW2.5 The State requires to be kept in stock for disinfecting new water lines. - ANS- “ Calcium hypochlorite T/F: Hypochlorinators consist of a mixing tank and chemical solution feed pump. - ANS-¥ / True A full-face self-contained breathing apparatus or supplied air respirator must be readily accessible outside the fire station when chlorine gas is used. - ANS-W False (A full-face self-contained breathing apparatus (SCBA) or supplied air respirator that meets OSHA standards shall be readily accessible outside the *chlorinator room* when chlorine gas is used.) T/F: All public water systems must have chlorination facilities. - ANS-/ “True T/F: The line shaft turbine is driven by a motor located above the pump at ground level. - ANS-V W True T/F: Well casing supports the bore hole and helps protect the aquifer from contamination. - ANS-V ¥ True T/F: The State requires a physical and chemical analysis of the water after 24 hours of pumping. - ANS-¥ ¥ False (36 hours) T/F: Some artesian aquifer recharge areas (outcrop) are located many miles away from the well development site. - ANS-V / True (Artesian Wells can be recharged from many miles away) A BacT sample, taken from a newly constructed well, on consecutive days, must show negative results. - ANS-/ #3 Water in an aquifer is called water. - ANS-/ Y ground T/F: A sanitary control easement covering land within 1500 feet of a public well must be recorded in county courthouse records. - ANS- False (150 feet) The casing must extend at least inches above the floor of the pump room or ground surface. - ANS- vv18 T/F: Aquifers sandwiched between impermeable layers of rock or clay are called confined aquifers or artesian aquifers. - ANS-/ / True Three ways to measure water levels is the wetted tape, electric sounder, and the .- ANS-4/ 4% airline (most often used) A well drilled into a water table aquifer is usually a well. - ANS-/ “Shallow Abandoned wells, not plugged, within __ mile of a proposed well site must be reported to TCEQ, - ANS- vvi1/4 The State requires wells be protected by - fences or locked well houses. - ANS-/ / Intruder-resistant Groundwater is usually clear and void of .- ANS-v ¥ bacteria TCEQ defines "complete treatment" as the following sequence of processes: pretreatment disinfection, taste and odor control, continuous coagulation, filtration, sedimentation, terminal disinfection, and covered storage. - ANS-W ¥ False (1. Pretreatment disinfection 2. Taste and odor control 3. Continuous coagulation *4, Sedimentation* *5. Filtration* 6. Terminal disinfection 7. Covered storage) T/F: Most solids should be removed in the filtration step. - ANS- / False (Sedimentation) T/F: TCEQ requires filtered water to be 0.3 NTUs or less in at least 95% of measurements each month. - ANS-V / True Destratification is the mixing of lake water by compressed air to prevent layers of different from developing. - ANS-V / temperature All PWS in Texas are required to use as the final disinfectant. - ANS- ¥ chlorine T/F: Powdered activated carbon (PAC) is commonly used to treat iron and manganese. - ANS-V ¥ False (removes the tastes and odors usually caused by dead and decaying *algae* and vegetation) A restricted zone of ft radius from the raw water intake must be established and recreational activities and trespassing shall be prohibited. - ANS-V #200 T/F: The Rio Grande River is the longest river in Texas, stretching 250 miles along the Mexico border. - ANS-¥ ¥ False (1250 miles) T/F: Filtration is the first step in the removal of suspended solids. - ANS-/ ¥ False (Sedimentation) Surface water is usually low in and . - ANS-V ¥ minerals / gases Chemical dosage, water temperature, pH, and the characteristics of the raw water all have an effect on the coagulation process. - ANS-V Y mixing The two pathogenic protozoans resistant to chlorination are: and -ANS-/ 4 giardia / cryptosporidium T/F: Bacteria, algae, and turbidity can be a problem in surface water as can be municipal, industrial and agricultural pollution. - ANS-V / True T/F: Coagulation works by the bonding of negatively charged turbidity to positively charged chemical coagulants. - ANS-/W “True Stored water can meet sudden demands such as fire, absorb pressure surges, provide detention/contact time for and allow for expansion of the distribution system. - ANS-/ & chlorination T/F: Methods of fighting corrosion include coatings, temperature adjustment, and cathodic protection. - ANS-¥ False (pH adjustment, Orthophosphates, Poly-pigs) T/F: The most common design for residential service is the positive replacement meter. - ANS-/ / False T/F: The curb stop connects the main service line and the corporation stop isolates the meter for repair or replacement - ANS-~ /False (The *corporation stop* connects to the city main and the *curb stop* is used to isolate the meter for repair) T/F: Close a fire hydrant slowly or a water log could occur. - ANS-V / False To help safeguard against electrocution or machine injury, a safety program should have a___ policy. - ANS-V “lockout / tagout Install all from the top down and remove from the bottom up. - ANS-¥ “shoring T/F: Before digging, notify underground utilities. - ANS-Y “True The Texas Hazard Communication Act requires employers to provide Safety Data Sheets (SDS) for hazardous used in the workplace. - ANS-/ ¥ chemicals T/F: Barricade stripes must slope downward at 30 degrees in the direction the traffic is to pass. - ANS-¥ V False (45 degrees) T/F: Training in the hazardous chemicals must be taken only once a year. - ANS-/ ¥ False The STOP/SLOW paddle should be the traffic control device. - ANS-/ ¥ primary T/F: Flashing lights must be yellow and are excellent for attracting a driver's attention toward a potential hazard. - ANS-/ “True T/F: A confined space entry program should identify confined spaces, establish a permit system, train personnel, provide safety equipment and develop rescue procedures. - ANS-¥ “True The State allows utility works to use control devices at work sites provided the devices conform to current manual criteria. - ANS-V traffic Generally, signs should be located on the right-hand side of the road and mounted on supports, posts, or - ANS-V W barricades The least stable soil type is - ANS-¥ / Type C A good safety program should have management leadership, employee participation, hazard identification, training, and .- ANS-W Y equipment T/F: A competent person should inspect the cave-in protection at least daily. - ANS-V Y True T/F: The Texas Hazard Communication Act is known as the "Right to Risk Law" - ANS-/ ¥ False ("Right to Know") A confined space entry team consists of a supervisor, an attendant, and an authorized . ANS- entrant Oxygen deficiency is considered to be less than % oxygen. - ANS-¥ / 19.5 T/F: Limit flag use to emergency situations and at locations controlled by a single flagger. - AN-VY True The spoil should be placed no closer than ____ ft from the edge of the excavation. - ANS-/ #2 ft For day or night work, a flagger's clothing can be blue or brown. - ANS-/ / False Which of the following is part of a hypochlorination system? a) solution feed pump b) gas cylinder c) rotameter d) injector/ejector e) all of the above - ANS-¥ Ya) solution feed pump An elevated storage tank should be protected against corrosion by: a) painting b) cathodic protection c) water stabilization d) all of the above e) galvanizing - ANS-/ &/ d) all of the above (painting, cathodic protection, and water stabilization) The pH of water indicates whether it is acidic or basic and is expressed by a scale of numbers ranging from: a) 0.2 mg/L of free chlorine for a small GWS b) 0.5 mg/L of chloramine for a large SWS c) 1.0 mg/L of combined when using ammoniation facilities d) 1.0 mg/L of total for a large SWS e) all of the above - ANS-¥ /e) all of the above The purpose of an air line on a well is to: a) aerate the well b) determine the depth of the aquifer ¢) inject chlorine into the well d) allow the well to breathe e) determine the water level - ANS- “/ e) determine the water level The drawdown of a well is determined by: a) a properly installed air line b) the difference between the static and pumping level c) a psi gage calibrated in feet of water d) a tape measure e) an electronic sounder - ANS-W b) the difference between the static and pumping level A common type of oxidant that is used at most SW treatment plants to kill bacteria and to prevent trihalomethane formation is: a) total chlorine b) combined chlorine c) chlorine dioxide d) free chlorine e) ozonation - ANS-¥ ¥ b) combined chlorine A PWS is responsible for providing: a) potable water b) adequate water pressure c) an adequate quantity of water d) all of the above e) soft water - ANS-/ ¢d) all of the above The amount of chlorine in mg/L that is used up by reactions with organics and inorganics is called: a) dosage b) demand c) total chlorine d) residual e) free chlorine - ANS-Y Wb) demand A potable water supply: a) is free of pathogenic organisms b) has an adequate chlorine residual c) contains a safe level of chemicals d) all of the above e) is found only in community type water systems - ANS-/ / d) all of the above According to state rules, all PWS wells must be provided with concrete sealing slabs, screened casing vents, raw water sampling taps and: a) liquid level indicators b) surge suppressors c) flow measuring devices d) fluoridation injection equipment e) pressure gauges - ANS- c) flow measuring devices