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Download Class D Water Operator License Exam || TCEQ Questions with 100% Verified Solutions 2025/20 and more Exams Environmental Science in PDF only on Docsity!
Class D Water Operator License Exam || TCEQ Questions with 100% Verified Solutions 2025/2026 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 "Potable" means water is safe to drink and has a measurable chlorine oF Correct Answer Residual The plant operator is responsible for a sufficient supply of safe and drinking water. - Correct Answer Palatable T/F: The Texas State Board of Fire Insurance requires utilities that provide fire protection to have a minimum amount of water available based on 30 gals per person per day. - Correct Answer False (130 gals per person per day) T/F: The primary state regulator of water utilities is the TCEQ. - Correct Answer 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. - Correct Answer True Solids, water hardness, pH and gases are characteristics. - Correct Answer Chemical T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. - Correct Answer True T/F: The State recommends a water pH of less than 7 to be maintained at all time. - Correct Answer False (The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.) T/F: Taste and odor can come from organisms such as vegetation, bacteria, and algae, and from certain chemicals and metals. - Correct Answer True T/F: The deeper the well, the warmer the water. - Correct Answer True T/F: The threshold odor number (TON) relates to the number of dilutions needed for the water to be tasteless. - Correct Answer False (It reflects the number of dilutions needed for water sample to be *odorless*) One part per million or 1 mg/L means that for every pounds of water there is one pound of material in it. - Correct Answer 1 million The State requires filtered water to be equal to or less than turbidity units in at least 95% of the monthly samples. - Correct Answer 0.3 The State recommends a TON of ____ or less. - Correct Answer 3 T/F: The State recommends 20 color units or less for a quality water. - Correct Answer False (The state recommends 15 units of color or less for drinking water.) T/F: Examples of inorganic matter found in water include rock, sand, metals, and minerals. - Correct Answer True T/F: The red color caused by iron is an example of suspended or apparent color and it can be removed by filtration. - Correct Answer True Excessive calcium and are the primary cause of hardness in water. - Correct Answer Magnesium T/F: The State recommends a maximum total dissolved solids content of 500 mg/L - Correct Answer False (The state recommends that TDS not exceed 1000 mg/L) There are 3 common gases found in water: methane, carbon dioxide, and . - Correct Answer hydrogen sulfide T/F: Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection. - Correct Answer True T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. - Correct Answer False (flaming requires less contact time) T/F: The "primary limits" refer to chemicals with maximum contaminant levels that can be exceeded. - Correct Answer 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. - Correct Answer True T/F: Pathogens are disease-causing microorganisms. - Correct Answer True Repeat samples must be taken at (a) the (b) within 5 connections upstream and (c) within 5 connections downstream. - Correct Answer positive point T/F: If you do not fill out the submission form completely, you risk losing credit for the sample. - Correct Answer True T/F: The presence of fecal coliform in a water sample indicates fecal contamination from a human or warm-blooded animal. - Correct Answer 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. - Correct Answer active T/F: Keep the sample in ice or in a cooler prior to and during lab transport because heat stimulates bacterial growth. - Correct Answer True The action level for lead is mg/L and for copper it is me/L. - Correct Answer .015 / 1.3 T/F: Low doses of heavy metals such as lead and copper can cause damage to the central nervous system over time. - Correct Answer True A certain group of bacteria is used to indicate the possible presence of a pathogen--- the group. - Correct Answer Coliform Disinfection is the destruction of disease-causing microorganisms called -- Correct Answer Pathogens At room temperature chlorine is a greenish-yellow gas that is times heavier than air. - Correct Answer 2.5 The State requires to be kept in stock for disinfecting new water lines. - Correct Answer Calcium hypochlorite T/F: Hypochlorinators consist of a mixing tank and chemical solution feed pump. - Correct Answer 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. - Correct Answer 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. - Correct Answer True If chlorine enters the eyes, flush with running cool water for at least ____ minutes and seek medical attention. - Correct Answer 15 minutes Liquid bleach used in PWS must be approved. - Correct Answer NSF T/F: Primary components of a gas feed chlorinator include an injector, flowrate controller, rotameter, and mixing tank. - Correct Answer False (injector, vacuum regulator, flowrate controller, rotameter- *not a mixing tank*) The maximum sustained gas withdrawal rate for pressure transmission 150 Ib cylinders is Ibs/day - Correct Answer 40 T/F: TCEQ requires a faucet for raw water sampling on the discharge pipe of each PWS well. - Correct Answer True Permeability is the ability to water through the aquifer. - Correct Answer transmit T/F: The difference between the static level and pumping level is call the drawdown. - Correct Answer True Wells dug into artesian aquifers are considered wells. - Correct Answer deep The well screen prevents from entering the well. - Correct Answer sand T/F: Treatment of corrosive groundwater can be accomplished by adding alkalinity as lime or soda ash to adjust the pH. - Correct Answer True T/F: The line shaft turbine is driven by a motor located above the pump at ground level. - Correct Answer True T/F: Well casing supports the bore hole and helps protect the aquifer from contamination. - Correct Answer True T/F: The State requires a physical and chemical analysis of the water after 24 hours of pumping. - Correct Answer False (36 hours) T/F: Some artesian aquifer recharge areas (outcrop) are located many miles away from the well development site. - Correct Answer 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. - Correct Answer 3 Water in an aquifer is called water. - Correct Answer ground T/F: A sanitary control easement covering land within 1500 feet of a public well must be recorded in county courthouse records. - Correct Answer False (150 feet) The casing must extend at least inches above the floor of the pump room or ground surface. - Correct Answer 18 T/F: Aquifers sandwiched between impermeable layers of rock or clay are called confined aquifers or artesian aquifers. - Correct Answer True Three ways to measure water levels is the wetted tape, electric sounder, and the .- Correct Answer airline (most often used) A well drilled into a water table aquifer is usually a well. - Correct Answer Shallow Abandoned wells, not plugged, within ___ mile of a proposed well site must be reported to TCEQ. - Correct Answer 1/4 The State requires wells be protected by - fences or locked well houses. - Correct Answer Intruder-resistant Groundwater is usually clear and void of . - Correct Answer bacteria A restricted zone of ft radius from the raw water intake must be established and recreational activities and trespassing shall be prohibited. - Correct Answer 200 T/F: The Rio Grande River is the longest river in Texas, stretching 250 miles along the Mexico border. - Correct Answer False (1250 miles) T/F: Filtration is the first step in the removal of suspended solids. - Correct Answer False (Sedimentation) Surface water is usually low in and .- Correct Answer minerals / gases Chemical dosage, water temperature, pH, , and the characteristics of the raw water all have an effect on the coagulation process. - Correct Answer mixing The two pathogenic protozoans resistant to chlorination are: and - Correct Answer giardia / cryptosporidium T/F: Bacteria, algae, and turbidity can be a problem in surface water as can be municipal, industrial and agricultural pollution. - Correct Answer True T/F: Coagulation works by the bonding of negatively charged turbidity to positively charged chemical coagulants. - Correct Answer True T/F: Turbidity can shelter bacteria from the disinfection process. - Correct Answer True is the last treatment step before storage. - Correct Answer Disinfection T/F: Treated water is stored at the plant in a tank called a clear well. - Correct Answer True The process of separating floc from water by gravity is called: - Correct Answer sedimentation Filtration is the last barrier between the public and or . - Correct Answer giardia / cryptosporidium T/F: If the media collects in the wash water troughs, the wash rate is too high. - Correct Answer True T/F: A check valve located on the discharge side of a pump is an isolating valve that allows water to flow one direction only. - Correct Answer False (it is a *controlling valve*) T/F: The total dynamic head a pump must overcome is the distance from the water level on the suction side of the pump to the top of the water level on the discharge side of the pump and includes any friction and head loss encountered. - Correct Answer True Dead-end mains must be provided with - Correct Answer Flush valves T/F: Common cross connections include a garden hose connected to a potable water source and submerged in a stock tank, a home served by a city water supply and private well, and a chemical container connected to a potable water supply. - Correct Answer True T/F: lf a repaired main must be returned to service quickly, does with 50 mg/L for 30 minutes. - Correct Answer False (*500 mg/L*) The primary advantage of elevated storage is that pressure is when supply pumps are off or electrical power is lost. - Correct Answer maintained 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. - Correct Answer chlorination T/F: Methods of fighting corrosion include coatings, temperature adjustment, and cathodic protection. - Correct Answer False (pH adjustment, Orthophosphates, Poly- pigs) T/F: The most common design for residential service is the positive replacement meter. - Correct Answer False T/F: The curb stop connects the main service line and the corporation stop isolates the meter for repair or replacement - Correct Answer 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. - Correct Answer False To help safeguard against electrocution or machine injury, a safety program should have a policy. - Correct Answer lockout / tagout Install all from the top down and remove from the bottom up. - Correct Answer shoring T/F: Before digging, notify underground utilities. - Correct Answer True The Texas Hazard Communication Act requires employers to provide Safety Data Sheets (SDS) for hazardous used in the workplace. - Correct Answer chemicals T/F: Barricade stripes must slope downward at 30 degrees in the direction the traffic is to pass. - Correct Answer False (45 degrees) T/F: Training in the hazardous chemicals must be taken only once a year. - Correct Answer False The STOP/SLOW paddle should be the traffic control device. - Correct Answer primary T/F: Flashing lights must be yellow and are excellent for attracting a driver's attention toward a potential hazard. - Correct Answer 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. - Correct Answer True The State allows utility works to use control devices at work sites provided the devices conform to current manual criteria. - Correct Answer traffic Generally, signs should be located on the right-hand side of the road and mounted on supports, posts, or - Correct Answer barricades The least stable soil type is - Correct Answer Type C A good safety program should have management leadership, employee participation, hazard identification, training, and . - Correct Answer equipment 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 - Correct Answer 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)O-7 b) 0-14 c)1-7 d) 1-14 e) none of the above - Correct Answer b) 0 - 14 Before a new main is placed into service, it must be properly disinfected with a minimum chlorine dosage of: a) 50 mg/L b) 30 mg/L c) 40 mg/L d) 75 mg/L e) 25 mg/L - Correct Answer a) 50 mg/L A common chemical used for disinfecting a small public water supply is: a) soda ash b) copper sulfate c) sodium hypochlorite d) fluoride e) sodium chloride - Correct Answer c) sodium hypochlorite Gravity filters will remove which of the following from surface water supplies: a) turbidity b) taste and odors c) nitrates d) hardness e) chlorides - Correct Answer a) turbidity If you added 3.5 mg/L of chlorine to your storage tank and 30 minutes later measured the residual at 1.2 mg/L, what was the chlorine demand in the tank? a) 4.2 b) 2.9 c) 0.3 d) 2.3 e) 4.7 - Correct Answer d) 2.3 Your ground storage tank is 15 feet high and 30 feet in diameter. About how much water can it hold? a) 31,700 gallons b) 79,270 gallons c) 50, 490 gallons d) 25,150 gallons e) 10,600 gallons - Correct Answer ... 
