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TEXAS WASTEWATER CLASS D EXAM ACTUAL EXAM ALL
400 EXAM QUESTIONS AND ANSWERS JUST RELEASED
TEXAS WASTEWATER CLASS D
In small water systems the operator is often _____, _____ and _____. - ANSWER-meter reader, repair crew and pump operator "Stuffers" sent to customers in billing statements may contain ________. a. departments to call for service b. explanations of utility policy c. a history of the utility d. tips on water conservation e. all the above - ANSWER-e. all of the above Delinquent payment notices should be ________. a. tactful and tasteful b. mailed in an envelope c. businesslike
d. all listed - ANSWER-d. all listed Chemically, water is made of ________. - ANSWER-2 atoms of hydrogen and 1 atom of oxygen The hydrologic cycle is ________. a. nature's way of recycling water b. equipment used to measure distances c. the way water filters through the earth d. the process by which water runs into rivers and lakes - ANSWER-a. nature's way of recycling water The quality standard for public water supplies is based on the use of water for ________. - ANSWER-drinking One of the most important purposes of a public water supply is _______. a. swimming b. landscape watering c. car washing d. firefighting - ANSWER-d. firefighting
standards. (true/false) - ANSWER-true EPA requires community water systems to provide customers with a ________ report on the system's water quality. - ANSWER-yearly If water quality reports are attractive and easy to ________, they can build goodwill and trust with the customer. - ANSWER-understand Good treatment of employees includes fair wages, benefits, and ________ working conditions. - ANSWER-safe working conditions Follow up with a phone call or ________ to make sure everything is satisfactory. a. postcard b. email c. letter d. a and b - ANSWER-d. postcard or email
Listen to special requests and seek solutions to oblige the customer within ________. - ANSWER-utility policy Treat customers as though another water utility across the street is competing for your ________. - ANSWER-customers The molecular formula for water is _____. - ANSWER-H2O Water occurs in three forms: solid ice, liquid water, and water vapor. (true/false) - ANSWER-true The _____ is the natural exchange of water between the earth and the atmosphere. - ANSWER- hydrologic cycle Average water use depends on temperature, rainfall, cost, supply, and economic level. (true/false) - ANSWER-true Groundwater is located above the earth's surface and tapped by wells. (true/false) - ANSWER- false (groundwater is below the surface)
Water is always found pure in nature. (true/false) - ANSWER-false Physical characteristics of water are temperature, turbidity, color, taste, odor, and pH. (true/false) - ANSWER-false (pH is a chemical characteristic) _____ is the amount of suspended matter such as clay, silt, organic matter, and microorganisms in the water. - ANSWER-Turbidity Color in water can result from _____ or _____. - ANSWER-mineral or organic matter True color is dissolved in water (in solution) and can be removed by filtration. (true/false) - ANSWER-false Red water caused by oxidized iron is in suspension (apparent color) and cannot be removed by filtering. (true/false) - ANSWER-false Taste and odor comes from algae, bacteria, organic matter, gases, and chemicals. (true/false) - ANSWER-true
Surface water supplies should be sampled for chemical analysis every year and groundwater supplies should be sampled _____. - ANSWER-every 3 years _____ and _____ and other minerals cause hardness in water. - ANSWER-Calcium and magnesium The pH scale ranges from _____ to _____. - ANSWER-0 to 14 A pH of _____ is neutral. - ANSWER-7 is neutral Common gases found in water include hydrogen sulfide, carbon dioxide, methane, and sodium chloride. (true/false) - ANSWER-false (sodium chloride is table salt) Water must be disinfected, delivered at inadequate pressure, and be ample in quantity. (true/false) - ANSWER-false (adequate pressure) Utility employees should guard the water supply and facilities from contamination, public tours, and even terrorism. (true/false) - ANSWER-false (public tours) The state requires bacteriological sample results be kept _____ years. - ANSWER-5 years
All public water systems are required to employ licensed operators even if the system only _____ treated water bought from another source. - ANSWER-redistributes treated water Public water systems include cities, municipal utility districts, rural water supply corporations, mobile home parks, and _____. - ANSWER-campgrounds Examples of community water systems include ________. a. municipalities b. municipal utility districts c. rural water supply corporations d. mobile home parks e. all the above - ANSWER-e. all of the above A federal agency impacting the water utility industry is the _____. - ANSWER-EPA The most important federal law impacting the water utility industry is the _____. - ANSWER- Safe Drinking Water Act (PL93-523)
The four national safety and quality standards for drinking water covered in the Safe Drinking Water Act are physical, chemical, ________ and radiological. - ANSWER-bacteriological The state agency that regulates drinking water in Texas and administers the federal Safe Drinking Water Act is the ________. - ANSWER-TCEQ Water utility system personnel are required to notify the TCEQ of changes or alterations of the system, a new facility to be built, and water supply ________. - ANSWER-health hazards Some regional and local agencies impacting the water utility industry are municipal utility districts, rural water supply corporations, drainage districts, ________, groundwater conservation districts, and subsidence districts. - ANSWER-river authorities Public relations (PR) is the relationship between YOU, the water utility employee, and the _____. - ANSWER-customer The keys to good customer relations are (1) everything the utility does is PR, (2) customers are entitled to courteous treatment, (3) every employee is a PR person. (true/false) - ANSWER- true
Most groundwater is relatively free of suspended matter, but ________ can be a major problem in surface water. - ANSWER-turbidity Color in a public water supply should be less than _____ units. - ANSWER-less than 15 units Chemical characteristics of water include hardness, pH, solids, and ________. - ANSWER-gases Water is considered hard when it exceeds ________ mg/L of calcium carbonate. - ANSWER- 100 (may vary depending on who you talk to) A gallon of water weighs _____ pounds and 1 mg/L equals one ________. - ANSWER-water weights 8.34 pounds 1 mg/L equals one part per million Hydrogen sulfide is heavier than air, colorless, flammable, toxic, and has a ________ odor. - ANSWER-rotten egg (unless you get a dose that's so heavy it numbs your sense of smell) Excessive nitrates in drinking water can cause ________ syndrome in infants. - ANSWER-blue baby syndrome
Excessive amounts of fluoride may cause ________ or staining of teeth. - ANSWER-mottling Trihalomethanes and haloacetic acids are byproducts of chlorination and may increase ________ risk. - ANSWER-cancer The action level for copper is _____ mg/L and for lead it is _____ mg/L. - ANSWER-copper is 1. mg/L lead is 0.015 mg/L _____ are underground, water-bearing formations yielding useful quantities of water. - ANSWER-Aquifers The quantity of water a formation yields depends on the thickness and _____ of the formation.
- ANSWER-permeability Problems caused by _____ are declining water levels and subsidence. - ANSWER-overpumping Well _____ and cementing protect the well from collapse and surface contamination. - ANSWER-Well casing
One way to reduce sand pumping is to _____ the pump rate and cycle more. - ANSWER- decrease Water from a new well must not be used until bacteriological samples on three successive days show _____. - ANSWER-no coliform found The water level without the pump running is called the static level, the water level with the pump running is called the pumping level, and the difference between the two is called the _____. - ANSWER-drawdown Groundwater usually contains more dissolved minerals and gases than surface water, but fewer ________. - ANSWER-microorganisms Water table wells are usually ________ wells. - ANSWER-shallow In a water table well, the cone of depression is a ________ area around the well. - ANSWER- dewatered A sanitary control easement must cover land within ________ feet of a public well. - ANSWER- 150 feet
Livestock and septic tanks must be no closer than ________ feet to a public well. - ANSWER- 50 feet Underground fuel tanks and septic drainage fields must be at least ________ feet from a public well. - ANSWER-150 feet Feedlots, sewage treatment plants, and landfills must be at least ________ feet from a public well. - ANSWER-500 feet A well may be developed by surging, overpumping, jetting, and ________. - ANSWER- backwashing To disinfect a new well, a chlorine dosage of at least ________ mg/L of chlorine is required. - ANSWER-50 mg/L Changes in well water levels or the volume of water produced can alert the operator to a drop in the water table, screen stoppage, or damage to the ________. - ANSWER-pump Common deep well pumps include the ________ and the vertical turbine. - ANSWER- submersible
Methods for controlling taste and odor problems are _____, algae control, aeration, chemical oxidation, and activated carbon. - ANSWER-lake destratification One of the causes of taste and odor problems is _____ and _____. - ANSWER-algae and bacteria Coagulants are sodium aluminate, aluminum sulfate, ferrous sulfate, and sodium chloride. (true/false) - ANSWER-false (sodium chloride is table salt) _____ cause small particles in water to clot together forming floc, and this process, flocculation, forms larger particles that settle more readily. - ANSWER-Coagulants _____ tests help the operator determine the chemical and dosage to apply. - ANSWER-Jar tests Turbidity, pH, temperature, alkalinity, and chemical dosage affect _____. - ANSWER-coagulation To remove suspended solids and chlorine-resistant microorganisms, surface water must be disinfected. (true/false) - ANSWER-false (it must be filtered) _____ is the final step in removing suspended matter and chlorine-resistant microorganisms. - ANSWER-Filtering
A common filter is the slow sand filter, having several layers of differently sized media. (true/false) - ANSWER-false (the rapid sand filter) A filter must be _____ when a head loss of 6 to 10 feet occurs. - ANSWER-backwashed Most surface water is low in minerals, gases, and ________. a. algae b. turbidity c. dissolved solids d. bacteria - ANSWER-c. dissolved solids Quality water has low amounts of color, turbidity, solids, and ________. a. oxygen b. taste and odor c. hydrogen d. all listed - ANSWER-b. taste and odor
