Download Class D Water License – Texas | 100% Correct Answers | Verified | Latest 2024 Version and more Exams Water Resources Planning and Management in PDF only on Docsity!
Class D Water License – Texas | 100% Correct
Answers | Verified | Latest 2024 Version
Operators have a responsibility to provide drinking water that meets federal and state standards. (true/false) - ✔✔true Water must be disinfected, delivered at inadequate pressure, and be ample in quantity. (true/false) - ✔✔false (adequate pressure) Utility employees should guard the water supply and facilities from contamination, public tours, and even terrorism. (true/false) - ✔✔false (public tours) The state requires bacteriological sample results be kept _____ years. - ✔✔5 years The state requires chemical analysis be kept at least _____ years. - ✔✔10 years EPA requires a water system to keep a copy of each consumer confidence report at least _____ years. - ✔✔5 years A public water system provides the public with piped water for human consumption, serves at least _____ service connections, and regularly serves at least _____ individuals daily at least _____ days out of the year. - ✔✔15 service connections 25 individuals 60 days out of the year The water utility field affects everyone because _____. - ✔✔water is essential to life and health The water utility employee should remember customers are entitled to _____ and _____. - ✔✔courteous treatment and answers to questions about water
In Texas, water operator licensing is administered by the _____. - ✔✔TCEQ All public water systems are required to employ licensed operators even if the system only _____ treated water bought from another source. - ✔✔redistributes treated water Public water systems include cities, municipal utility districts, rural water supply corporations, mobile home parks, and _____. - ✔✔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 - ✔✔e. all of the above A federal agency impacting the water utility industry is the _____. - ✔✔EPA The most important federal law impacting the water utility industry is the _____. - ✔✔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. - ✔✔bacteriological The state agency that regulates drinking water in Texas and administers the federal Safe Drinking Water Act is the ________. - ✔✔TCEQ Water utility system personnel are required to notify the TCEQ of changes or alterations of
In small water systems the operator is often _____, _____ and _____. - ✔✔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 - ✔✔e. all of the above Delinquent payment notices should be ________. a. tactful and tasteful b. mailed in an envelope c. businesslike d. all listed - ✔✔d. all listed EPA requires community water systems to provide customers with a ________ report on the system's water quality. - ✔✔yearly If water quality reports are attractive and easy to ________, they can build goodwill and trust with the customer. - ✔✔understand Good treatment of employees includes fair wages, benefits, and ________ working conditions. - ✔✔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 - ✔✔d. postcard or email Listen to special requests and seek solutions to oblige the customer within ________. - ✔✔utility policy Treat customers as though another water utility across the street is competing for your ________. - ✔✔customers The molecular formula for water is _____. - ✔✔H2O Water occurs in three forms: solid ice, liquid water, and water vapor. (true/false) - ✔✔true The _____ is the natural exchange of water between the earth and the atmosphere. - ✔✔hydrologic cycle Average water use depends on temperature, rainfall, cost, supply, and economic level. (true/false) - ✔✔true Groundwater is located above the earth's surface and tapped by wells. (true/false) - ✔✔false (groundwater is below the surface) _____ water comes from rivers, lakes, and reservoirs. - ✔✔Surface Future water supplies will become more plentiful according to the TCEQ. (true/false) - ✔✔false Surface water or groundwater prior to treatment is called _____ water. - ✔✔raw water _____ water means the water is free of disease-causing organisms, has a chlorine residual, and is safe for human consumption. - ✔✔Potable
Surface water supplies should be sampled for chemical analysis every year and groundwater supplies should be sampled _____. - ✔✔every 3 years _____ and _____ and other minerals cause hardness in water. - ✔✔Calcium and magnesium The pH scale ranges from _____ to _____. - ✔✔0 to 14 A pH of _____ is neutral. - ✔✔7 is neutral Common gases found in water include hydrogen sulfide, carbon dioxide, methane, and sodium chloride. (true/false) - ✔✔false (sodium chloride is table salt) Chemically, water is made of ________. - ✔✔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 - ✔✔a. nature's way of recycling water The quality standard for public water supplies is based on the use of water for ________. - ✔✔drinking One of the most important purposes of a public water supply is _______. a. swimming b. landscape watering c. car washing d. firefighting - ✔✔d. firefighting Organic matter includes ________.
a. sand b. plants, animals and humans c. minerals d. all listed - ✔✔b. plants, animals and humans The most important treatment process is ________, which destroys disease-causing organisms. a. filtration b. disinfection c. softening d. fluoridation - ✔✔b. disinfection Public water systems are required to compile a monthly report showing ________. a. rate increases b. accidents c. dates of dead-end flushing d. disciplinary action - ✔✔c. dates of dead-end flushing Most groundwater is relatively free of suspended matter, but ________ can be a major problem in surface water. - ✔✔turbidity Color in a public water supply should be less than _____ units. - ✔✔less than 15 units Chemical characteristics of water include hardness, pH, solids, and ________. - ✔✔gases Water is considered hard when it exceeds ________ mg/L of calcium carbonate. - ✔✔100 (may vary depending on who you talk to) A gallon of water weighs _____ pounds and 1 mg/L equals one ________. - ✔✔water weights 8. pounds
The _____ of the screen is determined by the size of the aquifer material, the size of the gravel in the gravel pack, and the type of well development. - ✔✔mesh size The gravel pack is fine gravel placed around the screen to reduce pumping _____. - ✔✔sand The _____ is a vacuum breaker allowing the casing to breathe as water levels change when the pump cycles. - ✔✔well vent All public wells must be provided with a _____ sealing block, a meter, a screened vent, and a sampling faucet. - ✔✔concrete No source of contamination is allowed within _____ feet of a public well. - ✔✔50 feet One way to reduce sand pumping is to _____ the pump rate and cycle more. - ✔✔decrease Water from a new well must not be used until bacteriological samples on three successive days show _____. - ✔✔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 _____. - ✔✔drawdown Groundwater usually contains more dissolved minerals and gases than surface water, but fewer ________. - ✔✔microorganisms Water table wells are usually ________ wells. - ✔✔shallow In a water table well, the cone of depression is a ________ area around the well. - ✔✔dewatered A sanitary control easement must cover land within ________ feet of a public well. - ✔✔150 feet
Livestock and septic tanks must be no closer than ________ feet to a public well. - ✔✔50 feet Underground fuel tanks and septic drainage fields must be at least ________ feet from a public well. - ✔✔150 feet Feedlots, sewage treatment plants, and landfills must be at least ________ feet from a public well. - ✔✔500 feet A well may be developed by surging, overpumping, jetting, and ________. - ✔✔backwashing To disinfect a new well, a chlorine dosage of at least ________ mg/L of chlorine is required. - ✔✔ 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 ________. - ✔✔pump Common deep well pumps include the ________ and the vertical turbine. - ✔✔submersible Gases such as methane, carbon dioxide, and hydrogen sulfide are reduced by ________. - ✔✔aeration Water from rivers, lakes, and reservoirs is called _____. - ✔✔surface water _____% of public water systems use surface water. - ✔✔40% Boat ramps, marinas, and docks should not be located within _____ feet of a water intake. - ✔✔1, feet Surface water contains bacteria, algae, and turbidity, but is low in minerals, gases, and dissolved solids. (true/false) - ✔✔true
A filter must be _____ when a head loss of 6 to 10 feet occurs. - ✔✔backwashed Most surface water is low in minerals, gases, and ________. a. algae b. turbidity c. dissolved solids d. bacteria - ✔✔c. dissolved solids Quality water has low amounts of color, turbidity, solids, and ________. a. oxygen b. taste and odor c. hydrogen d. all listed - ✔✔b. taste and odor Pretreatment includes lake destratification, control of algae, debris removal, presedimentation, aeration, ________, and activated carbon adsorption. - ✔✔chemical oxidation Copper sulfate in dosages of ________ and approved algaecides control algae blooms. a. 10 to 50 mg/L b. 1 to 5 mg/L c. 0.1 to 0.5 mg/L d. 0.01 to 0.05 mg/L - ✔✔c. 0.1 to 0.5 mg/L The most effective treatment for taste and odor is adsorption with ________. - ✔✔activated carbon Lime is applied to water to adjust ________. - ✔✔adjust pH or alkalinity The process of using chemicals to clot particles together is called _____ and _____. - ✔✔coagulation and flocculation
Detention time in sedimentation basins must be at least ________ hours to allow floc to settle. - ✔✔ 6 Factors affecting sedimentation are weight of the floc, ________, detention time, and short-circuiting. a. water temperature b. water velocity c. taste and odor d. a and b - ✔✔d. water temperature and water velocity Backwashing should expand the filter bed by ________%. - ✔✔30 to 50 A common filter problem is ________, prevented by proper backwashing. - ✔✔mud balls Chemicals used in disinfection are chloramine, chlorine, chlorine dioxide, and ________. - ✔✔ozone Disinfection destroys disease-causing microorganisms called _____. - ✔✔pathogens Disinfection destroys pathogens without sterilizing the water. (true/false) - ✔✔true Waterborne pathogens live and grow in the intestines of infected people. (true/false) - ✔✔true _____ fecal matter entering a water supply transmits pathogens to healthy people. - ✔✔Infected Some diseases transmitted by unsafe water include typhoid, dysentery, cholera, measles, polio, and cryptosporidiosis. (true/false) - ✔✔false (measles is not transmitted this way) Each water sample is tested for all waterborne diseases. (true/false) - ✔✔false (not all)
It is possible to have positive bacteriological samples removed from your record. (true/false) - ✔✔true It is _____ public health risk if a positive fecal coliform repeat sample or a positive total coliform repeat sample follows a positive fecal coliform routine sample. - ✔✔an acute Acute violations require public notification within 72 hours by radio and television using the words "Minor Health Concern." (true/false) - ✔✔false (it's a major health concern) In the event of low distribution pressure (below _____ psi), water outages, repeated unacceptable microbiological samples, or failure to maintain adequate chlorine residuals, special precautions must be instituted by the water system. - ✔✔20 psi In Texas, all public water systems are required to have ________ facilities. a. ozonation b. chlorination c. softening d. trihalomethane - ✔✔b. chlorination Chlorination is the most important process in the production of ________ water. - ✔✔potable Besides disinfection, chlorine is used for taste and odor control and ________. a. oxidation of iron and manganese b. oxidation of hydrogen sulfide c. disinfection of repairs d. all listed - ✔✔d. all listed Sodium hypochlorite is liquid ________. - ✔✔bleach Bleach used in public water systems must be ________ approved. - ✔✔NSF
Calcium hypochlorite is made by reacting chlorine with ________. - ✔✔lime Calcium hypochlorite will cause explosions or fires if it contacts ________ material. - ✔✔organic At room temperature, chlorine gas is greenish-yellow, has a pungent odor, is ________ times heavier than air. - ✔✔2. The maximum sustained gas withdrawal rate from 150-lb. cylinders (vacuum transmission) is ________ lb(s)./day per degree F. - ✔✔1 lbs/day Disinfection capacity for drinking water must be ________% greater than the highest expected dosage. - ✔✔50% Small water systems often use ________ to disinfect their water supply. - ✔✔hypochlorinators Hypochlorinators consist of a mixing tank, water, ________ hypochlorite, or ________ hypochlorite and a chemical pump. - ✔✔sodium hypochlorite calcium hypochlorite Gas chlorinators use a rotameter to meter chlorine in ________ or grams/hr. - ✔✔lbs/day Dosage is the amount of chemical applied, demand is the amount of chemical used up, ________ is the amount of chemical remaining after reacting with demand. - ✔✔residual Minimum chlorine residuals of ________ (free) and ________ (combined) are required in the far reaches of the distribution system. - ✔✔0.2 (free) 0.5 (combined/total) The DPD and chlorine reaction turns the water a ________ color. - ✔✔pink to red
In case of leaks, the best source of help is the ________. - ✔✔supplier After contacting chlorine gas, wash in a safety shower or with ________. - ✔✔a garden hose _____ facilities equalize demand on the water supply. - ✔✔Storage _____ allows uniform pump rates, supplies water for firefighting, and provides time for disinfection. - ✔✔Storage Ground storage at a surface water treatment plant is called a _____. - ✔✔clear well The TCEQ requires storage tanks to have covered vents, an airtight cover, overruns, and _____. - ✔✔entry ports If ground storage is the only storage, capacity must be _____ gallons per connection. Otherwise, total storage capacity (elevated storage included) must be _____ gallons per connection. - ✔✔200 gallons per connection 200 gallons per connection If a 30-inch diameter access opening is not provided in a storage tank, the primary roof access must not be less than _____ inches. - ✔✔30 inches Storage must be painted, disinfected, and maintained according to OSHA standards. (true/false) - ✔✔false (AWWA standards) No paint, coating, or wax containing _____ is allowed in storage tanks. - ✔✔lead Storage tank coatings for contact with potable water must be approved by EPA, the National Sanitation Foundation, or the Food and Drug Administration. (true/false) - ✔✔true
_____ is a tank, usually steel, supported aboveground on a tower. - ✔✔Elevated storage Pressure from an elevated tank is maintained by the _____. - ✔✔height of the water column In storage tanks, each foot of water column produces _____ psi. - ✔✔0.433 psi Water stored at least _____ feet above the highest service connection provides the state's minimum normal operating pressure of _____ psi. - ✔✔80.85 feet above the highest connection 35 psi A _____ is a tank resting on the ground that is greater in height than diameter. - ✔✔standpipe Pressure inside a _____ tank is provided by air mechanically compressed against the water surface. - ✔✔hydropneumatic tank The exterior and interior of ground, elevated, standpipe, and pressure tanks must be inspected _____. - ✔✔yearly Storage tank inspection results must be kept at least _____ years. - ✔✔5 years _____ is an electrochemical method of preventing corrosion of the interior of metal tanks. - ✔✔Cathodic protection Ownership signs must include the utility name and emergency phone number at each production, treatment, or storage site. (true/false) - ✔✔true Chain link fence material must leave a gap at the ground to trim grass. (true/false) - ✔✔false The state requires stored water to have a disinfectant demand. (true/false) - ✔✔false (it requires a disinfectant residual)
