Water Supply and Treatment Fundamentals, Exams of Commercial Law

Download Water Supply and Treatment Fundamentals and more Exams Commercial Law in PDF only on Docsity! TCEQ Class D Water Operator License Exam T/F: In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. (Ans- True Water covers approximately ________ of Earth's surface. (Ans- 71% Drought is an extended period when a region receives a deficiency in its ________ water supply. (Ans- atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking (Ans- 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- 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- 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- 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- 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. (Ans- False (130 gals per person per day) T/F: The primary state regulator of water utilities is the TCEQ. (Ans- True One part per million or 1 mg/L means that for every ____ pounds of water there is one pound of material in it. (Ans- 1 million The State requires filtered water to be equal to or less than ____ turbidity units in at least 95% of the monthly samples. (Ans- 0.3 The State recommends a TON of ___ or less. (Ans- 3 T/F: The State recommends 20 color units or less for a quality water. (Ans- 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. (Ans- True T/F: The red color caused by iron is an example of suspended or apparent color and it can be removed by filtration. (Ans- True Excessive calcium and _____ are the primary cause of hardness in water. (Ans- Magnesium T/F: The State recommends a maximum total dissolved solids content of 500 mg/L (Ans- False (The state recommends that TDS not exceed 1000 mg/L) There are 3 common gases found in water: methane, carbon dioxide, and __________ ___________. (Ans- hydrogen sulfide T/F: Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection. (Ans- True T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. (Ans- False (flaming requires less contact time) T/F: The "primary limits" refer to chemicals with maximum contaminant levels that can be exceeded. (Ans- 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- True T/F: Pathogens are disease-causing microorganisms. (Ans- True If a routine sample is positive, flush the positive sample point, check the chlorine residual, then resample within 24 days of notification. (Ans- 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- 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- mottling T/F: One by-product of chlorinated drinking water is trihalomethane, a suspected carcinogen. (Ans- 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- True T/F: The presence of fecal coliform in a water sample indicates fecal contamination from a human or warm-blooded animal. (Ans- 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- 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- .015 / 1.3 T/F: The difference between the static level and pumping level is call the drawdown. (Ans- True Wells dug into artesian aquifers are considered _____ wells. (Ans- deep The well screen prevents _____ from entering the well. (Ans- sand T/F: Treatment of corrosive groundwater can be accomplished by adding alkalinity as lime or soda ash to adjust the pH. (Ans- True T/F: The line shaft turbine is driven by a motor located above the pump at ground level. (Ans- True T/F: Well casing supports the bore hole and helps protect the aquifer from contamination. (Ans- 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- 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- 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- 18 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- 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- 1/4 The State requires wells be protected by ______-______ fences or locked well houses. (Ans- Intruder-resistant Groundwater is usually clear and void of __________. (Ans- 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- 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- True Destratification is the mixing of lake water by compressed air to prevent layers of different __________ from developing. (Ans- 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- 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- 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- minerals / gases Chemical dosage, water temperature, pH, _______, and the characteristics of the raw water all have an effect on the coagulation process. (Ans- mixing The two pathogenic protozoans resistant to chlorination are: ________ and _________ (Ans- giardia / cryptosporidium T/F: Bacteria, algae, and turbidity can be a problem in surface water as can be municipal, industrial and agricultural pollution. (Ans- True T/F: Coagulation works by the bonding of negatively charged turbidity to positively charged chemical coagulants. (Ans- True 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- False To help safeguard against electrocution or machine injury, a safety program should have a ___________ policy. (Ans- lockout / tagout Install all _______ from the top down and remove from the bottom up. (Ans- shoring T/F: Before digging, notify underground utilities. (Ans- 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- 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- traffic Generally, signs should be located on the right-hand side of the road and mounted on supports, posts, or __________ (Ans- 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- equipment T/F: A competent person should inspect the cave-in protection at least daily. (Ans- 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. (Ans- 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- a) 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 - 7 b) 0 - 14 c) 1 - 7 d) 1 - 14 e) none of the above (Ans- 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