Class D Water Operator License Exam TCEQ With Complete Solutions.

Class D Water Operator License Exam TCEQ With Complete Solutions. T/F: In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. True Water covers approximately ________ of Earth's surface. 71% Drought is an extended period when a region receives a deficiency in its ________ water supply. atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking True Excluding outside water use, the average household uses about _______ gallons of water per month for inside use 2,000 T/F: Only 3% of all the fresh water on earth can be easily accessed for use. False (only 1%) T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the Safe Drinking Water Act from the EPA. True T/F: PWS officials should be pro-active in their approach to terrorism. 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. Rule of Capture In Texas, agricultural water demand accounts for about ___% of the total water used. 57% T/F: An example of a non-transient non-community PWS is a rural school. True Monitoring average and maximum daily water ______ enables us to plan ahead for growth. Demand T/F: The Safe Drinking Water Act sets standards for drinking water including physical, chemical, bacteriological, and radiological characteristics. True "Potable" means water is safe to drink and has a measurable chlorine ________. Residual The plant operator is responsible for a sufficient supply of safe and ________ drinking water. 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. False (130 gals per person per day) T/F: The primary state regulator of water utilities is the TCEQ. 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. True Meter readers bring in operating revenue and profoundly impact _____ relations. Public The federal regulator of drinking water is the _____. EPA T/F: Duties of distribution operator include repairing leaks, making taps, flushing mains, and taking radiological samples. False (Repair leaks, Make taps, Flush mains, Operate pumps, Take bacteriological samples) A service area has 1000 service connections. What can we estimate the population of this service area to be? 3,000 (multiply connections x 3) T/F: The State must be notified after an existing facility is changed or after construction of a new facility. False (must notify before) T/F: A Class "D" license is valid for 2 years at ground and purchase water systems with 250 connections or less. False (3 years) T/F: The physical characteristics of water are color, taste, odor, temperature, and turbidity. True An alkaline or basic solution has a pH greater than ____. 7 T/F: The terms mg/L and ppm are not interchangeable. False (they are interchangeable) Suspended solids in water cannot be filtered out. False (they can) Solids, water hardness, pH and gases are ____ characteristics. Chemical T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. True T/F: The State recommends a water pH of less than 7 to be maintained at all time. 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. True T/F: The deeper the well, the warmer the water. True T/F: The threshold odor number (TON) relates to the number of dilutions needed for the water to be tasteless. 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. 1 million The State requires filtered water to be equal to or less than ____ turbidity units in at least 95% of the monthly samples. 0.3 The State recommends a TON of ___ or less. 3 T/F: The State recommends 20 color units or less for a quality water. 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. True T/F: The red color caused by iron is an example of suspended or apparent color and it can be removed by filtration. True Excessive calcium and _____ are the primary cause of hardness in water. Magnesium T/F: The State recommends a maximum total dissolved solids content of 500 mg/L False (The state recommends that TDS not exceed 1000 mg/L) There are 3 common gases found in water: methane, carbon dioxide, and __________ ___________. hydrogen sulfide T/F: Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection. True T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. False (flaming requires less contact time) T/F: The "primary limits" refer to chemicals with maximum contaminant levels that can be exceeded. 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. True T/F: Pathogens are disease-causing microorganisms. True If a routine sample is positive, flush the positive sample point, check the chlorine residual, then resample within 24 days of notification. 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. Ammonia If there is no chlorine ______ at a faucet, do not sample, flush longer. residual T/F: All repeat samples must be collected on successive days. 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. 20/water/residual Get the sample to the lab within ___________ or it will be rejected. 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. mottling T/F: One by-product of chlorinated drinking water is trihalomethane, a suspected carcinogen. True Repeat samples must be taken at (a) the _______ ______ (b) within 5 connections upstream and (c) within 5 connections downstream. positive point T/F: If you do not fill out the submission form completely, you risk losing credit for the sample. True T/F: The presence of fecal coliform in a water sample indicates fecal contamination from a human or warm-blooded animal. 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. active T/F: Keep the sample in ice or in a cooler prior to and during lab transport because heat stimulates bacterial growth. True The action level for lead is _______ mg/L and for copper it is _____ mg/L. .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. True A certain group of bacteria is used to indicate the possible presence of a pathogen--- the ________ group. Coliform Disinfection is the destruction of disease-causing microorganisms called ______. Pathogens