Class C Drinking Water License Exam Solved 100%

Answer Mottling of teeth Bacteriological test results will be considered unacceptable if the test were completed more than ____ days before FDEP receives them? - Answer 60 Before a new or altered well is placed into service, they shell be disinfected according to AWWA C654 as incorporated into FAC 62-55.330 and bacteriological samples taken for? - Answer 20 consecutive days FAC 62-255.350 (10) (a) requires water systems to telephone the State warning Point (SWP) ____ after the discovery of any actual or suspected sabotage or security breach or any suspicious incident involving their system. - Answer Immediately/within 2 hours What does it mean if the sum of fewer than 4 quarters exceeds 0.320mg/L for TTHM and 0.240 mg/L for HAA5? - Answer System is immediately in violation since it will exceed applicable MCL even if the remaining quarters to be tested are zero Compliance with TTHM/HAA5 MCLs is based on? - Answer Running annual average for systems monitoring quarterly When sampling for coliform, if the sample point is suspected of being contaminated, and a new sample point is not available, what must be done? - Answer Swab with 100 mL NaOCL When the TTHM/HAA5 samples are taken. what other test is taken? - Answer Chlorine For water systems monitoring TTHM/HAA5 annually, if the routine sample exceeds the MCL, what are they required to do? - Answer Immediately begin quarterly monitoring What sample is taken at a point that represents the longest residence time? - Answer TTHM and HAA5 Which quarter does DEP consider acceptable for the month of warmest temperature? - Answer 3rd If you grab more TTHM/HAA5 samples than the minimum required, which of the following is true? - Answer Grab 25% of the samples at a point representing the longest residence time At what location in the distribution system should the chlorine residual samples be taken? - Answer At the same points that Coliform samples are taken At what location in the distribution system should the TTHM/MAA5 samples be taken? - Answer At a location that represents the maximum residence time in the distribution system What is the minimum monitoring frequency for ground water systems serving less than 10,000 people? - Answer 1 sample per plant per year during warmest water temperature For systems using ozone, what is the MCL (maximum containment level) for bromate? - Answer 10 ppb and 0.01 mg/L What is the MCL for Haloacetic Acids (HAA5) - Answer 80 ppb Sulfur Dioxide is a colorless ____ which, when it comes in contact with mucous membranes of the body, forms____? - Answer gas, H2SO4 Sludge collection device should move? - Answer Slowly Oxygen transfer rate is dependent on? - Answer Total area of water exposed to air Troubleshooting is a technique for? - Answer Identifying problems, cause, and solutions Besides a DO meter, what other method can you use to measure DO? - Answer Winler-Azide method What is an advantage of using a DO probe and meter? - Answer Allows measurement to be taken directly in stream A sample collected for pH measurement should be? - Answer Measured for temperature Flow recorders in a water plant record? - Answer Rate of flow at a given time Wards and certain employees of the state may be exempted from? - Answer Examination fees What does HTH stand for? - Answer High Test Hypochlorite The available chlorine in HTH is the? - Answer Pounds of available chlorine in the container The maximum Cl2 concentration that a person may be safely exposed to for one hour is? - Answer 4 PPM A glass tube partially filed with liquid that measures gas is called? - Answer Manometer Hypochlorites tend to? - Answer Increase pH The positive electrode where corrosion takes place is called? - Answer Anode The physical and chemical changes that occurs between a coagulant and alkaline compounds in water to form an incipient floc is called? - Answer Coagulant all chlorinators used for metering gaseous chlorine operate basically as? - Answer Pressure reducing devices Which of the following is an indication that the backwash rate are too low? - Answer High initial head loss The ratio of permeate to fed flow in RO treatment is _____percent? - Answer Recovery WTP MORs must be kept on site for _____years. - Answer 10 Water plant records must be kept on site for _____years - Answer 10 Main line valves should be ____ apart. - Answer 800-1,000 feet Fire hydrants in commercial zoned areas should not be more than? - Answer 300 feet from any point of a commercial building Dry fire hydrants have their operating valve where? - Answer At the bottom How far apart should fire hydrants be in residential area? - Answer 500 feet Water with a TDS concentration of 150 mg/L may be classified as? - Answer Slightly Saline A positive mineral ion found in high concentration in deep well water that can cause hard boiler scaling is? - Answer Silica Properly coagulated water shows? - Answer Clear water between particles The optimum pH range for ferric sulfate usage is? - Answer 4.0-6.2 Which of the following conditions tend to increase corrosion? - Answer Low flow WTP operators are primarily concerned with particles in water that carry a ____? - Answer Negative Electrical charge Coagulants generally used in water treatment process release? - Answer Ions having more than one positive charge The WTP with a hydropneumatics tank is receiving calls concerning air bubbles in the waterlines. What action needs to be taken? - Answer Check storage tank for air pressure, water level, and compressor running time A solution is acidic if there are more ___- than _____. - Answer Hydrogen Ion/Hydroxide Ions Water that contains 220 mg/L of hardness, 100 color units, and 2 NTUs turbidity is best treated by the _____process. - Answer Lime softening The minerals that cause hardness in water are precipitated out as? - Answer Calcium carbonate and magnesium hydroxide The first step of lime softening process is the? - Answer The conversion of CO2 to calcium carbonate Which treatment method will b best for water with a hardness of 360 mg/L, 100 CU's, 3.0 mg/L OC, and 6 NTU turbidity? - Answer Lime softening If finished water has a pH of 8.2 and has high levels of CO2 and DO, the water is? - Answer Corrosive Carbonate hardness is caused by? - Answer Alkalinity Noncarbonate hardness is caused by? - Answer Sulfates Calcium bicarbonate reacts with lime and will precipitate out? - Answer Calcium carbonate The magnesium precipitate is formed at witch pH? - Answer 10.6 The calcium hardness precipitate is formed at what pH level? - Answer 9.4 Oxygen bound up in sulfate compounds may serve as a oxygen source for? - Answer Facultative organisms A shorthand name for a chemical element is? - Answer Chemical symbol When making a determination on water production for a specific day, the amount treated in comparison to the previous day mat be decreased if? - Answer Temperature Decreases Which standards regulate the amount of fluoride in water - Answer Primary Standards and Secondary Standards True color is usually removed by? - Answer Coagulation Apparent color is removed by? - Answer Filtation Velocity sensing devices measure flow by sensing? - Answer Rate of Rotation The water has a marshy or wood odor. What is a likely cause? - Answer Actinomycetes The water has a marshy or woody odor. What action must be taken to verify cause? - Answer Check for organisms in water supply The water has a marshy or woody odor. What is the solution to the problems? - Answer Increase chlorination If 3.5 mL of titrant are used to reach the total alkalinity end point for a 100 mL sample. what is the total alkalinity? - Answer 35 Which chemical must be present in the sterile sample container used to collect samples for coliform analysis? - Answer Sodium Thiosulfate What test uses lactose fermentation to demonstrate the presence or absence of coliform? - Answer Presumptive The same ion exchanged resins that are used to soften water can be used to remove ion and manganese if the water being treated? - Answer Contains no dissolved oxygen When using aeration, the rate of iron oxidation to form insoluble ferric hydroxide can be increased by? - Answer Raising pH Iron and manganese react with ______ to form insoluble compounds? - Answer Chlorine The indicators used in the alkalinity titration change color according to changes in? - Answer pH In a properly operating ion exchange treatment system, the finished water -----? - Answer Is free of calcium and magnesium The finished water from an ion exchange unit has a salty taste to it. What is the likely cause? - Answer The rinse stage was not successful One of the first warnings a water system has of a possible cross connection contamination is a complaint of a water taste or odor that is ________? - Answer Septic or musky When treating very cold water, what change must be considered? - Answer Increase coagulation dose The variable vacuum control on the chlorinator won't feed at maximum rate. Gas pressure and CPRV are good. What is the problem? - Answer Plugged restrictor THM precursors are? - Answer Naturally occurring organic compounds Controlling organic loading and taste and odor problems within a reservoir may reduce or eliminate? - Answer Activated carbon treatment Water treatment plants using solids-contact units require? - Answer Tighter process control and less space to accomplish treatment When sludge is allowed to accumulate too long in a solids-contact unit, ____ is decreased. - Answer Detention time When must MORs be submitted to the FDEP? - Answer Within tin days of the month of operation In January, a WTP is having trouble feeding Cl2. The Cl2 building is heated, but the lines going to the Cl2 are not. What is causing the problem? - Answer Condensation in line R.O. membrane fouling can be caused by? - Answer Bacteria Water supplies with high levels of ____ may produce laxative effects? - Answer Sulfate Which of the following material is a source of lead in drinking water? - Answer Galvanized pipe A well with a caisson that is sunk into the aquifer, with horizontal wells drilled into the aquifer from the bottom of the caisson is called? - Answer A radial well What factor is considered when determining the required capacity of distribution system mains? - Answer Number of service connections What is the static water level of a well? - Answer The water level when the water is not being pumped Before starting any water lubricated pump, an operator should make sure that ______? - Answer Bearing are wet The funnel shaped volume within the radius of influence is called the ____, and for an aquifer this represents that part of the aquifer, which is being dewatered. - Answer Cone of depresion Which of the following conditions are conducive to triggering algal blooms? - Answer Abundant sunlight and nutrient like nitrogen and phosphorous What is the highest possible turbidity reduction reduction expected when operating a filtration process under optimum conditions? - Answer 99.5 By _____ the speed of the recirculation device , in an up flow solids contact unit, a ______ amount of slurry can be retained in the unit? - Answer Increasing/Larger What is a disadvantage of removing noncarbonate hardness? - Answer Sodium content in water is increased What is the most likely source of water with a hardness of 200-300 mg/L an CaCO3 - Answer Groundwater from an area which has a sluble limestone geology Which of the following is a physical characteristic of water? - Answer color What is the best way to control chemical dosage in a treatment plant? - Answer Electronical controlled chemical feeders If a licensed operator is found guilty of gross negligence, FDEP can ____ the operator's license? - Answer Permanently revoke What method can be used to determine the disinfecting power of chlorine? - Answer ORP probes What is the best chemical to use to determine a large amount of water? - Answer Sodium thiosulfate and Sulfur dioxide After adding a new chlorine cylinder, the pressure gauge and rotameter read zero. You switch to another tank with the same results. What's the most likely cause? - Answer Line between valve and chlorinator is clogged Drinking water with high levels of silver may cause? - Answer Blue-gray discoloration of eyes and skin The best test to measure the effectiveness of WTP;s processes is ________. - Answer Turbidity Where is a nonionic filter aid coagulant applied? - Answer Filter influent What type of polymers are frequently used as filter aids? - Answer Cationic and Nonionic In the direct filtration process, what step is omitted? - Answer Sedimentation The release of dissolved oxygen in saturated cold water due to a decrease in pressure may cause what problem in the filter? - Answer Air binding Operating a filter continuously with high head losses will cause? - Answer Air binding What causes mudball formation in a filter? - Answer Improper backwashing What is the fourth step in the backwash procedure? - Answer Start surface wash system What parameters are used to determine a filter backwash time? - Answer Head loss, turbidity. time What is the filtration rate for a slow sand filter? - Answer 0.015-0.15 gpm/sq ft What causes media boils? - Answer Insufficient baskwash rates What are the most important particle removal mechanisms in filtration? - Answer Sedimentation and Absorption A filter has a sudden increase in head loss. Media surface sealing is suspected. What action should be taken? - Answer Evaluate plant processes, jar test is needed