Texas Wastewater Class A Question & Answers 2024, Exams of Nursing

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Seeding of BOD samples is necessary when samples - Correct Answers ✅✅(All of the above) have a chlorine residual, have a previously been chlorinated, have been subjected to high temperatures, contain high or low pH industrial wastes When is blue-green algae the most dominant on a pond treatment system? - Correct Answers ✅✅Summer A 30-inch diameter wastewater interceptor is observed to be flowing half-full at about two fps. The approximate volume of wastewater flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 = 2, gpm - Correct Answers ✅✅c. 2,200 gallons per minute A one-cylinder reciprocating sludge pump with a 10-inch bore and a 5- inch stroke pumps at a rate of 50 cycles per minute. How many minutes must the pump be operated to pump 5,000 gallons of sludge? 3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min 84.5 gpm b. 29 - Correct Answers ✅✅60 minutes If an existing centrifugal pump motor is replaced with a motor with 25 percent more speed, the motor horsepower required will increase by 1.25 x 1.25 x 1.25 = 1.95 - Correct Answers ✅✅95 percent

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When must TCEQ be notified about expansions of a treatment facility? - Correct Answers ✅✅Before construction In an anaerobic digester, the percentage of methane and carbon dioxide gas content should be - Correct Answers ✅✅70% methane, 30% carbon dioxide The temperature of an anaerobic digester should be maintained at a minimum of - Correct Answers ✅✅ 95 ° F What type of wastewater treatment operates in the endogenous bacteria growth phase? - Correct Answers ✅✅Extended air Why is recirculation needed in a trickling filter? - Correct Answers ✅✅Keep the media wet Further reduce BOD All of the above (a, b, and c) What type of fire extinguisher would be used on an electrical control panel that has been de-energized? - Correct Answers ✅✅Class A Class C (a and d) Disinfection with chlorine is the most effective at a pH of - Correct Answers ✅✅6.

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The biomass on a normal functioning RBC has what appearance? - Correct Answers ✅✅Grey to brown and 0.05 to 0.1 inch thick The sludge from a primary clarifier should percent solids? - Correct Answers ✅✅4% to 6% What is eutrophication in a pond system? - Correct Answers ✅✅Enrichment with nitrogen and phosphorous Causes algae blooms (b and c) How often should pH meters be calibrated? - Correct Answers ✅✅Daily In Texas, pH meters are required to be calibrated on how many buffers?

• Correct Answers ✅✅two An industrial complex has a BOD discharge to the POTW of 500 pounds per day. The population equivalent of this industry is 500 lbs = 2, 0.17 lbs BOD person - Correct Answers ✅✅ 2941 The parameters of the BOD test are - Correct Answers ✅✅5 days at 20° Centigrade

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Standard Dimension Ratio in pvc pipe is defined as - Correct Answers ✅✅Ratio of OD pipe diameter to wall thickness How should shoring be removed from a trench? - Correct Answers ✅✅up from the bottom up In low pressure sewer systems where each tap must have a grinder pump lift station, station is considered to be - Correct Answers ✅✅part of the collection system and the responsibility of the utility Effective communication depends on - Correct Answers ✅✅being a good listener When designing a wastewater collection system, the engineer considers the population for how many years in the future? - Correct Answers ✅✅ 50 According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure shall have a minimum psi pressure rating of - Correct Answers ✅✅ 150 The minimum velocity of flow in a wastewater line should be - Correct Answers ✅✅2.0 fps

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At a construction job site, as the roadway speed increases, the spacing between cones and barricades should - Correct Answers ✅✅increase The major cause of wastewater line stoppages is - Correct Answers ✅✅roots and grease Carbon monoxide (CO) poisoning symptoms are - Correct Answers ✅✅tightness in the chest nausea drowsiness and headache (all of the above) The smallest pipe size for air recirculation of a self-priming centrifugal pump is - Correct Answers ✅✅1 inch Dangerous gases in a confined space may not be detected with the physical senses because - Correct Answers ✅✅some gases have no odor some gases may deaden the sense of smell some gases may displace the oxygen (all of the above) What are the dangerous gases a collection system worker might come into contact with? - Correct Answers ✅✅CO2 CO НaS CH4 (all of the above)

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On a construction job site, equipment booms must maintain at least how many feet of clearance from overhead electric lines? - Correct Answers ✅✅ 10 How should trench shoring be installed? - Correct Answers ✅✅to above the top of the trench When setting work goals for an employee, the goals should be - Correct Answers ✅✅accompanied by an action plan According to Chapter 317, Design Criteria, a manhole can be installed within 9 feet of an existing waterline if - Correct Answers ✅✅the manhole is completely watertight and tested for no leakage As the population of a collection system increases, the ratio of peak flow to average daily flow will - Correct Answers ✅✅decrease Motivating workers to do a better job is best done by - Correct Answers ✅✅letting workers participate in setting goals One important element of a good communicator is - Correct Answers ✅✅being a good listener

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Monitoring and reporting records of a wastewater treatment plant shall be kept at the facility site for a period of - Correct Answers ✅✅d. three years The TCEQ Design Criteria requires that deflection tests be performed on all new installed flexible or semi-rigid pipe after the final backfill has been in place for 30 days. This deflection test is usually performed using a rigid ball or mandrel that has a diameter equal to -percent of the inside diameter of the pipe. - Correct Answers ✅✅c. 95 Seeding of BOD samples is necessary when samples - Correct Answers ✅✅e. all of the above A one-cylinder reciprocating sludge pump with a 10-inch bore and a 5- inch stroke pumps at rate of 50 cycles per minute. How many minutes must the pump be operated to pump 5,000 gallons of sludge? - Correct Answers ✅✅3.14 x0.416 x0.416 x0.416 x 50x7.48 = 84.5 gpm 5000 gal = 59.2min 84.5 gpm d. 60 minutes e. When is blue-green algae the most dominant on a pond treatment system? - Correct Answers ✅✅Summer What is the purpose of biomonitoring of a plant's effluent? - Correct Answers ✅✅d. Test for toxicity

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Technology The management function of selecting and training employees of an organization is called - Correct Answers ✅✅staffing e. controlling When must TCEQ be notified about expansions of a treatment facility? - Correct Answers ✅✅Before construction In an anaerobic digester, the percentage of methane and carbon dioxide gas content should be - Correct Answers ✅✅b. 70% methane, 30% carbon dioxide The temperature of an anaerobic digester should be maintained at a minimum of - Correct Answers ✅✅ 95 ° F

13. What type of wastewater treatment operates in the endogenous bacteria growth phase? - Correct Answers ✅✅Extended air Why is recirculation needed in a trickling filter? - Correct Answers ✅✅a. Keep the media wet b. Further reduce BOD c. Flood the filter to control ponding and filter flies

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15. What type of fire extinguisher would be used on an electrical control panel that has been de-energized? - Correct Answers ✅✅f. a class a and d class c Disinfection with chlorine is the most effective at a pH of - Correct Answers ✅✅6.
16. The biomass on a normal functioning RBC has what appearance? - Correct Answers ✅✅Grey to brown and 0.05 to 0.1 inch thick The sludge from a primary clarifier should contain what percent solids?

• Correct Answers ✅✅b. 4% to 6% What is eutrophication in a pond system? - Correct Answers ✅✅Enrichment with nitrogen and phosphorous Causes algae blooms

20. A wastewater stabilization pond has 130,680 sq. ft. It has a three to one slope on the embankment and has an average depth of 5 ft. Approximately how many people will this pond provide wastewater treatment for? 130,680 sq ft = 3 acres x 35 lbs / BOD/ acre = 105 lbs BOD =618 0.17 lbs BOD/ person 43,560 sq ft l acre - Correct Answers ✅✅d. 600

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A"Racetrack" is what type of Activate Sludge treatment? - Correct Answers ✅✅Extended air Which form of activated sludge must have primary clarifiers? - Correct Answers ✅✅Conventional What is the relationship between F/M ratio and MCRT? - Correct Answers ✅✅Indirect; if one goes up, the other goes down Which activated sludge process does not achieve complete nitrification? - Correct Answers ✅✅Contact stabilization Which form of activated sludge does the better job of handling shock or toxic loads? - Correct Answers ✅✅Complete mix Which of activated sludge has two aeration basins per single treatment unit? - Correct Answers ✅✅Contact stabilization

27. A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One method of correcting the problem is to - Correct Answers ✅✅Increase F/M ratio by wasting more

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problem is Testing of mixed liquor indicates the MLSS is 2500 mg/L and the settling test shows that a 1000 ml sample settles to 400 mls after 30 minutes. What is the SVI? 400 x 1000 2500 160 - Correct Answers ✅✅ 160 In the problem above, what the sludge quality? - Correct Answers ✅✅Bulking Which activated sludge process has 18 to 20 + hours detention time in the aeration basin? - Correct Answers ✅✅Extended air What is the minimum clearance from the sidewall of a pipe to the trench wall in an excavation? - Correct Answers ✅✅4 inches What is the definition of pH? - Correct Answers ✅✅The logarithm of the reciprocal of the hydrogen ion concentration The negative logarithm of the hydrogen ion concentration How often should pH meters be calibrated? - Correct Answers ✅✅Daily trench is 4,100 feet long, four 4 wide and 6 feet deep. There is a 12-inch diameter pipe in the bottom of the trench. How many cubic yards of material were removed from the trench? 4x6x4,100 3,644 27 - Correct Answers ✅✅3,

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In the problem above, how many cubic yards of material will be required to fill the trench? 3.14x0.5 x0.5 x 4,100 =119cu yds 27 3,644 - 119 = 3,525 - Correct Answers ✅✅3, What is the standard chlorine residual and contact time on Texas discharge permits? - Correct Answers ✅✅e. None of the above organization increases, As the complexity of an organization increases, what management function becomes most important? - Correct Answers ✅✅Planning The following scenario is to be used in answering questions 38, 39, and

40. A pump with a 15-inch impeller is running at 1170 RPM s, with pump efficiency of 75%, and is pumping 500 gpm with 75 feet of head. If the RPM of the pump is increased to 1750 RPMS calculate the following: New output in gpm: - Correct Answers ✅✅1750 1770 =F = 1.5 500 x 1.5 = 750 gpm 750 New head in feet: 75 x 1.5 x 1.5 = 168.75 - Correct Answers ✅✅ 170 New horsepower required: - Correct Answers ✅✅750 x 170 - 43 3960 x 0.75 a. 43

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What compound or compounds are formed when Cl, combines with water? - Correct Answers ✅✅Both a and d When chlorinating treated wastewater, what chlorine residual do we test for? - Correct Answers ✅✅Chloramine and Total What is the standard pH range on Texas effluent discharge permits? - Correct Answers ✅✅b. 6.0 to 9. A wastewater treatment plant has a clarifier that is 80 feet in diameter and is 12 feet deep. The flow is 2.5 mgd. The single weir is two feet inside the outer wall and is 3 feet deep. What is the clarifier detention time in hours? - Correct Answers ✅✅What is the clarifier detention time in hours? 2,500,000 gpd - 104,167 gph 24 hrs/day 3.14 x 40 x 40 x 9 x 7.48 gal 3.14 x 36 x 36 x 3 x 7.48 = 91,318 338,216 + 91,318 429, gallons 429,534 gals = 4.1 hrs 104,167 gph 4. What is the hydraulic loading on the clarifier in gal/sq ft/day? - Correct Answers ✅✅3.14 x 38 x 38 = 4,534 sq ft 2,500,000 gpd = 551 gal / sq ft I day 4,534 sq ft 551 What is the weir loading in gal/linear ft/day? 3.14 x 76 = 239 ft of weir 2,500,000 gpd = 10,460 gal / lin ft / day 239 ft weir - Correct Answers ✅✅10,

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In Texas, an oxidation ditch treatment plant is referred to as - Correct Answers ✅✅Racetrack In Texas, pH meters are required to be calibrated on how many buffers?

• Correct Answers ✅✅two An industrial complex has a BOD discharge to the POTW of 500 pounds per population equivalent of this industry is - Correct Answers ✅✅ 500 lbs - 2,941 0.17 lbs BOD/ person 2941 What substance will interfere with a DPD chlorine test? - Correct Answers ✅✅Manganese The parameters of the BOD test are - Correct Answers ✅✅5 days at 20° Centigrade An Imhoff tank is what type of treatment process? - Correct Answers ✅✅Primary Standard Dimension Ratio in pve pipe is defined as - Correct Answers ✅✅Ratio of OD pipe diameter to wall thickness

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MSDS sheets must be kept for how many years after you have stopped using the chemical? - Correct Answers ✅✅c. 30 A pneumatic ejector is - Correct Answers ✅✅a. a lift station pumping device How should shoring be removed from a trench? - Correct Answers ✅✅d. from the bottom up

57. The most common pump used in the collection system is - Correct Answers ✅✅d. centrifugal In low pressure sewer systems where each tap must have a grinder pump lift station, the lift station is considered to be - Correct Answers ✅✅Part of the collection system and the responsibility of the utility Effective communication depends on - Correct Answers ✅✅being a good listener A construction site safety evaluation checklist must include - Correct Answers ✅✅a. placement of equipment, vehicles, and spoil bank b. placement of flaggers, barricades, cones and other safety equipment c. use of warning signs

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When designing a wastewater collection system, the engineer considers the population for how many years in the future? - Correct Answers ✅✅ 50 According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure mains shall have a minimum psi pressure rating of

• Correct Answers ✅✅ 150 The minimum velocity of flow in a wastewater line should be - Correct Answers ✅✅2.0 fps At a construction job site, as the roadway speed increases, the spacing barricades should - Correct Answers ✅✅increase A piston pump with a 5-inch piston and a 10-inch stroke strokes 60 times a minute. How many minutes will operated to pump 6, gallons? - Correct Answers ✅✅5x5x0.0408x0.833x60 = 51 gpm 6,000 gal/51 gpm=117. round to 118

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A bubbler level control system works off of what principal? - Correct Answers ✅✅differential pressure

67. The major cause of wastewater line stoppages is - Correct Answers ✅✅roots and grease What type of valve is usually used for isolation? - Correct Answers ✅✅gate Carbon monoxide (CO) poisoning symptoms are - Correct Answers ✅✅a. tightness in the chest b. nausea c. drowsiness and headache d. all of the above Fresh wastewater is desirable because it is much easier to treat. The physical characteristics of fresh wastewater are - Correct Answers ✅✅dishwater gray in color The smallest pipe size for air recirculation of a self-priming centrifugal pump is - Correct Answers ✅✅b. 1 inch Dangerous gases in a confined space may not be detected with the physical senses because - Correct Answers ✅✅a. some gases have no odor b. some gases may deaden the sense of smell c. some gases may displace the oxygen

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What are the dangerous gases a collection system worker might come into contact with? - Correct Answers ✅✅a. CO2 b. CO c. H,S d. CH, e. all of the above When designing a wastewater rehab program, the first step is to - Correct Answers ✅✅d. define the objectives of the program The goal of a sanitary wastewater physical survey is to - Correct Answers ✅✅Identifying problems in the system need a rehab When should drop manholes be utilized? - Correct Answers ✅✅wastewater velocities greater than ten fps flows entering the manhole 24 inches or greater above the floor Sewer balls or pigs are what type of wastewater cleaning equipment? - Correct Answers ✅✅mechanical cleaning equipment On a construction job site, equipment booms must maintain at least how many feet clearance from overhead electric lines? - Correct Answers ✅✅a. 10

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How should trench shoring be installed? - Correct Answers ✅✅Two above the top of the trench If an existing centrifugal pump motor is replaced with a motor with 20 percent more speed, the motor horsepower required will increase by - Correct Answers ✅✅1.2x1.2x1.2=1.728 73 percent When setting work goals for an employee, the goals should be - Correct Answers ✅✅accompanied by an action plan According to Chapter 317, Design Criteria, a manhole can be installed within 9 feet of an existing waterline if - Correct Answers ✅✅if a. the manhole is completely watertight and tested for no leakage As the population of a collection system increases, the ratio of peak flow to average daily flow will - Correct Answers ✅✅decrease

84. One of the most important factors affecting the slope of a gravity wastewater line is - Correct Answers ✅✅pipe bedding a wastewater pipe has a slope of 4 feet in 200 feet, it is referred to as - Correct Answers ✅✅c. 0.02 feet per foot d. two percent

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When laying bell and spigot wastewater - Correct Answers ✅✅trench bedding should be scooped out at joints > support pipe on the barrel the bell end should be pointed upstream Motivating workers to do a better job is best done by - Correct Answers ✅✅letting workers participate in setting goals One important element of a good communicator is - Correct Answers ✅✅Good listener A 24-inch wastewater interceptor is observed to be flowing half-full at 3 fps. The approximate volume of wastewater flowing through the line is

• Correct Answers ✅✅3.14 x1x1x3 = 9.42 = cfs 9.42 x 449 = 4229. gpm 4229.58 = 2114.79 2,115 gpm When using a fire hydrant to flush wastewater lines, - Correct Answers ✅✅a. the hydrant should be opened and closed slowly b. if flow needs to be controlled, use an external valve not the hydrant internal c. an air gap or backflow prevention device must be utilized d. all of the above A collection system that averages 1.0 mgd or more must employ. - Correct Answers ✅✅a. at least one Class III Collection operator or a Class B Wastewater operator

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Before making major changes in the collection system or the treatment plant, detailed designed by a professional engineer must be submitted to TCEQ before - Correct Answers ✅✅beginning construction When connecting a public water supply to any source of potential contamination, an air gap of what size must be provided? - Correct Answers ✅✅two times the inlet pipe diameter The most important purpose for wastewater treatment is - Correct Answers ✅✅to remove harmful contaminants from the wastewater before it is discharged to the waters of the state Septic wastewater has what properties? - Correct Answers ✅✅a. dark in color b. offensive odor e. Jacks dissolved oxygen d. is harder treat than fresh wastewater e. all of the above One of the requirements of the Texas Hazard Communication Act of 1985 is that the employer must hold annual training in which the utilities' written policies and the employee's rights are explained to - Correct Answers ✅✅all employees The Federal Clean Water Act - Correct Answers ✅✅requires a permit for disposal of sludge requires a permit for ocean discharges of sewer c.

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requires a permit for disposal or placement of dredge material creates a national permit system for all wastewater discharge Pretreatment of industrial waste will help minimize - Correct Answers ✅✅sludge contamination interference to the treatment process safety hazards to workers discharge of industrial pollutants in the effluent If an employee is guilty of misconduct as defined by the utilities personnel policies, the supervisor should - Correct Answers ✅✅attempt to modify the employee's behavior through training and other forms of assistance inform the employee of the consequences if the behavior is not modified When fighting an electrical fire, you should - Correct Answers ✅✅Use non-conductive extinguishing methods c. Use Class A or B extinguishers if electricity to the unit has been shut-off d. Either b or e A particular construction project has a total of 3,000 feet of 12-inch pipe, 15 manholes, 50 wastewater connections. Based upon the contract unit costs shown, if the contractor has completed 2,000 feet of pipe, 12 manholes, and 30 wastewater connections, what percentage of the total project has been completed? 12 inch pipe place $85.00 per linear foot

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Manholes in place $1,500.00 each Wastewater connections $250.00 each - Correct Answers ✅✅3000 x 85 = 255,000 15 x1500 = 22,500 50x 250 = 12,500 255,000 + 22,500+ 12,500 = $290,000 2000 x 85 = 170,000 12x1500 - 18,000 30x250 =7,500 170,000 + 18,000 + 7,500 = S195,500 195,000/290000 =0.67 = 67% If the float that turns on the lead pump in a wastewater lift station is situated above a gravity influent line, the line will - Correct Answers ✅✅tend to have a grease problem If an operations company ceases its operation or is sold such that control of the company is transferred to another party, - Correct Answers ✅✅the company's operations certificate is revoked In 2.5 minutes, a lift station will fill up 18" with no pumps running. In 3.25 minutes, both pumps will drop the level in the lift station 18". In 7

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minutes, the large pump will drop the level 18". What is the capacity of the small pump? The lift station is 10' x 10 x 10'. 10x10x1.5x7.48=1122 1122 gal/2.5=449 gpm inflow Both 1122/3.25=345 gpm + 449 gpm = 794 gpm both Large 1122/7=160 gpm + 449 gpm = 609 gpm large Small 794 gpm - 609 gpm = 185 gpm - Correct Answers ✅✅185 gpm H,SO, is a(n). - Correct Answers ✅✅chemical compound What is the velocity of water flowing through a clarifier that is 16 feet deep x 45 feet wide 135 feet long if the flow is 5,837 gpm? Q- AxV 13=720x fps - Correct Answers ✅✅0.02 fps

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A chemical element is a - Correct Answers ✅✅atom Chemical dechlorination can be accomplished with? - Correct Answers ✅✅a. sodium Bisulfite b. sulfur Dioxide A crucible and filter weigh 21.6870 grams. After filtering 50 ml of sample through the filter, and then drying, desiccating and weighing them, the crucible, filter, and sample weigh 21.7250 grams. How many mg/L of suspended solids are in the sample? - Correct Answers ✅✅b. 760 Three hundred milliliters of 0.02 N H,SO, is needed for a lab test. The lab stocks a standard of 0.5 N. How many ml of the 0.5 N will be needed? 300 x0.02 = V x0.5 300x0.02 0.5 - Correct Answers ✅✅ 12 How would an operator increase the degree nitrification in an activated sludge plant? - Correct Answers ✅✅increase D0 and increase sludge age What processes are used to check an upset activated sludge plant? - Correct Answers ✅✅BOD loadings, F/M ratio, SV 30, MCRT, DO When chlorine used, the effective disinfectant is - Correct Answers ✅✅HOCI