California Water System/Treatment Operator Grade 2 (T2) Exam
California Water System/Treatment Operator Grade 2 (T2) Exam
California Water System/Treatment Operator Grade 2 (T2) Exam
California Water System/Treatment Operator Grade 2 (T2) Exam
Mostly Accurate Tested Relevant Coverage Areas
1. Coagulation, Flocculation, and Sedimentation Process Control
2. Filtration Operations, Backwash, and Media Maintenance
3. Disinfection Chemistry, CT Values, and Breakpoint Chlorination
4. California Title 22 Regulations, MCLs, and Reporting Requirements
5. Treatment Plant Mathematics and Chemical Dosage Calculations
6. Corrosion Control, Lead and Copper Rule, and Water Quality Stability
7. Pump, Motor, and Instrumentation Operation and Troubleshooting
8. Laboratory Practices, Sampling, and Process Monitoring
9. Safety, Chemical Handling, and Emergency Response
,10. Source Water Quality, Reservoir Management, and Seasonal Variations
California Water System/Treatment Operator Grade 2 (T2) Exam
1. Which operational adjustment is most appropriate when raw water
turbidity rises sharply after a storm and jar tests show the existing coagulant
dose is no longer effective?
☐ A. Increase the coagulant dose and optimize pH based on the new jar test
results
☐ B. Reduce the coagulant dose and increase the filter loading rate to
maintain production
☐ C. Bypass sedimentation and send the water directly to the filters to save
chemicals
☑ D. Shut down the plant entirely until the raw water turbidity returns to its
baseline level
Rationale: Elevated turbidity and natural organic matter after storms require
coagulant dose adjustment and pH optimization to restore particle
destabilization and protect filters . 5 13
,2. What is the primary purpose of gentle flocculation following rapid mix in a
conventional treatment plant?
☑ A. To promote collisions between destabilized particles and form larger
settleable floc
☐ B. To rapidly disperse the coagulant chemical throughout the raw water
☐ C. To disinfect the water by providing extended contact time with chlorine
☐ D. To increase the velocity of water enough to scour the sedimentation
basin floor
Rationale: Flocculation uses slow, gentle mixing to encourage microfloc
particles to collide and agglomerate into larger, denser floc that settles
effectively . 2
3. A sedimentation basin is 100 feet long, 20 feet wide, and 10 feet deep with
a flow of 1.0 MGD. What is the detention time in hours?
☐ A. 2.4 hours
☑ B. 3.6 hours
☐ C. 4.8 hours
, ☐ D. 6.0 hours
Rationale: Volume = 100 × 20 × 10 = 20,000 ft³ × 7.48 = 149,600 gal; flow =
1,000,000 ÷ 24 = 41,667 gph; time = 149,600 ÷ 41,667 ≈ 3.6 hours . 14
4. An operator observes mudballs forming in a rapid sand filter and
shortened filter runs despite normal filtration rates. Which condition most
likely explains this problem?
☐ A. Excessive underdrain pressure during the filtration cycle
☑ B. Inadequate backwash bed expansion and uneven backwash distribution
☐ C. Excessive chlorine residual entering the filter influent
☐ D. Low sedimentation basin detention time during peak flow periods
Rationale: Mudballs form when solids are not properly removed during
backwash; insufficient bed expansion leaves accumulated material trapped
within the media . 13
5. When a filter reaches its maximum allowable head loss, what is the most
appropriate operational action?
☐ A. Increase the filtration rate to force water through the clogged media
California Water System/Treatment Operator Grade 2 (T2) Exam
California Water System/Treatment Operator Grade 2 (T2) Exam
California Water System/Treatment Operator Grade 2 (T2) Exam
Mostly Accurate Tested Relevant Coverage Areas
1. Coagulation, Flocculation, and Sedimentation Process Control
2. Filtration Operations, Backwash, and Media Maintenance
3. Disinfection Chemistry, CT Values, and Breakpoint Chlorination
4. California Title 22 Regulations, MCLs, and Reporting Requirements
5. Treatment Plant Mathematics and Chemical Dosage Calculations
6. Corrosion Control, Lead and Copper Rule, and Water Quality Stability
7. Pump, Motor, and Instrumentation Operation and Troubleshooting
8. Laboratory Practices, Sampling, and Process Monitoring
9. Safety, Chemical Handling, and Emergency Response
,10. Source Water Quality, Reservoir Management, and Seasonal Variations
California Water System/Treatment Operator Grade 2 (T2) Exam
1. Which operational adjustment is most appropriate when raw water
turbidity rises sharply after a storm and jar tests show the existing coagulant
dose is no longer effective?
☐ A. Increase the coagulant dose and optimize pH based on the new jar test
results
☐ B. Reduce the coagulant dose and increase the filter loading rate to
maintain production
☐ C. Bypass sedimentation and send the water directly to the filters to save
chemicals
☑ D. Shut down the plant entirely until the raw water turbidity returns to its
baseline level
Rationale: Elevated turbidity and natural organic matter after storms require
coagulant dose adjustment and pH optimization to restore particle
destabilization and protect filters . 5 13
,2. What is the primary purpose of gentle flocculation following rapid mix in a
conventional treatment plant?
☑ A. To promote collisions between destabilized particles and form larger
settleable floc
☐ B. To rapidly disperse the coagulant chemical throughout the raw water
☐ C. To disinfect the water by providing extended contact time with chlorine
☐ D. To increase the velocity of water enough to scour the sedimentation
basin floor
Rationale: Flocculation uses slow, gentle mixing to encourage microfloc
particles to collide and agglomerate into larger, denser floc that settles
effectively . 2
3. A sedimentation basin is 100 feet long, 20 feet wide, and 10 feet deep with
a flow of 1.0 MGD. What is the detention time in hours?
☐ A. 2.4 hours
☑ B. 3.6 hours
☐ C. 4.8 hours
, ☐ D. 6.0 hours
Rationale: Volume = 100 × 20 × 10 = 20,000 ft³ × 7.48 = 149,600 gal; flow =
1,000,000 ÷ 24 = 41,667 gph; time = 149,600 ÷ 41,667 ≈ 3.6 hours . 14
4. An operator observes mudballs forming in a rapid sand filter and
shortened filter runs despite normal filtration rates. Which condition most
likely explains this problem?
☐ A. Excessive underdrain pressure during the filtration cycle
☑ B. Inadequate backwash bed expansion and uneven backwash distribution
☐ C. Excessive chlorine residual entering the filter influent
☐ D. Low sedimentation basin detention time during peak flow periods
Rationale: Mudballs form when solids are not properly removed during
backwash; insufficient bed expansion leaves accumulated material trapped
within the media . 13
5. When a filter reaches its maximum allowable head loss, what is the most
appropriate operational action?
☐ A. Increase the filtration rate to force water through the clogged media
