TCEQ A Water Exam (***Verified***)
Study online at https://quizlet.com/_h88hv0
1. Are annual TTHM MCL violations based on the whole system or a specific
location?: Compliance is based on the running annual average of all samples collected over the past 12 months.
2. What are the required SOP components?: Title page, Table of contents, Purpose, Procedures
Quality Assurance/Quality Control References, Approval Signatures (Author, Reviewer, Management Approver, QA
Reviewer)
3. Who is responsible for lead ban enforcement?: Customer Service Inspector
4. A system buys water with 1 ppm chlorine and 0.1 ppm free ammonia. How to
make 2.5 ppm total residual with 0 free ammonia?: Add enough chlorine to reach breakpoint
chlorination (~1.0 ppm chlorine for 0.1 ppm ammonia), then add more chlorine to reach 2.5 ppm residual.
Total chlorine needed H 3.5 ppm.
5. Public notification is required within 24 hours of:: Pressure dropping below 20 psi
E. coli or fecal coliform MCL violations Turbidity > 5.0 NTU
Or at TCEQ's discretion
6. MCL for total coliform?: 1 per 100 mL sample
7. How is the TTHM Operational Evaluation Level (OEL) calculated?: Average the four
most recent quarterly values: (Q1 + Q2 + Q3 + Q4) ÷ 4
8. What is the effect of hypolimnion aeration?: Raises DO in bottom layer, removes metals, and
limits algae nutrients.
Note: Does NOT destroy stratification
9. What are the main sections of a work zone?: Advanced warning area
Transition area
Activity area (includes buffer space and workspace)
Termination area
10. What is enhanced coagulation?: Removal of DBP precursors to a specified level using conventional
coagulation and sedimentation
11. What tests are required for nitrification monitoring?: 1. Free Ammonia- Indicates
excess ammonia that can feed nitrifying bacteria.
2. Total Chlorine- Helps detect chlorine loss due to nitrification activity.
3. Monochloramine- The main disinfectant in chloraminated systems; a drop suggests nitrification.
4. Nitrite (NO₂⁻)- A byproduct of the first stage of nitrification.
5. Nitrate (NO₃⁻)- Formed in the later stage of nitrification.
Note:
, TCEQ A Water Exam (***Verified***)
Study online at https://quizlet.com/_h88hv0
- Free Chlorine (Cl₂) is usually not monitored in chloraminated systems because it's typically absent, except during
free chlorine burns.
- Total Ammonia may be used to calculate free ammonia but is not listed as a required indicator in TCEQ's nitrification
monitoring guidelines.
Source: TCEQ Chloramine Fact Sheet - Monitoring Frequency and Location, per §290.110(c)
12. How does filter media trap particles?: Straining and adsorption
13. How often must turbidity be recorded on individual filters serving >10,000
people?: Every 15 minutes via online turbidimeter and recorder
14. What are the conditions for installing a main under a waterway?: Must be in a
watertight encasement with isolation valves on each side
15. Minimum separation between water and sewer lines?: Normally, 9 ft horizontal
separation is required.
However, if the sewer is pressure-rated, a 6 in vertical separation is allowed with the water line above. (30 TAC
§290.44(e))
16. What is the max lead content for pipes and flux?: Pipes/fittings: d0.25% ; lead Solder/flux:
d0.2% lead
17. How long must Monthly Operating Reports (MORs) be kept?: 10 years
18. Do you need TCEQ approval to blend two reservoirs?: Yes - blending ratio, source, and
constituent calculations must be submitted
19. What is true color?: Color caused by dissolved organic matter; cannot be removed by filtering
20. What are common MCL and MRDL values?: Nitrate: 10 mg/L
Chlorine dioxide: 0.8 mg/L
Chlorite: 1.0 mg/L
Chlorine/Chloramine (MRDL): 4.0 mg/L (RAA) TTHM: 0.080 mg/L
HAA5: 0.060 mg/L
Turbidity: d1.0 NTU, d0.3 NTU 95% monthly samples
Lead: 0.015 mg/L (Action Level)
Copper: 1.3 mg/L (Action Level) Secondary standards:
Iron = 0.3 ppm; Manganese = 0.05 ppm
21. What certification must treatment chemicals have?: ANSI/NSF Standard 60
Note: Standard 61 applies to component systems
Study online at https://quizlet.com/_h88hv0
1. Are annual TTHM MCL violations based on the whole system or a specific
location?: Compliance is based on the running annual average of all samples collected over the past 12 months.
2. What are the required SOP components?: Title page, Table of contents, Purpose, Procedures
Quality Assurance/Quality Control References, Approval Signatures (Author, Reviewer, Management Approver, QA
Reviewer)
3. Who is responsible for lead ban enforcement?: Customer Service Inspector
4. A system buys water with 1 ppm chlorine and 0.1 ppm free ammonia. How to
make 2.5 ppm total residual with 0 free ammonia?: Add enough chlorine to reach breakpoint
chlorination (~1.0 ppm chlorine for 0.1 ppm ammonia), then add more chlorine to reach 2.5 ppm residual.
Total chlorine needed H 3.5 ppm.
5. Public notification is required within 24 hours of:: Pressure dropping below 20 psi
E. coli or fecal coliform MCL violations Turbidity > 5.0 NTU
Or at TCEQ's discretion
6. MCL for total coliform?: 1 per 100 mL sample
7. How is the TTHM Operational Evaluation Level (OEL) calculated?: Average the four
most recent quarterly values: (Q1 + Q2 + Q3 + Q4) ÷ 4
8. What is the effect of hypolimnion aeration?: Raises DO in bottom layer, removes metals, and
limits algae nutrients.
Note: Does NOT destroy stratification
9. What are the main sections of a work zone?: Advanced warning area
Transition area
Activity area (includes buffer space and workspace)
Termination area
10. What is enhanced coagulation?: Removal of DBP precursors to a specified level using conventional
coagulation and sedimentation
11. What tests are required for nitrification monitoring?: 1. Free Ammonia- Indicates
excess ammonia that can feed nitrifying bacteria.
2. Total Chlorine- Helps detect chlorine loss due to nitrification activity.
3. Monochloramine- The main disinfectant in chloraminated systems; a drop suggests nitrification.
4. Nitrite (NO₂⁻)- A byproduct of the first stage of nitrification.
5. Nitrate (NO₃⁻)- Formed in the later stage of nitrification.
Note:
, TCEQ A Water Exam (***Verified***)
Study online at https://quizlet.com/_h88hv0
- Free Chlorine (Cl₂) is usually not monitored in chloraminated systems because it's typically absent, except during
free chlorine burns.
- Total Ammonia may be used to calculate free ammonia but is not listed as a required indicator in TCEQ's nitrification
monitoring guidelines.
Source: TCEQ Chloramine Fact Sheet - Monitoring Frequency and Location, per §290.110(c)
12. How does filter media trap particles?: Straining and adsorption
13. How often must turbidity be recorded on individual filters serving >10,000
people?: Every 15 minutes via online turbidimeter and recorder
14. What are the conditions for installing a main under a waterway?: Must be in a
watertight encasement with isolation valves on each side
15. Minimum separation between water and sewer lines?: Normally, 9 ft horizontal
separation is required.
However, if the sewer is pressure-rated, a 6 in vertical separation is allowed with the water line above. (30 TAC
§290.44(e))
16. What is the max lead content for pipes and flux?: Pipes/fittings: d0.25% ; lead Solder/flux:
d0.2% lead
17. How long must Monthly Operating Reports (MORs) be kept?: 10 years
18. Do you need TCEQ approval to blend two reservoirs?: Yes - blending ratio, source, and
constituent calculations must be submitted
19. What is true color?: Color caused by dissolved organic matter; cannot be removed by filtering
20. What are common MCL and MRDL values?: Nitrate: 10 mg/L
Chlorine dioxide: 0.8 mg/L
Chlorite: 1.0 mg/L
Chlorine/Chloramine (MRDL): 4.0 mg/L (RAA) TTHM: 0.080 mg/L
HAA5: 0.060 mg/L
Turbidity: d1.0 NTU, d0.3 NTU 95% monthly samples
Lead: 0.015 mg/L (Action Level)
Copper: 1.3 mg/L (Action Level) Secondary standards:
Iron = 0.3 ppm; Manganese = 0.05 ppm
21. What certification must treatment chemicals have?: ANSI/NSF Standard 60
Note: Standard 61 applies to component systems
