9VAC25-790-970. Operational testing and control.
A. Minimum tests and frequency. Table D-l contains the typical minimum sampling and testing program for operational control of treatment works greater than 40,000 gallons per day.
B. Sampling instructions. The following sampling instructions should be followed when taking samples:
1. When samples are taken for BOD5, COD, volatile suspended solids, and suspended solids on influent and effluent streams, they should be composite samples.
2. All other samples should be grab samples.
| TABLE D-1. RECOMMENDED OPERATIONAL AND CONTROL TESTING. | ||
| Unit Process Parameters | Testing Location/Frequencies | |
| 1. Primary |
| |
|
| a) DOB5/TSS/TVS | 1/bw; 2,3/2 |
|
| b) settleable solids | 2, 3/d |
|
| c) pH | 2,3,8/d |
| 2. Suspended Growth Reactor |
| |
|
| a) BOD5/nutrients | 1/bw; 2/w; 3/bw |
|
| b) TSS/TVSS | 6/d; 13/w |
|
| c) 30 minute SSV/pH/DO | 6/d |
|
| d) microscopic exam. | 6/w |
| 3. Attached Growth Reactors |
| |
|
| a) BOD5/nutrients | 1/bw; 2/w; 3/bw |
|
| b) TSS/TVS/microscopic exam. | 14/w |
|
| c) pH, DO | 1/d; 2/w |
| 4. Ponds of Lagoons |
| |
|
| a) BOD5/nutrients | 1/w; 2/w |
|
| b) TSS/microscopic exam. | 1/w; 2/w; 7/w |
|
| c) pH/DO/temperature | 1/d; 7/d |
| 5. Anaerobic Digestion |
| |
|
| a) TS/TVS | 6,11,12/w; 8,9,10,13/bw |
|
| b) pH/alkalinity/temp. | 6,12/d; 11,15/bw; 6/w; 13/bw |
| 6. Aerobic Digestion |
| |
|
| a) TS/TVS | 6,11,12/w; 13/bw |
|
| b) settleable solids | 6/d |
|
| c) pH/temperature | 6/d; 15/bw |
|
| d) microscopic exam. | 6/w; 13/bw |
| 7. Sludge Thickening |
| |
|
| a) TS/TVS | 1,2/d |
|
| b) settleable solids | 6/d |
| 8. Sludge Dewatering |
| |
|
| a) TS/TVS | 1,2,4,12/q |
|
| b) pH/alkalinity | 15/q |
| 9. Chemical Clarification |
| |
|
| a) BOD5/COD/TSS/TYS | 1,2/w |
|
| pH/alkalinity | 1,2,3,4,6/d |
|
| b) settleable solids/flocculation | 1,2,6/d |
|
| c) nutrients | 1,2/q |
| 10. Tertiary Filtration |
| |
|
| a) BOD5/TSS | 1,2/w |
|
| b) pH/alkalinity | 1,2/d |
|
| c) nutrients | 1,2/q |
| TABLE D-1 - KEY | ||
| FREQUENCY | SAMPLING LOCATION | |
| d - Daily | 1. Process Influent | |
| w - Weekly | 2. Process Effluents | |
| bw - Biweekly | 3. Influent plus Return Waste Streams | |
| q - Daily when in operation | 4. Following Chemical Addition | |
|
| 5. Filtered Effluent | |
| CONVENTIONAL PARAMETERS | 6. Contents of Reactor | |
| BOD5 - 5-day biochemical oxygen demand | 7. All Cells of Each Lagoon or Pond | |
| SS - Suspended solids | 8. Raw Sludge | |
| TS - Total solids | 9. Primary Sludge | |
| VS - Volatile solids | 10. Secondary Sludge | |
| DO - Dissolved oxygen | 11. Digester Influent | |
| NUTRIENTS - Forms of phosphorus and nitrogen as required by the certificate CTO issued. | 12. Treated Sludge | |
| 13. Return Sludge | ||
| 14. Attached Growth | ||
| 15. Process Supernatant | ||
Statutory Authority
§ 62.1-44.19 of the Code of Virginia.
Historical Notes
Former 12VAC5-581-1030 derived from Virginia Register Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-970, Virginia Register Volume 20, Issue 9, eff. February 12, 2004.