9 Va. Admin. Code § 25-790-970
B. Sampling instructions. The following sampling instructions should be followed when taking samples:
2. All other samples should be grab samples.
| TABLE D-1. RECOMMENDED OPERATIONAL AND CONTROL TESTING. | ||
| Unit Process Parameters | Testing Location/Frequencies (see key for description) | |
| 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 |
§ 62.1-44.19 of the Code of Virginia.
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.