Virginia Administrative Code
Title 9 - ENVIRONMENT
Agency 25 - STATE WATER CONTROL BOARD
Chapter 790 - SEWAGE COLLECTION AND TREATMENT REGULATIONS
Part IV - Reports and Forms
Article 1 - Reports
Section 9VAC25-790-960 - Influent and effluent sampling
Universal Citation: 9 VA Admin Code 9VAC25-790-960
Current through Register Vol. 41, No. 3, September 23, 2024
A. Sampling tests and frequency. Table C lists the typical recommended minimum sampling program schedules for all sewage treatment works (STW).
B. STW effluent tests and frequency of effluent testing and frequency of other sampling for a treatment works will be provided in the VPDES permit or the VPA permit.
| TABLE C. TYPICAL SAMPLING PROGRAMS FOR SEWAGE TREATMENT WORKS. | |||||
| PLANT SIZE | >2.01 MGD | 1.0-2.0 MGD | 0.101-0.999 MGD | 0.401-0.1 MGD | 0.0011-0.04 MGD |
| Flow | Totalizing, Indicating & Recording | Totalizing, Indicating & Recording | Totalizing, Indicating & Recording | Totalizing, Indicating & Recording | Estimate |
| BOD5, TSS, TKN | 24- HC 1/ Day | 24- HC 5 Days/ Wk | 8-HC 3 Days/ Wk | 4-HC 1 Day/ Wk | Grab 1/month |
| Total Nitrogen* Total Phosphorus* | 24- HC 1/ Week | 24- HC 1/ Week | 8-HC 1/ 2 Weeks | 4-HC 1/ Month | Grab 1/month |
| TRC, Contact tank** | Grab 1/2 Hr | 4/Day at 4 Hr.Intervals | 3/Day at 4 Hr.Intervals | 3/Day at 4 Hr.Intervals | Grab 1/Day |
| Fecal Coliform** | Grab 1/Day 10am-4pm | Grab 5 Days/Wk 10am-4pm | Grab 3 Days/Wk 10am-4pm | Grab 1/Week 10am-4pm | Grab 1/Month 10am-4pm |
| pH, DO, TRC Effluent | Grab 1/Day | Grab 1/Day | Grab 1/Day | Grab 1/Day | Grab 1/Day |
| WQS Parameters (Toxics) | 1/8,24 HC or 1/month | 1/8,24 HC or 1/month | 1/8, 8HC or 1/month | 1/8, 4HC or 1/month | Grab 1/month |
Statutory Authority
§ 62.1-44.19 of the Code of Virginia.
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