9VAC25-790-960. Influent and effluent sampling.

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
BOD_5,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.

Historical Notes

Former 12VAC5-581-1020 derived from Virginia Register Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-960, Virginia Register Volume 20, Issue 9, eff. February 12, 2004.

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