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 Virginia Administrative Code (Last Updated: January 10, 2017)
 Title 9. Environment
 Agency 25. State Water Control Board
 Chapter 790. Sewage Collection and Treatment Regulations

  Section 970. Operational testing and control  

Latest version.

  • 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
    (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

Historical Notes

Former 12VAC5-581-1030 derived from Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-970, Virginia Register Volume 20, Issue 09, eff. February 12, 2004.

Statutory Authority

§ 62.1-44.19 of the Code of Virginia.