13.12.650 – Sample collection

  1. Except as indicated in Paragraph B, below, the User shall collect wastewater samples using flow proportional composite collection techniques.  In the event flow proportional sampling is not feasible, the Director of Public Works may authorize the use of time proportional sampling or a minimum of four (4) grab samples where the User demonstrates that this will provide a representative sample of the effluent being discharged.  In addition, grab samples may be required to show compliance with instantaneous discharge limits.
  2. Samples for oil and grease, temperature, pH, cyanide, phenols, sulfides, and volatile organic compounds shall be obtained using grab collection techniques.  A minimum of four (4) grab samples are required.