(A) Except as indicated in division (B) below, the user must collect wastewater samples using flow proportional composite collection techniques. In the event flow proportional sampling is infeasible, the Superintendent may authorize the use of time proportional sampling or a minimum of four 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.
(B) Samples for oil and grease (O&G), temperature, pH, cyanide, phenols, sulfides and volatile organic compounds must be obtained using grab collection techniques.
(Prior Code, § 50.20(6.11))