§ 52.144  SAMPLE COLLECTION.
   (A)   Except as indicated in division (B) of this section, 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, temperature, pH, cyanide, phenols, sulfides, and volatile organic compounds must be obtained using grab collection techniques.  For sampling required in support of baseline monitoring and 90-day compliance reports required, a minimum of four grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide and volatile organic compounds for facilities for which historical sampling data do not exist; for facilities for which historical sampling data are available, the Superintendent may authorize a lower minimum.  For the reports required by this section, the Superintendent shall require the number of grab samples necessary to assess and assure compliance by industrial users with applicable pretreatment standards and requirements.
(Ord. 93-5, passed 2-15-93; Am. Ord. 2015-22, passed 10-5-15)  Penalty, see § 52.999