§ 9-6-26. Biannual Report Required.

(a)

All noncategorical significant industrial users shall submit periodic reports as required, but not less often than semi-annually, indicating the nature and concentration of pollutants in the discharge from the regulated processes governed by pretreatment standards and the average and maximum daily flow for these process units. The reports shall state whether the applicable pretreatment standards and effluent limitations are being met on a consistent basis and, if not, what additional operation and maintenance practices and pretreatment are necessary. Additional requirements for such reports may be imposed by the City.

(b)

If an individual user subject to the reporting requirements in the previous paragraph of this section monitors any pollutant more frequently than required by the City, the results of this monitoring and information on specific sampling and test procedures used shall be included in the report.

(c)

All sampling by significant industrial users for periodic reports must be performed during the period covered by the report.

(d)

All compliance reports must be based upon data obtained through appropriate sampling and analysis preformed during the period covered by the report, which data are representative of conditions occurring during the reporting period. The control authority shall require that frequency of monitoring necessary to assess and assure compliance by industrial users with applicable pretreatment standards and requirements. Grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide and volatile organic compounds. For all other pollutants, 24-hour composite samples must be obtained through flow-proportional composite sampling techniques, unless time-proportional composite sampling or grab sampling is authorized by the control authority, the samples must be representative of the discharge and the decision to allow the alternative sampling must be documented in the industrial user file for that facility or facilities. Using protocols (including appropriate preservation) specified in 40 C.F.R. part 136 and appropriate EPA guidance, multiple grab samples collected during a 24-hour period may be composited prior to the analysis as follows: For cyanide, total phenols, and sulfides the samples may be composited in the laboratory or in the field; for volatile organics and oil and grease the samples may be composited in the laboratory. Composite samples for other parameters unaffected by the compositing procedures as documented in approved EPA methodologies may be authorized by the control authority, as appropriate.

(e)

For sampling required in support of baseline monitoring and ninety-day compliance reports, a minimum of four (4) 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 does not exist; for facilities for which historical sampling data is available, the control authority may authorize a lower minimum. For the periodic reports on continued compliance and reports for industrial users not subject to categorical pretreatments standards, the control authority shall require the number of grab samples necessary to assess and assure compliance by industrial users with applicable pretreatment standards and requirements.

(Ord. No. 2292, § II, 2-8-99; Ord. No. 2749, § XI, 4-13-09; Ord. No. 2758, § XI, 7-13-09)