(A) Periodic measurements of flow, suspended solids, BOD5, ammonia nitrogen and other appropriate waste characteristics for surcharge determination and other purposes shall be made by those permittees specifically designated by the District. The District shall determine the number of 24 hour flow measurements and samples required. Continuous monitoring may be required by the District in cases involving large fluctuations in quantity or quality of wastes, or if the wastewater appears to have characteristics which may damage the receiving system. All expenses associated with such monitoring and sampling shall be borne by the permittee(s).
(B) All public sanitary sewer users whose total average discharge is greater than 25,000 gallons per day, or whose total average discharge has a flow or pollutant loading requiring utilization of greater than 5% of the design capacity of the District’s treatment works, shall, unless exempted by the District, install and maintain, at the user’s expense, facilities for continuously measuring and sampling the total waste discharge. This requirement may be waived for a particular user only when the quantity, flow rate and characteristics of the wastewater can be adequately determined without such structures; when the physical arrangement of industrial plant facilities with respect to sewer facilities make such an arrangement unusually costly and other means of ascertaining the quantity, flow rate and characteristics can be devised; or when previous sampling facilities have been built by either the District or a prior owner. When the District shall determine for such facilities discharging less than 25,000 gallons per day that the nature of the discharge and/or conditions of the permit warrant continuous monitoring and sampling, the District may require such user to install and maintain sampling facilities as stated in this section.
(C) All flow measurements, sampling and analysis shall be performed by qualified personnel; all laboratory analyses of industrial wastewater samples shall be performed by an EPA/DWQ certified laboratory in accordance with current standard chemical analysis methods for wastewater established by EPA/DWQ. All samples shall represent the normal wastewater flow from the premises over a 24 hour period. The samples shall be composited according to the flow either manually with at least one sample collected hourly, or by automatic integrated equipment. Sampling for all monitoring parameters shall be in accordance with current standard analysis methods for wastewater approved by the EPA/DWQ.
(D) Unless otherwise prescribed by the Board, self-monitoring reports of the sampling shall be submitted to the District quarterly in accordance with the following schedule:
Monitoring Period | Report Due Date |
January 1 - March 31 | April 15 |
April 1 - June 30 | July 15 |
July 1 - September 30 | October 15 |
October 1 - December 31 | January 15 |
(E) Where a permittee operates as an integrated complex involving varying processes and having separate industrial waste sewer connections within the same contributory area, such permittee may be considered as one unit with multiple connections. An analysis for each connection may be combined in proportion to the flow from the connection, and the weighted average of the results thus obtained may be used as the measure of the total flow and concentration of the wastewater discharged into the public sanitary sewer.
(F) The handling, storage and analysis of all samples taken for the determination of the characteristics of waste discharged shall be performed in accordance with standard methods.
(G) The District may test for quality, to include sampling, any of the waste being discharged to the public sanitary sewers at any time. A duly authorized representative of the District may enter an industrial user’s facility at any time, during business or operational hours, for this purpose or for reviewing operations in the user’s facility to estimate the quality and quantity of wastes being discharged.
(Ord. 2005-01-01, passed 2-21-05)