§ 58-129. Quality determination/effluent sampling.

(a)

Periodic measurements of flow, suspended solids, BOD and other appropriate waste characteristics for surcharge determination and other purposes shall be made by those permittees specifically designated by the POTW director. The POTW director shall determine the number of 24-hour flow measurements and samples required. Continuous monitoring may be required by the POTW director 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.

(b)

All public sanitary sewer users whose total average sewage 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 five percent of the design capacity of the town's treatment works, or any regional system utilized by the town, shall, unless exempted by the POTW director, 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 arrangements of industrial plant facilities with respect to sewer facilities make such arrangements 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 town or a prior owner. When the POTW director 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 POTW director may require such user to install and maintain sampling facilities as stated in this division. Any sampling facility previously built by the town shall become the maintenance responsibility of the user after October 13, 1981, unless the POTW director shall determine that it is in the best interest of the town for the town to continue maintenance.

(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/DEM certified laboratory in accordance with current standard chemical analysis methods for wastewater established by the EPA/DEM. 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 sampling equipment.

(d)

Unless otherwise prescribed by the POTW director, self-monitoring reports of all the sampling shall be submitted to the town 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.

(Code 2003, § 26-135; Ord. No. 99-04, § 1(22-60), 1-20-2000)