Pollution concentration determination.
A. The pollutant concentration of any sewage, industrial waste or other wastes shall usually be determined from representative samples of effluent discharged to Sewer District sewers or public sewers tributary thereto which are taken by the Sewer District, its designated agent, or qualified personnel working for the user and approved by the Town, at sampling stations as described under § 257-100 of this article, at any period of time and of such duration and in such manner as the Chief Plant Operator and/or Superintendent of Sewers may elect, or at any place or manner mutually agreed upon between the user and the Chief Plant Operator and/or Superintendent of Sewers.
The intent of any sampling procedure is to establish the pollutant concentration in the wastewater discharged during an average or typical working day, including any cleanup shift. This concentration may be derived according to the best judgment of the Chief Plant Operator and/or Superintendent of Sewers.B. Except as indicated in this section, the user must collect wastewater samples using flow-proportional composite collection techniques. In the event flow-proportional sampling is infeasible, the Chief Plant Operator and/or Superintendent of Sewers 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. Samples for oil and grease, temperature, pH, cyanide, phenols, sulfides, and volatile organic compounds must be obtained using grab collection techniques.C. The analysis of samples taken shall be performed in a laboratory in accordance with § 257-103. The surcharge and/or the acceptability of the wastes shall be determined from said analysis. All pollutant analyses, including sampling techniques, which are submitted as part of a wastewater discharge permit application or report shall be performed in accordance with the techniques prescribed in 40 CFR Part 136, unless otherwise specified in an applicable categorical pretreatment standard.
If 40 CFR Part 136 does not contain sampling or analytical techniques for the pollutant in question, sampling and analyses must be performed in accordance with procedures approved by the EPA.D. All charges for surcharges shall be based on the analysis of the wastes from any plant or premises related to total volume of the wastes. The concentration of pollutants in sewage, industrial waste, or other waste once determined as prescribed under § 257-103 of this article shall be used in calculating the sewer surcharge in accordance with the billing procedure of the Sewer District for the collection of charges and shall remain in effect until the person shall prove or the Sewer District shall determine that a change in the manufacturing process, production or waste treatment of said company warrants a reanalysis for the determination of new pollutant concentration of its wastes discharged from such premises into the Sewer District sewers or public sewers tributary thereto.
The new pollutant concentration shall then be used in calculating new charges and shall become effective as of the date of the subsequent billing period.E. If sampling performed by a user indicates a violation, the user must notify the Chief Plant Operator and/or Superintendent of Sewers by phone, fax or e-mail within 24 hours of becoming aware of the violation and in writing within five business days. The user shall also repeat the sampling and analysis of three additional representative samples and submit the results of the repeat analysis to the Chief Plant Operator and/or Superintendent of Sewers within 30 days of becoming aware of the violation.
If the Chief Plant Operator and/or Superintendent of Sewers monitors the user's facility during the resampling period, those samples may be utilized as part of the additional samples required to be taken during that period. The user shall reimburse the Town for the cost of obtaining and testing samples which are required by the user.