Sampling and analysis.

A. Sampling shall be performed so that a representative portion of the wastewater is obtained for analysis.B. All measurements, tests, and analyses of the characteristics of waters and wastes required in any section of this chapter or by rules of the Sewer District shall be carried out in accordance with procedures specified in 40 CFR Part 136 by a laboratory certified by NYSDOH to perform the analyses on the pollutant being tested. Such samples shall be taken at the approved monitoring stations described in § 257-100 , if such a station exists. If an approved monitoring station is not required, then samples shall be taken from another location on the industrial sewer lateral which is approved by the Chief Plant Operator and/or Superintendent of Sewers, before discharge to the public sewer.

Unless specifically requested otherwise, or unless specifically not allowed in federal regulations, samples shall be gathered as flow-proportioned (where feasible) composite samples made up of individual samples taken not less than once per hour for the period of time equal to the duration of industrial wastewater discharge during daily operations (including any cleanup shift). A portion of the sample(s) taken will be made available to the person whose premises is being sampled, if he so requests, at or prior to the time it is collected.