(a) The Authority may inspect the monitoring facilities of any discharger to determine compliance with the requirements of this chapter. The discharger shall allow the authority or its representatives to enter upon the premises of the discharger at all reasonable hours, for the purposes of inspection, sampling or records examination. The Authority shall have the right to set up on the discharger's property such devices as are necessary to conduct sampling, inspection, compliance monitoring and/or metering operations.
(b) Sampling Procedures:
(1) Composite Sampling: It is recommended that influent and effluent operational data may be obtained through 24-hour flow proportional composite samples. Sampling may be done manually or automatically and discretely or continuously. If discrete sampling is employed, at least 12 aliquots should be composited. Discrete sampling may be flow proportioned either by varying the time interval between each aliquot or the volume of each aliquot. All composites should be flow proportional to either the stream flow at the time of collection of the influent aliquot or to the total influent flow since the previous influent aliquot. Volatile pollutant aliquots must be combined in the laboratory immediately before analysis.
Effluent sample collection need not be delayed to compensate for hydraulic detention unless the POTW elects to include detention time compensation or unless the Approval Authority requires detention time compensation. The Approval Authority may require that each effluent sample is taken approximately one detention time tater than the corresponding influent sample when failure to do so would result in an unrepresentative portrayal of actual POTW operation. The detention period should be based on a 24-hour average daily flow value. The average daily flow should in turn be based on the average of the daily flows during the same month of the previous year.
(2) Grab Samples: If composite sampling is not an appropriate technique, grab samples should be taken to obtain influent and effluent operational data. A grab sample is an individual sample collected over a period of time not exceeding 15 minutes. The collection of influent grab samples should precede the collection of effluent samples by approximately one detention period except that where the detention period is greater than 24 hours such staggering of the sample collection may not be necessary or appropriate. The detention period should be based on a 24-hour average daily flow value. The average daily flow should in turn be based upon the average of the daily flows during the same month of the previous year. Grab sampling should be employed where the pollutants being evaluated are those, such as cyanide and phenol, which may not be held for an extended period because of biological, chemical or physical interaction which take place after sample collection and affect the results.
(3) All analysis shall be performed in accordance with procedures established by the Administrator pursuant to section 304(h) of the Act and contained in 40 CFR part 136 and amendments thereto or any other test procedures approved by the Administrator (Part 136.4 and 136136.5). Sampling shall be performed in accordance with techniques approved by the Administrator. Whereas 40 CFR Part 136 does not include sampling and analytical techniques for pollutants in question, sampling and analysis shall be performed using validated analytical methods or other sampling and analytical procedures including procedures suggested by the Authority or other parties approved by the Administer.
(Ord. 84-14. Passed 10-13-14.)
(Ord. 84-14. Passed 10-13-14.)