Sample splitting policy for the industrial pretreatment program.
Columbus City Codes § 1145.63
in effect1145.63 - Sample splitting policy for the industrial pretreatment program.
The city will offer split samples for compliance with Columbus City Code Chapter 1145 with any industrial user that requests a sample split and follows the following protocol:
(A) The city's sample split request form must be used by the industrial user.
(B) The city will split the wastewater sample with the industrial user at the industrial user's facility in accordance with chain-of-custody protocol.
(C) The industrial user's sample split must be analyzed and analytical results submitted to the city's industrial pretreatment program no later than the last business day, close of business, of the month following the month of sample collection. Failure to do so will result in loss of sample split privileges with the city for a period of one (1) year.
(D) Analytical results from the city's lab and the industrial user's lab will be compared, only in instances where the same approved laboratory analytical methods found in 40 CFR Part 136 and applicable QA/QC was used. If both data are found valid, results may be averaged. When widely divergent results occur, the data can be investigated in a timely manner by the respective laboratories. If one (1) of the results is found invalid, resampling may occur, and the sample splitting procedure again followed. When data reconciliation is not possible, results from the city's split will determine compliance with pollutant discharge limits.
(E) The sample split policy does not apply to demand samples that are used for purposes of determining extra-strength charges. Demand samples can be split. The results of the split from the user will not be averaged in the city's determination of a user's extra-strength charge.
(F) If the split sample indicates a violation, the user must notify the city's industrial pretreatment program within twenty-four (24) hours of becoming aware of the violation. The user shall also repeat the sampling and analysis and submit the results of the repeat analysis to the city's industrial pretreatment program within thirty (30) days after becoming aware of the violation.
(Ord. No. 1327-2012, § 1, 7-23-2012, eff. 10-1-2012; Ord. No. 2320-2025, § 1, 9-28-2025)
Source: City of Columbus, City Codes and City Charter (Municode Library, library.municode.com)URL: https://library.municode.com/oh/columbus/codes/code_of_ordinances?nodeId=TIT11WASEELCO_CH1145SEUSRE_1145.60--1145.67INMORE_1145.63SASPPOINPRPRFetched: 10/27/2026