40 CFR 141.534 - How does my system use this data to calculate an inactivation ratio?

§ 141.534 How does my system use this data to calculate an inactivation ratio?
Use the tables in § 141.74(b)(3)(v) to determine the appropriate CT99.9 value. Calculate the total inactivation ratio as follows, and multiply the value by 3.0 to determine log inactivation of Giardia lamblia:
If your system * * * Your system must determine * * *
(a) Uses only one point of disinfectant application (1) One inactivation ratio (CTcalc/CT99.9) before or at the first customer during peak hourly flowor
(2) Successive CTcalc/CT99.9 values, representing sequential inactivation ratios, between the point of disinfectant application and a point before or at the first customer during peak hourly flow. Under this alternative, your system must calculate the total inactivation ratio by determining (CTcalc/CT99.9) for each sequence and then adding the (CTcalc/CT99.9) values together to determine (ΣCTcalc/CT99.9).
(b) Uses more than one point of disinfectant application before the first customer The (CTcalc/CT99.9) value of each disinfection segment immediately prior to the next point of disinfectant application, or for the final segment, before or at the first customer, during peak hourly flow using the procedure specified in paragraph (a)(2) of this section.
[67 FR 1839, Jan. 14, 2002, as amended at 69 FR 38856, June 29, 2004]

Title 40 published on 2014-07-01

no entries appear in the Federal Register after this date.

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United States Code

Title 40 published on 2014-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 141 after this date.

  • 2014-11-13; vol. 79 # 219 - Thursday, November 13, 2014
    1. 79 FR 67408 - Notice of Public Meeting and Webinar: Preliminary Regulatory Determinations for the Third Contaminant Candidate List
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Notice of public meeting on potential rulemaking.
      The public meeting and webinar will be held on Tuesday, December 9, 2014, from 1 p.m. to 5 p.m., eastern time. Persons wishing to attend the meeting in person or online via webinar must register by December 2, 2014, as described in the SUPPLEMENTARY INFORMATION section.
      40 CFR Part 141