alternative sampling date. The system must submit an explanation for the delayed sampling date to the Director concurrent with the shipment of the sample to the laboratory. (ii) (A) If a system is unable to report a valid analytical result for a scheduled sampling date due to equipment failure, loss of or damage to the sample, failure to comply with the analytical method requirements, including the quality control requirements in or the failure of an approved laboratory to analyze the sample, then the system must collect a replacement sample. (B) The system must collect the replacement sample not later than 21 days after receiving information that an analytical result cannot be reported for the scheduled date unless the system demonstrates that collecting a replacement sample within this time frame is not feasible or the Director approves an alternative resampling date. The system must submit an explanation for the delayed sampling date to the Director concurrent with the shipment of the sample to the laboratory. (c) Systems that fail to meet the criteria of paragraph (b) of this section for any source water sample required under R309-215-15(2) must revise their sampling schedules to add dates for collecting all missed samples. Systems must submit the revised schedule to the Director for approval prior to when the system begins collecting the missed samples. (4) Sampling locations. (a) Systems required to conduct source water monitoring under R309-215-15(2) must collect samples for each plant that treats a surface water or GWUDI source. Where multiple plants draw water from the same influent, such as the same pipe or intake, the Director may approve one set of monitoring results to be used to satisfy the requirements of R309-215-15(2) for all plants. (b) (i) Systems must collect source samples prior to chemical treatment, such as coagulants, oxidants and disinfectants, unless the system meets the condition of paragraph (b)(ii) of this section. (ii) The Director may approve a system to collect a source sample after chemical treatment. To grant this approval, the Director must determine that collecting a sample prior to chemical treatment is not feasible for the system and that the chemical treatment is unlikely to have a significant adverse effect on the analysis of the sample.
(F) Systems may use this equation to determine log credit between the indicated values Log credit = (0.001506 x (1.09116) Temp) x CT. (ii) Systems receive the Cryptosporidium treatment credit listed in this paragraph by meeting the corresponding ozone CT values for the applicable water temperature, as described in paragraph (a) of this section. CT values ((MG)(MIN)/L) for Cryptosporidium inactivation by Ozone listed by the log credit with inactivation listed by water temperature in degrees Celsius. (A) 0.25 Log Credit: (I) less than or equal to 0.5 degrees: 6.0; (II) 1 degree: 5.8; (III) 2 degrees: 5.2; (IV) 3 degrees: 4.8; (V) 5 degrees: 4.0; (VI) 7 degrees: 3.3; (VII) 10 degrees: 2.5; (VIII) 15 degrees: 1.6; (IX) 20 degrees: 1.0; (X) 25 degrees: 0.6; and (XI) 30 degrees: 0.39. (B) 0.5 Log Credit: (I) less than or equal to 0.5 degrees: 12; (II) 1 degree: 12; (III) 2 degrees: 10; (IV) 3 degrees: 9.5; (V) 5 degrees: 7.9;