1. (a) Subject to (c), below, if a PFAS contaminant is detected in a representative sample at a level greater than 50% of the MCL, the O/O shall:

   1. (1) Collect a confirmation sample under the same contributing conditions within 14 days of being notified of the result; and
   2. (2) Have the sample analyzed for the contaminant(s) detected.
2. (b) If a confirmation sample is required pursuant to (a) above, the results of the initial and confirmation samples shall be averaged to determine compliance with the MCL specified in Env-Dw 705.06.

3. (c) If results from the sampling point or the contributing sources have historically demonstrated the presence of that PFAS contaminant at a level greater than 50% of the MCL, then:

   1. (1) A confirmation sample shall not be required; and
   2. (2) The monitoring frequency for the approved sampling point shall be determined pursuant to Env-Dw 712.24 or Env-Dw 712.27, as applicable.

Source. #12838, eff 9-30-19