1. (a) The permittee shall conduct detection monitoring during the active life of the facility, during closure activities, and for the post-closure monitoring period in accordance with the specific monitoring program established in the release detection permit.

2. (b) The department shall remove a detection monitoring parameter for a facility if the permittee demonstrates that:

   1. (1) The constituent is not contained in the waste managed at the facility; and
   2. (2) The constituent is not generated as a result of the siting or operation of the facility.
3. (c) The permittee shall establish original background concentrations of all constituents required in the detection monitoring prior to issuance of the permit by the department.

4. (d) If the concentration of any constituent in the detection monitoring is above the background concentration at any down-gradient monitoring well, the permittee shall:

   1. (1) Notify the department within 10 days after receiving results; and

   2. (2) Conduct assessment monitoring pursuant to Env-Or 703.17 for each monitoring well for which the concentration of any constituent is above the background concentrations unless:

      1. a. The permittee demonstrates by submission of a report prepared in accordance with Env-Or 704.03 to the department within 60 days of notice of exceedance pursuant to (d)(1) above, that the exceedance is the result of an off-site source of contamination, an error in sampling, analysis, or statistical evaluation, or natural variation in groundwater quality; and
      2. b. The department approves the report.

Source. #8812, eff 2-1-07; ss by #10832, eff 6-1-15 (from Env-Or 703.13); ss by #14420, eff 11-4-25, EXPIRES: 11-4-35 (formerly Env-Or 703.17)