If required under Env-Or 703.16(d)(2), the permittee shall conduct assessment monitoring as follows:

1. (a) The permittee shall sample the groundwater for all regulated contaminants listed in the table of AGQS in Env-Or 603.03 and the additional parameters specified in Env-Or 703.05(c)(2) within 60 days of notifying the department of the exceedance in the detection monitoring;
2. (b) Based on the results of the sampling required by (a), above, the permittee shall consult with the department to determine the parameters and schedule for subsequent groundwater sampling;
3. (c) If sampling and analysis at a specific well indicates that concentrations of all regulated contaminants in the assessment monitoring are at or below background concentrations for 2 consecutive sampling events, the permittee shall notify the department of this finding and return to detection monitoring at that well;
4. (d) The permittee shall submit the results of the assessment monitoring to the department within 45 days of the date of each round of sampling;
5. (e) The permittee shall establish a background concentration for each regulated contaminant discovered in the assessment monitoring for which a background concentration has not already been established for purposes of detection monitoring; and

6. (f) If a regulated contaminant is detected above the background concentration but below the ambient groundwater quality standard established under Env-Or 603.03 during assessment monitoring, the permittee shall:

   1. (1) Notify the department within 10 days after receiving results; and
   2. (2) Submit a corrective action plan and implementation schedule in accordance with Env-Or 703.18 to the department within 30 days.

Source. (#8812, eff 2-1-07; ss by #10832, eff 6-1-15 (from Env-Or 703.14); ss by #14420, eff 11-4-25, EXPIRES: 11-4-35 (formerly Env-Or 703.18)