Groundwater Professional Bulletin Board

Chapter 135 Revisions from Dec. 17 Meeting

Attached please find the proposed Chapter 135 Revisions submitted to EPC for Information. A list of key changes resulting from the December 17 stakeholder meeting is shown below:

1. Synergistic effects of mixed contaminants and vocabulary related to that issue were removed from the proposed rules as these were complicated to address and need further discussion.
2. The phrase “or other sensitive material” was removed from the proposed rule. If other materials are found to be susceptible to petroleum, these will be addressed with rule changes.
3. The Ten States Standard was removed from reference as this particular standard could change in time.
4. Action levels were revised to include those calculated by ISU, and which were previously circulated to the group and discussed at the stakeholder meeting.
5. Conditions that might necessitate requirement of soil confirmation sampling were added.
6. We added notification requirements that as soon as a potential impact to a water line is known, the water supply must be notified.
7. An addendum was added to Appendix B to include a description of how each action level in the Tier 1 Look-Up Table was calculated.  This is in process pending completion

The department would like to thank everyone who participated in the meeting and/or provided comments. If you have additional questions or comments, please do let us know as there will be follow up stakeholder meetings and public hearings as this process moves forward.