Colstrip Steam Electric Station Coal Ash Ponds
DEQ is engaged in an enforcement action against PPL over groundwater contamination caused by leaking ash ponds at their Colstrip Steam Electric Station. The steps both DEQ and PPL must take to address these problems are outlined in the Administrative Order on Consent, which both parties agreed to in 2012.
This webpage includes the documents, maps, and other analyses of the Colstrip site related to the AOC. Because this enforcement action involves complicated legal and environmental factors, DEQ has prepared a set of frequently asked questions about the Colstrip facility. We recommend that anyone interested in DEQ's work at the Colstrip facility refer first to that brief introduction.
To stay up to date with DEQ's work at the PPL Colstrip facility, or with other questions, email firstname.lastname@example.org. We will add you to an email list which receives updates on public notices and other major announcements about this project.
Administrative Order on Consent
The Administrative Order on Consent sets forth the process DEQ and PPL must follow to address groundwater contamination at the Colstrip site.
You can download the entire AOC at this link, and view related documents below:
- 2013 Annual Plan and 5-Year Plan describes DEQ's current workplan for this project.
- AOC Map shows the area of the Colstrip facility that is subject to the terms of the agreement.
- Public Meeting Notice At Colstrip for Units 3 & 4 EHP Site Report (November 2013.)
As a part of the AOC, PPL is required to submit analyses of the groundwater contamination at the Colstrip site. These reports contain the results of groundwater testing performed by PPL in each of the three areas defined in the AOC: at the plant site itself, in addition to the two major pond complexes.
Plant Site Reports and Related Documents:
- Plant Site Report
- Appendices, including Appendix A, Plant Site Groundwater Model report
- DEQ's Substantive Concerns on The Site Report for the Plant Site
- PPL response to DEQ Substantive Concerns
- Plant Site Report Public Comments
- DEQ's Conditional Acceptance of Plant Site Characterization Report
- DEQ's Response to Appendix A of the Plant Site Characterization Report
Units 1 and 2/Stage I and II Evaporation Pond Site Report and Related Documents:
- STOEP SOEP AOC Site Report_Final
- Appendix A
- Public Meeting Monday July 15, 2013
- DEQ Contractor Comments on Units 1 and 2 Site Report
- Comments by Earth Justice on Units 1 and 2 Site Report
- Transcript Units 1 and 2 Public Meeting July 15, 2013
Units 3 and 4 Effluent Holding Pond Report and Related Documents:
- Units 3 and 4 EHP Site Report
- Appendix A (Units 3 Units 3 and 4 EHP Area)
- DEQ Contractor Comments on Units 3 and 4 Site Report
- Comments by Earth Justice on Units 3 and 4 Site Report
In addition to the steps created by the AOC, DEQ has periodically worked with PPL to create plans to address issues as they arise. You can view those plans at this link.
Below are many of the agreements and decisions that precede the 2012 AOC agreed to by DEQ and PPL:
- Certificate of Environmental Compatibility and Public Need
- Board of Environmental Health and Environmental Science Findings
- 1983 Olson Decision
- 12d Stipulation
- Colstrip Well Monitoring Sites as of 2011