Liberte Environmental Associates

TMDLs Potentially Affecting Water Quality

Existing Final TMDLs - Released by Oregon Department of Environmental Quality

Tualatin River Basin TMDL: Final TMDL Related Documents

This Final TMDL was approved by EPA in August 2001. This watershed is located in northwest Oregon.

Tualatin River Basin Watershed Final TMDL Main Report (2001) (2.9 MB, chapters compiled*)

Tualatin River Basin Watershed Final TMDL Report Appendices (2001) (15.3 MB, appendices compiled*)

Tualatin River Basin Watershed Final TMDL- DEQ Response to Draft Comments (2001)

DEQ Website for the Existing TMDL for the Tualatin River Basin

Links to Tualatin Basin NPDES Permits for sewage treatment plants (STP):
Forest Grove STP
Hillsboro STP
Rock Creek STP
Durham STP

DEQ originally provided the Final Tualatin Watershed TMDL in smaller size, separate appendices, as follows:
Separate Appendices
Appendix A* - Temperature Analysis
Appendix B - Bacteria Model
Appendix C - Chlorophyll and Phosphorus
Appendix D - Dissolved Oxygen Model (locked document)
Appendix E - pH
Appendix F - Fish
Appendix G - Toxics
Appendix H - Biological Criteria
Appendix I - Water Quality Management Plan (WQMP)

*LEA Disclaimer for compiled, unlocked and OCR documents: From time to time LEA will post on this website scanned documents, and additional documents otherwise limited in accessibility. Accordingly, LEA may use document unlocking and optical character recognition (OCR) capabilities to provide accessible, tagged text documents for use by people with visual impairments, and also provide searchable documents. The unlocking and OCR processes are not faultless, and hence LEA cannot guarantee document perfection. However, taking these caveats into account, document accessibility is greatly increased. LEA also posts the original document where necessary, as obtained by LEA, such that users may compare any potential imperfections in the unlocked and OCR documents.

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