Eastern LMRAP UAA Documents

Eastern Lower Mississippi River Alluvial Plains Ecoregion Use Attainability Analysis

On June 7, 2013 LDEQ completed a dissolved oxygen Use Attainability Analysis (UAA) in the eastern Lower Mississippi River Alluvial Plains (LMRAP) Ecoregion. A potpourri (1506POT1) will be noticed in the June 20, 2015 Louisiana Register to announce this UAA and the proposed updates to Volume 4 of the Water Quality Management Plan. Regulatory revisions (WQ091) resulting from this UAA are also being noticed in the June 20, 2015 Louisiana Register concurrent with the potpourri. 

• Use Attainability Analysis of Inland Rivers and Streams in the Eastern Lower Mississippi River Alluvial Plains Ecoregion for Review of Dissolved Oxygen Water Quality Criteria 

• Louisiana Water Quality Standards Ecoregions: For Use in Ecologically-Driven Water Quality Standards 

Proposed Updates to the Water Quality Management Plan, Volume 4: Basin and Subsegment Boundaries

• WQMP Volume 4: Basin and Subsegment Boundaries 
• WQMP Volume 4: Appendix A 
• Explanation of Subsegment Revisions in Lower Mississippi River Alluvial Plains, Southern Plains Terrace and Flatwoods, and Coastal Deltaic Marshes Ecoregions 

Final Updates to the eastern LMRAP UAA and WQMP, Volume 4

As a result of the eastern LMRAP UAA, LDEQ promulgated revisions to Table 3 in LAC 33:IX.1123 (Rule WQ091) on December 20, 2015 (Louisiana Register, http://www.doa.la.gov/osr/REG/1512/1512.pdf). LDEQ then submitted the final rule certification package to EPA Region 6 for approval (EDMS Document ID 10040577) on January 7, 2016. EPA Region 6 approved the final rule on June 3, 2016 (EDMS Document ID 10213910). Volume 4 of the Water Quality Management Plan (WQMP) was updated to reflect the revisions in WQ091, and the WQMP Volume 4 certification package (EDMS Document ID 10240321) was sent to EPA Region 6 on June 20, 2016; EPA Region 6 approved the update to Volume 4 of the WQMP on September 9, 2016 (EDMS Document ID 10346078).