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.
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).