SAFETY IS TVA’S NUMBER ONE PRIORITY DURING ANY FLUCTUATION OF LAKE LEVELS SIGNIFICANT FLUCTUATIONS IN THE LAKE LEVELS MAY BE EXPECTED DURING A PERIOD OF OBSERVATION AND EVALUATION PLANNED AT THE END OF WALL CONSTRUCTION THE OBSERVATION AND EVALUATION PERIOD WILL LAST FOR A MINIMUM OF ONE FULL CYCLE OF WINTER POOL LEVEL AND SUMMER POOL LEVEL TENNESSEE VALLEY AUTHORITY DIVISION OF LAND & RIVER MANAGEMENT DAM SAFETY SECTION

RESERVOIR OBSERVATION AND EVALUATION 2021 2022 1390 PERIOD OF OBSERVATION AND EVALUATION USUAL SUMMER POOL, APPROXIMATE ELEVATION 1382 1380 FLOOD OPERATING GUIDE CURVE BLUE-SHADED AREA SHOWS POTENTIAL PERIOD AND POTENTIAL RANGE OF LAKE LEVELS DURING RESERVOIR TESTING FOR OBSERVATION AND EVALUATION RESERVOIR POOL ELEVATION IN FEET 1370 USUAL WINTER POOL, APPROXIMATE ELEVATION 1362 1360 CURRENT POOL, APPROXIMATE ELEVATION RANGE 1350-1355 1350 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG EXPECTED COMPLETION OF CUTOFF WALL CONSTRUCTION MAY 2021 TENNESSEE VALLEY AUTHORITY DIVISION OF LAND & RIVER MANAGEMENT DAM SAFETY SECTION

VIEW UPSTREAM AT POOL ELEVATION OF 1382 (SUPERPOSED ON SITE CONDITIONS PRESENT SUMMER 2018) TOP OF UPSTREAM STABILITY BERM APPROX EL 1398 SLOPE “APRON” APPROX EL 1365 EL. 1382 TENNESSEE VALLEY AUTHORITY DIVISION OF LAND & RIVER MANAGEMENT DAM SAFETY SECTION

TENNESSEE VALLEY AUTHORITY Crest Restoration Cutoff Wall Upstream Stability Berm Downstream Stability Berm 2014 Sinkhole 1951 Grout Curtain Slurry-Containment Grouting Karst Limestone Foundation Rock Deep Bedrock Grouting Tailwater TENNESSEE VALLEY AUTHORITY DIVISION OF LAND & RIVER MANAGEMENT DAM SAFETY SECTION