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Exhibit MSD 66D - MSD Tunnel ProjectsMSD Major Tunnel Program Information based on Capital Improvement Replacement Program as of 04/16/2019 Project (MSD Project No.) Tunnel Length Tunnel Diameter FY Begin ConstructionConstruction Duration Construction Cost Estimate *Actual Bid Price Maline Creek CSO Storage Facility* (11656) 2,700 ft.28 ft. 2016 5 years $83M* Deer Creek Sanitary Tunnel* (11731) 22,800 ft.19 ft. 2018 4 years $148M* Jefferson Barracks Tunnel* (11711) 17,800 ft.7 ft. 2017 4 years $63M* Lower & Middle River Des Peres Storage Tunnel (11820) 9 miles 30 ft. 2027 6 years $640M Lower Meramec Tunnel (11746) 6.8 miles8 ft. 2021 4 years $212M River Des Peres Tributaries CSO Tunnel (12441) 12,144 ft.20 ft. 2029 7 years $412M Upper River Des Peres CSO Storage Tunnel (12440)8,976 ft.24 ft. 2032 7 years $287M   ")" ")" ")" ")" ")" ")" ")" LemayWWTP Fenton WWTP Coldwater CreekWWTP Grand GlaizeWWTP BissellPoint WWTP Lower MeramecWWTP Missouri RiverWWTP LMRDP CSO STORAGE TUNNEL RDP TRIBUTARIES (DEER CREEK)CSO TUNNEL UPPER RDP CSOSTORAGE TUNNEL DEER CREEK SANITARY TUNNEL LOWER MERAMEC RIVER SYSTEM IMPROVEMENTS -BAUMGARTNER TO FENTON WWTF TUNNEL MALINE CREEK CSO 052STORAGE FACILITY JEFFERSON BARRACKS TUNNEL §¨¦ 44 §¨¦ 55 §¨¦ 64 §¨¦270 §¨¦255 §¨¦ 64 §¨¦ 44 §¨¦270 §¨¦ 70 §¨¦ 70 §¨¦170 ¶ The Metropolitan St. Louis Sewer District SCALE: NTS Major Tunnels DATE: 04/16/2019 Legend ")"WWTP CSO Project SSO Project St. Louis City St. Louis County MSD Boundary 0 5 10Miles