Amendment No 1 to PSA - Adding Full CSO Storage Tank Proj No. 121-071 – American Structurepoint, Inc. - TABLED

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OPINION OF PROBABLE PROJECT COSTS SAGE PLAN Improvement 2020 SAGE Plan Base Construction ($ millions) With Construction Contingency ($ millions) With Contingency and Engineering ($ millions) WWTP Improvements WWTP Improvements Expansion of the South Bend WWTP to provide peak wet weather capacity of 100 mgd. Cost based on ARCADIS estimates. $ 18.94 $ 24.62 $ 29.55 Storage Facilities WWTP Storage, Site Piping and Controls Equalization basin and dewatering pumping station. Construction Contingency = 20% based on expanded conceptual design. $ 19.32 $ 23.18 $ 27.82 Re-routing of existing sewers to accommodate proposed equalization basin. $ 0.66 $ 0.86 $ 1.03 Brownfield Storage Tank Below grade retention treatment basin and pumping station with RTC gate and provisions for screening, disinfection/dechlorination of overflow. Cost based on storage cost curve. 30% construction contingency applied given lack of conceptual design details $ 19.32 $ 25.11 $ 30.13 Memorial Park RTB Below grade retention treatment basin and pumping station with provisions for screening, disinfection/dechlorination of overflow. Cost based on storage cost curve plus allowance for effluent pump station. $ 37.72 $ 45.26 $ 54.32 Memorial Park Consolidation Sewers and Controls Large diameter sewers to collect and convey overflow from CSO Basins 031, 033, 035, 036, 037 to Memorial Park RTB; Segment from CSO 037 to tank increased to 78" diameter (2625 lf). $ 16.24 $ 21.11 $ 25.33 Randolph-Sampson RTB and Site Piping Below grade retention treatment basin and pumping station with provisions for screening, disinfection/dechlorination of overflow. Construction Contingency = 20% based on expanded conceptual design $ 33.76 $ 40.51 $ 48.62 90" diameter inlet and outlet sewers for Randolph-Sampson RTB $ 0.53 $ 0.69 $ 0.82 Conveyance Facilities South Shore Interconnect Sewer 84" diameter interconnecting sewer from Michigan St LS to downstream end of River Crossing #5. Collects overflow from CSO Basins 006, 007, 008, 010, 011 and allows River Crossing #4 and the Michigan Street LS to be abandoned. $ 18.80 $ 24.44 $ 29.33 River Crossing 2-3 Interconnect Sewer 36" diameter interconnecting sewer (reduced from 66") between CSO 14 and River Crossing #2 serving as both conveyance and storage $ 3.20 $ 4.16 $ 5.00 Interceptor Replacement 24" diameter replacement for existing interceptor from CSO 020 to CSO 019 (1,800 lf) $ 1.22 $ 1.59 $ 1.90 New River Crossing 48" diameter wet weather river crossing (500 lf) to direct excess flow from south side of river to Memorial Park RTB; Use cost curve. $ 5.50 $ 7.15 $ 8.58 Interceptor Active Controls Interceptor Control Upstream of River Crossing #2 Actively controlled interceptor isolation gate to regulate flow downstream and detain excess in Memorial Park RTB $ 0.16 $ 0.21 $ 0.25 Sluice Gate at CSO 18 Regulator Structure Actively controlled modulating sluice gate operated to make effective use of storage in Basin 018 trunk sewer $ 0.16 $ 0.21 $ 0.25 Throttle Control at CSO 022 Actively controlled sluice gate on capture throttle to prevent overflows at CSO 48 near River Crossing #1 $ 0.16 $ 0.21 $ 0.25 Local Collection System Capacity Basin CSO 040, 041 Separation Sewer 15" new storm sewer (975 lf), 18" new storm sewer (650 lf), 24" new storm sewer (650 lf) on Pleasant Avenue; 24" new storm sewer (700 lf) on Northside Blvd. $ 1.80 $ 2.34 $ 2.81 Regulator and Throttle Modifications CSO 001 Throttle Capacity Improvement Increase dry weather throttle pipe capacity $ 0.04 $ 0.05 $ 0.06 CSO 010 Throttle Capacity Improvement Increase throttle pipe capacity to maximize diversion to South Shore Interconnect Sewer (550 lf of 36" diameter sewer, 775 lf of 27" diameter sewer), Construct new diversion structure at Michigan St and Bartlett St $ 1.07 $ 1.39 $ 1.67 CSO 011 Regulator Improvements and Diversion Sewer CSO 011 regulator modifications, weir adjustments, and 27" diameter relief sewer (2,250 lf) from intra-system diversion structure on 60" trunk sewer upstream of existing CSO 011B location to Michigan St and Bartlett St $ 1.90 $ 2.47 $ 3.21 CSO 019 Throttle Capacity Improvement Increase throttle pipe capacity to maximize diversion to South Shore Interconnect Sewer (650 lf of 24" diameter sewer) $ 0.44 $ 0.57 $ 0.69 Regulator Modifications for Memorial Park Consolidation Sewer Modifications to regulators for CSO 031, 033, 035, 036, 037, 060 $ 0.10 $ 0.12 $ 0.15 Regulator Modifications for Randolph- Sampson RTB Modification to regulator at CSO 022 $ 0.06 $ 0.08 $ 0.10 Regulator/Throttle Improvements Downstream of East Race Modifications to regulators/throttles at CSOs 003, 004, 006, 007, 025, 026, 027, 028 $ 0.13 $ 0.17 $ 0.20 CSO 029 Lift Station Modification Increase lift station capacity to 250 gpm (0.55 mgd) $ 0.50 $ 0.65 $ 0.85 Regulator/Throttle Improvements Upstream of East Race Modifications to regulators/throttles at CSOs 014, 018, 021, 040 $ 0.06 $ 0.08 $ 0.10 Green Stormwater Infrastructure CSO Basin 010 GSI Improvements Sewer Separation, Green Alley Improvements, Rain Barrel Program $ 0.65 $ 0.84 $ 1.01 CSO Basin 019 GSI Improvements Green Alley Improvements, Intersection Dry Wells $ 0.67 $ 0.88 $ 1.05 CSO Basin 039, 040 GSI Improvements GSI unit drain improvements along Pleasant Avenue $ 0.50 $ 0.65 $ 0.85 2020 SAGE Plan $ 275.91