Massachusetts Water Resources Authority

Massachusetts Water Resources Authority

Deer Island Operations MGD 800 700 600 500 400 300 200 100 0 Plant Flow & Precipitation J A S O N D J F M A M J 14 12 10 8 6 4 2 0 Inches (Water Equivalent) Total Plant Flow, MGD 12 Yr Avg Flow, MGD Total Precipitation, inches rain 12 Yr Avg Precipitation, inches rain 3

Deer Island Yearly Maintenance Metrics Replacement Asset Value / Maintenance Technician Replacement Asset Value in Millions S/Technician 20.0 15.0 10.0 5.0 0.0 FY04 FY05 FY06 FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 Best in Class Target = $8 to $10 Million 4

Water Distribution System Pipelines 300 Miles Surveyed for Leaks 250 200 150 100 50 0 J A S O N D J F M A M J Monthly Cumulative Target

Water Distribution System Valves 1500 Main Line Valves Exercised 1250 Target = 92 valves monthly or 1,100 annually 1000 # of valves 750 500 250 0 July August September October November December January February March April May June Operable Percentage Type of Valve Inventory # FY14 to Date FY14 Targets Main Line Valves 2,092 97.7% 95% Blow-Off Valves 1,206 95.1% 95% Air Release Valves 1,335 93.1% 95% Control Valves 48 100.0% 95% 6

Wastewater Pipeline and Structure Inspections and Maintenance 120 Inverted Siphon Cleaning YTD Actual 100 # of Siphon Barrels 80 60 40 Target = 3 monthly or 36 / 33% of the system annually Miles 40 35 30 25 20 Pipeline Cleaning Target = 3 miles monthly or 36 miles annually YTD Actual 15 20 10 0 5 J A S O N D J 0 F M A M J J A S O N D J F M A M J Monthly Cleaning Hydraulic Cleaning Mechanical Cleaning 7

Renewable Energy at MWRA Savings and Revenue, $ Savings and Revenue Totals for Renewable Energy Production, FY14 J A S O N D J F M A M J Solar Wind Hydro Steam Renewable Energy Certificates Value, $ Renewable Energy Certificates (RECs) Values, FY14 J A S O N D J F M A M J Steam Hydro Wind Solar 8

Workforce Management Positions Filled by Hires/Promotions FY14-YTD Filled Position Tracking Promotions / Transfers (111) 1250 1230 69% 31% 1210 Hires (51) 1190 1170 1150 J A S O N D J F M A M J Target Filled Pr/Trns Hires Total FY11 48 (62%) 30 (38%) 78 FY12 42 (61%) 27 (39%) 69 FY13 82 (64%) 47 (36%) 129 FY14 111 (69%) 51 (31%) 162 9

Massachusetts Water Resources Authority Presentation to the Board of Directors Existing and Future Combined Heat and Power (CHP) at DITP September 17, 2014

DITP A Significant Energy User 175,000,000 Total DITP Annual Power Demand, kwh 170,000,000 165,000,000 160,000,000 155,000,000 150,000,000 145,000,000 140,000,000 135,000,000 130,000,000 FY03 FY04 FY05 FY06 FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 Staff efforts have helped reduced plant electrical demand by 10% Process Optimization Installation of new energy efficient equipment 12

DITP Green Energy Production (FY14) 40,000,000 Total On- Site Renewable Electrical Energy Produc@on, kwh 35,000,000 30,000,000 25,000,000 20,000,000 15,000,000 10,000,000 5,000,000 Generation Assets: Digas STG/BPSTG 25.1 M kwh 17.4% Hydro Power 5.89 M kwh 4.1% Wind Power 1.48 M kwh 1.0% Solar 0.86 M kwh 0.6% 0 FY03 FY04 FY05 FY06 FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 Renewable energy from Digas Renewable Energy from other sources Maximizing On-Site Green Energy Production is a priority for MWRA 23% of DITP s total electricity demand met by green energy 60% of DITP s energy needs (heat + power) met by Digester Gas (62.5% for all) 13

DITP Digester Gas Generation & Use (FY14) On-site Thermal Power Plant Anaerobic Digester Complex Digas Generation Anaerobic Digestion: 240 dtpd solid in, 100 dtpd to FRSA for pellet conversion Digas generated on average is 60% methane OSTPP: Bottom-Cycle Generation Digas 95% utilized 95% of heat demand met by Digas ($17.6 million annually) (remainder by Fuel Oil) 25.1 M kwh generation from Steam Turbine ($2.4 million annually) 14

Combined Heat & Power Process Currently Used by DITP Bottom Cycle Generation Heat First 60% efficient Generate Steam then Hot Water Power Second 9% efficient Generate Electricity from Steam New BPSTG / Steam Bypass Valve improves steam to electricity conversion process by extracting more heat per unit steam 15

Combined Heat & Power Process Improved Performance STG Power Output (MW) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 STG Power Output vs. Steam Flow (STG Boiler 101 with BP- STG) 1.5 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 Steam Flow (KLB/HR) OperaKng in a vacuum Not operakng in a vacuum y = 0.0706x - 0.6165 R² = 0.97744 y = 0.0729x - 1.9051 R² = 0.99959 New BPSTG / Steam Bypass Valve improve steam to electricity conversion process 18% improvement (10.6% efficiency overall) +1.3 MW increase in generation from steam generators Sustainable May - November Should see an increase of +4.5 M kwh / year ~30 M kwh total/year from steam (25.1 M kwh currently) 16

CHP Study Objectives CDM Smith Residuals Technology Assessment Develop engineering and economics for new CHP Compare and recommend more efficient generation technologies Internal Combustion Engines Gas Turbines Develop Simple Payback Analysis / Economic benefits Evaluate implementation options 17

Internal Combustion Engines versus Gas Turbines Exhaust emissions (NOx, CO) GT Space required (Capacity) GT Capital and operating costs GT Energy efficiency (Electricity and Heat) Flexibility GT 18

CHP Technology Change CHP Technology Change Change from Bottom to Top cycle generation Improve efficiency Increased electrical production Better use of all digas - summer months Continue to meet plant heating needs CHP Benefit from Co Digestion Expected 29-42% increase in biogas Results in more electrical output Heat demand increase 5-10% Electrical demand increase <2% 19

Cost Benefit Analysis Simple Payback Payback Without and With Co-Digestion Parameter OSTPP with 1 Gas Turbine* OSTPP with 1 Gas Turbine* With Codigestion 3 Gas Turbines* 3 Gas Turbines* With Codigestion Capital Cost $24.9 M $24.9 M $75.0 M $75.0 M Annual O&M Cost $2.2 M/yr $2.2 M/yr $1.6 M/yr $1.6 M/yr Annual Electrical Savings $5.2 M/yr $7.0 M/yr $11.4 M/yr $14.7 M/yr Net Annual Savings $3.0 M/yr $4.8 M/yr $9.8 M/yr $13.1 M/yr Simple Payback Period 8 years 5 years 8 years 6 years Single Gas Turbine capacity: 4.6 MW Payback does not include potential funding for green energy projects to pay for the capital. 20

Potential Energy Benefit with CHP Existing Thermal Plant 23% green generation* (18% w/digas) 75% purchased electricity CHP with 3 Gas Turbines Co-Digestion Can reverse energy profile More sustainable 77% green generation* (72% w/digas) 21% purchased electricity *Note: 1.5% generation by CTG backup power. 21

Recommendation Gas Turbine CHP is recommended technology Staff will move forward with design to Confirm economics Investigate additional equipment needed Review economics with and without co-digestion Confirm full implementation approach Develop specific gas system changes Develop plans and specs for bidding new CHP 22

Massachusetts Water Resources Authority Presentation to the Board of Directors Struvite, Scum, Sludge, and Grit Removal Contract September 17, 2014

Struvite Removal Cause Struvite forms a pipe scale and consists of phosphate, ammonia, and magnesium Struvite coats digested sludge pipelines Digester overflow box piping Centrifuge piping Difficult to remove PrevenKon Ferric chloride added to control RemediaKon Specialized equipment and services in confined spaces needed for removal 25

Scum, Sludge and Grit Removal Removal of severe blockages beyond in house capability in: Gravity thickeners Primary clarifiers Influent channels Scum receiving wells Vactor trucks and boxes used Off site material disposal 26

Massachusetts Water Resources Authority Presentation to the Board of Directors Deer Island Clarifier Rehabilitation Contract 7394 September 17, 2014

Deer Island Stacked Clarifiers

Condition of Concrete

Massachusetts Water Resources Authority Presentation to the Board of Directors Beacon Street Line: Water Pipeline Repair Contract 7474 September 17, 2014

Beacon Street Line - Brookline 48-inch cement mortar lined castiron pipe Constructed in the 1870sIt is part of MWRA s Boston Low Service System A significant portion of it is located underneath the MBTA s Beacon Street Green Line tracks The Beacon Street Line provides important the Longwood Medical area 33

Beacon Street Line - Brookline

Beacon Street Line - Brookline

Location of Access Pits CFRP InstallaKon

Massachusetts Water Resources Authority Presentation to the Board of Directors Spot Pond Water Storage Facility Contract 6457, Change Order 7 September 17, 2014

Spot Pond Tank and Ravine Road Piping

Remove Ledge to Install 36-Inch Pipelines and Valve Vaults at Ravine Road

Remove 87 Linear Feet of 16-Inch-Diameter, Cast-Iron Water Main and Replace with Restrained-Joint, Ductile-Iron Pipe

Current Progress

Massachusetts Water Resources Authority Presentation to the Board of Directors Gillis Pump Station Short-Term Improvements Contract 7260, Change Order 3 September 17, 2014

Additional Valve Work

Ledge Croppings Inside Excavated Pit

Selector Switch for Three VFD Bypasses