Irvine Ranch Water District Michelson Water Recycling Plant

Irvine Ranch Water District Michelson Water Recycling Plant Phase 2 Expansion SCAP Water Quality Committee Meeting Randy Lee, P. E. , Assistant Director of Recycling Operations September 23, 2014

Presentation Overview 1. IRWD Background 2. MWRP Existing Processes Overview 3. MWRP Phase II Expansion 4. Biosolids Project Status Update 1

IRWD Serves 20% of Orange County 2

About the Irvine Ranch Water District Water, Wastewater, Water Recycling, and Urban Runoff California Special District governed by a publicly-elected Board IRWD customer base: • Residential population: • Daytime population: • Service connections: 330, 000 >500, 000 102, 380 IRWD service area: • 181 square miles (20% of Orange County) • All or part of six cities and unincorporated county: Irvine Tustin Orange Lake Forest Newport Beach Costa Mesa 3

IRWD Services Drinking Water Sewage Collection Recycled Water Urban Runoff Treatment 4

Phase 2 Expansion Project C O E C AS t c e j o r P t n e m t a e r T r e t a W 3 1 0 2 r a e Y e of th 5

Michelson Water Recycling Plant • Produces 18 MGD of Title 22 recycled water. • Phase 2 Expansion increases capacity to 28 MGD. • Scheduled completion June 2014. 6

MWRP Aerial View

Michelson Water Recycling Plant Treatment Process Prior to Expansion FLOW EQUALIZATION BASINS NORTH IRVINE INTERCEPTOR PRIMARY SEDIMENTATION TANKS INFLUENT GRINDERS SOUTH IRVINE INTERCEPTOR SECONDARY ACTIVATED SEDIMENTATION TANKS SLUDGE BASINS DUAL MEDIA FILTERS CHLORINE CONTACT TANKS RECYCLED WATER CUSTOMERS OCSD 8

Phase 2 Overall Process Train FLOW EQUALIZATION BASINS DUAL MEDIA FILTERS SECONDARY ACTIVATED SEDIMENTATION SLUDGE BASINS TANKS NORTH IRVINE INTERCEPTOR SOUTH IRVINE INTERCEPTOR RW CUST. HIGH RATE CLARIFIER PRIMARY SEDIMENTATION TANKS HEADWORKS CHLORINE CONTACT TANKS PRIMARY EFFLUENT PUMP STATION MEMBRANE BIOREACTOR UV DISINFECTION OCSD 9

Phase 2 Expansion Overview NEW TREATMENT FACILITIES MODIFIED EXISTING TREATMENT FACILITIES NEW CHEMICAL FACILITIES FLOW EQUALIZATION BASINS NEW ELECTRICAL FACILITIES EXISTING BLOWER ROOM HIGH RATE CLARIFIER MEMBRANE BIOREACTOR UV DISINFECTION PEPS SPENT BACKW EXISTING PSTs NEW PSTs SPENT BACKW ASH TANK HEADWORKS CHLORINE CONTACT TAN EFFLUENT PUMPS ` K 10

New Headworks 11

New Primary Sedimentation Tanks 12

New Primary Effluent Pump Station 13

AERATION BASIN ANOXIC ZONE ML RAS P. S. BOX MEMBRANE TANKS DE-OX ZONE BLOWER ROOM FINE SCREENS DE-OX ZONE RAS CHANNEL ANOXIC ZONE PERMEATE PUMP RO OM Membrane Bioreactor DIP B. P. TANK 14

MBR Process Flow 30 MGD 5 MGD 10 MGD 30 MGD 15

MBR Fine Screens & Aeration Basins 16

MBR Mixed Liquor Pump Station 17

Loading MBR Membrane Cassettes 18

MBR Air & Permeate Piping 19

Permeate Pump & Blower Rooms 20

MBR Photos 21

Ultraviolet Disinfection Facility 22

New Phase 2 Buildings Headworks High Rate Clarifier Membrane Bioreactor Electrical Bldg. 23

MWRP Phase 2 Overview 24

Floodwall – 200 Yr Flood Protection 25

Phase 2 Construction Cost Treatment Process $83 Million Floodwall $ 5 Million Overall Construction Cost: $88 Million Change Orders: $ 4 Million 4. 5% Total $92 Million Construction Management $14 Million 15% 26

Biosolids & Energy Recovery Facilities Project 27

Biosolids & Energy Recovery Project Objectives • Beneficially reuse Biosolids and Biogas produced during the treatment process. • Manage residuals (Biosolids) at reduced costs to IRWD’s customers. • Construct project to meet IRWD’s future Biosolids handling needs. • Minimize environmental impacts: Drying and pelletizing reduces export truck loads by factor of four. • Reduces greenhouse gas effects by beneficially using pellets locally as a fertilizer or e-fuel. 28

Biosolids & Energy Recovery Project Description • IRWD to construct facilities at MWRP for: • Biosolids digestion, dewatering and drying • Biogas management and energy recovery • Odor control systems • IRWD would no longer export solids to Orange County Sanitation District (OCSD). • Project would also accept Biosolids trucked in from IRWD’s Los Alisos Water Recycling Plant (LAWRP). 29

Biosolids Facilities Site Location MWRP Biosolids and Energy Recovery Facilities 30

Simplified Process Schematic DIGESTER GAS CLEANING FATS, OILS & GREASE EXISTING PRIMARY CLARIFIER MICROTURBINES BIOGAS ELECTRICITY DEWATERING CENTRIFUGE THICKENING CENTRIFUGE ROTARY DRUM DRYER PELLET STORAGE & LOADOUT PS EXISTING SECONDARY CLARIFIER THICKENING CENTRIFUGE ACID-METHANE PHASE ANAEROBIC DIGESTION DIGESTED SLUDGE STORAGE CAKE STORAGE & LOADOUT CLASS A PELLET HAUL WAS RECYCLED WATER TO LIQUID TREATMENT CENTRATE TREATMENT CLASS B CAKE HAUL (BACKUP) 31

Air Permit Process Diagram 32 32

Heat Drying System Preseparator Baghouse Venturi Scrubber Gas Recirculation Pellet Cooler Triple Pass Drying Drum Furnace Pneumatic Transporter Furnace Condenser ID Fan To Storage Silos Cake from dewatering Atmosphere Cake Bin Mixer Recycle Bin RTO 33

Heat Drying System • Produces a pellet suitable for local beneficial reuse • Nitrogen for fertilizer • Btu content for e-fuel • Dryers in CA: • Encina (Carlsbad) • Sacramento • Corona 34

3 -D Model Renderings 35

Digestion Facilities Egg-Shaped Digesters Sludge Holding Tanks Digester Control Bldg. Acid Phase Digesters FOG Foodwaste Receiving. 36 36

Biosolids Handling Building Dryer and Odor Control Discharge Stacks Polymer Storage Solids Receiving Pellet Loadout 37

Biosolids Handling Building Dryer Area Centrifuge Area Polymer Storage Centrate Treatment 38 38

Biogas Treatment & Microturbines Biogas Storage Biogas Conditioning Microturbines 39

Centrifuge Room Thickening Centrifuges Dewatering Centrifuges 40 40

Dryer System – Lower Level Pellet Screen Dryer Drum 41 41

Dryer System – Upper Level Solids/Off Gas Separation Recycle Bin Pellet Mixer Dryer Drum 42 42

Sub-Surface View of 3, 028 Piles 43

Construction Photos 44

Construction Photos Pile Installation – Digester Area • Completed: Construction of structure and 45

Construction Photos Pile Installation – Basement of Solids Handling Building 46

May 2014 Quarterly Report Installation of Piles in Methane Digester Area 47

May 2014 Quarterly Report Installation of Piles in Solids Handling Facility 48

Project Schedule 49

Project Schedule DATE ACTIVITY April 29, 2013 Notice of Award June 3, 2013 Notice to Proceed Sept. 2013 – March 2014 Pile Driving January 17, 2016 Anaerobic Digestion Facilities Online March 2, 2016 Produce Class B Biosolids (Cake) June 30, 2016 Microturbine Power Generation Online August 29, 2016 Produce Class A Biosolids (Pellets) October 28, 2016 Project Completion 50

Biosolids Construction Cost Pile Driving $ 10 Million 6% Digesters $ 45 28% Dryer $ 13 8% Biogas & Microturbines $ 8 5% Sitework $ 14 9% Other $ 73 45% Total Bid Amount $ 163 Million 51

Contact Information: Randy Lee, P. E. Irvine Ranch Water District leer@irwd. com 949 -453 -5780