1. Paul Cook Irvine Ranch Water District General Manager February 21, 2013 Shared Services: Baker Water Treatment Plant

2. Background on IRWD

3. 3 Water, Wastewater, Water Recycling, Urban Runoff California Special District governed by a publicly-elected Board IRWD customer base: Residential population: 350,000 Daytime population: over 500,000 Service connections: 102,381 IRWD service area: 181 square miles (20% of Orange County) All or part of six cities and unincorporated county: About Irvine Ranch Water District Irvine Tustin Orange Lake Forest Newport Beach Costa Mesa

4. IRWD services and system statistics: Potable Water: Three treatment plants, 25 wells, 1,500 miles of pipelines Wastewater: Nearly 1,000 miles of sewage collection pipelines Recycled Water: Two water recycling facilities (28 MGD + 5.5 MGD) and approximately 500 miles of recycled water pipelines Urban Runoff Treatment: The San Joaquin Marsh and 31 built and planned man-made wetland treatment sites About the Irvine Ranch Water District

5. IRWD Shared Services

6. Baker Water Treatment Plant

7. Project Objectives: Baker Water Treatment Plant 1.Improve potable water supply reliability for southern Orange County by constructing a local regional water treatment facility. 2.Collaborate with multiple retail water agencies to optimize treatment capacity and conveyance. 3.Design facility to treat raw water from three sources, blended or as individual sources. 4.Utilize modern treatment technology to produce water that meets standards stricter than current regulatory requirements. 5.Minimize waste by operating plant at greater than 99% recovery efficiency. Advanced water treatment facility with microfiltration membranes, UV disinfection, and chloramines for residual disinfection

8. Diemer Plant Santiago Lateral Lower Feeder Irvine Lake AMP Baker Pipeline Baker Plant Site Lake Mathews South County Pipeline South OC Regional Imported Water Distribution System Why this project? Optimize available capacity in the Baker Pipeline. (43.5 cfs; 28,200 AFY; 63,300 homes) Why at IRWD? Utilize existing storage and conveyance facilities. IRWD operates other membrane treatment facilities. At what cost? Total cost estimate: $79 million. All-in cost: $898 per acre-foot. Baker Water Treatment Plant

9. AgencyFlow Rate, cfs (MGD) Capacity ETWD5.0 (3.2)11.5% IRWD10.5 (6.8)24.1% MNWD13.0 (8.4)29.9% SMWD13.0 (8.4)29.9% TCWD2.0 (1.3)4.6% TOTAL43.5 (28.1)100.0% Multi-agency project with six primary stakeholders Capacity Ownership Split: Baker Water Treatment Plant *MWDOC does not own capacity, but participated in the Feasibility Study and will facilitate the purchases of untreated water from the Metropolitan Water District. Moulton Niguel Water District

10. Site Is Part of Overall IRWD Baker Property

11. Project Site at Construction Completion 16 MG RESERVOIR PRODUCT WATER PUMP STATION CT BASIN

12. IRWD Contact Information Paul Cook IRWD General Manager Phone: (949) 435-5590 E-mail: cook@irwd.com www.irwd.com 12