1 | emwd.org AquaSel Brine Concentration Demonstration Project Khos Ghaderi, P.E. May 18, 2016

2 | emwd.org Background Pilot Study of the AquaSel Brine Concentration Technology was completed in August 2015 AquaSel is a proprietary process by GE which uses Electrodialysis Reversal (EDR) and a precipitator Tested 10 gallons per minute (gpm) pilot plant Pilot testing was conducted over a nine-month period (1,890 hours of run time)

3 | emwd.org Summary of Pilot Study Findings Demonstrated success processing EMWD’s brine The pilot identified some areas that require optimization – Precipitator process and sizing – Filtration of the recirculated feed to the EDR – Hydraulic flow balance – Miscellaneous electrical systems and instrumentation systems Average TDS of pilot plant product water was approximately 1,900 mg/L – Compatible with raw well water for blending – May be used as potable water if desalted

4 | emwd.org Configuration of Existing Desalters

5 | emwd.org Proposed Configuration with Perris II Desalter

6 | emwd.org Product Water Utilization Alternatives Alternative 1 – Blend with Desalter Product “New” Water, AFY618 AF Product TDS670 mg/l X X

7 | emwd.org Product Water Utilization Alternatives (cont’d) Alternative 2 – Add Secondary EDR “New” Water, AFY1,828 AF Product TDS560 mg/l

8 | emwd.org Product Water Utilization Alternatives (cont’d) Alternative 3 – Blend with Perris II (RO) X “New” Water, AFY940 AF Product TDS650 mg/l

9 | emwd.org Product Water Utilization Alternatives (cont’d) Alternative 4 – Recycle to Feed Perris II (EDR) “New” Water, AFY2,291 AF Product TDS500 mg/l

10 | emwd.org Estimated Cost of Water (1)Based on 15-year duration (2)Relieved capacity amortized over 30 years at 5 percent Base Case Menifee, Perris I & Perris II Alternative 1 Direct Blending Alternative 2 New Secondary EDR Alternative 3 Blend with Perris II RO Alternative 4 Feed to Perris II EDR “New” Water, AFY-6181, ,291 Total Annual Cost$5,026,000$6,270,000$5,026,000$6,439,000 Unit Cost of “New” Water, $/AF -$8,135$3,430$5,344$2,811 MWD (LRP), $/AF (1) - ($475) Reduction in Brine, $/AF (2) $1.03 M/yr($1,096)($231)($720)($344) Net Unit Cost of “New” Water, $/AF - $6,564$2,725$4,149$1,992 Unit Cost of all Water, $/AF (1) $1,294$1,383$1,371$1,356$1,346

11 | emwd.org Proposed Next Steps Conduct a larger AquaSel Demonstration Project: Validate the process at a larger scale utilizing one full-size AquaSel module Sized for 100 gpm 1/16 of a full-scale 2.3 mgd plant This demo unit will: Include full scale components Refine the design and sizing of the precipitator Utilize the same EDR stack as a full-scale plant Confirm the AquaSel process has been optimized for a full-scale plant Validate preliminary estimates for operating costs

12 | emwd.org AquaSel EDR Unit Demonstration project: 100 gpm Full plant: 1600 gpm (2.3 mgd) * Precipitator not shown 100 gpm

13 | emwd.org Grant Funding for AquaSel Demonstration Project Staff submitted a grant request to the U.S. Bureau of Reclamation (USBR) under the Desalination and Water Purification Research and Development program. o $400,000 over two USBR fiscal years o Grant application is pending. Staff anticipates award by September Senior Management met with USBR Management and staff to present findings of the pilot and discuss future collaboration.

14 | emwd.org Proposed Engineering Support Services Staff received a proposal for engineering services in support of the project from a combined team of CH2M and Carollo Engineers in the amount of $249,700. The consulting team provides the combined experience with the prior AquaSel pilot project, existing Desalters, and future Perris II Desalter. The team will also assist in negotiating with GE for the procurement of the equipment.

15 | emwd.org Consultant Scope of Work Assistance with negotiating for the equipment and services from GE. Preparation of the preliminary demonstration project protocol to ensure the design of the demonstration equipment will meet the project objectives. Preparation of a technical memorandum addressing permitting and regulatory issues using the proposed technology to concentrate brine. Assistance and support with seeking additional grant funding from the USBR and the State of California under Proposition 1. -USBR staff has indicated more funding may become available. Preparation of construction contract drawings and specifications.

16 | emwd.org Project Schedule Board Award of Consultant Agreement May 2016 GE Equipment Procurement July 2016 Preliminary Protocol Development July 2016 Complete 100-Percent Design September 2016 Advertisement of Construction October 2016 Board Award of Construction* November 2016 Begin Demonstration Period* February 2017 End Demonstration Period* June 2018 * Schedule dependent upon identifying and securing additional grant funding to support implementation of the demonstration project.

17 | emwd.org Recommendation Board approve and authorize the following: Execution by the General Manager, or his designee, of the District’s standard form of contract with CH2M for the design of the AquaSel Brine Concentration Demonstration Project; and Appropriation of $290,700 for CH2M and Carollo Engineering Services.

18 | emwd.org Contact Information Khos Ghaderi, P.E. Director of Water Operations (951) Ext