PROPOSED REGIONAL GROUNDWATER REMEDIAL ACTION ROOSEVELT IRRIGATION DISTRICT June 11, 2010

1. PROPOSED REGIONAL GROUNDWATER REMEDIAL ACTION ROOSEVELT IRRIGATION DISTRICT June 11, 2010

2. AGENDA • Introduction of RID Project Team • Overview of RID Remediation Project • Communications/Web Site • Question & Answer

3. Roosevelt Irrigation DistrictRESPONSE ACTION TEAM • Stan Ashby – RID Superintendent • Synergy Environmental – Technical • Paul Hendricks – Water Development • Lawrence Moore – Public Outreach • Gallagher & Kennedy – Legal

4. Phase 1 Objectives ROOSEVELT IRRIGATION DISTRICT • Primary water supply from 52 wells in west Phoenix • Groundwater from this area has lower TDS than wells in RID Service Area • 31 wells are impacted or threatened by widespread groundwater contamination from “Superfund” site • Contamination caused by Volatile Organic Compounds

5. RID OBJECTIVES • Mitigate VOC impacts at RID Wells to allow unrestricted operations and maximize beneficial use of water supply • Protect human health and the environment by reducing exposure to VOCs • Prevent further groundwater quality degradation • Begin restoration of groundwater • Maximize use of existing infrastructure to fast track response actions

6. West Van Buren Remediation InvestigationDraft report genesis of RID remediation project One of the largest plumes of contaminated groundwater in U.S. Multiple sources of volatile organic compounds (VOCs) from numerous Potentially Responsible Parties are principal problem West Van Buren Area WQARF Site

7. Threatened Wells > 50,000 gpm Impacted Wells Pipe/Canal West Van Buren WQARF Site VOC PLUME OU-3 PRP/Source CONTAMINANT IMPACT ON RID WELLS Van Buren Avenue Van Buren Street

8. RID’s TWO-PHASE REMEDYCost-Effective Response Action • Provides a comprehensive and effective regional pump and treat remedy that maximizes existing RID infrastructure • Restores ~ 50,000 gallons per minute of impacted water supply • Early Response Action: pump and treat 10 most highly contaminated wells • Supplemental Response Action: identify best approach to address peripheral wells

9. WEST CENTRAL PHOENIX WQARF SITE Estimated Extent of VOC Contamination RID Salt Canal Van Buren Street WEST VAN BUREN AREA WQARF SITE ? ? ? ? ? ? • NEW TREATMENT FACILITY • Centralized Plant at RID Property • Treatment to Drinking Water Standards • Remove VOCs from Water and Air PRP/Source PLANNED EARLY RESPONSE ACTION 32 RID Wells in the Vicinity 21 RID Wells Contaminated by VOCs 17 RID Wells Exceed VOC Standards PUMP & TREAT ~20,000 gpm VOC MASS REMOVAL ~ 5,700 pounds/year

10. EARLY RESPONSE ACTIONKEY COMPONENTS • Tie-in and treat 10 most contaminated wells • Expediently mitigate public health exposures • Prioritize pumping to maximize response action benefit; no new pumping • Utilize existing infrastructure • Make essential upgrades to ensure safe and efficient long-term operations • Implement in 18 - 24 months

11. IN SUMMARY … • RID pumping is not optional • Current situation unacceptable • ADEQ lacks financial resources to implement groundwater remedy • Early Response Action will: • Restore and provide treated water to RID • Enhance the control, management, and cleanup of groundwater contamination • Protect public health and welfare

12. RID Water Right • Three governing agreements between RID and SRP in 1921, 1927, and 1950 • Deeded existing wells and land in Fee Simple • Contracts provide RID the “right” to pump groundwater for all beneficial uses into future • Limits pumping to 155,000 acre-feet year • Authority to convey water to RID service area codified in 1980 Groundwater Management Act

13. ROOSEVELT IRRIGATION DISTRICT PROJECT COMMUNICATIONS Lawrence E. Moore, Ph.D.

14. Stakeholder and Constituency Focus • Media Relations • Community Relations • Public Outreach

15. QUESTIONS?