PROPOSED REGIONAL GROUNDWATER REMEDIAL ACTION ROOSEVELT IRRIGATION DISTRICT

June 11, 2010

AGENDA Introduction of RID Project Team Overview of RID Remediation

Project Communications/Web Site Question & Answer

Roosevelt Irrigation DistrictRESPONSE ACTION TEAM

Stan Ashby – RID Superintendent Synergy Environmental – Technical Paul Hendricks – Water Development Lawrence Moore – Public Outreach Gallagher & Kennedy – Legal

Phase 1 Objectives

• 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

ROOSEVELT IRRIGATION DISTRICT

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

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 AreaWest Van Buren AreaWQARF SiteWQARF Site

CONTAMINANT IMPACT ON RID WELLS

West Van BurenWQARF Site

Van Buren Avenue

VOC PLUME

PRP/Source

OU-3

> 50,000 gpm

Van Buren Street

Threatened WellsImpacted Wells

Pipe/Canal

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

WESTCENTRALPHOENIX

WQARF SITE

WEST VAN BUREN AREA WQARF SITE

PRP/Source

Van Buren Street

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Estimated Extent of VOC Contamination

PLANNED EARLY RESPONSE ACTION

32 RID Wells in the Vicinity21 RID Wells Contaminated by VOCs17 RID Wells Exceed VOC Standards

RID Salt Canal

NEW TREATMENT FACILITY• Centralized Plant at RID Property• Treatment to Drinking Water Standards• Remove VOCs from Water and Air

PUMP & TREAT ~20,000 gpmVOC MASS REMOVAL ~ 5,700 pounds/year

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

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

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

ROOSEVELT IRRIGATION DISTRICT

PROJECT COMMUNICATIONS

Lawrence E. Moore, Ph.D.

Stakeholder and Constituency

Focus

Media Relations Community

Relations Public Outreach

QUESTIONS?