nibw superfund site integration of groundwater extraction with a superfund remedy

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Page 1: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy
Page 2: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

NIBW Superfund Site

Integration of Groundwater Extraction

with a Superfund Remedy

Page 3: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

What is the NIBW Site?

Deep, alluvial groundwater basin8 square mile site in urban settingExtensive groundwater contamination in

multiple units with complex hydrogeologyListed on NPL in 1983 with EPA lead Multiple PRPs, regulators, water providers

and other stakeholders

Page 4: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

CamelbackMountain

PapagoButtes

Sc

ott

sd

ale

Ro

ad

Pim

a R

oa

d

Chaparral Road

ProductionWells

Page 5: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

CamelbackMountain

PapagoButtes

Sc

ott

sd

ale

Ro

ad

Pim

a R

oa

d

Chaparral Road

Motorola

Siemens

MRTF

CGTF

RemediationActivities

Page 6: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

NIBW Area “Facts of Life”

Many groundwater producers/users Conflicting water rights and competing interestsHistorical pumping for drinking water and

irrigation usesWide-spread groundwater depletion and

inorganic impactsContaminant occurrence/movement a result of

groundwater pumping and wells

Page 7: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Integrating Remediation with Groundwater Resource Management

Partner with groundwater users Utilize existing wells, infrastructure, and groundwater

pumping Coordinate groundwater extraction for optimum plume

management Build-in versatility of treatment systems to meet needs of

water users and their demands Manage other water resource issues

Wide-spread groundwater depletion and inorganic impacts

Page 8: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Big 3 Groundwater Producers

City of Scottsdale Local water provider for municipal end use Tied into OU-1 Remedy (required to pump > 6,300 gpm)

Paradise Valley Water Company (AAWC) Local water provider for municipal end use Small private water company owned by AWWSC Well field north of Site is main source ( > 12,000 gpm capacity)

Salt River Project Regional water provider for municipal/agricultural end use Export groundwater from Scottsdale to West Valley Impacted water supply wells ( > 6,000 gpm capacity) augment

surface water supply

Page 9: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

COS Pump and Treat System

Expanded pump and treatment capacity to meet demands

Conducted detailed evaluation of fluid flow and contaminant distribution in production wells

Replaced existing well for enhanced LAU mass capture

Prioritized well pumping/increased monitoring frequency

Upgraded treatment system to facilitate use of priority wells and assure safe drinking water

Aided evaluation of nitrate and hardness impacts

Page 10: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Central Groundwater Treatment Facility (CGTF)

5 existing supply wells 9,450 gpm capacity 3 phases of plant

modifications: 1995/98/00 Potable water source 10+ MGD treatment 4,000 + lbs/year TCE

removal

Page 11: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Paradise Valley Initiative

Public/private partnershipPhased construction decision processDetailed hydrogeologic characterization

tied to remedial designConstruction on accelerated scheduleActive community participation

Page 12: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Arizona-American Water CompanyMiller Road Treatment Facility

6,300 gpm capacityVersatile piping, plant

operations, controls, and discharge

Potable water to PVWC and SRP

Unique cooperation and water exchange

Page 13: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Salt River Project Agreement

Provided water supply via NIBW and M52 remedy to replace impacted wells NIBW Pump and Treat Systems (4,000 gpm) OU-2 Pump and Treat System (~ 5,400 gpm)

Prioritize well use to achieve better capture/minimize impacts to clean wells

Achieves reduced pumping in NIBW and reliable end use at M52

Page 14: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Northern LAU Plume Management

Focused/consistent groundwater extraction for greatest mass capture

Optimize use of treatment system to meet variable demands

Reduced pumpage of clean wells outside the plume to minimize impacts and assure containment

Allows conjunctive use of surface water to reduce groundwater pumpage of basin

Page 15: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy
Page 16: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

LegendAAWC Wells

COS Wells

SRP Wells

AWC Wells

Indian School Road

Camelback Road

Chaparral Road

Pim

a R

oa

d

Sc

ott

sd

ale

Ro

ad

McDonald Road

LAUPLUME

Northern LAU Plume

Containment

Page 17: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

LegendAAWC Wells

COS Wells

SRP Wells

AWC Wells

Indian School Road

Camelback Road

Chaparral Road

Pim

a R

oa

d

Sc

ott

sd

ale

Ro

ad

McDonald Road

COS-75A LAU Only

COS-75Abandoned

PCX-1LAU Only

Miller RoadMiller RoadTreatmentTreatment

FacilityFacility

Page 18: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

PVWC Water Supply

MRTF

PVWCEnd UseWells

PVWC

PVWCCAP Water3,200 AF/yr

9,600 AF/yrCapacity

10,600 AF/yr(6 wells)

Page 19: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

PVWC/SRP Water Exchange

MRTF

PVWCEnd UseWells

PVWC

PVWCCAP Water3,200 AF/yr

9,600 AF/yrCapacityPCX-1

(SRP Well)3,200 AF/yr

SRPEnd Use

10,600 AF/yr

1,000 KAF/yr

Page 20: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

CAP/PCX-1 Water Exchange

MRTF

PVWCEnd UseWells

PVWC

PVWCCAP Water3,200 AF/yr

9,600 AF/yrCapacityPCX-1

(SRP Well)3,200 AF/yr

SRPEnd Use

10,600 AF/yr

1,000 KAF/yr

(Reduced pumping)

(via Interconnect Facility)

Page 21: NIBW Superfund Site Integration of Groundwater Extraction with a Superfund Remedy

Lessons Learned

Cooperation and coordination with all Stakeholders is essential

Expedite source control actionsEnd-use issues are critical Solutions require long-term vision Build-in versatility and flexibility Groundwater resource management must drive

the remedy