Carmichael Town Hall Meeting

Western Groundwater Operable Unit - Update

12 March 2008

Alexander MacDonald (RWQCB)

916-464-4625

amacdonald@waterboards.ca.gov

Outline

• Background and Regulatory Perspective

• 2004 Plume in Carmichael

• Contaminant Plumes in 2008

• Work Completed Since 2004

• The Big Picture

Aerojet

Intersta

te 80

US 50

Sun

rise

Bou

leva

rd

American RiverSacramento

Interstate 99

Background

• Aerojet - Superfund Cleanup Site -1982

• Oversight Provided by State and USEPA

• Past Operations Led to Soil and Groundwater Pollution

• Primary Focus – Off-site Groundwater

• Western Groundwater Operable Unit

Aerojet

IRCTS

Western GroundwaterOperable Unit

Area 4

Area 3

Area 1

Area 2

N

Contaminants of Concern

• Solvents - TCE, PCE, Freon, Chloroform

• Perchlorate – component of solid rocket propellant

• N-nitrosodimethyhylamine (NDMA) – associated with liquid rocket fuel

NDMA

• Found in Hydrazine-Based Rocket Fuel

• Found in hotdogs, smoked/cured meats, malted beverages, and tobacco

• Public Health Goal is 3 ppt (Dec 06)

• No Drinking Water Standard

• DHS Notification Level is 10 ppt

Carmichael Water District Drinking Water Wells

Arden-CordovaWater Service Wells

Existing Monitor Wells

Proposed Monitor Wells

Groundwater Flow Direction

ND

ND

NDND

93 270

300

50

3451

NDND ND

ND

6

ND

7

2004 NDMA Plume

What Has Been Done in Area 4

• Additional Groundwater Monitor and Extraction Wells Built

• Construction and Operation of the GET L-B Facility on Bajamont - 2007

• Negotiated Agreement with Sacramento County to Allow Construction GET L in Ancil Hoffman Park – begin construction in Summer 2008

• Treated water to be used on the golf course• Modifed Aerojet’s Permit to Discharge Treated Water to

the American River• CEQA Completed

Carmichael Water District Wells

Changes Since June 04

Groundwater Flow Direction

GET L-B Operating

New Extraction Wells

Ancil Hoffman Park

New Monitoring Wells

ND

78

ND

ND

180

Carmichael Water District Wells

Arden-CordovaWater Service Wells

Monitor Wells

ND

ND

ND

39

1.8J

42430

ND

NDMA Layer C

Groundwater Flow Direction 67

2J

36

ND

98

250

350

ND

Carmichael Water District Wells

Monitor Wells

ND

ND

ND

39

NDND

NDMA Layer D

Groundwater Flow Direction

ND

ND

ND

ND

ND

Arden-CordovaWater Service Wells

ND

78

1.4J

ND

ND

ND

ND

ND

4.7

Carmichael Water District Wells

Monitor Wells

ND

ND

ND

ND

3.3J

4.57.8

Perchlorate Layer C

Groundwater Flow Direction 1.9J

ND

ND

Arden-CordovaWater Service Wells

2.0J1.8

1.4J

4.6

5.9

ND

2.2J

Carmichael Water District Wells

Monitor Wells

ND

ND

ND

ND

NDND

Perchlorate Layer D

Groundwater Flow Direction

ND

ND

ND

ND

ND

Arden-CordovaWater Service Wells

ND

6.7

Next Steps

• Complete Construction of GET L-A - 2009

• Complete Construction of GET K – 2008/9

• Operate Systems and Evaluate Capture – modify systems as needed

• Treatment Facilities Designed to Allow for Expansion

Carmichael Water District Wells

Next Steps

GET L-AGET KA

Ancil Hoffman ParkPotential Extraction Well

GET L-B DONE

N

Area for newextraction wells

•Current flow 13,000 gpm•86 billion gallons treated to date•Estimated Future Flow – 20,000 gpm•150 lbs chemicals removed daily•Over 720,000 lbs removed to date

Future Extraction Locations

N

GET L-A/L-B

GET K

GET HA

GET E/F

GET J

ARGET

GET D

Future

GET

E/F Expansion

Alpha GET(Boeing)

Admin GET(Boeing)

GET A

GET B

Future GET AExpansion

WRND GET HB(Boeing & AGC)

Aerojet Plume Capture

19

N

Soil Portions ofOperable Units

Carve-out Land

OU-5 – Perimeter Groundwater

Boundary OU

Central OU

Cavitt Ranch

Island OU

Eastern OU

Questions