Carmichael Town Hall Meeting
Western Groundwater Operable Unit - Update
12 March 2008
Alexander MacDonald (RWQCB)
916-464-4625
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