Transcript GROUNDWATER CONTAMINATION AND REMEDIATION NEAR …

Carmichael Town Hall Meeting
Western Groundwater Operable Unit
- Update
12 March 2008
Alexander MacDonald (RWQCB)
916-464-4625
[email protected]
Outline
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Background and Regulatory Perspective
2004 Plume in Carmichael
Contaminant Plumes in 2008
Work Completed Since 2004
The Big Picture
Sacramento
American River
US 50
Interstate 99
Aerojet
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
Western Groundwater
Operable Unit
Area 4
Area 2
Aerojet
Area 3
Area 1
IRCTS
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
ND
ND
Carmichael Water
District Drinking Water Wells
ND
Groundwater Flow
Direction
93
270
50
ND
Existing Monitor
Wells
Proposed
Monitor Wells
2004 NDMA Plume
300
34
51
6
ND
ND
7
ND
ND
Arden-Cordova
Water Service Wells
ND
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
Groundwater Flow
Direction
GET L-B Operating
New Monitoring Wells
Ancil Hoffman Park
New Extraction
Wells
Changes Since June 04
ND
ND
Carmichael Water
District Wells
Groundwater Flow
Direction
ND
ND
ND
180
ND
78
ND
39
2J
430
42
Monitor Wells
1.8J
36
ND
NDMA Layer C
Arden-Cordova
Water Service Wells
67
ND
ND
Carmichael Water
District Wells
Groundwater Flow
Direction
98
350
ND
1.4J
ND
250
ND
39
ND
78
ND
Monitor Wells
ND
ND
ND
ND
NDMA Layer D
ND
Arden-Cordova
Water Service Wells
ND
ND
ND
Carmichael Water
District Wells
Groundwater Flow
Direction
ND
ND
ND
4.7
ND
ND
ND
ND
ND
7.8
4.5
Monitor Wells
3.3J
1.8
2.0J
Perchlorate Layer C
Arden-Cordova
Water Service Wells
1.9J
ND
ND
Carmichael Water
District Wells
Groundwater Flow
Direction
1.4J
5.9
ND
2.2J
ND
4.6
ND
ND
ND
6.7
ND
Monitor Wells
ND
ND
ND
Perchlorate Layer D
ND
Arden-Cordova
Water Service Wells
ND
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
GET L-B DONE
Potential Extraction Well
Ancil Hoffman Park
GET KA
GET L-A
Next Steps
Future Extraction Locations
Area for new
extraction wells
N
•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
ARGET
GET L-A/L-B GET J
GET K
Future GET A
Expansion
GET A
GET D
GET E/F
GET HA
WRND
GET HB
GET B
(Boeing & AGC)
N
Alpha GET
(Boeing)
Admin GET
(Boeing)
Aerojet Plume Capture
Soil Portions of
Operable Units
Carve-out Land
OU-5 – Perimeter Groundwater
Boundary OU
Central OU
Island OU
Eastern OU
Cavitt Ranch
N
Questions