| 4,741 ACRES; 9MI NE OF NEWPORT BEACH, CA |
| IRVINE, CA 92709 |
| ORANGE COUNTY |
| SITE TYPE: CLOSED BASE |
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Site Information
CLEANUP STATUS
ACTIVE AS OF 5/1/1986
| SITE TYPE: CLOSED BASE |
| NATIONAL PRIORITIES LIST: YES |
| ACRES: 4712 ACRES |
| APN: NONE SPECIFIED |
| CLEANUP OVERSIGHT AGENCIES: |
RWQCB 8 - SANTA ANA
DTSC - SITE CLEANUP PROGRAM
US EPA - LEAD |
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| ASSOCIATED GEOTRACKER PROJECTS |
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| ENVIROSTOR ID: |
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30970003 |
| SITE CODE: |
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400055 |
| SPECIAL PROGRAM: |
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| FUNDING: |
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BRAC 93 |
| ASSEMBLY DISTRICT: |
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71 |
| SENATE DISTRICT: |
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33 |
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| PAST USE(S) THAT CAUSED CONTAMINATION |
| AIRCRAFT MAINTENANCE, AIRFIELD OPERATIONS, EQUIPMENT/INSTRUMENT REPAIR, FIRE TRAINING AREAS, FUEL - AIRCRAFT STORAGE/ REFUELING |
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| POTENTIAL MEDIA AFFECTED |
| OTHER GROUNDWATER AFFECTED (USES OTHER THAN DRINKING WATER), SOIL, SURFACE WATER AFFECTED |
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Site History
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Marine Corps Air Station (MCAS) El Toro began operation in 1943 and was closed on July 2, 1999. The station mission involved the operation and maintenance of military aircraft and ground support equipment. ` MCAS El Toro was added to the National Priority List in 1990 due to a trichloroethene (TCE) plume in regional groundwater extending three miles off-station. ` A total of 24 Installation Restoration Program sites are grouped into three Operable Units (OUs). OU-1 is the regional groundwater contaminated with volatile organic compounds (VOCs). OU-2 include the VOC source area (soil and shallow groundwater) and the former landfill sites. OU-3 includes sites with potential sources for a variety of contaminants such as VOCs, semivolatile organic compounds (SVOCs), pesticides, herbicides and polychlorinated biphenyls (PCBs). ` A Federal Facility Agreement (FFA)for the remediation of the station was signed in October 1990 by the U.S. Navy, EPA and the State, represented by DHS (now DTSC) and the RWQCB.
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