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  • EPA Superfund Record of Decision:

    PB97-964513 EPA/541/R-97/135 January 1998

    El Toro Marine Corps Air Station, OU 2A & 3A (No Action Sites) El Toro, CA 9/29/1997

  • . . . ~~,;;ji~(~liL--,;:.'l. .... ; .·•. ,,,_:,.:~¥-'.;-'.''. ' '. ·{~,,-·. • SFUND RECORDS CTR .. ' . 3114-00210

    DRAFT FINAL RECORD OF DECISION

    OPERABLE UNITS 2A AND 3A NO ACTION SITES

    MARINE CORPS AIR STATION EL TORO, CALIFORNIA

    SEPTEMBER 1997

  • DECLARATION

  • DECLARATION

    SITE NAME AND LOCATION

    Marine Corps Air Station (MCAS) El Toro Operable Unit-3A, Sites 4, 6, 9, 10, 13, 15, 19, 20, 21, and 22 Operable Unit-2A, Site 25 Orange County, California

    STATEMENT OF BASIS AND PURPOSE

    Date: 09/26/97

    This decision document presents the selected remedial action for Sites 4, 6, 9, 10, 13, 15, 19, 20, 21, 22, and 25 at MCAS El Toro in Orange County, California. The document was developed in accordance with the Comprehensive Environmental Response, Compensation; and Liability Act of 1980 (CERCLA), as amended by the Superfund Amendments and Reauthorization Act of 1986 and, to the extent practicable, the National Oil and Hazardous Substances Pollution Contingency Plan. This decision is based on the administrative record file for these sites.

    The State of California (through the California Environmental Protection Agency, Department of Toxic Substances Control, and Santa Ana Regional Water Quality Control Board) and the U.S. Environmental Protection Agency concur with the selected remedy.

    DESCRIPTION OF THE SELECTED REMEDY: NO ACTION

    The selected remedy for Sites 4, 6, 9, 10, 13, 15, 19, 20, 21, 22, and 25 is no action. In selecting the no action remedy for these sites, the Navy has determined that the existing condition of the sites is protective ofhuman health and the environment.

    Although no deed restrictions are required because of chemicals present in soils at the no action sites, shallow groundwater underlying Sites 9, 10, 13, 15, 21, 22, and portions of Site 25 is contaminated by trichloroethene and tetrachloroethene. Remedial investigations have shown that the contamination does not originate from these sites but from Site 24, the volatile organic compound source area. Use restrictions for several sites (including Site 24 and the no action sites listed above) prohibiting drilling of wells and/or extraction of groundwater and allowing access for groundwater monitoring and maintenance of equipment associated with groundwater remediation will be addressed in the Proposed Plan(s) and Record(s) of Decision for Operable Unit-1 and -2A regarding groundwater. ·

    DECLARATION STATEMENT

    Ba$ed on extensive field investigations, laboratory analyses, and a thorough assessment of potential human-health risks at each location and of potential ecological risks at Site 25, the Navy has determined that no remedial action is necessary to assure the protection of human health and the environment at Sites 4, 6, 9, 10, 13, 15, 19, 20, 21, 22, and 25. The Remedial Investigations of these sites show that contamination is limited to the shallow soil interval (Sites 4, 6, 9, 10, 13, 15, 19, 20, 21, and 22) and to sediment and

    Draft Final Record of Decision- OU-2A and OU-3A No Action Sites, MCAS El Toro page 1 09123197 8:39 N.A mkm l:lword.J>"'1\reports\clo1351rod\mcasldftfonar.9700164a.doc

  • Date: 09/26/97

    Declaration

    surface water (Site 25). The human health and ecological risk assessments show that the chemicals present in these media do not present an unacceptable risk to human health or the environment. Therefore, no remedial action is required at these sites. Since hazardous substances are not present at concentrations above unacceptable levels, CERCLA Section 121 cleanup standards do not apply.

    Signature: --------------------- Date: ____ _

    Signature:

    Mr. Joseph Joyce Base Closure and Realignment Environmental Coordinator Marine Corps Air Station El Toro

    Mr. John E. Scandura, Chief Southern California Operations Office of Military Facilities Department of Toxic Substances Control

    Date: ____ _

    Signature: ~A~- r. Daniel D. Opals ·, Ch1ef

    Federal Facilities Cleanup Branch

    Date: fd:Jh7

    Signature:

    page2

    United States Environmental Protection Agency, Region IX

    Mr. Gerald J. Thiebeault Executive Officer Regional Water Quality Control Board, Santa Ana Region

    Date: ____ _

    Draft Final Record of Decision - OU-2A and OU-3A No Action Sites, MCAS El Taro 09123197 8:39AM mkm l:lword_p-1\repoltslcto135\rodlmcasldftfonall9700164a.doc

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    09/30/97 TUE 15:57 [TX/RX NO 5313)

  • Date: 09/26/97

    TABLE OF CONTENTS

    Section Page

    DECLARATION

    DECISION SUMMARY

    1 SITE NAME, LOCATION, AND DESCRIPTION

    1.1 Site Nrune......................................................................................................... 1-1

    1.2 Site Location.................................................................................................... 1-1

    1.3 Site Description................................................................................................ 1-1

    1.4 Geology and Hydrogeology............................................................................. 1-5

    1.5 Surface Hydrology........................................................................................... 1-6

    1.6 Current Land Use ................................................................................ :............ 1-6

    1.7 Future Land Use............................................................................................... 1-15

    2 SITE HISTORY AND ENFORCEMENT ACTIVITIES

    3 HIGHLIGHTS OF COMMUNITY PARTICIPATION

    3.1 Restoration Advisory Board ....... ......... ........... ..... .. .. ...... .. .... ... . . .. . . ..... .. ...... ... .. . 3-1

    3.2 Fact Sheets....................................................................................................... 3-1

    3.3 Community Participation for No Action Sites................................................. 3-2

    4 SCOPE AND ROLE OF OPERABLE UNIT

    5 SUMMARY OF SITE CHARACTERISTICS

    5.1 Site4 ................................................................................................................ 5-1

    5.2 Site 6 ................................................................................................................ 5-2

    5.3 Site 9 ................................................................................................................ 5-2

    5.4 Site 10 .............................................................................................................. 5-5

    5.5 Site 13 ..................... :........................................................................................ 5-7

    5.6 Site 15 .............................................................................................................. 5-9

    5.7 Site 19 .............................................................................................................. 5-11

    5.8 Site20 .............................................................................................................. 5-14

    Draft Final Record of Decision- OU-2A and OU-3A No Action Sites, MCAS El Taro 09i23197 11:38 AM mkm l:lword_p-11reports\cto135\rodlmcasldftfinal\9700164a.cloc

    page i

  • Date: 09/26/97

    TABLE OF CONTENTS (continued>

    Section Page

    5.9 Site 21 .............................................................................................................. 5-18

    5.10 Site22 .............................................................................................................. 5-18

    5.11 Site 25 .............................................................................................................. 5-23

    6 SUMMARY OF SITE RISKS

    6.1 Human-Health Risk Assessment...................................................................... 6-1

    6.2 Ecological Risk Assessment............................................................................ 6-4

    7 DESCRIPTION OF NO ACTION ALTERNATIVE

    8 DOCUMENTATION OF SIGNIFICANT CHANGES

    9 REFERENCES

    RESPONSIVENESS SUMMARY

    ATTACHMENT

    A ADMINISTRATIVE RECORD FOR NO ACTION SITES

    FIGURES

    Figure

    1-1 Vicinity Map .................................. ........................................................ ...................... 1-2

    1-2 Site Location Map..........................................................................................

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