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Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Edwards Air Force Base

EPA #: CA1570024504

State: California(CA)

County: Kern

City: Near Lancaster

Congressional District: 21

Other Names: Edwards AFB Rocket Engine Test Area

Bulletin Board

On 10/13/17, this website will no longer be updated. Site information will be migrated to the new web page at: http://www.epa.gov/superfund/edwardsafb .
EPA appreciates your patience through this transition. If you have questions, please contact EPA staff listed below.


Description and History

NPL Listing History

NPL Status: Final

Proposed Date: 07/14/89

Final Date: 08/30/90

Deleted Date:

Edwards Air Force Base covers approximately 301,000 acres, and is principally an aircraft research and development facility. The Main/South Base at the western edge of Rogers Dry Lake is primarily used for maintaining and refueling aircraft. In the past, large amounts of fuel and solvents were spilled. Poor disposal practices also resulted in the release of volatile organic compounds (VOCs), metals, and other chemicals to the ground. At the Air Force Research Laboratory on a remote elevated ridge, rocket engine testing activities resulted in four extensive groundwater contamination plumes of VOCs and perchlorate in fractured granite bedrock. Contaminated areas in other parts of the Base include an abandoned sanitary landfill containing heavy metals and an area where electroplating wastes were dumped. The North Base, located five miles northeast of the Main Base area, has a drum storage site at the northern end of Rogers Dry Lake and three unlined surface impoundments used for liquid wastes during the 1960s and 1970s.

The 13,800 employees at Edwards Air Force Base obtain some of their drinking water from wells located within three miles of the Main/South Base. A more immediate concern is the potential for vapors from volatile chemicals in the groundwater reaching buildings located above the subsurface contamination. Lancaster and small communities are located miles away from Base operations and contamination.

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Contaminants and Risks

Contaminated Media
  • Groundwater
  • Surface Water
  • Air
  • Soil and Sludges
  • Environmentally Sensitive Area

Groundwater and soils have been contaminated with various fuels and solvents including trichloroethene (TCE) and tetrachloroethene (PCE). These are volatile organic compounds (VOCs). Perchlorate, 1,4-dioxane , NDMA and various metals are non-volatile contaminants found in some areas. In addition to these contaminants, landfills may contain unexploded ordnance or other munitions related materials. The presence of an unregulated group of chemicals, Perfluorinated Compounds (PFCs), is being assessed at several locations on the Base.

People may face a health risk by breathing indoor air in some buildings located above or near VOC-contaminated media, drinking contaminated groundwater, or making contact with some soils or materials in landfills. Some surface water is threatened by seeps of TCE-contaminated groundwater. Over 65,000 acres of the Air Force Base are designated critical habitat for the threatened desert tortoise.

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Who is Involved

This site is being addressed through Federal actions. A Federal Facility Agreement (FFA) was signed by the Air Force, EPA, and two State Agencies in 1990.

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Investigation and Cleanup Activities

The Air Force conducted many immediate actions (Interim Removal Actions) to begin cleanup of contaminated soil, debris, and groundwater. Some field-scale treatability studies also have removed significant contaminant mass. The Air Force continues to test a variety of innovative treatment technologies at Edwards, while they complete the Remedial Investigations of different areas of the Base.

An extensive groundwater monitoring program is operating, and is constantly being updated to better define the extent of contamination and effectiveness of the cleanup actions. Groundwater monitoring and other types of soil, air and water sampling provide information for Remedial Investigations (RI) at contaminated areas. With an adequate RI, the Air Force can develop feasible cleanup proposals (through a Feasibility Study or FS), leading to public review and comment on a formal Proposed Plan. When a decision on cleanup is reached for a particular area within the Base, it is documented in a Record of Decision (ROD).

Approximately 470 sites identified as having potential contamination are grouped within 10 larger areas of the Base called an Operable Unit or OU. Many sites have been sufficiently investigated to determine that they need No Further Investigation or No Further Action because of insignificant residual contamination. For contaminated sites that do pose a potential risk, the Air Force performs the cleanup actions for each location as they are selected in a Record of Decision (ROD). Currently, eight RODs have been signed and EPA anticipates nine more through 2025. Several of the ROD are likely to require evaluation by the EPA's National Remedy Review Board, lengthening the process.

Initial Actions

Immediate Actions: In 1984, drums and contaminated soil in a drum disposal area were removed, and that site was capped. In addition, contaminants at the Main Base toxic waste disposal area were removed, and that site was re-graded. A removal action was completed in November 2002 at Site 426, a suspected Chemical Warfare Materiel disposal site. No hazardous materials or chemical wastes were found during the removal action. The excavated soil and concrete were determined to be clean and were properly disposed.

Interim Actions: The Air Force is currently operating a variety of treatment systems as interim actions prior to selecting final remedies in RODs.

OU2 Site 5: At South Base Site 5, the petroleum, oil, and lubricants storage area tanks were excavated, or filled with clean sand, and the area was re-graded. In 1997, a Dual Extraction System was installed and put into operation. The system was designed to extract groundwater contaminated with solvents (primarily TCE) and jet fuel from the groundwater. The system was shut down in 1997, after removing over 650,000 pounds of organic contaminants and 1,000 pounds of TCE. The treatment system and associated piping were removed in 2009.

Site Studies

Entire Base:
The Edwards AFB investigation into the nature and extent of contamination is currently focusing on areas with additional information needs, called ‘data gaps’. Ten Operable Units (OUs) have been identified by the Air Force and seven are currently in the Remedial Investigation/Feasibility Study (RI/FS) phase. One or more Records of Decision (RODs) will be prepared for each OU and a total of 17 are projected for completion through 2025. Air Force document titles identify the Air Force OU designations and specific sites within OUs. Click here to view the Edwards Air Force Base Regional Map with Plumes and Production Wells

Main Base/Flightline (OU1): In 1992, the Air Force began an investigation of the contamination found at the Main Base/Flightline. There are five main groundwater plumes on the flightline. Contaminants include VOCs and petroleum related products. Since completion of the RI Report in April 1996, many interim treatment systems, including SVE/Air Sparging and dual extraction systems, have been put in place to reduce levels of contamination in the source area. In addition, many treatability studies have been implemented across the sites to test and evaluate the effectiveness of a number of in situ technologies, where cleanup takes place underground. In addition, the Air Force is currently investigating indoor air for likely refinements to the baseline risk assessment for the vapor intrusion pathway. In 2012 the Air Force determined that some groundwater plumes from neighboring OU8 are entering OU1 and mingling with at least one of the OU1 plumes. The Air Force now plans to amend the 2008 OU1 FS and develop a combined OU1/OU8 Proposed Plan, expected to be made available to the public by 2019.

South Base (OU2): This OU contains a variety of different types of sites. A Proposed Plan was provided for Public Comment in August 2006. Subsequently, this OU was divided into several different separate decisions based on new information considered by the FFA parties.
1) South Base ROD (signed June 2009): See "Remedy Selected" section.
2) South Base ROD Amendment for Sites 29 Landfill (signed September 2012): See "Remedy Selected" section.
3) South Base Skeet Range Sites 81 and 102: These two sites were separated from the OU 2 ROD. In 2014, the Air Force completed an Engineering Evaluation/Cost Analysis and an Action Memorandum in 2015 for a non-time-critical removal action. The removal action is scheduled to be complete in 2018.
4) South Base Site 5: Remedial Investigations are on-going at Site 5 to determine the source and extent of a carbon tetrachloride plume that has migrated into the Sites 5/14 groundwater plume. An OU2 Site 5 Carbon Tetrachloride Proposed Plan for a ROD amendment is expected to be made available to the public in 2017. Vapor intrusion pathway sampling is being performed at Building 120 in support of this report.

Air Force Research Lab (AFRL) Sites (OU4/9, formerly OU 4 & OU 9): The Air Force tested rocket engines at this remote ridge in the eastern part of the base. These OUs are grouped together due to the similar geology at these areas. Four major plume areas containing TCE, PCE and perchlorate have been identified in addition to a number of soil and debris sites associated with the operations. Five RODs are organized as follows.
1) South AFRL Groundwater ROD (signed September 2007): See "Remedy Selected" section.
2) AFRL Soil and Debris Sites ROD (signed August 2008): See "Remedy Selected" section.
3) Arroyos Groundwater ROD (OU4/9): This commingled plume area is located in the steep northwest part of OU 4/9. The RI and FS Reports were completed in March 2005 and December 2008, respectively. In the August 2009 Proposed Plan, the Air Force proposed a remedy similar to that of the South AFRL ROD. A new version of the draft final ROD was submitted in 2014. As of 2015, the Draft Final ROD is being disputed by the State and EPA.
4) Northeast AFRL Groundwater ROD (OU 4/9): Two separate plume areas in OU 4/9 have slightly different hydrogeological conditions. In 2010 the Air Force split them for separate planned RODs. The NE AFRL plume was evaluated for a TI waiver in the 2015 draft FS. A Proposed Plan for public comment is expected in 2019.
5) Mars Boulevard Groundwater ROD (OUs 4/9): Originally part of the NE AFRL RI/FS project, this area was evaluated for a TI waiver in the 2015 FS. The Air Force will offer a Proposed Plan for public comment in 2019.

North Base (OU 5 & OU 10, aka OU 5/10): There are three main groundwater plumes in the Occupied North Base (OU5). Known or suspected contaminants consist of benzene, carbon tetrachloride, nitrates, TCE, cis-1,2-DCE, other VOCs, and perchlorate. A groundwater extraction and treatment system (GETS) using Ion Exchange is operating at Site 285, which has the perchlorate plume. Influent perchlorate concentrations averaged 372 ppb for 2003, the first year of the GETS operation. As of September 2014, over 79.8 million gallons of groundwater have been treated and over 175.3 pounds of perchlorate has been removed from the site. The annual average concentration of perchlorate in 2014 was 68 ppb.

OU5/10 Site 1 consists of five subsites (1A through 1E) located in the unoccupied North Base by Rogers Dry Lake. It was used as a drum disposal site by the Air Force Research Laboratory [AFRL]) for various organic compounds, nitric acid, empty drums, and metal debris from the 1950s until the late 1970s. Potential and known contaminants present at Site 1 include metals, oils, solvents, acid, fuels, and alcohols. A synthetic liner and clay cap was installed on Sites 1C and 1D in 1987 to prevent infiltration of water into the underlying soil. As part of the CERCLA process, Site 1 soil and groundwater will continue to be evaluated to further characterize the extent of the contaminant plume. Site 1 will continue in the CERCLA process and will be included in the OU5/10 Feasibility Study (FS) Work Plan and the FS Addendum, as well as the Proposed Plan and ROD.

The OU5/10 Proposed Plan for public comments is expected in 2018.

Basewide Miscellaneous (OU 7): This OU involves all sites and base areas not located in one of the other nine Air Force OU Areas. There are three OU 7 areas under investigation and each will have a separate FS and ROD. The military munitions area may remain a separate Air Force program. The four areas have RODs organized as follows.
1) Basewide Miscellaneous Sites ROD: A variety of sites around the base that do not fit within the other nine OU areas are assembled into a draft Proposed Plan, based on a June 2008 RI Report and a January 2010 FS Report. Some site-specific RI/FS Addenda will be prepared by 2018. A final Proposed Plan is expected to go to the public by 2018.
2) Chemical Warfare Materiel (CWM) ROD (signed Sept. 2009): See "Remedy Selected" section.
3) Site 3 Landfill ROD: (signed Sept. 2012): See "Remedy Selected" section.
4) Basewide Military Munitions Response Program ROD: The Air Force is currently in the equivalent of a CERCLA PA/SI phase of investigating possible locations of military munitions at various locations around the base. The Air Force will complete investigations and evaluations of alternatives by 2017, and a final decision might come by 2020. Some privately owned acreage adjacent to the Edwards AFB fence line might have to be added to the total acreage associated with this NPL Site. Currently a removal action is targeting three locations with surface materiel that needs to be removed before further studies can be planned. The Air Force signed an action memorandum for this removal in February 2012.

Northwest Main Base (OU 8): This area consists of five main groundwater plumes. All the plumes are migrating in the direction of OU1 and OU 6. An RI Report was issued in March 2006 followed by an addendum in April 2008 for Sites 299 and 301. Site 25 will be addressed by a separate ROD due to its size and complexity. The two RODs planned for OU8 are as follows:
1) Miscellaneous Soil and Groundwater Sites ROD: This ROD will address soil and groundwater at Sites 61, 299, and 301. The Air Force issued a draft Proposed Plan in late 2009 for regulatory review. However, many issues related to monitored natural attenuation need an extended time to resolve, in part because of similarities to issues raised at OU 1. In 2012 the Air Force determined that some groundwater plumes from neighboring OU8 are mingling with at least one of the OU1 plumes. The Air Force now plans to amend the OU1 FS and combine these OU8 plumes in an FS Addendum and a combined OU1/OU8 Proposed Plan. The Proposed Plan will be made available to the public by 2019. EPA anticipates the ROD will be signed in 2020, possibly as a joint groundwater ROD with OU1 and a separate ROD for the OU 8 soil remedies.
2) Site 25 ROD: Spills at the fuel storage area led to a large plume contaminated with 1,4-dioxane, NDMA, and TCE. The TCE was released on the ground surface and migrated into fractured bedrock. Undissolved solvents remaining in the bedrock and very slowly dissolving into the groundwater makes full cleanup impractical. A shallow groundwater extraction and treatment system (GETS) operated as an interim, albeit inadequate, containment measure for a portion of the upper groundwater layer at the leading edge of the plume. This contaminant plume is slowly migrating toward the NASA Armstrong OU 6 area. The GETS system was shut down in 2010 because it was not producing significant contamination removal particularly from deeper areas. The Air Force Process Optimization Team recommended the system be turned off to adequately assess the plume dynamics. Even though this system is no longer operating, it is being maintained for possible future operation should augmentation of this system prove to be useful as part of future remediation. A draft Proposed Plan may be ready for review in 2017. Involvement of EPA's National Remedy Review Board will likely result in a final Proposed Plan issued for public comment in 2018. EPA anticipates the ROD will be signed by 2019.

Completed Site Studies: RI reports for all OUs, except for the MMRP OU areas, have been completed, although some current site-specific investigations will be included in future addenda to previous reports. Dates of completed Final RI and Final FS reports are included, along with completed Proposed Plan dates, in the following "Remedy Selected" section.

Remedy Selected

South Base (OU 2): In 2009 EPA signed a ROD for cleanup of three groundwater plumes and containment of a landfill site. Four other sites were identified for no action. These decisions were based on the 2004 RI Report and 2005 FS Report. A Proposed Plan was provided for Public Comment in 2006. The main contaminants of concern for this OU are TCE, PCE carbon tetrachloride, and a group of petroleum chemicals called BTEX. See details in the Remedy Design section.

South Base (OU2) Sites 81 and 102: The interim remedy selected for the sites includes removing the lead shot and skeet target debris from Rogers Dry Lake from areas where vegetation will be maintained. Waste removed will be consolidated in areas of the sites impacted with lead shot and skeet target debris. The two sites will then be covered with crushed concrete to prevent wildlife from reaching the lead shot. The interim remedy will be implemented in 2018.

South Base Site 29 Landfill (OU 2): In 2012 EPA signed a ROD Amendment replacing containment of the landfill site with a clean closure remedy instead. See details in the Remedy Design section.

Basewide Wells (OU 3): The Air Force completed a survey of all historic wells and Air Force wells installed prior to the CERCLA investigations. Only eight needed further investigation and were described in the 1999 RI Report. A No Further Action Proposed Plan was provided for Public Comment in 2003. In 2003 EPA signed a ROD for No Further Action.

South AFRL Groundwater Plumes (OUs 4/9): On September 28, 2007 EPA signed a ROD for a Technical Impracticability ARAR Waiver and Land Use Controls (LUCs) to prevent exposure to vapors in overlying structures. These decisions involved four source sites and were based on the March 2005 RI Report and June 2005 FS Report. A Proposed Plan was provided for Public Comment in April 2006. The main contaminants of concern for this OU are TCE, PCE, 1,4 dioxane, perchlorate, benzene and NDMA. See details in the Remedy Design section. A Draft Final Explanation of Significant Differences (ESD) was submitted in May 2014. EPA and the State disagreed with portions of the ESD and are currently in the formal dispute process.

AFRL Soil and Debris Sites ROD (OUs 4/9): In 2008 EPA signed a ROD that selected soil and debris remedies for 8 sites located throughout OU4/9. Another 10 sites in these OUs were designated as no action sites. These decisions were based on the 2005 OU4 RI Report, 2006 OU 9 RI Report, and 2006 FS Report. A Proposed Plan was provided for Public Comment in 2007. The main contaminants of concern among these soil and debris sites are PCBs, beryllium, perchlorate, and PAHs. (see remedy details in "Ongoing Cleanup" section below). A 2013 ESD for PCB Site 312 documented cessation of excavation and the use of LUCs for a small amount of in contaminated soil inaccessible beneath a currently established transformer foundation.

NASA Armstrong (OU6): In 2006 EPA signed a groundwater cleanup ROD involving 3 source sites. Three other sites were identified for no action. These decisions were based on the 2000 RI Report and 2004 FS Report. A Proposed Plan was provided for Public Comment in 2005. The main contaminants of concern for this OU are TCE, and benzene. See details in the Remedy Design section.

Chemical Warfare Materiel Sites ROD (OU7 CWM): On September 16, 2009 EPA signed a ROD that addresses three separate ordnance debris burial areas collectively known as Site 442. Another area (Site 426) was designated as a No Action Site. These decisions were based on the July 2006 RI Report and August 2007 FS Report. A Proposed Plan was provided for Public Comment in April 2008. See details in the Remedy Design section.

Site 3 Landfill ROD (OU7 Site 3): In 2012 EPA signed a ROD addressing the Main Base Inactive Landfill and associated low-level groundwater contamination (primarily solvents) which extends just beyond the footprint of the buried waste in weathered and fractured bedrock. This decision was based on the 2008 OU 7 RI Report, the site-specific 2008 FS, the 2009 FS Addendum, and the Proposed Plan issued in 2010. See details in the Remedy Design section.

Remedy Design

South Base (OU2): The Air Force began investigations of South Base in 1992. South Base was abandoned and almost completely demolished in the 1960s. It was rebuilt in the late 1980s to support the Stealth Bomber program. The 2009 ROD addresses three groundwater plumes with containment and cleanup. The ROD addresses a closed landfill through an improved cover and monitoring program in addition to LUCs. Some response actions at one of the plumes and at the landfill were begun voluntarily by the Air Force before the ROD was signed. Design documents for the Site 29 landfill, Site 76 groundwater plume, and Site 86 groundwater plume were finalized in 2010. Design documents for the Sites 5/14 groundwater plume were finalized in 2010 and 2013. A design phase investigation at the Site 29 landfill resulted in some significantly reduced estimates of the size of the landfill. The South Base ROD was officially amended in late 2012 to include removal of the waste instead of the originally documented capping remedy. The Site 29 Remedial Action Work Plan was finalized in 2013. In the initial phases of excavation at the site, potential munitions were encountered, delaying construction, now scheduled for 2017 through 2018.

Site 3 Landfill ROD (OU7 Site 3): EPA anticipates a completed design and the beginning of field work by 2017 for the consolidation of one waste cell and the installation of an evapotranspiration cover of the Site 3 Landfill.

Completed Designs: Four of the five signed Action RODs have completed Remedial Designs on the following dates:
OUs 4&9 South AFRL on 6/12/09,
OUs 4&9 AFRL Soil and Debris Sites on 9/28/09,
OU 6 NASA Dryden on 2/15/08, and
OU 7 Chemical Warfare Materiel Sites on 11/9/10.

Cleanup Ongoing

South AFRL (OU 4&9): The remedy does not involve ongoing cleanup, although the Air Force will continue monitoring eventual containment of the solvent and perchlorate contaminated plumes by natural attenuation and will continue maintaining land use controls within the Containment Zone. Monitoring of plume migration is also used to determine where land use controls need to be applied to protect buildings from vapor intrusion into indoor air.
A final RD/RA Work Plan was approved by EPA in 2009. Groundwater monitoring is already underway from the pre-ROD program and will be refined per RD/RA Work Plan specifications. A vapor intrusion sampling program was designed as part of the above RD/RA Work Plan. The long-term O&M phase began in 2009. The first five year review of this remedy was completed in 2012.

AFRL Soil and Debris Sites (OUs 4&9): Cleanup work in the field was begun voluntarily by the Air Force before the ROD was signed. Now all 8 of the action sites are being addressed by implementation of the 2009 RD/RA Work Plan. Contaminated groundwater associated with these sites will be studied and addressed by one of the four other AFRL RODs described earlier in this fact sheet. A 2013 Explanation of Significant Difference for PCB Site 312 documented the end of excavation and the use of LUCs for a small amount of in contaminated soil inaccessible beneath a currently established transformer foundation. The Air Force will address final cleanup of this soil whenever the transformer is decommissioned and dismantled.
NASA Armstrong (OU6): There is a commingled plume primarily contaminated with TCE and PCE. The 2006 ROD requires injection of chemical oxidation reagents into groundwater to degrade chlorinated hydrocarbons and enhanced natural attenuation of aromatic hydrocarbons to MCLs. All soil sites are determined to require no action. The first phase of remedy implementation began as a treatability study that became full scale in 2005. The second phase involving annual injections of oxidation reagents is now underway in accordance with the February 2008 Remedial Design. A five year review of this remedy was submitted in 2011. EPA deferred the Five Year Review Protectiveness Statement until the Air Force provides some additional data and analysis in a Five Year Review Report Addendum. The Second Five Year Review Report is scheduled for 2016 and will include the Vapor Intrusion Investigation Report.

Cleanup Complete

None of the Operable Units at Edwards is fully cleaned up. However one operable unit (OU 3 Basewide Wells) and a number of individual sites were determined to need No Further Action because previous Interim Response Actions reduced contamination below action levels selected for the ROD addressing the particular OU area or site.

Edwards Air Force Base is participating in the Installation Restoration Program, a specially funded program established by the Department of Defense (DOD) in 1978 to identify, investigate, and control the migration of hazardous contaminants at military and other DOD facilities. The Base Environmental Restoration Program initiated an aggressive removal action program and began its implementation in 1995. The interim actions are on-going and the Air Force is completing the investigations at all the sites. The first eight RODs have been signed: OU 3 in 2003, OU 6 in 2006, OU 4 &9 South AFRL in 2007, OU 4 &9 AFRL Soil and Debris Sites in 2008, OU2 South Base in 2009, OU 7 Chemical Warfare Materiel Sites in 2009, OU 7 Site 3 Landfill in 2012, and a Site 29 Amendment for OU 2 South Base in 2012.

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Cleanup Results to Date

The removal of drums, tanks, and contaminated soils has reduced the potential of exposure to hazardous substances at the Edwards Air Force Base site while investigations are taking place and cleanup activities are being planned. Many OUs currently have significant treatability studies involving groundwater and soil vapor extraction and treatment, with ongoing monitoring and reporting. For example, a significant amount of source removal has already been conducted by the Air Force at OU 1 groundwater and soil areas. The OU 6 ROD groundwater cleanup action is underway.
OU2 Sites: OU 2 South Base ROD groundwater cleanup is partially underway at the Sites 5/14 plume. The OU2 South Base ROD groundwater cleanup action is underway at the Sites 76 and 86 plumes. The EPA did not concur on the protectiveness determination in the first Five Year Review, which was submitted in 2014, citing the lack of plume delineation. The Air Force is in the process of defining the Sites 5/14, 76, and 86 contaminant plumes. The plumes will be fully defined prior to the submittal of the next Five Year Review in 2018.

OU 7 Chemical Warfare Materiel (CWM) Sites: The final remedies for the three OU7 Chemical Warfare Materiel burial areas have been implemented. The covers over the burial areas were improved, and fences and stormwater diversion berms were installed. The EPA concurred on the protectiveness determination in the first Five Year Review in 2014.

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Potentially Responsible Parties

Potentially responsible parties (PRPs) refers to companies that are potentially responsible for generating, transporting, or disposing of the hazardous waste found at the site.

The Air Force is the PRP for the site and has the lead for investigation and cleanup. EPA and the State provide oversight in accordance with the FFA.

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Community Involvement

Public Meetings: Public Meetings: Restoration Advisory Board Meetings are held every six months, typically on the last Thursday of the month at a community surrounding Edwards AFB.

The Report to Stakeholders is available in the public information repository or by contacting the Air Force at 661-277-8707

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Public Information Repositories

The public information repositories for the site are at the following locations:

Edwards Air Force Base Library,
5 W. Yeager Blvd,
Edwards AFB, CA 93524

Kern County Public Library,
Rosamond Branch,
3611 Rosamond Blvd,
Rosamond, CA 93560

Los Angeles County Public Library,601 W. Lancaster Blvd,
Lancaster, CA 93534

The most complete collection of documents is the official EPA site file, maintained at the following location:

Superfund Records Center

Mail Stop SFD-7C

95 Hawthorne Street, Room 403

San Francisco, CA 94105

(415) 820-4700

Enter main lobby of 75 Hawthorne street, go to 4th floor of South Wing Annex.

Additional Links

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EPA Site Manager
Christopher Dirscherl
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
Viola Cooper
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
State Contact
Kevin Depies, Cal/EPA DTSC

Bruce Lewis, Cal/EPA DTSC

Christina Guerra, RWQCB

Alonzo Poach, RWQCB






Department of Toxic Substances Control
8800 Cal Center Drive
Sacramento, CA 95826-3200

Regional Water Quality Control Board
Lahontan Region (6B)
15095 Amargosa Road - Bldg 2, Suite 210
Victorville CA 92392
PRP Contact
Ai Duong
12 Laboratory Rd.,
Edwards AFB, CA 93524-8060
Community Contact
Gary Hatch
412 TW/PA
305 E. Popson Ave.
Edwards AFB, CA 93524-8060
Other Contacts
After Hours (Emergency Response)
(800) 424-8802

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