Boeing

Santa Susana landscape

Santa Susana

Boeing has made significant progress with cleanup and restoration, and secured Santa Susana's bright future as open space habitat.

Remediation and Restoration

The former Santa Susana Field Laboratory is a 2,850-acre site with a rich history. Virtually every major U.S. space program, from the first manned Mercury flights to the Apollo moon landings and Space Shuttle fleet, owes part of its success to Santa Susana. It was also the site of energy research and development for the U.S. government, including leading-edge nuclear, solar and sodium technology.

Since acquiring its portion of the site in 1996, Boeing has made significant progress with cleanup and restoration. The company secured the future of nearly 2,400 acres as permanent open space habitat to benefit wildlife and the community, fulfilling a commitment made 10 years ago. The transformation of Santa Susana from field laboratory to open space is well underway, with native plants and animals reclaiming most of the previously developed areas of the property.

Boeing Draft DTSC Environmental Impact Report Stakeholder Summary

Boeing Statement at DOE Draft EIS Public Meeting

Santa Susana EIR One-pager

Santa Susana Backgrounder

Stormwater Fact Sheet

Groundwater Fact Sheet

Feature Stories

Pollinators Create buzz at Boeing and Beyond

Pollinators Create buzz at Boeing and Beyond

June 19, 2018 in Environment

Easy-to-replicate pollinators help ecosystems thrive on scales large and small.

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Boeing efforts 'paws-itive' for pumas

Boeing efforts 'paws-itive' for pumas

February 22, 2018 in Environment, Community

Boeing is part of several efforts to help protect mountain lions and other animals in and around the Santa Susana Field Laboratory in Southern California.

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Boeing secures historic Santa Susana site as open space habitat

Boeing secures historic Santa Susana site as open space habitat

April 25, 2017 in Environment

We announced 10 years ago we would preserve Santa Susana as open space. That promise is now reality.

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A Starring Role in Hollywood History

A Starring Role in Hollywood History

December 2, 2016 in Environment

Santa Susana has a storied past playing a lead role in the country’s space ambitions and providing a scenic backdrop for some Hollywood legends.

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Nature Knows Best in Strategy to Improve Stormwater Quality

Nature Knows Best in Strategy to Improve Stormwater Quality

January 5, 2015 in Environment

Biofilters play a key role in treating stormwater at Santa Susana and Lower Duwamish Waterway sites.

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Earth Day, Every Day

Earth Day, Every Day

June 2, 2015 in Environment, Community

From cleanup crews to cougars and conservation groups, the Santa Susana site in Southern California buzzes with life every day.

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From Space Race to Open Space

From Space Race to Open Space

April 21, 2014 in Environment

Art Lenox leads key parts of Boeing’s remediation program at Santa Susana in Simi Valley, Calif., a site that was previously used for government rocket-engine testing and energy research.

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A Natural Winner

A Natural Winner

March 20, 2013 in Environment

Boeing's stormwater management strategy for Santa Susana involves a biofilter, which uses natural processes to remove pollutants from stormwater runoff.

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An Extraordinary Past

Santa Susana landscape

The modern world has been substantially shaped by technological breakthroughs at the former Santa Susana Field Laboratory. A rocket engine testing and energy research site used for federal government programs, Santa Susana was where thousands of workers tested rocket engines used to defend the country, land on the moon, and launch satellites for GPS and cell phones. It was also a test site for advanced energy research programs. After more than 50 years of operation, nuclear research ended in 1988 and rocket engine testing ceased in 2006.

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    A Comprehensive Cleanup

    worker doing cleanup

    The former Santa Susana Field Laboratory was a key proving ground for rocket engines that propelled Mercury, Gemini, Apollo and Space Shuttle astronauts into orbit, as well as a test site for commercialized nuclear and alternative energy research. These past operations, which occupied approximately one-fifth of the sprawling 2,850-acre site, have left residual chemical contamination in soil and groundwater.

    Boeing and the other responsible parties, with oversight by regional and state environmental regulatory agencies, are conducting a thorough investigation in preparation for a comprehensive cleanup of the Santa Susana site. Over the years, numerous interim cleanup activities have addressed contamination in soil, groundwater and stormwater, furthering the progress toward restoration and preservation of this unique and valuable ecosystem.

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      A Bright Future, Today

      bobcat

      The restoration of the Santa Susana landscape is well underway, with native plants and animals reclaiming much of the 2,850 acres in less than a decade since the Field Laboratory closed. By the nature of the U.S. government work done there, the site was isolated from the growth and change of Southern California for more than half of a century. This allowed Santa Susana to remain one of the most intact and vast natural areas amidst the urbanization of this immensely populated area.

      Santa Susana continues to be a site of historic significance, with towering rocket engine test stands on NASA land and Native American artifacts throughout the property. Boeing secured a conservation easement that permanently preserves nearly 2,400 acres of Boeing-owned land at Santa Susana as open space habitat. This means that there will never be residential or agricultural development of the Santa Susana site. Boeing continues to work with a variety of educational and environmental organizations on research to promote new and innovative approaches to remediation and restoration, along with enhancing knowledge of the site’s ecology.

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        Site Tours

        Site tours

        Join the thousands of people who visit Santa Susana each year to watch red-tailed hawks soar and walk by towering rocket engine test stands that took human beings into the vast frontier of outer space. The site is a rare combination of natural beauty and historic significance for both Space Age endeavors and Native American culture.

        The California Department of Toxic Substances Control also maintains a calendar of upcoming events.

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          Frequently Asked Questions

          General

          Where is the former Santa Susana Field Lab?

          The 2,850-acre site straddles remote hills at the border of Los Angeles and Ventura counties between Chatsworth and Simi Valley, about 30 miles from downtown Los Angeles.

          What's special about the site?

          Santa Susana is located within a vital habitat linkage that connects the inland Sierra Madre Mountains to the Santa Monica Mountains to the Pacific Coast. It has many culturally-significant sites related to historic use by Native Americans, and a portion of the site is included in the National Register of Historic Places. Santa Susana was the proving ground for rocket engines that launched America into space and helped win the Cold War. The American Institute of Aeronautics and Astronautics identifies it as a historic aerospace site. It is a unique part of the cultural, environmental and technological fabric of California and the United States.

          What was the site used for?

          The site was historically used to test rocket engines for NASA and the military, and to perform non-military energy research at Department of Energy’s (DOE) Energy Technology Engineering Center (ETEC), for example, leading-edge nuclear, solar and energy-efficiency technology development.

          Who owns it?

          Santa Susana's 2,850 acres are divided into four administrative areas. Boeing acquired 2,398 acres in 1996 when it purchased Rockwell's aerospace and defense unit. The Department of Energy (DOE) owns several buildings on the 90 acres of Boeing property it leased and the U.S. Government owns 452 acres that are administered by the National Aeronautics and Space Administration (NASA).

          What does it look like today?

          Santa Susana is a vast hilltop natural area dominated by sandstone cliffs featuring oak woodlands, scrub and meadows, with valley and mountain vistas. Plant and animal species thrive at Santa Susana, including deer, bobcats, coyotes, cougars and raptors. A few decommissioned rocket engine test stands and other buildings still dot the landscape. Nearly 90% of historical buildings have been removed as operational activity at the Department of Energy’s Energy Technology Engineering Center was phased out in 1988 and rocket engine testing ended in 2006. Environmental and community groups and universities use the land for environmental research, restoration and recreation. Boeing hosts frequent bus tours and guided hikes to share the site's historical significance and cleanup progress.

          Is the site suitable for open-space habitat?

          Yes. Santa Susana – with its sandstone cliffs, oak woodlands, meadows, hills and streams – provides a rare and vital habitat and a crucial wildlife linkage in Southern California. The site has a unique history of Native American use and aerospace technological achievements. Because the site has these characteristics, in 2017, the North American Land Trust recorded a conservation easement to permanently protect the land as open space habitat.

          Boeing has partnered, and will continue to partner, with established organizations that share its open space vision. In addition, leading universities are engaged in environmental research at Santa Susana. The National Park Service is also studying the possibility of including the site in the Santa Monica Mountains National Recreation Area as part of its Rim of the Valley study.

           

          Conservation Easement

          What is the purpose of the conservation easement?

          The conservation easement ensures the preservation and protection of the unique and critical habitat, cultural resources and open space within nearly 2,400 acres of land that Boeing owns at Santa Susana. It is a legally enforceable property restriction that forever prohibits development or use of the land for residential or agricultural purposes. The land’s future as open space habitat will preserve the land as a wildlife corridor, will benefit local plants and animals (many of which are protected) and will preserve the many cultural resources. The conservation easement memorializes Boeing’s commitment for more than ten years to preserve the Boeing-owned property at Santa Susana site as open space to protect vital wildlife habitat and honor the land’s Native American history.

          Why did Boeing choose North American Land Trust to hold the conservation easement?

          North American Land Trust (NALT) is a respected, longstanding, experienced land trust that has protected 120,000+ acres and completed over 500 projects in 20 states since 1992. For more information about NALT, visit their website here.

          What is NALT's role as the conservation easement holder?

          As the holder of the conservation easement, North American Land Trust (NALT) monitors activities on the property to ensure the prevention of development and preservation of natural and cultural resources. NALT also has the authority to enforce the land use restrictions in court.

          How does the conservation easement affect the cleanup?

          The conservation easement does not affect the responsibility of Boeing, the Department of Energy or NASA to fulfill their respective cleanup requirements. It ensures there is no confusion about the future use of the Boeing property. Future land use is critical in determining the level of cleanup necessary to protect human health and the environment. The conservation easement legally secures the future of Boeing-owned land at Santa Susana as open space habitat. It ensures that, regardless of zoning or the desires of any future land owner, the site will never be used for residential or agricultural purposes. We remain committed to completing a cleanup that fully protects human health and the environment, consistent with the future use of Boeing’s property at Santa Susana as open space habitat.

          How does the conservation easement affect the Environmental Impact Report (EIR)?

          The conservation easement provides certainty that the only legally permitted future use of nearly 2,400 acres of Boeing-owned land at Santa Susana, now and forever, is open space habitat. The EIR should only consider cleanup scenarios consistent with that future use.

          Can the conservation easement be cancelled?

          The conservation easement is recorded in the Official Records of Ventura County and permanently "runs with the land," which means that it lasts and binds the property forever, regardless of who owns the property.

          Who can enforce the Conservation Easement? What happens if the Land Trust / Attorney General fails to enforce?

          Numerous parties have the right to enforce the provisions of the conservation easement recorded over Boeing’s property at Santa Susana. In addition to Boeing and the land trust easement holder (North American Land Trust) being able to enforce the restrictions on any current or future land owner or occupant of the property, the conservation easement also specifically provides that the California Attorney General and "any governmental authority with jurisdiction over the Property" are able to enforce the conservation easement. That would include not only the California Attorney General’s Charitable Trust Section, whose mission is to investigate and bring legal actions against charities that misuse charitable assets, but also agencies like DTSC, the LA Regional Water Quality Control Board, and Ventura County. As such, Boeing’s conservation easement is significantly stronger than other restrictive covenants or land use restrictions that the State of California enters into with landowners to restrict future property use at contaminated sites.

          Is creation of a conservation easement a tactic to avoid site cleanup?

          Absolutely not. The conservation easement clarifies the future land use so that appropriate cleanup decisions can be made to proceed. We have publicly stated for over a decade that we will clean up and restrict our property at Santa Susana to ensure it is preserved as open space to protect the important habitat, cultural and historical values at the site. The conservation easement makes Boeing’s commitment legally binding. We hope the conservation easement will reassure the public, and all who are committed to the preservation of the invaluable natural and cultural resources at Santa Susana, of our commitment to completing a cleanup that fully protects human health and the environment for the site’s future as open space habitat.

           

          Boeing Cleanup

          Where did the contamination come from?

          Santa Susana was at the center of research efforts after World War II to progress space exploration and protect the United States during the Cold War. In connection with these operations, chemicals were used and released into the soil and groundwater.

          What has Boeing done to clean up the site so far?

          Boeing is conducting extensive investigations and has conducted interim cleanup measures while building the scientific basis for cleanup pending final regulatory approval. Boeing has removed or treated 45,000 cubic yards of soil; analyzed 38,000+ soil and groundwater samples; drilled 260 groundwater monitoring and extraction wells; and dismantled more than 300 structures. In addition, Boeing has:

          • Installed a state-of-the-art groundwater treatment system;
          • Built stormwater containment and filtration systems designed in consultation with a panel of stormwater experts to meet water quality standards that in many cases are stricter than drinking water standards (although there is no human water consumption)
          • Restored 900 acres of land.

          What is the timeline for cleanup?

          In 2007, Boeing, NASA and the DOE signed a comprehensive cleanup agreement (“2007 consent order”) with the Department of Toxic Substances Control (DTSC). Boeing is committed to completing a cleanup that is fully protective of both human health and the environment, consistent with Santa Susana's future as open space habitat. Boeing continues to meet all of its obligations to implement the 2007 consent order. Here are key steps in the process:

          • The DTSC issues a certified, final site-wide Programmatic Environmental Impact Report (EIR)
          • DTSC approves the investigation reports previously submitted by Boeing
          • Boeing is preparing risk assessment reports for DTSC approval
          • When risk assessment is approved, Boeing will prepare a corrective measure study for DTSC approval
          • When corrective measure study is approved and finalized, DTSC will issue a statement of basis outlining the final cleanup plan
          • Boeing continues long-term groundwater cleanup and monitoring.
          • Boeing completes soil cleanup.

          What happens after the cleanup?

          Boeing secured a conservation easement that permanently preserves nearly 2,400 acres of Boeing-owned land at Santa Susana as open space habitat. Our vision is that Santa Susana will continue to be a place where mountain lions roam free, cultural artifacts remain undisturbed and oak woodlands have the opportunity to thrive.

          Will the cleanup be enough?

          Yes. We remain committed to a cleanup that is fully protective of human health and the environment, consistent with the land’s future use as open space habitat. Our cleanup will protect everyone who visits Santa Susana for recreational purposes and our neighbors in the surrounding community, as well as preserve unique wildlife habitat and protect important Native American cultural resources.

          Why does Boeing specifically exclude homegrown produce from its risk assessment? Does this mean that existing gardens at neighboring homes aren’t safe?

          Boeing recorded a conservation easement that permanently preserves nearly 2,400 acres of Boeing-owned land at Santa Susana as open space habitat. This easement ensures there will never be residential or agricultural development of the Santa Susana site.

          Based on extensive data collected over decades, there are no levels of contaminants from Santa Susana that would pose a risk for off-site gardens or for residents using those gardens now, and in the future. In an April 2013 letter to the Mayor of Simi Valley, the DTSC stated, "To date we have not found evidence of off-site contamination from SSFL that would pose a risk to human health or the environment."

          Boeing submitted a report to DTSC that included an estimate for a lifetime cancer risk of one in three. What does that mean?

          The reference is to a hypothetical risk prior to cleanup and is primarily attributable to naturally occurring arsenic. The hypothetical risk following cleanup at this location will be 1 in 1 million or less, a point clearly described in Boeing’s report. This calculation is just one among many that are considered in assessing the site and setting the ultimate cleanup level, and it is misleading to focus just on this calculation. The most important fact for the public to understand is that Boeing remains committed to completing a cleanup that is fully protective of both human health and the environment, consistent with the land’s future use as open space habitat.

          With regard to the risk calculation referenced above, there are two critical points that must be understood to properly interpret this calculation and comprehend what it means, and what it doesn’t mean.

          Assumption #1: The calculation assumes that no cleanup will ever be done. Fact: Boeing will perform a cleanup that is fully protective of human health and the environment, consistent with the land’s future use as open space habitat.

          Assumption #2: The calculation assumes that a person will live on the site and consume produce from a backyard garden. Fact: No one will ever live on Boeing’s portion of Santa Susana. North American Land Trust holds a conservation easement that permanently preserves nearly 2,400 acres of Boeing-owned land at Santa Susana as open space habitat.

          Is Boeing trying to avoid cleaning up to the agricultural standards for which the Santa Susana Field Laboratory is zoned?

          Future land use at Boeing’s property is controlled by the 2017 conservation easement, not zoning. Under the conservation easement, no agricultural use for human consumption will ever occur on the nearly 2,400 acres of land that Boeing owns at Santa Susana.

          Is it true that, even after cleanup, there will still be a remaining cancer risk for one out of five people?

          Following cleanup, contaminants from historic site operations that remain on Boeing’s property will be at or below levels that meet regulatory requirements for property used as open space habitat.

           

          Radiation

          Did the 2018 Woolsey Fire affect air quality beyond typical smoke associated with fires of this nature, specifically in releasing any radioactive material into the atmosphere?

          No. Data collected from Boeing air monitoring stations during the Woolsey Fire confirm that no man-made radionuclides were detected. The data, evaluated by an independent, State-certified laboratory, were consistent with any forest or brush fire where increased airborne particulate matter from smoke and fire is present. Only naturally-occurring radioactive material (NORM) was detected in the samples collected. The levels of NORM were well below regulatory standards for airborne radionuclides and well below general background levels in the United States, which are considered safe by the Nuclear Regulatory Commission (NRC). See “Boeing’s Radiological Air Monitoring Data Associated with the Woolsey Fire” here.

          Does the site have dangerous levels of radioactivity?

          No. The U.S. EPA completed a $42 million exhaustive radiological characterization survey of Area IV, the parcel of land where DOE operations took place and that is being cleaned up by DOE. The survey found that low levels of residual contamination from past civilian nuclear energy research affects approximately 40 acres of the 290 acres in Area IV. EPA’s measurements show that most of the radiation levels are lower than naturally occurring levels measured in nearby off-site locations. To read the EPA's study, visit EPA Radiological Characterization Study Results.

          Did the EPA find extensive contamination, including over 400 radiation "hot spots" in Area IV?

          The U.S. EPA conducted an exhaustive radiological characterization survey of Area IV between 2009 and 2012. The EPA described the survey as, “one of the most robust technical investigations ever undertaken for low-level radioactive contamination.” The results of the survey will help guide remediation efforts in Area IV.

          According to the EPA:

          • “In general, EPA found elevated radiation levels in the areas where we expected to find them, isolated to a number of former process or disposal areas.”
          • “Level of radiation throughout most of the Area IV study area was lower than the offsite background locations.”
          • “This survey resulted in the discovery of several areas of elevated radiation levels, but none posed a health risk to personnel.”
          • As part of the survey, the EPA took 3,735 soil samples and conducted over 128,000 separate analyses. In summary, the radiation levels found were limited and localized to certain former process and disposal areas. These results are in line with what would be expected for a facility of this type, which operated for many decades. No (0%) samples exceed the EPA acceptable risk range for open space land use.

          EPA Radiological Characterization Study Results fact sheet

          People are concerned that radiation has moved off-site to the Brandeis-Bardin Institute, Santa Susana Knolls, Moorpark and beyond. How can you be certain this is not the case?

          A 2007 study that compiled existing off-site data found no evidence of offsite radiological contamination. In an April 2013 letter to the Mayor of Simi Valley, the DTSC stated, “To date we have not found evidence of off-site contamination from SSFL that would pose a risk to human health or the environment.” More recently, DTSC stated in the Biannual April 2018 public meeting  that “DTSC has not found any evidence that contamination from [historical] operations at SSFL has posted or would pose a threat to human health or the environment outside the SSFL site boundaries”

          Have health studies concluded that there are higher cancer rates in San Fernando and Simi Valleys caused by radiation from the Santa Susana Field Laboratory?

          No. Since 1990, numerous studies conducted by government agencies, university researchers and others have examined cancer rates in the communities surrounding Santa Susana. It is not unusual for multiple studies to be conducted and come to different conclusions, which is why one must look at all of them. Taken together, the studies do not support a link between incidences of cancer and past operations at the Santa Susana Field Laboratory (SSFL).

          The two most recent studies were performed by Professor Lewis Morgenstern of the University of Michigan and Professor Thomas Mack of the University of Southern California Keck School of Medicine.

          A 2007 study by Professor Morgenstern concluded, “The results from this study suggest little or no association between residential distance from SSFL and the incidence of all cancers or the group of (radio-sensitive) malignancies thought to be affected by ionizing radiation. There was, however, a weak positive association during both follow-up periods between distance from SSFL and the group of (chemo-sensitive) malignancies thought to be affected by exposure to chemicals used at Rocketdyne.” The study further concluded, “Furthermore, we have no direct evidence that the associations we observed, even if they reflect real differences among the three regions, necessarily reflect the effects of environmental exposures originating at SSFL.”

          A 2014 study by Professor Mack concluded, “No evidence of measurable offsite cancer causation occurring as a result of emissions from the SSFL was found. Further, no evidence of any cancer causation by any environmental factor was found.” Dr. Mack presented his findings at a DTSC public meeting in April 2014.

          An overview of epidemiological and community health studies can be found here.

          Is it true that 300 times permissible concentrations were released during the Sodium Reactor Experiment accident?

          This is not true. Many people have made various statements about the 1959 Sodium Reactor Experiment incident using assumptions that are not supported by facts and data.

          What we do know is the incident occurred at a time when the area around the Santa Susana Field Laboratory was still sparsely populated. Records were kept of the levels that were released and used to calculate potential exposure dose. The total radiation doses for the two month period following the SRE accident were 0.099 millirem for a hypothetical person at the Santa Susana site boundary, and 0.018 millirem for a hypothetical person at the location of the nearest resident in 1959 (1.33 miles away).

          These doses are a fraction of the permissible exposure level in 1959, and today’s more restrictive federal limits, including the Nuclear Regulatory Commission and Department of Energy exposure limits for nuclear facilities (100 millirem/year) and the U.S. EPA limit for airborne emissions (10 millirem/year). Nuclear operations at Santa Susana ended decades ago. The SRE accident has been the subject of extensive study and commentary. Here is some additional information about the incident:

          Energy Technology Engineering Center website
          Department of Energy SRE Workshop
          Annual Site Environmental Reports, 1955-present

          Were there any "secret releases of radiation" at the Santa Susana Field Laboratory?

          No. Radiation releases were monitored, measured and documented in compliance with federal regulations. The Santa Susana Field Laboratory continually monitored the site for potential releases and reported the results of its monitoring. The results of this sampling were documented in annual monitoring reports.

          Copies of annual site environmental reports for Area IV of Santa Susana Field Laboratory from 1955 through 2014 are available on the Energy Technology Engineering Center website.

          Were barrels of radioactive waste disposed at the burn pits in Area IV?

          Barrels of sodium and other chemicals were disposed of in the Area IV Burn Pit during the 1950s, 60s and 70s in compliance with existing regulations at the time. Subsequent site investigations showed that the Area IV Burn Pit did become radiologically contaminated. It was remediated during the 1990s and released for unrestricted use (i.e. declared clean) in 1998 by the California Department of Health Services (now Department of Public Health).

           

          Health Studies

          What were the results for the state study on Santa Susana Field Laboratory workers? Is it true that the studies found higher cancer rates?

          There have been two worker health studies at Santa Susana. A 1997-1999 study of Rocketdyne workers conducted by UCLA was extensively reviewed by a number of experts who questioned the study’s methodology. As a result, Boeing and the United Aerospace Workers Union (UAW) sponsored a second worker health study that was conducted by the International Epidemiology Institute and overseen by an independent Science Committee comprised of nationally renowned public health and epidemiological experts.

          This study, which was completed in 2005 and updated in 2011, was peer reviewed and published in the Journal of Radiation Research. It stated, “The extended follow-up reinforces the findings in the previous study in failing to observe a detectable increase in cancer deaths associated with radiation, but strong conclusions still cannot be drawn because of small numbers and relatively low career doses.” The Science Committee likewise concluded that, “The Rocketdyne workforce had a much lower overall mortality than the rate observed in the California population. There is no evidence that working conditions caused increased mortality in the Rocketdyne workforce.”

          International Epidemiology Institute Worker Health Study Executive Summary
          Information about UCLA Worker Health Study

          Did a UCLA study find evidence of significant offsite exposures to hazardous chemicals and radioactivity from the Santa Susana Field Laboratory?

          No. The authors of the UCLA study did not conduct any soil, air or other environmental testing that would provide information about conditions that exist today, either on or offsite. The study is primarily a review of limited, historical information. In addition, the study was not subject to peer review and several experts have questioned its methodology.

          Comments from Boeing and other experts on the UCLA study can be found here.
          One study that did involve actual sampling was the onsite radiological characterization survey of Area IV of the Santa Susana Field Laboratory that the U.S. EPA conducted between 2009 and 2012. The EPA described the survey as, "one of the most robust technical investigations ever undertaken for low-level radioactive contamination." In summary, the radiation levels found onsite were limited and localized to certain former process and disposal areas. These results are in line with what would be expected for a facility of this type, which operated for many decades.

          Final EPA Radiological Characterization Reports

          Dr. Morgenstern says his study found that cancer rates in the community are 60% higher within two miles of the site than farther away. What is your response?

          Dr. Morgenstern's report states: “There is little or no association, for total cancers and radiosensitive cancers among adults.” For the few cancers for which higher rates were reported, the report concludes that "There is no direct evidence from this investigation, however, that these observed associations reflect the effects of environmental exposures originating at SSFL."

          And in his April 2014 study of area cancer rates, Dr. Thomas Mack of USC Keck School of Medicine concluded: "no evidence of measurable offsite cancer causation occurring as a result of emissions from Santa Susana."

          If there is no health impact, why did Rocketdyne/Boeing settle prior lawsuits?

          Settlements of this nature are common and occur for a number of reasons unrelated to the merits of the claims being asserted. It is important to note that the overriding conclusion of numerous health studies is that people living near Santa Susana are not at increased risk for developing cancers as a result of past operations.

          Stormwater Technical Library

          Stormwater at Santa Susana is regulated under a National Pollutant Discharge Elimination System permit issued by the Los Angeles Regional Water Quality Control Board. Under the current permit, several outfall locations require routine monitoring for various constituents. Boeing provides this library of technical documents about the site-wide stormwater management program as a public service on behalf of the Regional Board.

          Human Health Risk Assessment for Surface Water Runoff

          Boeing will conduct a Human Health Risk Assessment (HHRA) of runoff from the former Santa Susana Field Laboratory property via the southern outfall locations. The HHRA will provide a quantitative evaluation of potential risks associated with exposure to discharges from the Santa Susana site, which are regulated by the National Pollutant Discharge Elimination System permit.

          Revised Human Health Assessment Work Plan
          Final HHRA cover letter
          Final HHRA

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          Permits
          Monitoring Reports
          Interim Source Removal Action (ISRA)
          Technical Reports