Aniak White Alice Site
Database Name: Aniak White Alice Site/Middle School
Latitude: See database entries
Longitude: See database entries
DEC Contaminated Sites contact: John Halverson, Project Manager for Aniak, Contaminated Sites Program, Spill Prevention and Response Division, Alaska Department of Environmental Conservation, 555 Cordova St., Anchorage, AK 99501-2617 (907) 269-7545, (907) 269-7649 Fax
Contacts updated: July 1, 2014
Summary updated: July 1, 2014
Click on photos or maps for larger versions.
DescriptionAniak, pop. 546, is located on the south bank of the Kuskokwim River at the head of Aniak Slough in the Yukon-Kuskokwim Delta. Aniak lies 92 air miles northeast of Bethel and 317 miles west of Anchorage.
The site was initially developed and used by the Air Force in the 1950s in the military/civilian "White Alice" Communication System (WACS) during the Cold War. By the late 1970s the military facility was obsolete and was turned over to the Kuspuk School District, which renovated the main building and has used it as a school since 1983. The Alaska Department of Transportation and Public Facilities has owned the property since 1965 and leases the site to the Kuspuk School District and ALASCOM, Inc.
During White Alice operations and renovation of the school by contractors, fluids containing polychlorinated biphenyls (PCBs) were spilled in and around the generator room and onto the ground outside the building, resulting in soil contamination. Hazardous materials were placed into drums that were moved to various locations on the property, where additional spills reportedly occurred. Most of those drums were ultimately shipped to a disposal facility out of state.
The U.S. Air Force and Alaska Department of Environmental Conservation conducted PCB cleanup at the site between 1979 and 1983 and attempted to remove all PCB-contaminated material and soil containing more than 50 parts per million (ppm) PCBs. Roughly 80 tons of PCB-contaminated soil were excavated and shipped to a permitted disposal site, along with numerous drums of other wastes. In 1981, a sealant was applied to the floor of the former generator room. In later years, the generator room was used as a wood shop, and a better sealant was added to the floor in 1983.
Super sacks filled with contaminated soil outside the Joe Parent School building await shipment to an off-site permitted disposal facility. (Shannon and Wilson photo)
In 1994, DEC was notified of additional drums and possible contamination at the site. DEC staff inspected the site in 1996 and observed about 60 drums in alders between the former WACS building, now the Joe Parent School building, and the airport runway. The U.S. Army Corps of Engineers tested the ground beneath the drums and documented petroleum contamination. Since the land was used but no longer owned by the military, the Army Corps of Engineers assumed responsibility for the military's portion of the contamination under the “Formerly Used Defense Site Program.”
In 1997, the U.S. Environmental Protection Agency (EPA) released a report that showed PCBs remained in soil outside the school wood shop. Subsequent sampling inside the school documented that PCBs had been tracked into the building. With DEC oversight, the Corps’ contractors cleaned the inside of the Joe Parent School building and covered PCB-contaminated soil outside the school with a temporary liner and 6 inches of clean soil. The cover was put in place to ensure that people would not come in direct contact with contaminated soil and to prevent the tracking of PCBs into the school or other areas. DEC mailed several fact sheets to all Aniak post office box holders in 1997 and 1998 to inform the community of the investigation and cleanup efforts. A public meeting was held in Aniak in January 1998 to discuss the issues and answer questions.
A health study in 1998 tested some of the school's students, faculty and maintenance staff. The data showed that students and faculty involved in the tests did not have any measurable levels of PCB in their blood serum. Serum samples from some of the cleanup workers and maintenance staff contained detectable PCB levels; however, they were found to be within commonly observed levels for Americans and were far below levels that have been shown to have toxic effects. The report concluded that residents have not been exposed to harmful levels of PCBs at the site, but that PCBs should still be cleaned up to appropriate levels. The results were summarized in a Health Consultation report that the U.S. Agency for Toxic Substances and Disease Registry issued in 1999. (See report below.)
The excavation and removal of PCB-contaminated soil is shown outside the Joe Parent School building in 2001. (Shannon and Wilson photo)
Since 1998, DEC has been working with the potentially responsible parties (PRPs) for contamination at the site. The PRPs include the federal government, the State of Alaska (as the landowner), the Kuspuk School District, and, since 2004, the Air Force contractors that operated the White Alice site. However, due to disagreement between the PRPs on how to fund and who should conduct the necessary site characterization and cleanup, work has been delayed. Because the site is used as a school and due to community concerns, DEC has taken the lead on several additional steps to characterize and clean up the contamination.
Between 1998 and 2001, DEC hired contractors to better characterize the extent and location of remaining PCB contamination adjacent to the wood shop and to clean up a portion of the site. Roughly 870 tons of PCB-contaminated soil were excavated and shipped off-site for disposal. The PCB-contaminated soil that remained in the area was under the temporary cap (a liner and clean soil); therefore, there was no current exposure to it. (See report below, “PCB Cleanup, Aniak Middle School,” Shannon and Wilson, December 2001.)
In 2002 and 2003, DEC hired a contractor to complete a feasibility study to evaluate seven different alternatives for completing the cleanup. Excavation and off-site disposal of soil containing more than 1 ppm PCBs was recommended as the best overall alternative when considering regulatory compliance, protection of human health and safety, implementability, effectiveness and cost. (See report below, “Feasibility Study for Treating PCB-Impacted Soil,” January 2004.)
In 2004, the Alaska Department of Law sent letters to the potentially responsible parties asking to be reimbursed for the state’s past costs for responding to the PCB contamination and requesting they complete the cleanup as outlined in the feasibility study report. The Department of Law said that if the state wasn’t reimbursed, the state would conduct the cleanup and seek full cost recovery.
The PRPs responded by requesting the State of Alaska to provide time for them to conduct a separate feasibility study, as they did not concur with the existing one. The State allowed the extra time. URS Corporation, under contract with the private PRPs, completed a separate feasibility study report. That report recommended excavation and off-site disposal of soil with PCBs greater than 10 ppm, capping all soil where PCBs remain at concentrations between 1 and 10 ppm, and development of institutional controls to ensure the cap is maintained indefinitely.
Since 2004, DEC, the Department of Law and the PRPs have been negotiating through an alternative dispute resolution process in an effort to reach a settlement agreement on the past and future cleanup costs and work. Extensive record reviews and information exchanges were completed, witness lists were created, depositions were held, and negotiations are continuing. Questions were also raised about PCB contamination in and potentially around the White Alice site septic system.
Drums on the site as they appeared before the U.S. Army Corps of Engineers removed them in August 1998.
In 2008, DEC hired a contractor to complete the PCB cleanup work and further characterize the source and extent of TCE contamination. The cleanup objectives were to remove all soil containing more than 1 ppm PCBs and related cleanup wastes to a permitted disposal facility in the Pacific Northwest. The results:
- The septic tank contained elevated levels of PCBs and TCE; the tank and contents were removed and disposed of properly.
- A significantly larger volume of PCB-contaminated soil than expected was found behind the Joe Parent School building, near an old septic system and a concrete truck loading rack for the fuel storage system that was installed in 2005.
- More than 2,300 cubic yards of PCB-contaminated soil and wastes were removed.
- Floors inside the Joe Parent School building were sampled for PCBs. In the wood shop, in an area where the floor sealant was damaged, PCBs were found above applicable federal standards. Other areas in the wood shop where the sealant was in good shape tested clean, as did floors in other areas inside the building. The Kuspuk School District then resealed and painted the woodshop floor.
- PBC-contaminated soil remains behind a fenced area on the west side of the building and underneath the fabric liner and gravel cover on the east side of the building; these areas will need to be cleaned up in the future.
- TCE-contaminated soil and groundwater warrant further investigation and cleanup.
In 2009, DEC contracted the response actions listed below.
- A Vapor Intrusion Assessment was conducted to determine whether TCE vapors were moving up through the soil into the Joe Parent School building. The results documented elevated TCE concentrations in soil gas beneath the building and TCE in the indoor air at concentrations above risk-based screening levels.
- A Vapor Intrusion Mitigation Alternatives Analysis was conducted to evaluate various methods to stop or minimize TCE vapors from moving into the building. A final Vapor Intrusion Mitigation Analysis report was submitted in October 2009. It supported installing and operating a sub-slab depressurization system beneath the Joe Parent School building to create and maintain a negative pressure beneath the building, thus limiting upward movement of TCE vapors into the building. Modification to the heating and ventilation (HVAC) system were recommended in increase air exchange rates in the building.
- Additional Site Characterization was conducted to estimate the amount of PCB-contaminated soil remaining on-site and to determine the extent and location of TCE-contaminated soil and groundwater. The report included the following conclusions:
- Roughly 3,550 cubic yards of PCB-contaminated soil (greater than 1 ppm PCBs) remain on-site.
- Two apparent sources of TCE contamination are the former WACS septic system and a floor drain or spill associated with the maintenance building.
- Groundwater levels fluctuate significantly according to the season, the groundwater gradient is very flat and the flow direction varies seasonally.
- TCE-contaminated groundwater at the site is localized to an area around and beneath the maintenance building and Joe Parent School building; the plume does not appear to have migrated off-site and has not impacted either of the two drinking water wells on the property.
- A range of potential cleanup alternatives and cost estimates was developed.
In 2010, DEC contracted to have a sub-slab depressurization system designed, constructed and installed at the Joe Parent School building. The system began operating in September 2010 and DEC continued to operate it through 2012. Quarterly Vapor Intrusion Mitigation Operations, Maintenance and Monitoring reports were prepared. Here’s what happened:
- The depressurization system appears to create a negative pressure beneath the building when operating effectively.
- TCE concentrations in soil gas beneath the building have decreased significantly.
- TCE concentrations in indoor air decreased initially (due in part to modification of HVAC operations, the indoor air filters and the depressurization system) but they have fluctuated and have not been reduced to below target levels throughout the building.
During 2011, DEC contracted to have a Groundwater Feasibility Study conducted to further evaluate cleanup alternatives for TCE-contaminated groundwater. The report was finalized in June 2012 and concluded:
- Air Sparging scored low on effectiveness.
- Monitored Natural Attenuation would be the most cost effective alternative, but it is unclear whether it would achieve cleanup levels.
- Enhanced Reductive Dechlorination may be more effective, but would cost more.
- In-situ Chemical Oxidation would be likely be more effective and it would achieve cleanup levels over a shorter time period, but it appears to be the most expensive.
- Additional characterization and soil cleanup are recommend prior to selecting a groundwater remedy.
Early in 2012, DEC informed the Kuspuk School District and other PRPs that DEC would not continue to fund the operation and monitoring of the sub-slab depressurization system, ongoing air monitoring or the remaining TCE and PCB cleanup work, and that the PRP group needs to pay for and conduct those activities along with reimbursing DEC for all prior expenses. DEC has expended nearly $7 million on characterization and cleanup work at the site to date.
DEC conducted its final operations and maintenance work and air monitoring in May 2012 and continued to pay for operation of the depressurization system through the end of 2012.
The school district continued to operate the depressurization system during 2013, but did not have funding for air monitoring. In March 2013, the school district decided to temporarily close the Joe Parent School building until it worked with the PRP group to fund and conduct further monitoring and verify that TCE levels in the building are below levels of concern. (See the link to the school district's March 2013 notice below.)
In September 2013, the PRP group finalized an interim agreement on operating, maintaining and monitoring the vapor intrusion mitigation system. The school district contracted to have a workplan developed and implemented. DEC approved the workplan on Oct. 7, 2013. Initial monitoring results indicate the TCE concentrations are continuing to decrease; however, the Kuspuk School District is awaiting further monitoring results prior to deciding to reopen the building.
The PRP group is negotiating a settlement agreement on funding and conducting the remaining PCB cleanup work and a separate agreement on addressing the remaining TCE contamination.
A septic trench is dug in Aniak in October 2006 to allow for sampling. The trench was backfilled after sampling.
Public Health and Environmental ConcernsPolychlorinated biphenyls (PCBs) and trichloroethylene (TCE) are the primary contaminants of concern at the site.
PCBs are stable, heat tolerant materials that were added to electrical transformer oils to extend the time that the oil was usable. PCBs were also used in other materials including other electrical equipment, some caulk, paints, sealants and hydraulic fluids. In the late 1970s, manufacture and use of PCBs in new products was banned in the United States in response to concern over possible health and environmental effects.
TCE is a nonflammable, colorless liquid with a somewhat sweet odor and a sweet, burning taste. It is used mainly as a solvent to remove grease from metal, but it is also an ingredient in adhesives, paint removers, typewriter correction fluids and spot removers.
The two school water supply wells on-site and nearby residential drinking water wells have been sampled several times and have consistently met drinking water standards.
Potential health effects from exposure to contaminants are dependent on the concentrations of contaminants people are exposed to, how frequently and over how long of a time period they are exposed, and how they are exposed (skin contact versus breathing or ingesting the material). Other factors that may influence effects are the other chemicals people are exposed to and their age, sex, diet, family traits, lifestyle and their overall state of health.
Potential health effects from exposure to TCE include:
- Breathing small amounts may cause headaches, lung irritation, dizziness, poor coordination and difficulty concentrating.
- Breathing large amounts of TCE may cause impaired heart function, unconsciousness and death. Breathing it for long periods may cause nerve, kidney and liver damage.
- Drinking large amounts of TCE may cause nausea, liver damage, unconsciousness, impaired heart function or death.
- Drinking small amounts of TCE for long periods may cause liver and kidney damage, and impaired immune system function.
- Pregnant women exposed to TCE during the first trimester of pregnancy may have an increased risk of impaired fetal development, although the extent of some of these effects is not yet clear.
- Skin contact with TCE for short periods may cause skin rashes.
Potential health effects from exposure to PCBs include:
- The most commonly observed health effects in people exposed to large amounts of PCBs are skin conditions such as acne and rashes. Studies in exposed workers have shown changes in blood and urine that may indicate liver damage. PCB exposures in the general population are not likely to result in skin and liver effects. Most of the studies of health effects of PCBs in the general population examined children of mothers who were exposed to PCBs.
- Animals that ate food containing large amounts of PCBs for short periods of time had mild liver damage and some died. Animals that ate smaller amounts of PCBs in food over several weeks or months developed various kinds of health effects, including anemia, acne-like skin conditions, and liver, stomach and thyroid gland injuries. Other effects of PCBs in animals include changes in the immune system, behavioral alterations and impaired reproduction. PCBs are not known to cause birth defects.
Both TCE and PCBs are considered to be probable carcinogens.
- Kuspuk School District’s March 2013 notice to the public, Closure of Joe Parent Vocational Center – (PDF 54.8K).
- Focused Feasibility Study – Groundwater, Aniak Middle School, June 2012 – (PDF 30.5MB).
- Fact sheet, August 2009, with update on contamination and cleanup efforts. (PDF 888K).
- Letter to Aniak residents, June 2009, from DEC, updating residents on progress. (PDF 176K).
- Letter to Aniak residents, Aug. 18, 2008, from DEC, updating residents on progress. (PDF 741K).
- Letter to Aniak residents, May 9, 2008, from DEC, describing the plans for the summer of 2008. (PDF 821K).
- Septic System and Area F Characterization, Former White Alice Communication System, Aniak, May 2007, without Tables and Appendices (PDF 1.9MB).
- Feasibility Study for Treating PCB-Impacted Soil, Aniak Middle School, Shannon and Wilson, January 2004 (PDF 1.5MB ).
- PCB Cleanup, Aniak Middle School, Shannon and Wilson, December 2001, (PDF 1MB )
- 1999 Health Consultation Aniak Middle School Report, by the Alaska Department of Health and Social Services under cooperative agreement with the U.S. Agency for Toxic Substances and Disease Registry (PDF 344K).
- 1983 Memorandum of the State Epidemiologist's Investigation of PCBs in Aniak, Dec. 19, 1983, by John Middaugh, M.D. (PDF 460K).
General DEC Fact Sheets
"Additional Information About Exposure to TCE," (January 2014) – (PDF 94K).
“Cleanup Process for Contaminated Sites,” (March 2009) – (PDF 304K).
“How DEC Makes Cleanup Decisions,” (June 2009) – (PDF 20K).
“Introduction to Groundwater,“ (June 2009) – (PDF 412K).
“Understanding Contaminant Concentrations,” (June 2009) – (PDF 164K).
“Department of Defense Cleanups,” (June 2009) – (PDF 59K).
“Environmental Laws and Regulations,” (June 2009) – (PDF 39K).
“Environmental Cleanup Methods,” (June 2009) – (PDF 171K).
“Human Health Risk Assessment,” (June 2009) – (PDF 78K).
“Common Alaska Contaminants and their Sources,” (June 2009) – (PDF 240K).