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Site Report: ADOT&PF Gustavus Airport Sitewide PFAS

Site Name: ADOT&PF Gustavus Airport Sitewide PFAS
Address: Gustavus Airport, Gustavus, AK 99826
File Number: 1507.38.017
Hazard ID: 26904
Status: Active
Staff: Danielle Duncan, 9074655207
Latitude: 58.422636
Longitude: -135.700232
Horizontal Datum:WGS84

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.


The Alaska Department of Transportation and Public Facilities (ADOT&PF) detected two per and polyfluoroalkyl substances (PFAS) compounds perooctanesulfonic acid (PFOS) and Perfluorooctanoic acid (PFOA) in groundwater at two public water system wells near the airport in Gustavus in July 2018. Concentrations of PFOS exceeded the EPA's lifetime health advisory (LHA) levels in public water system ID AK 2111476 known as “Gustavus Airport.” Concentrations of PFOS and PFOA were below the Lifetime Health Advisory (LHA) in public water system ID AK 2130596 known as “Gustavus Water System” that provides water to the National Park Service housing and also to the Gustavus School. The contaminants are believed to have originated from the historic use of Aqueous Film Forming Foam (AFFF) at various locations at the Gustavus Airport Investigation and public outreach are on-going. DOT&PF is working with an environmental consulting firm, Shannon & Wilson, Inc., and the Alaska Department of Environmental Conservation (DEC) to identify and sample private water wells that may have been affected. Water is being provided for well owners with PFAS (sum of five PFAS compounds) greater than or equal to 65 parts-per-trillion. For more information visit the ADOT&PF Gustavus webpage:

Action Information

Action Date Action Description DEC Staff
8/14/2018 Site Added to Database A new site has been added to the database Mitzi Read
8/24/2018 Public Notice A public information meeting + Q&A about PFAS in the groundwater at the Gustavus Airport and a community well will be held at the Gustavus Library on Monday, August 27, 2018 at 5:30-7:00 pm. The Alaska Departments of Transportation, Environmental Conservation, Health and Social Services, and Administration will provide information. Independent environmental consulting firm, Shannon & Wilson, will attend to schedule sampling times for properties south of the airport. More info at Danielle Duncan
9/6/2018 Update or Other Action Shannon and Wilson has sampled 44 groundwater wells, the two wells previously sampled, and 3 surface water locations in the area for 6 PFAS compounds. A rush on the analysis was requested for 10 samples and the other results will follow. Danielle Duncan
9/18/2018 Potentially Responsible Party/State Interest Letter Sent today~ Danielle Duncan
9/21/2018 Report or Workplan Review - Other Shannon & Wilson (S&W) has completed the first round of PFAS groundwater contamination delineation. PFAS discovered in several wells on the Gustavus Airport property and three private wells off property are reported in concentrations above DEC action levels (65 parts-per-trillion (sum of five PFAS compounds)). Concentrations at most private wells and the well which serves the National Park Service water system are below DEC action levels. S&W has expanded the sampling area to wells east and west of the airport. Water is being provided for people whose wells exceed the action level. For more information visit the ADOT&PF Gustavus webpage: Danielle Duncan
9/21/2018 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 80270 name: ADOT&PF Gustavus Airport Sitewide PFAS Danielle Duncan
10/23/2018 Report or Workplan Review - Other The second PFAS sampling event from areas east and west of the initial investigation were received. There are a total of four groundwater/drinking water wells on the airport property and 12 off-airport property with PFAS levels greater than the 65 ppt action level. DOT has provided bottled water to the affected property owners. Further sampling is going to occur in areas west across Salmon River (Area 6) and south (Area 7) of the current sampling area. The DOT Gustavus Airport PFAS website has been updated with a sampling map. In addition, a second public meeting will be held at the Gustavus School on October 30, 2018 from 5 to 6:30 pm. Danielle Duncan
10/30/2018 Meeting or Teleconference Held The second public meeting was held in Gustavus by members of the DEC, DOT, HSS, DOA, and ATSDR to present the latest data, listen to the community's concerns, answer questions, and provide health and regulatory information. Danielle Duncan
11/26/2018 Update or Other Action Sampling was completed west across Salmon River (Area 6) and south (Area 7) of the current sampling area. The results found only one new exceedance of the ADEC Action Level located within the original search area. Shannon & Wilson, Inc. doesn’t plan to expand their sampling area any further as the plume is delineated at this time. As they move more south the most prominent compound is PFHxS. This compound is typically smaller and moves faster than other PFAS compounds which is why it’s most prevalent closer to the edge of the plume. Shannon & Wilson clarified that we may have only defined the plume within the shallow drinking-water zone. Which means the contamination will need to be further defined in deeper aquifers for the purposes of site characterization through different depths of monitoring wells. BARR Engineering, Shannon & Wilson and Risk Management are working together to determine what the best long-term solution is for this community. Residents will continue to receive alternate water until a long-term solution is in place. Danielle Duncan
12/20/2018 Update or Other Action Per S&W, the Gustavus Community Garden well (PW-430) was sampled during the last sampling event and was non-detect across the board for the six PFAS analytes. Danielle Duncan
12/26/2018 Update or Other Action The DOT is working on getting a new contract in place to continue characterization work. Danielle Duncan
2/15/2019 Update or Other Action The DOT is planning on doing some improvements to the airport in the next year or two that were planned prior to the discovery of PFAS contamination. Danielle Duncan
2/26/2019 Update or Other Action Per the DOT, the contract for site work is in the finalization phases and was awaiting signatures. Danielle Duncan
3/14/2019 Update or Other Action The first round of quarterly groundwater monitoring for wells having concentrations greater than or equal to 35 parts-per-trillion (ppt) has been completed. Twenty drinking water wells were sampled last week as part of this effort. An additional eight wells were sampled within 500 feet of the quarterly monitored wells as a step-out effort. Two surface water samples were also collected from Glen's Ditch where the firetrucks collect water. The ADEC should receive a finalized copy of the report to review in the future. Danielle Duncan
3/22/2019 Report or Workplan Review - Other The surface water PFAS results for Mt View Rd creek and the gravel pits were both non-detect. The sampling was not part of the characterization effort - rather screening for a location to fill the fire truck. Danielle Duncan
3/28/2019 Report or Workplan Review - Other Received, reviewed, and provided comments on the Summary Report August 2018 to November 2018 Private Well Sampling this date. Waiting for a revised report. Danielle Duncan
3/29/2019 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 80270 ADOT&PF Gustavus Airport Sitewide PFAS. Danielle Duncan

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