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Site Report: Residence - 77 Same Old Road Gustavus

Site Name: Residence - 77 Same Old Road Gustavus
Address: 77 Same Old Road, Gustavus, AK 99826
File Number: 1507.38.018
Hazard ID: 26933
Status: Active
Staff: Kelly Walker, 9074512166 kelly.walker@alaska.gov
Latitude: 58.414732
Longitude: -135.707890
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.

Problems/Comments

During the groundwater investigation of the Gustavus Airport Per- and polyfluoroalkyl substances (PFAS) release as a result of the use of aqueous film forming foam (AFFF), the groundwater at the residence was analyzed for PFAS and the results were above the ADEC cleanup level. Release to ground surface infiltrating to groundwater resulting from fire fighting foam used by the City of Gustavus during a response to a brush fire on 5/18/15.

Action Information

Action Date Action Description DEC Staff
10/8/2018 Site Added to Database A new site has been added to the database Evonne Reese
10/11/2018 Update or Other Action The City of Gustavus is working with other parties and the residence has been provided with alternative drinking water. Continuing investigation is on-going. Danielle Duncan
10/12/2018 Potentially Responsible Party/State Interest Letter Sent a letter package (potentially responsible party letter, questionnaire, and work plan request) this date to the responsible party. Danielle Duncan
10/12/2018 Workplan Requested Work plan requested to submit a site characterization work plan for ADEC review pursuant to 18 AAC 75.335 and 75.355 developed by a qualified environmental consultant to delineate the extent of soil and groundwater contamination within 60 days of receipt of this letter. In addition, because the groundwater PFOS concentration of 47,000 parts-per-trillion exceeds the action level, as the responsible party, the City is required to provide an alternative drinking water source. It is the ADEC’s understanding that ADOT is currently providing bottled water to the residence and the City is working with the homeowners on an interim solution involving their current cistern. Additional action will be needed to ensure an adequate long-term alternative water source is provided to the property. A plan for providing a long-term water source will need to be developed in consultation with the homeowners and ADEC. Danielle Duncan
10/23/2018 Document, Report, or Work plan Review - other Second sampling results for the groundwater well (320 parts-per-trillion (ppt)) and cistern (4,700 ppt) were significantly lower than initial results and the investigation is on-going. The post-point-of-use water filter sample (6.5 ppt) was below the PFAS action level. The residence is being provided with bottled water. Danielle Duncan
10/30/2018 Meeting or Teleconference Held Site visit and meeting with the homeowners to discuss the discharge of the cistern and hot tub water which is contaminated with PFAS. The cistern liner and other components of the system will be replaced with new materials. The home is being supplied with bottled water until a long-term solution can be developed. Danielle Duncan
11/16/2018 Workplan Requested A letter was sent out today certified # 7017 2400 0000 6055 2036 requesting that the City of Gustavus let the ADEC know if the City plans on doing the site characterization work requested on October 12, 2018, otherwise the ADEC will take the lead and do the work. Danielle Duncan
12/11/2018 Update or Other Action The DEC is currently working with the City of Gustavus to carry out further sampling and characterization as soon as possible. Danielle Duncan
1/14/2019 Update or Other Action The test for the water from the indoor pipes is scheduled for tomorrow. Ahtna is doing the test. The City ordered the drinking water once ADOT informed the property owners they would no longer be providing it. Danielle Duncan
2/15/2019 Update or Other Action The results for the kitchen faucet post carbon filtered cistern water for PFAS (sum of six compounds per ADEC memo) are 2 parts-per-trillion (ppt) and with the additional filtration added to the faucet taps, the PFAS should be non-detect. Additional rain catchment is likely to be added. The well had a PFAS (sum of six compounds) concentration of 13,000 ppt. Danielle Duncan
5/9/2019 Update or Other Action Weston Solutions has been contracted to perform drinking water sampling, soil characterization, and groundwater sampling. A work plan is currently being drafted. Tentative field work to occur the week of May 27. Danielle Duncan
6/27/2019 Site Characterization Workplan Approved Approved the Work Plan for Site Characterization of PFAS Residence – 77 Same Old Road Gustavus, Alaska this date. The approved work consists of soil, drinking water, and groundwater sampling. The work plan is available for viewing and download in the attachments section. Danielle Duncan
7/22/2019 Update or Other Action Weston has completed the site activities. Danielle Duncan
2/5/2020 Document, Report, or Work plan Review - other ADEC received the draft Site Characterization Report from Weston Solutions as part of the State lead investigation on 2/5/2020. During the site investigation 18 groundwater wells were sampled, 30 surface soil samples were collected, and 8 residential drinking water wells were sampled. PFAS compounds were detected in 12 of the groundwater wells and exceeded ADEC cleanup in 4 of the wells. PFAS was found in 4 of the drinking water wells and exceed EPA lifetime health advisory action level of 0.070 micrograms per liter in one well with a concentration of 2.83 ug/L. Soil samples in the AFFF area and garden area were above ADEC table B1 migration to groundwater cleanup levels. Soil in the berry picking area did not exceed cleanup levels. Soil in the AFFF application area had PFOS between 0.888 mg/kg and 0.00323 g/kg, which is above the migration to groundwater cleanup level but below the human health cleanup level. One soil sample in the AFFF application area had PFOA at 0.00206 mg/kg, which above migration to groundwater cleanup levels and below human health cleanup levels. Erin Gleason
2/20/2020 Document, Report, or Work plan Review - other ADEC was reviewed the report and requests revisions. Revisions are due 3/19/2020. Erin Gleason
2/28/2020 Meeting or Teleconference Held Meeting with home owners to discuss the 2020 report and plans for groundwater treatment in summer 2020. Erin Gleason
3/4/2020 Meeting or Teleconference Held Meeting with adjacent property owners to discuss summer 2019 sampling results and path forward. Erin Gleason
3/19/2020 Site Characterization Report Approved Received revised report from Weston on3/17/2020. All requested changes have been made, report approved. Report has been placed under the documents tab of the database for public access. Erin Gleason
12/3/2020 Update or Other Action ADEC put out a request for proposals in fall 2020 to term contractors. Five proposals were received and evaluated by a committee of ADEC staff. Shannon and Wilson Inc. was selected to conduct work at the site. The work includes sampling groundwater and sampling drinking water at least once a year for 2020, 2021, and 2022. The results from the previous year will dictate what is sampled the following year. As part of this work, there is also an optional task for the installation of an alternate drinking water well upgradient of the PFAS plume on 77 Same Old Road for residential use and optional task for groundwater remediation. Results from 2020 will help determine if groundwater remediation is needed in 2021. Erin Gleason
12/3/2020 Document, Report, or Work plan Review - other Received draft work plan from Shannon and Wilson for work outlined in the TRFP. The work plan was provided to the two impacted property owners on 12/4/2020 for review. ADEC approved the work plan on 12/9/2020. Erin Gleason
1/26/2021 Update or Other Action Samples were collected on January 1st and 2nd. Private drinking water well results were provided to property owner(s) in a letter from Shannon and Wilson. Details of the sampling event can be found in the 2020 Tech Memo in the documents section of the database. Erin Gleason
3/10/2021 Update or Other Action Map of groundwater plume made in ADEC GIS mapper. Erin Gleason
4/13/2021 Update or Other Action Meeting held with ADEC and S&W on this date to discuss summer 2021 sampling. Two drinking water well samples will be collected, 2 Bougainvillea way and 49 Same Old Road. Three monitoring well samples, MW10, MW13, and MW15. Erin Gleason
1/6/2022 Update or Other Action Samples were collected on June 23, 2021. Details of the sampling event can be found in the 2021 Technical Memo in the documents section of the database Sarah Mutter
2/9/2023 Document, Report, or Work plan Review - other DEC has received and reviewed the Final Summary Report for per- and polyfluoroalkyl substances (PFAS) monitoring at 77 Same Old Road in Gustavus, Alaska. This report documents the results of sampling conducted in 2020-2022. DEC provided comments on a draft report on January 27, 2023. A final report addressing DEC’s comments was submitted on February 9, 2023, and it is approved. The report includes a recommendation to decommission MW-1 and MW-6. However, it is DEC’s position is that MW-1 and MW-6 should not be decommissioned at this time for the following reasons: MW-1 was installed in 2019 and has been sampled twice. During the 2019 sampling event, MW-1 was only analyzed for perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA). In 2019, there were no detections. MW-1 was sampled again in January 2021 and had detections of perfluorohexanesulfonic acid (PFHxS), perfluoroheptanoic acid (PFHpA), perfluorobutanesulfonic acid (PFBS), and PFOS. Lastly, MW-6 was also installed in 2019 and has been sampled once. In 2019, only PFOS and PFOA were analyzed for and there were no detections. It is unknown whether other PFAS are present in this location, but DEC notes that several of the wells that had no detections for PFOS and PFOA in 2019 had detections of other PFAS during subsequent sampling events. Alyssa Wood
12/18/2023 Document, Report, or Work plan Review - other DEC has reviewed the Final Summary Report for per- and polyfluoroalkyl substances (PFAS) monitoring at 77 Same Old Road in Gustavus, Alaska. This report documents the results of sampling conducted in 2023.The final report has posted in the attachments section. Alyssa Wood
12/26/2024 Site Characterization Workplan Approved DEC has reviewed and approved the "Work Plan, 77 Same Old Road PFAS" for the 77 Same Old Road site. This work plan details the sampling of drinking water wells and groundwater monitoring wells associated with the 77 Same Old Road PFAS groundwater plume. Wells will be sampling from 2025 to 2027, with a different selection of wells being sampled each year. Up to eight groundwater monitoring wells will be chosen for decommissioning in 2025 or 2026, depending on analytical results from the 2025 sampling events. Kelly Walker
11/3/2025 Update or Other Action Draft Report of Gustavus Monitoring of PFAS Concentrations in Groundwater at 77 Same Old Road site has been posted to documents tab. This report details the 2025 sampling of monitoring wells and private drinking water wells to evaluate the extent of the PFAS groundwater plume on the property and migration off property. PFOS and PFOA concentrations above DEC Table C Groundwater Cleanup Levels were detected in multiple wells. Additional results and information are provided in the report. Kelly Walker
11/3/2025 Update or Other Action Draft Report of Gustavus Monitoring of PFAS Concentrations in Groundwater at 77 Same Old Road site has been posted to documents tab. This report details the 2025 sampling of monitoring wells and private drinking water wells to evaluate the extent of the PFAS groundwater plume on the property and migration off property. PFOS and PFOA concentrations above DEC Table C Groundwater Cleanup Levels were detected in multiple wells. Additional results and information are provided in the report. Kelly Walker

Contaminant Information

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