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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: Erin Gleason, 9074512056 erin.gleason@alaska.gov
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.

Problems/Comments

The Alaska Department of Transportation and Public Facilities (ADOT&PF) detected perfluoro octanesulfonic acid (PFOS) and Perfluorooctanoic acid (PFOA) in drinking water at two public water system near the airport in Gustavus in July 2018. Concentrations of PFOS+PFOA exceeded the EPA's lifetime health advisory (LHA) level 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. The nature and extent of the PFOS and PFOA contamination is still being determined. Quarterly groundwater and drinking water samples are collected by the ADOT. All homes that have drinking water above the EPA LHA are being provided alternate drinking water by the ADOT. ADOT is working with Department of Administration (DOA) risk management division to install a permanent long term drinking water solution in Gustavus. In 2020, DOA sampled three potential well locations north of the airport on State of Alaska property as potential locations for a public drinking water well. DOA proposes trucking water to impacted homes from the public well. For more information visit the ADOT&PF Gustavus webpage: http://dot.alaska.gov/sereg/GST-AIP_PFA/index.shtml

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 www.alaska.gov/go/C732. 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: http://dot.alaska.gov/sereg/GST-AIP_PFA/index.shtml 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. http://dot.alaska.gov/sereg/GST-AIP_PFA/index.shtml 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
3/28/2019 Update or Other Action Rec'd the March 2019 sampling results. The results (PFAS 6 compounds) for 26 samples (including private drinking water wells) were reported. There are no new exceedances but there were large decreases for 3 wells and 1 well had a large increase. Several scheduled locations were not sampled due to refusal by owner or winterized properties. The maximum sum of 5 PFAS concentration reported was 6,900 nanograms per liter (ppt). 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
5/6/2019 Site Characterization Report Approved Approved the Summary Report August 2018 to November 2018 Private Well Sampling Gustavus, Alaska this date. A total of 120 private wells were identified and 101 of these were sampled for PFAS at TestAmerica using their method WS-LC-0025 reporting six PFAS: PFOS, PFOA, PFHpA, PFNA, PFBS, and PFHxS. Of these, 18 exceeded the action level. The drinking water wells PFAS contamination is dominated by PFOS having concentrations up to 5,500 µg/L. PFHxS is the second highest contributor to the contamination having a maximum detected concentration of 1,900 µg/L. Alternative drinking water was provided to those well owners who had sum of five PFAS results above the action level. Five surface water samples were collected from various locations including sloughs, excavations, and drainage ditches and analyzed for PFAS. The results found PFAS above the action level on the east and southwest ends of the runway. The surface water contamination was also dominated by PFOS and PFHxS. According to the report, the ADOT&PF is exploring various long-term options including, but not limited to POE systems. Planned future work includes continuing the well search as needed, quarterly sampling in March 2019 and quarterly though 2019 (according to the proposed and approved well monitoring network), and the preparation of a site characterization work plan for the airport. Danielle Duncan
6/3/2019 Update or Other Action Per the DOT: Residential monitoring: Shannon & Wilson and DOT&PF are working to get one work plan created for all the airports and issue addendums to add airports impacted by PFAS as they are identified. The long-term monitoring plans will be part of this. We have not identified a funding source for this work yet. Seeing how it’s the end of the fiscal year this will most likely take place after July 1. S&W will send the quarterly monitoring information once she has it finalized. The contract was and funding source was just finalized late Friday afternoon for this work. Site characterization: The work plan has been drafted I should receive a copy for review soon. Filtration Systems: S&W said that the Gustavus Inn filtration system is installed and follow up testing will take place toward the end of the week or beginning of next week. There are no other updates to date regarding any of the other filtration systems. Also, per the DOT, doing the following work in the near future: Collecting pre- and post-treatment samples from the newly installed Gustavus Inn POET system. This is the first of the quarterly set of samples. They will be quarterly for the first year in order to conduct a full-scale pilot study on the system. Collecting a few garden soil samples from the Gustavus Inn. This is not part of site characterization activities and is being sampled as part of the claims process. Quarterly sampling of from Category 1 and 2 private wells (indoor plumbing) with a sum of PFOS/PFOA concentration greater than 35 ppt (sampling criteria). In the absence of monitoring criteria from ADEC (the updated Tech memo did not address this), we used the previously-proposed criteria, but switched out sum of 5 for sum of PFOS/PFOA. Additionally, nearby wells within 500 feet of a well meeting the sampling criteria will also be sampled. There are 30 wells that fit into these categories. Also part of this is sampling is two newly-installed wells in Gustavus. Both are in an area where it is likely their results will be greater than the action levels. One is the new Gustavus Community Center being built across the street from the Gustavus Inn. Danielle Duncan
6/24/2019 Report or Workplan Review - Other Reviewed and provided comments on the June 2019 Site Characterization Work Plan, however, the work plan is likely going out for public comment and as a result, there may be modifications to the work plan that will require reviewing. Danielle Duncan
7/3/2019 Update or Other Action The Gustavus Inn has been outfitted with a point-of-entry system and as a result, the DOT and DOA are no longer providing alternative drinking water and the ADEC has concurred. Danielle Duncan
7/13/2019 Update or Other Action Quarterly residential groundwater monitoring was completed for PFOS and PFOA only per the revised PFAS memo. Per S&W, "there are six locations that no longer appear to be exceedances based on the changes in the sampling guidelines. We are adding disclaimers to their results notification letters to notify them that they will still be eligible for a long-term solution based on their previous results. These locations will also continue to receive temporary alternative water." Danielle Duncan
8/5/2019 Site Characterization Workplan Approved Approved the Work Plan – Revision 1, Gustavus Airport PFAS Site Characterization this date. Soil, groundwater, surface soil, and sediment samples will be collected from various sites on and off airport property and analyzed for PFOS and PFOA. The work plan is available in the attachments section. Danielle Duncan
8/5/2019 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
10/11/2019 Update or Other Action The fourth quarter 2019 groundwater monitoring samples and private drinking water well samples were collected on this date. In addition, soil, sediment, and surface water samples were collected. Erin Gleason
11/1/2019 Update or Other Action Sediment samples were collected from Glen's ditch. PFAS detected. Erin Gleason
12/13/2019 Update or Other Action Reviewed data from November, 2019 private well sampling effort. Results are consistent with previous sampling efforts: one new property was identified where PFOS+PFOA exceeds the Lifetime Health Advisory, however that property is not continuously occupied. The owner has been notified and will contact ADOT when they return to Gustavus. Bill O'Connell
12/27/2019 Update or Other Action Discussions are ongoing between DEC, DOT, and Risk Management on a permanent alternative water solution for Gustavus. Bill O'Connell
3/1/2020 Update or Other Action First quarter groundwater monitoring samples and private well samples were not taken due to the covid 19 pandemic. This is a deviation from the work plan. Ordinarily, private wells and groundwater monitoring wells would be sampled once per quarter. Erin Gleason
3/3/2020 Meeting or Teleconference Held Monthly Update teleconference held on this day. Characterization report is still being draft and we anticipate it will be submitted to ADEC sometime in March 2020. Erin Gleason
3/20/2020 Update or Other Action Received 2019 report from ADOT on March 13th, 2020. Interested members of the public may access the report from the "documents tab" of the ADEC website. The report includes results from the summer 2019 sampling of groundwater, surface soil, subsurface soil, and ditch sediments at and around the Gustavus airport. Fifteen groundwater wells were installed at depths of 15-46 feet along with 8 temporary wells. Groundwater concentrations of PFOS+PFOA are between no detectable amount and 188 parts per trillion (ppt). Ten surface water samples were collected from around the airport in the adjacent ditches. Surface water concentrations of PFOS+PFOA are between no detectable amount and 379 ppt. Forty one surface soil samples, nine subsurface soil samples, and nine sediment samples were collected. Concentration of PFOS and PFOA were between non-detect and 520 micrograms per kilogram. Figure 2 and figure 3 of the report illustrate the location of contaminants. ADEC has reviewed the report and requests revisions. Erin Gleason
4/10/2020 Site Characterization Report Approved ADEC received the revised report on 4/9/2020 and it is now approved. Erin Gleason
6/1/2020 Update or Other Action Second quarter groundwater monitoring samples and private well samples were not taken due to the covid 19 pandemic. This is a deviation from the work plan. Ordinarily, private wells and groundwater monitoring wells would be sampled once per quarter. Erin Gleason
6/12/2020 Report or Workplan Review - Other ADEC has received a State wide work plan to survey PFAS at impacted airport, including Gustavus. ADEC is in the process of reviewing this work plan and will provide comment to ADOT. It is anticipated that each individual airport will have a supplemental plan to account of nuances at their location. Erin Gleason
6/16/2020 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, HSS, and DOA. Erin Gleason
7/15/2020 Report or Workplan Review - Other ADEC has reviewed the Statewide work plan and requests revisions. Comments provided to ADOT in form of comment matrix. Erin Gleason
7/21/2020 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, HSS, and DOA. Erin Gleason
8/10/2020 Site Characterization Workplan Approved ADEC receives revised statewide general PFAS work plan from ADOT on 8/3/2020. ADEC has reviewed the work plan and it is now approved. Erin Gleason
8/20/2020 Site Characterization Report Approved ADEC received the November 2018 to December 2019 Drinking Water Sampling Report from Shannon and Wilson on behalf of ADOT &PF on August 10th, 2020. ADEC has reviewed the report and it is now approved. Erin Gleason
8/21/2020 Report or Workplan Review - Other ADEC received the site specific work plan addendum for Gustavus airport PFAS on August 13th, 2020. This addendum is specific to Gustavus and is an addendum to the Statewide ADOT PFAS work plan (dated August 3rd, 2020). ADEC has reviewed the addendum and requests revisions. Letter sent to ADOT on this date. Erin Gleason
8/25/2020 Update or Other Action ADEC received revised work plan addendum and response to comments on 8/24/2020 from Shannon and Wilson Inc. ADEC has reviewed the revised work plan addendum and it is now approved pending one addition. In accordance with ADEC FSG (10/2019) ADEC, the full suite of VOC must be analyzed. Letter of approval sent to ADOT on this date. Erin Gleason
9/1/2020 Update or Other Action The third quarter 2020 groundwater monitoring samples and private drinking water well samples were collected on this date. Erin Gleason
9/14/2020 Update or Other Action Received preliminary private drinking water well data from Shannon and Wilson for the annual sampling event. Any well that was previously above the 17.5ppt threshold or within 500 feet of an effected well was sampled. Data is currently under review. Erin Gleason
9/15/2020 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, HSS, and DOA. Erin Gleason
9/18/2020 Update or Other Action Receive September 2020 drinking water results for the Gustavus Inn. PFAS is non-detect at the faucet indicating that the POET (point of entry treatment) system is working. (The POET is regulated by the ADEC drinking water program and the work is funded by DOA.) Erin Gleason
10/14/2020 Update or Other Action Results from the September 2020 third quarter monitoring event have the sum of PFOS and PFOA above ADEC cleanup levels in MW2-20, which is located on city hall property west of the salmon river. This data is an anomoly because MW2-20 has not exceeded previously and at this sampling event it was two orders of magnitude higher than the previous quarter. Of note, MW2-30 the adjacent and deeper well is non-detection PFOA+PFOA. ADOT will sample the well again in December 2020. ADEC will contract a third party to sample the three drinking water wells nearest MW2-20 to insure no drinking water is impacted. Erin Gleason
11/23/2020 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, HSS, and DOA. Erin Gleason
12/8/2020 Meeting or Teleconference Held Discuss of flooding in Gustavus with ADEC drinking water program, ADOT, and ADEC disaster coordinator. Drinking water program recommends that if private drinking water wells have been inundated with flood water they should boil water for 2 minutes because of concerns of septic inundation. Erin Gleason
12/9/2020 Meeting or Teleconference Held ADEC received complaint from public that PFAS water from the airport may be impact private drinking water wells during the flood. ADEC management met with the disaster team in Gustavus and ADOT. It was determined that areas with flooding down gradient of the PFAS contaminated duck pond were already receiving bottled water. Concern was expressed by the public about Harry Hall Road. To date, ADEC is not aware of PFAS water moving into that area. Jeff Jarvis from ADOT in Gustavus reports that flooding on Harry Hall Road is coming from the northern gravel pits. Shannon and Wilson is scheduled to sample in December as part of the 4th quarter monitoring event. They will sample to additional wells in the flood area at the four corners to determine if PFAS has impacted those wells. Erin Gleason
12/10/2020 Meeting or Teleconference Held Meeting with ADEC and ADOT to discuss the Gustavus Pavement Rehab project. ADOT will provide ADEC a map of areas to be repaved for review. Depending on the work planned for the paving, soil management may or may not been required. Erin Gleason
12/10/2020 Update or Other Action FAA will drill one hole adjacent to the Alaska Airlines building at the Gustavus Airport for a antennae. They will put the soil back into the hole after the work is complete. The hole will be patched with asphalt. The work is schedule for January 2021. Erin Gleason
12/14/2020 Meeting or Teleconference Held ADEC and ADOT held a meeting on this date to discuss the delayed maintenance on the ditches surrounding the Gustavus airport. It was determined that repair could be done on the ditches in areas outside of PFAS contaminated zones. The section of ditches within the PFAS contaminated zones will need soil management plans and sampling. These will occur at a later date. Erin Gleason
12/23/2020 Meeting or Teleconference Held ADEC and ADOT held a follow up meeting today to discus the Gustavus Airport Rehab project. One area of the proposed project, adjacent to taxiway C, requires excavation of soil and the construction of a new ditch. This area is near MW11-15 and is the location of the former fire training area. The area has PFAS contamination in the surface soil. Soil will need to be sampled and disposed of off site. ADOT and ADEC have met on this date to discuss options for soil removal, disposal, and sampling. The project will have a Storm Water Pollution Prevention Plan (SWPPP) with ADEC Division of Water. The project is currently using the north portion of the airport for contractor staging, but may relocate. The waste asphalt that is removed during the project will be disposed of on the east side of the airport near MW12. Erin Gleason
12/24/2020 Update or Other Action Environmental Compliance Consultants sampled the three drinking water wells near MW2-20 the second week of December. Results will arrive in 2-3 weeks. This sampling event was paid for by ADEC and was a result of the high concentration of PFAS found at MW2-20 in September 2020. Erin Gleason
12/31/2020 Update or Other Action The fourth quarter 2020 groundwater monitoring samples and private drinking water well samples were collected on this date. Erin Gleason
1/11/2021 Update or Other Action In addition to the regularly scheduled fourth quarter sampling, two additional private wells were added to the sampling event to determine if new areas were impacted by December 2020 flooding. Results were received for groundwater monitoring wells the week of January 10th. Concentration of PFOS+PFOA at MW11 near the "new AFFF training area" has increased from 76 ppt in September 2020 to 6,192 ppt in December 2020. This data indicates that flood waters mobilized the PFAS from the soil and into groundwater in this area. Concentration of PFOS+PFOA at MW12 in the "old AFFF training area" has decreased from 210 ppt in September 2020 to 110ppt in December 2020. The concentration of PFOS+PFOA at MW9 stayed constant between September and December 2020. The concentration at MW10 decreased from September to December 2020. All other monitoring wells are below the EPA LHA. Erin Gleason
1/11/2021 Meeting or Teleconference Held Meeting with ADOT, ADEC, and Shannon and Wilson to discuss the 2020 4th quarter monitoring well sample results. Erin Gleason
1/11/2021 Update or Other Action Results are back from ECC for the sampling around MW2 at City Hall. PFAS were not detected above the lifetime health advisory level for PFOS + PFOA of 70 parts per trillion (ppt) in any of the wells, The well at on Shooting Star Lane has PFOS at 32 ppt. Erin Gleason
1/11/2021 Update or Other Action The fourth quarter 2020 groundwater samples were collected in December 2020. Of note, MW2-20 has PFOS + PFOA at 317 ppt. This concentration is similar to the third quarter sampling event in September 2020. This data indicates that PFAS is present in MW2 and in the vicinity. Erin Gleason
1/12/2021 Update or Other Action ADEC and ADOT held a follow up meeting today to discus the Gustavus Airport Rehab project. ADOT is finalizing plans for volume of contaminated soil to be removed and how it will be disposed of. Erin Gleason
1/20/2021 Meeting or Teleconference Held Meeting with ADEC CSP and ADEC drinking water program to discuss the effects of flooding on National Park Service public water system. Erin Gleason
1/21/2021 Report or Workplan Review - Other Received soil management plan for gate replacement at airport on 12/17/21. ADEC has reviewed the plan and is requesting revisions. Letter sent to ADOT on this date. Erin Gleason
1/22/2021 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, HSS, and DOA. Erin Gleason
1/26/2021 Meeting or Teleconference Held ADEC and ADOT held a follow up meeting today to discus the Gustavus Airport Rehab project. ADOT is finalizing plans for volume of contaminated soil to be removed and how it will be disposed of.ADOT environmental will write a contaminated soil management plan and submit to ADEC for review and approval. Erin Gleason
1/27/2021 Site Characterization Workplan Approved ADEC received the final draft gate replacement work plan from ADOT. All requested changes were made and it is now approved. Erin Gleason
2/3/2021 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 80270 ADOT&PF Gustavus Airport Sitewide PFAS. Erin Gleason
2/11/2021 Update or Other Action ADEC received draft soil management plan for airport reconstruction soil management. ADEC will review and provide comments. The airport reconstruction project involved removal and replacement of asphalt. The project will involve the construction of a new taxi way near MW11. This work does require the removal of about 200 cubic yards of PFAS contaminated soil. The soil management plan details how the soil will be removed and where it will be stored. Erin Gleason
2/25/2021 Meeting or Teleconference Held Meeting with ADOT, ADEC, and Shannon and Wilson to discuss the fourth quarter 2020 results and the upcoming March 2021 (first quarter) sampling. Erin Gleason
2/26/2021 Update or Other Action ADEC has reviewed the draft soil management plan from ADOT for airport rehab project and provided comments. Erin Gleason
3/5/2021 Update or Other Action Received revised soil management plan from ADOT environmental on 3/3/21. ADEC has review the plan and requests some revisions. Letter sent to ADOT environmental on this date. Erin Gleason
3/10/2021 Update or Other Action Map of groundwater plume made in ADEC GIS mapper. Erin Gleason
3/10/2021 Update or Other Action ADEC has reviewed the Soil Management Plan for the runway reconstruction and has no further comments. Erin Gleason
3/17/2021 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, HSS, and DOA. Erin Gleason
3/31/2021 Meeting or Teleconference Held Preliminary meeting with ADEC and ADOT held on this date to discuss what sampling and measure would need to be taken for repair of PFAS contaminated ditches at the airport. Erin Gleason
4/1/2021 Update or Other Action First quarter groundwater monitoring and private well sampling was conducted March 22-26, 2021. Data indicates that groundwater concentrations have decreased since December 2020 sampling. Erin Gleason
4/26/2021 Update or Other Action ADEC received the updated Materials Management Plan from ADOT. The plan is for the management of PFAS containing asphalt and soil that is a part of the Gustavus airport rehab project. ADEC will review the plan and provide comment to ADOT Erin Gleason
4/28/2021 Meeting or Teleconference Held Meeting held today with ADEC and ADOT to discussion ADEC comments on the Materials Management Plan for the airport rehab project. Erin Gleason
5/19/2021 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, HSS, and DOA. Erin Gleason
8/6/2021 Report or Workplan Review - Other ADEC received a draft work plan addendum from Shannon and Wilson on behalf of ADOT on June 29th, 2021. ADEC has reviewed the work plan addendum and made comments. Erin Gleason
8/17/2021 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, DHSS, and DOA. Erin Gleason
9/21/2021 Meeting or Teleconference Held Monthly meeting with ADOT, ADEC, Shannon and Wilson, DHSS, and DOA. Erin Gleason
9/22/2021 Site Characterization Workplan Approved ADEC received the revised work plan addendum from Shannon and Wilson on behalf of ADOT on 9/8/21. ADEC has reviewed the work plan addendum and it is now approved. The work plan addendum includes soil sampling, groundwater sampling, installation of new groundwater monitoring wells across the site, and sampling of the ditches around the airport. Erin Gleason

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