Gustavus Airport Runway, Apron, and Taxiway Pavement Rehab
Project # Z675170000
The Gustavus airport project is needed to maintain the airport and addresses Federal Aviation Administration (FAA) safety concerns. One concern is that extensive cracking in aging pavement on runways and other paved areas used by aircraft increases the risk of damage to aircraft as the pavement condition worsens. The other main concern is that aircraft use designated taxiways when moving between aircraft parking areas and the runway. The Gustavus airport does not have designated taxiways for the shorter crosswind runway. To address FAA's concerns at the Gustavus airport, the project will:
- Resurface and rehabilitate existing taxiways, aprons, and runways
- Add new taxiways F and G
- Install lighting for new taxiway F
- Expand paved aircraft parking area enough to make up for existing paved areas that will be converted to designated taxiways
- Replace existing aircraft tie downs and install new tie downs in new aircraft parking areas
- Cut grooves for improved traction on new runway pavement
- Pavement striping
In March 2021 Shannon & Wilson, Inc. took two preliminary PFAS samples of asphalt from the apron previously known to be an Aircraft Rescue and Firefighting training area. Approximately a week later the department received those results which indicated further investigation was warranted. Utilizing department records and the Howell Report provided by community members within Gustavus, a sampling map was created. The following week samplers from the Department of Environmental Conservation collected 33 primary asphalt samples, 31 new locations and two samples near the original locations, with four field duplicates for PFAS and five samples submitted for analysis using the Synthetic Precipitation Leaching Procedure (SPLP) analytical method. All of the other samples were submitted utilizing modified Environmental Protection Agency Method 537. At this time there are no regulatory levels set for PFAS in asphalt. Out of abundance of caution the department is currently comparing asphalt sample results to the most stringent DEC cleanup level for the migration to groundwater pathway. You can download the regulations here under 18 AAC 75.341, table B2. As the department learns more about PFAS as it relates to asphalt, DOT&PF will continue to work closely with Alaska DEC to determine if these levels are the most appropriate levels to compare to.
The SPLP method is a single point leachate test designed to simulate very specific precipitation conditions.
Ongoing Sampling and Testing
DOT&PF ordered five SPLP Leaching Test samples on May 14, 2021, and results are expected the week of June 14, 2021. The five samples are GST-017-AS through GST-021-AS, taken from runway 11-29. The purpose of these tests is to provide additional guidance for project material reuse.
Three concrete hardstand samples were sent to the lab the week of May 24 and will be tested using the Toxicity Characteristic Leaching Procedure (TCLP) to determine the concrete hardstand solid waste disposal method. The hardstands will be covered while in interim storage in an already contaminated area. Results are expected the week of June 28, 2021.
Four samples from Stockpile #1, generated from green zones within the general aviation apron and runway 2-20, were gathered using Incremental Sampling Methodology (ISM) to confirm project stockpiling procedures to date. The samples were sent to the lab the week of May 24, and results are expected the week of June 28, 2021.
DOT&PF will continue to post information publicly at this website and additional information on the PFAS response can be found at the Alaska DEC Contaminated Sites website.
Project Timeline & Documents
- 08/12/2021: Contaminated Materials Management Plan (CMMP), submitted on August 11, DEC approved.
- As part of the larger site characterization effort, the Department of Transportation and Public Facilities (DOT&PF), State of Alaska, proposes to conduct site characterization of the PFAS plume at the Gustavus airport. See the Gustavus Airport PFAS Contamination Information page here or a direct link to the information on the public comment period associated with the site characterization here.
- 07/07/2021: CMMP, submitted on June 29, DEC approved.
- 06/28/2021: CATEX Supplemental Information Request by FAA
- 06/25/2021: Gustavus Airport 2 Week Schedule Look Ahead
- 06/24/2021: Weekly Stakeholder Update
- 06/21/2021: Summary of Asphalt SPLP Analytical Results
- 06/21/2021: May 2021 Ashpalt and Concrete Samples (Table 1)
- 06/21/2021: ISM Triplicate Sample Statistical Results (Table 2)
- 06/21/2021: May 2021 Asphalt SPLP Sample Results (Table 3)
- 06/21/2021: ISM Triplicate Sample Statistical Results (Table 4)
- 06/21/2021: May 2021 Concrete TCLP Sample Results (Table 5)
- 06/18/2021: Photo of construction progress. Image courtesy of Mark Morris.
- 05/25/2021: Directive #14 – Site stabilization and material handling clarifications
- 05/21/2021: Asphalt Synthetic Precipitation Leaching Procedure (SPLP) Analytical Results
- 05/20/2021: Interim Work Authorization 15 – Allowed for virgin aggregate to be placed over PFAS contaminated areas and eliminate material blending creating a barrier between the contaminated area and the work surface
- 05/18/2021: Gustavus Airport Stockpile Sampling and Analysis Plan
- 05/15/2021: Directive #12 – Support erosion control efforts
- 05/15/2021: Directive #11 – Support erosion control efforts
- 05/10/2021: Special meeting with Community of Gustavus
- 05/09/2021: Directive #4R, Incorporate RAP into HMA Mix Design, Amends Directive 4 part C
- 05/07/2021: FAA Letter requesting DOT&PF to submit an updated CATEX request for current reevaluation of NEPA
- 05/06/2021: Directive #10 – Asphalt Debris at General Aviation Apron
- 05/05/2021: Directive #9 – Alternate Phasing for Embankment
- 05/03/2021: Directive #8 – Clarifies the Contractor shall follow GCP 70-11(h) regarding solid waste and P151-2.1 regarding burning operations
- 05/03/2021: Interim Work Authorization 12 – Authorizes time and materials compensation to comply with the CMMP
- 04/28/2021: CMMP, DEC approved. This plan that builds upon the original soil management plan to incorporate asphalt findings and handling procedures
- 04/28/2021: Alaska Dept. of Fish and Game Fish Habitat Permits
- 04/27/2021: Directive #7 – Stockpiling clarification to Interim Work Authorization IWA #11 including the stockpiling of concrete hardstands
- 04/22/2021: DNR Temporary Water Use Authorization and supporting documents
- 04/21/2021: Interim Work Authorization 11 – Haul and stockpile RAP per Asphalt Material Handling Map
- 04/21/2021: Request for Proposal 10 – Proposal request associated with Interim Work Authorization 11 “haul and stockpile RAP per Asphalt Material Handling Map”
- 04/20/2021: Finalization of Gustavus Airport Asphalt Material Handling Map
- 04/19/2021: Third batch asphalt testing data received from April 4 asphalt sampling plan
- 04/17/2021: DNR water use permit application finalized to use only PFAS non-detect water sources. DOT&PF coordinated with DEC to select sources
- 04/15/2021: Second set of asphalt test results received from April 4 asphalt sampling plan
- 04/14/2021: Interim Work Authorization #9 (mislabeled as #7) – Deliver new, uncontaminated material from the dock to the staging area for use protecting the community well site
- 04/08/2021: Interim Work Authorization #7 – Deliver new, uncontaminated material to Gustavus dock, intended to be used at staging area to protect the community well site
- 04/07/2021: Response email to Gustavus PFAS Action Coalition
- 04/06/2021: Asphalt samples sent to Sacramento lab
- 04/05/2021: Interim Work Authorization #6 – Support drilling for asphalt sampling plan
- 04/05/2021: Request for Proposal #8 – Follow up to Interim Work Authorization #5
- 04/05/2021: Interim Work Authorization #5 – Intended to establish contained PFAS liner facility
- 04/04/2021: Directive #5 – Intended to establish additional protective measures to prevent PFAS contamination during planned asphalt grinding operations
- 04/04/2021: Asphalt sampling plan map completed in consultation with DEC
- 04/04/2021: Verbal approval to contractor for additional protective measures to prevent PFAS contamination
- 04/03/2021: Based on initial asphalt test results, DOT&PF coordinated with DEC on methods to handle contaminated asphalt and assumed all asphalt to be positive until test results show otherwise
- 04/03/2021: Request for Proposal #7, Follow up to Interim Work Authorization # 4
- 04/03/2021: Interim Work Authorization #4 – Soil Management Plan incorporated in contract
- 04/02/2021: First two test results for General Aviation Apron asphalt samples
- 03/23/2021: Request for Proposal # 5, Follow up to Directive #4
- 03/17/2021: Directive #4 – Intended to protect staging area from PFAS contamination
- 10/06/2020: Notice to Proceed
- 09/11/2020: Letter of Award
- 05/29/2020: Project Advertised - ALASKA: Proposal Z675170000 (bidx.com)
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Alaska PFAS Information
Gustavus Airport Firefighting Testing Area Contamination
Alaska DEC Site Report: Gustavus Aiport Sitewide PFAS
Drinking Water Sample Results (Alaska DEC)
Alaska DEC PFAS