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Site Report: AFSC AIA B-Concourse


Site Name: AFSC AIA B-Concourse
Address: Ted Stevens Int'l Airport, Anchorage, AK 99502
File Number: 2100.38.028.09
Hazard ID: 1780
Status: Active
Staff: Wendy Hansen, 9072693059 wendy.hansen@alaska.gov
Latitude: 61.173172
Longitude: -149.981872
Horizontal Datum:

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

Diesel contaminated soils; widespread contamination caused by releases primarily from underground fuel pipelines and vaults; minor groundwater contamination detected at approximate depth of 70 feet.

Action Information

Action Date Action Description DEC Staff
12/22/1999 Site Added to Database Diesel. Eileen Olson
1/24/2000 Site Ranked Using the AHRM Initial ranking. Eileen Olson
5/9/2000 Site Ranked Using the AHRM Changed GW Usage Value to 0.8 from 0.4 and changed GW Exposure Index Value from 0.4 to 1 as monitoring wells are contaminated. Eileen Olson
4/12/2004 Update or Other Action Approved of Plan to reuse contaminated soils for the South Terminal, North Taxi Lane Reconstruction Project located roughly 100 feet north of concourse B Todd Blessing
4/19/2004 Update or Other Action File number assigned: 2100.38.028.09. Sarah Cunningham
4/14/2006 Update or Other Action Approved of ANC's plan to re-use contaminated soils uncovered during the hydrant pit relocation project. Any soil uncovered that is greater than 12,500 mg/Kg will be thermally treated off-site. All areas of excavation will be field screened and sampled. Sampling will consist of collecting soil from one bottom and one side wall in each excavation as well as field screen samples. Todd Blessing
3/5/2007 Exposure Tracking Model Ranking Baseline ranking Todd Blessing
7/3/2007 Institutional Control Record Established In accordance with 18 AAC 75.350, ADEC has determined that the unconfined groundwater (above the Bootlegger Cove Formation) at the Anchorage International Airport (AIA) is not a current or future drinking water source. This determination is subject to the following conditions: 1. It applies only within the Airside and Commercial RMZ’s, as described in the Airport-Wide Remediation Management Plan. It does not apply within the Ecological RMZ. 2. It does not establish alternative cleanup levels within those zones but allows ADEC to use the determination in making decisions in accordance with 18 AAC 75.345(b)(2) - (3). 3. Any drinking water wells located on AIA property must be properly abandoned in accordance with ADEC decommissioning procedures within two years of this decision. 4. AIA shall prohibit the installation of any water wells, used for drinking, cooling, washdown, or any other purposes, on the AIA either through 17 AAC 42.410 (b) (27) of the airport leasing regulations or in their individual lease agreement documents. 5. The existing AIA water well used to maintain the water level in Lake Hood is not considered a drinking water well. However, AIA is responsible for determining its wellhead protection area and ensuring that it maintains levels at or below 18 AAC 75.345 Table C values, unless otherwise approved by ADEC. March 19, 2007 Amendment: DEC has determined that the shallow groundwater along the Lake Hood shoreline is not a current or future drinking water source in accordance with 18 AAC 75.350. Therefore, the March 2001 groundwater use determination is amended to include the shallow groundwater in the Ecological RMZ in that determination. Todd Blessing
12/26/2007 Update or Other Action Contaminated soil was discovered on the southeast section of the concourse during the Concourse A/B remodel. Todd Blessing
1/9/2008 Update or Other Action DEC staff reviewed a work plan to handle contaminated soils during the South Terminal Retrofit Phase 2 construction project. The work plan was prepared by Environmental Management, Inc., dated December 26, 2007 and received at this office on December 27, 2007. Within the work plan, EMI Inc. proposed to do the following: Identify potentially contaminated soil during excavation activities; stockpile potentially contaminated soil for evaluation; classify soils according to “Clean”, “Warm”, and “Hot” designations; segregate and stockpile Warm soil for future analysis; complete laboratory data review checklists for each analytical work order performed by the analytical laboratory; and issue a final report. DEC staff approved the work plan provided: Soil regardless of classification will not be transported outside the airside remediation management zone and EMI will issue a final report to CSP within 60 days of completion of field work. Todd Blessing
10/19/2010 Conceptual Site Model Submitted In response to the 8/26/08 request for a conceptual site model (CSM) by ADEC, ASIG/AFSC's consultant, Shannon & Wilson, completed and submitted an environmental document review and CSM dated October 14, 2010. The CSM identified potential for incidental soil ingestion pathway by construction workers if the soil is disturbed. Also the outdoor air pathway could be possible because contamination exists within 15 bgs, if the asphalt/concrete were removed. All other pathways are considered incomplete. Darren Mulkey
9/25/2013 Site Visit ADEC staff conducted a site visit to observe the current land use and become familiar with the site. Meghan Dooley
2/3/2015 Update or Other Action Reviewed engineering plans for proposed 2016 B Concourse upgrades. Lisa Krebs-Barsis
5/8/2015 Meeting or Teleconference Held Site visit to the B concourse site. Lisa Krebs-Barsis
5/24/2016 Report or Workplan Review - Other AIA is conducting a project to investigate the insulation buried under the ramp around Concourse B. They plan to hydro-vac three 18-inch holes to a depth of five feet bgs to access the insulation. If any contaminated soils are incidentally encountered during the investigation, they will be collected in 55-gallon drums and sampled for GRO, DRO & BTEX. Based on sample results the soils will be landfarmed onsite or thermally remediated offsite. The plan was approved and the emails saved in the CSP database. Darren Mulkey
7/25/2017 Meeting or Teleconference Held DEC Staff met with ASIG and consultant AECOM to discuss status of site. A letter dated September 22, 2017 documents the meeting and subsequent communications. No active remediation or monitoring activities are currently occurring at this site. B-concourse related infrastructure improvement projects are managed with regard to the potential to encounter contaminated soils. Wendy Hansen

Contaminant Information

Name Level Description Media Comments
DRO Other SoilGroundwater
GRO Other SoilGroundwater
BTEX Other SoilGroundwater

Control Type

Type Details
Other Commercial and Airside Remediation Management Zones as well as the Lake Hood shoreline are not a present or future drinking water source.

Requirements

Description Details
Groundwater Use Restrictions Any drinking water wells located on AIA property must be properly abandoned in accordance with ADEC decommissioning procedures within two years of this decision. AIA shall prohibit the installation of any water wells, used for drinking, cooling, washdown, or any other purposes, on the AIA either through 17 AAC 42.410 (b) (27) of the airport leasing regulations or in their individual lease agreement documents.

Missing Location Data

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