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Site Report: AFSC AIA North Terminal Gate N2


Site Name: AFSC AIA North Terminal Gate N2
Address: Airport North Terminal, Ted Stevens Int'l Airport, Anchorage, AK 99502
File Number: 2100.38.028.13
Hazard ID: 3734
Status: Active
Staff: Wendy Hansen, 9072693059 wendy.hansen@alaska.gov
Latitude: 61.178769
Longitude: -149.984225
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

Hydrocarbon contaminated soil encountered during N2 Gate reconstruction.

Action Information

Action Date Action Description DEC Staff
11/18/2004 Site Added to Database DRO and RRO. Sarah Cunningham
11/18/2004 Update or Other Action Requested ASIG conduct a release investigation. Todd Blessing
7/28/2005 Site Ranked Using the AHRM Preliminary ranking. No Longer Assigned
11/17/2005 Update or Other Action Reviewed N2 Gate release investigation report. Soil and groundwater samples were collected and analyzed for petroleum constituents during the installation of three monitor wells. The soil analytical data suggest that jet fuel constituents are present at levels that exceed Department cleanup levels from the ground surface to the groundwater table, which is located at four to six feet below the ground surface. No fuel product was discovered floating on groundwater within the three monitor wells. The levels of petroleum constituents in groundwater collected from two monitor wells exceed Departmental cleanup levels for petroleum constituents. Todd Blessing
9/1/2006 Update or Other Action A site characterization work plan, which was received by the Department on August 28, 2006 was reviewed. Within the work plan, Ecology and Environment, Inc. (E & E) proposes to advance three soil borings with two completed as monitor wells. Up to three soil samples will be collected from each soil boring to be analyzed for petroleum constituents. Following the monitor well installation, groundwater samples will be collected from each monitor well that does not contain floating petroleum phase product. Investigative derived will be containerized in 55 gallon drums and removed from the site. At this time, the Department approves of the work plan as proposed by E & E provided that E & E fills out the Department’s laboratory data review checklist following receipt of the analytical data. Todd Blessing
2/13/2007 Exposure Tracking Model Ranking Initial ranking Todd Blessing
3/22/2007 Update or Other Action Evaluated site characterization report. Four monitoring wells were installed during the investigation. Soil and groundwater samples were collected during the well installation phase. All four wells that were sampled exhibited elevated levels of diesel constituents in groundwater and one monitor well was not sampled since fuel phase product was observed floating on groundwater. In addition, significant shallow soil contamination was found in one soil boring (N2-AFSC-2). Todd Blessing
3/23/2007 Update or Other Action Issued letter to ASIG requesting that they facilitate the submital of a long term groundwater monitoring plan to the Department. 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
7/23/2007 Update or Other Action Work plan prepared by Shannon and Wilson to sample groundwater from the five existing monitor wells was approved. Groundwater samples will be analyzed for GRO, DRO, and BTEX. Todd Blessing
1/30/2008 Update or Other Action DEC staff reviewed a report titled “Groundwater Sampling and Product Evaluation Gates N2/N4 AIA International Terminal, Anchorage, Alaska.” This report was prepared by Shannon and Wilson Inc., dated December, 2007 and received at DEC's Anchorage office on December 13, 2007. In August 2007, Shannon and Wilson Inc. evaluated the presence of free petroleum product and groundwater conditions at five monitor well locations. Groundwater samples were collected from three of the five monitor wells (i.e. N2-AFSC-3, N2-AFSC-4, and N2-AFSC-5) in which free petroleum product was not observed. The levels of DRO ranged from 0.989 to 34.5 mg/L; GRO and benzene were not detected due to the dilution of groundwater extracts. Petroleum product thickness was measured in monitor well N2-AFSC-2 and determined in August, 2007 to be 4.99 feet. Shannon and Wilson Inc. conducted a free product recovery test subsequent to measuring the thickness of product and found that product recovered to a maximum of 2.4 feet after 0.7 hours. DEC issued a letter on January 30, 2008 requesting AFSC issue a work plan to DEC defining means and methods to evaluate the extent of the DRO plume as well as recover free product over time. Todd Blessing
2/26/2008 Update or Other Action DEC issued a letter to Amber Deem requesting that she construct a report by April 25, 2008 that contains the following information: 1. Results of hydrostatic testing on all fuel lines at North Terminal the last five years. ADEC is interested in the segment of line tested, the time frame of testing, and the pressures exerted. 2. Results of the most recent cathodic protection survey of the hydrant system pipes. 3. Recovery rates and thickness of free product in all monitor wells near the N gates in the last five years. 4. Conceptual site model of soil lithology, groundwater depth, flow, and concentrations of contaminants over time, free product depth and extent, utility and fuel lines, storm drains and catch basins. 5. Liquid chromatograms or fingerprinting of fuel in storm drains, monitor wells, or storm drain outfalls, if available. ADEC is interested in identifying the source of fuel. 6. Estimates of free product recovery in storm drain outfalls. 7. Time frames for hardstand construction at north gates N2, N4, and N6 and pertinent design information on those gates (i.e. design configurations of the storm drains, where air start lines left or removed, and depths of excavation). Todd Blessing
4/15/2008 Update or Other Action DEC has extended the April 25, 2008 deadline for submital of a report that discusses fuel product at ANC's North Terminal. The new deadline is May 2, 2008. Todd Blessing
5/8/2013 Site Characterization Report Approved Reviewed ASIG's North Terminal Fuel Recovery 2012 Summary report. 81.68 gallons of fuel were recovered in 2012 from the wells on the north side wells of the North Terminal; no fuel was recovered from the south site wells associated with the Gate N2 site. Wells with were bailed include DM1 through DM5, DM8, DM9, and AIT-02. Hard copy of the report is filed in 2100.38.028.12 Jacob Gano
2/24/2015 Meeting or Teleconference Held ADEC met with AFSC/ASIG and consultant. ADEC approved of waiver of third party manual recovery requirement. ADEC approved that third party certification of methods is required once a year and since methods are the same, certification of the AFSC Former Bulk Fuel Tank Farm product removal can be used as quality assurance of removal methods at this site. Lisa Krebs-Barsis
2/25/2015 Site Characterization Report Approved Reviewed the North Terminal 2014 Groundwater Monitoring Report. Wells DM-5, DM-9, N2-AFSC-1, N2-AFSC-4, and N2-AFSC 5 had no measurable product and were sampled for diesel range organics (DRO), gasoline range organics(GRO), benzene, toluene, ethylbenzene, and total xylenes. DM-5 and N2-AFSC-1 exceeded groundwater cleanup levels for DRO, GRO and benzene. DM-9 exceeded for benzene and N2-AFSC-5 exceeded for DRO and benzene. Lisa Krebs-Barsis
6/20/2017 Report or Workplan Review - Other Reviewed North Terminal 2016 groundwater monitoring report, dated March 6, 2017. Wells DM-9, N2-AFSC-1, N2-AFSC-4, and N2-AFSC 5 had no measurable product and were sampled for diesel range organics (DRO), gasoline range organics(GRO), benzene, toluene, ethylbenzene, and total xylenes. Well DM-5, sampled during the previous event, was not sampled due to the presence of free product. N2-AFSC-1 exceeded groundwater cleanup levels for DRO, GRO, benzene, ethylbenzene, and xylene. DM-9 and N2-AFSC-5 exceeded for DRO and benzene. Continued annual monitoring was recommended. Wendy Hansen
7/25/2017 Meeting or Teleconference Held DEC Staff met with ASIG and consultant AECOM to discuss status of site and path forward. A letter dated September 22, 2017 documents the meeting and subsequent communications. Free product recovery with biennial oversight by AECOM and annual (typically August) groundwater sampling of wells without product is ongoing for this site, and associated North Terminal, 2100.38.028.12. 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.

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