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Site Report: AFSC AIA Former Fuel Vault

Site Name: AFSC AIA Former Fuel Vault
Address: 6050 Rockwell Avenue, at Postmark Drive, Anchorage, AK 99502
File Number: 2100.38.028.16
Hazard ID: 2009
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229
Latitude: 61.188317
Longitude: -149.997239
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.


On February 14, 1994 Aircraft Service International Group responded to a 65,340-gallon fuel spill originating from a hydrant system valve box at Federal Express on the Anchorage International Airport tarmac. The spill emanated from a broken flange on a 16 foot valve. The fuel flowed along approximately 1,500 lineal feet of a drainage ditch located adjacent to the valve box.

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
3/16/2000 Update or Other Action Received groundwater monitoring development of ACL document. Eileen Olson
5/9/2000 Update or Other Action Changed site name so it is preceded by ANC. Eileen Olson
5/9/2000 Site Ranked Using the AHRM Changed GW Usage Value from 0.4 to 0.8. Eileen Olson
7/7/2000 Site Ranked Using the AHRM Changed the Population Proximity Value from 0.5 to 1 as there are occupied buildings within 500’. No Longer Assigned
8/9/2000 Site Ranked Using the AHRM Changed Groundwater Exposure Index Value to 1 from 0.4 as groundwater is reportedly contaminated. Eileen Olson
7/6/2001 Site Characterization Workplan Approved Approval of plan to further assess the groundwater contamination. Renee Evans
9/12/2001 Update or Other Action Received report on workplan actions. Additional investigative work planned at site. Awaiting AIA Risk Management Plan results and GW Use Determination. Must then decide if additional free product recovery is needed. Renee Evans
12/21/2004 Update or Other Action Submitted letter addressed to Laurie Butler requesting site characterization plan and free product recovery reports completed from 2002 to 2004. Todd Blessing
3/29/2005 Update or Other Action Discussed the status of a monitoring well on-site that is in need of repair and or decommissioning with Amber Mandt, the new environmental manager of ASIG sites. Todd Blessing
4/20/2005 Update or Other Action Approved of plan to decommission well OW-2. Todd Blessing
7/7/2005 Update or Other Action Reviewed and approved a Work Plan dated June 24, 2005 to conduct a site assessment. Within the work plan, URS Inc. proposes to sample groundwater from ten existing monitoring wells to be analyzed for petroleum constituents; evaluate the presence and thickness of petroleum product in site wells; evaluate the groundwater elevations to determine current groundwater flow direction; and treat investigative derived waste at responsible party's treatment facility. In addition, groundwater samples collected from wells MW-3, MW-5, and MW-7 will be analyzed for glycol and alcohol by EPA method 8015 (modified). Todd Blessing
11/4/2005 Update or Other Action Recently reviewed the site assessment report for Federal Express Vault Site, which was received by the Department on October 4, 2005. The site assessment report documented the July sampling and analysis of groundwater for petroleum constituents and alcohol based deicer fluids at the Federal Express Vault site. Groundwater elevations were evaluated from a majority of the monitor wells in order to determined the local groundwater flow direction. The following can be concluded following a review of the site assessment report: Groundwater elevation data at the time of sampling suggests that groundwater is generally flowing southwest; Free phase product is present in two monitor wells (MW-3, MW-5 and MW-7); The levels of dissolved phase petroleum constituents (i.e. GRO, DRO, and benzene) measured in 7 monitor wells exceed 18 AAC 75.345 Table C values; The extent of groundwater contamination has yet to be defined; and The presence of deicer fluid in groundwater may be contributing to the elevated levels of measured DRO Submited a letter to ASIG requesting that ASIG submit a letter to the Department that discusses the following issues: The treatment and disposal of investigative derived waste generated during the July 2005 groundwater monitoring event; Prevailing scientific literature or test data that supports or refutes the assertion that the presence of deicer fluids may contribute to elevated measurements of DRO; and The decommissioning of damaged monitoring wells Todd Blessing
5/8/2006 Update or Other Action Reviewed and approved of to decommission and replace all on-site monitor wells in support of taxiway improvement project at ANC. The well decommissioning plan was received by the Department on May 8, 2006. Under the plan, thirteen monitor wells will be decommissioned by filling the well casing and bore hole with bentonite slurry. The top five feet of the well bore hole will also be filled with clean structure material. Todd Blessing
7/10/2006 Update or Other Action Soil contaminated with jet fuel was discovered during the Taxiway U Reconstruction Project at the Anchorage International Airport. Approximately 3 cubic yards of contaminated soil was placed in ASIG's leased area to the north of the main access road. Todd Blessing
7/12/2006 Update or Other Action Rreviewed work plan to conduct a site investigation at the FEDEX Fuel Vault. Within the work plan, URS Inc. proposes to advance up to 12 soil borings in order to define the extent of hydrocarbon impacts to groundwater and vadose zone soil. Monitoring wells will be installed in eight of the soil borings. Groundwater samples collected following monitoring well installation and development will also be analyzed for petroleum constituents and de-icer compounds. At this time, the Department approves of the work plan as proposed by URS Inc. under the following conditions: Where applicable, the laboratory procedure for silica gel cleanup as defined in the Departments technical memorandum 06-001 (May 18, 2006), shall be followed; and Environmental laboratory data and quality assurance requirements as defined in the Departments technical memorandum 06-002 (May 18, 2006) shall be followed. The Department recommends that URS Inc. complete the laboratory data review checklist which can be found at following receipt of the analytical data. Todd Blessing
11/14/2006 Update or Other Action Reviewed Site Characterization dated October 2006. Nine soil borings were advanced in order to determine the present extent of contamination. Elevated levels of petroleum constituents were detected in soil samples collect from borings advanced in Taxiway U. DRO was detected up to a level of 7,790 mg/kg. Todd Blessing
3/23/2007 Exposure Tracking Model Ranking Initial 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
2/15/2011 Meeting or Teleconference Held DEC staff met with Amber Deem to discuss site status. Amber agreed to hire a contractor to construct a update conceptual site model to evaluate whether the site is a candidate for cleanup complete with institutional controls determination. Todd Blessing
6/28/2016 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 72987 name: Jet Fuel Darren Mulkey
6/30/2016 Report or Workplan Review - Other In preparation for the Decision Document, the Method Three & Cumulative Risk Calculator was applied to the data presented in the October 2006 Site Characterization Report - FedEx Vault AIA. The results are 6x10E-7 for Total Cancer Risk and 0.08 Total Hazard Index. Exposure pathways are from soil by Direct Contact and Outdoor Inhalation and are De Minimis due to the access is restricted, the site is currently paved, and any construction activities in the area that include soil excavation will be conducted in accordance with an ADEC approved work plan. Darren Mulkey
7/5/2016 Cleanup Complete Determination Issued A Cleanup Complete with Institutional Controls was issued on 7-5-16. Standard institutional controls associated with the Anchorage International Airport apply. The site was the location of a fuel spill in 1994. Free product was recovered until 1998. Since then the plume has diminished and or is remaining stable to within 60 ft. from the spill source. The site was paved over in 2006 as part of the Taxiway U expansion. Darren Mulkey
9/16/2016 Institutional Control Compliance Review IC compliance review conducted. Staff changed from Darren Mulkey to IC Unit. Information added to the Closure/IC Details. Closure documentation uploaded to the database. Reminder system set to follow-up on concrete cap inspections every five years. Kristin Thompson
10/26/2017 Institutional Control Update Contacted by DOT regarding a runway widening and maintenance project being planned for sometime in 2018. At this point DOT does not believe that they will be working right in the vicinity of the capped residual contamination. I suggested that they have a contingency workplan in place just in case they do run into contamination or if they end up working closer to this site boundaries than expected. I also provided the Managing Petroleum Contamination in Right-of-Way, Utility, or Maintenance Projects technical memo to use as a reference. Evonne Reese

Contaminant Information

Name Level Description Media Comments
DRO < Method 2 Most Stringent Soil Contaminants left in place: DRO @ 7790 mg/kg and benzene @ 0.0723 mg/kg.
GRO < Method 2 Most Stringent Soil Maximum GRO was 1140 mg/kg.

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.
Signed CS Determination


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.
Advance approval required to transport soil or groundwater off-site. Standard condition.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) Standard condition.
Maintenance / Inspection Of Engineering Controls The site is covered by a concrete cap which prevents exposure to contaminants in surface and subsurface soil and mitigates inhalation of contaminants in outdoor air. The concrete must be maintained as needed and inspected every five years.
Other ADOT&PF or their designee shall report to ADEC as soon as they become aware of any change in land ownership or use.
Excavation / Soil Movement Restrictions ADEC approval is required for any disturbance of soil at the site in areas having potential or documented contamination.

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