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Site Report: AIA Tanks #19, 20, 21

Site Name: AIA Tanks #19, 20, 21
Address: 5740 DeHavilland Avenue, Anchorage, AK 99501
File Number: 2100.26.596
Hazard ID: 26519
Status: Active
Staff: Wendy Hansen, 9072693059
Latitude: 61.180557
Longitude: -149.994460
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.


In November 2015 during a routine inspection of three underground storage tanks (USTs) at the Ted Stevens Anchorage International Airport (AIA) Airfield Maintenance Facility, a remote fill system was observed to be incorrectly installed and suspected releases were discovered. In 2005 the tanks were retrofitted for remote fill. To accommodate new piping, the spill buckets were removed, piping was not correctly installed, and caps on the fill risers were not tightly sealed. Surface soil analytical samples collected from the manholes (formerly access to the spill buckets) of the three tanks confirmed releases had occurred at all of the tanks. From north to south, Tank 19, a 15,000-gallon diesel tank, Tank 21, an 8,000-gallon gasoline tank, and Tank 20, another 15,000-gallon diesel tank had concentrations of diesel, benzene, and diesel, respectively, that exceeded migration to groundwater cleanup levels. The Airfield Maintenance Facility is in the Airside Risk Management Zone of TSAIA which is subject to an 18 AAC 75.350 determination prohibiting the use of groundwater as drinking water.

Action Information

Action Date Action Description DEC Staff
2/11/2016 Site Added to Database A new site has been added to the database Evonne Reese
2/11/2016 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area Tanks #19, 20, 21, 79877 Evonne Reese
2/11/2016 Report or Workplan Review - Other Shallow material in the manholes associated with the three tanks was field-screened and sampled for RRO, DRO, GRO, and BTEX. Analytical results indicated releases near the fill risers of each of the tanks. A sample collected from Tank 20 (15,000-gallon diesel tank), contained 4,410 mg/kg DRO. A sample collected from Tank 19 (15,000-gallon diesel tank), contained 2,760 mg/kg DRO. A sample collected from Tank 21 (8,000-gallon gasoline tank), contained 0.047 mg/kg benzene. Subsurface and groundwater samples were not collected. Lisa Krebs-Barsis
2/11/2016 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79877 name: Tanks #19, 20, 21 Lisa Krebs-Barsis
9/30/2016 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Administrative action addition for grant reporting purposes. Evonne Reese
6/22/2018 Update or Other Action A project was scheduled for 2018 to address these tanks at which time further site investigation was to be performed to determine extent of contamination. This project has been delayed a year. Staff requested that a work plan be submitted prior to conducting the site activities, and that screening and sampling be performed by a QEP. Wendy Hansen

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details


Description Details

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