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Site Report: AIA Ravn Alaska Aircraft Maintenance Facility


Site Name: AIA Ravn Alaska Aircraft Maintenance Facility
Address: 4700 Old International Airport Road; Anchorage International Airport, Anchorage, AK 99502
File Number: 2100.38.558
Hazard ID: 26474
Status: Active
Staff: Wendy Hansen, 9072693059 wendy.hansen@alaska.gov
Latitude: 61.172259
Longitude: -149.971226
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.

Problems/Comments

In October 2015 a leak was discovered from a valve on a mobile tank containing Jet-A fuel. The tank was used for de-fueling aircraft that were undergoing maintenance. The release occurred when the tank was parked on an unpaved portion of the site. An estimated 100 gallons of Jet-A fuel were released to the ground surface. Soil was excavated from the area during initial remediation activities and confirmation samples indicated diesel range organics remained in soil above DEC cleanup levels. Additionally, tetrachloroethene (PCE) and trichloroethene (TCE) were confirmed in soil above DEC cleanup levels. PCE and TCE were likely from a separate, yet unidentified source. Excavated soil was stockpiled and blended with other soil at the Alaska Soil Recycling yard and is awaiting thermal treatment.

Action Information

Action Date Action Description DEC Staff
11/30/2015 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PPR staff John Harry. Spill no. 15239929501; spill date = 10/22/15; substance AV gas / Jet A; quantity = ~100 gallons; source = mobile tank (bouser). Mitzi Read
12/2/2015 Site Added to Database A new site has been added to the database Mitzi Read
12/4/2015 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79839 name: AIA Ravn Alaska Aircraft Maintenance Facility Mitzi Read
12/31/2015 Potentially Responsible Party/State Interest Letter Lisa Krebs-Barsis
11/29/2016 Report or Workplan Review - Other Received a copy of the 1-8-16 Ravn Air spill investigation report from RSE. A total of 1022 tons of soil was excavated and taken to ASR for treatment. 30 samples were collected and analyzed for GRO, DRO, BTEX, PAHs, and VOCs. One sample, RV-3 contained DRO at 1930 mg/kg. All of the other samples were ND or below migration to groundwater cleanup levels for RRO, GRO, DRO and BTEX. All VOC samples except RV-24 (14.9 ug/kg) yielded PCE concentration greater than migration to groundwater cleanup levels. PCE results range between 28.3 to 2620 ug/kg. Samples RV-54 and RV-119 yielded concentrations of TCE of 30.6 ug/kg and 53.9 ug/kg respectively. The final excavation footprint exhibited concentrations of DRO, PCE, TCE, 1,1,2-Trichloroethane and 1,2-Dibromoethane greater than the ADEC Method 2 Cleanup Levels for migration to groundwater. DRO exceeded ADEC cleanup levels at two discrete sample location located along the fence line at the southeast excavation sidewall. PCE and TCE exceeded ADEC cleanup levels at several locations in the excavation and at the fence line and lease boundary. Only one sample exceeded ADEC cleanup levels for 1,1,2-Trichloroethane, and one for 1,2- Dibromoethane. Analytical method detection limits for 1,2-Dirbromoethane were noted to be above the ADEC Method 2 Soil Cleanup Levels in most of the VOC results for this compound. All other COPCs in soil remaining in place were either not detectable or were less than the ADEC Method 2 cleanup levels unless previously noted. All samples yielding PCE and TCE concentrations above ADEC Method 2 Cleanup Levels for Migration to Groundwater were less than ADEC Method 2 Cleanup levels for both Direct Contact and Outdoor Inhalation. The two samples yielding results 1,1,2-Trichloroethane and 1,2-Dibromoethane were also less than ADEC Method 2 Cleanup levels for both Direct Contact and Outdoor Inhalation (Table 3, Attachment B). Darren Mulkey
11/30/2016 Update or Other Action Sent request for a work plan to further delineate the site based on results from last report. Darren Mulkey
5/5/2017 Report or Workplan Review - Other Reviewed work plan for AIA Ravn Facility Jet-A spill site assessment. The objective of the site assessment is to determine if groundwater has been impacted as a result of the 2015 Jet A spill or the presence of chlorinated solvents detected in soil during spill cleanup activities. Three soil borings will be advanced to groundwater and completed as temporary monitoring wells. Soil samples will be collected for field screening at two foot intervals. The sample with the highest field screening results, the sample from the groundwater interface and/or samples to define the vertical extent of contamination will be submitted for laboratory analysis for DRO, GRO, VOCs with 10% of the sample also analyzed for PAHs. If groundwater impacts are suspected, permanent wells will be installed instead of temporary wells. Soil cuttings will be returned to the borehole, monitoring well development and purge water will be containerized pending analytical results. Bill O'Connell
8/31/2017 Report or Workplan Review - Other Reviewed 2017 Site Characterization Report, and provided comments. Three soil borings were advanced to groundwater and completed as temporary monitoring wells. Field screening and soil sample results indicated hydrocarbon impacts were generally limited to the upper 8 feet, with only low level detections at depth, 52-62 feet. Maximum concentrations of DRO, 1,2,4-trimethylbenzene, trichloroethene, 1-methylnapthalene, benzo(a) anthracene, and naphthalene exceeded Method 2 MTGW cleanup levels but were below human health. Concentrations of benzo (a) pyrene and dibenzo(a,h)anthracened were detected above both Method 2 MTGW and human health cleanup levels in the soil. No contaminates were detected in the groundwater above 18 AAC 75 Table C cleanup levels. Wendy Hansen

Contaminant Information

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