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Site Report: ERA Aviation Yakutat

Site Name: ERA Aviation Yakutat
Address: Yakutat Airport, Yakutat, AK 99689
File Number: 1530.38.008
Hazard ID: 3984
Status: Cleanup Complete
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 59.511770
Longitude: -139.668730
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

Historical petroleum releases discovered on the 100,000 square foot property: stained soil at the emergency generator fuel drum site next to the hanger was removed up to the building foundation and down to groundwater depth. Hydrant piping to the jet fuel AST was field screened for leakage; contaminated soil was removed from AST end and hydrant end of the piping and down to groundwater depth. Soil was analyzed for PAHs, GRO and DRO; DRO reached 13,000ppm at the south corner of the building where excavation was halted. Stained soil and distressed vegetation were observed as ten test pits were advanced in the Phase I SA; Phase II SA screened 50 cubic yard of soil that was stockpiled on-site and later transported and remediated off-site. Drinking water well located on the east side of the building was sampled 8/29/03 and analyzed for VOCs by EPA 524.2; no compounds were detected.

Action Information

Action Date Action Description DEC Staff
12/4/2003 Site Added to Database Historical Oil Spill. Transfer from PERP. Bruce Wanstall
12/15/2003 GIS Position Updated GPS using North American Datum 27 at airport frontage road. Bruce Wanstall
6/2/2004 Site Ranked Using the AHRM Site Assessment data, site inspection and knowledge of the area. Bruce Wanstall
6/7/2004 Update or Other Action File review. Request via email for Site Assessment final report from responsible party. Bruce Wanstall
6/29/2004 Update or Other Action Site Assessment Report review and discussion with RP consultant to obtain sample COC for lab data; groundwater monitoring will follow Phase II Site Characterization and Corrective Action. Bruce Wanstall
10/4/2004 Interim Removal Action Approved Fifty cubic yards of contaminated soil was excavated from 3 source areas on the property. Samples from the limits of excavation for DRO at the hanger foundation reached 2,480 mg/kg; at the former jet fuel AST DRO reached 417 mg/kg; and at the dispenser DRO concentrations were all below 230 mg/kg. Contaminated material was shipped and remediated off-site. Bruce Wanstall
10/15/2004 Site Characterization Report Approved Site Characterization Approval with request for groundwater assessement letter sent to RP; pdf version sent by email. Bruce Wanstall
11/3/2005 Update or Other Action Requested groundwater assessment and sampling of the on-site drinking water well; coordinating with consultant on driller schedule. Bruce Wanstall
7/19/2006 Update or Other Action Letter of interest requesting groundwater investigation sent to the responsible party via regular and email. Bruce Wanstall
8/24/2006 Site Characterization Workplan Approved Ground water assessment workplan approval sent by letter. Contaminated soil removal was completed from the surface to the capillary fringe of the vadose zone in three areas: the jet fuel above ground storage tank, the dispenser hydrant, and the emergency generator fuel storage tank. Contaminated soil removal at the generator tank site was limited also by the hanger foundation; diesel range hydrocarbon concentration data at that excavation sidewall reached 13, 000 mg/kg. Bruce Wanstall
4/12/2007 Exposure Tracking Model Ranking Initial ETM site ranking Bruce Wanstall
4/16/2007 Update or Other Action Data indicate that concentrations of DRO above the most conservative Method 2 cleanup level remain in soils at the site. The remaining DRO concentrations in soil were 2,400 mg/kg at the emergency generator drum storage excavation and 417 mg/kg at the jet fuel AST excavation. Further cleanup was determined to be impracticable near the former jet fuel AST, the emergency generator diesel drum, and the former dispenser hydrant because additional excavation of contaminated soil was submerged below the ground water table. Bruce Wanstall
4/18/2007 Site Characterization Report Approved The findings in the Release Investigation by Oasis in 2006 adequately demonstrate that residual petroleum contamination in the former source areas are of insufficient mass and concentration to cause an exceedance of regulatory benchmarks for groundwater. The ADEC finds that data in the release investigation are sufficient to support site closure with institutional controls placed on the property that restrict excavation and transport of material having residual petroleum contamination. Bruce Wanstall
4/19/2007 Update or Other Action Notice of Environmental Contamination: The remaining DRO concentrations in soil were 2,400 mg/kg at the emergency generator drum storage excavation and 417 mg/kg at the jet fuel AST excavation. Further excavation of impacted soil was limited by shallow groundwater. Bruce Wanstall
4/23/2007 Conditional Closure Approved The contaminant concentrations remaining on the ERA Yakutat Airport property were evaluated with regard to the potential exposure pathways and ADEC determined they do not pose an unacceptable risk to human health or the environment. The residual DRO remaining on site will attenuate over time and site management controls are established to ensure contamination will not impact ground water. Bruce Wanstall
4/23/2007 Institutional Control Record Established Any proposal to transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 75.325(i). Bruce Wanstall
4/24/2007 Long Term Monitoring Established ERA will submit for approval a monitoring plan to sample ground water again by June 1st 2010 to ensure that residual petroleum impacts to soil are not migrating in concentrations that exceed Table C cleanup levels Bruce Wanstall
10/29/2008 Long Term Monitoring Complete Updated ETM ranking: In 2006, four temporary monitoring wells downgradient from source areas were sampled and tested for BTEX, GRO, DRO and PAHs. Results for all analytes were below Table C screening levels; DRO was detected in test well-6 at 1.46 mg/L but may have been influenced by a utility conduit preferential pathway from a spill source. The findings in the Release Investigation by Oasis in 2006 adequately demonstrate that residual petroleum contamination in the former source areas are of insufficient mass and concentration to cause an exceedance of regulatory benchmarks for groundwater. Surface soil and migration to groundwater pathways are complete but the risk of exposure not unacceptable. Bruce Wanstall
4/1/2010 Update or Other Action Check Received $100.40 from Law 03/25/10 Traci Nebeker
3/7/2013 Institutional Control Record Removed The long term groundwater monitoring has been completed. This site meets the 2009 closure policy therefore ICs can be removed. The defaul requirement of any proposal to transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 75.325(i) will still apply. Evonne Reese

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby